JPH09208116A - Paper sheet after-processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper sheet after-processing device capable of changing the binding angle of paper sheets on the front side and the innermost side with a simple structure. SOLUTION: A paper sheet after-processing device has a structure for receiving and joggling paper sheets discharged from a paper sheet discharging part of an image forming device and on which images are formed and for stapling the specified number of paper sheets. It is provided with a stepping motor 54 capable of changing the binding angle of a stapler 13, and a sensor 55 for detecting the angle position of the stapler 13 in changing of the binding angle, and the rotational direction in the operation of the stepping motor 54 for changing the biding angle on the basis of the signal detected from the sensor 55 is previously determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet post-processing apparatus connected to a copying machine, a printer, a facsimile, a printing machine or the like, and more particularly to a sheet post-processing apparatus characterized by stapler movement control.

[0002]

2. Description of the Related Art Various sheet post-processing apparatuses have been proposed for receiving and aligning image-formed sheets discharged from a sheet discharge section of an image forming apparatus, and stapling (stitching) a predetermined number of sheets (for example, Japanese Patent Laid-Open Publication No. 2000-242242). 62-269852, JP-A-4-47990, JP-A-4-113896, and many others).

[0003]

However, the stapler of the conventional sheet post-processing apparatus is moved along the end face according to the sheet size, and the angle is changed by the binding angle changing means on the front side and the back side of the sheet. However, since the mechanism is not a mechanism for binding sheets, and only one side of the sheet is bound at a position parallel to the end face of the sheet, there is a drawback that it cannot meet various needs.

A first object of the present invention is to have an angle changing means for changing the binding angle on the front side and the back side of the paper, and the direction in which the motor for changing the angle rotates is predetermined according to the detection result of the detecting means. Thus, a mechanism for returning the stapler to the home position once and then moving it to a predetermined position by providing only one detecting means can be adopted, and a sheet post-processing device having a simple structure, low cost and high reliability is provided. That is.

A second object of the present invention is to detect in advance a defect associated with the use of jobs between users and a defect due to a motor or a sensor for changing an angle, and to perform a paper post-processing operation without waste. It is an object of the present invention to provide a sheet post-processing device that can perform the above.

A third object of the present invention is to, when the stapler moves in the direction opposite to the angle changing direction, confirm the change of the detection signal from the detecting means for the first time accompanying the movement and then rotate the motor for changing the angle. It is reversely stored in advance in the storage device from the time when the detection signal changes for the second time (or, when the stapler moves in the same direction as the angle changing direction, from the time when the detection signal from the detection unit changes for the first time). The present invention is to provide a sheet post-processing apparatus that can always perform stipple by constantly changing the angle by controlling the stipple angle based on the value.

A fourth object of the present invention is to provide a sheet post-processing apparatus which can warn a user and prevent the stapler from being broken due to a failure of the detecting means.

A fifth object of the present invention is to provide a sheet post-processing apparatus capable of stippling at an arbitrary angle from an external input such as an operating section and performing stippling at an angle according to a user's preference. It is to be.

A sixth object of the present invention is to make it compact by restricting the space in which the stapler moves, and to prevent diagonal stapling in the stapling mode while moving to two intermediate positions on the sheet. It is to provide a sheet post-processing device capable of performing the same.

[0010]

A first object of the present invention is to locate a sheet aligning tray for stacking sheets with sheets aligned and an end face portion of the sheet stacked on the sheet aligning tray.
A stapler for binding sheets, a stapler moving means for moving the stapler along the end face thereof, and a sheet post-processing device having a binding angle changing means capable of changing the binding angle of the stapler, in the case of changing the binding angle. This is solved by a first means which has one detection means for detecting the angular position of the stapler, and which has a predetermined rotation direction at the time of operation of the motor for changing the binding angle based on the signal detected by the detection means. .

The second problem is that in the first means,
After confirming the job that uses the stapler, after checking whether the position of the stapler is at the home position,
This is solved by the second means for performing control to move to the next operation for stippling such as the stapler movement by the stapler moving means and the binding angle change by the binding angle changing means.

[0012] The third problem is that in the first means,
When the binding angle changing unit changes the binding angle of the stapler, if the rotation direction during operation of the motor that changes the binding angle based on the signal detected by the detection unit is determined to be the opposite direction, once the direction is opposite. After confirming the change in the signal detected by the detecting means by rotating the motor in the direction, the motor is rotated in the reverse direction and the stapler is rotated again based on the value previously stored in the storage device from the time when the signal detected by the detecting means changes. It is solved by the third means for performing the angle control of.

The above-mentioned fourth problem is in the first means,
Even if the binding angle changing means starts the binding angle changing operation, if the detecting means for detecting the position of the stapler does not change within the value stored in advance in the storage device, the operation is stopped and the user It is solved by the fourth means for controlling to give a warning to that effect.

The fifth problem is that in the first means,
When the binding angle of the stapler is changed by the binding angle changing unit, the value stored in advance in the storage device for performing the binding angle control of the stapler is changed to an arbitrary value by an external input so that a staple having an arbitrary binding angle is obtained. It is solved by the fifth means for carrying out.

The sixth problem is that in the first means,
When it is necessary to move the stapler by the stapler moving means and change the stitching angle of the stapler, the stapler is held at the home position during the movement of the stapler by the stapler moving means, and the stitching angle is changed after the movement of the stapler is completed. It is solved by the sixth means for controlling the angle to be changed by the means.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a sheet post-processing apparatus according to an embodiment. The sheet post-processing apparatus is attached to a side portion of the image forming apparatus 1, and guides the sheet discharged from the image forming apparatus 1 to the sheet discharge tray 3 directly by the deflecting claw 2 and a sort / stack conveyance path A and It is configured so as to be guided to the stipple conveyance path B for stipple binding, and the stipple-stitched sheets are finally stacked on the discharge tray 3 located on the most downstream side. Denoted at 4 is a conveyance roller for receiving the sheet discharged from the image forming apparatus 1, and an entrance sensor S is provided immediately before the conveyance roller.
1 is provided so that the leading edge and the trailing edge of the conveyed sheet can be detected. The deflecting claw 2 is arranged on the downstream side of the transport roller 4, and the deflecting claw 2 is driven by a solenoid, a spring and the like (not shown).

A plurality of conveying rollers 5 and 6 and driven rollers 7 and 8 which are driven by the conveying rollers 5 and 6 are arranged on the sort / stack conveying path A, and the sheets discharged from the image forming apparatus 1 are directly discharged onto a sheet discharge tray. Lead to 3. Further, also in the staple conveying path B for stapling, a plurality of conveying rollers 9 and 10 and driven rollers 11 and 12 are arranged,
Guide the paper to the staple unit C.

Next, the outline of the staple unit C will be described with reference to FIGS. 2 and 3 and FIG. FIG.
Is a side view of the staple unit, and FIG. 3 is a front view of the same. Here, the front surface means the front surface of the hand when the apparatus is installed, and the side surfaces mean the left and right sides thereof, as shown in FIG. The staple unit C includes a stapler 13 that is movable in the direction perpendicular to the paper surface according to the paper size, and a brush roller 1 that moves the trailing edge of the discharged paper to the guide plate 14.
5 and a pair of jogger fences 27 for aligning in the direction orthogonal to the transport direction, the guide plate 14 for the discharged paper.
It is composed of a tapping roller 16 for pulling to the side, a discharge belt 17 for discharging stapled sheets to the discharge tray 3, a discharge claw 18 fixed to the discharge belt 17, and the like.
The tapping roller 16 can be moved to the position indicated by the broken line, and is moved and rotated each time the paper is ejected to move it toward the guide plate 14.

Next, the structure of the sheet discharge section for the sheet discharge tray 3 will be described with reference to FIG. 4 and FIG. FIG. 4 is an enlarged configuration diagram near the discharge tray. At the discharge port, there are paper discharge rollers 19 and 21 for discharging both the non-stipple paper and the staple-stitched paper to the paper discharge tray 3, and at the lower part thereof, a paper moving sponge roller 20 is arranged. The paper that has fallen onto the paper discharge tray 3 is abutted against the abutting guide plate 24 by its rotation, and the rear ends of the paper are aligned. Also, the output tray 3
Can be moved in the vertical direction by the upper and lower guide rollers 22 and is driven by a drive mechanism (not shown).
The paper discharge tray 3 can also be moved in a direction orthogonal to the paper discharge direction by the shift guide roller 23, and the shift operation is also performed by a drive mechanism (not shown).

Here, in the paper adhering sponge roller 20,
An upper surface detection lever 26 and a sensor S4 for detecting the upper surface of the discharged sheet are provided in conjunction with this.
The upper surface of ejected and stacked paper is always the ejection roller 1
The height of the paper discharge tray 3 is adjusted so that it is at a fixed position with respect to 9.

Further, the paper discharge driven roller 21 normally enters a position in contact with the paper discharge roller 19, but can be moved together with the paper discharge guide plate 25 around the fulcrum a to a position indicated by a chain line if necessary. And is moved by a drive mechanism (not shown).

The operation is divided into two types: a sort / stack mode in which sheets are discharged to the discharge tray 3 one by one without stippling, and a staple mode in which sheets are discharged after staple binding.

(1) In sort / stack mode The deflecting claw 2 is located at the position indicated by the broken line in FIG. 1, and the sheet discharged from the image forming apparatus 1 is sent to the sort / stack carrying path A, and the carrying roller 5 is used. , 6 to the discharge port. At this time, the paper discharge driven roller 21 is always in contact with the paper discharge roller 19 under its own weight or under pressure by a spring or the like, and the paper is discharged to the paper discharge tray 3 by this.

After the trailing edge of the sheet is ejected from the sheet ejection roller 19, the sheet advancing sponge roller 20 is rotated to abut against the guide plate 24, and the trailing edge is aligned and stacked. A predetermined number of sheets of paper are sequentially discharged to the paper discharge tray 3, and the upper surface of the stacked paper is detected by the sensor S4 so that the upper surface of the stacked paper is always placed at a constant position.

If necessary, the paper discharge tray 3 shifts in a direction orthogonal to the paper discharge direction,
Sort paper.

(2) In the staple mode The deflection claw 2 is in the position shown by the solid line in FIG. 1, and the sheet discharged from the image forming apparatus 1 is guided to the staple path B and conveyed to the staple unit C. It In the staple unit C, a predetermined aligning operation is performed, and a staple binding operation is performed.

Next, the sheet bundle is conveyed toward the sheet discharge roller 19 by the rotation of the sheet discharge belt 17 stretched along the sheet discharge direction b (see FIG. 1) and the sheet discharge claw 18 fixed thereto. It At this time, the paper discharge driven roller 21 has moved to the position indicated by the alternate long and short dash line in FIG. 4, and is located at a position separated from the paper discharge roller 19.

The bundle of sheets bound in this state passes through the sheet discharge rollers 19 and 21, and before the trailing end of the sheet bundle passes through the sheet discharge roller 19, the sheet discharge driven roller 21 and the sheet discharge guide plate 25.
Moves from the separated position to the position where the paper is pressed,
Eject the paper.

The present timing is detected by the sensor S3. After being discharged, the stapled paper is abutted against the guide plate 24 by its own weight and the rotation of the paper moving sponge roller 20, and the rear ends of the paper are aligned and stacked. The ejected sheet bundle is the number of copies
The sheets are sequentially discharged onto the sheet discharge tray 3, and are stacked so that the upper surfaces of the sheets are always at a constant position, as in the sort / stack mode.

Next, the moving mechanism of the stapler 13 will be described with reference to FIGS. 5 is a front view showing the moving mechanism of the stapler, FIG. 6 is a side view of the stapler parallel to the sheet end surface, FIG. 7 is a side view of the stapler inclined with respect to the sheet end surface, and FIG. 8 is a staple unit. FIG.

The stapler 13 has a stapler fixing table 58.
The pin 56 and the pin 57 are fixed on the stapler center line of the stapler fixing base 58, which are fitted into the arc-shaped portion 31a and the long hole 31b provided on the stapler rotary base 31. The stapler 13 is slidable along the shape. The arcuate portion 31a is formed symmetrically with respect to the center line of the stapler 13, and the rotation locus of the stapler 13 also moves symmetrically.

The pin 66 is attached to the stapler rotary base 31.
Is fixed, and this is fitted in a round hole 50c provided in the arc-shaped worm wheel 50, and the arc-shaped worm wheel 50 rotates left and right around the round hole c. Further, the stapler fixing base 58 is fixed to the long hole 50b provided in the arc-shaped worm wheel 50, and the arc-shaped portion 31 provided in the stapler rotary base 31.
The pin 56 fitted in a is fitted.

Therefore, the arc-shaped worm wheel 5
The pin 56 fitted in the elongated hole 50b rotates left and right with the left and right rotation of 0, and the stapler fixing base 58 and the stapler 13 to which the pin 56 is fixed rotate left and right.

The rotation angle of the stapler fixing base 58 is
Ribs 50a provided on the arc-shaped worm wheel 50
5 whose end is fixed to the stapler turntable 31
5 is on the verge of being shielded, that is, the non-detection state of the sensor 55 is the home position of the stapler 13.

When the sensor 55 is not detected when it is fixed to the home position, the stepping motor 5
At step 4, the end of the rib 50a rotates in the direction to shield the sensor 55, and once it is shielded, that is, after the sensor 55 confirms the detection, the stepping motor 54 is rotated in the reverse direction again, and the stepping is performed at the moment of non-detection. The motor 54 is fixed.

On the other hand, when the sensor 55 is detecting, the stepping motor 54 is rotated in the non-detecting direction and fixed at the moment of non-detecting.

In the above, the home position is detected by the sensor 55.
Although it is stopped and fixed just before the shielding, the point of shielding may be set to the home position. In this case, the sensor 55 is fixed at the moment of shielding. The fixed position of the sensor 55 may be a position where the end of the rib 50a can be detected, and the sensor 55 may be a position where the position of the worm wheel 50 can be detected.

Next, a method of changing the binding angle of the stepping motor will be described. A method of operating the arc-shaped worm wheel 50 will be described below. The arc-shaped worm wheel 50 meshes with a worm wheel 52 fixed to the stapler rotary base 31, and a pulley 65 is fixed coaxially with the worm wheel 52. The pulley 65 is attached to the stepping motor 54. Drive is transmitted via a fixed pulley 53 and a timing belt 59, and the stepping motor 54 is fixed to the stapler rotary base 31.

The rotation locus of the stapler 13 is the same as the arcuate portion 31a provided on the stippler rotary table 31, and the rotation center of the stippler 13 at that time is determined by the distance between the two axes of the pin 56 and the pin 57. Pin 5
7 rotates while sliding up and down on the long hole 31b fitted therein.

When trying to rotate the stapler 13 with the pin 57 as a fixed center of rotation, the position of the staple after oblique binding with respect to the paper is not good, so it is determined by the distance between the two axes as described above. Therefore, in order to absorb the movement deviated from the rotation locus of the stapler 13 when the pin 57 is set as the fixed rotation center, the pin 57 is provided with the long hole 3
Slide up and down on 1b.

The rotation direction of the stepping motor 54 is determined by the detection and non-detection of the sensor 55. The rotation direction is the non-detection direction when the sensor 55 detects the rib 50a, and the non-detection direction. Set to rotate in the direction of detection.

9 to 12 are explanatory views showing the rotation direction of the stepping motor depending on the positional relationship between the sensor and the worm wheel. In FIG. 9, since the sensor 55 is at the home position in the non-detection state, the stepping motor 54 starts rotating in the direction detected by the sensor 55, that is, in the counterclockwise direction. When performing the initialization, when the state shown in FIGS. 9 and 12 is changed to the state shown in FIG. 11, the stepping motor 54 is rotated according to the determination of the rotation direction of the stepping motor 54, and when the detection position 70 of the sensor 55 is passed. That is, if there is a change in the detection signal of the sensor 55, stop the stepping motor 54,
In the state of FIG. 10, the stepping motor 54 is rotated according to the determination of the rotation direction, and the detection position 70 of the sensor 55 is detected.
After passing, that is, when there is a change in the detection signal of the sensor 55, the stepping motor 54 is stopped.

When the binding angle is changed, the stepping motor 54 is rotated according to the rotation direction of the stepping motor 54. If the stapler 13 moves in the same direction as the binding angle changing direction, the sensor 5
When 5 is detected from non-detection, as shown in FIG. 10, the number of pulses is controlled until the binding angle of the stepping motor 54 is reached based on the value stored in advance, and when the binding angle is reached, the stepping motor 54 is turned on. Stop.

The stapler 1 is moved in the direction opposite to the binding angle changing direction.
3 moves, as shown in FIG. 11, when the sensor 55 detects the rib 50a, the ribs are rotated in the reverse direction, and from the time when the sensor 55 becomes non-detected, the value stored in advance in the storage device is changed as shown in FIG. Based on this, the number of pulses of the stepping motor 54 is controlled until the binding angle is reached, and the stepping motor 54 is stopped.

Further, since a value for controlling the binding angle can be input from an external input such as the operation / display panel 80 of FIG. 16, the user can select an arbitrary angle as desired. In the series of operations from the initialization to the binding angle change, if the detection signal of the sensor 55 does not change within a certain pulse or within a certain time, the operation is stopped, and the operation / display panel 80 of FIG. Is displayed on the display 81.

Next, the stapler movement will be described.
The stapler rotary base 31 is inserted into the guide hole 30b of the stapler slider 30 via the guide pin 32 and is indicated by an arrow C in FIG.
Movably engaged in the direction. Further, a shaft 44 is fixed to the back side of the stapler rotary table 31.
4, a guide roller 34 is rotatably attached.
The upper portion of the stapler slider 30 has side plates 41, 4
The guide roller 36, which is attached to the lower part of the stapler slider 30, while being slidably mounted in the direction perpendicular to the paper surface of FIG. The stay 43 is in contact with the surface of the stay 43 on the main body side so as to roll, and thereby the stapler slider 30 is locked in the rotational direction.

A guide cam 35 is fixed to the stay 43, and a guide roller 34 is rotatably abutted on the cam surface formed on the upper end side of the guide cam 35. As a result, the stapler slider 30 is reciprocated in the direction of arrow k in FIG.

At this time, the central portion of the guide cam 35 is formed so as to drop downward, so that the stapler slider 30 can be moved.
The stapler slider 30 is provided with a detection plate 30a. The detection plate 30a shields the detection portion of the home position sensor 40 provided on the main body side so that the home position of the stapler 13 can be detected. Has become.

A stepping motor 39 for moving the stapler is attached to the side plate 41. An intermediate portion of the belt 38 driven by the stepping motor 39 is fixed to the stapler slider 30 so that the stapler slider 30 is fixed. It is adapted to reciprocate in the left-right direction in FIG.

FIG. 13 is an overall flow chart of the stippling process. First, it is determined whether or not stippling processing is to be performed, and if it is to be performed (Y in S1), initialization is performed (S
2) Next, it is judged whether or not there is a problem with the binding angle changing means.
(S3). If there is no problem, it is determined whether or not diagonal binding will be performed next (S4), and if diagonal binding is performed, it is determined whether or not the stapler will move (S5). In the case of movement, it is moved to the stipple position (S6), and an angle is added by the binding angle changing means (S6).
7). If there is a problem with the binding angle changing means, the job is interrupted (S8) and a warning to that effect is issued (S9). If the diagonal binding is not performed, the stippling process is performed as usual (S1
0).

FIG. 14 is a flowchart of the binding angle changing operation. First, it is determined whether or not it is initial (S11), and if it is performed, the stepping motor 54 for changing the binding angle is used.
Is rotated in a fixed direction based on the detection signal of the sensor 55.
(S12). Next, it is judged whether the flag 1 is "1" (S13),
When it is "1", it is determined whether the sensor 55 is off (S1
4) If it is off, the stepping motor 54 is stopped (S15) and the flag is set to "0" (S16). If the flag is not "1", it is determined whether the sensor 55 is on (S
17) If it is on, the flag is set to "1" (S18). If it is not initial, the stepping motor 54 is similarly rotated in a fixed direction based on the detection signal of the sensor 55 (S19). Then, it is determined whether the binding angle changing direction and the rotation direction of the stepping motor 54 are the same (S20), and if they are the same, it is determined whether the flag 2 is "1" (S21).
If not "1", it is determined whether the sensor 55 is on (S
twenty two). If it is on, the stepping motor 54 is controlled based on the value in the storage device (S23), and the flag 2 is set to "0" (S24). If the flag 2 is "1", it is determined whether the sensor 55 is off (S25). If it is off, the process proceeds to step S23. If the binding angle changing direction and the motor rotating direction are not the same, it is determined whether the sensor 55 is on (S
26) If it is on, set flag 2 to "1".

FIG. 15 is a control block diagram of the main part. CPU90 with built-in timer, ROM91, RAM92, I /
The RAM 92 is provided with the O93, and the RAM 92 stores the detection data of the sensor 55 for detecting the stapler position. Further, the CPU 90 outputs a command to the stepping motor 54 for changing the binding angle through the I / O 93.

In the above-described embodiment, the sheet aligning tray for stacking the sheets with the sheets aligned, the stapler 13 for binding the sheets, which is located at the end face of the sheet stacked on the sheet aligning tray, In a sheet post-processing apparatus including a stapler moving unit that moves the stapler 13 along the end face and a binding angle changing unit that can change the binding angle of the stapler 13, the angular position of the stapler 13 when the binding angle is changed is detected. A binding angle detecting sensor 55 is provided, and the binding angle detecting sensor 55 is provided.
The motor 5 that changes the binding angle according to the signal detected from
Since the rotation direction at the time of the operation of No. 4 is predetermined, the angle changing motor 54 detects the binding angle detection sensor 55 when the angle changing means for changing the binding angle on the front side and the back side of the sheet is provided. Since the direction in which the stapler 13 is rotated is determined in advance, it is possible to employ a mechanism in which the stapler 13 returns to the home position once and then moves to the predetermined position only by providing one binding angle detecting sensor 55. It is possible to provide a simple, inexpensive and highly reliable sheet post-processing device.

Further, in the above-mentioned embodiment, after confirming the job using the stapler 13, after confirming whether the position of the stapler 13 is at the home position, the stapler moving means moves the stapler and the binding angle changing means. In order to perform control to move to the next operation for stapling such as changing the binding angle by using, when the job using the stapler 13 can be confirmed, it is confirmed whether the position of the stapler 13 is in the home position. A motor 54 that changes the angle or malfunctions caused by user use
It is possible to detect a defect due to a failure of a sensor or a sensor in advance and perform a paper post-processing operation without waste.

Further, in the above-mentioned embodiment, when the binding angle of the stapler 13 is changed by the binding angle changing means, the motor 54 for changing the binding angle by the signal detected by the binding angle detecting sensor 55 is used. When it is determined that the rotation direction during operation is the opposite direction, the motor is rotated in the opposite direction once and the change in the signal detected by the binding angle detection sensor 55 is confirmed, and then the motor 54 is rotated in the reverse direction from the binding angle detection sensor 55 again. Since the angle of the stapler 13 is controlled based on the value stored in advance in the storage device from the time when the detected signal changes, when the angle is changed by the stitching angle changing means of the stapler 13, the stitching is started at the angle changing operation. Since the rotation direction is determined by the state of the angle detection sensor 55, if the stapler 13 moves in the opposite direction to the angle changing direction, it will be accompanied by the movement. 1 round of binding angle detection sensor 55
After confirming the change of the detection signal from, the rotation of the motor for changing the angle is reversed and from the time when the detection signal changes for the second time (or when the stapler 13 moves in the same direction as the angle changing direction, the first time). By performing the stipple angle control based on the value stored in advance in the storage device (from the time when the detection signal from the binding angle detection sensor 55 changes), the stipple can be always performed by a constant angle change.

Further, in the above-described embodiment, even if the binding angle changing operation is started by the binding angle changing means, the position of the stapler 13 is detected within the value stored in advance in the storage device for binding angle detection. When the sensor 55 does not change, the operation is stopped and the user is warned accordingly. Therefore, if there is no change in the binding angle detection sensor 55 within a certain time, the operation is stopped and the user is warned. Therefore, it is possible to prevent the stapler from breaking due to the failure of the binding angle detecting sensor 55.

Further, in the above embodiment, when the binding angle of the stapler 13 is changed by the binding angle changing means, the value stored in advance in the storage device for controlling the binding angle of the stapler 13 is arbitrarily input by external input. The binding angle control value stored in the storage device can be changed from an external input such as the operation unit to change the binding angle to the stapling angle. Stipple can be performed, and stipple can be performed at an angle according to the user's preference.

In the above embodiment, the stapler moving means moves the stapler and the stapler 1 moves.
When it is necessary to change the stitching angle of 3, the stapler 13 is held at the home position during the movement of the stapler by the stapler moving means, and after the movement of the stapler 13 is controlled, the angle is changed by the stitching angle changing means. When the stapler 13 is moved back along its end face according to the paper size, it is always returned to the home position, so that the space in which the stapler 13 moves can be restricted, so that the stapler 13 can be made compact. It is possible to prevent binding at an angle in the binding mode while moving at different places.

[0059]

According to the first aspect of the invention, when the angle changing means for changing the binding angle between the front side and the rear side of the sheet is provided, the direction in which the motor for changing the angle rotates according to the detection result of the detecting means is changed. Since it is predetermined, it is possible to adopt a mechanism in which the stapler returns to the home position once and then moves to the predetermined position by providing only one detecting means. The structure is simple, inexpensive, and highly reliable. A processing device can be provided.

According to the second aspect of the present invention, if the job using the stapler can be confirmed, it is confirmed whether the position of the stapler is at the home position. Therefore, a problem caused by the user's use between jobs and an angle change. It is possible to detect a defect due to a failure of a motor or a sensor that operates, and perform a paper post-processing operation without waste.

According to the third aspect of the invention, when the angle is changed by the stapler binding angle changing means, the rotation direction is determined by the state of the detecting means at the start of the angle changing operation. On the contrary, when the stapler moves, the rotation of the motor for changing the angle is reversed after confirming the change of the detection signal from the detecting means for the first time accompanying the movement.
From the time when the second detection signal changes (or when the stapler moves in the same direction as the angle changing direction, from the time when the detection signal from the first detection means changes) to a value previously stored in the storage device. By controlling the angle of the stipple based on this, it is possible to perform the stipple by constantly changing the angle.

According to the fourth aspect of the invention, when the binding angle changing means of the stapler is used to change the angle, the detecting means always detects the mechanism, so that the detecting means changes to a certain time. If there is not, the operation is stopped and the user is warned, so that it is possible to prevent the stapler destruction due to the failure of the detecting means.

According to the fifth aspect of the invention, since the binding angle control value stored in the storage device can be changed by an external input such as the operation section, stapling can be performed at an arbitrary angle. The stippling can be performed at an angle according to the user's preference.

According to the sixth aspect of the invention, when the stapler is always returned to the home position when the stapler is moved along its end face according to the paper size, the space in which the stapler moves can be restricted, thereby making the device compact. Further, it is possible to prevent the binding at an angle in the binding mode while moving the sheet to two intermediate positions.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a sheet post-processing apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of the staple unit.

FIG. 3 is a front view of the same.

FIG. 4 is an enlarged configuration diagram in the vicinity of a paper discharge tray.

FIG. 5 is a front view showing a moving mechanism of a stapler.

FIG. 6 is a side view of the stapler in a state in which the stapler is parallel to the sheet end surface.

FIG. 7 is a side view of the stapler in a state of being inclined with respect to a sheet end surface.

FIG. 8 is an exploded perspective view of a staple unit.

FIG. 9 is an explanatory diagram showing a rotation direction of a stepping motor depending on a positional relationship between a sensor and a worm wheel.

FIG. 10 is an explanatory diagram showing a rotation direction of a stepping motor depending on a positional relationship between a sensor and a worm wheel.

FIG. 11 is an explanatory diagram showing a rotation direction of a stepping motor depending on a positional relationship between a sensor and a worm wheel.

FIG. 12 is an explanatory diagram showing a rotation direction of a stepping motor depending on a positional relationship between a sensor and a worm wheel.

FIG. 13 is an overall flowchart of stipple processing.

FIG. 14 is a flowchart of a binding angle changing operation.

FIG. 15 is a control block diagram of a main part.

FIG. 16 is an explanatory diagram showing an operation / display panel.

[Explanation of symbols]

 13 stapler 39 motor for moving stapler 54 motor for changing binding angle 55 sensor for detecting binding angle

Claims (6)

[Claims] 1. A paper aligning tray for stacking sheets in an aligned state, a stapler for binding sheets positioned on an end face of the sheets stacked on the paper aligning tray, and a stapler for moving the stapler along the end face. A sheet post-processing apparatus including a moving unit and a binding angle changing unit capable of changing the binding angle of the stapler, comprising one detection unit that detects an angular position of the stapler when changing the binding angle, and A sheet post-processing apparatus characterized in that a rotation direction of a motor for changing a binding angle is determined in advance by a signal detected from a means. 2. The sheet post-processing apparatus according to claim 1, when a job using the stapler can be confirmed,
After confirming whether the position of the stapler is at the home position, control is performed to move to the next operation for stippling such as moving the stapler by the stapler moving unit and changing the binding angle by the binding angle changing unit. Paper post-processing device. 3. The sheet post-processing apparatus according to claim 1, wherein, when the binding angle of the stapler is changed by the binding angle changing unit, the binding angle of the motor is changed by a signal detected by the detecting unit. If the rotation direction during operation is determined to be the opposite direction, after rotating once in the opposite direction and confirming the change in the signal detected from the detection means,
A sheet post-processing apparatus, characterized in that the motor is rotated in the reverse direction and the angle of the stapler is controlled based on a value stored in advance in a storage device from the time when the signal detected by the detection means changes again. 4. The sheet post-processing apparatus according to claim 1, wherein the position of the stapler is detected within a value stored in advance in the storage device even when the binding angle changing operation is started by the binding angle changing unit. A sheet post-processing apparatus characterized in that, when no change occurs in the detection means, the operation is stopped and a warning is given to the user. 5. The sheet post-processing apparatus according to claim 1, wherein when the binding angle of the stapler is changed by the binding angle changing unit, a value stored in advance in a storage device that controls the binding angle of the stapler is externally stored. A sheet post-processing apparatus characterized by changing to an arbitrary value by input and performing stapling at an arbitrary binding angle. 6. The sheet post-processing apparatus according to claim 1, wherein when the stapler moving means needs to move the stapler and the binding angle of the stapler needs to be changed, the stapler is moved to the home position while the stapler moving means is moving the stapler. The sheet post-processing apparatus is characterized in that the binding angle changing means controls the angle after the stapler has been moved.