Post-processing device and image forming system

Abstract

To provide a post-processing device which facilitates a stable needle replenishing work.SOLUTION: A post-processing device includes: a motor (42); a ratchet gear (49) which is normally rotated and inversely rotated by transmission of a drive force of the motor (42); a drive force unit (40) for moving a binding processing unit (25) to one side in a main scanning direction interlocking with the normal rotation of the ratchet gear (49), and moving the binding processing unit (24) to the other side in the main scanning direction interlocking with the inverse rotation of the ratchet gear (49); and a rotation regulation member (50) which is switchable between a permission posture of permitting the normal rotation and the inverse rotation by being separated from the ratchet gear (49), and a regulation posture of permitting the normal rotation and regulating the reverse rotation by being brought into contact with the ratchet gear (49).SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a post-processing device and an image forming system. [Background technology]

[0002] Conventionally, there has been known a post-processing device that includes a tray that supports a bundle of sheets of paper (hereinafter, referred to as a "sheet stack") and a binding processing unit that uses staples to bind the sheet stack supported by the tray. The binding processing unit has a cartridge that contains a plurality of staples and is configured to be movable along the sheet stack supported by the tray.

[0003] In such a post-processing device, when the number of staples in the cartridge decreases, the user needs to replenish the cartridge with new staples. Therefore, there is a technology that makes it easy to replenish staples by locking the movement of the binding processing unit in conjunction with the opening of the opening and closing door (for example, see Patent Document 1). Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the post-processing device having the above configuration, even if a jam occurs in the binding processing section inside the post-processing device, the movement of the binding processing section is locked when the opening and closing door is opened, which causes a problem that the work of replenishing staples becomes cumbersome.

[0005] SUMMARY OF THE PRESENT EMBODIMENT The present invention has been made to solve the above problems, and has an object to provide a post-processing device which allows easy replenishing of staples. [Means for solving the problem]

[0006] In order to solve the above problem, one aspect of the present invention provides a binding apparatus including a conveying unit that conveys a medium on which an image has been formed by an image forming apparatus, a tray that supports the plurality of media conveyed by the conveying unit, a binding processing unit that has a cartridge that contains a plurality of staples and that staples the plurality of media supported on the tray using the staples contained in the cartridge, and a movement mechanism that moves the binding processing unit in a main scanning direction perpendicular to a direction in which the media are conveyed by the conveying unit. a housing that houses the conveying unit, the tray, the binding processing unit, and the moving mechanism; and a cover that is supported on the housing so as to be openable and closable. In the post-processing device, the moving mechanism includes a motor, a ratchet gear to which a driving force of the motor is transmitted to rotate in a forward direction and a reverse direction, a driving force transmission unit that moves the binding processing unit to one side in the main scanning direction in conjunction with the forward rotation of the ratchet gear and moves the binding processing unit to the other side in the main scanning direction in conjunction with the reverse rotation of the ratchet gear, and a rotation restricting member that is switchable between an allowable position in which the binding processing unit is separated from the ratchet gear to allow forward and reverse rotation, and a restricting position in which the binding processing unit is in contact with the ratchet gear to allow forward rotation and restrict reverse rotation. The rotation restricting member is brought into the permissive position in conjunction with the closing of the cover, and is brought into the restricting position in conjunction with the opening of the cover. It is characterized by: Effect of the Invention

[0007] According to the present invention, a post-processing device that allows easy replenishing of staples can be obtained. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing an overall configuration of an image forming system. [Diagram 2] FIG. 2 is a diagram showing an internal structure of the post-processing device. [Diagram 3] FIG. 4 is a diagram showing the moving mechanism with the cover closed. [Figure 4] FIG. 4 is a diagram showing the moving mechanism with the cover open. [Diagram 5] FIG. 2 is a hardware configuration diagram of a post-processing device. [Figure 6] 13 is a flowchart of a staple process. [Figure 7] FIG. 13 is a diagram showing a moving mechanism according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An image forming system 1 according to the present invention will be described below with reference to the drawings. Fig. 1 is a diagram showing the overall configuration of the image forming system 1. The image forming system 1 has a function of forming an image on a sheet of paper and performing post-processing on the sheet of paper on which the image has been formed. As shown in Fig. 1, the image forming system 1 is made up of an image forming device 2 and a post-processing device 3.

[0010] The image forming device 2 forms an image on paper (medium) and discharges the paper on which the image has been formed to the post-processing device 3. The image forming device 2 mainly comprises a tray in which paper is stored, a transport section which transports the paper stored in the tray, and an image forming section which forms an image on the paper transported by the transport section. The image forming section may be of an inkjet type which forms an image using ink, or of an electrophotographic type which forms an image using toner. The configuration of the image forming device 2 is already known, so a detailed description will be omitted.

[0011] 2 is a diagram showing the internal structure of the post-processing device 3. The post-processing device 3 performs post-processing on the sheets of paper on which images have been formed by the image forming device 2. The post-processing according to this embodiment is a stapling process that uses staples to bind a stack of multiple sheets of paper on which images have been formed (hereinafter referred to as a "sheet stack"). The stapling process includes an end stapling process that binds the ends of the sheet stack, and a saddle stapling process that binds the center of the sheet stack.

[0012] The post-processing device 3 includes transport roller pairs 10-19 (transport section) and a switching claw 20. The transport roller pairs 10-19 transport the paper supplied from the image forming device 2 inside the post-processing device 3. More specifically, the transport roller pairs 10-13 transport the paper along a first transport path Ph1. The transport roller pairs 14-15 transport the paper along a second transport path Ph2. The transport roller pairs 16-19 transport the paper along a third transport path Ph3.

[0013] The first transport path Ph1 is a path that extends from a paper supply port of the image forming device 2 to the discharge tray 21. The second transport path Ph2 is a path that branches off from the first transport path Ph1 between the pairs of transport rollers 11 and 14 in the transport direction, and leads to the discharge tray 26 through the internal tray 22. The third transport path Ph3 is a path that branches off from the first transport path Ph1 between the pairs of transport rollers 11 and 14 in the transport direction, and leads to the discharge tray 30.

[0014] The switching claw 20 is disposed at a branching position of the first transport path Ph1 and the second transport path Ph2. The switching claw 20 is configured to be switchable between a first position where the paper is discharged to the discharge tray 21 through the first transport path Ph1 and a second position where the paper transported through the first transport path Ph1 is guided to the second transport path Ph2. In addition, when the rear end of the paper that has entered the second transport path Ph2 passes through the transport roller pair 11, the transport roller pair 14 is rotated in the reverse direction to guide the paper to the third transport path Ph3. In addition, the post-processing device 3 includes a plurality of sensors (indicated by ▲ in FIG. 2) that detect the position of the paper on each of the transport paths Ph1, Ph2, and Ph3.

[0015] The post-processing device 3 includes a discharge tray 21. The discharge tray 21 supports the paper discharged through the first transport path Ph1. Of the papers supplied from the image forming device 2, those that are not to be stapled are discharged to the discharge tray 21.

[0016] The post-processing device 3 also includes an internal tray 22, an end fence 23, a side fence 24, a binding processing unit 25, and a discharge tray 26. The internal tray 22, the end fence 23, the side fence 24, and the binding processing unit 25 perform edge binding processing on the paper transported on the second transport path Ph2. A stack of paper that has been edge-stitched is discharged to the discharge tray 26 from the paper supplied from the image forming device 2. Hereinafter, the direction from the transport roller pair 15 toward the end fence 23 is defined as the "paper transport direction." Additionally, the direction perpendicular to the up-down direction and the paper transport direction is defined as the "main scanning direction (paper width direction)."

[0017] The internal tray 22 temporarily supports a plurality of sheets of paper that are transported in sequence along the second transport path Ph2. The end fence 23 aligns the position of the stack of sheets of paper supported by the internal tray 22 in the transport direction. The side fence 24 aligns the position of the stack of sheets of paper supported by the internal tray 22 in the main scanning direction. The binding processing unit 25 binds the ends of the stack of sheets of paper aligned by the end fence 23 and the side fence 24. Then, the pair of transport rollers 15 discharges the stack of sheets of paper that has been subjected to the end-stitching process onto the discharge tray 26.

[0018] Furthermore, the post-processing device 3 includes an end fence 27, a binding processing section 28, a paper folding blade 29, and a discharge tray 30. The end fence 27, the binding processing section 28, and the paper folding blade 29 perform saddle-stitching processing on the paper transported through the third transport path Ph3. A stack of paper that has been saddle-stitched among the paper supplied from the image forming device 2 is discharged to the discharge tray 30.

[0019] The end fence 27 aligns the positions in the conveying direction of multiple sheets of paper conveyed in sequence on the third conveying path Ph3. The end fence 27 is also configured to be movable between a binding position where the center of the stack of sheets faces the binding processing unit 28 and a folding position where the center faces the paper folding blade 29. The binding processing unit 28 staples the center of the stack of sheets aligned by the end fence 27 at the binding position. The paper folding blade 29 folds the stack of sheets supported by the end fence 27 at the folding position in half and clamps it between the conveying roller pair 18. The conveying roller pairs 18 and 19 discharge the stack of sheets that has been saddle-stitched to the discharge tray 30.

[0020] The post-processing device 3 has a box-shaped housing 4 having a plurality of walls (top wall, bottom wall, side walls, etc.). The pairs of conveying rollers 10-19, the switching claw 20, the internal tray 22, the end fences 23, 27, the side fences 24, the binding processing units 25, 28, and the paper folding blade 29 are housed in the internal space of the housing 4 of the post-processing device 3. The discharge trays 21, 26, 30 are supported by the housing 4 at positions exposed to the outside of the post-processing device 3.

[0021] Further, a cover 5 (see Figs. 3 and 4) is attached to the housing 4. The cover 5 is attached to, for example, a side wall of the housing 4 so as to be openable and closable. When the operator closes the cover 5, an opening provided in the housing 4 is closed. On the other hand, when the operator opens the cover 5, an opening provided in the housing 4 is exposed, and the binding processing section 25 and the moving mechanism 40 (see Figs. 3 and 4) become accessible. Although Figs. 3 and 4 show a sliding cover 5, the method of opening and closing the cover 5 is not limited thereto. As another example, the cover 5 may be supported on the housing 4 so as to be rotatable via a hinge.

[0022] The moving mechanism 40 that moves the binding processing unit 25 will be described in detail with reference to Figures 3 and 4. Figure 3 is a diagram showing the moving mechanism 40 with the cover 5 closed. Figure 4 is a diagram showing the moving mechanism 40 with the cover 5 open. The moving mechanism 40 plays a role in moving the binding processing unit 25 in the main scanning direction along the outer edge of the paper stack supported by the internal tray 22. The moving mechanism 40 mainly includes a support member 41, a motor 42, spur gears 43, 44, and 45, pulleys 46 and 47, an endless circular belt 48, a ratchet gear 49, a rotation restriction member 50, and a coil spring 51 (biasing member).

[0023] The support member 41 supports the binding processing unit 25 rotatably around a support shaft perpendicular to the conveying direction and the main scanning direction. The support member 41 is fixed to an endless circular belt 48. That is, the binding processing unit 25 supported by the support member 41 is configured to be movable in the main scanning direction with the rotation of the endless circular belt 48. Of the movement range of the binding processing unit 25 in the main scanning direction, the position closest to the cover 5 (an opening provided in the housing 4) is the "home position (HP)", and any position supported by a controller 100 (see FIG. 5) described later is the "binding position".

[0024] The motor 42 generates a driving force for moving the binding processing unit 25. The driving force of the motor 42 is transmitted to the binding processing unit 25 (support member 41) via spur gears 43 to 45, pulleys 46 and 47, and an endless circular belt 48. The spur gears 43 to 45, the pulleys 46 and 47, and the endless circular belt 48 are an example of a driving force transmission unit.

[0025] The spur gear 43 is attached to the output shaft of the motor 42. The spur gears 44, 45 are meshed with the spur gear 43. The pulley 46 rotates integrally with the spur gear 44. The pulley 47 is disposed spaced apart from the pulley 47 in the main scanning direction. The endless circular belt 48 is wound around the pulleys 46, 47. That is, the endless circular belt 48 rotates around the pulleys 46, 47 by the driving force of the motor 42 being transmitted through the spur gears 43, 44 and the pulley 46. This causes the binding processing section 25 (support member 41) to move in the main scanning direction.

[0026] The ratchet gear 49 rotates integrally with the spur gear 45. The multiple teeth formed on the outer circumferential surface of the ratchet gear 49 have different inclination angles on both sides in the circumferential direction (more specifically, the inclination angle with respect to the normal direction). In this embodiment, the inclination angle on the front side when the ratchet gear 49 rotates clockwise (hereinafter referred to as "forward rotation") is set to be larger than the inclination angle on the front side when the ratchet gear 49 rotates counterclockwise (hereinafter referred to as "reverse rotation").

[0027] The rotation restricting member 50 is composed of a support shaft 50a, an abutted portion 50b, and a restricting portion 50c. The abutted portion 50b and the restricting portion 50c protrude radially outward from the support shaft 50a at different circumferential positions of the support shaft 50a. The rotation restricting member 50 is configured to be rotatable about the support shaft 50a between an allowable position shown in Fig. 3 and a restricted position shown in Fig. 4. In addition, a coil spring 51 biases the rotation restricting member 50 toward the restricted position.

[0028] As shown in Fig. 3, the contacted portion 50b contacts the closed cover 5. As a result, the rotation restricting member 50 changes (rotates) its posture from the restrictive posture to the permissive posture against the biasing force of the coil spring 51. Meanwhile, as shown in Fig. 4, the contacted portion 50b moves away from the open cover 5. As a result, the rotation restricting member 50 changes its posture from the permissive posture to the restrictive posture due to the biasing force of the coil spring 51. That is, the rotation restricting member 50 goes to the permissive posture in conjunction with the cover 5 being closed, and goes to the restrictive posture in conjunction with the cover 5 being opened.

[0029] 3, when the rotation restricting member 50 is in the permissive position, the restricting portion 50c is disposed in a position that does not contact the teeth of the ratchet gear 49. In other words, the rotation restricting member 50 in the permissive position permits both forward and reverse rotation of the ratchet gear 49.

[0030] On the other hand, as shown in FIG. 4, when the rotation restricting member 50 is in the restricting position, the restricting portion 50c is disposed at a position where it can come into contact with the teeth of the ratchet gear 49. At this time, when the ratchet gear 49 tries to rotate forward, the side of the teeth with a larger contact angle comes into contact with the restricting portion 50c, and the teeth go over the restricting portion 50c. As a result, the forward rotation of the ratchet gear 49 is permitted. On the other hand, when the ratchet gear 49 tries to rotate backward, the side of the teeth with a smaller contact angle comes into contact with the restricting portion 50c, and the teeth cannot go over the restricting portion 50c. As a result, the reverse rotation of the ratchet gear 49 is restricted. That is, the rotation restricting member 50 in the restricting position permits the forward rotation of the ratchet gear 49 and restricts the reverse rotation of the ratchet gear 49.

[0031] The movement direction of the binding processing unit 25 is linked to the rotation direction of the ratchet gear 49. That is, the binding processing unit 25 moves to one side in the main scanning direction indicated by the arrow a in association with the forward rotation of the ratchet gear 49. That is, the binding processing unit 25 can move to one side in the main scanning direction regardless of the posture of the rotation restricting member 50. Note that, in this embodiment, the "one side in the main scanning direction" is the direction in which the binding processing unit 25 approaches the cover 5 (in other words, the opening provided in the housing 4).

[0032] On the other hand, the binding processing unit 25 moves to the other side in the main scanning direction indicated by the arrow b in conjunction with the reverse rotation of the ratchet gear 49. That is, the binding processing unit 25 can move to the other side in the main scanning direction when the rotation restricting member 50 is in the permissive position, and cannot move to the other side in the main scanning direction when the rotation restricting member 50 is in the restrictive position. Note that, in this embodiment, the "other side in the main scanning direction" is the direction in which the binding processing unit 25 moves away from the cover 5 (in other words, the opening provided in the housing 4).

[0033] Furthermore, the binding processing unit 25 has a cartridge 52 and a remaining amount sensor 53. The cartridge 52 contains a plurality of staples. The binding processing unit 25 uses the staples contained in the cartridge 52 to bind a stack of paper supported by the internal tray 22. The user can replenish staples into the cartridge 52. The remaining amount sensor 53 detects the remaining amount of staples contained in the cartridge 52 (or the presence or absence of staples), and outputs a remaining amount signal indicating the detection result to the controller 100. The remaining amount sensor 53 can be realized by a well-known sensor such as a mechanical sensor or an optical sensor, for example.

[0034] Fig. 5 is a hardware configuration diagram of the post-processing device 3. As shown in Fig. 5, the post-processing device 3 includes a central processing unit (CPU) 101, a random access memory (RAM) 102, a read only memory (ROM) 103, a hard disk drive (HDD) 104, and an interface (I / F) 105, all of which are connected via a common bus 109.

[0035] The CPU 101 is a calculation means and controls the overall operation of the post-processing device 3. The RAM 102 is a volatile storage medium capable of reading and writing information at high speed, and is used as a working area when the CPU 101 processes information. The ROM 103 is a read-only non-volatile storage medium in which programs such as firmware are stored. The HDD 104 is a non-volatile storage medium capable of reading and writing information and has a large storage capacity, and stores an OS (Operating System), various control programs, application programs, etc.

[0036] The post-processing device 3 processes a control program stored in the ROM 103, an information processing program (application program) loaded from a storage medium such as the HDD 104 to the RAM 102, and the like, using the arithmetic functions of the CPU 101. A software control unit including various functional modules of the post-processing device 3 is configured by this processing. A combination of the software control unit configured in this manner and hardware resources mounted on the post-processing device 3 configures functional blocks that realize the functions of the post-processing device 3. That is, the CPU 101, the RAM 102, the ROM 103, and the HDD 104 configure a controller 100 that controls the operation of the post-processing device 3.

[0037] The I / F 105 is an interface that connects the pairs of conveying rollers 10, 11, 14, and 15, the switching claw 20, the side fence 24, the binding processing unit 25, the motor 42, the remaining amount sensor 53, and the operation panel 110 to the common bus 109. The controller 100 operates the pairs of conveying rollers 10, 11, 14, and 15, the switching claw 20, the side fence 24, the binding processing units 25 and 28, and the motor 42 through the I / F 105. Note that, although only components that perform the end binding process are illustrated in FIG. 5, components that perform the saddle stitching process are also controlled by the controller 100 in the same manner.

[0038] Operation panel 110 includes an operation unit that accepts operations from a user, and a display (notification unit) that notifies the user of information. The operation unit includes, for example, hard keys, a touch panel superimposed on the display, etc. Operation panel 110 obtains information from the user through the operation unit, and provides the information to the user through the display. Note that a specific example of the notification unit is not limited to a display, and may be an LED lamp, a speaker, etc.

[0039] Fig. 6 is a flowchart of the stapling process. The controller 100 starts the stapling process shown in Fig. 6, for example, when it receives an instruction to execute the stapling process (hereinafter referred to as a "stapling instruction") from the image forming apparatus 2. The stapling instruction includes, for example, the number of sheets constituting a paper stack (hereinafter referred to as a "predetermined number of sheets") and the number of paper stacks to be stapled (hereinafter referred to as a "required number of copies"). It is assumed that, at the start of the stapling process, the cover 5 is closed, the binding processing section 25 is located at the HP, and the cartridge 52 contains staples.

[0040] First, the controller 100 moves the binding processing unit 25 to a binding position (S601). The binding position is a position where the stack of sheets supported by the internal tray 22 is stapled. The binding position may be included in the staple instruction, or may be specified by the user via the operation panel 110. The controller 100 may grasp the position of the binding processing unit 25 by, for example, an encoder sensor attached to the output shaft of the motor 42.

[0041] Next, the controller 100 rotates the pairs of conveying rollers 10, 11, 14, and 15 to store the sheets of paper on which the images have been formed by the image forming device 2 in the internal tray 22 (S602). The controller 100 also aligns the position of the stack of sheets of paper supported by the internal tray 22 in the main scanning direction (jogging) by moving the side fence 24. Next, the controller 100 determines whether the number of sheets of paper stored in the internal tray 22 has reached a predetermined number indicated by the staple instruction (S603).

[0042] Then, when the controller 100 determines that the number of sheets stored in the internal tray 22 has not reached the predetermined number (S603: No), it executes the process of step S602 again. On the other hand, when the controller 100 determines that the number of sheets stored in the internal tray 22 has reached the predetermined number (S603: Yes), it performs edge stapling on the stack of sheets stored in the internal tray 22 and discharges them to the discharge tray 26 (S604).

[0043] More specifically, the controller 100 drives the binding processing unit 25 at the binding position to staple the paper stack stored in the internal tray 22 with the staples stored in the cartridge 52. Next, the controller 100 rotates the conveying roller pair 15 to discharge the paper stack that has been subjected to the edge-stitching process onto the discharge tray 26.

[0044] Next, the controller 100 judges whether or not staples are stored in the cartridge 52 based on the remaining amount signal output from the remaining amount sensor 53 (S605). If the controller 100 judges that staples are stored in the cartridge 52 (S605: Yes), the controller 100 judges whether or not the number of the discharged paper stacks has reached the required number of copies indicated by the staple instruction (S606).

[0045] Next, if the controller 100 determines that the required number of copies has not been reached (S606: No), it executes the processes from step S602 onwards again. On the other hand, if the controller 100 determines that the required number of copies has been reached (S606: Yes), it moves the binding processing unit 25 to the HP (S607) and ends the stapling process. That is, the controller 100 repeatedly executes the processes from step S602 to S605 until the number of paper bundles discharged to the discharge tray 26 reaches the required number of copies (S606: No).

[0046] Here, every time the process of step S604 is executed, the number of staples contained in the cartridge 52 decreases. Therefore, when it is determined that no staples are contained in the cartridge 52 in the process of repeating steps S602 to S605 (S605: No), the controller 100 executes the processes of steps S608 to S610 to cause the user to replenish staples.

[0047] First, the controller 100 moves the binding processing unit 25 to the HP (S608). At this time, the cover 5 is closed (in other words, the rotation restriction member 50 is in the permitted position), so the binding processing unit 25 can move to either side in the main scanning direction.

[0048] Next, the controller 100 displays on the display a message encouraging the supply of staples to the cartridge 52 (S609). The controller 100 continues to display the message until the remaining amount sensor 53 detects the presence of staples (S610: No). The method of notification is not limited to displaying the message, and may be lighting of an LED lamp or output of a guide voice through a speaker.

[0049] A user who sees this message opens the cover 5 and replenishes staples into the cartridge 52. At this time, the rotation restricting member 50 changes its position to the restricting position, thereby restricting the movement of the binding processing unit 25 in the direction away from the cover 5. On the other hand, if a JAM occurs in the binding processing unit 25 and it cannot move to the HP, the user can manually move the binding processing unit 25 to the HP.

[0050] Then, when the controller 100 determines that staples are contained in the cartridge 52 (S610: Yes), it performs self-priming to expose the tip of the staple contained in the cartridge 52, and then executes the processes from step S601 onwards again.

[0051] According to the above embodiment, for example, the following advantageous effects are achieved.

[0052] According to the above embodiment, by changing the posture of the rotation restricting member 50 to the restricting posture, the movement of the binding processing unit 25 in the direction away from the cover 5 (the other side in the main scanning direction) is restricted. This makes it possible to prevent the binding processing unit 25 from moving to the back of the housing 4 when staples are replenished to the cartridge 52. Even if a jam occurs in the binding processing unit 25 inside the housing 4, the binding processing unit 25 can be manually moved in the direction toward the cover 5 (one side in the main scanning direction). As a result, the task of replenishing staples to the cartridge 52 becomes easier.

[0053] Furthermore, according to the above embodiment, the posture of the rotation restricting member 50 changes in conjunction with the opening and closing of the cover 5, so that it is possible to reduce the number of parts required for changing the posture of the rotation restricting member 50 and to simplify the work of replenishing staples in the cartridge 52. However, the specific method for changing the posture of the rotation restricting member 50 is not limited to the above example.

[0054] Furthermore, according to the above embodiment, by opening the cover 5, the rotation restricting member 50 automatically returns to the permitting position by the biasing force of the coil spring 51. This further simplifies the operation of replenishing staples in the cartridge 52.

[0055] The position of the rotation restricting member 50 can also be changed using an electronic component such as a solenoid. However, this method creates a new problem of increased power consumption by the post-processing device 3. Therefore, as in the above embodiment, changing the position of the rotation restricting member 50 in conjunction with the opening and closing of the cover 5 (in other words, without using an electronic component such as a solenoid) also contributes to power saving in the post-processing device 3.

[0056] The specific configuration of the moving mechanism 40 is not limited to the examples shown in Figs. 3 and 4. Fig. 7 is a diagram showing a moving mechanism 40A according to a modified example. The moving mechanism 40A shown in Fig. 7 differs from the moving mechanism 40 shown in Figs. 3 and 4 in that the spur gears 44, 45 are omitted. The spur gear 43 attached to the output shaft of the motor 42 rotates integrally with the pulley 46 and the ratchet gear 49. In this way, any number of spur gears, belts, etc. can be used to transmit the driving force of the motor 42 to the endless circular belt 48 and the ratchet gear 49.

[0057] In addition, in the above embodiment and modified examples, an example has been described in which the binding processing unit 25 that performs the end binding process is moved by the moving mechanisms 40, 40A, but the moving mechanisms 40, 40A can also be applied to the binding processing unit 28 that performs the saddle stitch process.

[0058] The control method described above may be realized, for example, by a program. That is, the control method is a method executed by a computer by causing an arithmetic unit, a storage unit, an input unit, an output unit, and a control unit to cooperate with each other and operate based on the program. The program may be written in a storage unit or a storage medium, etc., and distributed, or distributed via a telecommunication line, etc.

[0059] The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the technical gist of the present invention. The present invention covers all technical matters included in the technical ideas described in the claims. The above-described embodiments are preferred examples, but a person skilled in the art can realize various modifications from the disclosed contents. Such modifications are also included in the technical scope described in the claims. [Explanation of symbols]

[0060] 1: Image forming system 2: Image forming device 3: Post-processing device 4: Housing 5: Cover 10 to 19: Transport roller pair 20: Switching claw 21, 26, 30: Output tray 22: Internal tray 23,27: End fence 24: Side fence 25,28: Binding processing section 29: Paper folding blade 40,40A: Moving mechanism 41: Support member 42: Motor 43, 44, 45: Spur gear 46,47: Pulley 48: Endless circular belt 49: Ratchet gear 50: Rotation restriction member 50a: Support shaft 50b: Abutted part 50c: Regulation section 51: Coil spring 52: Cartridge 53: Remaining amount sensor 100: Controller 101: CPU 102: RAM 103: ROM 104: HDD 105: Interface 109: Common bus 110: Operation panel [Prior art documents] [Patent documents]

[0061] [Patent Document 1] JP 2009-012892 A

Claims

1. a conveying unit that conveys a medium on which an image is formed by an image forming apparatus; a tray for supporting the plurality of media transported by the transport unit; a binding processing unit having a cartridge containing a plurality of staples and binding a plurality of media supported on the tray using the staples contained in the cartridge; a moving mechanism that moves the binding processing unit in a main scanning direction perpendicular to a medium conveying direction by the conveying unit; a housing that houses the conveying unit, the tray, the binding processing unit, and the moving mechanism; A post-processing device including a cover supported on the housing in an openable and closable manner, The moving mechanism includes: A motor; a ratchet gear that rotates forward and backward by transmitting the driving force of the motor; a drive force transmission unit that moves the binding processing unit to one side in the main scanning direction in conjunction with a forward rotation of the ratchet gear and moves the binding processing unit to the other side in the main scanning direction in conjunction with a reverse rotation of the ratchet gear; a rotation restricting member that is switchable between an allowable position in which the rotation restricting member is separated from the ratchet gear and allows forward and reverse rotation, and a restricting position in which the rotation restricting member is in contact with the ratchet gear and allows forward rotation but restricts reverse rotation, The post-processing device according to claim 1, wherein the rotation restricting member is brought into the permissive position in response to the cover being closed, and is brought into the restricting position in response to the cover being opened.

2. 2 . The post-processing device according to claim 1 , wherein the one side in the main scanning direction is a direction in which the binding processing section approaches the cover.

3. the moving mechanism includes a biasing member that biases the rotation restricting member toward the restricted position, The rotation restricting member is The movable member is brought into the allowing position against the biasing force of the biasing member by being brought into contact with the closed cover, 3. The post-processing device according to claim 1, wherein the post-processing device is moved away from the open cover and is placed in the restricted position by the biasing force of the biasing member.

4. an image forming device for forming an image on a medium; An image forming system comprising: a post-processing device according to claim 1 , which binds a plurality of media on which images have been formed by the image forming device.

Images