JPH10181992A - Intermittent driving gear comprising geneva mechanism and sheet after processor provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely stop a stapler device in a prescribed bin position, also relax a shock from external force and increase durability, in a sheet after processor preventing a shock sound generated between a prime drive member and a driven member of a geneva mechanism, when external force of shock or the like is applied against the geneva mechanism in its rotational direction, also to be provided with an intermittent driving gear comprising the geneva mechanism. SOLUTION: This intermittent driving gear is formed by a geneva mechanism comprising a prime drive member 61 connected to a drive source M2 to rotate at a fixed angular speed and a driven member 62 driven by the prime drive member 61 to intermittently rotate. Here, coaxially on the driven member 62 of the geneva mechanism or on a shaft of a driven wheel G4 transmitted with rotation from the driven member 62, a torque limiter 64 is provided, the intermittent driving gear comprises the geneva mechanism formed so as to absorb turning force from external force applied to the driven member 62 by the torque limiter 64.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermittent drive device comprising a Geneva mechanism, and a sheet post-processing device which is connected to an image forming apparatus such as a copying machine or a printer to collate and bind recording paper (recording sheets). The present invention relates to an intermittent drive device including a Geneva mechanism of a stapler device provided in the above-described document, and a sheet post-processing device including the intermittent drive device.

[0002]

2. Description of the Related Art In general, a device for transmitting an intermittent rotational motion from a driving member rotating at a constant speed to a driven member is called an intermittent driving device. This intermittent drive device is applied to an automatic machine in which rotation of a driven member is stopped for a specific rotation angle, time, and period during rotation of a driving member.
Therefore, appropriate conditions such as a stop position for transporting and stopping the transported object from a predetermined stop position, a posture of the transported object, a transport path, and a transport speed and acceleration of the object must be considered.

Of the intermittent rotation devices, mechanical devices include a Geneva mechanism, an intermittent gear device, a cam device, a ratchet device, a link device, and a device in which a gear or a chain is incorporated in a link. The Geneva mechanism uses a pin gear, and there are an external Geneva mechanism and an internal Geneva mechanism.

FIG. 7 is a plan view showing a circumscribed Geneva mechanism. In the figure, reference numeral 1 denotes a driving member (Geneva wheel) which is connected to a driving source and continuously rotates at a constant angular velocity, and 2 denotes a driven member (Geneva cloth) which intermittently rotates following the driving member (driving member) 1. The pin 1A on the driving member 1 slides in n (four in the drawing) radial grooves 2A of the driven member 2 so that the driven member 2 moves 3
The drive member 1 rotates by 60 ° / n (90 ° in the figure), and thereafter, the circular arc portion 1B on the outer periphery of the driving member 1 and the circular arc portion 2B on the outer periphery of the driven member 2 slide, so that the driving member 1 rotates continuously. However, the rotation of the driven member 2 is stopped.

[0005] Conventionally, a sheet post-processing apparatus connected to an image forming apparatus such as a copying machine or a printer has a plurality of bins arranged in multiple stages in the vertical direction, and a recorded bin discharged from the image forming apparatus. Are inserted one by one in each bin so that they are collated.

The distributing means for sequentially feeding the recording paper into each bin is, for example, a distributor which reciprocates up and down along the entrance side of each fixed bin. The distributor is sequentially connected to each bin to be collated. The recording paper that moves, stops, and is ejected from the image forming apparatus is fed into each of the bins.

The recording paper collated in each bin is bound by a stapler device which sequentially moves up and down to predetermined bin positions. Even when such a stapler device is driven intermittently, the intermittent drive device including the Geneva mechanism is used. For example, JP-A-6-92
060.

[0008]

In order to prevent an impact at the start of the start of the driven member 2 of the intermittent driving device comprising the Geneva mechanism, the pin 1A on the driving member 1 is inserted into the groove 2A of the driven member 2. The direction of movement of the pin 1A at the moment of entry must match the direction of the groove 2A.

When the stop of the driven member 2 is started, the pin 1
At the moment when A escapes from the groove 2A, when a rotational force is applied to the driven member (geneva cloth) 2 as an external force from the driven means in the rotation direction, the groove 2A of the driven member 2 and the driving member 1 When the upper pin 1A and the upper pin 1A are in a relationship position where they do not affect each other, the circular arc portion 1B on the outer periphery of the drive
And the arcuate portion 2B on the outer periphery of the driven member 2 collide violently in the sliding gap, generating an impact sound.

If the Geneva mechanism is used as it is as the drive transmission mechanism, each of these mechanisms has problems, such as a large change in acceleration and deceleration, resulting in a large noise due to impact and a short life.

SUMMARY OF THE INVENTION The first object of the present invention is to solve such a problem and to prevent noise caused by an impact in an intermittent drive device comprising a Geneva mechanism, and to prolong the life of the Geneva mechanism.

Also, a stapler apparatus which moves at a relatively high speed by an inexpensive motor is stopped reliably at a predetermined position, and a stapler apparatus having a durable drive transmission mechanism with little impact and noise is provided. Provision is the second objective.

[0013]

A first object of the present invention is to provide a Geneva mechanism comprising a driving member connected to a driving source and rotating at a constant angular velocity, and a driven member intermittently rotated following the driving member. In the intermittent drive device, a torque limiter is provided coaxially with a driven member of the Geneva mechanism, or on a shaft of a driven vehicle to which rotation is transmitted from the driven member, and a rotational force from an external force applied to the driven member, This is achieved by an intermittent drive device comprising a Geneva mechanism characterized by being absorbed by a torque limiter.

A second object of the present invention is to provide a plurality of vertically stacked bins for distributing and storing recording sheets carried out from the main body of the image forming apparatus, and to bind the recording sheets stored in the bins. A sheet post-processing apparatus comprising: a stapler device for stopping; and an intermittent drive device for driving the stapler device up and down to a position where the plurality of bins are arranged to stop the intermittent drive device. A Geneva mechanism comprising a driving member that rotates at a speed and a driven member that intermittently rotates following the driving member, wherein the Geneva mechanism is suspended by a wire member wound around a drum that rotates in conjunction with the driven member of the Geneva mechanism. The stapler device is intermittently driven up and down, and torque is applied coaxially with the driven member of the Geneva mechanism or on the shaft of a driven vehicle to which rotation is transmitted from the driven member. The provided limiter, the rotational force from an external force applied to the driven member, it is achieved by a sheet post-processing apparatus having an intermittent drive device being characterized in that so as to absorb by the torque limiter.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an intermittent drive device comprising a Geneva mechanism of the present invention and a sheet post-processing device provided with the intermittent drive device will be described with reference to the accompanying drawings.

FIG. 1 shows an image forming apparatus (for example, a copying machine) 10.
2 is a central cross-sectional view illustrating the configuration of the sheet post-processing apparatus 10 connected to the image forming apparatus 100, and FIG. 2 is a configuration diagram illustrating a combined state of the image forming apparatus 100 and the sheet post-processing apparatus 10. Note that the present invention is not limited to the present embodiment.

As shown in FIG. 1, a sheet post-processing apparatus 10
Is a conveyor belt 12 provided along the entrance side in a row of a plurality of bins (containers) 51a to 51n;
The distributor 21 is supported between the 1n rows so as to be able to reciprocate up and down.

That is, the bins 51a to 51n are attached to the housing 10c of the sheet post-processing apparatus 10 by means not shown in the drawing so that the bins 51a to 51n are mounted in a line at equal intervals as bins 51a, 51b, 51c to 51n in order from the top. 51
a, 51b, 51c to 51n (hereinafter collectively referred to as bins 51) receiving members 52a, 52b, 52c to receive rear ends thereof
52n, U-shaped guide grooves 53a, 53b, 53c to 5c
The front end receiving member 54 formed with 3n is provided on the housing 10c, and the transport belt 12 is suspended on the transport belt pulleys 13a and 13b as shown in the drawing, and rotates clockwise as indicated by an arrow when driven. .

The recording sheet (recording paper) P on which an image is formed by the image forming apparatus 100 is discharged from the sheet discharge port 100g of the image forming apparatus 100, and is immediately inserted from the sheet receiving port 10g of the sheet post-processing apparatus 10. That is, the recording paper P is guided by the transport rollers 14 and the guide plate 16 and is transported to the downward traveling portion on the right side of the transport belt 12.

The distributor 21 has a recording paper P receiving guide member 23a having a receiving opening 23 with a wide opening at the upper part, and is integrally attached to the distributor frame 22. At the other end of the receiving port 23, a discharge port 23b is provided, and a pair of discharge rollers 30 are arranged in a vertical direction by a driving means (not shown) so as to be adjacent to the discharge port 23b. The recording paper P is discharged onto the bin 51 in the direction of the arrow through the discharge port 23b.

In FIG. 1, both ends of one timing belt 28b are fixed forward and rearward at both ends in the longitudinal direction of the distributor frame 22 as shown in FIG. It is suspended so as to be pulled by a belt 28b. A timing belt 28a is suspended between a timing gear 29a attached to a shaft of a stepping motor M1 as a driving motor and a timing gear 29b which rotates integrally with a timing gear 29c of a driving gear of the timing belt 28b. The rotation shaft of the timing gear 29b (29c) is connected to the timing gear 29 of the timing belt 28b on the opposite side.
c so that the front and rear timing belts 28b can be driven integrally.

A positioning sensor (not shown) is provided at a position corresponding to each bin 51 so that the distributor 21 can be stopped. The stepping motor M1 is driven by the information of the positioning sensor to move the distributor 21 to each bin 51. To stop at a predetermined position.

The timing belt 28b is also suspended by a timing gear 29d in the upper part of the sheet post-processing device, and the timing gear 29d is coaxially connected to the wire winding pulley 27. Wire take-up pulley 27
The wire 24 passes through the pulleys 27 a and 27 b and the wire receiver 26, and the tip thereof is attached to one end of a wire spring 25, and the other end of the wire spring 25 is hooked on the rotation shaft of the discharge roller 30. The wire spring 25 is a spring for applying an appropriate tension to the wire 24.

Note that the fact that the other end of the wire spring 25 is hooked on the rotation shaft of the discharge roller 30 is not particularly meaningful, but merely that there is a shaft that is just right for the spring hook. This means that the other end of the wire spring 25 is hooked on the distributor frame 22.

In this way, when the distributor 21 is driven vertically by the stepping motor M1, the distributor 2
1 timing gear 29 rotated by the vertical drive
The wire winding pulley 27 having the same diameter as that of the wire d is rotated, so that the wire 24 is also wound or unwound on the wire winding pulley 27 while maintaining an appropriate tension. That is, regardless of the position of the bin 51 where the distributor 21 is driven by driving the distributor 21 in the vertical direction,
The tension on the wire 24 will be maintained properly.

Further, in FIG. 1, on the running side of the distributor 21 of the conveyor belt 12, a portion substantially at the center between the pulley shafts of the conveyor belt pulleys 13 a and 13 b of the conveyor belt 12 is lighter than the inside of the conveyor belt 12. The pressing roller unit 40 that presses with a load will be described.

In the pressing roller unit 40, the pressing roller 41 is supported by a U-shaped plate 42, and the supporting shaft of the U-shaped plate 42 is pressed against a base 44 attached to the sheet post-processing apparatus frame 10f. It is designed to be inserted with a spring 43 interposed therebetween. Although not shown, the rotation shaft of the pressing roller 41 is connected to the conveyor belt pulleys 13a and 13b.
The structure is such that parallelism is maintained with respect to the rotation axis.

FIG. 3 is a sectional view of the bin 51 for discharging paper.
FIG. 3 shows a specific mounting structure of the bin 51 described with reference to FIG. 1 to the sheet post-processing apparatus 10, and the bins 51a and 51b of the bin 51 shown in FIG. Things.

First, the rear ends of the bins 51a, 51b are connected to the frame bodies 10a, 10b provided on both sides of the sheet post-processing apparatus 10.
And a wall 511 formed at the rear end of the bottle 51a.
a and a receiving member 521a formed of a receiving plate 522a, the receiving plate 521a receiving the recording paper P so as to be able to slide in a direction perpendicular to the discharge direction of the recording paper P. Have been.

The guide pin 513a shown in FIGS.
Projecting from the wall portion 511a of the bottle 51a,
It is slidably fitted in the guide groove 523a formed in 2a. On the other hand, the distal end of the bin 51a is fitted into a U-shaped guide groove 53a of the distal end receiving member 54 as shown in FIGS. 1 and 3, and the guide groove 53a has a thickness and a length of the distal end of the bin 51a. , And a play width is provided as shown in the figure.

Similarly to the bin 51a, the bins 51b arranged at the bottom are in close contact with the respective surfaces of the wall 511b and the bottom 512b formed at the rear end, and are in a direction perpendicular to the direction in which the recording paper P is discharged. Receiving plate 521b received so as to be slidable,
A receiving member 52b formed by a receiving plate 522b is provided. The bottle 511 is also provided with a wall portion 511 similarly to the bottle 51a.
b has a guide pin 513b, and is slidably fitted in a guide groove 523b formed in the receiving member 52b.

On the other hand, similarly to the bottle 51a, the bottle 51b
3 is fitted into a U-shaped guide groove 53b provided below the guide groove 53a as shown in FIG. The guide groove 53b is also formed wider than the thickness and length of the tip of the bottle 51b, and has a play width as shown in the figure.

FIG. 4 is a plan view showing the paper discharging bin 51a and the stapler device 70.

The bottle 51a is connected to the receiving member 52a as described above.
And the guide groove 53 a of the tip receiving member 54.
Although not particularly described in FIG. 3, the guide groove 53 a is shown to be configured to hold the tip of the bin 51 a at two places, but may be provided at two or more places or a wide one in terms of performance, and is particularly limited. Not something.

As shown in FIG. 2, in order to bind a plurality of recording papers P stacked in each of the bins 51a to 51n, a guide member 71 erected on the side (front side of the paper) of each bin 51 is slidably slidable. A stapler device 70 that is connected and movable in the vertical direction is provided. This stapler device 7
Reference numeral 0 denotes a wire for a stapler device (hereinafter, referred to as an SP wire) wound on a wire wheel of a drive transmission mechanism (not shown) described later provided on the upper surface of the sheet post-processing device 10.
One end of 72 is connected via a plurality of pulleys 73, and the other end of the SP wire 72 is connected to a weight 74 as shown in the figure, so as to reduce the driving load when the stapler device 70 rises. Further, a moving device 75 for moving the bin 51 for performing the binding operation by the stapler device 70 is provided.

FIG. 5 is a side view showing the state of movement of the discharge bin 51a. FIG. 5 (a) shows the state before the movement of the bin 51a starts, and FIG. 5 (b) shows the state after the movement of the bin 51a. The state of is shown.

The moving device 75 is operated by a rotating member 76 which is rotated by a driving means. As shown in FIGS. 5A and 5B,
A protrusion 514 is formed on the side of the bin 51a.
14 is provided with a recording paper pressing arm 55a.
Is pivotally supported by a support shaft 56, and the recording paper pressing arm 55 a is provided by a spring 57 so as to be separated from the recording paper P. Further, a projection 58 is provided on a part of the recording paper pressing member 55. The pull-out arm 78 is engaged with the projection 58 to move the bin 51a to the left in the drawing against the urging force of the spring 79.

FIG. 1 shows the bin 51a constructed as described above.
As shown in (1), the recording paper P is discharged by the distributor 21 in page order, and the discharge is completed. Next, after the paper ejection is completed, the bin 51a
Paper aligning member (alignment rod) 82 penetrating through a long hole 81
And presses the recording paper P to the side of the bin 51a as shown in FIG. 4 to align the side edges of the recording paper P.

Next, in order to perform the binding operation of a plurality of recording papers P by the stapler device 70, the pivoting member 76 of the moving device 75 and the connecting rod 77 are attached to the pull-out arm 78 by the protrusion 58 of the recording paper pressing member 55. Lock as shown in FIG.
The rotation member 76 is rotated to move the protrusion 58 to the left in FIG. At this time, the recording paper pressing member 55 rotates against the spring 57, and presses the upper end of the recording paper P with the tip of the recording paper pressing arm 55a as shown in the drawing, thereby pressing the recording paper P against the bin 51a. Hold. Further, the bin 51a moves together with the recording paper P in the direction of the stapler 70 by rotating the rotating member 76 and moving it to the left in the drawing.

As shown in FIGS. 4, 5A and 5B, one end of a spring 79 is provided in the bin 51a, and the other end of the spring 79 is fixed to the main body of the sheet post-processing apparatus 10. When the bin 51a moves leftward in the figure, it moves against the elasticity of the spring 79. Further, as shown in FIG. 4, the spring 79 is provided at an angle of θ with respect to the moving direction, and is disposed so as to slightly press the bin 51a toward the receiving member 52a.

The rear end of the bottle 51a thus disposed is lightly pressed by the spring 79 onto the receiving plates 521a and 522a provided on the receiving member 52a.
When pulled out by the pull-out arm 78, the receiving plates 521a, 521
The wall portion 511a and the bottom portion 512a move while closely contacting the weight of the bin 51a with the 22a, and the recording paper P is accurately moved to the position of the stapler device 70. Therefore, the binding operation can be performed by the stapler device 70 at a predetermined position on the recording paper P.

On the other hand, the tip of the bin 51a is inserted into the U-shaped guide groove 53a, but is formed to be wider than the thickness and length of the tip of the bin 51a as described above. When moving against bending, the guide groove 5
There is no hindrance to movement within 3a.

After the stapler 70 completes the binding operation on the recording paper P, the pull-out arm 78 is separated from the projection 58, and the bin 51a is automatically returned to the original position by the return force of the spring 79. After the binding operation of the bin 51a is completed, the stapler device 70 moves to the next bin 51b,
The recording paper P is bound by the same operation as described above.

Next, a drive transmission mechanism for driving the stapler device 70 of the present invention up and down will be described.

FIG. 6A is a plan view showing the structure of the drive transmission mechanism of the stapler 70, and FIG. 6B is a side view of the drive transmission mechanism.

As shown in FIG. 6, the drive transmission mechanism 60
A driving motor G2, which is a driving source, and a driving gear G2 that meshes with a worm gear G1 fixed to a driving shaft of the motor M2
And a protrusion 2 provided integrally with the drive side gear G2.
A driving member (driving member, Geneva wheel) 61 having the pin 61a and the arc portion 61b, a driven member (Geneva cloth) 62 engaging with the pin 61a and the arc portion 61b of the driving member 61, and the driven member 62 The gear G3 and the wire wheel 63 provided coaxially with the center of rotation of the SP, the SP wire 72 wound around the wire wheel 63, and the SP
Pulley 73 around which one end of the wire 72 is wound, and the gear G
3 and a torque limiter 64 provided coaxially with the rotation center of a gear (driven wheel) G4 meshed with the gear 3.

One end of the SP wire 72 wound around the wire wheel 63 winds the pulley 73 and then suspends the stapler device 70. A weight 74 is suspended from the other end of the SP wire 72.

The driven member (geneva cloth) 62 has four radially extending long grooves 62a which engage with the two pins 61a, and is provided on both sides of each of the long grooves 62a. It comprises a circular arc portion 61b and a concave circular arc portion 62b formed by a circular arc having the same curvature.

A driving member 61 comprising the pin 61a and the arc portion 61b as described above, a long groove portion 62a and an arc portion 62b
A drive mechanism having a driven member composed of the following and transmitting continuous rotation to intermittent rotation is generally called a Geneva mechanism.

The sheet post-processing apparatus provided with the intermittent drive device comprising the Geneva mechanism according to the present invention includes a motor M2 and a motor M2 in order from the right side as shown in FIG. Driving member (drive member) 61, driven member 6
2. A torque limiter 64 is provided. The driving force is transmitted to the front stage of the Geneva mechanism by gears G1 and G2,
The driving force is transmitted to the rear stage of the Geneva mechanism by the gears G3 and G4.

The wire wheel 63 intermittently rotated by the Geneva mechanism intermittently moves the stapler device 70 up and down via the pulley 73 by the SP wire 72.

The driven member 62 of the Geneva mechanism is provided with four long grooves 62a radially formed with a width and a predetermined depth which divide the circumference into four equal parts and engage with the pins 61a. At the same time, on both sides of the long groove portion 62a, there are provided arc portions 62b formed of concentric arcs having the same curvature as the arc portion 61b of the driving member (driving member) 61. This arc 6
When 2b faces the arc portion 61b, the movement of the driven member 62 in the rotation direction is stopped by the arc portion 61b.
The driven member 62 to which the rotation is transmitted by the pin 61a rotates 90 ° while the long groove 62a and the pin 61a start engaging with each other and are separated from the long groove 62a, and then the connection with the drive member 61 is established. It is cut off and becomes free and stops. Accordingly, the position shown in FIG. 6 where the arc portions 61b and 62b stop is the home position of the drive transmission mechanism 60.

The rotation ratio is set so that when the driving member 61 makes a 1/2 rotation, the driven member 62 makes a 1/4 rotation.
The stapler device 70 is moved up and down to the next adjacent bin 51 by feeding out or winding up the SP wire 72 wound around 3. The SP wire 72 is wound counterclockwise in the counterclockwise direction on the wire wheel 63. The SP wire 72 is wound by the counterclockwise rotation of the wire wheel 63, and the pulley is pulled to the tip of the wire 72 located on the left side. The stapler device 70 connected via 73 rises. Conversely, when the wire wheel 63 rotates clockwise, the SP wire 72 is drawn out to lower the stapler device 70. Therefore, the amount of movement of the SP wire 72 involved in the quarter rotation of the driven member 62 is the amount of movement of one step corresponding to each bin 51 of the stapler device 70.

In the drive transmission mechanism 60 configured as described above, when the driven member 62 starts to stop, immediately after the pin 61a escapes from the long groove portion 62a, the pin 61a on the drive member 61 is in a relational position where the pin 61a does not affect each other. Then, a rotational force is applied from the driven means such as the stapler device 70 to the driven member (geneva cloth) 62 via the SP wire 72 and the wire wheel 63 as an external force F due to an impact in the rotational direction. And the torque limiter 64 gear-connected to the driven member 62 causes the external force F
And does not transmit the rotation to the driven member 62. Therefore, the circular arc portion 61b on the outer periphery of the driving member 61 and the circular arc portion 62b on the outer periphery of the driven member 62 do not violently collide with each other in the sliding gap to generate an impact sound.

As described above, by providing the drive transmission mechanism 60 with the torque limiter 64, the driving member 61 is provided.
Immediately after the pin 61a of the driven member 62 escapes from the long groove 62a of the driven member 62, that is, at the end of the intermittent rotation of the driven member 62, SP
When the stapler 70 connected to the wire 72 is subjected to an impact due to the external force F, the torque limiter 64 absorbs the external force F, and the driven member 62 significantly reduces the impact, thereby preventing noise. It is extremely excellent in durability.

In the embodiment shown in FIG.
The torque limiter 64 is mounted in a gear (driven wheel) G4 meshing with the gear G3, but the present invention is not limited to this, and the torque limiter 64 is mounted in the wire wheel 63. It is also possible. Alternatively, it is also possible to mount a torque limiter 64 in a rotating shaft where the driven member 62 and the wire wheel 63 are integrated.

[0057]

In the intermittent drive device comprising the Geneva mechanism according to the first aspect of the present invention, when an impact force is applied to the Geneva mechanism in the rotation direction, the torque limiter absorbs an external force, and the torque limiter absorbs the external force. Since the impact force is reduced, it is possible to prevent the driving member (Geneva wheel) and the driven member (Geneva cloth) from violently colliding with each other in the sliding gap to generate an impact sound.

Further, by means of a sheet post-processing apparatus provided with an intermittent driving device comprising a Geneva mechanism according to claim 2 of the present invention, an SP wire,
When a rotational force is applied to the Geneva mechanism via a wire wheel as an external force due to an impact in the rotational direction,
Since the torque limiter does not absorb the rotational force due to the external force and does not transmit the impact to the Geneva mechanism, the impact noise generated in the sliding gap between the driving member and the driven member of the Geneva mechanism is eliminated.

[Brief description of the drawings]

FIG. 1 is a central cross-sectional view illustrating a configuration of a sheet post-processing apparatus connected to an image forming apparatus main body.

FIG. 2 is a configuration diagram illustrating a combined state of an image forming apparatus and a sheet post-processing apparatus.

FIG. 3 is a cross-sectional view of a paper discharge bin.

FIG. 4 is a plan view showing a paper discharge bin and a stapler device.

FIG. 5 is a side view illustrating a movement state of a paper discharge bin.

FIG. 6 is a plan view and a side view showing a configuration of a drive transmission mechanism of the stapler device.

FIG. 7 is a plan view of a circumscribed Geneva mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Sheet post-processing apparatus 12 Conveyor belt 21 Distributor 51, 51a, 51b-51n Bin 60 Drive transmission mechanism 61 Drive member (drive member, Geneva wheel) 61a Pin 61b Arc part (notched cylindrical part) 62 Follower member (Geneva cloth) 62a long groove portion 62b arc portion 63 wire wheel 64 torque limiter 70 stapler device 72 wire for stapler device (SP wire) 73 pulley M1 stepping motor M2 DC motor (drive source) P recording sheet (recording paper)

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Kazuhiro Hirota 2970 Ishikawacho, Hachioji-shi, Tokyo Konica Corporation

Claims (2)

[Claims] 1. An intermittent drive device having a Geneva mechanism comprising a driving member connected to a driving source and rotating at a constant angular velocity, and a driven member intermittently rotating following the driving member, wherein the driven member of the Geneva mechanism comprises: A torque limiter is provided coaxially or on a shaft of a driven vehicle to which rotation is transmitted from the driven member, and a rotational force from an external force applied to the driven member,
An intermittent drive device comprising a Geneva mechanism, wherein the intermittent drive device is configured to absorb the torque by the torque limiter. 2. A plurality of vertically stacked bins for distributing and storing recording sheets carried out from an image forming apparatus main body, a stapler device for binding and stopping the recording sheets stored in the bins, and the stapler. A sheet post-processing apparatus comprising: an intermittent driving device that drives the device up and down to a position where the plurality of bins are arranged and stops the intermittent driving device; wherein the intermittent driving device is connected to a driving source and rotates at a constant angular velocity; A Geneva mechanism comprising a driven member that intermittently rotates following the driving member, and intermittently drives the stapler apparatus suspended by a wire member wound around a drum that rotates in conjunction with the driven member of the Geneva mechanism. A torque limiter provided coaxially with a driven member of the Geneva mechanism or on a shaft of a driven vehicle to which rotation is transmitted from the driven member; Sheet post-processing apparatus having an intermittent drive device, characterized in that the rotational force from an external force applied to the wood, and to be absorbed by the torque limiter.