JP5749903B2 - Sheet folding device - Google Patents

Description

  The present invention relates to a sheet folding apparatus that folds an image-formed sheet, and relates to an improvement of a sheet folding mechanism that can fold a sheet at a precise crease position with a simple structure.

  In general, this type of sheet folding apparatus is widely known as an apparatus for folding and finishing a sheet on which an image has been formed by an image forming apparatus such as a printing machine, a printer apparatus, or a copying machine at a predetermined folding position. For example, Japanese Patent Application Laid-Open No. 2003-228620 proposes an apparatus that folds an image-formed sheet connected to a paper discharge port of an image forming apparatus for filing and transports the sheet to a subsequent binding processing apparatus.

  Thus, the sheet folding apparatus that folds the sheet in half or one-third and carries it out is configured as a post-processing apparatus of the image forming apparatus, or is built in the image forming apparatus or the binding processing apparatus. It is configured as a unit. Various folding specifications are known for filing, such as 1/2 folding, Z folding, 1/3 letter folding (inner 3 folding, outer 3 folding).

  In view of this, a folding apparatus that is connected to or built in an image forming apparatus, a binding apparatus (finisher apparatus, bookbinding apparatus), or the like includes a folding processing mechanism and a conveyance mechanism that feeds and sets sheets. For example, Patent Document 1 discloses a folding plate in which a pair of rollers for folding a sheet bundle is provided on a stacking guide for aligning sequentially fed sheets in a bundle shape, and the roller pair is disposed at a position facing the roller pair across a path. Discloses an apparatus for inserting a fold of a sheet bundle into a nip point of a roller pair.

Similarly, in Patent Document 2 and Patent Document 3, a pair of rollers and a folding plate (folding blade) are arranged in the sheet feeding path, and the folding position of the sheet is inserted at the nip point of the roller pair with the folding plate. An apparatus for folding is disclosed.
Further, on the upstream side and the downstream side of the folding roll, the conveying means for feeding out the leading end and the trailing end of the sheet is constituted by a leading end stopper and a belt in Patent Document 2 and a roller in Patent Document 3, respectively. .
After the sheet fed to the folding position is temporarily stopped, the sheet speed inserted by the folding blade, the sheet speed folded by the pair of folding rolls, the sheet speed fed out by the upstream conveying means, and the downstream conveying means Control is performed so that the sheet speed to be fed coincides with each other.

  As described above, in the folding mechanism that inserts the fold position of the sheet between the roll nips with the folding plate, the sheet speed inserted by the folding blade, the sheet speed folded by the pair of folding rolls, the sheet speed fed out by the upstream conveying means, There is a known problem that the crease position may be out of order if the sheet speeds fed by the downstream conveying means do not exactly match, and the respective timing control becomes complicated.

  Therefore, Patent Document 4 discloses a timing at which a fold line is formed by disposing a driven roller movably between a retracted position and a pressure contact position between the folding rolls that are in pressure contact with each other and located on the downstream side in the sheet transfer direction. Has proposed a folding mechanism for moving the driven roller from the retracted position to the press-contact position. According to this mechanism, the speed inserted by the driven roller, the speed of the folding roller, and the sheet speed fed out by the upstream conveying means are the same (since they are composed of the same roller), and there is no need to adjust the respective speeds.

  Also, for example, Patent Documents 5 and 6 disclose that the blade moving speed is set faster than the peripheral speed of the folding roller when the sheet bundle is inserted between the pair of press-fold folding rollers with a folding blade and folded. Yes.

  In this way, when inserting the sheet fold into the nip position of the folding roll, in Patent Document 7, a gear is provided on the deflection member, and this gear is engaged with a pinion connected to the drive motor and deflected by the rotation of the motor. A mechanism for moving a member from a standby position to an operating position is disclosed (see FIG. 4). Patent Document 8 also discloses a similar mechanism.

Japanese Patent Laying-Open No. 2008-247531 (FIG. 1) JP 2007-320665 A Japanese Patent Laying-Open No. 2008-007297 (FIG. 6) JP 2005008337 A JP 2001-002317 A JP 2008-184324 A Japanese Patent Laying-Open No. 2006-290618 (FIG. 4) JP 2007-015785 A

  As described above, there is already known a folding processing apparatus in which a sheet sent to a conveyance path is inserted into a pair of folding rolls and the folding position is inserted by a sheet deflecting member. In this case, it is also known that if the crease position is displaced, the finished quality is greatly affected.

  The sheet deflecting member for inserting the sheet into the nip portion includes a mechanism for guiding the sheet to the nip position with a plate member such as a knife blade, and a roll of folding the sheet with a driven roller as disclosed in Patent Documents 7 and 8. A mechanism is known in which it is brought into sliding contact with a peripheral surface and guided to a nip position.

  In either case, it is necessary to move the deflecting member from the standby position retracted from the sheet conveyance path to the operating position, and the position of the crease position is the speed of the sheet movement, whether it is faster or slower than the displacement speed of the deflecting member. Invite deviation.

  Therefore, the deflection member that guides the sheet to the nip position of the folding roll is required to move at a constant speed from at least the position where the sheet is first engaged to the operating position. If unevenness occurs in the moving speed of the deflecting member, the crease position is displaced.

  Conventionally, however, the rotation of the drive rotary shaft connected to the drive motor is converted into the movement of the deflection member by a gear transmission mechanism, a crank lever mechanism, or the like. At this time, the timing when the tip of the deflecting member (the driven roller, the blade member, etc.) abuts with the peripheral surface of the folding roll coincides with the stop timing of the drive motor.

  Therefore, conventionally, the rotation of the drive motor is stopped immediately before the tip of the deflecting member comes into contact with the peripheral surface of the folding roll, and control is performed so that the stop timing of the deflecting member and the motor coincides. However, since the drive motor cannot be instantaneously stopped from a predetermined constant speed, the drive motor is decelerated and stopped by, for example, an electric brake. This decelerating stop of the motor becomes a speed variation of the deflecting member and causes a misalignment of the crease as well as a timing misalignment.

  In view of such a problem, the present inventor transmits drive transmission means for transmitting the rotation of the drive rotary shaft to the deflection member so that the elevating member moves at a constant speed from the standby position to the operating position, and the driven roller of the deflection member is transmitted. After coming into contact with the circumferential surface of the roller, the idea was made to allow the rotation of the drive rotation shaft to be transmitted without transmitting the drive.

  In the present invention, when the fold position of the sheet is guided to the nip position of the pair of folding rolls by the deflecting means, the accurate fold position can be guided to the nip portion, and the sheet can always be folded with the accurate fold line. The problem is to provide a folding device. Another object of the present invention is to provide a sheet folding apparatus that can easily control the drive motor that drives the sheet deflecting means and that can determine an accurate fold position.

  In order to achieve the above object, the present invention provides a driven roller that abuts a sheet deflecting means for guiding a sheet to a nip portion of a pair of folding rolls with a peripheral surface of a roll, and a lifting member that holds the driven roller and moves from a standby position to an operating position. The drive means for moving the elevating member is constituted by a drive rotation shaft and a drive transmission means for transmitting the rotation. The drive transmission means transmits the rotation of the drive rotating shaft so that the elevating member moves from the standby position to the operating position at a predetermined speed, and transmits the drive after the driven roller comes into contact with the circumferential surface of the roll. And is configured to allow rotation of the drive rotation shaft.

The structure will be described in detail. At least a pair of folding rolls arranged in the conveyance path and pressed against each other, sheet deflection means for guiding a fold of the sheet sent to the conveyance path to a nip portion of the folding roll pair, and the sheet Drive means that reciprocates between a standby position in which the deflecting means is retracted from the conveyance path and an operating position that is in contact with the circumferential surfaces of the pair of folding rolls.
The sheet deflection means comprises a driven roller that abuts one roll peripheral surface of the pair of folding rolls, and an elevating member that holds the driven roller at one end and moves from the standby position to the operating position. A drive rotation shaft connected to a drive motor (a shift motor described later) and drive transmission means for transmitting the rotation of the drive rotation shaft to the elevating member are transmitted.

  The drive transmission means transmits the rotation of the drive rotating shaft so as to move from the standby position of the elevating member to the operating position at a predetermined speed, and after the driven roller abuts the circumferential surface of the pair of folding rolls, The rotation of the drive rotation shaft is allowed without transmission.

  In this case, as in the first embodiment to be described later, the drive transmission means includes a transmission member such as a pinion-rack that moves the elevating member from the standby position to the operating position by the rotation of the drive rotation shaft, and the drive rotation shaft. It is comprised with cam members, such as a rotation cam which hold | maintains a raising / lowering member in an operating position by rotation.

  Further, as in a second embodiment described later, the drive transmission means is constituted by a cam member that moves the elevating member from the standby position to the operating position. The cam member is provided with a shift cam surface that moves the lifting member from the standby position to the operating position by the rotation of the drive rotating shaft, and a non-shift cam surface that holds the lifting member at the operating position by the rotation of the driving rotating shaft.

  In the present invention, the elevating member that moves from the standby position to the operating position can be returned from the operating position to the standby position by the rotation (reverse rotation) of the drive rotation shaft connected to the drive motor (shift motor). It can be returned by an urging spring or the like, or can be returned in conjunction with another moving member different from the drive rotating shaft.

  According to the present invention, when the sheet deflecting means for guiding the sheet to the nip portion of the pair of folding rolls is moved from the standby position to the operating position, the rotation of the drive rotation shaft is moved to the lifting member provided with the driven roller by the drive transmission means. Since it is configured to transmit the drive so as to move to the operating position at a predetermined speed, and to allow the rotation of the drive rotating shaft without transmitting the drive after the driven roller abuts the roll peripheral surface, The effect of.

  In the present invention, the rotation of the drive rotating shaft is transmitted to the elevating member by the drive transmission means so as to move from the standby position to the operating position at a predetermined speed, and the driven roller of the elevating member abuts the peripheral surface of the pair of folding rolls. Later, since the drive rotating shaft is allowed to rotate without transmitting the drive, the elevating member can guide the sheet to the roll nip portion at a constant speed. For this reason, the sheet sent to the conveyance path can be guided to the nip portion at a preset optimum speed, and the folding process can be performed without misalignment of the sheet fold.

  At the same time, after the driven roller of the elevating member comes into contact with the circumferential surface of the roll, the drive rotating shaft is allowed to rotate without displacing the elevating member. For this reason, the drive motor connected to the drive rotation shaft does not affect the position of the driven roller even if the rotation continues after the driven roller comes into contact with the circumferential surface of the roll. Accordingly, there is no need to match the stop timing of the drive motor with the timing at which the driven roller abuts the roll peripheral surface, and the stop timing and inertia are controlled by stopping the drive motor after the driven roller abuts the roll peripheral surface. There is no need.

  As described above, according to the present invention, when the driven roller is moved from the standby position outside the path to the operating position, the driven roller is moved at a constant speed when the sheet is guided to the nip portion of the pair of folding rolls. Thus, the three conditions of pressing the sheet against the roll peripheral surface with a predetermined pressure and stopping the drive motor can be set to optimum conditions without interfering with each other's motion timing.

1 is an explanatory diagram of an overall configuration of an image forming system including a sheet folding apparatus according to the present invention. FIG. 2 is an explanatory diagram of an overall configuration of a sheet folding device in the system of FIG. 1. The principal part expansion explanatory drawing in the sheet folding apparatus of FIG. FIG. 3 is an explanatory diagram of a drive unit in the apparatus of FIG. 2, (a) shows an overall configuration diagram, and (b) is an explanatory diagram of a drive transmission unit. It is explanatory drawing of 1st Embodiment of a drive transmission means, (a) is the state of a home position, (b) is the state rotated by the predetermined angle, (c) is the state which contacted the surrounding surface of the 2nd roller. Indicates. It is explanatory drawing of 1st Embodiment of a drive transmission means, (d) shows the state by which the engagement between a pinion and a rack was cancelled | released, (e) shows the state which stopped the shift motor. The control block diagram of a shift motor. Explanatory drawing of 2nd Embodiment of a drive transmission means. The conceptual diagram showing the relationship between the moving speed of a deflection | deviation member, and a sheet conveyance speed. It is a graph which shows the speed relationship of a deflecting member, (a) shows the speed of a deflecting member motor, (b) shows the speed of a deflecting member. It is explanatory drawing of the sheet folding specification in the sheet folding apparatus of this invention, (a) is a mode which folds a sheet | seat inside three at 1/3 position, (b) is a mode which Z-folds a sheet | seat at 1/3 position. (C) shows a mode in which the sheet is Z-folded at a 1/4 position. Explanatory drawing of the control structure in the system of FIG.

  Hereinafter, the present invention will be described in detail based on illustrated embodiments. FIG. 1 shows an image forming system provided with a sheet folding apparatus according to the present invention. This system includes an image forming apparatus A and a post-processing apparatus C, and a sheet folding apparatus B is attached to the post-processing apparatus C as a unit.

The image forming apparatus A is configured as a printer, a copier, a printer, or the like that sequentially forms images on sheets. The illustrated one is an image forming unit 7, a document reading unit 20, and a feeder unit (document feeding device) 25 as a composite copying machine having a copying machine function and a printer function. Further, the post-processing apparatus C is connected to the main body discharge port 18 of the image forming apparatus A, and is configured to perform post-processing such as folding, punching, stamping, and binding on the image-formed sheet. Has been. A sheet folding device B for folding the image-formed sheet is integrally provided in the post-processing device C.
Hereinafter, the sheet folding apparatus B, the image forming apparatus A, and the post-processing apparatus C will be described in this order.

[Sheet folding device]
The sheet folding apparatus B according to the present invention is built in the image forming apparatus A or the post-processing apparatus C, or is configured as an independent apparatus (stand-alone configuration). The illustrated one is arranged as an optional unit between the image forming apparatus A and the post-processing apparatus C.

  The entire structure of the sheet folding device B is shown in FIG. 2, but a carry-in port 30 and a carry-out port 31 are provided in the device housing 29, and the carry-in port 30 is located at a position continuous with the main body discharge port 18 of the image forming apparatus A on the upstream side. The carry-out port 31 is arranged at a position continuous with the sheet receiving port 69 of the downstream post-processing apparatus C. In the present invention, the sheet folding apparatus B is not provided with an independent apparatus housing 29, but may be built in, for example, the casing of the post-processing apparatus C. In this case, the carry-in port 30 and the carry-out port 31 are required. do not do. Therefore, hereinafter, the carry-in port 30 is synonymous with the carry-in unit, and the carry-out port 31 is synonymous with the carry-out unit. For convenience of explanation, the carry-in unit will be described as the carry-in port 30 and the carry-out unit will be explained as the carry-out port 31.

  As shown in FIG. 2, the carry-in port 30 and the carry-out port 31 are disposed so as to cross the apparatus housing 29, and the illustrated carry-in port 30 and the carry-out port 31 are disposed at positions that are substantially opposed in the horizontal direction. Between the carry-in port 30 and the carry-out port 31, the sheet from the carry-in port 30 is folded without being folded, and the sheet from the carry-in port 30 is folded. The 2nd conveyance path | route 33 carried out to the carry-out exit 31 is arrange | positioned. A “sheet conveying mechanism” that conveys the sheet in a predetermined direction (horizontal direction) is arranged in the first conveying path 32, and a “folding mechanism” that folds the sheet is arranged in the second conveying path 33. .

Route configuration
As shown in FIG. 2, a first transport path (hereinafter referred to as “first path”) 32 is disposed in the apparatus housing 29 between the carry-in port 30 and the carry-out port 31. As shown in the figure, this path may be arranged in a horizontal direction as a straight path, or may be arranged in a vertical direction even if it is constituted by a curved path. As described above, the first path 32 guides the sheet from the carry-in entrance 30 to the carry-out exit 31 without folding the sheet.

The second transport path (hereinafter referred to as “second path”) 33 is configured as a path for folding the sheet from the carry-in entrance 30. For this reason, the sheet is branched from the first path 32 to guide the sheet from the carry-in entrance 30 to the folding positions Np1 and Np2. At the same time, the second path 33 is arranged in a direction crossing the first path 32 as shown in FIG. 2, and the first folding position Np1 and the second folding position Np2 are set in this path.
The second path 33 includes a first switchback path 34 that guides the leading edge of the sheet for primary folding to the first folding position Np1, and a folded sheet leading edge for secondary folding of the folded sheet at the second folding position. The second switchback path 35 guides to Np2.

In this way, the second path 33 is arranged in a direction intersecting the first path 32, and the first switchback path 34 in the upper area of the first path 32 and the sheet from the intersection K in the lower area downstream (second folding). A second switchback path 35 that moves in the direction of the position Np2 is disposed oppositely.
The first switchback path 34 and the second switchback path 35 are each configured by a curved path, and are formed in a substantially S-shaped curve as shown in FIG. In the second path 33, folding processing means (folding roller mechanism) 48, which will be described later, is disposed at the first folding position Np1 and the second folding position Np2, and the folded sheet from the second folding position Np2 is directed toward the carry-out port 31. A third transport path (hereinafter referred to as “third path”) 36 is continuously provided.

The first path 32 and the second path 33 are arranged so as to cross each other, but the first switchback path 34 that guides the sheet to the first folding position Np1 is folded below the first path 32. A second switchback path 35 that guides the sheet to the downstream side may be disposed above the first path 32.
2, the first path 32 is disposed in the horizontal direction. However, when the path 32 is disposed in the apparatus housing 29 in the vertical direction, the first switchback path 34 and the second switchback path 35 are arranged in the first direction. It is also possible to arrange it opposite to the left and right areas of the path 32.

  Further, in the form shown in FIG. 2, the second switchback path 35 is configured to reverse the sheet feeding direction in order to guide the folded sheet to the second folding position Np2 in order to perform the secondary folding of the sheet. However, when the sheet is not folded second, a straight path can be used.

  A third path 36 that guides the folded sheet to the carry-out port 31 is connected to the second path 33. The illustrated third path 36 is provided between the second folding position Np <b> 2 where the sheet is secondarily folded and the carry-out port 31. The third path 36 is provided with a paper discharge path 37 for guiding the folded sheet from the paper discharge outlet 51 different from the carry-out port 31 to the storage stacker 65.

  The first switchback path 34 configured as described above is configured by a path curved in an arc shape having a curvature R1 as shown in FIG. 2, and the second switchback path 35 is configured in an arc shape having a curvature R2. It consists of a curved path. Further, the paper discharge path 37 connected to the third path 36 is also configured as a circularly curved path having a curvature R3.

  The path length (L1) of the first switchback path 34 for guiding the sheet from the first path 32 to the first folding position Np1, and the path length for guiding the first folded sheet to the second folding position Np2 The path length (L2) of the second switchback path 35 is configured such that path length L1> path length L2.

  Further, the path length L3 of the sheet discharge path 37 for guiding the folded sheet from the second folding position Np2 to the storage stacker 65 is configured to satisfy L3 <L2 <L1. This is because when the first folding position Np1 is arranged in the vicinity of the first path 32, each path length becomes L3 <L2 <L1, resulting in a compact path configuration.

  Accordingly, the first switchback path 34 having a long path length is disposed in the upper area of the first path 32, and the second switchback path 35 and the paper discharge path 37 having a short path length are disposed in the lower area so as to face the first switchback path 34. Further, a storage stacker 65 is disposed below the second switchback path 35 and the paper discharge path 37. With such a layout configuration, the inner space of the device housing 29 is concentrated.

"Route switching means"
A route switching means 63 is disposed at the intersection K between the first route 32 and the second route 33 described above. The path switching means 63 will be described with reference to FIG. 3. The sheet fed from the first path 32 is guided to the first switchback path 34 by a guide member pivotally supported by the support shaft 62x of the carry-out roller 62a (same as the first switchback path 34). The route is switched, or the route is switched to the carry-out port 31 (broken line in the figure).

  A sheet guide 61 is provided at an intersection K between the first path 32 and the second path 33. The sheet guide 61 is disposed between the first roller 41b and the pair of carry-out rollers 62a and 62b in the first path 32, and is configured to guide the sheet sent from the first path 32 to the first switchback path 34 (same as above). A shaft is supported so as to be swingable between a solid line) and a posture (broken line in the figure) for guiding to the carry-out port 31.

"Folding roller configuration"
As shown in FIGS. 2 and 3, the second path 33 is provided with a folding roller mechanism including a pair of folding rollers. The first roller 41b, the second roller 49, and the third roller 50 are disposed at the intersection K of the first path 32 and the second path 33 so as to be in pressure contact with each other (see FIG. 3).
A first folding position Np1 for first folding the sheet is formed at the pressure contact between the first roller 41b and the second roller 49, and a second folding is performed at the pressure contact between the second roller 49 and the third roller 50. A folding position Np2 is formed.

  The diameters of the first, second and third rollers are the same outer diameter in the illustrated apparatus. This may be set to an appropriate size, for example, to maximize the second roller diameter.

  Further, as shown in FIG. 3, the first roller 41 b is arranged at a position where a part of the outer periphery faces the first path 32, and the pinch roller 41 a is pressed against the roller peripheral surface. The first roller 41b and the pinch roller 41a that are in pressure contact with each other constitute a sheet feeding / conveying means of the first path 32, whereby the sheet from the carry-in entrance 30 is conveyed downstream.

[Configuration of sheet deflection means]
In the present invention, the sheet deflection means 53 for guiding the fold position of the sheet to the nip portion (first folding position) Np1 of the folding rolls 41b and 49 shown in FIG. 3 is configured as follows. FIG. 4 shows a main part of the apparatus of FIG. 3, and the configuration of the sheet deflection means 53 will be described with reference to FIG.

  As shown in FIG. 4, a pair of folding rolls 41 b and 49 are provided on the conveyance path (first path 32) for guiding the sheet from the carry-in entrance 30 to the folding processing unit. The pair of folding rolls 41b and 49 are rotated by a drive motor in the direction of the arrow shown in the figure, and the sheet is folded at the nip portion (first folding position) Np1.

  The sheet deflecting means 53 that guides (inserts) the fold position of the sheet into the nip portion (first fold position) Np1, and the operation position Ap (chain line) in the path from the standby position Wp (solid line position in FIG. 4) outside the path. Drive means 85 moving to a position).

The sheet deflecting means 53 is composed of a driven roller 53a that abuts on one roll peripheral surface p2 of the pair of folding rolls 41b and 49, and an elevating member 53c that holds the roller at one end and moves from the standby position Wp to the operating position Ap. To do.
The illustrated elevating member 53c is supported on an apparatus frame (not shown) so as to be movable between a standby position and an operating position. Although the support structure is not shown, a guide rail is provided on the apparatus frame to support the elevating member so as to slide on the rail.

The illustrated follower roller 53a is slidably supported by the elevating member 53c and is laid between the elevating member 53c and the driven roller 53a so that the pressure spring 53d presses the driven roller 53a toward the roll circumferential surface p2. Passed.
As shown in FIG. 4B, the driven roller 53a is slidably attached to the elevating member 53c integrally with the support stem 53f, and one end of the pressure spring 53d is attached to the elevating member 53c and the other end is a bracket of the driven roller 53a. Is engaged. 53g shown is a lower limit stopper.
Therefore, after the elevating member 53c moves in the direction of the arrow in FIG. 4A and the driven roller 53a comes into contact with the circumferential surface p2 of the folding roll, the pressure spring 53d accumulates the force. Due to the action of the spring, the driven roller 53a is urged to the roll peripheral surface p2 with a predetermined pressure, thereby giving a conveying force to the sheet.

As shown in FIG. 3, the elevating member 53c is integrally formed with a follower roller 53a and a curved guide 53b, and the curved guide 53b extends along the circumferential surface of the first roller 41b located on the upstream side of the pair of folding rolls. It is formed into a shape.
The drive means 85 includes a drive rotation shaft 85x connected to the shift motor MS and a drive transmission means 86 that transmits the rotation to the elevating member 53c. An embodiment of the drive transmission means 86 will be described as a first embodiment in FIG. 4 and a second embodiment in FIG. 8, but various forms can be adopted as other drive transmission means.

[First embodiment of drive transmission means]
The drive transmission means 86 shown in FIG. 4 includes a transmission means 86A that transmits the rotation of the drive rotation shaft 85x to the elevating member 53c, and a cam member 86B that holds the position without transmitting the rotation of the drive rotation shaft 85x to the elevating member 53c. It consists of.
The transmission means 86A shows a case where it is constituted by a rack 53e formed integrally with the elevating member 53c and a pinion 85p provided on the drive rotating shaft 85x. The pinion 85p and the rack 53e mesh with each other, and when the drive rotation shaft 85x rotates clockwise, the elevating member 53c moves from the standby position Wp to the operation position Ap, and when the drive rotation shaft 85x rotates counterclockwise, the drive rotation shaft 85x waits from the operation position Ap. Return to position Wp. At this time, the moving speed of the elevating member 53c coincides with the rotating speed of the drive rotating shaft 85x.

  The cam member 86B is axially supported by the drive rotating shaft 85x, and the cam surface 86y of the cam member 86B engages with the engagement roller 53h (or the projection member) of the elevating member 53c. Therefore, as described above, the driven roller 53a is attached to the elevating member 53c via the pressure spring 53d. The cam surface 86y of the cam member 86B maintains its state (operating state) even if the drive rotary shaft 85x rotates after a predetermined pressure is applied to the driven roller 53a.

That is, as shown in FIG. 4, a pinion 85p and a cam member (cylindrical cam; the same shall apply hereinafter) 86B are attached to the drive rotation shaft 85x, and this drive rotation shaft 85x has a predetermined angle range (angle θ1 shown in FIG. 4B). , The pinion 85p engages with the rack 53e and moves the elevating member 53c in the direction of the arrow.
When the drive rotation shaft 85x rotates in an angle range different from the angle θ1 (angle θ2 shown in FIG. 4B), the pinion-rack engagement is released, and the cam surface 86y is engaged with the lifting roller 53c. It is configured to engage with 53h.

In FIG. 4, a semicircular pinion 85p is formed in the angular range θ1 of the outer periphery of the drive rotation shaft 85x, and a semicircular cam surface 86y is formed in the remaining angular range θ2. The cam surface 86y has a circular shape with the same diameter. Therefore, when the drive rotary shaft 85x rotates within the angle range θ1 from the home position, the elevating member 53c moves between the standby position Wp and the operating position Ap, and when rotating within the angle range θ2, the elevating member 53c is moved to the operating position Ap. The angle range is set so that
FIG. 4 is a model of the relationship between the pinion 85p and the cam surface 86y. The pinion 85p and the cam surface 86y are both formed in a circular shape on the outer periphery of the drive rotation shaft 85x. In the angle range θ1 of the drive rotation shaft 85x, the pinion 85p and the rack 86y are engaged, and in the angle range θ2, the cam surface 86y and the engaging roller 53h are engaged to facilitate processing. I can do it.

[Operation of First Embodiment of Drive Transmission Means]
The operation of the first embodiment of the drive transmission means 86 will be described. FIG. 5A shows a state in which the drive rotary shaft 85x is at the home position. At this time, the elevating member 53c is positioned at the top dead center standby position, and the pinion 85p of the drive rotary shaft 85x is engaged at the lower limit position of the rack 53e. Match. A position sensor (position detection sensor) Ss is disposed at this position, and the state where the elevating member 53c has moved to the upper limit position is detected, and the drive of the shift motor MS is stopped. 53z shown in the figure is a flag provided on the elevating member 53c.

  FIG. 5B shows a state in which the drive motor shaft 85x is rotated by a predetermined angle by rotating the shift motor MS. At this time, the pinion 85p of the drive rotating shaft 85x meshes with the rack 53e and moves the elevating member 53c from the standby position to the operating position by a predetermined amount. This figure shows a state in which the driven roller 53a first comes into contact with the sheet in the first path. At this time, the shift motor MS is started up so as to move the drive rotary shaft 85x at a constant speed.

  FIG. 5C shows a state in which the driven roller 53 a of the elevating member 53 c is in contact with the peripheral surface p <b> 2 of the second roller 49. At this time, the driving force of the drive rotary shaft 85x acts on the lifting member 53c so that the pinion 85p meshes with the rack 53e and moves the lifting member 53c further downward.

  FIG. 6D shows a state where the engagement between the pinion 85p and the rack 53e is released, and the engagement between the cam surface 86y and the engagement roller 53h is started. When the drive rotation shaft 85x rotates in the clockwise direction, the cam surface 86y moves down the engagement roller 53h. At this time, accumulated force is applied to the pressure spring 53d, and the driven roller 53a is pressed against the roll peripheral surface p2 with a predetermined pressure. At this time, the driven roller 53a is located at the operating position Ap.

  In FIG. 6E, after the cam surface 86y presses the driven roller 53a against the roll circumferential surface p2, the shift motor MS is stopped. When the power supply to the shift motor MS is stopped, the drive rotary shaft 85x continues to rotate with its inertia. At this time, the cam surface 86y is kept in pressure contact with a predetermined pressure without moving the position of the driven roller 53a in a state where the driven roller 53a sandwiches the sheet between the roller peripheral surface p2. The shift motor MS gradually stops due to inertia.

  When the elevating member 53c is returned from the operating position to the standby position, the control means 95 rotates the shift motor MS in the reverse direction to rotate the drive rotating shaft 85x in the counterclockwise direction. Then, the cam surface 86y also rotates counterclockwise, and the pinion 85p engages with the rack 53e by the action of the pressure spring 53d. With the reverse rotation of the drive rotation shaft 85x, the driven roller 53a is moved from the state of FIG. 6E to the standby position in the order of FIG. 6D, FIG. 5C, FIG. 5B, and FIG. Return to.

"Control configuration of shift motor"
FIG. 7 shows a control configuration of the shift motor MS. In the shift motor MS, the elevating member 53c stops at the home position (standby state in FIG. 5A), and the elevating member 53c is held in position by the rotational load. Then, after a control means (CPU) 95 to be described later detects the leading edge of the sheet by the first sensor S1, the shift motor MS is activated at an estimated time that the sheet moves by a predetermined amount based on the detection signal and the crease position. Then, the elevating member 53c moves from the standby position toward the operating position. Then, after the expected time (z1) when the shift motor MS reaches a predetermined constant speed, the driven roller 53a contacts the seat of the first path 32 (z2).

  That is, the control means 95 sets the seat and motor start timing at the timing when the driven roller 53a contacts the seat after the elevating member 53c reaches a constant speed (V1) from the start of the shift motor MS. In this state, the elevating member 53c deflects the sheet to the first folding position Np1 at a constant speed V1. The movement of the elevating member 53c is transmitted to the rack 53e by the pinion 85p with the rotation of the drive rotary shaft 85x.

  Therefore, the driven roller 53a of the elevating member 53c comes into contact with the circumferential surface of the folding roll, or immediately before that, the rotation of the drive rotation shaft 85x releases the pinion-rack engagement and the cam surface 86y engages with the engagement roller 53h (z3). ). Then, the cam surface 86y pushes the elevating member 53c down to the folding roll side. At this time, the pressure spring 53d accumulates power, and the driven roller 53a engages with the circumferential surface of the folding roll with a predetermined pressure (z4).

  Next, after the driven roller 53a comes into contact with the folding roll circumferential surface p2 and the sheet is pressed against one of the pair of folding rolls with a predetermined pressure, the control means 95 shifts the shift motor at an appropriate timing at which the operation is reliably achieved. The power supply of the MS is turned off (z5). Then, the rotation shaft of the shift motor MS and the drive rotation shaft 85x are stopped after the inertia rotation. At this time, the elevating member 53c is engaged with the cam surface 86y and the engaging roller 53h, and the circular cam surface 86y maintains its position (operating position) without moving the elevating member 53c. Accordingly, the inertial rotation of the shift motor MS and the drive rotary shaft 85x does not affect the sheet pressing operation of the driven roller 53a.

  By such control, the elevating member 53c guides the sheet of the first path 32 to the folding roll nip point at a constant speed (design calculation value) set in advance, and at the same time, the pressure contact force between the driven roller 53a and the roll periphery p2 is also set in advance. Further, the stop timing of the shift motor MS does not affect the sheet guiding operation.

[Second Embodiment of Drive Transmission Means]
8 (a) and 8 (b) show different embodiments of the drive transmission means 86. FIG. In addition, about the structure same as FIG. 4, the same number is attached | subjected and description is abbreviate | omitted. The illustrated one shows a case where the drive transmission means 86 is constituted by a rotating cam.

  First, in the embodiment shown in FIG. 8A, a rotary cam 87 is integrally attached to a drive rotary shaft 85x connected to a shift motor MS. The rotation cam 87 has a shift cam surface 87a in which the displacement amount increases constant (linearly) with respect to the displacement angle in the angle range θ1, and a non-shift cam surface 87b in which the displacement amount is zero with respect to the displacement angle in the angle range θ2. Is formed.

  On the other hand, the elevating member 53c has a follower roller 53a, a pressure spring 53d, and a curved guide 53b attached to the elevating member 53c in the same manner as described above. The elevating member 53c is integrally provided with a support stem 53i, and this stem is slidably fitted and supported by a sleeve 53j fixed to the apparatus frame. Although not shown, the pressure spring 53d is slidably engaged with the elevating member 53c, and the pressure spring 53d is disposed between the elevating member 53c and the driven roller 53a. Has been.

  The rotary cam 87 is engaged with the elevating member 53c configured as described above. When the drive rotary shaft 85x rotates within the angle range θ1, the shift cam surface 87a engages with the elevating member 53c and moves downward at a predetermined speed (V1). When the drive rotation shaft 85x rotates within the angle range θ2, the non-shift cam surface 87b engages with the elevating member 53c and is held at that position.

  Next, in the embodiment shown in FIG. 8B, the rotary cam 88 and the elevating member 53 c are engaged by the transmission lever 89. In the embodiment shown in FIG. 8A, the rotating cam is enlarged due to the movement stroke of the elevating member 53c. Therefore, the amount of movement of the elevating member 53c is increased by the transmission lever 89. For this reason, the transmission lever 89 is set such that the engagement point La between the cam surface and the elevating member 53c is short and the latter is long so that the lever action acts around the rotation support shaft 89x.

  Also in the embodiment shown in FIGS. 8A and 8B, the control of the shift motor MS is the same as that in the first embodiment described in FIG. 7, and the same operation is obtained.

  In the apparatus shown in FIG. 2, the sheet deflecting means for guiding the sheet to the nip portion of the pair of folding rolls includes a primary folding deflecting means 53 for primarily folding the sheet, and a secondary for further folding the primarily folded sheet. Arranged as folding deflecting means 54. This secondary folding deflecting means 54 also adopts the same structure as the primary folding deflecting means 53 described above.

[Sheet transport mechanism]
The sheet conveying mechanism of the first path 32 and the second path 33 will be described with reference to FIGS. In the first path 32, a pair of carry-in rollers 40a and 40b is arranged at a carry-in entrance (carry-in section) 30 and carries a sheet sent from the outside of the apparatus. A pair of paper feeding and conveying rollers is disposed between the intersection K of the first path 32 and the second path 33 and the carry-in roller pairs 40a and 40b. The illustrated pair of paper feed / conveying rollers includes a first roller 41b and a pinch roller 41a pressed against the first roller 41b.

  In the first path 32, a resist area Ar is provided on the downstream side of the carry-in roller pair 40a, 40b, and a gate stopper 43 is disposed in the resist area Ar. The gate stopper 43 is configured to be swingable about the support shaft 43x, and temporarily corrects the leading edge of the sheet by the locking surface 43s of the leading end to correct the resist. Therefore, the gate stopper 43 is connected to an operating solenoid (not shown).

  A first roller 41b, a second roller 49, and a third roller 50 are disposed in pressure contact with each other in the second path 33, and a sheet discharge roller 67 is disposed in the sheet discharge path 37. Further, no sheet conveying mechanism is arranged in the first switchback path 34 and the second switchback path 35.

"Sheet edge detection sensor"
As shown in FIG. 2, the first sensor S <b> 1 that detects the edge of the sheet is disposed in the first path 32 described above, and the edge (leading edge and trailing edge) of the sheet carried into the first switchback path 34 is arranged. To detect. The second switchback path 35 is provided with a second sensor S2 for detecting the edge of the sheet to be carried. The first sensor S1 and the second sensor S2 detect the edge of the sheet in order to determine the fold position of the sheet, and the operation thereof will be described later together with the folding specification described later.

"Sheet conveyance control"
As described above, the first folding position Np1 of the first roller 41b and the second roller 49 and the primary folding deflecting means 53 are disposed at the intersection K. Further, a pair of sheet feeding and conveying rollers 41a and 41b is arranged on the first path 32 on the upstream side of the intersection K, and the first switchback path 34 located on the downstream side of the intersection K has a conveying means for restraining the sheet. Is not arranged. For this reason, a plurality of transport mechanisms do not interfere with each other to cause uneven transport speed.
The primary folding deflection means 53 includes a driven roller 53a that is in pressure contact with the circumferential surface of the second roller 49 located downstream in the traveling direction of the sheet moving along the first path 32. The driven roller is a standby position Wp outside the path. To and from the operating position Ap in pressure contact with the circumferential surface of the roller.

  Therefore, sheet conveyance control will be described with reference to FIG. As shown in the figure, the speed V1 for moving the driven roller 53a of the primary folding deflecting means 53 from the standby position Wp to the operating position Ap is set higher than the sheet speed V2 for moving the first path 32 (for example, V1 = 1. 7 × V2 speed setting). For this reason, the peripheral speed V2 of the pair of paper feed rollers 41a and 41b and the lowering speed V1 of the elevating member 53c are set to V1> V2. This speed control controls the rotation speeds of the transport motor MF of the first roller 41b and the shift motor MS of the primary folding deflection member 53.

  The rotational speed control of the shift motor MS is shown in FIG. In FIG. 9A, the elevating member 53c is accelerated at a speed V1 from a top dead center (solid line in FIG. 9) to a point P3 where the driven roller 53a contacts the sheet fed through the first path 32, and the driven roller 53a is a second roller. A case is shown in which after abutting on 49, the vehicle decelerates and stops after a predetermined time. FIG. 6B shows a case where the elevating member 53c is stopped at the timing when the driven roller 53a contacts the second roller 49.

  The nip pressure between the pinch roller 41a and the first roller 41b at the pressure contact P1 shown in FIG. 9 is set to 4 kg. This is an optimum nip pressure when skew correction is performed on a sheet that has been loaded. The nip pressure between the driven roller 53a and the second roller 49 at the pressure contact P2 is set to 1.5 kg. That is, by setting the sheet nip pressure at the pressure contact P1 to be larger than the sheet nip pressure at the pressure contact P2 (about 3 times in the illustrated apparatus), the sheet folding position is restricted to the pressure contact P1.

  As described above, the sheet fed by the pair of sheet feeding and conveying rollers 41a and 41b and nipped and conveyed only by the pair of sheet feeding and conveying rollers is lowered at the intersection K by the driven roller 53a in the direction perpendicular to the conveying direction. V1 is set faster than the sheet speed V2. For this reason, the movement displacement amount of the sheet front end portion in the first switchback path 34 is larger than the movement displacement amount of the sheet rear end portion fed out by the pair of sheet feed conveyance rollers 41a and 41b. That is, as the driven roller 53a moves, the sheet moves with a larger displacement amount on the leading end side than on the trailing end side. As a result, the sheet is guided to the first folding position Np1 with reference to the pressure contact P1 of the pair of paper feed / conveying rollers 41a and 41b at the rear end.

  At the same time, the friction load (conveyance load) of the first switchback path 34 acts on the leading edge of the sheet, so that the leading edge of the sheet is guided to the first folding position Np1 by the driven roller 53a without shaking.

  Further, the first switchback path 34 is configured in a curved path shape. As a result, the posture of the leading end of the sheet fed to the path by the pair of sheet feeding and conveying rollers 41a and 41b does not fluctuate, and a curved path is formed when the driven roller 53a is fed to the first folding position Np1. The friction load (conveyance load) of the guide member that acts is greatly affected as compared with the linear path.

Further, in FIG. 9, the pressure contact of the pair of paper feeding and conveying rollers 41a and 41b is P1, the contact point where the driven roller 53a is in contact with the peripheral surface of the second roller 49, P2, and the sheet where the driven roller 53a moves along the first path 32 and the first When the contact point in contact with P3 is P3, the sheet conveyance length LS2 between P1 and P2 (the broken line length in FIG. 9) is longer than the sheet conveyance length between P1 and P3 (LS1: see FIG. 9), so that LS2> LS1. Set.
As a result, when the sheet fed by the pair of paper feeding and conveying rollers 41a and 41b is guided to the first folding position Np1 by the driven roller 53a, LS2> LS1 is set and V1> V2 is set at the same time. The rear end portion is not pulled from the pressure contact P1 of the pair of paper feeding and conveying rollers 41a and 41b. Accordingly, the sheet is guided to the first folding position Np1 with reference to the pressure contact P1 at the rear end.

Further, when the stroke from the contact point P3 to the contact point P2 is LS3, the speed is set so that the following equation is established.
(LS2−LS1) / V2≈LS3 / V1 (Formula 1)
As a result, when the moving speed of the driven roller 53a is slow, the point (contact point) P3 in contact with the sheet is displaced.
At the same time, sagging occurs in the sheet between the pressure contact P1 of the pair of paper feeding and conveying rollers 41a and 41b and the driven roller 53a. It is possible to prevent the occurrence of folding misalignment, folding folds and the like due to the misalignment of the sheet engaging point and the sagging of the sheet.

  The second path 33 carries a sheet into the first switchback path 34 by a pair of carry-in rollers 40a and 40b and a registration roller (first roller) 41b arranged in the first path 32, and the first and second rollers 41b and 49 convey this sheet to the downstream side.

  The illustrated apparatus is characterized in that the sheet conveying mechanism disposed in the first and second paths 32 and 33 is simplified, and the apparatus is reduced in size, silence, and power consumption is reduced. Therefore, in the first path 32, a part of the outer periphery of the folding roller (first roller 41b) disposed in the second path 33 is disposed between the carry-in roller pair 40a, 40b and the carry-out roller pair 62a, 62b. It is arranged to face.

  A pinch roller 41 a is arranged on the outer periphery of the first roller 41 b, and the sheet sent from the pair of carry-in rollers 40 a and 40 b is sent to the first switchback path 34. As a result, it is not necessary to arrange a special transport roller in the first path 32, and the transport mechanism is simplified.

[Folding specification]
Next, a sheet folding method by the folding processing means 48 will be described with reference to FIG. A normal image-formed sheet may be folded in two or three with a margin for filing finish, or may be folded in two or three for letter finishing. In addition, when folding in three, there are cases where Z-folding and inner three-folding are performed. In FIG. 11, (a) shows an inner three fold, (b) shows a Z fold, and (c) shows a ¼ Z fold.

  In the case of folding in half, the sheet sent to the second path 33 is moved to the 1/2 position of the sheet size by the first second rollers 41b and 49, or the 1/2 position of the sheet edge is left at the end of the sheet. Fold together (primary fold).

  In the case of three-fold folding, the sheet sent to the second path 33 is 1/3 position of the sheet size by the first 2nd rollers 41b and 49 or 1/3 position of the sheet edge leaving a binding margin. Fold together (primary fold). The folded sheet is folded by the second third rollers 49 and 50 at the 1/3 position (secondary folding) and sent to the third path 36.

In the case of three-fold folding, as shown in FIG. 11A, when the inner three-fold is performed, the sheet fed to the second path 33 is fed by the first second rollers 41b and 49 to the sheet rear end side 1/3. The positions are folded, and then the 1/3 position on the sheet front end side is folded.
Similarly, at the time of Z-folding, the sheet fed to the second path 33 is folded at the sheet leading end side 1/3 position by the first second rollers 41b and 49, and then the sheet trailing end side 1/3 position is folded.

  Further, in the case of three-fold folding, when the quarter position shown in FIG. 11C is Z-folded, the sheet fed to the second path 33 is fed by the first second rollers 41b and 49 to the sheet rear end side 1 / 4 positions are folded, and then the 1/2 position of the sheet is folded.

[Control means]
The control means 95 for folding the sheet is configured as follows. A control CPU is mounted on the sheet folding device B described above, or a folding processing control unit is provided in the control unit 91 of the image forming apparatus A. The control unit is configured so that the following operation is possible.

First, stopper means (not shown) for restricting the position of the sheet leading edge to the first switchback path 34 and the second switchback path 35 of the second path 33, or sensor means (S1, S2 shown in the figure) for detecting the position of the sheet leading edge. Is provided.
In the illustrated apparatus, the first sensor S1 is disposed in the first switchback path 34, and the second sensor S2 is disposed in the second switchback path 35. The control unit 95 is configured to calculate the timing at which the sheet fold position reaches a predetermined position based on the sheet size information sent from the image forming apparatus A and the detection signal from the sensor S1 (S2).

  Therefore, description will be given according to the control block diagram shown in FIG. In the image forming apparatus A, the controller panel 15 and the mode setting unit 92 are provided in the control CPU 91. The control CPU 91 controls the paper feeding unit 3 and the image forming unit 7 in accordance with the image forming conditions set on the controller panel 15. Then, the control CPU 91 transfers data and commands necessary for post-processing such as “post-processing mode”, “job end signal”, and “sheet size information” to the control means 95 of the post-processing apparatus C.

  The control means 95 of the post-processing apparatus C is a control CPU and includes a post-processing operation control unit 95a. The control CPU 95 receives detection signals from the first sensor S1 and the second sensor S2. Further, the control CPU 95 transmits “ON” and “OFF” control signals to the driving means (solenoid: not shown) provided in the gate stopper 43 and the path switching means 63.

  The control CPU 95 stores in the ROM 96 a folding process execution program for controlling the transport motor MF, the shift motor MS, the driving means, and the path switching means 63 so as to execute the folding specifications described above. The RAM 98 stores data for calculating the sheet crease by the crease position calculation means 97 and the operation timing time of the shift motor MS as data.

The fold position calculation means 97 calculates a fold position (dimension) from the leading end of the sheet (distal end in the paper discharge direction) from the “sheet length size”, “folding specification”, and “binding margin dimension”. It consists of For example, in the two-fold mode, the sheet is folded at a half position in the paper discharge direction, or folded at a half position leaving a preset binding margin. The crease position is calculated by, for example, [{(sheet length size) − (binding margin)} / 2].
In the three-fold mode, the fold position is calculated according to the folding specifications such as letter fold (inner fold, Z fold), filing fold (1/4 Z fold, Z fold).

[Output path configuration]
The folded sheets folded in half as described above are sent to the third path 36 from the pressure contacts of the second and third rollers 49 and 50. Then, the sheet is further folded by an additional folding roller 64 in pressure contact with the second roller 49 and guided to the third path 36. The third path 36 joins the first path 32 as described above. Branching from the third path 36, a paper discharge path 37 is continuously provided via a path switching flapper 66, and this paper discharge path 37 guides the folded sheet to a storage stacker 65 disposed below the second path 33. To do. This paper discharge path is configured as described above with a curvature R3. Reference numeral 67 in the figure denotes a paper discharge roller disposed in the paper discharge path 37.

  Therefore, sheets that are folded into letter specifications such as inner three-fold or 1 / 3Z-fold that do not need to be transferred to the post-processing apparatus C are accommodated in the storage stacker 65 without being transferred to the carry-out port 31.

  Of the folded sheets sent to the third path 36, the sheet to be transferred to the post-processing apparatus C and to be post-processed is transferred toward the outlet 31 by the pair of discharge rollers 62. In this case, the determination as to whether or not to perform post-processing is configured such that, for example, the controller panel 15 sets the post-processing conditions simultaneously with the image forming conditions. Then, it is configured to be carried out to the storage stacker 65 or to be transferred to the post-processing apparatus C according to the set finishing conditions.

[Image forming apparatus]
The image forming apparatus A has the following configuration as shown in FIG. This apparatus sends a sheet from the sheet feeding unit 3 to the image forming unit 7, prints the sheet on the image forming unit 7, and then carries out the sheet from the main body discharge port 18. The sheet feeding unit 3 stores sheets of a plurality of sizes in sheet feeding cassettes 4 a and 4 b, and separates designated sheets one by one and feeds them to the image forming unit 7. The image forming unit 7 includes, for example, an electrostatic drum 8, a print head (laser light emitting device) 9 and a developing device 10 arranged around the electrostatic drum 8, a transfer charger 11, and a fixing device 12. An electrostatic latent image is formed by the light emitting device 9, toner is attached to the developing device 10, an image is transferred onto the sheet by the transfer charger 11, and heat fixing is performed by the fixing device 12.

  The sheets on which images are formed in this way are sequentially carried out from the main body discharge port 18. 13 is a circulation path. The sheet printed on the front side from the fixing device 12 is turned upside down through the main body switchback path 14 and then fed again to the image forming unit 7 to be printed on the back side of the sheet. This is the path for duplex printing. The sheet printed on both sides in this way is turned upside down by the main body switchback path 14 and then carried out from the main body discharge port 18.

  An image reading unit 20 shown in FIG. 1 scans an original sheet set on the platen 21 with a scan unit 22 and electrically reads it with a photoelectric conversion element (not shown). The image data is digitally processed by the image processing unit, for example, and then transferred to the data storage unit 16 to send an image signal to the laser emitter 9. Reference numeral 25 denotes a feeder device that feeds a document sheet stored in the stacker 26 to the platen 21.

  The image forming apparatus A having the above-described configuration is provided with a control unit (controller) (not shown), and image forming conditions such as sheet size designation, color / monochrome printing designation, print number designation, single-sided / double-sided printing designation, and enlargement from the controller panel 15. -Printout conditions such as reduced print designation are set.

  On the other hand, in the image forming apparatus A, image data read by the scan unit 22 or image data transferred from an external network is accumulated in the data storage unit 16, and the image data is transferred from the data storage unit 16 to the buffer memory 17. The data signal is sequentially transferred from the buffer memory 17 to the print head 9.

  From the controller panel 15, the post-processing conditions are also input and designated simultaneously with the image forming conditions. As the post-processing conditions, for example, “print-out mode”, “staple binding mode”, “sheet bundle folding mode”, or the like is selected. As the post-processing conditions, the folding specifications in the sheet folding apparatus B described above are set.

[Post-processing equipment]
The post-processing apparatus C has the following configuration as shown in FIG. This apparatus includes a sheet receiving port 69, a sheet discharge stacker 70, and a post-processing path 71 in an apparatus housing 68. The sheet receiving port 69 is connected to the carry-out port 31 of the above-described sheet folding apparatus B, and is configured to receive a sheet from the first conveyance path 32 or the third conveyance path 36.

  The post-processing path 71 is configured to guide the sheet from the sheet receiving port 69 to the paper discharge stacker 70, and a processing tray 72 is provided in this path. Reference numeral 73 in the drawing denotes a paper discharge port for collecting sheets from the post-processing path 71 on a processing tray 72 arranged on the downstream side. A punch unit 74 is disposed in the post-processing path 71. A paper discharge roller 75 is disposed at the paper discharge port 73, and sheets from the sheet receiving port 69 are stacked on the processing tray 72.

  The processing tray 72 switches back the sheet from the post-processing path 71 (conveying direction reverse) and collects and aligns it on a rear end regulating member (not shown) provided on the tray. For this reason, a forward / reverse roller 76 for switching back the sheet from the sheet discharge port 73 is provided above the tray. Further, the processing tray 72 is connected to the paper discharge stacker 70, and the sheet from the paper discharge port 73 is supported by the paper discharge stacker 70 at the front end side and the processing tray 72 at the rear end side (bridge support).

  The processing tray 72 is provided with a staple unit 77 for binding the sheet bundle positioned on the trailing edge regulating member. The sheet bundle stacked on the tray 72 is stapled and then conveyed to the paper discharge stacker 70. The illustrated stacker 70 is provided with an elevator mechanism (not shown) that moves up and down according to the amount of stacked sheets.

A image forming apparatus B sheet folding apparatus C post-processing apparatus 32 first transport path 33 second transport path 34 first switchback path 35 second switchback path 36 third transport path 41b first roller 49 second roller 50 third Roller 53 sheet deflection means 53a driven roller 53b curved guide 53c elevating member 53d pressure spring 53e rack 53f support stem 53g lower limit stopper 53h engagement roller 53i support stem 53j sleeve 85 drive means 85x drive rotation shaft 85p pinion 86 drive transmission means 86y cam Surface 86A Transmission means 86B Cam member (cylindrical cam)
87 Rotating cam 87a Shift cam surface 87b Non-shift cam surface 88 Rotating cam 89 Actuating lever

Claims (9)

A roll pair Ri Ori disposed conveying path of the sheet,
Sheet deflection means for guiding the sheet to the nip portion of the pair of folding rolls;
Drive means for reciprocating between an operating position abutting the sheet deflecting means on the roll circumferential surface of the folding roller pair and a standby position outside the transport path,
With
The sheet deflection means includes
A driven roller in contact with one roll peripheral surface of the pair of folding rolls;
A lifting member causes movement to the operating position from the standby position said driven roller to hold,
Consists of
The driving means includes
A drive rotary shaft coupled to the drive motor;
Drive transmission means for transmitting the rotation of the drive rotation shaft to the elevating member;
Consists of
The drive transmission means is
Drive transmission to the elevating member so that the driven roller moves at a constant speed from the standby position to the operating position;
The sheet folding device according to claim 1, wherein after the driven roller is moved to the operating position , the drive rotating shaft is allowed to rotate without transmitting the drive to the elevating member . The drive transmission means is
After moving the elevating member from the standby position to the operating position by the rotation of the drive rotation shaft,
The sheet folding apparatus according to claim 1, further comprising a cam member that holds the elevating member in an operating position. The drive transmission means is
The rotation of the drive rotation shaft, a drive transmission operation in which the elevating member moves from a standby position to an operating position;
3. The sheet folding according to claim 1, wherein the driven roller performs a non-drive transmission operation for holding the elevating member in an operating position in a state where the driven roller is in contact with a peripheral surface of the pair of folding rolls. apparatus. The drive transmission means is
A transmission member that moves the elevating member from a standby position to an operating position by rotation of the drive rotation shaft;
A cam member that holds the elevating member in an operating position by rotation of the drive rotation shaft;
The sheet folding apparatus according to claim 1, wherein the sheet folding apparatus is configured as follows. The transmission member is composed of a pinion connected to a drive rotation shaft and a rack disposed on the elevating member,
The sheet folding apparatus according to claim 4 , wherein the cam member includes a rotation cam connected to a drive rotation shaft and an engagement roller disposed on the elevating member. The drive transmission means is
It is composed of a cam member that moves the lifting member from the standby position to the operating position,
This cam member
A shift cam surface that moves the elevating member from a standby position to an operating position by rotation of the drive rotation shaft;
A non-shift cam surface that holds the elevating member in the operating position by rotation of the drive rotation shaft;
The sheet folding apparatus according to claim 1, wherein the sheet folding apparatus is provided. The sheet folding member according to any one of claims 1 to 6 , wherein the sheet deflecting member is provided with a pressure spring that presses the driven roller against a roll peripheral surface of the pair of folding rolls. apparatus. The drive rotation shaft is connected to a drive motor, and the drive motor is controlled to stop driving based on a position detection signal from a position detection sensor disposed on the elevating member. sheet folding apparatus according to any one of 1 to 7. The elevating member is provided with a curved guide together with the driven roller, the driven roller is disposed on one side of the folding roll pair, and the curved guide is disposed on the other side of the roll. The sheet folding apparatus according to claim 1 or 2 .

Images