JP2575228B2 - Perforator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching device for forming a binding punch hole in a sheet.

<Prior Art> Conventionally, an electrostatic latent image formed on the surface of a photoreceptor is visualized, then transferred to a sheet and subjected to image processing. Then, in order to automatically form a binding punch hole in this sheet, as shown in FIG. 10, the sheet P on which the fixing process has been performed is discharged to the outside of the apparatus. There is an image forming apparatus in which a punching device X having a punch blade X1 and a punch die X2 is arranged (see Japanese Utility Model Laid-Open No. 63-193698).

In the punching device X, when the cam X3 arranged behind the punch blade X1 is rotated about the rotation axis X3a, the punch blade X1 is pushed out in the direction of the punch die X2 as shown by a dashed line in the figure. Thus, a punch hole is formed in the sheet P.

Also, in the punching device X, especially in the case of thick paper, paper dust or the like at the time of punching is caught, and the punch blade X1 cannot be retracted. When the image forming apparatus is stopped in a state where the punch X1 is pressed down by the cam X3 due to a paper jam, the guide plate Y1 on the side where the punch die X2 is disposed is illustrated in FIG. The paper transport unit Y is configured to be opened downward by being rotated downward as indicated by the two-dot chain line.

<Problems to be solved by the invention> However, in the above configuration, the guide plate is provided below the punching device X.
A large space for rotating the Y1 to perform the jam processing is required, and it is difficult to reduce the size of the image forming apparatus. In addition, during the jam processing, the image forming apparatus is located at a position much lower than the eye level of the user. In addition, since the paper transport unit Y must be looked up from below the outside of the image forming apparatus so as to look into the inside, it is difficult to perform a jam clearing operation.

Further, when paper dust is caught between the punch blade X1 and the punch die X2, it becomes difficult to open the guide plate Y1, and the jam processing may become more difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a punching device that can easily perform a jam processing operation, does not require a large space for the jam processing, and does not hinder miniaturization of an image forming apparatus. It is intended to provide.

<Means for Solving the Problems> In order to solve the above problems, a perforation device according to the present invention includes:
The punch blade pushing means is arranged inside a casing that covers the punching device, and the punch blade and the punch die are rotated around a rotation shaft provided in the casing, so that the punch blade pushing means and the punch die are moved along the paper transport direction. Are arranged on a unit that can be integrally pulled out from the casing.

<Operation> According to the punching device of the present invention having the above-described configuration, a unit including a punch blade and a punch die is rotated from a casing covering the punching device around a rotation shaft provided in the casing to form a sheet. Jamming outside the casing in a state where the contact between the punch blade pushing means provided on the casing side and the punch blade provided on the unit is released by releasing the punch blade along the conveying direction of the unit and the punch blade is released. Processing can be performed.

<Embodiment> Hereinafter, a punching device of the present invention will be described with reference to the drawings showing an embodiment.

FIG. 5 shows a copying machine as an image forming apparatus in which the punching device of the embodiment is incorporated. This copying machine has a casing 1 having an original placing plate 11 and an original presser 12 at the top.
Is provided with an optical system 2, an image processing unit 3, a first paper transport unit 4, a second paper transport unit 5, an intermediate tray 6, and a punching device 7.

The optical system 2 includes a light source 21, mirrors 22, 23, 24, a lens 25, and a mirror 26, and exposes a document (not shown) set on the document placing plate 11 by the light source 21, Reflect the reflected light from the original as indicated by the dashed line in the figure.
It is for guiding to the image processing unit 3 through 22, 23, 24, the lens 25 and the mirror 26.

The image processing unit 3 is configured by arranging a charging charger 32, a developing device 33, a transfer charger 34, a separation charger 35, and a cleaner 36 in this order around a photosensitive drum 31 rotating in one direction. . The image processing unit 3 forms an electrostatic latent image corresponding to the original image by guiding the reflected light from the original to the surface of the photosensitive drum 31 uniformly charged by the charging charger 32, After the electrostatic latent image is visualized into a toner image by the developing device 33, the toner image is transferred to the surface of the paper P by the transfer charger 34, and the paper P is separated from the surface of the photosensitive drum 31 by the separation charger 35. By collecting the toner remaining on the surface of the photosensitive drum 31 with the cleaner 36,
One cycle of the image processing is completed.

The first paper transport unit 4 includes paper feed rollers 41a, 41b, and 41c that feed paper P one by one from paper feed cassettes 13a and 13b or a stacking bypass 14 that is detachably mounted at a predetermined position of the casing 1. Roads 42a, 42b, 42c, registration rollers
43, a transport roller 44, a transport belt 45, a thermal fixing device 46, a transport roller 47, and a discharge roller 48. The second paper transport unit 5 is provided between the transport roller 47 and the discharge roller 48. And is connected to the registration roller 43 via the intermediate tray 6.

When the image processing is performed only once on the paper P, only the paper transport by the first paper transport unit 4 is performed, the image-processed paper P is discharged onto the receiving tray 15, and the paper P is When performing two or more image processing such as double-sided image formation and composite image formation, the switching pawl 49 is switched as shown by a dashed line in FIG. The sheet is sent to the sheet transport unit 5, temporarily stored in the intermediate tray 6, then led out to the image processing unit 3, and is again subjected to image processing.

In addition, the discharge rollers 48 of the first paper transport unit 4
Is provided separately from the drive system of the copying machine, is connected to an independent drive system, or is connected to the drive system of the copier through means such as an electromagnetic clutch to interrupt the rotation, When a punch hole is formed by the punching device 7, the sheet P
Is configured to be able to stop in a state of sandwiching.

The second sheet transport section 5 branches from the switching claw 49 and guides the sheet P to the intermediate tray 6, and guide paths 50 a, 50 b, 50.
c, the first half of the transport rollers 51a and 51b, and the guide path 50a
The guide paths 50d, 50B branch off from the portion of the switching claw 52 provided in the middle of the
e, the reversing portion including the transport roller 51c and the re-feed roller 53 disposed at one end of the intermediate tray 6 form the transport roller 54a,
The registration rollers 43 pass through 54b and 54c and the paper feed paths 55a, 55b and 55c.
And the latter half.

A sensor S for detecting the rear end of the sheet P is provided between the conveying roller 47 and the thermal fixing device 46 in the first sheet conveying section 4, and the sensor S detects the front end of the sheet P. Alternatively, at a point in time when the paper P is conveyed a predetermined distance after the trailing edge is detected, the discharge roller 48 stops, and a punch hole is formed near the rear edge of the paper P by the punching device 7. ing.

The sensor S has a function of detecting a paper jam in addition to the function of detecting the front end or the rear end of the paper P. That is, the sensor S is connected to the heat fixing device 46.
When the sheet P is sent out of FIG. 1, the arm S1 is tilted down as shown by a dashed line in FIG. 1 to detect the front end of the sheet P, or the sheet P passes and is indicated by a solid line in FIG. As shown, the arm S1 stands up again, and at this time, the rear end of the sheet P is detected. Then, the arm S1 of the sensor S once defeated
Is detected after the elapse of a predetermined time, and if the arm S1 is not upright, it is determined that the paper is jammed.

The punching device 7 is disposed between the switching claw 49 and the discharge roller 48 of the first paper transport unit 4, and is shown in FIGS.
As shown in FIGS. 9A to 9C, a pair of punch blades 72, 72 held vertically by a holder 71, and coil springs 73, 73 for holding the punch blades 72, 72 at an elevated position. The punch die 74 for introducing the punch blades 72 and 72 and the punch blades 72 and 72 are pushed downward to form punch holes in the paper P. And cams 75, 75 as punching blade pushing means, which are arranged at the rear in the forward and backward directions.

In addition, among the above-described parts, the holder 71, the punch blades 72, 72,
The coil springs 73, 73, and the punch die 74 are disposed below the punch die 74, and are formed of punch holes P1 punched by the punch blades 72, 72 (see FIG. 3 (c)).
The unit U is configured to be able to be integrally pulled out of the casing 1 by being rotated about the rotation axis U1 together with the collection box 76, the switching claw 49, and the discharge roller 48 for collecting .

As shown in FIGS. 3 (a) to 3 (c), the lower surface of the lower horizontal frame 71a also serves as the upper guide plate of the first paper transport unit 4, and the upper and lower horizontal frames 71a, 71b are provided. In addition, it is configured by a frame having a substantially U-shaped cross section in which an insertion hole through which the punch blade 72 is inserted is formed. Also, the lower horizontal frame 71a of the holder 71
A punch blade 72 is inserted through the upper surface, and a bush 71c on which a coil spring 73 is fitted is attached.
The entire lower surface of the horizontal frame 71a is made of a synthetic resin film or the like. It is installed in contact with it.

The punch blade 72 has a cutting edge 72b at the lower end, and is formed of a cylindrical body whose upper end is in contact with the cam 75. 71
c, the flange 72a and the bush 71c.
With the coil spring 73 interposed between the upper and lower horizontal frames
It is vertically movably inserted into the insertion holes of 71a and 71b, and is held at the ascending position by the coil spring 73.

The punch die 74 has through holes 74a, 74a (third holes) into which the punch blades 72, 72 are introduced, at positions corresponding to the punch blades 72, 72.
1 (a) to 1 (c), only one of which is arranged in a direction perpendicular to the paper surface is shown), and the first paper transport unit 4 is constituted by a plate body also serving as a lower guide plate. .

In addition, on the front surface of the unit U in which the above-described units are provided,
As shown in FIGS. 1 and 6, a window U2 in which a transparent plate made of a synthetic resin or the like is fitted is provided to check the amount of scraps in the collection box 76.

By the way, the window may be arranged on the front surface of the casing 1. In that case, the unit U interposed between the front plate of the casing 1 in which the window is formed and the collection box 76
In each member such as the side plate, a notch having the same size as the window may be provided.

The pair of cams 75, 75 have the above-described components provided in the unit U, but as shown in FIG.
Is provided on the casing 1 side by being attached to one of the rotating shafts 75a arranged in the first position. When the punching holes are formed, the rotating shaft 75a is rotated by the driving system of the copying machine, so that the third As shown in FIGS.
The punch blades 72 contact the upper ends of the punch blades 72
Is pressed down to form a punch hole in the paper P.

In the punching device 7, in order that the pressing force of the punch blade 72 by the cam 75 is efficiently applied in the moving direction of the punch blade 72 when the rotating shaft 75a is rotated, FIG. As shown in (a), the axis of the rotation shaft 75a is
It is shifted in the horizontal direction by the dimension α with respect to the axis of the punch blade 72.

Further, the pair of cams 75, 75 are provided with a pair of punch blades 72, 72.
In order to reduce the load on the rotating shaft 75a and the driving system by shifting the timing of forming the punch holes in the sheet P by
As shown by a solid line in FIG. 2 and a dashed line in FIG. 1, they are attached to the rotating shaft 75a with their phases shifted from each other.

Further, between the pair of cams 75, 75 of the rotating shaft 75a,
As shown in FIG. 2, a third cam 75 'is arranged at an intermediate phase between the cams 75, 75 on both sides so as to correspond to three punch holes of the United States standard. In order to form three punch holes in the sheet P by using the third cam 75 ', the holder 71 may be provided with three punch blades. Further, in order to form four or more punch holes in the paper P, it is sufficient to configure a rotary shaft having a corresponding number of cams and the same number of punch blades as the cams.

In the punching device 7 of this embodiment composed of the above-described parts, when paper powder or the like is pinched and locked, and a paper jam occurs, a locking claw R shown in FIG. , R and the engaging portion (not shown) provided on the casing 1 side are disengaged, and the unit U is rotated and pulled out of the casing 1, so that the cams 75 and 75 provided on the casing 1 Punch blades 72 provided in unit U
The punch blades 72, 72 are exposed on the upper surface of the unit U in a state where the contact with the punch blades 72, 72 is released by releasing the contact with the punch blades 72, 72. Processing can be performed.

Also, due to paper jam in other parts, cams 75, 75
When the copying machine is stopped in a state where the punch blades 72, 72 are pushed down, the unit U is similarly rotated to be pulled out of the casing 1, and the cam provided on the casing 1 is provided.
If the contact between the 75 and 75 and the punch blade provided in the unit U is released to make the punch blades 72 and 72 free, the subsequent jam processing becomes easy.

When processing the scraps in the collection box 76, the unit U may be rotated to take out the collection box 76 from the unit U.

As shown in FIGS. 4A and 4B, the punch L can be provided with a lever L for lifting the punch blade 72 upward when the punch blade 72 is locked.

The lever L in FIG. 4 (a) has the punch blade 72 at the center.
Is formed, and is attached to the upper horizontal frame 71b of the holder 71 so as to be rotatable around the rotation axis L2.When the lever L is rotated, The bulging portion 72c formed at the upper end of the punch blade 72 is connected to the through hole L1.
And is lifted upward by contact with the edge of

On the other hand, the lever L in FIG. 4 (b) has the same configuration as that in FIG. 4 (a) except that the center of rotation is the rotation axis L3 provided in the unit U. I have.

The punching device of the present invention is not limited to the above embodiment.

For example, a unit that can be pulled out of the casing 1 may be composed of a main unit U and a sub-unit U ′ as shown in FIG. 7 (a).

Of the two units, the main unit U has a holder 7.
1, punch blade 72, coil spring 73, punch die 74, switching claw 4
9, and the upper roller 48a of the pair of discharge rollers 48
Is arranged. The main unit U can be rotated about the rotation axis U3 and can be pulled out of the casing 1 integrally.

On the other hand, a collection box 76 and a discharge roller
The lower roller 48b is disposed. The sub-unit U 'can be pivoted about the pivot axis U1' and pulled out of the casing 1 integrally.

While the punch blade 72 is not pushed down by the cam 75, the rollers 48a, 48
In the case where the perforating device 7 processes a paper jam that is not related, such as when the copying machine is stopped because the paper P is sandwiched between b, or when processing the scraps accumulated in the collection box 76, FIG. As shown in b), if only the sub-unit U 'is rotated and pulled out of the casing 1, processing can be performed. When the scrap is processed, the collection box 76 may be taken out of the sub-unit U 'as shown by a dashed line in FIG.

On the other hand, if the paper powder or the like is pinched and locked, causing a paper jam, or if the copying machine stops in a state where the punch blade 72 is pushed down by the cam 75 due to paper jam in other parts. For example, in the case of a paper jam involving the punching device 7, the main unit U is rotated and pulled out from the casing 1 as shown in FIG. 7 (c). Then the cam
The cooperation between the punch blade 75 and the punch blade 72 is released, and the punch blade 72 becomes free and is exposed outside the casing 1, so that the punch blade 72 can be easily pulled up to perform jam processing. Can be.

Next, in the modified example of FIG. 8A, a main unit U and a sub-unit V that can be separately pulled out from the casing 1 are provided as described above.

The main unit U is provided with a holder 71, a punch blade 72, a coil spring 73, a punch die 74, and a switching claw 49. The main unit U can be rotated about the rotation axis U3 and can be pulled out of the casing 1 integrally.

The sub-unit V is provided with a pair of discharge rollers 48 and a collection box 76. The sub-unit V can be turned around the turning axis V1 and pulled out of the casing 1 integrally.

For example, in a case where the copying machine is stopped by the sheet P being pinched between the pair of discharge rollers 48 due to a sheet jam in another portion in a state where the punch blade 72 is not pushed down by the cam 75, the punching device is used. When a paper jam not related to 7 is to be processed, the paper P sandwiched between the discharge rollers 48 can be removed by rotating the sub-unit V and pulling it out of the casing 1.

Also, when processing the scrap P1 in the collection box 76, the collection box 76 can be taken out of the sub-unit V by rotating the sub-unit V and pulling it out of the casing 1.

On the other hand, when the punch blade 72 is locked by paper powder or the like and the punch blade 72 is locked, and the paper jam occurs, or when the punch blade 72 is pushed down by the cam 75, the copy machine is caused by the paper jam in other parts. In the case of a paper jam related to the perforation device 7 such as when stopped, the sub-unit V and the main unit U are rotated together and pulled out from the casing 1 as shown in FIG. 8 (b). Then, the cooperation between the cam 75 and the punch blade 72 is released, and the punch blade 72 enters a free state and is exposed outside the casing 1, so that the punch blade 72 is easily pulled up by, for example, pulling up. It can be performed.

Next, the unit U shown in FIG.
Punch blade 72, coil spring 73, punch die 74, collection box 76,
In addition, a discharge roller 48 is disposed, and as shown in FIG. 9 (b), the discharge roller 48 can be integrally pulled out from the casing 1 by being rotated about a rotation axis U4.

A window U5 is formed on the front surface of the unit U for confirming the amount of scraps in the collection box 76. When the scraps are processed, the collection box 76 is moved to the position shown in FIG. (B)
As shown by a dashed line in FIG.

The unit U is smaller than that shown in FIG. 1 because the switching claw 49 is provided on the casing 1 side, and has an advantage that the rotation operation becomes easier.

In each of the above embodiments and modifications, the cam is used as the punch blade pushing means. However, a solenoid or the like may be used.

The arrangement of the discharge roller, the punching device, the collection box, and the like on the unit U can be appropriately changed. Perforator 7
May be disposed in another casing which is externally attached to the casing 1 in which the optical system 2, the image forming section 3, the first and second sheet transport sections 4, 5 and the intermediate tray 6 are arranged. good.

Although the punching device of the illustrated embodiment is incorporated in a copying machine as an example of an image forming device, the punching device of the present invention can be incorporated in another image forming device such as a laser beam printer.

In addition, various design changes can be made without changing the gist of the present invention.

<Effect of the Invention> The punching device of the present invention is configured as described above, and rotates a unit including a punch blade and a punch die from a casing covering the punching device around a rotation shaft provided in the casing. Then, by pulling out along the paper transport direction, the punch blade pushing means provided on the casing side and the punch blade provided on the unit are released from contact with the punch blade, and the punch blade is released. Since the jam processing can be performed outside the casing, the jam processing operation is easy, and a large space is not required for the jam processing, so that the image forming apparatus is not reduced in size.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing the vicinity of a unit which is a main part of a copying machine incorporating an embodiment of the punching device of the present invention, and FIG. 2 shows a state in which the unit is rotated to expose the inside. 3 (a) to 3 (c) are cross-sectional views showing a procedure for forming a punch hole by the punching device of the above embodiment, and FIGS. 4 (a) and 4 (b) are punching devices, respectively. FIG. 5 is a schematic cross-sectional view showing the entire copying machine, FIG. 6 is a perspective view showing a state in which the unit is closed, and FIGS. 8 (a) and 8 (b) are cross-sectional views each showing a modified example of the unit and its rotating state.
Is a cross-sectional view showing another modification of the unit and its rotation state, respectively. FIGS. 9A and 9B are cross-sectional views showing still another modification of the unit and its rotation state, respectively. No.
FIG. 10 is a schematic sectional view showing a conventional perforation apparatus. U: unit, 7: punching device, 72: punch blade, 74: punch die, 75: cam (punch blade pushing means).

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Naofumi Miyake 1-2-28 Tamazo, Chuo-ku, Osaka-shi, Osaka Inside Mita Kogyo Co., Ltd. (56) References JP-A-63-278797 (JP, A) 63-7498 (JP, U) JP 49-10394 (JP, B1)

Claims (1)

(57) [Claims] A punch blade disposed to be able to advance and retreat with respect to a paper transport path; a punch die for introducing a punch blade disposed at a position facing the punch blade in the transport path; A punching blade extruding means for extruding in the direction of the punching device, wherein the punching blade extruding means is disposed inside a casing covering the punching device, By rotating the punch die about a rotation shaft provided on the casing, along the sheet conveyance direction,
A perforation device, which is arranged on a unit that can be integrally pulled out from a casing.