Patent Publication Number: US-11649083-B2

Title: Bag-making and packaging apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Japanese Patent Application No. 2020-155622, filed Sep. 16, 2020. The contents of that application are incorporated by reference herein in their entirety. 
     TECHNICAL FIELD 
     This invention relates to a bag-making and packaging apparatus. 
     BACKGROUND ART 
     Conventionally, as disclosed in (JP-A No. 2008-127091, a bag-making and packaging apparatus is known which uses a bag-making and packaging unit to form into bags a sheet-like film drawn from a film feeding unit and produces bags filled with contents. 
     BRIEF SUMMARY 
     In the bag-making and packaging apparatus disclosed in JP-A No. 2008-127091, in a case where a malfunction occurs in at least one of a film feeding unit and a splicing device, it is conceivable that the bag-making operation will stop until the malfunctioning part is replaced. For this reason, in the bag-making and packaging apparatus pertaining to JP-A No. 2008-127091, there is the concern that productivity will be reduced until the malfunctioning part is replaced. 
     It is an object of this invention to provide a bag-making and packaging apparatus that can inhibit a reduction in productivity even in a case where a malfunction occurs in at least one of a film feeding unit and a splicing device. 
     A bag-making and packaging apparatus pertaining to a first aspect includes a bag-making and packaging unit, a film feeding unit, a splicing device, and a control unit. The bag-making and packaging unit forms a sheet-like film into a tubular shape. The bag-making and packaging unit seals the film that has been formed into the tubular shape to thereby form the film into bags. The film feeding unit has plural film roll holding units that hold film rolls in which the sheet-like film is wound. The film feeding unit feeds to the bag-making and packaging unit the film that is drawn from one film roll. The splicing device automatically splices together the film being fed from the film feeding unit and the film that is wound in another film roll. The control unit allows a bag-making operation to continue by utilizing an auto-feeding function that feeds to the bag-making and packaging unit the film spliced by the splicing device to take the place of the film currently being fed to the bag-making and packaging unit. When the control unit judges that at least one of the film feeding unit and the splicing device is malfunctioning in a case where the control unit is utilizing the auto-feeding function, the control unit stops the auto-feeding function and executes a non-auto-feeding mode. The non-auto-feeding mode allows the bag-making operation to be continued by the bag-making and packaging unit and the film roll holding unit that is operable among the plural film roll holding units. 
     According to this configuration, when the control unit judges that at least one of the film feeding unit and the splicing device is malfunctioning, the control unit stops the auto-feeding function and executes the non-auto-feeding mode. The non-auto-feeding mode allows the bag-making operation to be continued by the bag-making and packaging unit and the film roll holding unit that is operable among the plural film roll holding units. For this reason, in the bag-making and packaging apparatus pertaining to the first aspect, a reduction in productivity is inhibited even in a case where a malfunction occurs in at least one of the film feeding unit and the splicing device. 
     A bag-making and packaging apparatus pertaining to a second aspect is the bag-making and packaging apparatus of the first aspect, further including an operating mode switching unit. The operating mode switching unit at least receives an operation for switching the operating mode from an operator. 
     A bag-making and packaging apparatus pertaining to a third aspect is the bag-making and packaging apparatus of the first aspect or the second aspect, wherein when the control unit judges that at least one of the film feeding unit and the splicing device is malfunctioning in a case where the control unit is utilizing the auto-feeding function, the control unit stops the auto-feeding function and stops the operation of the bag-making and packaging unit. 
     According to this configuration, when the control unit judges that at least one of the film feeding unit and the splicing device is malfunctioning, the operation of the bag-making and packaging unit stops. For this reason, in the bag-making and packaging apparatus pertaining to the third aspect, the safety of the operator in a case where a malfunction occurs in at least one of the film feeding unit and the splicing device is ensured. 
     A bag-making and packaging apparatus pertaining to a fourth aspect is the bag-making and packaging apparatus pertaining to the third aspect, wherein when the control unit stops the operation of the bag-making and packaging unit, the control unit switches to the non-auto-feeding mode in a case where an operating mode switching unit that at least receives an operation for switching the operating mode from the operator has received an operation to switch to the non-auto-feeding mode. 
     According to this configuration, the switch to the non-auto-feeding mode is performed after the operation of the bag-making and packaging unit has stopped. For this reason, in the bag-making and packaging apparatus pertaining to the fourth aspect, the safety of the operator when switching the bag-making and packaging apparatus to the non-auto-feeding mode is ensured. 
     A bag-making and packaging apparatus pertaining to a fifth aspect is the bag-making and packaging apparatus pertaining to the third aspect or the fourth aspect, wherein when the control unit stops the operation of the bag-making and packaging unit, the control unit resumes the operation of the bag-making and packaging unit in a case where the path of the film fed to the bag-making and packaging unit has been changed from a first path to a second path. The first path is a path when utilizing the splicing device. The second path is a path different from the first path. 
     According to this configuration, the operation of the bag-making and packaging unit resumes after the path of the film has been changed. For this reason, in the bag-making and packaging apparatus pertaining to the fifth aspect, the safety of the operator when changing the path of the film in the bag-making and packaging apparatus is ensured. 
     A bag-making and packaging apparatus pertaining to a sixth aspect is the bag-making and packaging apparatus pertaining to any of the first aspect to the fifth aspect, wherein the film feeding unit includes a motor that rotates the film roll, a motor that rotates a frame that supports the film roll holding units, and a sensor that detect the posture of the frame that supports the film roll holding units. The splicing device includes at least one of a heater for applying heat to and thermocompressively bonding the film, a cutting member for cutting the film, and a pinch roller for conveying the film. 
     According to this configuration, when the control unit judges that the motor that rotate the film roll, the motor that rotates the frame that supports the film roll holding units, the sensor that detect the posture of the film roll holding units, the heater for applying heat to and thermocompressively bonding the film, the cutting member for cutting the film, and the pinch roller for conveying the film is malfunctioning, the control unit stops the auto-feeding function and executes the non-auto-feeding mode. In the bag-making and packaging apparatus pertaining to the sixth aspect, a reduction in productivity is inhibited. 
     In the bag-making and packaging apparatus pertaining to the invention, a reduction in productivity is inhibited even in a case where a malfunction occurs in at least one of the film feeding unit and the splicing device. 
     Furthermore, in the bag-making and packaging apparatus pertaining to the invention, the safety of the operator is ensured even in a case where a malfunction occurs in at least one of the film feeding unit and the splicing device. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is general perspective view of a combination weighing/bag-making and packaging system that includes a bag-making and packaging apparatus pertaining to an embodiment of the invention; 
         FIG.  2    is a general configuration diagram of the bag-making and packaging apparatus that the combination weighing/bag-making and packaging system of  FIG.  1    has; 
         FIG.  3    is a block diagram of the bag-making and packaging apparatus of  FIG.  2   ; 
         FIG.  4    is a drawing showing an example of a film used in the bag-making and packaging apparatus of  FIG.  2   ; 
         FIG.  5    is a general perspective view of a film feeding unit of the bag-making and packaging apparatus of  FIG.  2   ; 
         FIG.  6    is an enlarged perspective view around a holding mechanism support frame of the film feeding unit of  FIG.  5   ; 
         FIG.  7    is a sectional perspective view showing the internal structure of a frame shaft that rotatably supports the holding mechanism support frame of  FIG.  6   ; 
         FIG.  8    is an enlarged side view of main portions of the film feeding unit of  FIG.  5    in a state in which a first film roll has been attached to a first holding mechanism; 
         FIG.  9    is an enlarged side view of main portions of the film feeding unit of  FIG.  5    in a state in which the first holding mechanism has been moved to a film roll standby position; 
         FIG.  10    is a general plan view, around the frame shaft of the film feeding unit of  FIG.  5   , for describing the transmission of driving force with respect to the frame shaft, a first shaft, and a second shaft; 
         FIG.  11    is a drawing for describing a posture detection mechanism for detecting the posture of the holding mechanism support frame of  FIG.  6   ; 
         FIG.  12    is a flowchart for describing a flow until an operating mode is changed; 
         FIG.  13    is an example of a screen displayed on an operating mode switching unit; and 
         FIG.  14    is a drawing showing a second path of the film. 
     
    
    
     DETAILED DESCRIPTION 
     An embodiment of the bag-making and packaging apparatus pertaining to the invention is described below with reference to the drawings as appropriate. It will be noted that the following embodiment is a specific example of the invention, is not intended to limit the technical scope of the invention, and may be changed as appropriate to the extent that it does not depart from the spirit of the invention. 
     Furthermore, in the following description, expressions such as “front (front side),” “rear (back side),” “upper,” “lower,” “left,” and “right” are sometimes used to indicate directions and the like. Unless otherwise specified, “front (front side),” “rear (back side),” “upper,” “lower,” “left,” and “right” here follow the directions of the arrows added to the drawings. 
     (1) OVERALL CONFIGURATION 
       FIG.  1    is a general perspective view of a combination weighing/bag-making and packaging system  1  that includes a bag-making and packaging apparatus  1000  pertaining to an embodiment of the invention.  FIG.  2    is a general configuration diagram of the bag-making and packaging apparatus  1000 .  FIG.  3    is a block diagram of the bag-making and packaging apparatus  1000 .  FIG.  4    is a drawing showing an example of a film F used in the bag-making and packaging apparatus  1000 . 
     The combination weighing/bag-making and packaging system  1  includes a combination weighing apparatus  2000  and the bag-making and packaging apparatus  1000  (see  FIG.  1   ). 
     The bag-making and packaging apparatus  1000  is an apparatus that makes bags B containing articles C inside by manufacturing a bag-like packaging material from a sheet-like film F (see  FIG.  2   ). 
     The film F used here includes a printed surface Fa (see  FIG.  4   ), which is disposed on the outer surface side when the film F has been formed into the bags B, and a non-printed surface Fb, which is on the reverse side of the printed surface Fa. The printed surface Fa has printing P on it. The non-printed surface Fb does not have printing on it. The printing P is, for example, characters, illustrations, and photographs that are printed for the purpose of advertising and promoting the sale of the articles C as a product and providing information relating to the articles C. In addition to the printing P, registration marks M used to detect the position of the film F are also printed on the printed surface Fa. The articles C are fed from the combination weighing apparatus  2000  installed above the bag-making and packaging apparatus  1000  (see  FIG.  2   ). 
     Furthermore, as shown in  FIG.  1   , the bag-making and packaging apparatus  1000  includes a liquid crystal display  96 . The liquid crystal display  96  is attached to the front surface of the bag-making and packaging apparatus  1000  body. The liquid crystal display  96  is a touch panel display disposed in a position where an operator can see it. The liquid crystal display  96  functions as an input device that receives instructions for the bag-making and packaging apparatus  1000  and settings relating to the bag-making and packaging apparatus  1000 . The liquid crystal display  96  functions as an operating mode switching unit  96   a  that at least receives an operation for switching the operating mode from an operator. 
     The bag-making and packaging apparatus  1000  pertaining to this embodiment includes a control unit  300  that can allow a bag-making operation to continue by utilizing an auto-feeding function. The auto-feeding function is described later. The bag-making and packaging apparatus  1000  pertaining to this embodiment has, as operating modes, an auto-feeding mode that utilizes the auto-feeding function and a non-auto-feeding mode that does not utilize the auto-feeding function. The operating mode is switched, for example, by input using the liquid crystal display  96  functioning as the operating mode switching unit  96   a.    
     Below, for convenience of description, the operation of the bag-making and packaging apparatus  1000  in the auto-feeding mode is described. Consequently, unless otherwise specified, the operations of each part of the bag-making and packaging apparatus  1000  described below are operations in the auto-feeding mode. For this reason, the operations of each part in the non-auto-feeding mode are not limited to the following description. 
     The bag-making and packaging apparatus  1000  includes a bag-making and packaging unit  200 , a film feeding unit  100 , a splicing device  160 , and a control unit  300  (see  FIG.  2    and  FIG.  3   ). The control unit  300  controls the operations of the various constituent devices of the bag-making and packaging unit  200 , the film feeding unit  100 , and the splicing device  160 . The film feeding unit  100  has plural film roll holding units that hold film rolls FR in which the sheet-like film F is wound and feeds to the bag-making and packaging unit  200  the film F that is drawn from one film roll FR. The bag-making and packaging unit  200  forms the sheet-like film F into a tubular shape and seals the film Ft that has been formed into the tubular shape to thereby form the film Ft into bags. 
     The film feeding unit  100  mainly has, as mechanisms relating to the feeding of the film F, a first holding mechanism  110   a  and a second holding mechanism  110   b  (which correspond to the “film roll holding units” in the claims), a film drawing mechanism  116 , and a tension adjusting mechanism  180  (see  FIG.  2    and  FIG.  6   ). The holding mechanisms  110   a ,  110   b  hold the film rolls FR in which the sheet-like film F is wound (see  FIG.  2   ). Specifically, the first holding mechanism  110   a  has a shaft  111   a  on which a film roll FR is mounted and which rotatably holds the film roll FR mounted thereon (see  FIG.  6   ). The second holding mechanism  110   b  has a shaft  111   b  on which a film roll FR is mounted and which rotatably holds the film roll FR mounted thereon (see  FIG.  6   ). 
     It will be noted that the film rolls FR are rolls in which the sheet-like film F of  FIG.  4    is wound around a winding core (not shown in the drawings). The terminal end on the winding core side of the film F wound in the film roll FR is connected (secured) to the winding core by, for example, affixing it with tape not shown in the drawings to the winding core or adhering it with an adhesive or the like to the winding core. 
     The film drawing mechanism  116  is a mechanism that rotates the shafts (the first shaft  111   a  and the second shaft  111   b ) of the plural holding mechanisms (the first holding mechanism  110   a  and the second holding mechanism  110   b ) to thereby draw, respectively independently, the films F from the film rolls FR mounted on the shafts of the holding mechanisms. The film drawing mechanism  116  has a first holding mechanism motor  114   a  and a second holding mechanism motor  114   b  (which correspond to the “motors that rotate the film rolls” in the claims). The first holding mechanism motor  114   a  is a mechanism that rotates the shaft  111   a  to thereby draw the film from the film roll FR mounted on the shaft  111   a . The second holding mechanism motor  114   b  is a mechanism that rotates the shaft  111   b  to thereby draw the film from the film roll FR mounted on the shaft  111   b.    
     In this way, in this bag-making and packaging apparatus  1000 , the film F is not drawn using a single film drawing mechanism (e.g., a pinch roller disposed on the downstream side of the film rolls FR in the conveyance direction of the film F) but is drawn using the respectively independent holding mechanism motors  114   a ,  114   b  from the film rolls FR mounted on the shafts  111   a ,  111   b  of the plural holding mechanisms  110   a ,  110   b.    
     The splicing device  160  mainly has a heater  162 , a first clamp  163 , a second clamp  164 , a knife  166 , a pinch roller  168 , a trailing end portion position adjustment first sensor  152 , a trailing end portion position adjustment second sensor  154 , and a cooling air electromagnetic valve  161   a  (see  FIG.  9   ). The splicing device  160  is used mainly for detecting that the film F of the film roll FR (for convenience of description, hereinafter sometimes called the used film roll FR) that one of the holding mechanisms  110   a ,  110   b  holds has been used up, adjusting the position of the trailing end portion of the film F of the used film roll FR to an appropriate position, and splicing the trailing end portion of the film F of the used film roll FR to the film F of the film roll FR (for convenience of description, hereinafter sometimes called the replacement film roll FR) that the other of the holding mechanisms  110   a ,  110   b  holds. 
     The bag-making and packaging unit  200  mainly has a former unit  210 , which has a former body  212  and a tube  214 , film conveyor belts  220 , a longitudinal sealing mechanism  230 , and a transverse sealing mechanism  240  (see  FIG.  2   ). 
     The bag-making and packaging apparatus  1000  performs a bag-making and packaging operation generally by the following flow as a result of the operations of the various constituent devices of the bag-making and packaging unit  200  and the film feeding unit  100  being controlled by the control unit  300 . 
     The sheet-like film F is fed to the bag-making and packaging unit  200  from the film roll FR that one of the two holding mechanisms  110   a ,  110   b  of the film feeding unit  100  holds. In a case where the sheet-like film F is fed from the film roll FR mounted on the first shaft  111   a  of the first holding mechanism  110   a , the film F is drawn by the first holding mechanism motor  114   a . In a case where the sheet-like film F is fed from the film roll FR mounted on the second shaft  111   b  of the second holding mechanism  110   b , the film F is drawn by the second holding mechanism motor  114   b . The sheet-like film F that has been pulled out from the film roll FR is conveyed by the film conveyor belts  220  of the bag-making and packaging unit  200  to the bag-making and packaging unit  200 . The sheet-like film F that is conveyed to the bag-making and packaging unit  200  is guided by plural rollers  170  including movable rollers  185  and fixed rollers  182  of the tension adjusting mechanism  180  described later and is conveyed to the former body  212  of the former unit  210 . The tension adjusting mechanism  180  uses the movable rollers  185  to apply force to the film F and adjust the tension in the film F that is conveyed. The former body  212  forms the sheet-like film F into a tubular shape to thereby form the tubular film Ft. The tubular film Ft is conveyed downward by the film conveyor belts  220 , and an overlapping portion of the tubular film Ft is sealed in the longitudinal direction by the longitudinal sealing mechanism  230  disposed under the former body  212 . The tubular film Ft that has been sealed in the longitudinal direction (the film conveyance direction) by the longitudinal sealing mechanism  230  is conveyed further downward by the film conveyor belts  220  and is sealed in a direction intersecting (in particular, here, a direction orthogonal to) the conveyance direction of the tubular film Ft by the transverse sealing mechanism  240  disposed under the longitudinal sealing mechanism  230 . Moreover, the transverse sealing mechanism  240  also cuts, in the transverse direction, the transversely sealed portion of the tubular film Ft at its middle portion in the conveyance direction of the tubular film Ft to thereby make the bags B whose upper and lower ends are sealed. It will be noted that before the tubular film Ft is sealed by the transverse sealing mechanism  240 , the articles C are fed through the tube  214  of the former unit  210  to the inside of the tubular film Ft that becomes the bags B. As a result, in the bag-making and packaging apparatus  1000 , the bags B containing the articles C are made. The bags B containing the articles C and made by the bag-making and packaging apparatus  1000  are conveyed to a downstream process by, for example, a conveyor (not shown in the drawings) disposed under the transverse sealing mechanism  240 . 
     (2) DETAILED CONFIGURATION 
     The bag-making and packaging unit  200 , the film feeding unit  100 , the splicing device  160 , and the control unit  300  of the bag-making and packaging apparatus  1000  will now be described in greater detail. 
     (2-1) Bag-Making and Packaging Unit 
     The former unit  210 , the film conveyor belts  220 , the longitudinal sealing mechanism  230 , and the transverse sealing mechanism  240  of the bag-making and packaging unit  200  will now be described. 
     The former unit  210  mainly has the former body  212  and the tube  214  (see  FIG.  2   ). 
     The former body  212  is disposed surrounding the open cylinder-shaped tube  214  in its circumferential direction. The former body  212  forms into a tubular shape the sheet-like film F pulled out from the film roll FR and conveyed to the former body  212  by folding the film F so that the left end portion and the right end portion of the film F overlap each other. 
     The tube  214  is an open cylinder-shaped member that extends in the vertical direction and whose upper and lower end portions are open. The tube  214  accepts, through the opening in its upper portion, the articles C that drop thereto (see  FIG.  2   ). The articles C that have been input through the opening in the upper portion of the tube  214  pass through the inside of the tube  214  and are fed through the opening in the lower portion of the tube  214  to the inside of the tubular film Ft. 
     The bag-making and packaging unit  200  has a pair of the film conveyor belts  220  (see  FIG.  2   ). The pair of film conveyor belts  220  convey to the former body  212  the film F that is pulled out from the film roll FR. Furthermore, the film conveyor belts  220  convey to the transverse sealing mechanism  240  the tubular film Ft that has been formed by the former body  212 . 
     The longitudinal sealing mechanism  230  (see  FIG.  2   ) is a mechanism that longitudinally seals (seals in the up and down direction) the overlapping portion of the tubular film Ft wrapped around the tube  214 . 
     The longitudinal sealing mechanism  230  has a heater (not shown in the drawings), a heater belt (not shown in the drawings) that contacts the overlapping portion of the tubular film Ft, and a drive mechanism (not shown in the drawings) that drives the heater belt. The longitudinal sealing mechanism  230  heat-seals, in the longitudinal direction, the overlapping portion of the tubular film Ft by applying the heated heater belt to the overlapping portion of the tubular film Ft to thereby press, with a predetermined pressure, the overlapping portion of the tubular film Ft against the tube  214 . 
     The transverse sealing mechanism  240  is a mechanism that transversely seals the tubular film Ft conveyed downward by the film conveyor belts  220  after the tubular film Ft has been longitudinally sealed by the longitudinal sealing mechanism  230 . 
     The transverse sealing mechanism  240  has a pair of rotating bodies  242  that are disposed in front and in back of the tubular film Ft (see  FIG.  2   ). Attached to each rotating body  242  are a sealing jaw  244   a  and a sealing jaw  244   b  that have built-in heaters (see  FIG.  2   ). The pair of sealing jaws  244   a  pinch the tubular film Ft in a state in which they press against each other, apply pressure and heat to the part of the tubular film Ft that becomes the upper and lower end portions of the bags B, and transversely seal the tubular film Ft. A cutter not shown in the drawings is built into one of the sealing jaws  244   a . The cutter cuts the transversely sealed portion of the tubular film Ft at its middle position in the conveyance direction of the tubular film Ft to thereby cut apart the bag B and the subsequent tubular film Ft. 
     The transverse sealing of the tubular film Ft and the cutting of the tubular film Ft by the sealing jaws  244   b  are the same as those performed by the sealing jaws  244   a , so description thereof is omitted. 
     (2-2) Film Feeding Unit 
     The film feeding unit  100  will now be described with reference to more drawings. 
       FIG.  5    is a general perspective view of the film feeding unit  100 .  FIG.  6    is an enlarged perspective view around a holding mechanism support frame  120  of the film feeding unit  100 .  FIG.  7    is a sectional perspective view showing the internal structure of a frame shaft  130  that rotatably supports the holding mechanism support frame  120 .  FIG.  8    is an enlarged side view of main portions of the film feeding unit  100  in a state in which the film rolls FR have been attached to the first holding mechanism  110   a  and the second holding mechanism  110   b .  FIG.  9    is an enlarged side view of main portions of the film feeding unit  100  in a state in which the first holding mechanism  110   a  has been moved to a film roll standby position A 3 .  FIG.  10    is a general plan view, around the frame shaft  130  of the film feeding unit  100 , for describing the transmission of driving force with respect to the frame shaft  130 , the first shaft  111   a , and the second shaft  111   b.    
     The film feeding unit  100  is a unit that feeds to the bag-making and packaging unit  200  the film F wound in the film rolls FR. In the film feeding unit  100 , the film F is guided to the bag-making and packaging unit  200  by the plural rollers  170  that are disposed along a conveyance path of the film F. The rollers  170  include the fixed rollers  182  and the movable rollers  185  of the tension adjusting mechanism  180 . 
     The film feeding unit  100  has the tension adjusting mechanism  180  that adjusts the tension that acts on the film F that is conveyed. Furthermore, the film feeding unit  100  has the first holding mechanism  110   a  and the second holding mechanism  110   b , a holding mechanism support frame  120  (which corresponds to the “frame that supports the film roll holding units” in the claims), a frame shaft  130 , a moving mechanism  139 , and the film drawing mechanism  116 . Furthermore, the film feeding unit  100  has a leading end portion position adjusting mechanism  140 . 
     The leading end portion position adjusting mechanism  140  mainly includes a leading end portion position adjustment sensor  142 , a film temporary placement member  143 , a temporary restraining mechanism  144 , and a terminal end position adjustment air nozzle  146 . The leading end portion position adjusting mechanism  140  is used mainly for adjusting the position of the leading end portion of the film F wound in the film roll FR and the neighboring portion of the terminal end of the film F when a new film roll FR for replacement has been mounted on the first holding mechanism  110   a  or the second holding mechanism  110   b.    
     It will be noted that, here, the leading end portion, the trailing end portion, and the terminal end of the film F are defined as follows. 
     First, in defining these terms, a case is supposed where the film F of the film roll FR (for convenience of description, hereinafter sometimes called the used film roll FR) that one of the first holding mechanism  110   a  and the second holding mechanism  110   b  holds is used up and the film F of the film roll FR (for convenience of description, hereinafter sometimes called the replacement film roll FR) that the other of the first holding mechanism  110   a  and the second holding mechanism  110   b  holds becomes spliced to the film F of the used film roll FR by a later-described heater  162 . 
     The portion of the film F of the replacement film roll FR that becomes spliced to the film F of the used film roll FR at this time is called the leading end portion of the film F. Furthermore, the portion of the film F of the used film roll FR that becomes spliced to the leading end portion of the film F of the replacement film roll FR is called the trailing end portion of the film F. Furthermore, the terminal end of the film F here means the end on the pull-out side (the opposite side of the side connected to the winding core not shown in the drawings) of the film F wound in the replacement film roll FR. For example, using  FIG.  8    and  FIG.  9    as an example, the portion denoted by reference sign F 1 L is the leading end portion of the film F (of the replacement film roll FR), the portion denoted by reference sign F 2 T is the trailing end portion of the film F (of the used film roll FR), and the portion denoted by reference sign F 1 E is the terminal end of the film F (of the replacement film roll FR). 
     It will be noted that in the following description there are cases where, in addition to the above expressions, the expression “detects the trailing end of the film roll FR” is used. “Detects the trailing end of the film roll FR” means detecting a state in which all the film F wound in the film roll FR has been pulled out from the film roll FR. 
     Below, the devices, mechanisms, and members of the film feeding unit  100  are described. 
     It will be noted that the film rolls FR that the holding mechanisms  110   a ,  110   b  hold are the same type of film roll in which the same type of sheet-like film F is wound. However, below, for convenience of description, there are cases where the film roll that the first holding mechanism  110   a  holds is called a first film roll FR 1  in which a sheet-like first film F 1  is wound. Furthermore, there are cases where the film roll that the second holding mechanism  110   b  holds is called a second film roll FR 2  in which a second film F 2  is wound. 
     (2-2-1) Holding Mechanisms 
     The first holding mechanism  110   a  and the second holding mechanism  110   b  are mechanisms that hold the film rolls FR (the first film roll FR 1  and the second film roll FR 2 ) in which the sheet-like films F (the first film F 1  and the second film F 2 ) are wound around hollow winding cores (not shown in the drawings) (see  FIG.  6   ). 
     The first holding mechanism  110   a  has the first shaft  111   a  on which the first film roll FR 1  is mounted and which rotatably holds the first film roll FR 1  mounted thereon (see  FIG.  6   ). The first shaft  111   a  is a cantilever shaft having one end supported on the holding mechanism support frame  120  side. When a connection mechanism  111   a   1  (e.g., an air chuck) is driven in a state in which the first shaft  111   a  has been inserted through the hollow winding core of the first film roll FR 1 , the first film roll FR 1  becomes secured to the first shaft  111   a  (see  FIG.  6   ). When the first shaft  111   a  is rotated by the first holding mechanism motor  114   a  in this state, the first film roll FR 1  rotates together with the first shaft  111   a.    
     It is preferred that the first holding mechanism  110   a  has a first guide member  119  that guides the first film F 1  so that the first film F 1  is disposed along a predetermined path when performing positional adjustment of the leading end portion F 1 L of the first film F 1  wound in the first film roll FR 1  after the first film roll FR 1  has been mounted on the first shaft  111   a  (see  FIG.  8   ). Furthermore, it is preferred that the first holding mechanism  110   a  has a first film restraining mechanism  117  that restrains the first film F 1  until the leading end portion F 1 L of the first film F 1  and the trailing end portion F 2 T of the second film F 2  become spliced together when the first film roll FR 1  has been attached to the first shaft  111   a  and the leading end portion F 1 L of the first film F 1  wound in the first film roll FR 1  has been aligned with a prescribed position (the position where the leading end portion F 1 L should be disposed) in a way described later (see  FIG.  8   ). The first film restraining mechanism  117  includes fixed rollers  112  and an air cylinder  118   a  that has a movable roller  118  attached to the distal end of a rod (see  FIG.  8   ). When the air cylinder  118   a  is driven and the movable roller  118  is pushed against the fixed rollers  112 , the first film F 1  disposed between the movable roller  118  and the fixed rollers  112  becomes restrained between the movable roller  118  and the fixed rollers  112  (in particular, a fixed roller  112   a  disposed in the middle among three rollers disposed side by side in the state shown in  FIG.  8   ). The first guide member  119 , the fixed rollers  112 , and the air cylinder  118   a  are attached to an arm  122   a  that extends from the holding mechanism support frame  120  (see  FIG.  8   ). 
     The second holding mechanism  110   b  has the second shaft  111   b  on which the second film roll FR 2  is mounted and which rotatably holds the second film roll FR 2  mounted thereon (see  FIG.  6   ). The second shaft  111   b  is a cantilever shaft having one end supported on the holding mechanism support frame  120  side. When a connection mechanism  111   b   1  (e.g., an air chuck) is driven in a state in which the second shaft  111   b  has been inserted through the hollow winding core of the second film roll FR 2 , the second film roll FR 2  becomes secured to the second shaft  111   b  (see  FIG.  6   ). When the second shaft  111   b  is rotated by the second holding mechanism motor  114   b  in this state, the second film roll FR 2  rotates together with the second shaft  111   b.    
     Furthermore, although detailed description is omitted for the sake of simplifying description, it is preferred that the second holding mechanism  110   b  also has a second guide member and a second film restraining mechanism (not shown in the drawings) having the same structures and functions as the first guide member  119  and the first film restraining mechanism  117 . 
     (2-2-2) Tension Adjusting Mechanism 
     The tension adjusting mechanism  180  is a mechanism that adjusts the magnitude of the tension that acts on the film F that is conveyed. The tension adjusting mechanism  180  mainly has the three fixed rollers  182 , a movable roller mechanism  184 , a shaft  184   a , a movable roller mechanism air cylinder  187 , and an encoder  188  (see  FIG.  3    and  FIG.  8   ). The movable roller mechanism  184  has the two movable rollers  185  and a pair of arms  186  (see  FIG.  8   ). The arms  186  are members that support the two movable rollers  185 . The pair of arms  186  are disposed on the left side and the right side of the movable rollers  185 , so as to sandwich the movable rollers  185  that extend in the right and left direction, and support the end portions of the movable rollers  185 . The arms  186  are rotatably supported by the shaft  184   a  that extends in the right and left direction. The movable roller mechanism air cylinder  187  has a rod (not shown in the drawings) whose distal end is connected to an arm (not shown in the drawings) that extends in the radial direction from the shaft  184   a . When the movable roller mechanism air cylinder  187  is driven, a force that causes the shaft  184   a  to rotate is generated. 
     The fixed rollers  182  and the movable rollers  185  are disposed on the conveyance path of the film F that is drawn from the film roll FR. The fixed rollers  182  and the movable rollers  185  are disposed between the film roll FR and the former body  212  in the conveyance direction of the film F (see  FIG.  2   ). The fixed rollers  182  and the movable rollers  185  are all freely rotatable rollers. The fixed rollers  182  and the movable rollers  185  all extend in the right and left direction. The fixed rollers  182  are secured to a frame (not shown in the drawings) of the bag-making and packaging apparatus  1000 , and their position does not change. In contrast, the movable rollers  185  are secured to the arms  186  that are rotatable about the axial center of the shaft  184   a  as described above, so their position is changed (i.e., movable) by the movement of the arms  186 . 
     The fixed rollers  182  and the movable rollers  185  contact the film F conveyed thereto from the film roll FR and guide the film F. The film F is entrained about the fixed rollers  182  and the movable rollers  185  so that when the film F is conveyed from the film roll FR the film F sequentially contacts, from the upstream side, a fixed roller  182 , a movable roller  185 , a fixed roller  182 , a movable roller  185 , and a fixed roller  182  (see  FIG.  8   ). The film F is entrained about the fixed rollers  182  and the movable rollers  185  in such a way that the fixed rollers  182  contact the lower surface (the printed surface Fa) of the film F that is conveyed and the movable rollers  185  contact the upper surface (the non-printed surface Fb) of the film F that is conveyed (see  FIG.  8   ). 
     The movable rollers  185  that contact the upper surface of the film F conveyed thereto push the film F downward because of the resultant force of the self-weight of the movable roller mechanism  184  and the force that the movable roller mechanism air cylinder  187  produces to cause the shaft  184   a  to rotate. As a result, the movable rollers  185  cause tension to act on the film F. It will be noted that by controlling the operation of the movable roller mechanism air cylinder  187 , the force with which the movable rollers  185  push the film F downward changes and the tension that acts on the film F changes. 
     It will be noted that the encoder  188  (see  FIG.  3   ) for detecting the angle of rotation of the shaft  184   a  is attached to one end of the shaft  184   a . The detection result of the encoder  188  is used in control of the position of the movable rollers  185  by the control unit  300  described later. Furthermore, the detection result of the encoder  188  can also be utilized in detection of the trailing end of the film roll FR by the control unit  300  described later. 
     (2-2-3) Holding Mechanism Support Frame 
     In this embodiment, the holding mechanism support frame  120  supports the first holding mechanism  110   a  and the second holding mechanism  110   b . In particular, the holding mechanism support frame  120  rotatably supports the first shaft  111   a  of the first holding mechanism  110   a  and rotatably supports the second shaft  111   b  of the second holding mechanism  110   b.    
     Furthermore, from the holding mechanism support frame  120  extend the arm  122   a  and an arm  122   b . Attached to the arm  122   a  are the first guide member  119  and the fixed rollers  112  and the air cylinder  118   a  of the first film restraining mechanism  117  that the first holding mechanism  110   a  has. Attached to the arm  122   b  are the second guide member and the fixed rollers and the air cylinder of the second film restraining mechanism (not shown in the drawings). The second guide member and the second film restraining mechanism of the second holding mechanism  110   b  have the same structures and functions as the first guide member  119  and the first film restraining mechanism  117  of the first holding mechanism  110   a  except that they are for the second holding mechanism  110   b.    
     (2-2-4) Frame Shaft 
     The frame shaft  130  is a shaft that rotatably supports the holding mechanism support frame  120 . 
     When the holding mechanism support frame  120  rotates about the central axis of the frame shaft  130 , the first shaft  111   a  of the first holding mechanism  110   a  and the second shaft  111   b  of the second holding mechanism  110   b  also rotate about the central axis of the frame shaft  130 . Furthermore, when the holding mechanism support frame  120  rotates about the central axis of the frame shaft  130 , the arm  122   a  and the arm  122   b  of the holding mechanism support frame  120  also rotate about the central axis of the frame shaft  130 . 
     The frame shaft  130  has a multilayer shaft structure. Here, the frame shaft  130  has a three-layer shaft structure. The frame shaft  130  includes a first layer shaft  132  that is disposed as the outermost layer and is the largest in diameter, a third layer shaft  136  that is disposed as the innermost layer and is the smallest in diameter, and a second layer shaft  134  that is disposed between the first layer shaft  132  and the third layer shaft  136  (see  FIG.  7   ). The first layer shaft  132 , the second layer shaft  134 , and the third layer shaft  136  can rotate respectively independently. 
     The first layer shaft  132  is a shaft for rotating the holding mechanism support frame  120 . One end of the first layer shaft  132  is secured to the holding mechanism support frame  120 . When the first layer shaft  132  is rotated by the moving mechanism  139  as described later, the holding mechanism support frame  120  rotates. 
     The second layer shaft  134  is a shaft for rotating the first shaft  111   a  of the first holding mechanism  110   a . When the second layer shaft  134  is rotated by the film drawing mechanism  116  as described later, the first shaft  111   a  of the first holding mechanism  110   a  rotates. Specifically, when the second layer shaft  134  is rotated by the first holding mechanism motor  114   a  of the film drawing mechanism  116 , the first shaft  111   a  of the first holding mechanism  110   a  is rotated and the first film F 1  is drawn from the first film roll FR 1  mounted on the first shaft  111   a.    
     The third layer shaft  136  is a shaft for rotating the second shaft  111   b  of the second holding mechanism  110   b . When the third layer shaft  136  is rotated by the film drawing mechanism  116  as described later, the second shaft  111   b  of the second holding mechanism  110   b  rotates. Specifically, when the third layer shaft  136  is rotated by the second holding mechanism motor  114   b  of the film drawing mechanism  116 , the second shaft  111   b  of the second holding mechanism  110   b  is rotated and the second film F 2  is drawn from the second film roll FR 2  mounted on the second shaft  111   b.    
     (2-2-5) Moving Mechanism 
     The moving mechanism  139  rotates the holding mechanism support frame  120  to thereby move the first holding mechanism  110   a  and the second holding mechanism  110   b  between at least a film roll setting position A 1  and a film feeding position A 2 . Preferably, the moving mechanism  139  also rotates the holding mechanism support frame  120  to thereby move one of the first holding mechanism  110   a  and the second holding mechanism  110   b  to a film roll standby position A 3  and move the other of the first holding mechanism  110   a  and the second holding mechanism  110   b  to a film feeding position A 4 . It will be noted that the film roll setting position A 1  of the first holding mechanism  110   a  and the second holding mechanism  110   b  is the position where the first holding mechanism  110   a  is disposed in  FIG.  8   . The film feeding position A 2  of the first holding mechanism  110   a  and the second holding mechanism  110   b  is the position where the second holding mechanism  110   b  is disposed in  FIG.  8   . The film roll standby position A 3  of the first holding mechanism  110   a  and the second holding mechanism  110   b  is the position where the first holding mechanism  110   a  is disposed in  FIG.  2    and  FIG.  9   . The film feeding position A 4  of the first holding mechanism  110   a  and the second holding mechanism  110   b  is the position where the second holding mechanism  110   b  is disposed in  FIG.  2   . The film roll standby position A 3  is a position rotated a predetermined angle (e.g., 45°) counter-clockwise from the film roll setting position A 1  about the central axis of the frame shaft  130  as seen in a right side view. Furthermore, although this is not intended to be limiting, the film feeding position A 2  is a position rotated a predetermined angle (e.g., 135°) counter-clockwise from the film roll standby position A 3  about the central axis of the frame shaft  130  as seen in a right side view. Furthermore, the film feeding position A 4  is a position rotated a predetermined angle (e.g., 45°) counter-clockwise from the film feeding position A 2  about the central axis of the frame shaft  130  as seen in a right side view. 
     The film roll setting position A 1  is a position where the film roll FR becomes mounted on the first shaft  111   a  of the first holding mechanism  110   a  and the second shaft  111   b  of the second holding mechanism  110   b . That is, in this bag-making and packaging apparatus  1000 , the film roll FR is mounted on the shafts  111   a ,  111   b  in the same position both with respect to the first holding mechanism  110   a  and with respect to the second holding mechanism  110   b.    
     The film feeding positions A 2 , A 4  are positions where the film F fed to the bag-making and packaging unit  200  is drawn from the film roll FR mounted on the shafts  111   a ,  111   b  at the time of the bag-making and packaging operation of the bag-making and packaging apparatus  1000 . That is, one of the holding mechanisms  110   a ,  110   b  holding the film roll FR that feeds the film F to the bag-making and packaging unit  200  is disposed mainly in one of the film feeding position A 2  and the film feeding position A 4  when the bag-making and packaging operation is performed by the bag-making and packaging unit  200 . 
     The film roll standby position A 3  is a position where the first holding mechanism  110   a  on whose first shaft  111   a  the first film roll FR 1  was mounted in the film roll setting position A 1  stands by until the second film F 2  of the second film roll FR 2  that the second holding mechanism  110   b  is holding is used up. Furthermore, the film roll standby position A 3  is a position where the second holding mechanism  110   b  on whose second shaft  111   b  the second film roll FR 2  was mounted in the film roll setting position A 1  stands by until the first film F 1  of the first film roll FR 1  that the first holding mechanism  110   a  is holding is used up. 
     When the first holding mechanism  110   a  has been moved to the film roll standby position A 3 , the leading end portion F 1 L of the first film F 1  is moved to a position (called a splicing position) where it becomes spliced by the heater  162  to the trailing end portion F 2 T of the second film F 2 . Likewise, when the second holding mechanism  110   b  has been moved to the film roll standby position A 3 , the leading end portion of the second film F 2  is moved to the position (the splicing position) where it becomes spliced by the heater  162  to the trailing end portion of the first film F 1 . 
     The structure of the moving mechanism  139  will now be described. 
     The moving mechanism  139  mainly includes a frame rotation motor  138  (which corresponds to the “motor that rotates a frame that supports the film roll holding units” in the claims) and a frame rotation transmission mechanism  137 . The frame rotation motor  138  is a motor for rotating the holding mechanism support frame  120 . The frame rotation transmission mechanism  137  is a mechanism that transmits the driving force of the frame rotation motor  138  to the first layer shaft  132  of the frame shaft  130 . 
     The frame rotation transmission mechanism  137  includes a belt  137   a , a drive roller  137   b , and a follower roller  137   c . The belt  137   a  is entrained about the drive roller  137   b  and the follower roller  137   c . The drive roller  137   b  is connected to the frame rotation motor  138  and is driven by the frame rotation motor  138 . The follower roller  137   c  is connected to one end of the first layer shaft  132  of the frame shaft  130  (the end portion of the first layer shaft  132  on the side not connected to the holding mechanism support frame  120 ). When the frame rotation motor  138  is driven, the drive roller  137   b  rotates, the follower roller  137   c  rotates via the belt  137   a , and the first layer shaft  132  also rotates. Additionally, as a result of the first layer shaft  132  rotating, the holding mechanism support frame  120  is rotated and the first holding mechanism  110   a  and the second holding mechanism  110   b  are moved. 
     It will be noted that detection of the posture of the holding mechanism support frame  120  that has been rotated by the moving mechanism  139  can be realized inexpensively by, for example, a mechanism  400  such as described below. 
     As shown in  FIG.  11   , the mechanism  400  for detecting the posture of the holding mechanism support frame  120  has a first member  402 , a second member  404 , and a third member  406 , which are secured to an end portion of the first layer shaft  132  (which rotate together with the first layer shaft  132 ), and two photoelectric sensors  408 A,  408 B (which correspond to the “sensors that detect the posture of the frame that supports the film roll holding units” in the claims). The first member  402  is a plate formed in the shape of a fan with a radius R1 centered on a rotational axis O of the first layer shaft  132  when the end portion of the first layer shaft  132  to which the first member  402  is attached is seen from the side. The second member  404  is a plate having a shape such as in  FIG.  11    in which its outer peripheral side is defined by a circular arc with a radius R2 (&gt;R1) centered on the rotational axis O of the first layer shaft  132 , its inner peripheral side is defined by a circular arc with a radius R1 centered on the rotational axis O of the first layer shaft  132 , and these circular arcs are interconnected by two straight lines extending in the radial direction with respect to the rotational axis O when the end portion of the first layer shaft  132  to which the second member  404  is attached is seen from the side. The third member  406  is a plate formed in the shape of a fan with a radius R2 centered on the rotational axis O of the first layer shaft  132  when the end portion of the first layer shaft  132  to which the third member  406  is attached is seen from the side. The photoelectric sensor  408 A detects whether or not the first member  402  and the third member  406  are present in a position located a distance K1 (K1&lt;R1) from the rotational center O when the end portion of the first layer shaft  132  to which the first member  402  is attached is seen from the side. The photoelectric sensor  408 B is disposed on a straight line joining the rotational center O and the photoelectric sensor  408 A and detects whether or not the second member  404  and the third member  406  are present in a position located a distance K2 (R1&lt;K2&lt;R2) away from the rotational center O when the end portion of the first layer shaft  132  to which the first member  402  is attached is seen from the side. The positions of the two photoelectric sensors  408 A,  408 B are constant regardless of the rotation of the first layer shaft  132 . 
     The first member  402 , the second member  404 , and the third member  406  are disposed in such a way that when detection of the members  402 ,  404 ,  406  has been performed using the two photoelectric sensors  408 A,  408 B as in  FIG.  11   , depending on the angle of rotation of the first layer shaft  132  there arises a state in which just one of the two photoelectric sensors  408 A,  408 B is detecting a member, a state in which both of the two photoelectric sensors  408 A,  408 B are detecting a member, or a state in which neither of the two photoelectric sensors  408 A,  408 B is detecting a member. Additionally, by utilizing combinations of the detection results of the two photoelectric sensors  408 A,  408 B, the rough angle of rotation of the first layer shaft  132 , and therefore the posture of the holding mechanism support frame  120 , can be detected. 
     (2-2-6) Film Drawing Mechanism 
     The film drawing mechanism  116  rotates the shafts (the first shaft  111   a  and the second shaft  111   b ) of the plural holding mechanisms (the first holding mechanism  110   a  and the second holding mechanism  110   b ) to thereby draw, respectively independently, the film (the first film F 1  and the second film F 2 ) from the film rolls (the first film roll FR 1  and the second film roll FR 2 ) mounted on the shafts of the plural holding mechanisms. The film drawing mechanism  116  is configured to be capable of changing the drawing speed of the first film roll FR 1  and the second film roll FR 2  at the time of the bag-making and packaging operation in the bag-making and packaging unit  200 . 
     The film drawing mechanism  116  includes the first holding mechanism motor  114   a , the second holding mechanism motor  114   b , a first transmission mechanism  115   a , a second transmission mechanism  115   b , a third transmission mechanism  115   c , and a fourth transmission mechanism  115   d.    
     The first holding mechanism motor  114   a  rotates the first shaft  111   a  of the first holding mechanism  110   a  among the plural holding mechanisms  110   a ,  110   b . The first holding mechanism motor  114   a  preferably is a servo motor. The first transmission mechanism  115   a  transmits the driving force of the first holding mechanism motor  114   a  to the second layer shaft  134  of the frame shaft  130 . The second transmission mechanism  115   b  transmits the driving force that has been transmitted to the second layer shaft  134  of the frame shaft  130  to the first shaft  111   a  of the first holding mechanism  110   a  that is the driving target of the first holding mechanism motor  114   a.    
     The first transmission mechanism  115   a  includes a belt  115   a   1 , a drive roller  115   a   2 , and a follower roller  115   a   3 . The belt  115   a   1  is entrained about the drive roller  115   a   2  and the follower roller  115   a   3 . The drive roller  115   a   2  is connected to the first holding mechanism motor  114   a  and is driven by the first holding mechanism motor  114   a . The follower roller  115   a   3  is connected to one end of the second layer shaft  134  of the frame shaft  130 . When the first holding mechanism motor  114   a  is driven, the drive roller  115   a   2  rotates, the follower roller  115   a   3  rotates via the belt  115   a   1 , and the second layer shaft  134  also rotates. 
     The second transmission mechanism  115   b  includes a belt  115   b   1 , a drive roller  115   b   2 , and a follower roller  115   b   3 . The belt  115   b   1  is entrained about the drive roller  115   b   2  and the follower roller  115   b   3 . The drive roller  115   b   2  is connected to one end (the end portion on the opposite side of the side where the follower roller  115   a   3  is connected) of the second layer shaft  134  of the frame shaft  130 , and when the second layer shaft  134  rotates, the drive roller  115   b   2  also rotates. The follower roller  115   b   3  is connected to one end (the end portion on the side supported by the holding mechanism support frame  120 ) of the first shaft  111   a  of the first holding mechanism  110   a . When the second layer shaft  134  rotates, the drive roller  115   b   2  rotates, the follower roller  115   b   3  rotates via the belt  115   b   1 , and the first shaft  111   a  of the first holding mechanism  110   a  also rotates. 
     As described above, when the first holding mechanism motor  114   a  is driven, the driving force of the first holding mechanism motor  114   a  is transmitted via the first transmission mechanism  115   a  and the second transmission mechanism  115   b  to the first shaft  111   a  of the first holding mechanism  110   a , whereby the first shaft  111   a  is rotated. As a result, the first film F 1  is drawn from the first film roll FR 1  mounted on the first shaft  111   a  of the first holding mechanism  110   a.    
     The second holding mechanism motor  114   b  rotates the second shaft  111   b  of the second holding mechanism  110   b  among the plural holding mechanisms  110   a ,  110   b . The second holding mechanism motor  114   b  preferably is a servo motor. The third transmission mechanism  115   c  transmits the driving force of the second holding mechanism motor  114   b  to the third layer shaft  136  of the frame shaft  130 . The fourth transmission mechanism  115   d  transmits the driving force that has been transmitted to the third layer shaft  136  of the frame shaft  130  to the second shaft  111   b  of the second holding mechanism  110   b  that is the driving target of the second holding mechanism motor  114   b.    
     The third transmission mechanism  115   c  includes a belt  115   c   1 , a drive roller  115   c   2 , and a follower roller  115   c   3 . The belt  115   c   1  is entrained about the drive roller  115   c   2  and the follower roller  115   c   3 . The drive roller  115   c   2  is connected to the second holding mechanism motor  114   b  and is driven by the second holding mechanism motor  114   b . The follower roller  115   c   3  is connected to one end of the third layer shaft  136  of the frame shaft  130 . When the second holding mechanism motor  114   b  is driven, the drive roller  115   c   2  rotates, the follower roller  115   c   3  rotates via the belt  115   c   1 , and the third layer shaft  136  also rotates. 
     The fourth transmission mechanism  115   d  includes a belt  115   d   1 , a drive roller  115   d   2 , and a follower roller  115   d   3 . The belt  115   d   1  is entrained about the drive roller  115   d   2  and the follower roller  115   d   3 . The drive roller  115   d   2  is connected to one end (the end portion on the opposite side of the side where the follower roller  115   c   3  is connected) of the third layer shaft  136  of the frame shaft  130 , and when the third layer shaft  136  rotates, the drive roller  115   d   2  also rotates. The follower roller  115   d   3  is connected to one end (the end portion on the side supported by the holding mechanism support frame  120 ) of the second shaft  111   b  of the second holding mechanism  110   b . When the third layer shaft  136  rotates, the drive roller  115   d   2  rotates, the follower roller  115   d   3  rotates via the belt  115   d   1 , and the second shaft  111   b  of the second holding mechanism  110   b  also rotates. 
     As described above, when the second holding mechanism motor  114   b  is driven, the driving force of the second holding mechanism motor  114   b  is transmitted via the third transmission mechanism  115   c  and the fourth transmission mechanism  115   d  to the second shaft  111   b  of the second holding mechanism  110   b , whereby the second shaft  111   b  is rotated. As a result, the second film F 2  is drawn from the second film roll FR 2  mounted on the second shaft  111   b  of the second holding mechanism  110   b.    
     (2-2-7) Leading End Portion Position Adjusting Mechanism 
     The leading end portion position adjusting mechanism  140  is a mechanism used mainly for adjusting the position of the leading end portion of the film F wound in the film roll FR and the neighboring portion of the terminal end of the film F when the replacement film roll FR has been mounted on the first holding mechanism  110   a  or the second holding mechanism  110   b . The leading end portion position adjusting mechanism  140  includes the leading end portion position adjustment sensor  142 , the film temporary placement member  143 , the temporary restraining mechanism  144 , and the terminal end position adjustment air nozzle  146  (see  FIG.  8   ). 
     (2-2-7-1) Leading End Portion Position Adjustment Sensor 
     The leading end portion position adjustment sensor  142  is a sensor that detects that the leading end portion of the film F is positioned in the prescribed position when a film roll FR is mounted on the first shaft  111   a  and the second shaft  111   b  of the first holding mechanism  110   a  and the second holding mechanism  110   b  disposed in the film roll setting position A 1  and the operator sets the leading end portion of the film F wound in that film roll FR in the prescribed position. It will be noted that the prescribed position of the leading end portion of the film F means a position where the leading end portion of the film F is disposed in the splicing position where the film F becomes spliced by the heater  162  when the holding mechanisms  110   a ,  110   b  in which the film roll FR positioned in the film roll setting position A 1  was set have been moved by the moving mechanism  139  to the film roll standby position A 3 . 
     The leading end portion position adjustment sensor  142  is disposed higher than the film temporary placement member  143 . 
     The leading end portion position adjustment sensor  142  is, for example, a registration mark sensor that detects the registration marks M printed on the printed surface Fa of the film F. Here, the leading end portion position adjustment sensor  142  detects that a registration mark M is positioned in a target position (the detection position of the leading end portion position adjustment sensor  142 ) and thereby detects, based on the detection result, that the leading end portion of the film F is positioned in the prescribed position. 
     (2-2-7-2) Film Temporary Placement Member 
     The film temporary placement member  143  is a member on which the neighborhood of the leading end portion of the film F pulled out from the film roll FR is manually temporarily placed when the operator of the bag-making and packaging apparatus  1000  attaches the replacement film roll FR to the holding mechanisms  110   a ,  110   b , namely, mounts the replacement film roll FR on the shafts  111   a ,  111   b  of the holding mechanisms  110   a ,  110   b . The film temporary placement member  143  has a temporary placement surface  143   a  on which the film F is temporarily placed. 
     The operation of setting the film F that the operator of the bag-making and packaging apparatus  1000  performs when attaching the replacement film roll FR (the first film roll FR 1 ) to the holding mechanisms  110   a ,  110   b  may be performed using known methods. Consequently, here, description is omitted. 
     (2-2-7-3) Temporary Restraining Mechanism 
     The temporary restraining mechanism  144  is disposed in the neighborhood of the film temporary placement member  143 . The temporary restraining mechanism  144  is a mechanism that temporarily restrains the film F to inhibit misalignment of the film F when the film F has been temporarily placed on the film temporary placement member  143 . The temporary restraining mechanism  144  temporarily restrains the film F with just enough force to allow conveyance of the film F when the film F is conveyed by the holding mechanism motors  114   a ,  114   b  as described later. 
     (2-2-7-4) Terminal End Position Adjustment Air Nozzle 
     The terminal end position adjustment air nozzle  146  blows air onto the neighborhood of the terminal end on the leading end portion side of the film F to perform positional adjustment of the neighborhood of the terminal end of the film F when the holding mechanisms  110   a ,  110   b  are moved by the moving mechanism  139  from the film roll setting position A 1  to the film roll standby position A 3 , or in other words when the leading end portion of the film F is moved to the splicing position where it becomes spliced by the heater  162 . The blowing-out of the air from the terminal end position adjustment air nozzle  146  is controlled by a terminal end position adjustment air electromagnetic valve  146   a  (see  FIG.  3   ). 
     The positional adjustment of the neighborhood of the terminal end of the film F by the terminal end position adjustment air nozzle  146  will now be described taking as an example positional adjustment of the neighborhood of the terminal end of the first film F 1 , for example. 
     When the moving mechanism  139  rotates the holding mechanism support frame  120  the predetermined angle counter-clockwise to move the first holding mechanism  110   a  from the film roll setting position A 1  to the film roll standby position A 3 , the terminal end position adjustment air nozzle  146  blows air forwardly onto the printed surface F 1   a  (the surface on the rear side) in the neighborhood of the terminal end FIE on the leading end portion F 1 L side of the first film F 1 . As a result, the first film F 1  is positionally adjusted to a state in which it hangs down from the first film restraining mechanism  117  without wrapping around the fixed rollers  112  or the second film F 2  that is being utilized for bag-making (see  FIG.  9   ). 
     (2-3) Splicing Device 
     The splicing device  160  includes the heater  162 , the first clamp  163 , the second clamp  164 , the knife  166  (which corresponds to the “cutting member for cutting the film” in the claims), the pinch roller  168  (which corresponds to the “pinch roller for conveying the film” in the claims), the trailing end portion position adjustment first sensor  152 , the trailing end portion position adjustment second sensor  154 , and the cooling air electromagnetic valve  161   a  (see  FIG.  3    and  FIG.  9   ). 
     (2-3-1) Heater 
     The heater  162  is a mechanism that splices together the trailing end portion of the film F wound in the film roll FR mounted on one of the shafts  111   a ,  111   b  of the holding mechanisms  110   a ,  110   b  and the leading end portion of the film F wound in the film roll FR mounted on the other of the shafts  111   b ,  111   a  of the holding mechanisms  110   b ,  110   a  (see  FIG.  3    and  FIG.  9   ). The heater  162  is a mechanism that applies heat to and thermocompressively bonds the films F. 
     Referring to  FIG.  9   , for example, the heater  162  applies heat to and thermocompressively bonds the trailing end portion F 2 T of the second film F 2  wound in the second film roll FR 2  mounted on the second shaft  111   b  of the second holding mechanism  110   b  and the leading end portion F 1 L of the first film F 1  wound in the first film roll FR 1  mounted on the first shaft  111   a  of the first holding mechanism  110   a  in a state in which the trailing end portion F 2 T and the leading end portion F 1 L are sandwiched between the heater  162  and the first guide member  119  secured to the arm  122   a.    
     (2-3-2) First Clamp and Second Clamp 
     The first clamp  163  and the second clamp  164  are disposed along the conveyance path of the film F when the film F is fed to the bag-making and packaging unit  200 . The first clamp  163  and the second clamp  164  are members that clamp and secure the film F to inhibit misalignment of the trailing end portion of the film F of the used film roll FR after the trailing end portion of the film F of the used film roll FR has been positionally adjusted to the splicing position of the heater  162 . The operations of the first clamp  163  and the second clamp  164  (the clamping and unclamping of the film F) are controlled by activating and deactivating a first clamp drive mechanism  163   a  and a second clamp drive mechanism  164   a , respectively. It will be noted that the first clamp drive mechanism  163   a  and the second clamp drive mechanism  164   a  may be mechanisms that utilize air pressure as a drive source or may be mechanisms that utilize motors as a drive source. 
     (2-3-3) Knife 
     The knife  166  is a member that cuts unnecessary film F after the trailing end portion of the film F of the used film roll FR and the leading end portion of the film F of the replacement film roll FR have been spliced together by the heater  162  (see  FIG.  9   ). Execution of the cutting by the knife  166  and the stopping of the cutting by the knife  66  are controlled by activating and deactivating a knife drive mechanism  166   a . It will be noted that the knife drive mechanism  166   a  may be a mechanism that utilizes air pressure as a drive source or may be a mechanism that utilizes a motor as a drive source. 
     It will be noted that the bag-making and packaging apparatus  1000  has a knife activation detection sensor  166   b  for detecting that the knife  166  has been activated (in this embodiment, that the knife  166  has been driven downward to cut the film F) (see  FIG.  3   ). The knife activation detection sensor  166   b  may be disposed on the same side as the knife  166  (in this embodiment, the upper side where the splicing device  160  and the like are disposed) or may be disposed on the first guide member  119  side. 
     The knife activation detection sensor  166   b  is, for example, a photoelectric sensor. However, regarding the type of the knife activation detection sensor  166   b , it suffices for the sensor to be capable of detecting the movement of the knife  166 , and the sensor may also be an inductive or an electrostatic capacitive proximity sensor, for example. 
     (2-3-4) Pinch Roller 
     The pinch roller  168  pinches the film F between itself and another fixed roller and conveys the film F by rotating. The pinch roller  168  conveys the film F of the used film roll FR in a first direction D 1  (see  FIG.  9   ) so that the trailing end portion of the film F of the used film roll FR heads toward the film splicing position where splicing to the leading end portion of the film F of the new replacement film roll FR is performed by the heater  162 . The pinch roller  168  is a mechanism capable of changing the conveyance speed of the film F. 
     The pinch roller  168  will now be described in greater detail taking as an example the case shown in  FIG.  9    where the second film roll FR 2  is the used film roll FR and the first film roll FR 1  is the new replacement film roll FR. 
     The pinch roller  168  is pushed, by a pinch roller air cylinder  168   a , against a fixed roller  112  of the first holding mechanism  110   a  (in  FIG.  9   , a fixed roller  112   b  disposed uppermost among the three fixed rollers  112 ) at the timing when positional adjustment of the trailing end portion of the film F of the used film roll FR (here, the trailing end portion F 2 T of the second film F 2  of the second film roll FR 2 ) is performed. As a result, the second film F 2  is pinched between the pinch roller  168  and the fixed roller  112   b . In this state, the pinch roller  168  is rotated clockwise (see the arrow in  FIG.  9   ) as seen in a right side view by a pinch roller drive mechanism  168   b . The pinch roller drive mechanism  168   b  is, for example, a servo motor. When the pinch roller  168  is rotated by the pinch roller drive mechanism  168   b , the second film F 2  is conveyed in the first direction D 1  toward the second film roll FR 2  (in the opposite direction of the direction in which the second film F 2  is conveyed at the time of the bag-making and packaging operation). The pinch roller  168  conveys the second film F 2  of the second film roll FR 2  in the first direction D 1  until the trailing end portion F 2 T of the second film F 2  of the second film roll FR 2  reaches the film splicing position where splicing to the leading end portion F 1 L of the first film F 1  of the first film roll FR 1  is performed by the heater  162 . The way in which the driving of the pinch roller  168  by the pinch roller drive mechanism  168   b  is controlled is described later. 
     (2-3-5) Trailing End Portion Position Adjustment Sensors 
     The trailing end portion position adjustment first sensor  152  and the trailing end portion position adjustment second sensor  154  are sensors that detect, in a state in which the film F is being conveyed, the registration marks M for positional adjustment added to the film F of the used film roll FR. 
     The trailing end portion position adjustment first sensor  152  and the trailing end portion position adjustment second sensor  154  are disposed along the path on which the film F is conveyed by the pinch roller  168 . In particular, the trailing end portion position adjustment first sensor  152  and the trailing end portion position adjustment second sensor  154  are disposed along the conveyance path of the film F on the side of the printed surface Fa of the film F conveyed by the pinch roller  168 . The trailing end portion position adjustment second sensor  154  detects, on the downstream side of the trailing end portion position adjustment first sensor  152  in the direction in which the film F is conveyed by the pinch roller  168  (the first direction D 1 ), the registration marks M for positional adjustment added to the film F. 
     The trailing end portion position adjustment first sensor  152  and the trailing end portion position adjustment second sensor  154  are, for example, registration mark sensors. However, the type of the trailing end portion position adjustment first sensor  152  and the trailing end portion position adjustment second sensor  154  is not limited to registration mark sensors and, for example, may also be sensors utilizing cameras. 
     The way in which the driving of the pinch roller  168  by the pinch roller drive mechanism  168   b  is controlled utilizing the trailing end portion position adjustment first sensor and the trailing end portion position adjustment second sensor is described later. 
     (2-3-6) Cooling Air Electromagnetic Valve 
     The cooling air electromagnetic valve  161   a  is an electromagnetic valve for controlling the execution and stopping of the blowing-out of air from an air outlet  161  formed in the neighborhood of the heater  162 . The air blown out from the air outlet  161  cools the part of the film F spliced by the heater  162 . 
     (2-4) Control Unit 
     The control unit  300  controls the operations of each part of the bag-making and packaging apparatus  1000  (the various configurations of the bag-making and packaging unit  200  and the film feeding unit  100 ). 
     The control unit  300  has a microcomputer that has parts such as a CPU and a memory. The control unit  300  controls the operations of each part of the bag-making and packaging apparatus  1000  as a result of the CPU reading and executing programs stored in the memory. 
     It will be noted that a control unit may realize, by hardware such as a logic circuit or by a combination of hardware and software, functions that are the same as the functions that the control unit  300  of this embodiment exhibits. 
     The control unit  300  is electrically connected to, in a state in which it can send various types of signals to and receive various types of signals from, the devices configuring each part of the bag-making and packaging apparatus  1000 . For this reason, in a case where a malfunction occurs in any of the parts configuring the bag-making and packaging apparatus  1000 , the control unit  300  can detect the malfunction. 
     The control unit  300  receives the detection results of the leading end portion position adjustment sensor  142 , the trailing end portion position adjustment first sensor  152 , and the trailing end portion position adjustment second sensor  154 . Furthermore, the control unit  300  receives the detection result of the encoder  188  (the angle of rotation of the shaft  184   a  connected to the arms  186  to which the movable rollers  185  are secured). The detection result of the encoder  188  is used in the control of the position of the movable rollers  185 . The detection result of the encoder  188  may also be used in the detection of the trailing end of the film roll FR described later. 
     (3) CONTROL OF OPERATION OF BAG-MAKING AND PACKAGING APPARATUS  1000  BY CONTROL UNIT 
     (3-1) Normal Operation 
     The control unit  300  controls the operations of each part of the bag-making and packaging apparatus  1000  in the following way during normal operation in which the bag-making and packaging unit  200  performs the bag-making and packaging operation. 
     The control unit  300  controls the film conveyor belts  220  so that the sheet-like film F pulled out from the film roll FR is conveyed at a predetermined speed (a speed decided from, for example, the operating load of the bag-making and packaging apparatus  1000 ) using the holding mechanism motors  114   a ,  114   b  of the film drawing mechanism  116 . 
     The control unit  300  controls the start-up and stopping of the holding mechanism motors  114   a ,  114   b  of the film drawing mechanism  116  and the speed at which the film roll FR is rotated by the holding mechanism motors  114   a ,  114   b  of the film drawing mechanism  116  based on the state of conveyance of the film F and the detection result of the encoder  188 . That is, the control unit  300  controls the film drawing mechanism  116  to change the drawing speed of the film F at the time of the bag-making and packaging operation in the bag-making and packaging unit  200 . 
     For example, the control unit  300  starts up and stops the holding mechanism motors  114   a ,  114   b  of the film drawing mechanism  116  drawing out the film F in accordance with the timing when the control unit  300  operates and stops the film conveyor belts  220 . In other words, the control unit  300  changes the speed at which the film F is drawn by the holding mechanism motors  114   a ,  114   b  of the film drawing mechanism  116  based on the conveyance speed of the film conveyor belts  220  at the time of the bag-making and packaging operation in the bag-making and packaging unit  200 . 
     Furthermore, the control unit  300  controls the speed at which the shafts  111   a ,  111   b  holding the film roll FR are rotated by the holding mechanism motors  114   a ,  114   b  of the film drawing mechanism  116  based on the detection result of the encoder  188 . In other words, the control unit  300  changes the speed at which the film F is drawn by the holding mechanism motors  114   a ,  114   b  of the film drawing mechanism  116  based on the detection result of the encoder  188 , namely, the position of the movable rollers  185 , at the time of the bag-making and packaging operation in the bag-making and packaging unit  200 . 
     Furthermore, the control unit  300  controls the movable roller mechanism air cylinder  187  so that the movable rollers  185  cause constant force to act on the film F that is being conveyed. 
     Furthermore, the control unit  300  controls the operations of the longitudinal sealing mechanism  230  and the transverse sealing mechanism  240  so that the longitudinal sealing mechanism  230  performs longitudinal sealing of the tubular film Ft at a predetermined timing and the transverse sealing mechanism  240  performs transverse sealing of the tubular film Ft at a predetermined timing. 
     (3-2) Auto-Feeding Function 
     Operations relating to the auto-feeding function of the bag-making and packaging apparatus  1000  are described below. 
     (3-2-1) Operation of Setting Replacement Film Roll 
     In a case where the control unit  300  utilizes the auto-feeding function, the operator sets the replacement film roll FR in the holding mechanism  110   a ,  110   b . Here, the work of the operator when setting the replacement film roll FR in the holding mechanism  110   a ,  110   b  will be described. Furthermore, the operation of the bag-making and packaging apparatus  1000  in which the replacement film roll FR has been set in the holding mechanism  110   a ,  110   b  by the operator will also be jointly described. 
     It will be noted that here the work of the operator when setting the first film roll FR 1  in the first holding mechanism  110   a  and the operation of the bag-making and packaging apparatus  1000  are described as an example. The operation of setting the second film roll FR 2  in the second holding mechanism  110   b  is the same as the operation of setting the first film roll FR 1  in the first holding mechanism  110   a , so description thereof is omitted here. 
     First, the operator mounts the first film roll FR 1  on the first shaft  111   a  of the first holding mechanism  110   a  disposed in the film roll setting position A 1 . Next, the operator pulls out the first film F 1  from the first film roll FR 1 , puts the first film F 1  along the upper surface of the first guide member  119 , and then guides the first film F 1  between the fixed rollers  112  and the movable roller  118  of the first film restraining mechanism  117 . Moreover, the operator manually temporarily places, on the temporary placement surface  143   a  of the film temporary placement member  143 , the neighborhood of the leading end portion of the film F pulled out from the film roll FR. Next, the operator operates the temporary restraining mechanism  144  to temporarily restrain the first film F 1  that has been temporarily placed on the temporary placement surface  143   a  of the film temporary placement member  143 . Thereafter, the operator operates switches  102  provided on the back side of the film feeding unit  100  to instruct the control unit  300  to align the leading end portion F 1 L of the first film F 1 . 
     The control unit  300 , in response to the instruction to align the leading end portion F 1 L of the first film F 1 , activates the connection mechanism  111   a   1  of the first shaft  111   a  to connect and secure the first film roll FR 1  to the first shaft  111   a . Furthermore, the control unit  300  drives the air cylinder  118   a  to push the movable roller  118  against the fixed rollers  112  (in particular, the fixed roller  112   a  in the middle), sandwich the first film F 1  between the movable roller  118  and the fixed rollers  112 , and restrain the first film F 1 . As a result, misalignment of the first film F 1  is inhibited. Next, the control unit  300  rotates the first holding mechanism motor  114   a  of the film drawing mechanism  116  to thereby rotate the first shaft  111   a  counter-clockwise as seen in a right side view. As a result, the first film F 1  is taken up on the first film roll FR 1 , and the terminal end F 1 E of the first film F 1  is conveyed to the leading end portion position adjustment sensor  142 . The control unit  300  stops the conveyance of the first film F 1  by the first holding mechanism motor  114   a  when the leading end portion position adjustment sensor  142  detects the registration mark M added to the first film F 1  that is conveyed (the registration mark M printed on the printed surface F 1   a  of the first film F 1  and located in the neighborhood of the terminal end F 1 E of the first film F 1 ). In this state, the leading end portion F 1 L of the first film F 1  is disposed in the prescribed position. Summarizing the above, after the neighborhood of the leading end portion F 1 L of the first film F 1  has been temporarily placed on the film temporary placement member  143 , the control unit  300  when utilizing the auto-feeding function causes the first holding mechanism motor  114   a  to rotate the first film roll FR 1  to thereby convey the first film F 1  along a predetermined conveyance path. The control unit  300  conveys the first film F 1  along the predetermined conveyance path until the leading end portion position adjustment sensor  142  detects that the leading end portion F 1 L of the first film F 1  is positioned in the prescribed position. 
     With this, the control unit  300  ends the alignment of the leading end portion F 1 L of the first film F 1 . 
     Next, the moving mechanism  139  moves the first holding mechanism  110   a  from the film roll setting position A 1  to the film roll standby position A 3  before the leading end portion F 1 L of the first film F 1  of the first film roll FR 1  mounted on the first shaft  111   a  of the first holding mechanism  110   a  becomes connected by the heater  162  to the trailing end portion F 2 T of the second film F 2  of the second film roll FR 2  mounted on the second shaft  111   b  of the second holding mechanism  110   b . In other words, the control unit  300  when utilizing the auto-feeding function controls the moving mechanism  139  (controls the frame rotation motor  138 ) to rotate the holding mechanism support frame  120  the predetermined angle and move the first holding mechanism  110   a  from the film roll setting position A 1  to the film roll standby position A 3  so that the leading end portion F 1 L of the first film F 1  is disposed in the place where it becomes spliced by the heater  162 . The first holding mechanism  110   a  that has been moved to the film roll standby position A 3  stands by in that location, without particularly operating at all, until the trailing end of the second film F 2  of the second film roll FR 2  of the second holding mechanism  110   b  is detected. 
     It will be noted that it is preferred that, when the control unit  300  moves the first holding mechanism  110   a  from the film roll setting position A 1  to the film roll standby position A 3 , the control unit  300  performs positional adjustment of the neighborhood of the terminal end FIE of the first film F 1  by controlling the terminal end position adjustment air electromagnetic valve  146   a  to blow air from the terminal end position adjustment air nozzle  146  onto the neighborhood of the terminal end FIE on the leading end portion F 1 L side of the first film F 1 . 
     (3-2-2) Operation Relating to Auto-Splicing of Trailing End Portion of Film of Used Film Roll and Leading End Portion of Film of Replacement Film Roll 
     The operation of the bag-making and packaging apparatus  1000  relating to the auto-splicing of the film rolls FR when utilizing the auto-feeding function will now be described. It will be noted that here description is given taking as an example a case where the second film roll FR 2  is the used film roll (the film roll that had been used for bag-making and packaging) and the first film roll FR 1  is the replacement film roll. 
     The auto-splicing of the film rolls FR is triggered by detection of the trailing end of the film roll FR that is in use. 
     The control unit  300  detects the trailing end of the second film roll FR 2  based on the detection result of the encoder  188 , for example. The control unit  300  detects the trailing end of the second film roll FR 2  based on a physical quantity relating to the position of the movable rollers  185  that the encoder  188  detects, specifically, the angle of rotation of the shaft  184   a  to which are connected the arms  186  to which the movable rollers  185  are secured. 
     During the normal operation of the bag-making and packaging apparatus  1000 , the position of the movable rollers  185  is controlled to a predetermined position (a predetermined region). However, once the trailing end of the film roll FR is reached, the film F cannot be pulled out any further from the film roll FR, so even if the control unit  300  controls the operations of each part of the bag-making and packaging apparatus  1000 , the movable rollers  185  are lifted up by the film F and move upward beyond the predetermined region. Thus, the control unit  300  determines whether or not the angle of rotation of the shaft  184   a  that the encoder  188  detects has exceeded a predetermined threshold value (whether or not the arms  186  have rotated to a position they cannot take during normal operation). Then, in a case where the angle of rotation of the shaft  184   a  has exceeded the predetermined threshold value, the control unit  300  detects the trailing end of the film roll FR. 
     It will be noted that although in this embodiment the trailing end of the film roll FR is detected using the encoder  188  as a sensor, the detection of the trailing end of the film roll FR is not limited to this way. For example, in another configuration, a photoelectric sensor  190  (see  FIG.  2   ) disposed in the neighborhood of the film feeding positions A 2 , A 4  may also detect the trailing end of the film roll FR by detecting an end mark (not shown in the drawings) added to the film F and indicating the trailing end of the film roll FR (in  FIG.  4   , the photoelectric sensor  190  is omitted). 
     The control unit  300  stops the operations of the film conveyor belts  220 , the longitudinal sealing mechanism  230 , and the transverse sealing mechanism  240  when the sensor such as the encoder  188  or the photoelectric sensor  190  has detected the trailing end of the film roll FR. Furthermore, the control unit  300  stops the operation of the second holding mechanism motor  114   b  of the film drawing mechanism  116  when the sensor such as the encoder  188  or the photoelectric sensor  190  has detected the trailing end of the film roll FR. 
     Furthermore, when the sensor such as the encoder  188  or the photoelectric sensor  190  has detected the trailing end of the film roll FR, the control unit  300  drives the pinch roller air cylinder  168   a  to push the pinch roller  168  against one of the fixed rollers  112  (the fixed roller  112   b ) of the first holding mechanism  110   a  to thereby pinch the second film F 2  between the pinch roller  168  and the fixed roller  112   b . Moreover, the control unit  300  drives the pinch roller drive mechanism  168   b  clockwise as in  FIG.  9    as seen in a right side view to start conveyance of the second film F 2  in the first direction D 1  (the opposite direction of the conveyance direction of the film F during normal operation). The fixed roller  112   c  disposed lowermost and frontmost in the state shown in  FIG.  9    among the fixed rollers  112  of the first holding mechanism  110   a  is utilized as a guide during the conveyance of the second film F 2  by the pinch roller  168 . 
     At this time, the control unit  300  controls the pinch roller drive mechanism  168   b  to convey the second film F 2  at a conveyance speed V 1  in the first direction D 1  until the trailing end portion position adjustment first sensor  152  detects the registration mark M printed on the printed surface F 2   a  of the second film F 2 . After the trailing end portion position adjustment first sensor  152  has detected the registration mark M, the control unit  300  conveys the second film F 2  at a conveyance speed V 2  in the first direction D 1 . Then, when the trailing end portion position adjustment second sensor  154  detects the registration mark M, the control unit  300  judges that the trailing end portion F 2 T of the second film F 2  has reached the film splicing position where splicing is performed by the heater  162 . Then, the control unit  300  performs control that stops the pinch roller drive mechanism  168   b  to stop the conveyance of the second film F 2  by the pinch roller  168 . 
     When the trailing end portion position adjustment second sensor  154  detects the registration mark M printed on the printed surface F 2   a  of the second film F 2  and, based on this, the conveyance of the second film F 2  by the pinch roller  168  is stopped, the trailing end portion F 2 T of the second film F 2  is in the position where it becomes spliced by the heater  162 . In this state, the control unit  300  drives the first clamp drive mechanism  163   a  and the second clamp drive mechanism  164   a  to restrain the second film F 2  with the first clamp  163  and the second clamp  164  in order to inhibit misalignment of the trailing end portion F 2 T of the second film F 2 . Furthermore, the control unit  300  controls the heater  162  to splice together the trailing end portion F 2 T of the second film F 2  and the leading end portion F 1 L of the first film F 1 . For example, the control unit  300  executes, at generally the same timing, the driving of the first clamp drive mechanism  163   a  and the second clamp drive mechanism  164   a  and the splicing together of the trailing end portion F 2 T of the second film F 2  and the leading end portion F 1 L of the first film F 1  by the heater  162 . Next, the control unit  300  drives the knife drive mechanism  166   a  to cut the film F with the knife  166  in order to cut away unnecessary first film F 1  and second film F 2  from the film F used in normal operation. 
     Next, the control unit  300  controls the second clamp drive mechanism  164   a  to cancel the restraint of the second film F 2  by the second clamp  164 . Furthermore, the control unit  300  controls the cooling air electromagnetic valve  161   a  to blow air from the air outlet  161  onto the place where the first film F 1  and the second film F 2  have been spliced together. Moreover, the control unit  300  controls the first clamp drive mechanism  163   a  to cancel the restraint of the film F by the first clamp  163 . Furthermore, the control unit  300  controls the pinch roller air cylinder  168   a  to move the pinch roller  168  away from the fixed roller  112   b  and cancel the restraint of the film F by the pinch roller  168 . 
     Thereafter, the control unit  300  has the moving mechanism  139  move the first holding mechanism  110   a  positioned in the film roll standby position A 3  to the film feeding position A 2  and activates the film conveyor belts  220 , the longitudinal sealing mechanism  230 , and the transverse sealing mechanism  240  to return to normal operation. It will be noted that when the first holding mechanism  110   a  is moved to the film feeding position A 2 , the second holding mechanism  110   b  moves to the film roll setting position A 1 . Then, a new (replacement) second film roll FR 2  may be set in the second holding mechanism  110   b.    
     In this way, when the control unit  300  utilizes the auto-feeding function, the control unit  300  feeds to the bag-making and packaging unit  200  to the film F spliced by the splicing device  160  to take the place of the film F currently being fed to the bag-making and packaging unit  200 . The control unit  300  allows the bag-making operation to continue by utilizing the auto-feeding function. 
     (4) NON-AUTO-FEEDING MODE 
     The operation of the bag-making and packaging apparatus  1000  controlled by the control unit  300  utilizing the auto-feeding function has been described above. 
     However, in a case where the control unit  300  is utilizing the auto-feeding function and at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning, there is the concern that the bag-making operation will stop. It will be noted that “a case where at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning” here means a case where at least one of the parts configuring the film feeding unit  100  and the parts configuring the splicing device  160  is malfunctioning. 
     For example, in a case where the first holding mechanism motor  114   a  or the second holding mechanism motor  114   b  is malfunctioning, the feeding of the film F stops. Alternatively, in a case where the frame rotation motor  138  is malfunctioning, the first holding mechanism  110   a  and the second holding mechanism  110   b  cannot be moved to the film roll standby position A 3 , for example. In other words, the leading end portion of the film F cannot be moved to the splicing position where it is spliced by the heater  162 . Alternatively, in a case where the photoelectric sensors  408 A,  408 B are malfunctioning, the posture of the holding mechanism support frame  120  cannot be detected. For this reason, there is the concern that the leading end portion of the film F will be moved to a position not aligned with the splicing position where it is spliced by the heater  162 . Alternatively, in a case where the pinch roller  168  is malfunctioning, the trailing end portion of the film F cannot be moved to the splicing position where it is spliced by the heater  162 . Alternatively, in a case where the heater  162  is malfunctioning, the trailing end portion of the film F and the leading end portion of the film F cannot be spliced together. Alternatively, in a case where the knife  166  is malfunctioning, unnecessary film F cannot be cut after the trailing end portion of the film F and the leading end portion of the film F have been spliced together by the heater  162 . 
     In this way, in a case where at least one of the parts configuring the film feeding unit  100  and the parts configuring the splicing device  160  is malfunctioning, there is the concern that the bag-making operation will stop. 
     Here, the bag-making and packaging apparatus  1000  pertaining to this embodiment has, as operating modes, the auto-feeding mode that utilizes the auto-feeding function and the non-auto-feeding mode that does not utilize the auto-feeding function. The control unit  300  of the bag-making and packaging apparatus  1000  pertaining to this embodiment stops the auto-feeding function and executes the non-auto-feeding mode when it judges that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning in a case where the control unit  300  is utilizing the auto-feeding function (in other words, in the auto-feeding mode). More specifically, the control unit  300  stops the auto-feeding function and executes the non-auto-feeding mode when it judges that at least one of the first holding mechanism motor  114   a , the second holding mechanism motor  114   b , the frame rotation motor  138 , the photoelectric sensors  408 A,  408 B, the pinch roller  168 , the heater  162 , and the knife  166  is malfunctioning. 
     The non-auto-feeding mode is an operating mode that allows the bag-making operation to be continued by the bag-making and packaging unit  200  and the film roll holding unit that is operable among the plural film roll holding units. 
     It will be noted that “the film roll holding unit that is operable” here means the film roll holding unit that can draw the film F to the bag-making and packaging unit  200 . This is described in detail below. 
     (4-1) Changing the Operating Mode 
     A flow until the operating mode of the bag-making and packaging apparatus  1000  switches from the auto-feeding mode to the non-auto-feeding mode will now be described with reference to the flowchart shown in  FIG.  12   . Here, description is given supposing a case where the control unit  300  utilizing the auto-feeding function has detected that the second holding mechanism motor  114   b  of the second holding mechanism  110   b  disposed in the film roll setting position A 1  is malfunctioning. It will be noted that the flowchart in  FIG.  12    is an example and may be changed as appropriate. For example, the order of the steps may be changed, some steps may be executed in parallel with other steps, and other steps may be added anew to the extent that there are no incompatibilities. 
     In step S 1  the control unit  300  utilizing the auto-feeding function judges that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning. Here, the control unit  300  judges that the second holding mechanism motor  114   a  is malfunctioning. As described above, the control unit  300  is electrically connected to, in a state in which it can send various types of signals to and receive various types of signals from, the devices configuring each part of the bag-making and packaging apparatus  1000 . For this reason, the control unit  300  can judge that the second holding mechanism  110   b  is malfunctioning based on the various types of signals sent from each part of the bag-making and packaging apparatus  1000 . 
     In step S 2  the control unit  300  stops the auto-feeding function. 
     In step S 3  the control unit  300  stops the operation of the bag-making and packaging unit  200 . In accompaniment with the operation of the bag-making and packaging unit  200  stopping, the feeding of the film F by the film feeding unit  100  and the auto-splicing by the splicing device  160  stop. 
     In step S 4  the control unit  300  receives from the operator a selection of the film roll holding unit to operate in the non-auto-feeding mode. In other words, the operator selects which film roll holding unit among the first holding mechanism  110   a  and the second holding mechanism  110   b  to operate in the non-auto-feeding mode. 
     Here, the selection of the film roll holding unit to operate in the non-auto-feeding mode is performed by selecting the motor that rotates the film roll. The selection of the motor that rotates the film roll can be input using the liquid crystal display  96 , for example.  FIG.  13    is an example of a screen displayed on the liquid crystal display  96 . For example, the operator selects the motor to operate in the non-auto-feeding mode from the item “Valid Film Feeding Motor (Malfunction Mode)” shown in  FIG.  13   . Here, in a case where, for example, the operator selects the first holding mechanism motor  114   a , the first holding mechanism  110   a  operates in the non-auto-feeding mode. Conversely, in a case where the operator selects the second holding mechanism motor  114   b , the second holding mechanism  110   b  operates in the non-auto-feeding mode. 
     However, in a case where either motor of the first holding mechanism motor  114   a  and the second holding mechanism motor  114   b  is malfunctioning, the malfunctioning motor cannot be selected. Consequently, in this case, the film roll holding unit to operate in the non-auto-feeding mode is automatically decided to be the first holding mechanism  110   a.    
     In step S 5  the control unit  300  changes the path of the film F. The path of the film F includes a first path FP 1  and a second path FP 2 . The first path FP 1  is a path when utilizing the splicing device  160 . More specifically, the first path FP 1  is a path used when the control unit  300  feeds the film F utilizing the splicing device  160  (see  FIG.  9   ). 
     The second path FP 2  is a path different from the first path FP 1  which is the path when utilizing the splicing device  160 . In other words, the second path FP 2  is a path used when the control unit  300  feeds the film F without utilizing the splicing device  160 . The second path FP 2  is, for example, a path of the film F that extends from the film roll setting position A 1  toward the plural rollers  170  (see  FIG.  14   ). In this way, in the bag-making and packaging apparatus  1000  pertaining to this embodiment, when the operating mode switches to the non-auto-feeding mode, the path of the film F is changed to the second path FP 2 . 
     In order to change the path of the film F to the second path FP 2 , the control unit  300  activates the frame rotation motor  138 . In this case, the first holding mechanism  110   a  is selected as the film roll holding unit to operate in the non-auto-feeding mode. In this case, the control unit  300  activates the frame rotation motor  138  so that the first holding mechanism  110   a  moves to the film roll setting position A 1 . It will be noted that in a case where the frame rotation motor  138  is malfunctioning, the first holding mechanism  110   a  is manually moved by the operator to the film roll setting position A 1 . Furthermore, in a case where the frame rotation motor  138  is malfunctioning, the operator uses a stopper or the like (not shown in the drawings) to secure the first holding mechanism  110   a  in the film roll setting position A 1 . It will be noted that in step S 5  the bag-making operation remains stopped. For this reason, even in a case where the operator manually moves the first holding mechanism  110   a , the safety of the operator is ensured. 
     In step S 6  the control unit  300  receives from the operator an operation for switching the operating mode. The control unit  300  can switch the operating mode to the non-auto-feeding mode by receiving the operation for switching the operating mode. The operation for switching the operating mode can be received from the operating mode switching unit  96   a . In this embodiment, the operating mode switching unit  96   a  is the liquid crystal display  96 .  FIG.  13    is an example of a screen displayed on the liquid crystal display  96  functioning as the operating mode switching unit  96   a . For example, the operator can switch the operating mode to the non-auto-feeding mode from the item “Malfunction Mode” on the operation screen shown in  FIG.  13   . It will be noted that in this embodiment the operating mode switching unit  96   a  is controlled so that it can accept the operation for switching to the non-auto-feeding mode only when the operation of the bag-making and packaging unit  200  is stopped. Furthermore, in step S 6  the bag-making operation remains stopped. For this reason, the safety of the operator when the operator inputs to the operating mode switching unit  96   a  the operation for switching the operating mode is ensured. 
     In step S 7  the control unit  300  judges whether or not the path of the film F has been changed from the first path FP 1  to the second path FP 2 . The control unit  300  pertaining to this embodiment judges that the path of the film F has been changed from the first path FP 1  to the second path FP 2  by receiving the operation for switching the operating mode. It will be noted that the bag-making and packaging apparatus  1000  may also be equipped with a sensor and/or a camera capable of detecting the path of the film F. In this case, the control unit  300  may judge whether or not the path of the film F has been changed from the first path FP 1  to the second path FP 2  based on a signal sent from the sensor and/or the camera. 
     In step S 8  the control unit  300  resumes the operation of the bag-making and packaging unit  200 . In other words, in step S 8  the control unit  300  resumes the bag-making operation. 
     In this way, the operating mode of the bag-making and packaging apparatus  1000  switches from the auto-feeding mode to the non-auto-feeding mode. The bag-making and packaging apparatus  1000  in the non-auto-feeding mode can perform the bag-making operation in substantially the same way as when it performs the bag-making operation in the auto-feeding mode except that the path of the film F is changed to the second path FP 2 . In other words, the bag-making and packaging apparatus  1000  can continue the bag-making operation even in the non-auto-feeding mode. For this reason, in the bag-making and packaging apparatus  1000  pertaining to this embodiment, a reduction in productivity is inhibited even in a case where a malfunction occurs in at least one of the film feeding unit  100  and the splicing device  160 . 
     (4-2) Operation of Setting Replacement Film Roll in Non-Auto-Feeding Mode 
     Next, the operation of replacing the film roll FR in the non-auto-feeding mode will be described. It will be noted that, below, description is given supposing a case where the first holding mechanism  110   a  is selected as the film roll holding unit to operate in the non-auto-feeding mode. 
     The control unit  300  in the non-auto-feeding mode stops the operations of the film conveyor belts  220 , the longitudinal sealing mechanism  230 , and the transverse sealing mechanism  240  when the sensor such as the encoder  188  or the photoelectric sensor  190  has detected the trailing end of the film roll FR. Furthermore, the control unit  300  stops the operation of the first holding mechanism motor  114   a  when the sensor such as the encoder  188  or the photoelectric camera  190  has detected the trailing end of the film roll FR. Moreover, the control unit  300  uses a notification unit or the like (not shown in the drawings) to notify the operator that the film roll FR needs to be replaced when the sensor such as the encoder  188  or the photoelectric sensor  190  has detected the trailing end of the film roll FR. At this time, the control unit  300  does not rotate the holding mechanism support frame  120 . In other words, the control unit  300  does not move the first holding mechanism  110   a  from the film roll setting position A 1 . 
     Next, the operator detaches the used film roll FR from the first shaft  111   a  of the first holding mechanism  110   a  disposed in the film roll setting position A 1  and mounts the replacement film roll FR. At this time, the splicing together of the trailing end portion of the used film roll FR and the leading end portion of the replacement film roll FR is manually performed by the operator. Furthermore, the operator manually cuts unnecessary film F after splicing together the trailing end portion of the used film roll FR and the leading end portion of the replacement film roll FR. 
     Thereafter, the operator operates the switches  102  provided on the back side of the film feeding unit  100  to input the fact that the operator has finished the work of replacing the film roll FR. The control unit  300  receiving the input activates the film conveyor belts  220 , the longitudinal sealing mechanism  230 , and the transverse sealing mechanism  240  to resume the bag-making operation in the non-auto-feeding mode. In this way, the bag-making operation in the non-auto-feeding mode continues. 
     (5) CHARACTERISTICS 
     5-1 
     The bag-making and packaging apparatus  1000  pertaining to this embodiment includes the bag-making and packaging unit  200 , the film feeding unit  100 , the splicing device  160 , and the control unit  300 . The bag-making and packaging unit  200  forms the sheet-like film F into a tubular shape. The bag-making and packaging unit  200  seals the film F that has been formed into the tubular shape to thereby form the film F into bags. The film feeding unit  100  has plural film roll holding units that hold the film rolls FR in which the sheet-like film F is wound. The film feeding unit  100  feeds to the bag-making and packaging unit  200  the film F that is drawn from one film roll FR. The splicing device  160  automatically splices together the film F being fed from the film feeding unit  100  and the film F that is wound in another film roll FR. The control unit  300  allows the bag-making operation to continue by utilizing the auto-feeding function that feeds to the bag-making and packaging unit  200  the film F spliced by the splicing device  160  to take the place of the film F currently being fed to the bag-making and packaging unit  200 . When the control unit  300  judges that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning in a case where the control unit  300  is utilizing the auto-feeding function, the control unit  300  stops the auto-feeding function and executes the non-auto-feeding mode. The non-auto-feeding mode allows the bag-making operation to be continued by the bag-making and packaging unit  200  and the film roll holding unit that is operable among the plural film roll holding units. 
     According to this configuration, when the control unit  300  judges that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning, the control unit  300  stops the auto-feeding function and executes the non-auto-feeding mode. The non-auto-feeding mode allows the bag-making operation to be continued by the bag-making and packaging unit  200  and the film roll holding unit that is operable among the plural film roll holding units. For this reason, in the bag-making and packaging apparatus  1000  pertaining to this embodiment, a reduction in productivity is inhibited even in a case where a malfunction occurs in at least one of the film feeding unit  100  and the splicing device  160 . It will be noted that in this embodiment the first holding mechanism  110   a  and the second holding mechanism  110   b  correspond to the film roll holding units. 
     5-2 
     The bag-making and packaging apparatus  1000  pertaining to this embodiment further includes the operating mode switching unit  96   a . The operating mode switching unit  96   a  at least receives an operation for switching the operating mode from an operator. 
     5-3 
     In the bag-making and packaging apparatus  1000  pertaining to this embodiment, when the control unit  300  judges that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning in a case where the control unit  300  is utilizing the auto-feeding function, the control unit  300  stops the auto-feeding function and stops the operation of the bag-making and packaging unit  200 . 
     According to this configuration, when the control unit  300  judges that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning, the operation of the bag-making and packaging unit  200  stops. For this reason, in the bag-making and packaging apparatus  1000  pertaining to this embodiment, the safety of the operator in a case where a malfunction occurs in at least one of the film feeding unit  100  and the splicing device  160  is ensured. 
     Furthermore, because the operation of the bag-making and packaging unit  200  stops in a case where at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning, the operator can easily perceive that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning. 
     5-4 
     In the bag-making and packaging apparatus  1000  pertaining to this embodiment, when the control unit  300  stops the operation of the bag-making and packaging unit  200 , the control unit  300  switches to the non-auto-feeding mode in a case where the operating mode switching unit  96   a  that at least receives an operation for switching the operating mode from the operator has received an operation to switch to the non-auto-feeding mode. 
     According to this configuration, the switch to the non-auto-feeding mode is performed after the operation of the bag-making and packaging unit  200  has stopped. For this reason, in the bag-making and packaging apparatus  1000  pertaining to this embodiment, the safety of the operator when switching the bag-making and packaging apparatus  1000  to the non-auto-feeding mode is ensured. 
     5-5 
     In the bag-making and packaging apparatus  1000  pertaining to this embodiment, when the control unit  300  stops the operation of the bag-making and packaging unit  200 , the control unit  300  resumes the operation of the bag-making and packaging unit  200  in a case where the path of the film F fed to the bag-making and packaging unit  200  has been changed from the first path FP 1  to the second path FP 2 . The first path FP 1  is a path when utilizing the splicing device. The second path FP 2  is a path different from the first path FP 1 . 
     According to this configuration, the operation of the bag-making and packaging unit  200  resumes after the path of the film has been changed. For this reason, in the bag-making and packaging apparatus  1000  pertaining to this embodiment, the safety of the operator when changing the path of the film F in the bag-making and packaging apparatus  1000  is ensured. 
     5-6 
     In the bag-making and packaging apparatus  1000  pertaining to this embodiment, the film feeding unit  100  includes at least one of motors that rotate the film rolls FR, a motor that rotates a frame that supports the film roll holding units, and sensors that detect the posture of the frame that supports the film roll holding units. The splicing device  160  includes at least one of the heater  162  for applying heat to and thermocompressively bonding the film F, a cutting member for cutting the film F, and the pinch roller  168  for conveying the film F. 
     According to this configuration, when the control unit  300  judges that at least one of the motors that rotate the film rolls FR, the motor that rotates the frame that supports the film roll holding units, the sensors that detect the posture of the film roll holding units, the heater  162  for applying heat to and thermocompressively bonding the film, the cutting member for cutting the film F, and the pinch roller  168  for conveying the film F is malfunctioning, the control unit  300  stops the auto-feeding function and executes the non-auto-feeding mode. For this reason, in the bag-making and packaging apparatus  1000  pertaining to this embodiment, a reduction in productivity is inhibited. 
     It will be noted that in this embodiment the first holding mechanism motor  114   a  and the second holding mechanism motor  114   b  correspond to the motors that rotate the film rolls FR. Furthermore, the holding mechanism support frame  120  corresponds to the frame that supports the film roll holding units. Furthermore, the frame rotation motor  138  corresponds to the motor that rotates the frame that supports the film roll holding units. Furthermore, the photoelectric sensors  408 A,  408 B correspond to the sensors that detect the posture of the film roll holding units. Furthermore, the knife  166  corresponds to the cutting member for cutting the film F. 
     (6) EXAMPLE MODIFICATIONS 
     Example modifications of the embodiment are described below. The example modifications may be combined as appropriate to the extent that they are not mutually incompatible. 
     (6-1) Example Modification A 
     In the above embodiment, an example of the bag-making and packaging apparatus  1000  in which the operating mode switches to the non-auto-feeding mode as a result of the operating mode switching unit  96   a  receiving an operation for switching the operating mode from the operator was described. However, examples of the bag-making and packaging apparatus are not limited to this. 
     For example, the bag-making and packaging apparatus may also be equipped with a control unit that automatically switches the operating mode to the non-auto-feeding mode when it judges that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning. 
     Furthermore, in the above embodiment, an example of the bag-making and packaging apparatus  1000  that receives from the operator a selection of the film roll holding unit to operate in the non-auto-feeding mode was described. However, examples of the bag-making and packaging apparatus are not limited to this, and the bag-making and packaging apparatus may also be equipped with a control unit that automatically decides the film roll holding unit to operate in the non-auto-feeding mode. 
     (6-2) Example Modification B 
     Although this is not described in the above embodiment, it is preferred that the operator set a breaker of the heater  162  to OFF beforehand when performing the operation for switching the operating mode. More preferably, the operator sets the set temperature of the heater  162  to 0° C. beforehand when performing the operation for switching the operating mode. 
     In the bag-making and packaging apparatus pertaining to this example modification, the safety of the operator is further ensured. It will be noted that these settings relating to the heater may also be automatically set by the control unit  300  at the same time that the operating mode is switched to the non-auto-feeding mode. 
     (6-3) Example Modification C 
     Although this is not described in the above embodiment, it is preferred that when the control unit  300  judges that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning, the control unit  300  notify the operator, using the liquid crystal display  96  for example, that at least one of the film feeding unit  100  and the splicing device  160  is malfunctioning. 
     According to this configuration, the operator can promptly switch the operating mode to the non-auto-feeding mode. For this reason, a reduction in the productivity of the bag-making and packaging apparatus is further inhibited. 
     (6-4) Example Modification D 
     In the above embodiment, the bag-making and packaging apparatus  1000  equipped with the control unit  300  that stops the auto-feeding function and executes the non-auto-feeding mode when it judges that at least one of the first holding mechanism motor  114   a , the second holding mechanism motor  114   b , the frame rotation motor  138 , the photoelectric sensors  408 A,  408 B, the pinch roller  168 , the heater  162 , and the knife  166  is malfunctioning was described. However, examples of the control by the control unit  300  are not limited to this. 
     For example, the control unit  300  may also execute the non-auto-feeding mode in a case where a part that configures the film feeding unit  100  or the splicing device  160  but does not correspond to the above parts is malfunctioning. 
     Consequently, the control unit  300  may also execute the non-auto-feeding mode in a case where, for example, the first holding mechanism  110   a  is malfunctioning. Alternatively, the control unit  300  may also execute the non-auto-feeding mode in a case where the frame rotation transmission mechanism  137  is malfunctioning. Alternatively, the control unit  300  may also execute the non-auto-feeding mode in a case where the first clamp  163  is malfunctioning. 
     (6-5) Example Modification E 
     In the above embodiment, the bag-making and packaging apparatus  1000  equipped with the control unit  300  that stops the auto-feeding function and executes the non-auto-feeding mode when it judges that at least one of the first holding mechanism motor  114   a , the second holding mechanism motor  114   b , the frame rotation motor  138 , the photoelectric sensors  408 A,  408 B, the pinch roller  168 , the heater  162 , and the knife  166  is malfunctioning was described. However, examples of the control by the control unit  300  are not limited to this. For example, the control unit  300  can stop the auto-feeding function and execute the non-auto-feeding mode even in a case where it judges that a part other than those described above is malfunctioning. Specifically, the control unit  300  may also execute the non-auto-feeding mode in a case where a circuit board or the like of the microcomputer that the control unit  300  has is malfunctioning and the control unit  300  cannot control operation relating to the auto-feeding function. 
     (7) OTHER EMBODIMENTS 
     An embodiment of the bag-making and packaging apparatus pertaining to the invention has been described above, but it will be understood that various changes in the form and details may be made without departing from the spirit and scope of the claims. 
     The invention is not limited to the above embodiment as is. The invention can be embodied by modifying its constituent elements at the stage of implementation to the extent that doing so does not depart from the spirit of the invention. Furthermore, various inventions can be formed by appropriate combinations of multiple constituent elements disclosed in the above embodiment. For example, some constituent elements may be omitted from all the constituent elements described in the embodiment. Moreover, the constituent elements may be combined as appropriate with different embodiments. Therefore, this embodiment is to be construed as merely illustrative and not limited in any way, and thus any modifications apparent to one skilled in the art are intended to be included in the embodiment. 
     This invention can be widely applied to bag-making and packaging apparatus and is useful. 
     REFERENCE SIGNS LIST 
     
         
           96   a  Operating Mode Switching Unit 
           100  Film Feeding Unit 
           114   a  First Holding Mechanism Motor (motor that rotates film roll) 
           114   b  Second Holding Mechanism Motor (motor that rotates film roll) 
           138  Frame Rotation Motor (motor that rotates frame that supports film roll holding units) 
           160  Splicing Device 
           162  Heater 
           166  Knife (Cutting Member) 
           168  Pinch Roller 
           200  Bag-making and Packaging Unit 
           300  Control Unit 
           408 A Photoelectric Sensor (sensor that detects posture of frame that supports film roll holding units) 
           408 B Photoelectric Sensor (sensor that detects posture of frame that supports film roll holding units) 
           1000  Bag-making and Packaging Apparatus 
         F Film 
         FR Film Rolls