JPH05162919A - Punch unit - Google Patents

Abstract

PURPOSE:To provide a punch unit which can make a hole in a designated position without irregulation suitably matching recording sheets of various sizes and can be installed in the discharge side of a copying machine or a sorter by reducing its size. CONSTITUTION:A rotary click stopper 32 is provided on the driven side shaft 43 of driving and driven side discharge rollers 35, 34, and a boring means 30 is disposed in the upstream close position of the rotary click stopper. A driving shaft 45 for supporting the driving side discharge roller and the boring means are alternatively driven by the same motor 50, whereby after the leading end portion of a recording sheet transported from an external device is stopped by the stopper, a hole is made in the leading end part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a punch unit device for automatically forming punched holes on a recording sheet of recorded paper discharged from a copying machine or the like.

[0002]

2. Description of the Related Art A unit for performing post-processing such as punching holes on a recording paper or a bundle of recording papers discharged from an image forming apparatus such as a copying machine is a recording paper discharge port or sorter discharge side of an image forming apparatus body. The punch is dropped into a proper position on the recording paper to punch the recording paper while the leading end of the discharged recording paper is stopped.

FIG. 5 is an explanatory view of the structure of a conventional punching device. In a transport path consisting of upper and lower guides 1 and 2, from the upstream side, a pair of transport rollers 3, a punching device 4, a punch discharge roller 5, and a recording paper stop. The device 6 and the punch exit roller pair 7 are sequentially arranged. The punching device 4 punches the trailing edge of the recording paper by vertically moving the spring punch 11 via a link connected to the rod 10a of the solenoid 10, and the recording paper stopping device 6 operates the norenoid 14 via the link 13. By doing so, the punch register 15 is reciprocated between the dotted line position and the solid line position, and when the punch register 15 is at the dotted line position, it abuts against the leading edge of the recording paper and stops it.

However, in the conventional method, since the punching device 4 and the punch register 15 are operated by separate solenoids, respectively, there is a risk that the device becomes large and complicated and the cost increases, and the leading edge of the recording paper is punched. Since the punch 11 of the punching device 4 which is in contact with 15 and is spaced from the punching hole punches the trailing edge of the recording paper, it is difficult to deal with various sizes of recording paper.
Improvements in these points have been desired.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and it is possible to appropriately punch recording paper of various sizes at a predetermined position without variation, and moreover, by making the apparatus compact, copying is possible. It is an object of the present invention to provide a punch unit device that can be easily installed on the discharge side of a machine or a sorter.

[0006]

To achieve the above object, the present invention relates to a punch unit device for temporarily stopping and punching a recording paper discharged from an external device in the process of conveying the recording paper, wherein the punch unit device outputs a single motor. A piercing means side driving force transmission mechanism and a rotary claw stopper side driving force transmission mechanism, which are respectively connected to the shafts; and a first one-way clutch that operates the piercing means side driving force transmission mechanism when the output shaft rotates in the normal direction. ,
A second one-way clutch that operates the driving force transmission mechanism on the rotary claw stopper side when the output shaft reverses, and a second one-way clutch that operates when the driving force transmission mechanism on the punching means side operates to punch the recording paper on the transport path. The punching means, a rotary claw stopper that is activated when the rotary claw stopper side driving force transmission mechanism is activated, and rotates between a position for stopping the recording paper and a retracted position, and the rotary claw stopper is pivotally supported. A driven-side discharge roller that is loosely fitted on the stopper shaft coaxially with the rotary pawl stopper;
A drive side discharge roller that is driven by being connected to the rotary claw stopper side drive force transmission mechanism and that is in contact with the driven side discharge roller on the outer peripheral surface and rotates together with the driven side discharge roller; and a drive shaft that pivotally supports the drive side discharge roller. A clutch that is interposed between the stopper shaft and turns ON / OFF the transmission of the driving force from the drive shaft to the stopper shaft, a clutch operating means that turns the clutch ON / OFF, and an operation of the motor and the clutch operating means. The punch unit device is provided with a moving mechanism for moving the respective components forward and backward in a direction orthogonal to the recording paper conveyance direction.

The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a side view showing a state in which the punch unit device of the present invention is incorporated into an external device such as an image forming apparatus.
The recording paper discharged from the discharge roller provided in 1 is fed into the punch unit device 25 to be perforated. Figure 2 (a)
6B and 6B are a front view and a side vertical sectional view showing the internal structure of the punch unit device 25. The punch unit device 25 has a unit main body 27 and a moving mechanism 28 that supports the unit main body 27 so as to be capable of reciprocating in a direction orthogonal to the recording paper conveyance direction.

The unit main body 27 opposes each other at a predetermined interval, and upper and lower transfer guides 29a and 29b for transferring the recording paper within the interval, and a punching means 30 arranged in an opening of the upper transfer guide 29a. A rotary claw stopper 32 disposed close to the downstream side (left side in FIG. 2B) of the punching means 30.
The upper and lower discharge rollers 34 and 35, and the recording paper passage sensor (photo sensor) 3 arranged immediately upstream of the punching means 30.
7 and an eccentric cam 39 for operating the drilling means 30.
An eccentric cam shaft 40 that is rotatably supported by opposing side walls 41a and 41b of the casing 41 and fixedly supports the eccentric cam 39; and a casing parallel to the eccentric cam shaft 40 on the downstream side below the eccentric cam shaft 40. A stopper shaft 43 on the driven side, which is rotatably supported by the side wall of the body, fixedly supports the rotary claw stopper 32, and loosely fits the upper discharging roller 34 in the rotational direction, the upper discharging roller 34, and the outer periphery. A drive shaft 45 for fixedly supporting the shaft center of the lower discharge roller 35 for contacting the surface with each other and transmitting the drive force thereto;
Side driving force transmission mechanism 52 and rotary claw stopper side driving force transmission mechanism that receive driving force from a stepping motor (or DC servo motor) 50 fixed to the side, and an output gear 50a fixed to the output shaft of the motor 50. 54
And a transmission gear 56 in which the shaft center is integrated with the other end of the drive shaft 45.
Has a gear portion that meshes with the gear portion of the stopper shaft 4
3 and a metal plate spring lock that engages or disengages at the tip end with a locked portion 58a that is a notch formed at an interval of 180 degrees on the flange outer peripheral surface of the spring clutch 58. A piece 60 (FIG. 4) and a solenoid 62 (= clutch operating means for supporting the base end of the lock piece 60 via a spring 61 and magnetically attracting or separating the middle portion of the lock piece.
(To the left of (a), near the spring clutch 58)
And a disk-shaped encoder 64 whose center is fixed to the other end of the eccentric cam shaft 40, and a sensor 65 such as a photo interrupter fixed to the housing for detecting a mark such as a slit provided in the encoder 64. ..

The punching means 30 is provided with a punch 70 having a punching blade at a lower end thereof, a case 71 for supporting the punch 70 in a vertically movable manner, and a punch 70 which is interposed between the case 71 and the punch 70 to constantly push the punch 70 upward ( It has a coil spring 72 or the like that elastically urges in the retreat direction). The punching means 30 are arranged at a predetermined interval in the direction orthogonal to the recording paper conveyance direction, and the eccentric cam 39 is arranged immediately above each punch 70. When the eccentric cam 39 is at the retracted angle as shown in FIG. 2 (b), the punch 70 is pushed up by the spring 72 and retracted, but when each cam makes 180 rotations and reaches the position shown in FIG. The punching blade at the leading end is pushed down to project into the recording paper conveyance path at the same time, and two holes are simultaneously punched in the recording paper in the path.

The punching means side driving force transmission mechanism 52 has a first one-way clutch (not shown) and has an output gear 50.
The intermediate gear (group) 75 meshed with a
The eccentric cam shaft 40 is rotated by engaging 5 with the input gear 40a of the eccentric cam shaft 40. The wineway clutch is configured to transmit the driving force only when the motor output shaft rotates normally.

Next, the driving force transmission mechanism 5 for the rotary claw stopper side
Reference numeral 4 includes an intermediate gear (group) 77 having a second one-way clutch (not shown) and meshing with the output gear 50a. The intermediate gear 77 is connected to the drive shaft 45 to rotate the drive shaft 45. The second wineway clutch is configured to transmit the driving force only when the motor output shaft reversely rotates.

When the motor 50 is rotated in the reverse direction to drive the rotary claw stopper side driving force transmission mechanism 54 side, the driven side discharge roller 34 is rotated by the drive side discharge roller 35, and the solenoid 62 is turned off to lock the lock piece 60. 4 When the spring clutch 58 is locked by projecting it to the position indicated by the solid line 4, the stopper shaft 43 is unlocked by the spring clutch 58 and the driving force from the transmission mechanism 54 (gear 56) is not transmitted to the shaft 43. On the contrary, when the solenoid 62 is turned on to retract the lock piece 60 to the position indicated by the dotted line to unlock the spring clutch, the clutch 58 moves the shaft 4
3 is locked and the driving force from the gear 56 is transmitted to the shaft 43.

The rotary claw stopper 32 is projected to the conveyance blocking position shown in FIG. 2B by a control signal from a control unit (not shown) which receives a detection signal from the sensor when the leading edge of the recording paper passes the sensor 37. And wait for the leading edge of the recording paper to contact. At this time, the cam 39 holds the punch 70 in the retracted position. After a lapse of a predetermined time after the leading edge of the recording paper has passed (after a lapse of time sufficient for the leading edge of the recording paper to come into contact with the claw portion 32a of the rotary claw stopper 32), the motor 50 causes the cam 39 to move by the control signal from the control unit. The punch 70 is rotated 180 degrees so that the punch 70 projects into the conveyance path to punch the recording paper. Before the punch 70 descends, the rotary claw stopper 32 may be rotated to the retracted position as shown in FIG. 3 so as not to prevent the perforated recording paper from moving in the discharge direction. You may evacuate. Since the driving force for rotating the rotary claw stopper 32 is transmitted through the rotary claw stopper side driving force transmission mechanism 54, in order to retract the rotary claw stopper 32 before punching as shown in FIG. It is necessary to temporarily rotate the motor forward normally before.

After perforation, the cam 39 rotates 180 degrees, and FIG.
Return to position (b). The rotation angle of the eccentric cam is detected by a detection unit including an encoder 64 and a sensor 65, and the control unit controls the rotation number (pulse number) of the motor based on the detection signal. At this time, since the motor is rotating in the normal direction, the driving force is transmitted only to the eccentric cam shaft side.

When the motor 50 is rotated in the reverse direction, the driving force is transmitted to the rotary claw stopper side, and the driving shaft 45 and the discharge roller 3
5 rotates in the discharge direction. If the solenoid 62 is operated during the reverse rotation of the motor to retract the locking piece 60 to the unlocked position shown by the dotted line, the spring clutch 58 locks on the stopper shaft 43 and the driving force from the gear 56 is applied to the shaft 43.
To rotate the rotation pawl stopper 32. When the solenoid 62 is deactivated, the lock piece 60 projects to the lock position shown by the solid line and engages with the locked portion 58a to lock the clutch 58, so that the clutch 58 idles the shaft 43. During this time as well, the driven-side discharge roller 34 is driven by the drive-side discharge 35, and conveys the recording paper perforated in the nip portion of both rollers in the discharge direction.

As shown in FIGS. 2 (a), (b), FIG. 5, etc., the moving mechanism 28 has its fixed side base 80 arranged below the unit main body 27 and side walls 80a and 80b of the base 80 so that both ends thereof are fixed. A guide shaft 82 that is supported and extends in a direction orthogonal to the recording paper conveyance direction and loosely fits a guided piece 41c protruding from the lower portion of the housing 41 of the unit body 27 to slidably support the unit body 27 in the same direction. And base 80
A pulley 86 that is rotatably supported by a bracket 84 that projects from the inner bottom surface, and a wire 89 that has both ends fixed to the bottom surface of the housing 41 and that is wound around the pulley 86.
, A motor 90 for driving the pulley 86, and a guide roller 9
2 and so on.

This moving mechanism 28 is provided with a moving mechanism 28 according to the size of each recording paper when the size of the recording paper to be conveyed in the width direction is different.
This is for moving the one punching means 30, 30 in the width direction so as to be positioned at the central portion of the recording paper. For example, in the case of the side reference that conveys the recording paper along one side wall,
By moving the punching means 30, 30 to the central portions of recording papers of different sizes, it is possible to always punch at a position equidistant from the central point of the leading edge of the recording papers.

As described above, in the present invention, the rotary claw stopper 32 is fixed coaxially with the driven-side discharge roller 34,
Moreover, the discharge roller 3 is provided at a position immediately downstream of the punching means 30.
4 is arranged, the recording paper front end is fixed to the rotary claw stopper 32.
By making a hole while abutting on the claw portion 32a of
Two holes can be punched at the same position (central portion) on recording papers of various sizes, and variations in punching position can be prevented. At the same time as the release of the rotary pawl stopper (clockwise rotation in FIG. 2B), the discharge roller pair 34,
Since 35 rotates in the discharge direction, quick perforation and discharge work can be realized as a whole. Further, the length in the carrying direction can be suppressed to a necessary minimum to realize compactness, and it can be incorporated in various image forming apparatuses. Further, the driving of the punching means 30, the discharge rollers 34 and 35, and the rotary claw stopper 32 is realized by a single motor 50, unlike the conventional plural solenoid systems, so that noise can be reduced.

[0019]

As described above, according to the present invention, recording paper of various sizes can be appropriately perforated at a predetermined position without variation, and the copying machine and sorter can be realized by downsizing the apparatus. It becomes easy to install it on the discharge side.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a punch unit device of the present invention is incorporated in an image forming apparatus.

2 (a) and 2 (b) are a front view and a side vertical sectional view showing the internal structure of the punch unit device.

FIG. 3 is a side vertical sectional view showing an operating state of the punching means.

FIG. 4 is an explanatory diagram showing a configuration of a solenoid that locks a spring clutch.

FIG. 5 is an explanatory diagram of a configuration of a conventional example.

[Explanation of symbols]

20 image forming apparatus main body, 12 discharge port, 25 punch unit device, 27 unit main body, 28 moving mechanism,
29a, 29b Transport guide, 30 Perforating means, 32
Rotating claw stopper, 32a Claw part, 34, 35 Vertical discharge roller, 37 Recording paper passage sensor (photo sensor), 3
9 eccentric cam, 40 eccentric cam shaft, 41 housing, 41a,
41b Side wall, 43 Stopper shaft, 45 Drive shaft, 50
Motor, 50a Output gear, 52 Perforation means side driving force transmission mechanism, 54 Rotating claw stopper side driving force transmission mechanism, 5
6 transmission gear, 58 spring clutch, 58a locked part, 60 metal plate spring lock piece, 61 spring, 6
2 solenoids, 64 encoders, 65 sensors, 7
0 punch, 71 case, 72 coil spring,
75 intermediate gear (group), 77 intermediate gear (group), 80
Fixed base, 82 guide shaft, 86 pulley, 90
motor,

Claims (2)

[Claims] 1. A punch unit device for temporarily stopping and punching a recording paper discharged from an external device in the process of transporting the recording paper, wherein the punch unit device is driven by a punching means connected to an output shaft of a single motor. A force transmission mechanism and a rotary claw stopper side driving force transmission mechanism; a first one-way clutch for operating the punching means side driving force transmission mechanism when the output shaft rotates forward; A second one-way clutch for actuating the rotary claw stopper side driving force transmission mechanism; and a punching means for actuating when the punching means side driving force transmission mechanism is actuated to punch a recording sheet on the conveyance path,
A rotary claw stopper that rotates when the drive force transmission mechanism on the rotary claw stopper side operates to rotate between a position for stopping the recording sheet and a retracted position, and a stopper shaft that pivotally supports the rotary claw stopper. The driven-side discharge roller loosely fitted coaxially with the rotary claw stopper is connected to and driven by the rotary claw stopper-side driving force transmission mechanism, and is driven by the outer peripheral surface of the driven-side discharge roller in contact with the driven-side discharge roller. Drive side discharge roller,
A clutch that is interposed between a drive shaft that pivotally supports the drive-side discharge roller and the stopper shaft to turn ON / OFF the transmission of the driving force from the drive shaft to the stopper shaft, and the clutch to turn ON / OFF.
A punch unit device, comprising: a clutch operating means for performing FF; a control unit for controlling the operation of the motor and the clutch operating means. 2. A punch unit device comprising a moving mechanism for moving each constituent element of claim 1 forward and backward in a direction orthogonal to a recording paper conveyance direction.