Abstract:
In a suction nozzle  66  which sucks and holds a component  150  on a suction surface by using negative pressure air and detaches the sucked and held component from the suction surface by using positive pressure air, the positive pressure air and the negative pressure air used when the component is held and detached selectively flow through through-holes  90, 94  and  96 , air flow path  116 , or the like. In addition, a rod  110  is held to be capable of being advanced and retracted toward the suction surface in an inside section of the suction nozzle. The rod protrudes from the suction surface by the positive pressure air flowing through the air flow path and is retracted to the inside section of the suction nozzle when the negative pressure flows through the air flow path. In other words, the through-hole, the air flow path, or the like is shared as a mechanism for moving the rod and a mechanism for sucking and holding the component by the suction nozzle. Accordingly, it is possible to make the device compact, simple or the like and to improve practicality of the suction nozzle.

Description:
TECHNICAL FIELD 
       [0001]    The present application relates to a suction nozzle which sucks and holds a component on a suction surface by using negative pressure air and detaches the sucked and held component from the suction surface by using positive pressure air. 
       BACKGROUND ART 
       [0002]    Normally, a suction nozzle can perform mounting work of a component on a circuit substrate by sucking and holding a component by a negative pressure and detaching the component by a positive pressure. The component includes a high adhesive component, for example, made of rubber material or the like and in a case where the high adhesive component is sucked and held by the suction nozzle, there is a case where the high adhesive component is stuck to the suction nozzle and thus is unlikely to be detached from the suction nozzle. In addition, even in a component other than the high adhesive component, there is a case where the component is stuck to the suction nozzle by static electricity or the like and thus is unlikely to be detached from the suction nozzle. In the related art, PTL 1 discloses a suction nozzle in which a pusher moving in an up-down direction is installed on a side thereof and by which the sucked and held component is forcibly detached by the pusher. 
         [0003]    PTL 1: JP-A-2001-25988 
       SUMMARY 
       [0004]    According to the suction nozzle described in PTL 1, a component can be reliably detached from the suction nozzle. However, in the suction nozzle described in PTL 1, there is a concern that the entirety of the device becomes large and complicated since a mechanism which moves the pusher and a mechanism which sucks and holds the component by the suction nozzle are individually installed. Accordingly, there is a lot of room for improvement in the suction nozzle which can reliably detach the component, and practicality can be improved by performing various improvements. The disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a suction nozzle having high practicality. 
         [0005]    In order to solve the problem described above, in the disclosure, a suction nozzle which sucks and holds a component on a suction surface by using negative pressure air and detaches the sucked and held component from the suction surface by using positive pressure air includes an air flow path through which the positive pressure air and the negative pressure air selectively flow; and a movable member which is held to be capable of being advanced and retracted toward the suction surface in an inside section of the suction nozzle. The movable member protrudes from the suction surface by the positive pressure air flowing through the air flow path and is retracted to the inside section of the suction nozzle when the negative pressure air flows through the air flow path. 
       Advantageous Effects 
       [0006]    In the suction nozzle described in the disclosure, the positive pressure air and the negative pressure air used when the component is held and detached selectively flow through the air flow path. In addition, the movable member is held in the inside section of the suction nozzle so as to be capable of being advanced and retracted toward the suction surface. The movable member protrudes from the suction surface by positive pressure air flowing through the air flow path, and is retracted to the inside section of the suction nozzle when negative pressure air flows through the air flow path. In other words, in the suction nozzle described in the disclosure, the air flow path is shared as a mechanism which moves the movable member and a mechanism which sucks and holds the component by the suction nozzle. Accordingly, it is possible to make the device compact, simple or the like and to improve practicality of the suction nozzle. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0007]      FIG. 1  is a perspective view illustrating a component mounting apparatus. 
           [0008]      FIG. 2  is a perspective view illustrating a component mounting device of the component mounting apparatus. 
           [0009]      FIG. 3  is a cross-sectional view illustrating a suction nozzle. 
           [0010]      FIG. 4  is a cross-sectional view illustrating the suction nozzle in a state where a component is sucked and held. 
           [0011]      FIG. 5  is a cross-sectional view illustrating the suction nozzle in a state where the component is detached. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0012]    Hereinafter, an embodiment of the disclosure will be described in detail with reference to the drawings as an aspect for carrying out the disclosure. 
       Configuration of Component Mounting Apparatus 
       [0013]      FIG. 1  illustrates a component mounting apparatus  10 . The component mounting apparatus  10  is an apparatus which performs mounting work of a component on a circuit substrate  12 . The component mounting apparatus  10  includes an apparatus main body  20 , a substrate conveyance and holding device  22 , a component mounting device  24 , imaging devices  26  and  28 , a component supply device  30 , and a bulk component supply device  32 . An example of circuit substrate  12  includes a circuit board, a substrate having a three-dimensional structure, or the like, and an example of a circuit board includes a printed-wiring board, a printed-circuit board, or the like. 
         [0014]    The apparatus main body  20  is configured by a frame section  40  and a beam section  42  which is suspended over the frame section  40 . The substrate conveyance and holding device  22  is installed in a center in a front-back direction of the frame section  40 , and includes a conveyance device  50  and a clamping device  52 . The conveyance device  50  is a device which conveys the circuit substrate  12 , and the clamping device  52  is a device which holds the circuit substrate  12 . Accordingly, the substrate conveyance and holding device  22  conveys the circuit substrate  12  and fixedly holds the circuit substrate  12  at a predetermined position. In the following description, a conveyance direction of the circuit substrate  12  is referred to as an X-direction, a horizontal direction perpendicular to the direction thereof is referred to as an Y-direction, and a vertical direction is referred to as a Z-direction. In other words, a width direction of the component mounting apparatus  10  is the X-direction, and the front-back direction thereof is the Y-direction. 
         [0015]    The component mounting device  24  is installed in the beam section  42 , and includes two work heads  60  and  62  and a work head moving device  64 . A suction nozzle (see  FIG. 2 )  66  is provided on a lower end face of each of the work heads  60  and  62  to be attachable to and detachable from the lower end face thereof. The suction nozzle  66  communicates with a positive and negative pressure supply device (not illustrated) via an air flow path. The suction nozzle  66  sucks and holds the component by the negative pressure, and detaches the held component by the positive pressure. In addition, the work head moving device  64  includes an X-direction moving device  68 , a Y-direction moving device  70 , and a Z-direction moving device  72 . By the X-direction movement device  68  and the Y-direction moving device  70 , the two work heads  60  and  62  are integrally moved to an arbitrary position on the frame section  40 . In addition, as illustrated in  FIG. 2 , each of the work heads  60  and  62  is mounted to be attachable to and detachable from sliders  74  and  76 , and the Z-direction moving device  72  individually moves the sliders  74  and  76  in the up-down direction. In other words, the work heads  60  and  62  are individually moved in the up-down direction by the Z-direction moving device  72 . 
         [0016]    The imaging device  26  is attached to the slider  74  in a state of facing downward, and is moved along with the work head  60  in the X-direction, the Y-direction, and the Z-direction. Accordingly, the imaging device  26  images the arbitrary position on the frame section  40 . As illustrated in  FIG. 1 , the imaging device  28  is installed between the substrate conveyance and holding device  22  on the frame section  40  and the component supply device  30  in a state of facing upward. Accordingly, the imaging device  28  images the component held by the suction nozzles  66  of the work heads  60  and  62 . 
         [0017]    The component supply device  30  is installed at an end section of a side of the frame section  40  in the front-back direction. The component supply device  30  includes a tray-type component supply device  78  and a feeder-type component supply device (not illustrated). The tray-type component supply device  78  is a device for supplying a component which is in a state of being placed on a tray. The feeder-type component supply device is a device for supplying a component by a tape feeder (not illustrated). 
         [0018]    The bulk component supply device  32  is installed at an end section of the other side of the frame section  40  in the front-back direction. The bulk component supply device  32  is a device which aligns multiple components which are in a state of being scattered separately and supplies the components which are in an aligned state. In other words, the bulk component supply device is a device which aligns the multiple components which are in arbitrary postures in a predetermined posture and supplies the components which are in the predetermined posture. Examples of components supplied by the component supply device  30  and the bulk component supply device  32  include an electronic circuit component, a constituent component of a solar cell, a constituent component of the power module, or the like. In addition, the electronic circuit component includes a component having a lead, a component without a lead, or the like. 
       Operation of Component Mounting Apparatus 
       [0019]    In the component mounting apparatus  10 , the mounting work of the component is performed on the circuit substrate  12  held by the substrate conveyance and holding device  22  using the configuration described above. Specifically, the circuit substrate  12  is conveyed to a working position and is fixedly held by the clamping device  52  at the position. Next, the imaging device  26  moves above the circuit substrate  12  to image the circuit substrate  12 . Accordingly, information on errors of the holding position of the circuit substrate  12  is obtained. In addition, the component supply device  30  or the bulk component supply device  32  supplies components to a predetermined supply position. Any of the work heads  60  and  62  moves above the supply position of the component and holds the component by using the negative pressure by the suction nozzle  66 . Subsequently, the work heads  60  and  62  holding the component move above the imaging device  28 , and the imaging device  28  images the component held by the suction nozzles  66 . Accordingly, the information on the errors of the holding position of the component is obtained. Subsequently, the work heads  60  and  62  holding the component move above the circuit substrate  12 , and correct the error of the holding position of the circuit substrate  12 , the error of the holding position of the component, or the like. The component is mounted on the circuit substrate  12  by the suction nozzle  66  detaching the component using the positive pressure. 
       Structure of Suction Nozzle 
       [0020]    As described above, the mounting work is performed by the suction nozzle  66  sucking and holding the component by negative pressure and detaching the component by positive pressure in the component mounting apparatus  10 . However, the component mounted on the circuit substrate  12  includes a high adhesive member, for example, a member using rubber materials or the like and in a case where the high adhesive member is held by the suction nozzle  66 , there is a case where the member is stuck to the suction nozzle  66  and thus is unlikely to be detached from the suction nozzle  66 . In addition, even in a component in which the high adhesive member is not used, there is a case where the component is stuck to the suction nozzle  66  by static electricity or the like and thus is unlikely to be detached from the suction nozzle  66 . In view of such circumstances, a member protruding from the suction surface of the suction nozzle  66  when the positive pressure air is supplied to the suction nozzle  66  is provided in the suction nozzle  66 , and the component sucked and held to the suction nozzle  66  is forcibly detached from the suction nozzle by this member. Hereinafter, a specific structure of the suction nozzle  66  will be described. 
         [0021]    As illustrated in  FIG. 3 , the suction nozzle  66  includes an adapter  80  and a nozzle main body  82 . The adapter  80  includes an adapter main body section  84 , a flange section  86 , and an expansion and contraction section  88 . The adapter main body section  84  generally has a cylindrical shape and a through-hole  90  penetrating in the up-down direction is formed in the adapter main body section  84 . The through-hole  90  has a stepped shape in which an inner diameter of a portion of an upper side thereof is larger than that of a portion of a lower side thereof, and a stepped surface  92  in a state of facing upward is formed in an inside section of the through-hole  90 . 
         [0022]    The flange section  86  is fixed to the upper end surface of the adapter main body section  84  so as to extend in a radial direction of the adapter main body section  84 , and a through-hole  94  communicating with the through-hole  90  of the adapter main body section  84  is formed on the flange section  86 . In addition, the expansion and contraction section  88  generally has a cylindrical shape and a through-hole  96  penetrating in the up-down direction is formed in the expansion and contraction section  88 . An outer diameter of the expansion and contraction section  88  is made slightly smaller than the inner diameter of the lower portion than the stepped surface  92  of the through-hole  90 , and the expansion and contraction section  88  is inserted into the through-hole  90 . In addition, an upper end section of the expansion and contraction section  88  extends to an upper portion than the stepped surface  92  of the through-hole  90  and a lower end section of the expansion and contraction section  88  extends from the lower end section of the adapter main body section  84 . Accordingly, by the adapter main body section  84  and the expansion and contraction section  88  moving relative to each other, the extension amount of the expansion and contraction section  88  from the lower end section of the adapter main body section  84  changes, and the adapter  80  expands and contracts. A protruding section  98  protruding in the radial direction is formed on the upper end section of the expansion and contraction section  88 . Accordingly, when the expansion and contraction section  88  moves downward, the protruding section  98  engages the stepped surface  92  of the through-hole  90  to prevent the expansion and contraction section  88  from coming off from the through-hole  90 . 
         [0023]    In addition, the nozzle main body  82  includes a support member  100 , a flow path forming member  102 , a suction pad  104 , a guide member  106 , a rod pressing member  108 , and a rod  110 . The support member  100  generally has a cylindrical shape having a lid, and a through-hole  112  is formed in a center of a lid section thereof. The lower end section of the expansion and contraction section  88  of the adapter  80  is fixedly fitted in the through-hole  112 . A coil spring  114  is installed in a compressed state between the support member  100  and the adapter main body section  84  of the adapter  80 . Accordingly, the support member  100  is biased downward. In addition, a lower end section of the support member  100  is open in a trumpet shape. In other words, a peripheral wall of a lower end section of the support member  100  spreads outward, as going downward. 
         [0024]    The flow path forming member  102  generally has a cylindrical shape having a bottom, and an outer diameter of the flow path forming member  102  is slightly smaller than an inner diameter of the support member  100 . The flow path forming member  102  is inserted into an inside section of the support member  100  from a lower side of the support member  100 . Accordingly, the flow path forming member  102  slides in the up-down direction in the inside section of the support member  100 . In addition, a coil spring  115  is installed in a compressed state between a bottom section of the flow path forming member  102  and the lid section of the support member  100 . Accordingly, the flow path forming member  102  is biased downward. A stopper (not illustrated) is provided on an inner peripheral surface of the support member  100 , and a downward movement of the flow path forming member  102  is restricted by the stopper. Incidentally, in  FIG. 3 , the flow path forming member  102  is illustrated in a state where the downward movement is restricted by the stopper. 
         [0025]    In addition, a peripheral wall section and a bottom section of the flow path forming member  102  are made thick, and the air flow path  116  is formed in the peripheral wall section and the bottom section thereof. Specifically, multiple first flow paths (two first flow paths are illustrated in the figure)  118  are formed in the peripheral wall section of the flow path forming member  102  so as to extend in the up-down direction. An upper end of a first flow path  118  opens at an upper end of the flow path forming member  102 , and a lower end of the first flow path  118  is not opened to the lower end of the flow path forming member  102 , and the first flow path extends to the middle of the bottom section of the flow path forming member  102 . On the other hand, multiple second flow paths  120  are formed on the bottom section of the flow path forming member  102  corresponding to the multiple first flow paths  118 . The second flow path  120  is inclined and communicates with the lower end of the corresponding first flow path  118  at the upper end thereof. The lower end of the second flow path  120  opens to the center section of the bottom face of the flow path forming member  102 . The lower ends of the multiple second flow paths  120  are open to the same portion of the bottom face of the flow path forming member  102 . Further, a through-hole  121  penetrating in the up-down direction is formed in the center section of the bottom section of the flow path forming member  102 , and a lower end of the through-hole  121  is opened to the same position as the lower end of the multiple second flow paths  120 . In other words, the lower end of the multiple second flow paths  120  and the lower end of the through-hole  121  are opened to one position of the bottom face of the flow path forming member  102 . 
         [0026]    The suction pad  104  is formed of an elastically deformable material and generally has a short cylindrical column shape. The suction pad  104  is fixed to the lower end face of the flow path forming member  102 , and a through-hole  122  penetrating in the up-down direction is formed in the suction pad  104 . The upper end of the through-hole  122  communicates with the lower end of the second flow path  120  of the flow path forming member  102 . In addition, a recessed section  124  is formed on the lower end face of the suction pad  104 . The recessed section  124  is formed such that an outer edge section  126  of the lower end face of the suction pad  104  is a thin wall over an entire circumference thereof, and the outer edge section  126  spreads outward, as going downward. In other words, the outer edge section  126  is open in a trumpet shape. Although a portion of an upper side of the flow path forming member  102  is positioned in an inside section of the support member  100 , the portion of the lower side of the flow path forming member  102 , that is, the outer edge section  126  extends from the lower side of the support member  100 . In addition, an outer diameter of the lower end of the outer edge section  126  is slightly smaller than the outer diameter of the lower end of the support member  100 , and the outer edge section  126  and the lower end of the support member  100  are separated from each other. 
         [0027]    The guide member  106  generally has a cylindrical shape, and the outer diameter of the guide member  106  is smaller than the inner diameter of the flow path forming member  102 . The guide member  106  is fixed in a state of being erected on the bottom section of the flow path forming member  102 . 
         [0028]    The rod pressing member  108  generally has a cylindrical shape having a lid, and an outer diameter of the rod pressing member  108  is slightly smaller than the inner diameter of the guide member  106 . A portion of a lower side of the rod pressing member  108  is inserted into the inside section of the guide member  106  from an upper side of the guide member  106  and the rod pressing member  108  is slid in the up-down direction at the inside section of the guide member  106  in the inserted section. In addition, a recessed section  128  is formed in an upper end surface of the rod pressing member  108  so as to face the through-hole  112  of the support member  100 . The recessed section  128  is formed so as to extend in the radial direction of the rod pressing member  108  and reaches an outer peripheral surface of the rod pressing member  108 . In other words, the recessed section  128  opens to the upper end surface and the outer peripheral surface of the rod pressing member  108 . 
         [0029]    The rod  110  generally has a bar shape, the outer diameter thereof is slightly smaller than the inner diameter of the through-hole  121  of the flow path forming member  102  and is smaller than the inner diameter of the through-hole  122  of the suction pad  104 . The rod  110  is accommodated in the inside sections of the guide member  106  and the rod pressing member  108  in the portion of the upper side thereof, is inserted into the through-hole  121  of the flow path forming member  102  at the center section thereof, and extends to the inside section of the through-hole  122  of the suction pad  104  in the portion of the lower side thereof. Accordingly, the rod  110  slides in the through-hole  121  of the flow path forming member  102 , and the lower end section of the rod  110  moves in the up-down direction in the inside section of the through-hole  122  of the suction pad  104 . 
         [0030]    In addition, a flange section  130  is formed on the upper end of the rod  110 , and a coil spring  132  is installed in a compressed state between the flange section  130  and the bottom section of the flow path forming member  102 . Accordingly, the rod  110  is biased upward. By the rod  110  being biased upward, the upper end of the rod  110  is in contact with the lid section of the rod pressing member  108  and the rod pressing member  108  is also biased along with the rod  110  upward. Therefore, the lid section of the rod pressing member  108  is in contact with the lid section of the support member  100  and covers the through-hole  112 . However, in the lid section of the rod pressing member  108 , the recessed section  128  which opens to the upper end surface and the outer peripheral surface thereof is formed and thus even if the lid section of the rod pressing member  108  covers the through-hole  112 , the through-hole  112  and the inside of the support member  100  communicate with each other via the recessed section  128 . 
         [0031]    In addition, in a state where downward movement of the flow path forming member  102  is restricted by the stopper and the rod pressing member  108  is in contact with the lid section of the support member  100 , the lower end of the rod  110  is positioned a predetermined distance a above the lower end of the through-hole  122  of the suction pad  104 . The predetermined distance a is longer than a distance which the flow path forming member  102  is movable in the inside of the support member  100 , that is, a distance between the flow path forming member  102  (flow path forming member  102  in  FIG. 3 ) of which downward movement is restricted by the stopper and the flow path forming member  102  (flow path forming member  102  in  FIG. 4 ) which is moved to the uppermost position against an elastic force of the coil spring  115 . 
         [0032]    In the suction nozzle  66  structured as described above, when the suction pad  104  is pressed against the component (see  FIG. 4 )  150  to be held, the outer edge section  126  of the suction pad  104  is in contact with the component  150  and elastically deforms. Accordingly, the inside section of the recessed section  124  of the suction pad  104  is sealed. In this state, when negative pressure air is supplied to the through-holes  90 ,  94 , and  96  of the adapter  80 , that is, when air is sucked from the through-holes  90 ,  94 , and  96  of the adapter  80 , the air in the inside section of the support member  100  is sucked via the through-hole  112  of the support member  100  and the recessed section  128  of the rod pressing member  108 . At this time, air is sucked from the air flow path  116  of the flow path forming member  102 , the through-hole  122  of the suction pad  104 , the inside section of the recessed section  124 , and the component is sucked and held on the outer edge section  126  of the suction pad  104 . 
         [0033]    Further, when air is sucked from the inside section of the support member  100 , as illustrated in  FIG. 4 , the flow path forming member  102  moves upward against the elastic force of the coil spring  115 , and the suction pad  104  also moves upward along with the flow path forming member  102 . At this time, the upper surface of the outer edge section  126  of the suction pad  104  is in contact with the lower end of the support member  100 , and the outer edge section  126  is supported by the lower end of the support member  100  from the upper face side. Accordingly, because the outer edge section  126  elastically deformed by suction and holding of the component  150  is supported from the upper face side, the elastic deformation of the outer edge section  126  is suppressed and suction and holding of the component  150  is secured by the suction pad  104 . 
         [0034]    Although the rod  110  relatively moves downward with respect to the flow path forming member  102  and the suction pad  104  according to upward movement of the flow path forming member  102  and the suction pad  104 , the lower end of the rod  110  is positioned above the lower end of the opening of the through-hole  122  of the suction pad  104  since the predetermined distance a described above is longer than the movement amount of the flow path forming member  102 . Therefore, regardless of the relative downward movement of the rod  110 , the suction nozzle  66  sucks and holds the component  150  appropriately. 
         [0035]    In addition, in the suction nozzle  66 , when the sucked and held component  150  is detached from the suction nozzle  66 , supply of negative pressure air to the through-holes  90 ,  94 , and  96  of the adapter  80  is stopped and the positive pressure air is supplied to the through-holes  90 ,  94 , and  96  of the adapter  80 . Air is blown into the inside section of the support member  100  via the through-hole  112  of the support member  100  and the recessed section  128  of the rod pressing member  108 , by supply of positive pressure air to the through-holes  90 ,  94 , and  96  of the adapter  80 . At this time, air is blown into the air flow path  116  of the flow path forming member  102 , the through-hole  122  of the suction pad  104  and the inside section of the recessed section  124 . 
         [0036]    In addition, as illustrated in  FIG. 5 , the flow path forming member  102  moves downward and the suction pads  104  also move downward along with the flow path forming member  102  in the inside section of the support member  100  by the elastic force of the coil spring  115 . Further, the rod pressing member  108  moves downward, and the rod  110  moves downward against the elastic force of the coil spring  132  along with the rod pressing member  108 , by the air blown from the through-hole  112  of the support member  100 . Accordingly, the lower end of the rod  110  further moves downward than the lower end of the outer edge section  126  of the suction pad  104 , and is in contact with the component  150 . 
         [0037]    Accordingly, when positive pressure air is supplied to the suction nozzle, air is blown into the inside section of the recessed section  124  of the suction pad  104 , the rod  110  descends, and the lower end of the rod  110  is in contact with the component  150 . Accordingly, even when the component  150  is in close contact with the outer edge section  126  of the suction pad  104  and the component  150  is unlikely to be detached from the suction pad  104 , the component  150  can be securely detached. 
         [0038]    Incidentally, in the embodiment, the suction nozzle  66  is an example of a suction nozzle. The through-hole  90  is an example of an air flow path. The through-hole  94  is an example of an air flow path. The through-hole  96  is an example of an air flow path. The support member  100  is an example of a support member. The suction pad  104  is an example of a suction pad. The rod  110  is an example of a movable member. The through-hole  112  is an example of an air flow path. The air flow path  116  is an example of an air flow path. The through-hole  122  is an example of an air flow path. The recessed section  128  is an example of an air flow path. 
         [0039]    The present disclosure is not limited to the embodiments described above, and can be implemented in various aspects in which various modifications and improvements are made based on knowledge of those skilled in the art. Specifically, for example, in the embodiment, the lower end of the support member  100  and the outer edge section  126  of the suction pad  104  are normally separated from each other, and when negative pressure air is supplied to the suction nozzle  66 , the outer edge section  126  of the suction pad  104  is supported by the support member  100 , but the outer edge section  126  of the suction pad  104  may be always supported by the support member  100 , regardless of the supply of negative pressure air to the suction nozzle  66 . 
       REFERENCE SIGNS LIST 
       [0040]      66 : suction nozzle,  90 : through-hole (air flow path),  94 : through-hole (air flow path),  96 : through-hole (air flow path),  100 : support member,  104 : suction pad,  110 : rod (movable member),  112 : through-hole (air flow path),  116 : air flow path,  122 : through-hole (air flow path),  128 : recessed section (air flow path)