Patent Publication Number: US-7913988-B2

Title: Crease forming apparatus as well as post processing apparatus and recording member processing apparatus respectively using the same crease forming apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based on and claims priority under 35 USC 119 from Japanese Patent Applications No. 2008-005121 filed Jan. 14, 2008 and No. 2008-005122 filed Jan. 14, 2008. 
     BACKGROUND 
     1. Technical Field 
     The present invention relates to a crease forming apparatus as well as a post processing apparatus and a recording member processing apparatus respectively using the same crease forming apparatus. 
     2. Related Art 
     For a recording member processing apparatus and a post processing apparatus for enforcing a post processing on a recording member, a crease forming apparatus which is used to form a crease in the recording member is proposed. 
     SUMMARY 
     According to an aspect of the invention, a crease forming apparatus for forming a crease along a given line in a recording member, includes a crease forming member, an insertion groove and hold members, a drive unit. The crease forming member extends along the given line of the recording member for forming the crease in the given line of the recording member. The insertion groove is formed in a portion disposed opposed to the crease forming member and that allows insertion of the crease forming member thereinto. The hold members are disposed with the crease forming member therebetween and that holds the recording member from both sides of the recording member with respect to the given line in a state (i) where the given line of the recording member is set between the crease forming member and the insertion groove and (ii) where the recording member is situated at a wait position in which the leading end of the crease forming member does not project from the position of the recording member. The drive unit drives the crease forming member in such a manner that the crease forming member advances and retreats between the wait position and a crease forming position for forming the crease in the recording member, and that, in a state where the recording member is held by the hold members, inserts the crease forming member situated at the wait position into the insertion groove up to the crease forming position against the holding force to the recording member by the hold members in such a manner that a peripheral portion of the given line of the recording member is set along the crease forming member. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiment(s) of the present invention will be described in detail based on the following figures, wherein: 
         FIG. 1A  and  FIG. 1B  show the outline of a crease forming apparatus according to an exemplary embodiment model in which the invention is embodied; Specifically,  FIG. 1A  is an explanatory view of the crease forming apparatus, showing a state before a crease is formed, and  FIG. 1B  is an explanatory view of the crease forming apparatus, showing a state when a crease is being formed; 
         FIG. 2A  is an explanatory view of the crease forming principle of the crease forming apparatus according to the exemplary embodiment model, and  FIG. 2B  is an explanatory view of the crease forming principle of a crease forming apparatus according to a comparison model; 
         FIG. 3A  is an explanatory view of the outline of the crease forming apparatus according to the exemplary embodiment model in which the invention is embodied, and  FIG. 3B  is an explanatory view of a typical exemplary embodiment of drive unit used in the crease forming apparatus; 
         FIG. 4A  is an explanatory view of a crease forming process to be carried out by the crease forming apparatus according to the exemplary embodiment model shewn in  FIGS. 1A and 1B , and  FIG. 4B  is an explanatory view of a state where a crease is formed in a recording member; 
         FIG. 5  is an explanatory view of the whole structure of a recording member processing apparatus according to an exemplary embodiment 1 to which the invention is applied; 
         FIG. 6  is an explanatory view of a post processing apparatus used in the recording member processing apparatus shown in  FIG. 5 ; 
         FIG. 7A  is an explanatory view of the outline of a positioning and storing receiver and an edge stapling device respectively used in the exemplary embodiment 1, and  FIG. 7B  is an explanatory view of a section taken along the B-B line shown in  FIG. 7A ; 
         FIG. 8  is an explanatory view of the position relationship of the edge stapling device used in the exemplary embodiment 1; 
         FIG. 9  is an explanatory view of the outline of a saddle stapling device and a discharge and storage receiver respective used in the exemplary embodiment 1; 
         FIG. 10  is an arrow mark view of the saddle stapling device and discharge and storage receiver, when viewed from the direction of the line VIII shown in  FIG. 9 ; 
         FIG. 11A  is an explanatory view of the outline of a crease forming apparatus used in the exemplary embodiment 1, and  FIGS. 11B and 11C  are respectively an explanatory view of a state where a crease is formed by the crease forming apparatus shown in  FIG. 11A ; 
         FIG. 12  is an explanatory perspective view of the details of the crease forming apparatus used in the exemplary embodiment 1; 
         FIG. 13  is an explanatory perspective view of the crease forming apparatus shown in  FIG. 12 , when viewed from another direction; 
         FIG. 14  is an explanatory front view of the crease forming apparatus shown in  FIG. 12 ; 
         FIG. 15  is an explanatory perspective view of the crease forming apparatus shown in  FIG. 12 , showing a state where an upper frame and a groove forming member are removed therefrom; 
         FIG. 16  is an explanatory perspective view of the crease forming apparatus shown in  FIG. 15 , showing a state where a crease forming unit is further removed therefrom; 
         FIG. 17  is an explanatory perspective view of the crease forming apparatus shown in  FIG. 16 , when viewed from the bottom surface side thereof; 
         FIG. 18  is an explanatory view of the whole structure of a crease forming unit used in the exemplary embodiment 1; 
         FIG. 19  is a view of the crease forming unit shown in  FIG. 18 , when viewed from the bottom surface side thereof; 
         FIG. 20  is an explanatory view of a state where an eccentric cam used in a lift device of the crease forming apparatus is situated at its bottom dead center; 
         FIG. 21  is an explanatory view of a state where a hold block used in the lift device of the crease forming apparatus is contacted with a groove forming block; 
         FIG. 22  is an explanatory view a state where the eccentric cam of the lift device of the crease forming apparatus is situated at its top dead center; 
         FIG. 23  is an explanatory view of the position relationship between the respective eccentric cams of the lift device of the crease forming apparatus; 
         FIG. 24  is an explanatory view of the rotational operations of the respective eccentric cams of the lift device of the crease forming apparatus; 
         FIGS. 25A to 25C  are respectively explanatory views of operations to be carried out in the processes I to III of a crease forming processing to be executed by the crease forming apparatus, and  FIG. 25D  is an explanatory view of an example of a state of a processing for forming a crease in a recording member in each of the processes; 
         FIGS. 26A and 26B  show the contents of a crease forming processing to be carried out by the crease forming apparatus. Specifically,  FIG. 26A  is an explanatory view of a state before the crease forming processing is carried out, and  FIG. 26B  is an explanatory view of a state when the crease forming processing being carried cut; 
         FIG. 27  is an explanatory view of a modification of the crease forming unit; 
         FIG. 28  is an explanatory exploded view of the crease forming unit shown in  FIG. 27 ; 
         FIG. 29  is an explanatory view of a control system used in the exemplary embodiment 1; 
         FIG. 30  is a flow chart of recording member processing control processes in the control system shown in  FIG. 29 ; 
         FIG. 31  is an explanatory view of the processing contents of the respective parts in a crease forming mode; 
         FIG. 32  is an explanatory view of the processing contents of the respective parts in an edge stapling mode; 
         FIGS. 33A and 33B  are respectively explanatory views of the processing contents of the respective parts in a saddle stapling mode; and 
         FIG. 34A  is an explanatory view of the evaluation of the crease forming processing made conducted on a simple exemplary embodiment model while the dimension parameters of the respective parts are set variable, and  FIG. 34B  is an explanatory view of the outline of the simple exemplary embodiment model. 
     
    
    
     DETAILED DESCRIPTION 
     Firstly, description will be given below of the outline 1 of a mode for embodying the invention. 
     Outline 1 of the Exemplary Embodiment of the Invention 
     A crease forming apparatus according to the present exemplary embodiment, as shown in  FIGS. 1A and 1B , is used to form a crease along a given line in a recording member  5  and includes: a crease forming member  1  extending along the given line of the recording member  5  and capable of forming a crease along the given line of the recording member  5 ; an insertion groove  2  which is formed in a portion opposed to the crease forming member  1  and into which the crease forming member  1  can be inserted; two hold members  3  respectively disposed with the crease forming member  1  between them and, in a state where the given line of the recording member  5  is positioned between the crease forming member  1  and insertion groove  2  and also the leading end of the crease forming member  1  is situated at a wait position H where the leading end of the crease forming member  1  does not project from the position of the recording member  5 , for holding a portion where the given line of the recording member  5  is sandwiched; drive unit  4  for driving the crease forming member  1  between the wait position H and a crease forming position M where a crease is formed in the recording member, and also, in a state where the recording member  5  is held by the hold member  3 , for inserting the crease forming member  1  situated at the wait position H into the insertion groove  2  up to the crease forming position M against the holding force of the recording member  5  by the hold member  3  in such a manner that the peripheral portion of the given line of the recording member  5  can extend along the crease forming member  1 . 
     In the above technological unit, the crease to be formed in the recording member  5  by the crease forming apparatus, normally, is most formed in the central portion of the recording member  5 . However, the crease may also be formed in other portions than the central portion. 
     Also, the insertion groove  2  may have a bottom or may not. For example, in a case where the insertion groove has a bottom, the recording member  5  pushed into the crease forming member  1 , formally, may be contacted with the bottom of the insertion groove  2 . 
     Further, the wait position H of the crease forming member  1  must be a position where the leading end of the crease forming member  1  does not project from the recording member  5  position. If the leading end of the crease forming member  1  may project from the recording member  5  position, there is a fear that the leading end of the crease forming member  1  can interfere with the given line of the recording member  5  to thereby make it difficult to set the given line of the recording member  5  at a position which corresponds to the crease forming member  1 . 
     Also, as the hold member  3 , there may be used any type of hold member, provided that it can hold the portion sandwiching the crease forming portion of the recording member  5 . And, the hold member  3  may be driven by means which is provided separately from and independently of the drive unit  4 , or may be driven using the drive force of the drive unit  4 . 
     Still further, the drive unit  4  may be structured such that it can advance and retreat uniformly the entire area of the crease forming member in the longitudinal direction thereof, or may also be structured such that the crease forming members  1  are supported by a plurality of individual advance/retreat mechanisms and they are advanced and retreated individually by their associated individual advance/retreat mechanisms. 
     Yet further, the drive unit  4  may be structured such that it can advance and retreat the crease forming member  1  between the wait position H and crease forming position M; and, the crease forming position M may be set fixed or may be set such that it can be adjusted. Here, the wait position H is not limited to a position but it may also be set at two or more positions. 
     Also, as regards the drive unit  4 , the expression “in a state where the recording member  5  is held by the hold member  3 ” unit “simultaneously when or after the recording member  5  is held by the hold member  3 ”. 
     And, the expression “the crease forming member  1  is inserted - - - against the recording member  5  holding force by the hold member  3 ” unit “to enable an operation to push in the recording member  5  to which a tension is applied due to the insertion operation of the crease forming member  1 ”. 
     Further, according to the present exemplary embodiment, as shown in  FIG. 2A , where the thickness of the crease forming member  1  is expressed as m, the groove width of the insertion groove  2  is expressed as w and the insertion distance of the crease forming member  1  to the crease forming position M of the insertion groove  2  is expressed as k, a holding force applied by the crease forming member  1  may be a force which can push in the recording member  5 . In other words, it is not necessary that the holding force is so strong as to be able to form a crease in the recording member  5  in a state where the crease forming member  1  holds the recording member  5  between itself and the contact surface of the insertion groove  2 . Also, when the crease forming position M, where the crease forming member  1  forms a crease in the recording member  1 , is set sufficiently deep, it is also possible to form a crease in the recording member  5  easily. 
     Therefore, for example, when the thickness m of the crease forming member  1  to be used is set, even if the groove width w of the insertion groove  2  and the insertion distance k of the crease forming member  1  are set in such a manner that they can vary to a certain degree, the peripheral portion of the crease of the recording member  5  held by the hold member  3  is pushed in a substantially V-shaped manner depending on the position relationship between the position of the entrance edge, namely, the edge portion of the insertion groove  2  and the position of the leading end of the crease forming member  1 , thereby being able to form a crease in the recording member  5  stably. 
     On the other hand, according to a comparison model (which includes a crease forming member  1  and a fit groove  2 ′ into which the crease forming member  1  can be fitted) shown in  FIG. 2A , it is necessary to press the crease forming member  1  against the groove bottom  2   a ′ of the fit groove  2 ′ in a state where the crease portion of the recording member  5  is sandwiched by the crease forming member  1  and the groove bottom  2   a ′. Therefore, when the thickness of the crease forming member  1  is expressed as m, the groove width of the fit groove  2 ′ is expressed as d and the insertion distance of the crease forming member  1  is expresses as k′, unless the relationship between these dimensions is adjusted with high precision, it is difficult to form a crease in the recording member  5 . 
     Also, the insertion groove  2  must have a groove width larger than a value to be provided as the sum of the thickness of the crease forming member  1  and twice the thickness of the recording member  5 . When the groove width w is selected as a sufficiently wide dimension, the insertion distance k of the crease forming member  1  may be secured large and a substantially V-shaped crease may be formed along the given line of the recording member  5 . In this case, when the insertion distance k of the crease forming member  1  is small, the bending angle of the crease forming portion becomes gentle, thereby raising a fear that a crease is difficult to form. 
     Also, the insertion groove  2  may not have a contact surface which, when the crease forming member  1  is inserted to the crease forming position M, holds the crease leading end of the recording member  5  between itself and the leading end of the crease forming member  1 . According to this structure, when the crease forming member  1  is inserted into the insertion groove  2 , there is no fear at all that the recording member  5  can be held strongly between the insertion groove  2  and crease forming member  1 . Therefore, even when the strength of the casing of the crease forming apparatus is reduced to a certain degree, favorably, it is difficult to raise a fear that the strength of the casing can run short. 
     Further, the insertion groove  2  may be structured such that it has a guide surface formed in the edge portion thereof and having a width dimension increasing toward the entrance of the insertion groove  2 , and also that the crease forming position M of the crease forming member  1  is set at a position deeper than the guide surface. Here, the guide surface may have a linear shape or a curved shape; however, the shape of the guide surface may not have a corner portion as much as possible. When such smooth guide surface is set, the crease peripheral portion of the recording member  5  is disposed smoothly along the guide surface, thereby being able to avoid effectively the inconvenience that the crease peripheral portion of the recording member  5  can be damaged. 
     Also, the hold member  3 , may be structured that, when it does not hold the recording member  5 , it serves as a guide member for the recording member  5 . In this structure, on the surface of the hold member  3 , there may be formed a guide and feed surface which is used to guide and feed the recording member  5 . 
     Further, as an example of the drive unit  4 , in order to enhance the position precision of the crease and the stability of the crease in the crease forming processing to be carried out by the crease forming member  1 , there may be employed a method in which, after execution of the recording member  5  holding operation by the hold member  3 , the crease forming member  1  situated at the wait position H is inserted into the insertion groove  2  up to the crease forming position M. According to this example, there can be effectively eliminated an unfavorable phenomenon that, when the crease forming member  1  is inserted into the insertion groove  2 , the recording member  5  can be moved to thereby cause the crease forming position to vary. Also, there can be effectively avoided a trouble that proper tension cannot be applied to the recording member  5  and thus the crease can be weakened. 
     Still further, as an exemplary embodiment of the drive unit  4 , in order to stabilize the crease forming processing to be carried out by the crease forming member  1 , there may be employed a method in which, while the recording member  5  is held by the hold member  3 , the advancing and retreating operations of the crease forming member  1  with respect to the same recording member  5  are repeated two or more times. 
     Also, as an example of the drive unit  4 , in order to avoid the poor formation of the crease in the vicinity of the central portion of the crease forming member  1  in the longitudinal direction thereof, there may be employed a structure which includes: a plurality of individual advance/retreat mechanisms disposed at two or more portions of the crease forming member  1  in the longitudinal direction thereof and at least on both sides of the longitudinal direction center of the crease forming member  1 ; and, drive control unit for driving and controlling the crease forming member  1  in such a manner that it varies the timings of the moving operations of the crease forming member  1  to the crease forming position M carried out by the plurality of individual advance/retreat mechanisms from each other and it gives priority to the moving operations of the crease forming member  1  to the crease forming position M carried out by the individual advance/retreat mechanisms situated on both sides of the longitudinal direction center of the crease forming member  1 . 
     Here, the individual advance/retreat mechanisms may be disposed one at least on either side of the longitudinal direction center of the crease forming member  1 , or may be disposed two or more on such either side, or may be disposed in such a manner that they correspond to the longitudinal direction center of the crease forming member  1 . 
     According to the present exemplary embodiment, the drive control unit must satisfy the condition that it can vary the timings of the moving operations of the crease forming member  1  to the crease forming position by the plurality of individual advance/retreat mechanisms from each other and can give priority to the moving operations of the crease forming member  1  by the individual advance/retreat mechanisms situated on such both sides. This is the necessary conditions that, when forming a crease along the given line of the recording member  5 , a partial crease can be formed in the range of the end of the recording member  5  to the center thereof. 
     Especially, the drive unit  4  may include: a plurality of advance and retreat mechanisms disposed at two or more portions of the crease forming member  1  in the longitudinal direction thereof as well as in the longitudinal direction center of the crease forming member  1  and on both sides of such center; and, drive control unit for driving and controlling the crease forming member  1  in such a manner that it varies the timings of the moving operations of the crease forming member  1  to the crease forming position M carried out by the plurality of individual advance/retreat mechanisms from each other and it gives priority to the moving operations of the crease forming member  1  to the crease forming position M carried out by the individual advance/retreat mechanisms situated on both sides of the longitudinal direction center of the crease forming member  1  over the moving operations of the crease forming member  1  by the individual advance/retreat mechanism situated in the longitudinal direction center of the crease forming member  1 . 
     As a typical example of drive unit  4  of this type, there is available drive unit structured such that a plurality of individual advance/retreat mechanisms respectively include rotatable eccentric cams for advancing and retreating a crease forming member, and drive control unit sets the respective eccentric cams coaxial with each other while they are different in phase from each other and drives and rotates the respective eccentric cams. 
     Referring to this aspect, in a structure where the crease forming member  1  is moved uniformly to the crease forming position, there is a fear that the longitudinal direction center of the crease forming member  1  can be flexed. In this case, since the formation of the crease in the crease line of the recording member  5  becomes unstable, the strength of the casing of the crease forming apparatus must be set high. 
     Especially, a specific recording member  5  such as cardboard or coated paper provides a high bending strength and, when the bending strength of the specific recording member  5  is higher than the strength of the casing of the crease forming apparatus, the casing is strain deformed before a crease is formed in the specific recording member  5 , which makes it difficult to form the crease therein. Therefore, it is highly necessary to increase the strength of the casing in order to form a proper crease in the specific recording member  5 . 
     Here, a recording member  5  such as ordinary paper provides a bending strength which is normally lower than the strength of the casing and thus the casing is strain deformed after a crease is formed. Accordingly, there occurs little such a phenomenon as in the above-mentioned specific recording member  5  that the crease is difficult to form. 
     Next, description will be given below of the outline 2 of a mode for embodying the invention. 
     Outline 2 of the Exemplary Embodiment of the Invention 
     A crease forming apparatus according to the present exemplary embodiment, as shown in  FIGS. 3A and 3B , is used to form a crease along a given line in a recording member  5  and includes; a crease forming member  1  extending along the given line of the recording member  5  and capable of forming a crease along the given line of the recording member  5 ; an insertion groove  2  which is formed in a portion disposed opposed to the crease forming member  1  and into which the crease forming member  1  can be inserted; and, drive unit  4  which, in a state where the given line of the recording member  5  is set between the crease forming member  1  and the insertion groove  2 , drives, that is, advances and retreats the crease forming member  1  between a wait position H and a crease forming position M. Specifically, the drive unit  4  includes: a plurality of individual advance/retreat mechanisms  6  (for example,  6   a  to  6   c ) which are disposed at two or more portions of the crease forming member  1  in the longitudinal direction thereof and also on both sides of the longitudinal direction center C of the crease forming member  1 ; and, drive control unit  7  for driving and controlling the crease forming member  1  in such a manner that the timings of the moving operations of the crease forming member  1  to the crease forming position M by the plurality of individual advance/retreat mechanisms  6  are varied from each other and also priority is given to the moving operations of the crease forming member  1  by the individual advance/retreat mechanisms  6  ( 6   a ,  6   b ) respectively situated on both sides of the longitudinal direction center C of the crease forming member  1 . 
     Here, in the exemplary embodiment shown in  FIGS. 3A and 3B , there is shown an individual advance/retreat mechanism  8   c  which corresponds to the longitudinal direction center C of the crease forming member  1 . However, the present exemplary embodiment also includes a structure in which the individual advance/retreat mechanism  6   c  is not provided. 
     According to the present exemplary embodiment, especially, as shown in  FIGS. 3A and 3B , the drive unit  4  may include: a plurality of individual advance/retreat mechanisms  6  (for example,  6   a  to  6   c ) disposed at a plurality of portions of the crease forming member  1  in the longitudinal direction thereof as well as in the longitudinal direction center C of the crease forming member  1  and on both sides of the center C of the crease forming member  1 ; and, drive control unit  7  for driving and controlling the crease forming member  1  such that the timings of the moving operations of the crease forming member  1  to the crease forming position M by the plurality of individual advance/retreat mechanisms  6  are varied from each other and also more priority is given to the moving operations of the crease forming member  1  by the individual advance/retreat mechanisms  6  ( 6   a ,  6   b ) respectively situated on both sides of the longitudinal direction center C of the crease forming member  1  over the moving operation of the crease forming member  1  by the individual advance/retreat mechanism  6  (for example,  6   c ) disposed m the longitudinal direction center C of the crease forming member  1 . 
     In the above-mentioned technological unit, the creases to be formed in the recording member  5  by the crease forming apparatus, normally, are often formed in the center of the recording member  5  but the crease may also be formed in other portions of the recording member  5  than the center thereof. 
     Also, the insertion groove  2  may be structured such that the crease forming member  1  can be inserted into the insertion groove  2 . For example, it may also have a recessed portion which can be fitted with the insertion portion of the crease forming member  1 , or it may be a groove having such a wide width that allows the crease forming member  1  to be fitted with play. 
     Further, the insertion groove  2  may have a bottom or may not. 
     Here, as regards the relationship between the crease forming member  1  and insertion groove  2 , there may be employed a method in which the insertion groove  2  has a bottom and the crease forming member  1  is fitted into the insertion groove  2  to hold the recording member  5  between the crease forming member  1  and insertion groove  2  completely, thereby forming a crease. Or, there may also be employed a method in which the crease forming member  1  can be fitted into the insertion groove  2  with play, the crease forming member  1  is inserted into the insertion groove  2  in a state where the recording member  5  is held by a hold member (not shown) on both sides thereof sandwiching the insertion groove  2  to thereby push the recording member  5  into the crease forming member  1  with tension applied thereto, whereby the entrance edge of the insertion groove  2  and the leading end of the crease forming member  1  cooperate together in forming a substantially V-shaped crease in the recording member  5 . 
     Especially, in the latter method, the insertion groove  2  may not have a bottom. Or, even when the insertion groove  2  has a bottom, it is not necessary for the recording member  5  pushed into the crease forming member  1  to touch the bottom of the insertion groove  2 ; or, even when the recording member  5  touches the bottom of the insertion groove  2 , the recording member  5  may touch the bottom formally. 
     Further, the wait position H of the crease forming member  1  must be a position where the leading end of the crease forming member  1  does not project from the recording member  5  position. Suppose the leading end of the crease forming member  1  might be a position where the leading end of the crease forming member  1  can project from the recording member  5  position, the leading end of the crease forming member  1  provides an obstacle, which can raise a fear that the given line of the recording member  5  is difficult to be set at a position corresponding to the crease forming member  1 . 
     Still further, the crease forming position M of the crease forming member  1  may be selected properly according to the shape of the insertion groove  2  in the range where a crease can be formed in the recording member  5  by inserting the crease forming member  1  into the insertion groove  2 . 
     The drive unit  4  may only be structured such that it can advance and retreat the crease forming member  1  between the wait position H and crease forming position M, while the crease forming position M may be set as a fixed position or may be set such that it can be adjusted. Here, the wait position H is not limited to a specific one position but a plurality of wait positions may also be set. 
     And, the individual advance/retreat mechanisms  6  may be disposed one (for example,  6   a ,  6   b ) on either side of the longitudinal direction center of the crease forming member  1 . However, they may also be disposed two or more on either side and, further, as shown in  FIG. 3B , they may also be disposed in correspondence to the longitudinal direction center of the crease forming member  1 . 
     Also, the drive control unit  7  must satisfy the condition that the timings of the moving operations of the crease forming member  1  to the crease forming position M to be executed by the plurality of individual advance/retreat mechanisms  6  can be varied from each other and also priority can be given to the moving operations of the crease forming member  1  by one individual advance/retreat mechanisms disposed on both sides of the longitudinal direction center of the crease forming member  1 . This is the necessary condition that makes it possible to form partial creases in the portions of the recording member which range from the end thereof to the center thereof. 
     In this respect, according to a comparison example (an example in which the crease forming member is moved uniformly to the crease forming position), there is a fear that the longitudinal direction center of the crease forming member  1  can be flexed. In this case, the formation of the crease in the crease forming line of the recording member  5  becomes unstable, which makes it necessary to set higher the strength of the casing of the crease forming apparatus. 
     Especially, the specific recording member  5  such as cardboard or coated paper provides a high bending strength and, when the bending strength of the specific recording member  5  is higher than the strength of the casing of the crease forming apparatus, the casing is strain deformed before the crease is formed in the specific recording member  5 , which makes it difficult to form the crease in the specific recording member  5 . Therefore, in order to be able to form the crease in the specific recording member  5  in a proper manner, there is raised a great need to increase the strength of the casing of the crease forming apparatus. 
     Especially, when a specific recording member  5  such as cardboard or coated paper provides high bending strength and the bending strength of the specific recording member is higher than the strength of the casing of the crease forming apparatus, the casing of the crease forming apparatus is strain deformed before a crease is formed in the specific recording member  5 , which makes it difficult to form a crease in the specific recording member  5 . Therefore, in order to be able to form a proper crease in the specific recording member  5 , it is highly necessary to increase the strength of the casing of the crease forming apparatus. 
     Here, a recording member  5  such as ordinary paper normally provides a bending strength which is lower than the strength of the casing of the crease forming apparatus, and thus the casing of the crease forming apparatus is strain deformed after a crease is formed in the recording member  5 . Therefore, there occurs little the above-mentioned inconvenience found in the specific recording member  5  that the crease is difficult to form. 
     Referring to the structure of each of the individual advance/retreat mechanisms  6  employed in the present exemplary embodiment, in order to keep good the operation to form a crease in the recording member  5 , there may be employed a structure in which, when the crease forming member  1  is moved to the crease forming position M by the individual advance/retreat mechanisms  6  ( 6   a ,  6   b ) respectively situated on both sides of the longitudinal direction center C of the crease forming member  1 , the creases can be formed up to a position existing beyond the center of the given line of the recording member  5 . 
     Referring further to the structure of the individual advance/retreat mechanisms  6 , there may be employed a structure in which the individual advance/retreat mechanisms  6  ( 6   a ,  6   b ) respectively situated on both sides of the longitudinal direction center C of the crease forming member  1  are arranged symmetrically. According to this structure, the partial crease forming operations from the end of the recording member  5  to the center thereof can be carried out symmetrically, which can prevent the deviated formation of the creases. 
     Also, as a typical example of drive unit  4  of a type using the thus-structured advance and retreat mechanisms  6 , there can be taken drive unit  4  which is structured in the following manner: that is, a plurality of individual advance/retreat mechanisms  6  respectively include rotatable eccentric cams which, when rotated, can advance and retreat the crease forming member  1 ; and, the drive control unit  7  can set the respective eccentric cams coaxial with each other in a state where the eccentric cams are different in phase from each other, and also can drive and rotate the respective eccentric cams. 
     Now, description will be given below of the operation of the crease forming apparatus according to the present exemplary embodiment with reference to  FIGS. 4A and 4B . 
     In  FIGS. 4A and 4B , the individual advance/retreat mechanism  6  includes a central individual advance/retreat mechanism  6   c  disposed in the longitudinal direction center of the recording member  5  and two end portion side individual advance/retreat mechanisms  6   a ,  6   b  respectively disposed symmetrically in the vicinities of the two end portions of the recording member  5  with the center thereof between them. 
     Here, suppose the moving order of the crease forming member  1  to the crease forming position by the drive control unit  7  is order of the individual advance/retreat mechanisms  6   a  to  6   c , with the operation of the drive control unit  7 , as shown in  FIG. 4A , in a process I, the individual advance/retreat mechanism  6   a  advances the crease forming member  1 , and the crease forming member  1  is moved deviated toward the longitudinal direction one end side thereof to thereby form such a partial crease as shown by a solid line I in  FIG. 4B , which extends from the end of the recording member  5  to the center thereof; in a process II, the individual advance/retreat mechanism  6   b  advances the crease forming member  1 , and the crease forming member  1  is moved deviated toward the longitudinal direction other end side thereof to thereby form such a partial crease as shown by a dotted line II in  FIG. 4B , which extends from the end of the recording member  5  to the center thereof; and, in a process III, the individual advance/retreat mechanism  6   c  advances the crease forming member  1 , and the crease forming member  1  is moved most in the longitudinal direction center thereof to thereby form such a partial crease as shown by a one-dot chained line III in  FIG. 4B , which exists in the vicinity of the center of the recording member  5 . 
     As described above, according to the present exemplary embodiment, after the partial creases are formed in the portions of the recording member  5  ranging from the longitudinal direction ends of to the center thereof, the partial crease is formed in the central portion of the recording member  5 , thereby being able to keep the formation of the crease  5   a  of the recording member  5  in a proper condition. Therefore, for example, when compared with a structure in which the crease forming member  1  is moved uniformly, poor formation of the crease in the longitudinal direction center of the recording member  5  is difficult to occur. 
     According to the present exemplary embodiments 1 and 2, the above-structured crease forming apparatus is widely used in a post processing apparatus for enforcing a post processing on the recording member  5  and in a recording member processing apparatus incorporating such post processing apparatus therein. Here, the post processing apparatus must include at least a crease forming apparatus as a post processing apparatus but, of course, it may also include other post processing apparatus (such as an edge stapling apparatus, or a saddle stapling apparatus, or a perforating apparatus) than the crease forming apparatus. 
     Now, description will be given below in more detail of the invention with reference to the exemplary embodiments thereof respectively shown in the accompanying drawings. 
     Exemplary Embodiment 1 
       FIG. 5  is an explanatory view of an exemplary embodiment 1 of a recording member processing apparatus to which the invention is applied. 
     Outline of Recording Member Processing Apparatus 
     In  FIG. 5 , the recording member processing apparatus includes an image forming apparatus  21  such as a printer or a copying machine for forming a color image, for example, according to an electro photographic system, and a post processing apparatus  22  for enforcing various kinds of post processings on a recording member on which an image has been formed by the image forming apparatus  21 . 
     Here, the post processing apparatus  22  may be provided on the image forming apparatus  21  as standard equipment, or may be equipped additionally as optional equipment according to the request of a user. 
     Especially, according to the present exemplary embodiment, the image forming apparatus  21  includes an apparatus casing  30  with an image forming portion  40  built therein; on one side in the width direction of the top portion of the apparatus casing  30 , there is provided a projecting portion  31  which projects upwardly; and, a recording member can be discharged from the projecting portion  31 . Here, upwardly of the projecting portion  31  of the image forming apparatus  21 , there may be disposed an image read device (not shown), and the image forming apparatus  21  may form an image that is read by the image read device. 
     On the other hand, the post processing apparatus  22  includes a post processing apparatus casing  100 . Inside or outside the post processing apparatus casing  100 , there are disposed various post processing devices and, on the other portion of the top portion  32  of the apparatus casing  30  of the image forming apparatus  21  than the projecting portion  31 , there is provided a transport unit  90  by which a recording member S discharged from the projecting portion  31  can be fed to the post processing apparatus casing  100 . 
     Image Forming Apparatus 
     In  FIG. 5 , the image forming apparatus  21  includes the image forming portion  40  inside the apparatus casing  30 , two or more stages of (in the present exemplary embodiment, four stages of) recording member supply devices  50  (specifically,  50   a  to  50   d ) respectively disposed in the lower portion of the image forming portion  40 , and a recording member feed passage  51  which ranges from the recording member supply devices  50  to the image forming portion  40  and extends substantially in the vertical direction. 
     Here, the image forming portion  40  is of an intermediate transfer type employing, for example, an electro photographic system, and includes a plurality of sensitive members  41  respectively for forming and holding their associated color toner images and an intermediate transfer belt  47  disposed opposed to the respective sensitive members  41 . 
     And, the image forming portion  40  includes, in the peripheries of the respective sensitive members  41 , as the main composing elements thereof, a charging device  42  such as a charging roller for charging the respective sensitive members  41 , an exposure device  43  such as a laser scan device for forming a latent image on the charged sensitive members  41 , a developing device  44  for developing electrostatic latent images on the respective sensitive members  41  into visible images, a transfer device  45  such as a transfer roller for primarily transferring toner images on the respective sensitive members  41  to the intermediate transfer belt  47 , and a cleaning device  46  for cleaning residual toners remaining on the sensitive members  41 . 
     And, between the recording member feed passage  51  and intermediate transfer belt  47 , there is interposed a secondary transfer device  52  for secondarily transferring the toner Images transferred onto the intermediate transfer belt  47  to the recording medium S, and, on the downstream side of the secondary transfer portion of the recording member feed passage  51 , there is provided a fixing device  53  for fixing unfixed toner images existing on the recording member S. Here, reference numeral  54  designates positioning rollers for positioning and feeding the recording member S before the secondary transfer portion, and  55  designates a cleaning device for cleaning residual toners remaining on the intermediate transfer belt  47 . 
     Post Processing Apparatus 
       FIG. 6  is an explanatory view of the post processing apparatus  22  which is only taken out from the recording member processing apparatus shown in  FIG. 5 . 
     In  FIG. 6 , the transport unit  90  includes a unit casing  91  which extends along the top portion  32  of the apparatus casing  30  except the projecting portion  31  of the apparatus casing  30 . Within the unit casing  91 , there is provided a recording member feed passage  92 ; and, along the recording member feed passage  92 , there are provided a proper number of feed rollers  111  to  114 . 
     Also, within the post-processing apparatus casing  100 , there is provided a recording member feed passage  102  which communicates with the recording member feed passage  92  of the transport unit  90 . On the recording member feed passage  92 , there are provided a proper number of feed rollers  115 ,  116 . Between the feed rollers  115 ,  116 , there is interposed a crease forming apparatus  500  serving as a post processing tool. Further, downwardly of the feed roller  116 , there is disposed a positioning and storing receiver  150  which is used to temporarily position and store a plurality of recording members S. 
     Further, within the post processing apparatus casing  100 , there are provided feed rollers  117  which are used to feed a bundle of recording members S stored in the positioning and storing receiver  150 . 
     And, downwardly between the feed rollers  115 ,  116 , there is disposed an edge stapling device  170  serving as a post processing tool for stapling the end portions of the recording members S positioned by the positioning and storing receiver  150 . 
     Also, laterally of the post processing apparatus casing  100 , there is disposed a binding processing apparatus  200  in such a manner that it can be moved up and down. Downwardly of the binding processing device  200 , there is disposed a vertically movable discharge and storage portion  250  for storing not only a bundle of recording members S on which a post processing such as an edge stapling processing or a saddle stapling processing has been enforced but also recording members S not to be post processed. 
     Here, the binding processing apparatus  200  includes a saddle stapling device  220  for stapling the central portion of the bundle of recording members S. Correspondingly to the saddle stapling position of the saddle stapling device  220 , on the downstream side of the recording member feed direction, there is disposed a feed roller  118  (see  FIG. 9 ) for feeding the bundle of recording members S which have been saddle stapled. 
     Positioning and Storing Receiver  150   
       FIGS. 7A and 7B  show the positioning and storing receiver  150  used in the present exemplary embodiment. 
     In  FIGS. 7A and 7B , the positioning and storing receiver  150  is inclined in such a manner that the portion thereof existing on the opposite side to the discharge direction of the recording members S descends. The angle of inclination is set such that the recording members S discharged from the feed rollers  116  of the recording member feed passage  102  are allowed to drop naturally. On the lower end portion of the positioning and storing receiver  150 , there is formed a positioning wall  151  serving as a positioning portion and, on the side edge thereof adjoining the positioning wall  151  as well, there is formed a side edge positioning wall  152  serving as a positioning portion. 
     Also, in the vicinity of the positioning wall  151  of the positioning and storing receiver  150 , there are provided a plurality of (in this example, three) rotation arranging members  153  and, on the portion that is opposed to the side edge positioning wall  152 , there is provided a hold arranging member  156  which is used to hold the recording members S. 
     According to the present exemplary embodiment, the rotation arranging member  153  is a member which includes a plurality of elastic blades respectively arranged in the periphery of a rotation shaft  154  in the diameter direction of the rotation shaft  154 . And, the rotation arranging member  153 , while elastically deforming the elastic blades  155  in the rotational operation thereof, arranges the recording members S put on the positioning and storing receiver  150  toward the positioning wall  151 . 
     Also, the hold arranging member  156 , as shown in  FIG. 7B , is moved to and set at a given position by a drive mechanism (not shown) according to the sizes of the recording members S and, using a hold plate  157  which is energized by an energizing spring  158 , the hold arranging member  156  presses against the recording members S toward the side edge positioning wall  152 . 
     Seventh Feed Roller 
     A support structure for supporting a seventh feed roller  117  used in the present exemplary embodiment, as shown in  FIG. 7A , includes a drive roller  161  which is fixed in position and can be driven and rotated by a support shaft, and a contact and remove roller  162  which can be contacted with and removed from the drive roller  161  through a contact and remove mechanism (not shown) and, when holding the recording member S between itself and drive roller  161 , can be rotated following the drive roller  161 . 
     In the above-mentioned positioning and storing receiver  150  and seventh feed roller  117 , for example, in a process for storing the recording members S into the positioning and storing receiver  150 , as shown in  FIG. 7A , the contact and remove roller  162  of the seventh feed roller  117  is situated spaced apart from the drive roller  161 . And, the recording member S discharged from the sixth feed rollers  116  moves as shown by P 1  in  FIG. 7A ; after then, the recording member S drops at the time when the trailing end thereof is detached from the sixth feed rollers  116 , and moves along the positioning and storing receiver  150  in a direction shown by P 2 ; and, the recording member S is positioned and stored in the positioning and storing receiver  150  by the rotation arranging member  153  and hold arranging member  156 . 
     Edge Stapling Device 
     The details of the edge stapling device  170  used in the present exemplary embodiment are shown in  FIGS. 7A ,  7 B and  8 . 
     In the present exemplary embodiment, the edge stapling device  170  is used to staple the end portions of the recording member S positioned and stored in the positioning and storing receiver  150 . 
     The edge stapling device  170 , as shown in  FIG. 8 , includes a corner stapling device  170   a  for stapling one corner portion of the recording member S and a side edge stapling device  170   b  mainly for stapling one side edge portion of the recording member S. These edge stapling devices  170  ( 170   a ,  170   b ) are structured such that they can be moved along a guide track  171  and, specifically, they can be moved to a proper position by a drive mechanism  175  (such as a mechanism which can be moved following a drive belt). Here, according to the present exemplary embodiment, the guide track  171  includes an arc-shaped curved track portion  172  formed at a portion corresponding to one corner portion of the recording member S and a linear track portion  173  formed so as to extend along one side edge of the recording member S. 
     Especially, according to the present exemplary embodiment, the corner stapling device  170   a  is situated, as its initial position, at a position to correspond to the curved track portion  172 , and the side edge stapling device  170   b  is situated, as its initial position, at a position which exists in the linear track portion  173  and is spaced from the curved track portion. 
     And, for example, in a two position edge stapling mode where one side edge of the recording member S is stapled at two positions, the side edge stapling device  170   b  may be sequentially moved to a position corresponding to the size of the recording member S to staple the side edge of the recording member S, or, the corner stapling device  170   a  and side edge stapling device  170   b  may be used to carry out the edge stapling operation in the two positions. That is, the design of the edge stapling device  170  may be changed properly according to cases. 
     Bookbinding Processing Apparatus 
       FIG. 9  shows the details of the bookbinding processing apparatus  200  used in the present exemplary embodiment. 
     In  FIG. 9 , the bookbinding processing casing  210  of the bookbinding processing apparatus  200  includes an upper division member  212  and a lower division member  213  which are used to divide the recording member feed passage  211  into two sections. 
     In the present exemplary embodiment, the lower division member  213  is structured such that its dimension projecting from the post processing apparatus casing  100  is set shorter than that of the upper division member  212 ; and, the lower portion of the upper division member  212 , where the lower division member  213  does not exist, is opened as a discharge opening  214  for discharging the recording members S to a movable discharge and storage receiver  250 . 
     And, in the present exemplary embodiment, downwardly of the lower division member  213 , there is disposed a movable division member  240 . This movable division member  240  is structured such that, for example, it includes in a portion thereof a gear tooth (not shown) capable of meshing with a drive gear  241 , and, with the rotation of the drive gear  241 , the movable division member  240  can be moved substantially along the division surface of the lower division member  213  in an extending manner according to cases. 
     Owing to this, when the size of the recording member S is large, the recording member S can be supported by the movable division member  24   0  and a saddle stapling processing by the saddle stapling device  220  can be made possible. And, the movable division member  240  can be moved properly according to the size of the recording member S. 
     Further, into the bookbinding processing casing  210 , there are incorporated the saddle stapling device  220  and an eighth feed roller  118 . 
     Saddle Stapling Device 
     In the present exemplary embodiment, the saddle stapling device  220 , as shown in  FIG. 10 , includes a pair of saddle stapling devices  220  which are respectively fixed with respect to a direction (width direction) perpendicular to the feed direction of the recording member S. Specifically, as shown in  FIG. 9 , each saddle stapling device  220  includes a saddle stapling device main body  221  set in the upper division member  212 , and an opposing member  230  which is provided on a portion of the lower division member  213  in such a manner that it is prevented from interfering with the feeding operation of the recording member S bundle. 
     In this structure, the saddle stapling device main body  221  includes a support base  222  to be fixedly installed on the upper division member  212  and a movable stapling portion  223  which can be oscillated with respect to the support base  222 , whereby a stapling needle can be struck into the recording member S bundle in the recording member feed passage  211  through a striking opening  224  opened up in a portion of the upper division member  212 . Here, the movable stapling portion  223  has a function to strike a stapling needle and also has a structure substantially similar to that of the edge stapling device  170 . 
     Also, the opposing member  230  is made of hard material and is disposed so as to correspond to the saddle stapling position of the movable stapling portion  223 . 
     Further, in the present exemplary embodiment, the pair of saddle stapling devices  220  are provided in a fixed manner. However, for example, when there is raised a request that the saddle stapling position can be changed according to the size of the recording member S, the pair of saddle stapling devices  220  may also be supported through a movable mechanism in such a manner that they can be moved along the width direction of the recording member S. 
     Eighth Feed Roller 
     The eighth feed roller  118 , as shown in  FIGS. 9 and 10 , similarly to the seventh feed roller  117 , includes a drive roller  161  on the lower side thereof and a contact and remove roller  162  on the upper side thereof. 
     Here, the drive roller  161  is used to transmit a drive force from a drive motor  261  through a drive transmission mechanism  262  to a support shaft  263 , whereas the contact and remove roller  162  is energized toward the drive roller  161  by an energizing spring (not shown). 
     In the present exemplary embodiment, the eighth feed roller  118  is interposed between the pair of saddle stapling devices  220  and they are disposed opposed to each other through a roller opening  225  formed in the upper division member  212 . 
     Especially, according to the present exemplary embodiment, the eighth roller  118  is structured such that, when the recording member S bundle is held and fed by the seventh feed roller  117 , the drive roller  161  and contact and remove roller  162  are situated spaced from each other; and, when the saddle stapling processing by the saddle stapling device  220  is finished, the eighth feed roller  118  held the recording member S bundle by and between the drive roller  161  and contact and remove roller  162 . 
     Crease Forming Apparatus 
     According to the present exemplary embodiment, the crease forming apparatus  500 , as shown in  FIG. 11A , includes: a crease forming unit  501  which is disposed downwardly of the recording member feed passage  102  so as to be able to advance and retreat in a direction perpendicular to the feed direction of the recording member S and also can form a crease in the recording member S, for example, along the feed direction center line of the recording member S; a groove forming block  502  provided upwardly of the recording member feed passage  102 ; and, a lift device  503  for lifting and lowering the crease forming unit  501  between a wait position and a crease forming position. 
     Here, in a portion of the recording member feed passage  102 , there is provided a position detect device  103  for detecting the position of the recording member S. 
     And, according to the present crease forming apparatus  500 , as shown in  FIG. 11B , the feed direction center line of the recording member S is set in a portion corresponding to the crease forming unit  501  and, as shown in  FIG. 11C , a crease Sa is formed between the crease forming unit  501  and groove forming block  502 . 
     Now, description will be given below in more detail of the crease forming apparatus  500  used in the present exemplary embodiment. 
     The crease forming apparatus  500 , as shown in  FIGS. 12 to 19 , has an apparatus frame member  510  including an upper frame member  511  and a lower frame member  512  connected to each other by a side plate  513  and, in the apparatus frame member  50 , there are incorporated the crease forming unit  501 , groove forming block  502  and lift device  503 . 
     Here, the apparatus frame member  510 , as shown in FIGS.  12  and  13 , is positioned at a given portion of the post processing apparatus casing  100  using positioning pins  515  and  516  and, after then, it is fixed using an adjust screw  517 . 
     Here, the crease forming unit  501 , especially as shown in  FIGS. 15 ,  18  and  19 , includes: a crease forming blade  520  made of a thin plate member of SUS or the like and extending along the feed direction center line of the recording member S; a pair of hold plates for holding the crease forming blade  520  except the upper portion thereof; a pair of hold blocks  522  made of, for example, POM (polyacetal) and fixedly disposed outside the pair of hold plates  521  by a fixing tool  523  such as a screw; and, a plurality of (in the present exemplary embodiment, three) ring-shaped cam followers  525  ( 525   a  to  525   c ) which can be fixed in the vicinities of the longitudinal direction center and two end portions of the lower portions of the pair of hold plates  521  by a fixing tool  526 . 
     And, the longitudinal direction two end portions of the hold plates  521  are set to penetrate through the hole portions of the side plates  513  of the apparatus frame member  510  and are also held in such a manner that they can be slid along the vertically extending guide grooves  519  of guide plates  519  mounted on the side plates  513  of the apparatus frame member  510 . 
     Here, reference numeral  524  designates a fixing member such as a screw for fixing the hold plate  521 ,  522   d  a recessed portion for avoiding an inconvenience that the fixing member  524  of the hold plate  521  interferes with the vertical movement of the hold block  522  when the hold block  522  moves up and down, and  522   e  a cutout formed by a portion of the hold block  522  correspondingly to a cam follower  525   c  ( 525 ) situated in the center of the crease forming unit  501  in order to prevent the crease forming unit  501  from interfering with the cam follower  525   c , respectively. 
     Also, the groove forming block  502  is positioned and fixed to the upper frame member  511  through a positioning pin  531  and includes a slit-shaped insertion groove  530  (see  FIGS. 20 to 22 , and  FIGS. 25A to 25D ) formed in a portion thereof corresponding to the crease forming blade  520  of the crease forming unit  501 . 
     Further, referring to the structure of the lift device  503 , it includes a rotation shaft  540  which penetrates through the two side plates  513  of the apparatus frame member  510 ; to the vicinities of the center and two end portions of the rotation shaft  540 , there are fixed eccentric cams  541  ( 541   a  to  541   c ) coaxially therewith; and, the eccentric cams  541  ( 541   a  to  541   c ) are respectively fitted into their corresponding cam followers  525  ( 525   a  to  525   c ). 
     According to the present exemplary embodiment, the eccentric cams  541   a  and  541   b  are disposed at symmetrical positions with the longitudinal direction center of the crease forming unit  501  as the boundary thereof. 
     And, to the rotation shaft  540 , there can be transmitted a drive force from a drive motor  542 , which is provided on the side plate  513  of the apparatus frame member  510 , by a drive transmission mechanism  543  which is composed of, for example, a drive transmission gear train. 
     Further, coaxially with a drive transmission gear which is included in the drive transmission gear train of the drive transmission mechanism  543  and is provided coaxially with the rotation shaft  540 , there is provided a rotation plate  544 ; a portion of the rotation plate  544  is cut out; and, the position of such cutout is detected by an optical detect device  545  to thereby grasp the home positions of the eccentric cams  541 . 
     Still further, on the lower frame member  512  of the apparatus frame member  510 , there are provided two support blocks  550  in such a manner that they are separated from each other in the vicinity of the longitudinal direction center of the lower frame member  512 ; in the support blocks  550 , there are formed long bearing grooves  551  respectively; and, the rotation shaft  540  is rotatably supported on the bearing grooves  551 . And, in the support blocks  550 , there are formed spring receiving recessed portions  552  along the longitudinal direction of the support blocks  550  at proper intervals; these spring receiving recessed portions  552  respectively hold their associated energizing springs  553  made of, for example, coil springs; and, these energizing springs  553  are used to elastically support the hold block  522 . 
     Here, as shown in  FIG. 19 , in the lower portion of the hold block  522  as well, there are formed fit holes  527  into which the upper portions of the associated energizing springs  553  can be fitted. 
     Operation to be Carried Out by Lift Device 
     Next, description will be given below of an example of the operation to be carried out by the lift device  503  with reference to  FIGS. 20 to 22 . 
       FIG. 20  shows a state where the eccentric cam  541  is situated at its bottom dead center. 
     At the then time, the cam follower  525 , which moves following the eccentric cam  541 , is also situated at the lowest position. Owing to this, the crease forming blade  520  of the crease forming unit  501  is situated at the lowest wait position H. 
     Next, as shown in  FIG. 21 , when the eccentric cam  541  rotates by a given angle (for example, 90 degrees), an amount of eccentricity provided by the eccentric cam  541  rises from the bottom dead center position and, with the rising eccentricity amount, the cam follower  525  rises to thereby raise the crease forming blade  520  of the crease forming unit  501 . At the same time, since fixing devices  523  are penetrated through the hold plate  521  of the crease forming blade  520 , the hold block  522  is also raised through these fixing devices  523 . 
     In this state, the hold block  522  is contacted with the groove forming block  502  and, when the recording member S has been fed, the recording member S can be held by the hold block  522 . Also, the leading end of the crease forming blade  520  is disposed in such a manner that it is prevented from projecting toward the insertion groove  530  beyond the contact portion between the hold block  522  and groove forming block  502 . 
     Further, as shown in  FIG. 22 , when the eccentric cam  541  rotates by a given angle (for example, 90 degrees), the eccentric cam  541  reaches its top dead center position. With arrival of the eccentric cam  541  at the top dead center position, the cam follower  525  arrives at its most raised position, whereby the crease forming blade  520  of the crease forming unit  501  is inserted into the insertion groove  530  of the groove forming block  502 . 
     And, when the crease forming blade  520  of the crease forming unit  501  is inserted into the insertion groove  530  of the groove forming block  502 , the recording member S is sliced against the holding force of the recording member S given by the hold block  522 , and the crease forming blade  520  is allowed to form a crease in the recording member  3  along the given line of the recording member S. 
     At the then time, although the fixing devices  523  are penetrated through the hold plate  521  of the crease forming blade  520 , when the penetration holes of the fixing devices  523  have been formed as elongated holes which extend in an upward direction and in a downward direction with the position shown in  FIG. 21  as the boundary thereof, even if the hold plate  521  rises, the positions of the fixing devices  523  are prevented from rising. As a result of this, the position of the hold block  522  can be maintained in the same state as the state shown in  FIG. 21 . In this state, the hold block  522  is pressed against the groove forming block  502  through the recording member S by the energizing forces of the energizing springs  553 . 
     Setting of Phase Difference of Eccentric Cam of Lift Device 
     According to the present exemplary embodiment, the lift device  503  is structured in the following manner. That is, as shown in  FIG. 23 , when a drive force from the drive motor  542  is transmitted through the drive transmission mechanism  543  to the rotation shaft  540  to thereby rotate the respective eccentric cams  541  ( 541   a  to  541   c ) sequentially, the eccentric cam  541  fin this example,  541   a ) situated on one end side of the longitudinal direction of the crease forming unit  501  arrives first at the top dead center (process I), the eccentric cam  541  (in this example,  541   b ) situated on the other end side of the longitudinal direction of the crease forming unit  501  arrives next at the top dead center with a given phase difference θab (for example, 30 degrees) (process II), and the eccentric cam  541  (in this example,  541   c ) situated in the center of the longitudinal direction of the crease forming unit  510  arrives last at the top dead center with a given phase difference θac (for example, 30 degrees) (process III). 
     Here, giving a supplementary explanation of the respective eccentric cams  541  ( 541   a  to  541   c ), as shown in  FIG. 23 , the respective eccentric cams  541  ( 541   a  to  541   c ) have the bottom dead center Pmin at the same phase position. Specifically, the eccentric cam  541   a  arrives at the top dead center Pmax with a phase difference θa from the bottom dead center Pmin; the eccentric cam  541   b  arrives at the top dead center Pmax with a phase difference θb from the bottom dead center Pmin; and, the eccentric cam  541   c  arrives at the top dead center Pmax with a phase difference θc from the bottom dead center Pmin. 
     According to the present exemplary embodiment, the relationship between the phase differences θa to θc is set such that θa&lt;θb&lt;θc and timings, at which the respective eccentric cams  541  ( 541   a  to  541   c ) arrive at the top dead center Pmax, are set such that they are shifted respectively by a phase difference θab(θb−θa) and by a phase difference θbc(θc−θb). 
     Also, the respective eccentric cams  541  ( 541   a  to  541   c ), as shown in  FIG. 24 , are situated at the bottom dead centers thereof at the same phase position (0°) (see  FIG. 20 ). For example, at the time when they are rotated, by a given angle (for example, 90°), they arrive at a state where the hold block  522  is contacted with the groove forming block  502  (see  FIG. 21 ). After then, the eccentric cam  541   a  arrives first at the top dead center (see  FIG. 22 ), after a phase difference θab, the eccentric cam  541   b  arrives at the top dead center and further, after a phase difference θac, the eccentric cam  541   c  arrives at the top dead center, whereby the eccentric cams  541  are rotated once and thus they return to their initial states. 
     Therefore, according to the present exemplary embodiment, with the above-mentioned operation of the lift device  503 , as shown in  FIGS. 25A to 25C , in the process I, the crease forming blade  520  rises deviated toward one end side in the longitudinal direction thereof to thereby form such a partial crease as shown by a solid line in  FIG. 25D  in such a manner that it extends from the end of the recording member S to the center thereof; in the process II, the crease forming blade  520  rises deviated toward the other end side in the longitudinal direction thereof to thereby form such a partial crease as shown by a dotted line in  FIG. 25D  in such a manner that it extends from the end of the recording member S to the center thereof; in the process III, the crease forming blade  520  rises most in the longitudinal direction center thereof to thereby form such a partial crease in the vicinity of the center of the recording member S as shown by a one-dot chained line III in  FIG. 25D . 
     As described above, in the present exemplary embodiment, since the partial crease in the center of the recording member S is formed after formation of the partial crease in the portion of the recording member S ranging from the longitudinal direction end thereof to the center thereof, for example, when compared with a structure in which the crease forming blade  520  is raised uniformly, poor formation of the crease in the longitudinal direction center of the recording member S is difficult to occur. 
     Here, in order to stabilize the formation of the crease by the crease forming unit  501 , the rotation shaft  540  of the lift device  503  may be rotated twice or more times to thereby repeat the operation to form partial creases in the same portion by the crease forming blade  520 . 
     Parameters in Crease Forming Apparatus 
     As shown in  FIGS. 26A and 26B , the respective parameters of the crease forming apparatus will be checked now. 
     Firstly, the parameters are defined in the following manner. 
     A 1 : Insertion distance of the crease forming blade  520  from the surface of the groove forming block  502 . 
     A 2 : Floating amount of the recording member S. 
     B 1 : Thickness of the crease forming blade  520 . 
     B 2 : Groove width of the insertion groove  530 . 
     C 1 : Depth-direction dimension of the guide surface situated on the recording member feed direction downstream side of the insertion groove  530 . 
     C 2 : Dimension of the guide surface along the feed direction of the recording member. 
     F 1 , F 2 : Recording member holding forces by the hold block  522 . 
     R: Radius of curvature of a curved guide surface situated on the recording member feed direction downstream side of the insertion groove  530 . 
     In the present exemplary embodiment, in the recording member feed direction upstream side edge portion of the insertion groove  530  of the groove forming block  502 , there is formed a curved guide surface  536 ; and, in the recording member feed direction downstream side edge portion of the insertion groove  530  of the groove forming block  502 , there is formed a linear-shaped guide surface  537 . 
     Also, in the groove forming block  502  side surfaces of the hold blocks  522  respectively situated in front of and behind the crease forming unit  501 , there are formed guide inclined surfaces  528  and  529  which are used to spread open the feed passage of the recording member S coward the recording member feed direction upstream side. 
     Here, the reason for such formation of the groove forming block  502  side guide surfaces  536  and  537  is that, when the crease forming blade  520  of the crease forming unit  501  is inserted into the insertion groove  530 , no shoulder portion cannot be formed in the periphery of the crease of the recording member S. 
     On the other hand, the reason for such formation of the guide inclined surfaces  528  and  529  of the hold block  522  is that, when the hold block  522  is not in contact with the groove forming block  502 , the recording member S can be guided and fed along the guide inclined surfaces  528  and  529 . 
     Firstly, for the parameter “A 1 ”, R, C 1  and C 2  of the guide surfaces  536  and  537  must be taken into consideration and the crease forming blade  520  must be inserted into the insertion groove deeper than the boundary portion between the guide surfaces  536 ,  537  and insertion groove  530 . 
     For the parameter “A 2 ”, since the recording member S is held by the hold block  522 , in principle, “A 2 ” may be 0. 
     For the parameter “B 1 ”, when the thickness of the crease forming blade  520  increases, for example, when the thickness is 0.2 mm or more, two creased portions are easy to form in the leading end portion of a crease. Therefore, the thickness may be set less than 0.2 mm; more, it may be set 0.1 mm or less. 
     For the parameter “B 2 ”, for example, when B 1  is 0.1 mm, even if B 2  is of the order of 2.0 mm, by adjusting the value of A 1 , a crease can be formed in the recording member S. 
     The parameters R, C 1  and C 2 , as described above, may be selected in the range that can prevent a shoulder from being formed in the periphery of the crease of the recording member S. When these parameters increase, it corresponds to the fact that A 1  decreases and, therefore, as described above, the value of A 1  must be adjusted. 
     Further, for the parameters F 1  and F 2 , they must be set such that, when a crease is formed by the crease forming unit  501 , the holding of the recording member S by the hold block  522  must be set so as to allow the sliding movement of the recording member S. Since this recording member holding force can also vary depending on the coefficient of friction between the hold block  522  and the surface of the recording surface S, the surface of the recording member holding portion of the hold block  522  may be formed to have a rib or may be worked, thereby reducing the recording member holding force further. 
     Modification of Crease Forming Unit 
     In the present exemplary embodiment, the crease forming unit  501  is not limited to the structure shown in  FIG. 18  but, for example, there may also be used a structure shown in  FIGS. 27 and 28 . 
     The crease forming unit  501  is structured in the following manner. That is, the crease forming blade  520  is held by a pair of hold plate  521 , the hold plates  521  are fixed to a support plate  560 , cam followers  525  are fixed to the lower portion of the support plate  560 , the hold block  522  includes comb-teeth-shaped hold portions  561  formed along the longitudinal direction thereof, and the hold block  522  is mounted on the hold plates  521  in such a manner that it can be moved in the vertical direction. 
     Referring here to the vertically movable structure of the hold block  522 , in the hold plates  521 , there are formed elongated holes  562  respectively extending in the vertical direction, and fixing devices are moved slidably with respect to the elongated holes  562 , whereby, after the hold block  522  is contacted with a groove forming block (not shown), only the crease forming blade  520  of the crease forming unit  501  is inserted into the side of an insertion groove (not shown) with respect to the hold block  522 . 
     Here, as shown in  FIG. 28 , in the hold plate  521  side surface of the hold block  522 , there are formed recessed portions  565  at proper intervals along the longitudinal direction of the hold block  522  in such a manner that the recessed portions  565  respectively extend in the vertical direction. These recessed portions  565  are used to avoid an inconvenience that, when the crease forming blade  520  is held and fixed by the pair of hold plates  521 , a fixing device such as a screw can interfere with the vertical movement of the hold block  522 . 
     Control System 
     Now,  FIG. 29  shows a control system employed in a recording member processing apparatus used in the present exemplary embodiment. 
     In  FIG. 29 , an image forming apparatus  21  includes: an operation portion  400  for operating the size of a recording member S, the number of recording members S, the presence or absence of a perforating processing, the presence or absence of a binding mode, and the like; and, a control unit  410  which, based on information from the operation portion  400 , controls members to be operated (such as a motor and a detect device). 
     Also, a post processing apparatus  22  includes a control unit  430  capable of exchanging information with the control unit  410  of the image forming apparatus  21 , while the control unit  430  controls members to be operated (such as a motor or a detect device). In addition to this, the control unit  430  further controls post processing devices; specifically, the control unit  430  controls a crease forming device  500 , a positioning and storing receiver  150  for carrying out a recording member positioning processing, an edge stapling device  170 , a saddle stapling device  220 , a movable discharge and storage receiver  250 , and the like. 
     Operation of Recording Member Processing Apparatus 
     Next, description will be given below of the operation of a recording member processing apparatus used in the present exemplary embodiment. 
     According to the present exemplary embodiment, the control unit  410  of the image forming apparatus  21  and the control unit  430  of the post processing apparatus  22 , as shown in  FIG. 30 , check whether a post processing is present or not. When the post processing is present, they check whether the post processing is an edge stapling mode, a crease forming mode, a saddle stapling mode, or other mode. When the post processing is absent, the control units  410  and  430  carry out a normal mode. And, according to the mode of the post processing, they carry out the edge stapling mode, saddle stapling mode, crease forming mode, or other mode (for example, a perforating mode). 
     Normal Mode 
     Now, referring to a case where the recording member processing apparatus is being executed in a normal mode, when an image is formed in a recording member S supplied from a recording member supply device  50  ( 50   a  to  50   d ) by an image forming portion  40 , the image formed recording member S is moved through a fixing device  53  and transport unit  90  to the post processing apparatus  22  and, after then, the recording member S is discharged and stored into the movable discharge and storage receiver  250  with no post processing enforced thereon. 
     At the then time, in the present exemplary embodiment, since the bookbinding processing device  200 , in a normal mode, moves and retreats to an upward position which is the initial position of the device  200 , the recording member S fed within the post processing apparatus  22  is not moved through the bookbinding processing apparatus  200  but is discharged as it is into the movable discharge and storage receiver  250 . 
     Here, in the present exemplary embodiment, both of the normal mode recording member and post-processed recording member are discharged into the movable discharge and storage receiver  250 . However, this is not limitative but, for example, in the apparatus casing  30  of the image forming apparatus  21 , there may also be formed a discharge and storage portion which is used to store the normal mode recording member S, and the normal mode recording member S may be stored into this discharge and storage portion. 
     Crease Forming Mode 
     Next, when the recording member processing apparatus is being operated in a crease forming mode, the recording member S, on which an image has been formed by the image forming apparatus  21 , is fed through the transport unit  90  to the recording member feed passage  102  of the post processing apparatus  22 . 
     And, the recording member S fed to the recording member feed passage  102 , as shown in  FIGS. 11A and 11B , is fed up to a given position by the position detect device  103  and, after then, at the time when the feed direction center of the recording member S arrives at a position where a crease formation processing is carried out by the crease forming apparatus  500 , the driving of the feed rollers  115  and  116  are caused to stop, thereby stopping the movement of the recording member S temporarily. 
     In this state, according to the present exemplary embodiment, the crease forming apparatus  500  forms a crease in the center of the recording member S. 
     After then, the recording member with the crease formed thereon, as shown in  FIG. 31 , is temporarily positioned and stored into the positioning and storing receiver  150 . 
     After then, a bundle of recording members S with the creases formed thereon are fed all at once by the feed roller  117  and are as they are discharged and stored into the movable discharge and storage receiver  250 . 
     Here, in the present mode, since the bookbinding processing device  200 , in the initial position thereof, has been retreated upwardly, the bundle of recording members S discharged from the positioning and storing receiver  250  is set into the position relationship where it is discharged into the positioning and storing receiver  250  not through the bookbinding processing device  200 . 
     Edge Stapling Mode 
     Next, description will be given below of a case where the recording member processing apparatus is being operated in an edge stapling mode. 
     Since the bookbinding processing device  200 , in the initial position thereof, has been retreated upwardly, the bundle of recording members S discharged from the positioning and storing receiver  250  is set into the position relationship where it is discharged into the positioning and storing receiver  250  not through the bookbinding processing device  200 . 
     In this state, the recording member S, on which an image has been formed by the image forming apparatus  21 , is guided through the transport unit  90  to the post processing apparatus  22 . 
     And, the recording members S guided to the post processing apparatus  22  are positioned and discharged sequentially to the positioning and storing receiver  150 . 
     At the then time, as shown in  FIG. 32 , since the seventh feed roller  117  is disposed spaced, there is no possibility that the recording members S can be interfered by the seventh feed roller  117  and thus the discharging operations of the recording members S can be obstructed. 
     After then, in the positioning and storing receiver  150 , the recording member S is positioned and stored in two adjoining directions by the rotation arranging member  153  and hold arranging member  156 . 
     When the above-mentioned operation is carried out repeatedly and the bundle of a given number of recording members S is arranged in the positioning and storing receiver  150 , the edge stapling device  170  staples the end portion of the recording member S bundle (one corner portion of the recording member S bundle is stapled at one position or one side edge portion of the recording member S bundle is stapled at two positions), which has been positioned and stored into the positioning and storing receiver  150 , using a stapling needle  190 . 
     And, when the end etching processing of the edge stapling device  170  is finished, the seventh feed rollers  117  sandwich and feed the end stapled recording member S bundle existing within the positioning and storing receiver  150  and discharge the bundle to the movable discharge and storage receiver  250 . 
     Also, according to the present exemplary embodiment, since the bookbinding processing device  200 , in an edge stapling mode, has retreated to its initial position, a space portion existing upwardly of the post processing storage receiver  250  is wide, which can make it easier to take out the bundle of the end stapled recording members S from the post processing storage receiver  250 . 
     Here, according to the present exemplary embodiment, there is employed a structure in which the bookbinding processing device  200 , in an edge stapling mode, retreats to its initial position; however, this is not limitative but the bookbinding processing device  200  may also be provided in such a manner that it is fixed to its position in a saddle stapling mode. In this case, a saddle stapling processing is not carried out but, after the bundle of the end stapled recording members S is held and fed by the seventh feed rollers  117 , such bundle may be delivered to the eighth feed rollers  118  and may be then discharged to the movable discharge and storage receiver  250 . 
     Saddle Stapling Mode 
     Next, description will be given below of a case in which the recording member processing apparatus executes a saddle stapling mode (see  FIGS. 33A and 33B ). 
     Now, when a saddle stapling mode is selected, the bookbinding processing device  200  moves from its initial position down to a set position which is capable of a saddle stapling processing. 
     In this state, the recording member S, on which an image has been formed by the image forming apparatus  21 , is guided through the transport unit  90  to the post processing apparatus  22 . 
     After then, in the post processing apparatus  22 , there is carried out a crease forming processing similar to the above-mentioned crease forming mode and, after the movement of the recording member S is stopped temporarily, a crease Sa is formed in the central portion of the recording member S by the crease forming apparatus  500 . 
     Next, the recording member S with the crease Sa formed thereon is once discharged to and stored in the positioning and storing receiver  150  (see  FIG. 33A ). 
     In the positioning and storing receiver  150 , the recording member S is positioned and stored in two adjoining directions by the rotation arranging member  153  and hold arranging member  156 . 
     The above-mentioned operation is executed on a given number of recording members S repeatedly to arrange the bundle of a given number of recording members S. In this state, the seventh feed rollers  117  hold between them the recording member S bundle positioned and stored by the positioning and storing receiver  150 . After then, according to the size of the recording member S, the recording member S bundle is fed by a given amount m; specifically, the recording member S bundle is fed to a position where a saddle stapling position, where the saddle stapling device  220  carries out its processing, provides the central portion of the recording member S bundle (see  FIG. 33A ). 
     After then, a saddle stapling processing is carried out by the saddle stapling device  220  using the stapling needle  190 . Next, the eighth feed rollers  118  hold between them and feed the bundle of the saddle stapled recording members S and then discharge the bundle to the movable discharge and storage receiver  250  (see  FIG. 33B ). Here, when the recording member S bundle is held and fed by the eighth feed rollers  118 , the seventh feed rollers  117  are spaced from each other. 
     EXAMPLE 
     Now, in an example model shown in  FIG. 34B , as the basic structure of the crease forming apparatus  500 , there is formed an insertion groove  530  in a groove forming block  502 , there is provided the crease forming blade  520  of a crease forming unit  501  in such a manner that it can be inserted into the insertion groove  530 , there are provided hold blocks  522  respectively on front and rear sides in the feed direction of the recording member S with the insertion groove  530  between them, and no guide surface is specially formed in the edge portion of the insertion groove  530 . 
     In this example model, the thickness of the crease forming blade  520  made of SUS was set for 0.1 mm, the insertion distance A 1  of the crease forming blade  520  into the insertion groove  530  and the groove width B 2  of the insertion groove  530  were varied as parameters, and the state of formation of the crease was checked. This check gave such results that are shown in  FIG. 34A . 
     In  FIG. 34A , ● shows that the state of the formed crease is OK, Δ shows that the state of the formed crease is Insufficient, and × shows that the state of the crease is no good (the recording member cannot be bent along the crease). 
       FIG. 34A  shows that, when A 1  is set large with respect to B 2 , the leading end of the crease portion of the recording member S can be sharpened and thus there can be provided good state of formation of the crease. 
     The foregoing description of the exemplary embodiments of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to understand the invention for various embodiments and with the various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the following claims and their equivalents.