JP4673240B2 - Sheet member post-processing apparatus and image forming apparatus - Google Patents

Description

  The present invention provides a sheet member post-processing apparatus such as a finisher and a sorter, which is provided in an image forming apparatus such as a copying machine or a printer, and includes an aligning device that acts on an end portion of the sheet member to align the sheet member. The present invention relates to an image forming apparatus.

In a sheet member post-processing apparatus such as a finisher or a sorter provided in an image forming apparatus such as a copying machine or a printer, the sheet member binding process is performed by the binding unit, and the bound sheet member is placed on the stacking unit by the discharge unit. It is known to discharge (see, for example, Patent Documents 1 and 2).
JP 2004-182399 A JP 2004-244154 A

However, there is a problem that when the binding process is performed on the sheet member and the discharging operation is performed by the link or the like, the binding means and the discharging means collide when the binding means is on the discharging track of the discharging means.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sheet member post-processing device that avoids the binding means after the binding operation is completed and before the discharge operation is started, and an image forming apparatus equipped with the same, in consideration of the above-described situation. It is in.

In order to solve the above problems, the invention according to claim 1 is directed to a sheet member post-processing apparatus that receives a sheet member on which an image is formed from an image forming apparatus and performs post-processing on the sheet member. a receiving means for discharged onto the paper discharge stacking unit receives the sheet member discharged from the apparatus, and means returning the sheet member discharged on the paper discharge stacking unit on feeding the sheet member rear stop means, said An alignment unit that aligns the sheet member stacked on the sheet member trailing edge stopping unit in a direction orthogonal to the conveyance direction, and a unit that binds the sheet member aligned by the alignment unit, and is orthogonal to the sheet member conveyance direction. A stapler that is movable between the binding position and the retracted position, and a stapler that moves the stapler between the binding position and the retracted position. And La moving means, and a release means for releasing to the sheet discharge stacking means sheet member after stapling operation is completed from the sheet member rear stop means by the stapler, when performing the sheet material discharge operation by the discharge means The stapler moving means moves the stapler to the retracted position .

The invention described in 請 Motomeko 2, in the sheet member post-processing apparatus according to claim 1, after the sheet material discharge operation end by the release means, automatically stapling position before the stapler is moved to the retracted position and wherein a moving to Turkey.
According to a third aspect of the present invention, in the sheet member post-processing apparatus according to the first or second aspect, the stapler is moved to the retracted position when the binding position is on a trajectory of the discharge operation of the discharge means. It is characterized only by
The invention described in 請 Motomeko 4, in the sheet member post-processing apparatus according to claim 2, the retraction action of the stapler, stapling position by the stapler and performing in response to the end binding or two-spot binding .
The invention described in 請 Motomeko 5, the sheet member post-processing apparatus according to claim 4, wherein, when the binding position is in either of the two ends of the sheet members, wherein the said retracted position closer to the binding position and wherein the TURMERIC line the saving action of the stapler.

The invention described in 請 Motomeko 6, in the sheet member post-processing device according to any one of claims 1 to 5, wherein the stapler is that the stapler is stopped on release trajectory of said discharge means and wherein the Turkey of having a detecting means for detecting for.
The invention described in 請 Motomeko 7, the sheet member post-processing apparatus according to claim 6, wherein when the stapler is detected by the detecting means and the go, such perform the operation of said release means.
The invention described in 請 Motomeko 8, in the sheet member post-processing apparatus according to claim 6, wherein the release means checks said detection means when performing the discharge operation, the stapler is tested knowledge by the sensing means when being characterized rows Ukoto retraction action of the stapler.
請 Motomeko invention described in 9, characterized by an image forming apparatus having a sheet member post-processing device according to any one of claims 1 to 8.

  According to the present invention, when the sheet member is bound and the discharge operation is performed by the discharge link or the like, when the binding means is on the discharge track of the discharge means, the discharge operation is started after the binding operation is completed. After the binding means has been retracted and the sheet member has been released, the next sheet member is conveyed to the sheet member trailing edge stopping means by automatically moving the binding means to the position before the retraction. Even in the middle, the binding means can return to the binding position, and there is no need to provide an extra space between the sheets, and productivity is not lowered.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of the present invention. FIG. 2 is a schematic diagram showing a detailed configuration of the sheet member post-processing apparatus of FIG. First, the mechanism and basic control of the sheet member post-processing apparatus used in the present invention will be described.
With reference to FIGS. 1 and 2, a sheet member post-processing apparatus 2 is provided on one side of the image forming apparatus 1. As shown in FIG. 2, the sheet member post-processing apparatus 2 has an entrance roller 3 as a receiving unit, and a sheet member (not shown) discharged from the image forming apparatus 1 is placed in the sheet member post-processing apparatus 2. Thereafter, the sheet is discharged onto a sheet member stacking section 11 of a discharge tray 4 as a discharge stacking means or a jogger 6 as an alignment means, which will be described later.

The return roller 5 that is a return means is composed of a roller 5a that conveys the sheet member and an arm 5b that supports the roller 5a. The arm 5b has a center of rotation at the opposite end that does not support the roller 5a. The return roller 5 is transported in the direction of the rear end fence 7 by the forward rotation drive, and is transported in the direction of the paper discharge tray 4 when driven in the reverse direction.
The jogger 6 as the aligning means includes a vertical portion acting on the end surface of the sheet member and a stacking portion 11 for stacking the sheet member. Further, a front jogger that aligns the front side of the sheet member and a rear jogger that aligns the rear side of the sheet member are provided. The sheet member discharged onto the paper discharge tray 4 or the jogger 6 is conveyed by the return roller 5, and its end abuts against the rear end fence 7.
The stapler 8 as a binding means for binding the sheet member is installed in the vicinity of the rear end fence 7 as the sheet member rear end stopping means , and the binding process is performed near the end of the sheet member aligned with the rear end fence 7. I do. The discharge link 9 moves the sheet member loaded on the paper discharge tray 4 and the jogger 6 and abutted against the rear end fence 7 onto the paper discharge tray 4. In FIG. 2, reference numeral 12 denotes an inlet sensor.

FIG. 3 is a schematic diagram illustrating a first operation of the sheet member post-processing apparatus. FIG. 4 is a schematic diagram illustrating a second operation of the sheet member post-processing apparatus. FIG. 5 is a schematic diagram illustrating a third operation of the sheet member post-processing apparatus. FIG. 6 is a schematic diagram for explaining a fourth operation of the sheet member post-processing apparatus.
FIG. 3 shows a state in which the sheet member S discharged from the image forming apparatus 1 (FIG. 1) passes through the entrance roller 3 and is discharged onto the discharge tray 4 or the jogger 6. At this time, the return roller 5 is in a position retracted onto the paper discharge tray 4.
In FIG. 4, the roller 5a of the roller 5 is swung on the sheet member S discharged onto the paper discharge tray 4 or the jogger 6, and the roller 5a rotates to place the sheet member S on the rear end fence. Transport to 7.

In FIG. 5, after the sheet member S is abutted against the rear end fence 7 and the vertical alignment is performed, the return roller 5 rises again to the retracted position. Then, the jogger 6 waiting at a position away from the side surface of the sheet member S by a preset distance pushes the side surface of the sheet member S and performs horizontal alignment.
FIG. 6 shows a state in which the sheet member bundle is moved to the paper discharge tray 4 by the discharge link 9 after the operations of FIGS. When performing the binding process, the stapler 8 performs the binding, and similarly, the binding bundle is moved to the paper discharge tray 4 by the discharge link 9.
Thus, the sheet member S is stacked across the jogger 6 and the paper discharge tray 4 regardless of the binding mode or the non-binding mode. The jogger 6 serves not only for the horizontal alignment operation of the sheet members S but also for the sheet stacking function.
The swinging motion of the return roller 5 is a solenoid and a motor, the alignment operation of the jogger 6 is a motor, the roller 5a of the return roller 5 and the entrance roller 3 are motors, the discharge link 9 is a motor, etc. The details are omitted.

FIG. 7 is a flowchart for explaining the operation when the sheet member is conveyed to the stacking unit for stapling and stacked. FIG. 8 is a flowchart for explaining the operation during stapling.
With reference to FIG.2 and FIG.7, the operation | movement at the time of loading is demonstrated. First, it is determined whether the inlet sensor 12 is on (S1). If it is on, the driving of the transport motor (not shown) is started (S2). Next, it is determined whether or not the inlet sensor 12 is off (S3). If it is off, it is determined whether or not the transport motor is driven with a designated pulse (S4), and a return roller solenoid (not shown) is turned on. It is turned on and a return roller motor (not shown) is driven (S5).

Next, it is determined whether or not the return roller motor is driven by the designated pulse (S6). If it is driven by the designated pulse, the return roller solenoid is turned off and the return roller motor is stopped (S7).
Subsequently, a jogger motor (not shown) is driven to rotate forward with a designated pulse (S8), and it is determined whether or not the jogger motor is stopped (S9). If the jogger motor is stopped, the jogger motor is reversely driven with a designated pulse (S10), it is determined whether the jogger motor is stopped (S11), and if the jogger motor is stopped, the process is terminated.

Next, the operation at the time of stapling will be described with reference to FIG. 2 and FIG. 8. Since the operation is the same from step S9 in the flowchart of FIG. 7, the description from step S1 to step S9 is omitted.
If the jogger motor is stopped in step S9, stapling is started (S12). Further, it is determined whether or not the jogger motor is stopped (S13). If the jogger motor is stopped, the jogger motor is reversely driven with a designated pulse (S14).
Next, it is determined whether the jogger motor is stopped (S15). If the jogger motor is stopped, the discharge link motor (not shown) is driven (S16), and it is determined whether the discharge link motor is stopped (S17). If the discharge link motor is stopped, the process ends.

FIG. 9 is a schematic view showing the positional relationship between the stapler and the discharge link. FIG. 10 is a schematic view showing the trajectory of the discharge operation of the discharge link and the trajectory of the stapler movement. FIG. 11 is a schematic view showing a collision between the stapler and the discharge link. FIG. 12 is a schematic view showing the retraction of the stapler during the discharge link operation.
9 to 12, the motor 17 side with the pulley 16 having the stapler discharge HP (home position) sensor 18 is the front side. When the pulley-equipped motor 17 is driven forward, the stapler 8 moves to the back side, and when driven reversely, the stapler 8 moves to the front side.
In FIG. 9, reference numeral 4 denotes a paper discharge tray, 9 denotes a discharge link, 12 denotes a guide rod for guiding the stapler 8, and 15 denotes a timing belt wound around the pulley 16 on both sides.

  As shown in FIG. 10, there is a point (collision point) where the trajectory of the ejection operation of the ejection link 9 and the trajectory of movement of the stapler 8 intersect. Therefore, as shown in FIG. 11, when the discharge link 9 is operated when the point (collision point) where the trajectory of the movement of the stapler 8 intersects the trajectory of the discharge operation of the discharge link 9 is at that position, the stapler is moved. 8 will collide. Accordingly, as shown in FIG. 12, when the discharge link 9 is operated, the stapler 8 is moved to the retracted position, here, the motor 17 with pulley.

FIG. 13 is a flowchart for explaining the control when the stapler is moved to the retracted position during the release link operation. Referring to FIGS. 12 and 13, first, it is determined whether or not there is a request for a stapler discharge operation (S21). If there is a request for releasing the stapler, reverse rotation driving of the stapler moving motor (motor with pulley) 17 is started (S22).
It is determined whether the stapler discharge HP sensor 18 is on (S23). If the stapler discharge HP sensor 18 is on, the stapler moving motor is stopped, and the drive of the discharge link drive motor (not shown) is started (S24). Next, it is determined whether or not the discharge operation is completed (S25). If completed, the discharge link drive motor is stopped (S26).
The number of pulses of the stapler moving motor 17 that drives the movement of the stapler 8 when the stapler 8 moves from the binding position to the retracted position is A pulse. In this case, when returning from the retracted position to the binding position again, the stapler 8 is moved to the exact same position as the position before retracting by driving the pulse motor that drives the movement of the stapler 8 reversely by A pulses. Can do.

FIG. 14 is a flowchart for explaining the control during movement of the stapler to the position before retraction. Referring to FIG. 12 and FIG. 14, first, it is determined whether or not there is a request for releasing the stapled sheet member bundle (S31).
If there is a request for releasing the stapled sheet member bundle, the stapler moving motor 17 starts to rotate in reverse and starts counting pulses (S32).
It is determined whether the stapler discharge HP sensor 18 is on (S33). If the stapler discharge HP sensor 18 is on, the stapler moving motor is stopped, the pulse count is terminated, and the drive of the discharge link drive motor (not shown) is started (S34).

Next, it is determined whether or not the discharge operation is completed (S35). If the discharge operation is completed, the discharge link drive motor is stopped, and the stapler moving motor starts normal rotation drive for the counted number of pulses (S36). Thereafter, it is determined whether or not the stapler moving motor is stopped (S37).
After the binding means (stapler) 8 is retracted and the sheet member is discharged, the sheet member is automatically moved to the position before the retracting, whereby the next sheet member is the sheet member rear end stop means (the rear end fence 7 in FIG. 2). ) Even during conveyance, the stapler 8 can be returned to the binding position, and it is not necessary to leave an extra space between the sheets, so that productivity is not lowered.

FIG. 15 is a schematic view showing the position of the stapler in the case of A4Y edge binding. FIG. 16 is a schematic diagram showing the position of the stapler in the case of B5T end binding. As shown in FIGS. 15 and 16, the position of the stapler 8 changes depending on the position where the stapler is performed.
For example, as shown in FIG. 15, in the case of A4Y end binding, the stapler 8 does not stop on the discharge trajectory of the discharge link 9, so there is no need to perform a retreat action. However, as shown in FIG. 16, in the case of B5T end binding, the stapler 8 is stopped on the discharge path of the discharge link 9, so that it is necessary to perform a retreat action.
As described above, the stapler 8 may or may not need to perform the retreat action depending on the size of the sheet member bundle to be stapled. When performing the discharge operation, it is determined whether or not the stapler 8 is retracted from the size of the seed member bundle.

FIG. 17 is a flowchart for explaining the control operation in determining whether or not to perform the retracting action of the stapler. Referring to FIG. 15, FIG. 16, and FIG. 17, it is first determined whether or not there is a request for releasing the stapled sheet member bundle (S41). If there is a discharge operation request for the stapled sheet member bundle, it is determined whether the size of the stapler 9 needs to be avoided (S42).
If the size of the stapler 8 is such that the avoidance operation is necessary, the reverse drive of the stapler moving motor 17 is started, and the counting of the number of pulses is started (S43). Next, it is determined whether or not the stapler discharge HP sensor 18 is on (S44).
If the stapler discharge HP sensor 18 is on, the stapler moving motor 17 is stopped, the pulse count is finished (S45), and the drive of the discharge link drive motor (not shown) is started (S46).

Next, it is determined whether or not the discharge operation is completed (S47). If the discharge operation is completed, the discharge link drive motor is stopped, and the stapler moving motor starts normal rotation drive for the counted number of pulses (S48). Thereafter, it is determined whether or not the stapler moving motor is stopped (S49).
The stapler 8 serving as the binding means has its stop position determined by the size of the sheet member that performs the binding operation, and performs the retreat action only when the stop position is on the discharge operation path of the discharge link 9 as the discharge means. By not performing the retreat action, wasteful use of power due to movement of the stapler 8 is prevented.

FIG. 18 is a schematic view showing the position of the stapler in the case of A4Y edge binding. FIG. 19 is a schematic diagram showing the position of the stapler in the case of A4Y two-point binding. Referring to FIGS. 18 and 19, the position of the stapler 8 varies depending on the position at which stapling is performed.
For example, as shown in FIG. 18, in the case of A4Y end binding, the stapler 8 does not stop on the discharge trajectory of the discharge link 9, so that it is not necessary to perform a retreat action. However, as shown in FIG. 19, in the case of two-point binding of A4Y, the stapler 8 is stopped on the discharge track of the discharge link 9, so that it is necessary to perform a retreat action.
As described above, the stapler 8 may or may not need to be retracted depending on the binding type of the sheet member bundle to be stapled. When performing the discharge operation, it is determined whether or not to perform the retracting action of the stapler 8 based on the binding type in which stapling is performed. Control of the retracting action of the stapler 8 from this binding type is performed in the same manner as in the flowchart of FIG.

As described above, the stapler 8 determines the stop position depending on the type of the binding operation, performs the retreat action only for the binding type whose stop position is on the path of the discharge operation of the discharge link 9, and does not perform the retreat action for the other binding types. As a result, wasteful use of power due to movement of the stapler 8 is prevented.
A B5T sheet member bundle will be described as an example. In the case of front end binding, the front side is retracted (FIG. 18), and in the case of rear end binding, the stapler 8 is retracted to the rear side (FIG. 19).
The stapler 8 determines the stop position by the type of binding operation, that is, end binding or two-point binding, and shortens the retreat time by performing the retreat action at the shortest distance from the trajectory of the discharge operation of the discharge link 9. Can do.

FIG. 20 is a schematic view showing a detection plate and a detection sensor on the bottom side of the stapler. As shown in FIG. 20, the detection plate 19 is attached to the bottom side of the stapler 8, and the first detection sensor 20 and the second detection sensor 21 are positioned so as to be turned on when the stapler 8 is on the discharge track of the discharge link 9. Is installed.
The stapler 8 is detected when the first detection sensor 20 and the second detection sensor 21 are on, and is not detected when the sensors 20 and 21 are off. When the discharge link 9 is operated during the initial operation, it is possible to check whether the stapler 8 exists on the track.

FIG. 21 is a flowchart for explaining the control of the stapler and the discharge link at the time of initialization. Referring to FIG. 20 and FIG. 21, first, it is determined whether or not there is an initial request (S51). If there is an initial request, it is determined whether or not the first detection sensor 20 is off (S52). Subsequently, it is determined whether or not the second detection sensor 21 is off (S53).
If the 2nd detection sensor 21 is OFF, the drive of a discharge link drive motor (not shown) will be started (S54). Next, it is determined whether or not the discharge link HP sensor (not shown) is on (S55). If it is on, the drive of the discharge link drive motor is stopped (S56).
Next, it is determined whether or not the stapler HP (home position) sensor 18 is off (S57). If it is off, the reverse rotation driving of the stapler moving motor 17 is started (S58). Subsequently, it is determined whether or not the stapler HP sensor 18 is on (S59). If the stapler HP sensor 18 is on, the stapler moving motor is stopped (S60) and the process ends.

If the first and second detection sensors 20, 21 are not turned off in the above steps S52, S53, reverse rotation driving of the stapler moving motor is started (S61), and it is determined whether the stapler HP sensor 18 is turned on (S62). The stapler moving motor is stopped and the driving of the discharge link driving motor is started (S63). Thereafter, it is determined whether or not the discharge link HP sensor is on (S64). If it is on, the drive of the discharge link drive motor is stopped (S65).
When the detecting means 20 and 21 for detecting that the stapler 8 is stopped on the discharge track of the discharge link 9 is detecting the stapler 8, the discharge link 9 collides with the stapler 8 when performing the discharge operation. . By prohibiting the operation of the discharge link 9 when the detecting means 20 and 21 are detecting the stapler 8, the above-mentioned problem can be prevented.
Further, when the discharge link 9 is operated during the discharge operation, it is checked whether the stapler 8 exists on the track, and if it exists, the discharge operation is performed after the stapler 8 is retracted.

FIG. 22 is a flowchart for explaining the control for operating the discharge link after the stapler is retracted. Referring to FIGS. 20 and 22, first, it is determined whether or not the stapled sheet member bundle is discharged (S71). If the discharged operation is present, it is determined whether or not the first detection sensor 20 is on ( If it is ON, the flag A is turned ON (S73).
Next, reverse rotation driving of the stapler moving motor (motor with pulley) 17 is started, and pulse count is started (S74). It is determined whether or not the stapler moving motor is stopped (S75), and driving of the discharge link driving motor (not shown) is started (S76). Next, it is determined whether or not the discharge operation is completed (S77). If completed, the discharge link drive motor is stopped (S78).
If the first detection sensor 20 is not on in step S72, it is determined whether the second detection sensor 21 is on (S79) and the flag B is turned on (S80). Next, the forward drive of the stapler moving motor is started, and the pulse count is started (S81). It is determined whether or not the stapler moving motor is stopped (S82). If it is stopped, the process proceeds to step S76.

Following step S78, it is determined whether or not the flag A is on (S83). If it is on, normal rotation driving is started for the counted number of pulses (S84), and it is determined whether or not the stapler moving motor is stopped (S85). ) If it is stopped, it is terminated.
If the flag A is not on, it is determined that the flag B is on (S86), reverse rotation driving of the stapler moving motor is started by the counted number of pulses (S87), and the process proceeds to step S85.
When the discharge link 9 performs the discharge operation, the detection means 20 and 21 are checked to determine whether the discharge operation is possible, thereby preventing the stapler 8 and the discharge link 9 from colliding.
Furthermore, by retracting the sheet member to a position where the pressing operation is not performed when the sheet member is returned by the return roller 5, the sheet member rear end stops against the sheet member rear end member instead of the sheet rear end pressing member, Jam can be prevented.

It is the schematic which shows the structure of this invention. It is the schematic which shows the detailed structure of the sheet | seat member post-processing apparatus of FIG. It is the schematic explaining the 1st operation | movement of a sheet | seat member post-processing apparatus. It is the schematic explaining the 2nd operation | movement of a sheet | seat member post-processing apparatus. It is the schematic explaining the 3rd operation | movement of a sheet | seat member post-processing apparatus. It is the schematic explaining the 4th operation | movement of a sheet | seat member post-processing apparatus. 10 is a flowchart illustrating an operation when a sheet member is conveyed to a stacking unit for stapling and stacked. It is a flowchart explaining the operation | movement at the time of a staple. It is the schematic which shows the positional relationship of a stapler and a discharge | release link. It is the schematic which shows the track | orbit of discharge | emission operation | movement of a discharge | release link, and the movement track | orbit of a stapler. It is the schematic which shows the collision of a stapler and discharge | release link. It is the schematic which shows retraction | saving of a stapler at the time of discharge | release link operation | movement. It is a flowchart explaining the control at the time of moving a stapler to a retracted position at the time of discharge link operation. It is a flowchart explaining the control at the time of movement of the stapler to the position before retraction. It is the schematic which shows the position of the stapler in the case of A4Y edge binding. It is the schematic which shows the position of the stapler in the case of B5T end binding. It is a flowchart explaining the control operation | movement in determination of whether to perform the retracting action of a stapler. It is the schematic which shows the position of the stapler in the case of A4Y edge binding. It is the schematic which shows the position of the stapler in the case of A4Y two-point binding. It is the schematic which shows the detection plate and detection sensor of the bottom side of a stapler. It is a flowchart explaining control of the stapler and discharge link at the time of initial. It is a flowchart explaining the control which operates a discharge | release link after retracting a stapler.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Image forming apparatus, 2 sheet member post-processing apparatus, 3 receiving means (entrance roller), 4 discharge stacking means (discharge tray), 5 return means (return roller), 5a roller, 5b arm, 6 alignment means (jogger) ), 7 sheet member rear end stop means (rear end fence), 8 binding means (stapler), 9 discharge means (release link), 11 jogger sheet member stacking section, 17 stapler moving motor (motor with pulley), 18 stapler Release HP (home position sensor), 19 detection plate, 20 detection means (first detection sensor), 21 detection means (second detection sensor), S sheet member

Claims (9)

In a sheet member post-processing apparatus that receives a sheet member on which an image is formed from an image forming apparatus and performs post-processing on the sheet member,
A receiving unit that receives the sheet member discharged from the image forming apparatus and discharges the sheet member onto a discharge stacking unit;
A return means for feeding the sheet member discharged onto the discharge stacking means to a sheet member rear end stop means;
Aligning means for aligning the sheet members stacked on the sheet member rear end stop means in a direction perpendicular to the conveying direction;
A stapler for binding the sheet members aligned by the alignment means, and a stapler movable between the binding position and the retracted position in a direction perpendicular to the sheet member conveyance direction;
A stapler moving means for moving the stapler between a binding position and a retracted position;
And a release means for releasing to the paper discharge stacking unit from said seat member rear stop means of the sheet member after stapling operation is completed by the stapler,
An apparatus for post-processing a sheet member, wherein the stapler is moved to the retracted position by the stapler moving unit when the sheet member is released by the discharging unit . 2. The sheet member post-processing apparatus according to claim 1, wherein the stapler automatically moves to a binding position before moving to the retracted position after completion of the sheet member releasing operation by the releasing unit . The movement to the retracted position of the stapler, the binding position is the sheet member post-processing apparatus according to claim 1 or 2, wherein the performing only when located on the trajectory of the release operation of the release means. The retracting action of the stapler, the sheet member post-processing apparatus according to claim 2, wherein the stapling position by the stapler and performing in response to the end binding or two-spot binding. 5. The sheet member post-processing apparatus according to claim 4 , wherein when the binding position is at either one of both ends of the sheet member, the stapler is retracted to the retracted position closer to the binding position . The stapler, the sheet member post-processing device according to any one of claims 1 to 5, characterized in that it has a detection means for detecting that the stapler is stopped on release trajectory of said discharge means. 7. The sheet member post-processing apparatus according to claim 6, wherein when the stapler is detected by the detection unit, the operation of the discharge unit is not performed. Said discharge means checks said detection means when performing the discharge operation, the stapler when being examined knowledge by the detection means, according to claim 6, characterized in that the retracting action of the stapler Sheet member post-processing device.   An image forming apparatus comprising the sheet member post-processing apparatus according to claim 1.

Images