JP4204721B2 - Recording paper post-processing device of image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording paper post-processing apparatus of an image forming apparatus that can be used by being attached to an image forming apparatus such as a copying machine, a printer, or a complex machine thereof, and in particular, can perform a folding process on a recording paper bundle.
[0002]
[Prior art]
Various recording paper post-processing devices that can bundle and align a plurality of recording sheets on which images have been recorded by an image forming apparatus such as a copying machine and can perform post-processing on the aligned recording sheet bundle have been proposed and developed. Yes.
[0003]
For example, as described in JP-A-7-48062, as a recording paper post-processing device, the central portion of the recording paper bundle is saddle-stitched, and the saddle-binding portion can be folded in a middle so that simple bookbinding can be performed. Is known. This recording paper post-processing device comprises a pair of half-folding rollers and a half-folding plate that pushes the saddle-stitched portion of the recording paper bundle toward the middle folding rollers for the middle folding process of the recording paper bundle. A half-folding processing device is provided.
[0004]
[Problems to be solved by the invention]
By the way, in the case of performing the folding process with the above-described folding processing apparatus, first, the leading end of the folding plate comes into contact with the middle of the recording sheet bundle and then the leading end of the folding plate is the recording sheet. While pushing the bundle, it moves forward toward the nip portion of the center folding roller. As a result, the recording paper bundle is pushed into the nip portion, and is bent at the nip portion by the pressing force of the center folding roller.
[0005]
Normally, during this half-folding process, the front end of the half-fold plate is also advanced to the nip portion in order to firmly push the recording paper bundle to the nip portion with the half-fold plate. Accordingly, the recording paper bundle is subjected to the middle folding process with the pressing force of the middle folding roller while being sandwiched between the middle folding plate and the leading end of the middle folding roller at this nip portion. Is reduced by the thickness of the sandwiched folding plate and the fold becomes sweet.
[0006]
In addition, since the center folded plate normally contacts the recording sheet bundle in the entire width direction at the leading end, the entire width direction of the leading end of the folded middle plate is sandwiched between the nip portions of the center folding roller. As a result, the pressing force of the half-fold roller acting on the recording paper bundle is greatly reduced over the entire width direction, in other words, the folding is sweet over the entire width direction of the recording paper bundle. However, there is a possibility that reliable half-folding of the recording paper bundle cannot be performed, which is a problem.
[0007]
SUMMARY OF THE INVENTION In view of the above circumstances, an object of the invention according to claim 1 is to enable reliable folding processing of a bundle of recording paper at a low cost.
[0008]
According to the second aspect of the present invention, as much as possible a trace is not left when the recording paper bundle is pressed in the middle folding process, and the bending force of the recording paper bundle by the middle folding roller is not reduced as much as possible. An object is to perform a more reliable half-folding process.
[0009]
An object of the present invention is to enable stable half-folding processing.
[0010]
The invention according to claim 4 is to prevent a bending failure such as a deflection or a bulge in the central portion of the recording paper bundle so that a reliable and stable middle folding process can be performed. And
[0011]
[Means for Solving the Problems]
For this reason, the invention according to claim 1 is directed to an intermediate folding plate that bites and folds a blade-shaped center folding plate that advances and retreats toward the center folding portion of the recording paper bundle and the recording paper bundle extruded by the center folding plate. A recording paper bundle post-processing device of an image forming apparatus having a center folding processing device having a roller, wherein a plurality of protrusions are provided at a tip of the center folding plate, and the center folding plate faces a nip portion of the center folding roller. When moving forward, only the protrusions are in contact with the recording paper bundle. On the other hand, it is provided with a saddle stitching processing device for driving a staple with a stapler at the center of the recording paper, and the protruding portion of the half-fold plate is attached to the binding needle driven into the recording paper bundle by the saddle stitching processing device. Provided at a position where it abuts Is.
[0013]
Claim 2 The invention described in claim 1 In the described invention, the protruding portion of the middle folded plate is provided symmetrically with respect to the center position of the middle folded plate.
[0014]
Claim 3 The invention described in claim 1 In the described invention, three protrusions of the middle folded plate are provided symmetrically with respect to the center position of the middle folded plate.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows an overall schematic diagram of a recording paper post-processing apparatus of an image forming apparatus according to the present invention. The recording paper post-processing device 1 of the image forming apparatus of this embodiment includes an end-face binding processing device 4, a saddle-stitching processing device 5, and a half-folding processing device 6 as a post-processing unit. In addition, each processing apparatus except the half-fold processing apparatus is installed so as to share the post-processing tray 3 which is a recording sheet alignment tray. The recording paper post-processing apparatus is used by being attached to the image forming apparatus. For example, as the image forming apparatus of this embodiment, the copying machine 2 is used. Other suitable equipment can be used.
[0016]
An entrance guide plate 11 is provided between the recording paper post-processing apparatus 1 and the copying machine 2, and the recording paper on which an image is recorded by the copying machine 2 is guided by the entrance guide plate 11 to be recorded on the recording paper. It is fed into the post-processing device 1. In addition, conveyance rollers 12A and 12B are installed in the recording paper post-processing apparatus 1 in the vicinity of the inlet guide plate 11, and are conveyed into the recording paper post-processing apparatus 1 through the conveyance rollers 12A and 12B. The recording sheet that has been fed is diverted in two directions depending on whether post-processing is performed or not. For this reason, the image forming apparatus 2 is provided with a separation claw 13 that is operated by a solenoid (not shown) to sort the transport direction.
[0017]
In this embodiment, when the recording sheet on which the image is recorded is conveyed leftward in the horizontal direction in FIG. 1, the mode shifts to a non-post-processing mode in which no post-processing is performed. The recording paper that has shifted to the non-post-processing mode is transported as it is along the substantially straight non-post-processing transport path α by the transport roller 12C and the paper discharge roller 12D, and is discharged to the outside of the recording paper post-processing apparatus 1. The
[0018]
On the other hand, when the recording paper is conveyed downward in FIG. 1, the recording paper shifts to the post-processing mode.
[0019]
That is, in this post-processing mode, the recording paper is transported along the substantially U-shaped post-processing transport path β via the transport rollers 12E to 12G, the staple discharge roller 12H, and a guide plate (not shown). After that, it is discharged to the post-processing tray 3. In addition, a brush roller (not shown) is integrated with the staple discharge roller 12H, and the recording paper is moved back and forth in the vicinity of the staple discharge roller 12H and downstream in the recording paper conveyance direction. A tapping roller 12I is provided to drop the processing tray 3 downward.
[0020]
As shown in FIG. 2, the post-processing tray 3 includes a rear end reference fence 31 provided in parallel to the horizontal direction X and a jogger fence 32 provided in the Y direction orthogonal to the rear end reference fence 31. Yes. Prior to post-processing the recording paper, the post-processing tray 3 is aligned with the lower end portion of the recording paper bundle P by the rear end reference fence 31 and is moved by the jogger fence 32 operated by the jogger fence drive motor 32A. The left and right end portions of the recording paper bundle P are aligned.
[0021]
Further, as shown in FIG. 3, a recess 33 is formed in the post-processing tray 3 in the vicinity of the intermediate portion in the vertical direction. In the post-processing tray 3 of this embodiment, the lower side 3D portion with respect to the recess 33 is inclined by 75 ° with respect to the horizontal direction, and the upper side 3U is similarly inclined by 65 °. The overall shape is a substantially square shape (a shape in which the central portion protrudes in a convex shape). Note that these inclination angles are not particularly limited to those in this embodiment, and various suitable inclination angles may be used.
[0022]
Furthermore, the post-processing tray 3 is provided with an endless belt (not shown) and a discharge claw that is attached to the endless belt and moves in the vertical direction along the post-processing tray 3. While supporting the lower part of the aligned recording paper bundle P, for example, the recording paper bundle P that has undergone the end face binding process is discharged from the post-processing tray 3 or conveyed upward for the saddle stitching process. ing.
[0023]
An end surface binding processing device 4 shown in FIG. 1 performs binding processing with a stapler in the vicinity of the lower end surface of a bundle of recording sheets conveyed to the post processing tray 3 and aligned, and a rear end reference fence 31 (see FIG. 3). A stapler (not shown) is provided at the lower end of the nearby post-processing tray 3. In the end face binding operation performed here, a plurality of modes of binding processing including oblique binding can be performed.
[0024]
The saddle stitching processing device 5 performs a binding process collectively with a pair of left and right staples at the center of the bundle of recording sheets conveyed to the post-processing tray 3 and aligned there. In this embodiment, as shown in FIG. 3, two saddle-stitching staplers 51 hold a fixed interval (120 mm in this embodiment) in the vicinity of the recess 33 on the center side of the post-processing tray 3, and The rear end reference fence 31 is provided in parallel.
[0025]
As shown in FIG. 3, the stapler unit 51 includes a stapler main body 51A, a pusher 51B that pushes and pushes the recording paper bundle by an appropriate means (not shown) when the recording paper bundle is bound, and a binding needle. The clincher 51C is provided to face the pusher 51B in order to hold the recording paper bundle from the opposite side when the recording paper is pierced into the recording paper bundle.
[0026]
The stapler main body 51 </ b> A is fixed to the back side of the post-processing tray 3 above the portion where the recess 33 of the post-processing tray 3 is formed. The pusher 51B is attached to the stapler body 51A so as to be rotatable in the direction of the clincher 51C. On the other hand, the clincher 51C is fixed to the front end side of the support member 52 that rotates toward the post-processing tray 3, and is separate from the stapler main body 51A and the pusher 51B.
[0027]
As described above, the post-processing tray 3 is formed in a convex shape in which a portion where the recess 33 is formed protrudes. For this reason, the pusher 51B provided in the recess 33 can be partially moved to a position protruding from the surface of the recess 33 of the post-processing tray 3 during the stapling operation. At the same time, the saddle stitching process can be performed.
[0028]
The center folding processing device 6 performs a center folding process on the central portion of the recording paper bundle that has been subjected to the saddle stitching, with respect to the recording paper bundle that has been subjected to the binding processing at the central portion by the saddle stitching processing device 5. As shown in FIG. 4, the middle folding processing device 6 of this embodiment includes a pair of middle folding rollers 61A and 61B that are in contact with each other, a rotation mechanism 62 provided on the middle folding rollers 61A and 61B, and a middle folding roller. A thin plate-like half-folded plate 63 provided to be able to advance and retreat toward the nip portion between 61A and 61B, that is, perpendicular to the recording paper bundle conveying direction and perpendicular to the post-processing tray 3. The center folding plate 63 is generally composed of an advance / retreat mechanism 64 for advancing / retreating.
[0029]
One of the pair of middle folding rollers 61A and 61B is pressed against the other middle folding roller by a pressure spring 60 shown in FIG. 4 and is always in contact with each other. It is forcibly rotated in the opposite direction.
[0030]
As shown in the figure, the rotation mechanism 62 includes a drive motor 62A, a drive gear 62C that rotates when the driving force of the drive motor 62A is transmitted via a belt 62B, and a driven gear that meshes and rotates with the drive gear 62C. The gear 62D and a transmission gear train 62E that transmits the rotational force from the driven gear 62D and rotates the two middle folding rollers 61A and 61B at the same peripheral speed.
[0031]
The drive gear 62C is rotatably attached to a housing or the like (not shown) with a rotation shaft serving as a rotation center. The driven gear 62D is also rotatably attached to the same housing (not shown) with a rotation shaft serving as a rotation center. As shown in FIG. 7, the four gears 62F to 62I constituting the transmission gear train 62E are connected to the three arms 62J to 62L, respectively, and the distance between the gear shafts is maintained constant. It is configured to be movable. Thus, even if the recording paper bundle P is sandwiched between the folding rollers 61A and 61B and the both folding rollers 61A and 61B are separated, the rotational force can be reliably transmitted to both the folding rollers 61A and 61B. It has become.
[0032]
In FIG. 4, the half-folded plate 63 is provided with three substantially rectangular projecting parts 631A to 631C in a symmetrical manner at the front end portion that presses against the recording paper bundle, and these projecting parts 631A to 631C are recorded. It abuts against a bundle of paper and presses it. These protrusions 631A to 631C are formed in a shape in which the thickness of the tip is made as thin as possible. Of the protrusions 631A to 631C, the protrusions 631A and 631C on the left and right ends are, as shown in FIG. 5, two binding needles driven into the recording paper bundle P by the saddle stitching processing device. The recording paper bundle P is pushed in such a state that it is in contact with or in contact with the binding needle N during the middle folding operation.
[0033]
Further, the remaining protrusion 631B is provided at an intermediate position between the protrusions 631A and 631C on both sides, and presses the central position of the recording paper bundle. In the case of performing the folding operation by the folding plate 63, these projecting portions 631A to 631C press the recording paper and reach the nip portions of the folding rollers 61A and 61B as shown in FIG. It has come to move forward.
[0034]
Further, as shown in FIG. 4, slide shafts 63A and 63B are provided on both sides of the center folding plate 63 so as to project from the center folding plate 63 in the left-right width direction. It protrudes longer than the shaft 63B. The slide shafts 63A and 63B are guided in their forward / backward movement by a guide member 63C fixed in a fixed state to a housing (not shown).
[0035]
As shown in FIGS. 4 and 7, the advance / retreat mechanism 64 includes a drive motor 64A, an output gear 64B rotated by the drive motor 64A, an intermediate gear 64C meshed with the output gear 64B, and meshed with the intermediate gear 64C. The driven gear 64D and the rotation link 64E are configured.
[0036]
A rotating shaft 641C serving as a rotation center is rotatably attached to the intermediate gear 64C, such as a housing (not shown). A rotation shaft 642D serving as a rotation center is also rotatably attached to the same housing (not shown) or the like in the driven gear 64D. The driven gear 64D has a larger diameter and has a larger number of teeth than the intermediate gear 64C, and a spoke portion 643D is attached between the rotating shaft and the outer peripheral surface of the driven gear 64D. Further, an engagement protrusion 644D is formed on the spoke portion 643D of the driven gear 64C.
[0037]
As shown in FIGS. 4 and 7, the rotation link 64E is provided with engagement holes 645E and 646E in the intermediate portion and the tip portion, respectively, and the engagement protrusions 645E and 646E have engagement protrusions. 644D and slide shaft 63A are slidably inserted and engaged, respectively. Further, the rotation link 64E has a base end attached to the rotation shaft 641C of the intermediate gear 64C in a rotation free state, and an engagement protrusion of a spoke portion 643D that moves in accordance with the rotation operation of the driven gear 64D. With the moving operation of 644D, the head is swung at a predetermined angular velocity ω (rad) around the base end.
[0038]
The slide shaft 63A reciprocates while following the rotation link 64E at a position separated from the rotation center 641C of the rotation link 64E by a distance r.
[0039]
Next, the operation of this embodiment will be described.
(1) In FIG. 1, when the image is transferred by the copying machine 2 and the post-processing is not performed on the recording paper discharged from the copying machine 2, the non-processing mode is selected and set. Then, it is conveyed along the non-processing conveyance path α as it is by the sorting action of the separation claw 13, and is discharged toward the tray 1A outside the recording paper post-processing apparatus 1 by the paper discharge roller 12D.
[0040]
(2) Further, for example, when the end face binding processing mode is selected / set, a solenoid (not shown) is operated to rotate the separation claw 13 so that each recording sheet is sequentially conveyed toward the post-processing conveyance path β. . In this way, a predetermined plurality of sheets (for example, a maximum of about 50 sheets) of recording paper are stacked on the post-processing tray 3. The recording paper alignment operation is performed prior to the end-face binding operation in the post-processing tray 3. Is called.
[0041]
That is, the direction of conveyance of each of these recording sheets is reversed by approximately 180 degrees so that the leading end side is obliquely upward in the vicinity of the end portion of the post-processing conveyance path β. Each recording sheet bundle P conveyed here is struck in the direction of the rear end reference fence 31 by the cooperative action of the rotating operation of the brush roller 12H and the tapping roller 12I movable in the direction of the post-processing tray 3. It falls below the post-processing tray 1.
[0042]
As a result, when the rear end of the recording paper bundle P reaches the rear end reference fence 31 of the post-processing tray 3, the jogger fence drive motor 32A is driven, and the jogger fence 32 moves in the X direction (see FIG. 2) for recording. The both ends of the paper bundle are pressed to align the recording paper bundle in the center in the transport direction.
[0043]
Such a series of alignment operations are performed on the plurality of recording paper bundles P discharged from the copying machine 2, and thereafter, the operation shifts to an end face binding operation. When the recording paper bundle P is discharged to the post-processing tray 3, the eccentric cam 53 shown in FIG. 3 is on standby in a predetermined standby state. Further, the saddle stitch clincher 51C is retracted to the position farthest from the pusher 51B.
[0044]
The recording sheet bundle P stacked and aligned on the post-processing tray 3 in this way is subjected to binding processing at a predetermined position by the end-face binding stapler, and along the post-processing tray 3 by a discharge claw not shown. It is lifted upward and discharged to the tray 1A by the discharge roller 12D shown in FIG.
[0045]
(3) Also, for example, when the saddle stitching processing mode is selected / set, the desired plural number of the clincher 51C remains in the position farthest from the pusher 51B in the same manner as in the end face processing mode described above. The recording paper bundle P is aligned and stacked on the post-processing tray 3.
[0046]
Thereafter, as shown in FIG. 3, the clincher 51 </ b> C is pushed out toward the stapler main body 51 </ b> A by the rotational operation of the eccentric cam 53, and moves forward to stop when it comes closest to the recess 33. Here, the pusher 51B of the stapler unit 51 is pushed forward by a pressing means (not shown) to move forward, thereby causing the central portion of the recording paper bundle P in the width direction (X direction in FIG. 2) along the half-folded portion. Only two places are stapled and saddle stitching is performed.
[0047]
When this saddle stitching process is completed, the eccentric cam 53 rotates again, and the clincher 51C returns to the original home position again and waits. If the recording paper to be used is other than, for example, A3 size (B4, A4 size, etc.), immediately after the recording paper bundle P is stacked in an aligned state, the discharge claw moves according to each recording paper size, and recording is performed. The rear end of the sheet bundle P is lifted upward, and the movement operation is stopped when the central portion of the recording sheet bundle P reaches the binding position. Thereafter, the series of saddle stitching operations described above are performed.
[0048]
The recording paper bundle that is saddle-stitched in this way is further lifted upward of the post-processing tray 3 by the movement of the discharge claw, and a folded portion of the recording paper bundle P (hereinafter referred to as a middle folding line). Called to stop when P0 reaches a position that coincides with the direction in which the folding plate 63 moves forward. The moving / lifting distance of the recording paper bundle here is uniquely determined by the positional relationship between the half-folding processing device 6 and the saddle stitching processing device 5, and is therefore constant regardless of the recording paper size.
[0049]
Thereafter, the folding plate 63 and the folding rollers 61A and 61B start to operate. As a result, the half-fold plate 63 moves forward toward the recording paper bundle P and the nip portions of the half-fold rollers 61A and 61B. That is, the protrusions 631A to 631C of the half-folded plate 63 move forward in a substantially vertical direction with respect to the front side of the post-processing tray 3, and on the middle folding line P0 of the recording paper bundle P, as shown in FIG. The protrusions 631A and 631C press and advance toward the nip portion while abutting the binding needle N, respectively.
[0050]
On the other hand, the projection 631B provided at the center of the front end of the center folding plate 63 is in contact with the middle folding line P0 of the recording paper bundle P, and presses and advances toward the nip portion. In this way, the middle folding line P0 of the recording paper bundle P is pressed so as to be pushed into the nip portions of the middle folding rollers 61A and 61B.
[0051]
By the pressing / advancing operation of the center folding plate 63, the recording sheet bundle P is closely attached and pressed between the center portion P0 and the center folding rollers 61A, 61B, but this rotates in the opposite direction at the same peripheral speed. The recording paper bundle P is firmly bent at the middle folding line P0 by the pressing operation and the rotating operation of the middle folding rollers 61A and 61B.
[0052]
When this folding operation is performed, the folding angle of the recording paper bundle is equal to the thickness of the middle folding plate 63 in the vicinity of the middle folding line P0 of the recording paper bundle contacting the protrusions 631A to 631C of the middle folding plate 63. Can not be secured large, so the bending power will be sweetened accordingly. However, since the area where the bending force is weakened is only a limited part of the three areas where the protrusions 631A to 631C have entered, the middle folding rollers 61A and 61B are used for most of the remaining areas. The bending force due to the above acts sufficiently, so that the folding can be surely performed as compared with the conventional one in which a half-fold plate is inserted and pressed into the entire width of the recording paper bundle.
[0053]
In addition, among the three areas of the recording paper bundle into which the protrusions 631A to 631C of the center folding plate 63 enter, the binding needle N is driven by the saddle stitching processing device 5 into the area where the left and right protrusions 631A and 631C enter. It is a part that. Therefore, since the bending force by the intermediate folding rollers 61A and 61B was originally difficult to act, for example, whether the thickness of the protruding portion is set to the same level as the thickness of the binding needle when it is driven If it is formed to a thickness close to that, the effect of being pushed in by the protrusions 631A and 631C can be almost ignored. That is, if the left and right protrusions 631A and 631C are provided at such positions, it is possible to minimize the decrease in the bending force by the middle folding rollers 61A and 61B.
[0054]
Further, among the protrusions 631A to 631C, the remaining one protrusion 631B is in contact with the middle folding line P0 of the recording paper bundle P, so that the recording paper bundle P is in contact with the recording paper bundle P. Thus, it is possible not only to prevent the pressing force from acting on one of the left and right sides, but also to prevent the following bending failure.
[0055]
That is, for example, as shown in FIG. 9, in the case where the protrusions are provided only at the two left and right portions of the folding plate 63, there is no protrusion for pushing the central portion of the recording paper bundle P. The bending defect which produces the bulging part B, bending, etc. in the center part has generate | occur | produced. However, since the three protrusions 631A to 631 as shown in this example are symmetrically provided, the middle protrusion 631B can abut against and press the central portion of the recording paper bundle, so that the recording paper can be pressed. It is possible to prevent a bending failure at the center of the bundle.
[0056]
In addition, by providing the three folded portions 631A to 631C on the middle folded plate 63, the contact region of the middle folded plate 63 with the recording paper bundle is only the three projected portions 631A to 631C. When the sheet is advanced to the nip portion, when the folding plate 63 retreats from the pressure nipping state between the pressure rollers 61A and 61B and the recording sheet bundle, the recording sheet that comes in contact is pulled back in the opposite direction by the friction force. The force to be applied is smaller than that of the conventional one in which the folding plate contacts the entire width of the recording paper bundle. Further, the motor 64A for driving the folding plate 63 to move backward also requires a small load during driving.
[0057]
In particular, of the three protrusions 631A to 631C as in this example, the left and right protrusions 631A and 631C are made to coincide with the driving position of the binding needle N of the recording paper bundle as shown in FIG. In the two protrusions 631A and 631C, when the folding plate 63 is moved backward, the binding needle provided at the corresponding position on the recording paper side records together with the protrusions 631A to 631C. It also prevents the paper from being dragged back.
[0058]
As a result, the recording paper bundle P is reliably folded by the half-folding rollers 61A and 61B, and is folded in half. The half-folding rollers 61A and 61B pass the sandwiched recording sheet bundle P as it is and discharge it toward the tray 1A (see FIG. 1).
[0059]
In this way, a booklet in which a plurality of recording papers are bundled together can be bound in a good state without causing wrinkles, bulges, or tears during folding.
[0060]
Therefore, according to this embodiment, there is no trouble that the inner recording sheet is pulled together with the center folding plate 63 and is pulled back from the binding needle.
[0061]
In this embodiment, the end face binding process, the saddle stitching process, and the middle folding process are configured to share the post-processing tray and the conveyance path, and accordingly, a larger mechanism or device is required. Therefore, various types of binding processes can be performed without increasing the size, and it is possible to realize a small-sized and high-performance apparatus at a low cost.
[0062]
【The invention's effect】
As described above, according to the present invention, a plurality of protrusions are provided at the front end of the folded sheet, and when the folded sheet advances toward the nip portion of the folded sheet roller, only the projected part is the recording paper. Since the part that advances to the nip part is limited to the protruding part that partially protrudes from the front end part of the folded plate instead of extending over the entire width of the folded sheet. In the region other than the protruding portion where the protruding portion is not bitten, the bending force for bending the recording paper bundle is not reduced. As a result, the folding force to fold the recording paper bundle is increased compared to the conventional type in which the front end of the folding plate is sandwiched between the nips over the entire width, so that a reliable folding process can be performed with a large folding force. Therefore, a recording paper post-processing apparatus with high reliability can be realized.
[0063]
In addition, according to the present invention, since a simple structure of providing a plurality of protrusions at the front end of the half-folded plate is sufficient, an effect of being manufactured at a low cost can be obtained.
[0064]
further, this According to the invention, the protruding portion of the half-folded plate is provided at a position where it comes into contact with the binding needle driven into the recording paper bundle by the saddle stitching processing apparatus, and the protruding portion of the half-folded plate normally contacts. There is a possibility that the pushing force of the protruding portion acts on the recording paper bundle portion and the pushing mark remains, but the protruding portion is pressed against a binding needle formed of metal such as iron. Therefore, in the recording paper bundle, at least at the portion that is in contact with the binding needle, the pushing trace of the protruding portion becomes inconspicuous, and accordingly, it is possible to perform the half-folding process with good appearance, and to improve the quality.
[0065]
In addition, at the part where the binding needle of the recording paper bundle was originally hit, the folding of the recording paper bundle is sweetened by the thickness of the binding needle, but the protruding portion of the half-folded plate where the folding becomes sweet by entering the nip part By matching the position where the binding needle is struck, it becomes possible to minimize the portion where the folding becomes sweet, so that it is possible to realize a more reliable middle folding process.
[0066]
And claims 2 According to the invention according to the present invention, the protruding portion at the front end of the folded plate is provided symmetrically with respect to the center position, and it can be prevented from being biased to be biased to either the left or right to cause a bending failure. In addition, it is possible to perform the middle folding process, and it is possible to realize a process with higher reliability.
[0067]
And claims 3 According to the invention, there are three protrusions at the front end of the middle folded plate symmetrically with respect to the center position of the middle folded plate. For example, when there are two projecting portions left and right symmetrically, the recording paper When these protrusions abut against the bundle and press to be folded inward, the central portion of the recording paper bundle is not pressed, so that there is a risk of causing a bending failure in which the recording sheet is bent or swollen and not folded. Of the three protrusions, the protrusion at the center can reliably press the center position of the bundle of recording papers, and the center part can be folded in the middle, so that reliable and stable folding process can be performed. It is possible to provide a product with higher reliability.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a recording paper post-processing apparatus of an image forming apparatus according to the present invention.
FIG. 2 is a perspective view showing the internal structure of the main part.
FIG. 3 is an explanatory diagram showing a post-processing action of a recording sheet bundle in a subsequent processing tray.
FIG. 4 is a schematic perspective view showing the center folding apparatus.
FIG. 5 is an explanatory view showing the action of the folded plate.
FIG. 6 is an explanatory view showing a correlation position between the center folding plate and the center folding roller.
FIG. 7 is an explanatory diagram showing an advance / retreat operation of the half-fold processing apparatus.
FIG. 8 is an explanatory diagram showing the half-folding operation.
FIG. 9 is an explanatory diagram showing a bending failure that occurs during the middle folding operation.
[Explanation of symbols]
1 Recording paper bundle post-processing device
2 Image forming device
3 Post-processing tray (recording paper stack alignment tray)
4 End binding device
5 Saddle stitching processing device
6 Folding device
61A Folding roller
61B Folding roller
62 Rotating mechanism
63 Folded plate
631A Protrusion
631B Protrusion
631C Protrusion
64 Advance / Retreat Mechanism
B Swelling part
N binding needle
P Recording paper bundle
P0 center

Claims (3)

An image provided with a half-folding processing device having a blade-like middle folding plate that advances and retreats toward the middle folding portion of the recording paper bundle, and a middle folding roller that bites and folds the recording paper bundle pushed by the middle folding plate A recording paper bundle post-processing device of the forming device,
A plurality of protrusions are provided at the front end of the center folding plate, and when the center folding plate advances toward the nip portion of the center folding roller, only the protrusion is in contact with the recording paper bundle ,
A saddle stitching processing device for driving a staple with a stapler at the center of the recording paper is provided, and the protruding portion of the half-folded plate comes into contact with the binding needle driven into the recording paper bundle by the saddle stitching processing device. A recording paper post-processing apparatus of an image forming apparatus, wherein the recording paper post-processing apparatus is provided at various positions . 2. The recording paper post-processing apparatus of an image forming apparatus according to claim 1, wherein the protruding portion of the middle folded plate is provided symmetrically with respect to the center position of the middle folded plate. Projection of folding plates, the recording paper post-processing apparatus of the image forming apparatus according to claim 1, characterized in that it provided three symmetrically to the center position of the folding plate as a reference.

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