JPH03136799A - Punching device - Google Patents

Abstract

PURPOSE:To make jam treatment easy by arranging a punch edge extruding means inside a casing covering a punching device to unify a punch edge and a punch die so that they can be integrally drawn out of the casing. CONSTITUTION:By drawing an unit U including a punch edge 72 and a punch die 74 out of a casing covering a punching device 7, the contact of a punch edge extruding means (cam) 75 installed on the casing side with the punch edge 72 installed on the unit U is reset to make the punch edge 72 free. In such a state, jam treatment is made outside the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a punching device for forming punch holes in sheets for binding.

<Conventional technology> Conventionally, an electrostatic latent image formed on the surface of a photoreceptor is visualized and then transferred to paper for image processing, and the paper after the image processing is fixed by heating etc. In order to automatically form punch holes for binding on this paper after fixing it to the paper, as shown in FIG. Punch blade x1
There is an image forming apparatus in which a punching device X having a punch die X2 and a punch die X2 is arranged (see Japanese Utility Model Application Publication No. 83-193698).

In the above-mentioned punching device As a result, punch holes are formed in the paper P.

In addition, in the above-mentioned punching device If the image forming apparatus stops with the punch blade X1 being pushed down by the cam X3 due to a paper jam, in order to facilitate the jam removal, the guide plate Y1 on the side where the punch die X2 is arranged is Rotate downward as shown by the two-dot chain line in the center to remove the paper transport section Y.
It is structured so that the inside can be opened up.

<Problems to be Solved by the Invention> However, in the above configuration, the guide plate Y is placed below the punching device X.
1 requires a large space to rotate and clear the jam, which makes it difficult to downsize the image forming apparatus, and when clearing the jam, the machine is located at a position far lower than the user's eye level. Since the paper conveying section Y must be operated by looking up from below the outside of the image forming apparatus, as if looking into the inside, the jam removal work is difficult.

Furthermore, if paper dust is caught between the punch blade X1 and the punch die X2, it may be difficult to open the guide plate Y1, making it even more difficult to clear the jam.

The present invention has been made in view of the above circumstances, and provides a punching device that facilitates jam removal work, does not require a large space for jam removal, and does not hinder miniaturization of image forming apparatuses. is intended to provide.

Means for Solving the Problems> In order to solve the above problems, in the punching device of the present invention, the bunch blade extrusion means is arranged inside a casing that covers the punching device, and the punch blade and punch die are extruded from the casing. It is characterized by being integrated into a unit that can be pulled out.

According to the punching device of the present invention having the above configuration, by pulling out the unit including the punch blade and the punch die from the casing that covers the punching device, the punch blade extrusion means provided on the casing side; Jam removal can be performed outside the casing while the punch blade is released from contact with the punch blade provided in the unit.

<Example> Below, a punching device of the present invention will be described with reference to drawings showing examples.

FIG. 5 shows a copying machine as an image forming apparatus incorporating the punching device of the embodiment, and this copying machine includes a casing 1 having a document placement plate 11 and a document presser 12 on the top. It includes an optical system 2, an image processing section 3, a first paper transport section 4, a second paper transport section 5, an intermediate tray 6, and a punching device 7.

The optical system 2 is composed of a light source 21, mirrors 22, 23, 24, a lens 25, and a mirror 26, and uses the light source 21 to expose an original (not shown) set on the original placing plate 11, This is for guiding the reflected light from the original to the image processing section 3 through the mirror 22.degree. 23.24, the lens 25, and the mirror 26, as shown by the dotted chain line in the figure.

The image processing section 3 includes a charging charger 32, a developing device 33, a transfer charger 34, a separation charger 35, and a cleaner 36 arranged in this order around a photosensitive drum 31 that rotates in one direction. . In the image processing section 3, the charging charger 3
By guiding the reflected light from the original onto the surface of the photoreceptor drum 31, which is uniformly charged by 2, an electrostatic latent image corresponding to the original image is formed, and this electrostatic latent image is converted into a toner image by the developing device 33. After the toner image is transferred to the surface of the paper P by the transfer charger 34 and the paper P is peeled off from the surface of the photoreceptor drum 31 by the separation charger 35, the toner remaining on the surface of the photoreceptor drum 31 is removed. One cycle of image processing is completed by collecting it with the cleaner 36.

The first paper transport section 4 is a paper feed cassette 13a that is removably mounted at a predetermined position in the casing 1.

13b or the paper P from the cooking bypass 14.
Paper feed rollers 41a and 41b that feed sheets one by one.

41C1 is composed of paper feed paths 42a, 42b, 42c, registration rollers 43, transport rollers 44, transport belts 45, thermal fixing device 46, transport rollers 47, and discharge rollers 48, and the second paper transport section 5 , a switching claw 49 provided between the conveyance roller 47 and the discharge roller 48
It is connected to the registration roller 43 via the intermediate tray 6.

Then, when performing image processing only once on paper P,
Only paper transport is performed by the first paper transport section 4,
The receiver discharges the image-processed paper P onto the tray 15, and
When image processing is performed twice or more, such as double-sided image formation or composite image formation, the switching claw 49 is switched as shown by the dashed line in FIG. The paper is sent to the second paper conveyance section 5, temporarily stored in the intermediate tray 6, and then delivered to the image processing section 3, where it is subjected to image processing again.

Note that the ejection roller 48 of the first paper conveyance section 4 is
is connected to an independent drive system provided separately from the drive system of the copying machine, or is connected to the drive system of the copying machine via means for intermittent rotation, such as an electromagnetic clutch, When punching holes are formed by the punching device 7, the paper P
It is constructed so that it can be stopped with the

The second paper transport section 5 has guide paths 50a and 50b that branch from the switching claw 49 and guide the paper P to the intermediate tray 6.
, 50c, the first half consisting of transport rollers 51a and 51b, and the switching claw 52 provided in the middle of the guide path 50a branch, and after reversing the paper P, the intermediate tray 6
A reversing portion consisting of guide paths 50d, 50e, and conveyance rollers 51c leading to
4cs paper feed paths 55a, 55b, and 55c, and the latter half reaching the registration roller 43.

In the first paper transport section 4, a sensor S for detecting the trailing edge of the paper P is provided between the transport roller 47 and the heat fixing device 46.
is provided, and after the front edge or the rear edge of the paper P is detected by the sensor S, when the paper P is conveyed a predetermined distance, the discharge roller 48 stops and the punching device 7
As a result, punch holes are formed near the rear end of the paper P.

The sensor S has the 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 paper P is fed out, the arm S1 is either tilted down as shown by the dashed line in FIG. As shown, the arm S1 stands up again, and at this time the rear end of the paper P is detected. -The state of the arm S1 of the stripped sensor S is detected after a predetermined period of time, and the state of the arm S1 is detected.
If the paper is not upright, it is determined that there is a paper jam.

The perforation device 7 is disposed between the switching pawl 49 and the ejection roller 48 of the first paper conveying section 4, and as shown in FIGS. A pair of punch blades 72.72 held movably up and down by 71, a coil spring 73.73 that holds the punch blades 72.72 in the raised position, and a punch diameter 4 into which the punch blades 72.72 are introduced. In order to press down the punch blades 72 and 72 to form punch holes in the paper P, the punch blades 72.
A cam 75.75 is provided as a punch blade extrusion means, which is disposed above 2°72 (that is, at the rear of the punch blade 72.72 in the advancing and retreating direction).

Also, among the above parts, the holder 71, the punch blade 72.7
2, the coil springs 73, 73, and the punch diamond 4,
Punch blade 72 arranged below this punch diamond 4
．． 72 punched hole punching waste PL (
(See Figure 3 (C)) collection box 76, switching claw 49
It is configured as a unit U so that it can be pulled out from the casing 1 as a unit by being rotated about the rotation axis U1 together with the discharge roller 48 and the discharge roller 48.

As shown in FIG. 3 (ω to (C)), the holder 71 has a lower surface of a lower horizontal frame 71a that also serves as an upper guide plate of the first paper transport section 4, and is attached to the upper and lower horizontal frames 71a and 71b. , punch blade 72
It is composed of a frame body having a substantially U-shaped cross section and having an insertion hole through which it is inserted. In addition, a punch blade 72 is inserted into the upper surface of the lower horizontal frame 71a of this holder 71, and a bushing 71c on which a coil spring 73 is fitted is attached to the lower surface of the horizontal frame 71a. , the entire structure is made of a synthetic resin film or the like, and the paper presser F for guiding the paper P to the punch dia 4 when punch holes are formed is in a state in which the tip end is in elastic contact with the upper surface of the punch dia 4. It is attached with.

The punch blade 72 has a cutting edge 72b at the lower end, and is made of a cylindrical body whose upper end comes into contact with the cam 75.
and the bushing 71c, and the flange 7
A coil spring 73 is interposed between the bushing 71c and the bushing 71c, and is inserted into the insertion holes of the upper and lower horizontal frames 71a and 71b so as to be able to move up and down, and is held in the raised position by the coil spring 73.

The punch diameter 4 has a through hole 74 at a position corresponding to the punch blade 72.72, into which the punch blade 72.72 is introduced.
a, 74a (in FIGS. 3A to 3C, only one side arranged in the direction perpendicular to the paper surface is shown) is formed, and the plate body also serves as a lower guide plate of the first paper conveyance section 4. It is made up of.

Furthermore, as shown in Figs. 1 and 6, a transparent plate made of synthetic resin or the like is fitted onto the front surface of the unit U where the above-mentioned parts are installed, in order to check the amount of scraps in the collection box 76. A closed window U2 is provided.

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 on which the window is formed and the collection box 76
It is sufficient to provide a notch approximately the same size as the window in each member such as the side plate of the window.

The pair of cams 75.75 are attached to one rotating shaft 75a arranged in the casing 1, as shown in FIG. When punch holes are formed, the drive system of the copying machine rotates this rotating shaft 75a.
As shown in FIG. 3 (ω~(C)), by rotating the , the punch blade 72.72 comes into contact with the upper end of the punch blade 72. It is designed to be formed.

In addition, in the punching device 7, when the rotating shaft 75a is rotated, the pressing force of the punch blade 72 by the cam 75 is
In order to efficiently apply the force to the moving direction of the punch blade 72, as shown in FIG. It is shifted.

Further, the pair of cams 75.75 are connected to the pair of punch blades 7.
In order to reduce the load on the rotating shaft 75a and the drive system by shifting the timing of forming punch holes in the paper P according to 2.72, it is indicated by a solid line in FIG. 2 and a dashed-dotted line in FIG. 1. They are attached to the rotating shaft 75a with their phases shifted from each other.

Further, as shown in FIG. 2, a third cam 75' is provided between the pair of cams 75 and 75 of the rotating shaft 75a so as to correspond to the three punch holes of the American standard.
are arranged at an intermediate phase between the cams 75 and 75 on both sides. Using this third cam 75', paper P1;
In order to form one punch hole, 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 rotating shaft to which a corresponding number of cams are attached and the same number of punch blades as the cams.

In the perforating device 7 of this embodiment, which is made up of the above-mentioned parts, if a paper jam occurs due to jamming of foreign particles, etc., the lock claw R shown in FIG. . Then, the contact with the punch blade 72.72 provided in the unit U is released, and the punch blade 72.72
In the free state, the punch blades 72.72 are exposed on the upper surface of the unit U, so it is possible to clear the jam by, for example, pulling the punch blades 72.72 upward.

Also, due to paper jam in other parts, cam 75.7
If the copying machine stops with the punch blades 72.72 pressed down by 5, the unit U is rotated and pulled out of the casing 1, and the cams 75.75 provided in the casing 1 and the unit U are rotated and pulled out of the casing 1. If the punch blades 72 and 72 are released from contact with the punch blades provided in the punch blades 72 and 72, subsequent jam handling becomes easier.

Further, when processing the scraps in the collection box 76, the collection box 76 can be taken out from the uni-nod U by rotating the unit U.

Note that the punching device 7 may be provided with a lever L for lifting the punch blade 72 upward when the punch blade 72 is locked, as shown in FIG. 4 (mount A1).

FIG. 4 (The lever L shown in ω is in a state in which a through hole L1 through which the punch blade 72 is inserted is formed in the center, and it can be rotated around a rotation wheel L2 in the horizontal frame 71b on the upper side of the holder 71. When this lever L is rotated, the bulge 72c formed at the upper end of the punch blade 72
It is configured to come into contact with the edge of the through hole L1 and be lifted upward.

On the other hand, the lever L in FIG. 4 (in FIG. 4) has the same structure as that in FIG. 4 (al) above, except that the center of rotation is the rotation axis L3 provided in the unit U.

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

For example, a unit that can be pulled out from casing 1 is
As shown in FIG. 7, it may be composed of a main unit U and a sub-unit U'.

Of both units, the main unit U has a holder 71.
, a punch blade 72, a coil spring 73, a bunch dial 4, a switching pawl 49, and the upper roller 48a of the pair of discharge rollers 48. This main unit U is
It can be rotated around the rotation axis U3 and pulled out integrally from the casing 1.

On the other hand, a collection box 76 and a roller 48b below the discharge roller 48 are arranged in the sub-unit U'. This sub-unit U' can be rotated about the rotation axis Ul' and pulled out as a unit from the casing 1.

While the punch blade 72 is not pressed down by the cam 75, the roller 48 may
The seventh As shown in the drawing, processing can be carried out by rotating only the sub-unit U' and pulling it out from the casing 1. In addition, when processing the removed scraps, the collection box 76
can be taken out from the NU unit U' as shown by the dashed line in the figure.

On the other hand, if a paper jam occurs due to a lock caused by paper dust, etc., or if the copying machine stops with the punch blade 72 being pushed down by the cam 75 due to a paper jam in another part. 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 cooperation between the cam 75 and the punch blade 72 is released, and the punch blade 7
Since the punch blade 72 is free and exposed outside the casing 1, the jam can be easily cleared by, for example, pulling the punch blade 72 upward.

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

The main unit U is provided with a holder 71, a punch blade 72, a coil spring 73, a punch diamond 4, and a switching claw 49. The main unit U can be rotated around the rotation wheel U3 and pulled out as a unit from the casing 1.

The sub unit V includes a pair of discharge rollers 48 and a collection box 76.
and is provided. This sub-unit V has a rotation axis v1
It can be rotated around , and pulled out integrally from the casing 1.

For example, when the punch blade 72 is not pushed down by the cam 75 and the paper P is caught between a pair of ejection rollers 48 due to a paper jam in another part and the copying machine stops, the punching device When handling a paper jam that is not related to 7, by rotating the sub unit V and pulling it out from the casing 1, the paper P that is caught between the ejection rollers 48 can be removed.
can be removed.

Also, when processing the scraps P1 in the collection box 76,
By rotating this sub-unit V and pulling it out from the casing 1, the collection box 76 can be taken out from the sub-unit V.

On the other hand, if the bunch blade 72 is locked due to paper dust etc. being caught and a paper jam occurs, or the cam 75 causes the punch blade 72 to lock.
In the case of a paper jam related to the punching device 7, such as when the copying machine stops due to a paper jam in another part while the punching device 7 is pressed down, the secondary Both the unit V and the main unit U are rotated and pulled out from the casing 1. Then, the cam 75 and punch blade 72
Since the punch blade 72 becomes free and exposed outside the casing 1, jamming can be easily cleared by lifting the punch blade 72 upward.

Next, the unit U shown in FIG. 9(a) includes a holder 71,
A punch blade 72, a coil spring 73, a bunch dial 4, a collection box 76, and a discharge roller 48 are arranged.
As shown in FIG. 9), it can be pulled out integrally from the casing 1 by rotating about the rotation axis U4.

In addition, a window U5 is formed on the front surface of this unit U for checking the amount of scraps in the collection box 76, and when processing the scraps, the collection box 76 is (
b) - As shown by the dashed line, it is taken out from the unit U.

The unit U is smaller than the one shown in FIG. 1 because the switching claw 49 is provided on the casing 1 side, and has the advantage that it can be rotated more easily.

In each of the embodiments and modifications described above, the unit U is rotated about the rotation axis and pulled out from the casing 1, but it is also possible to move the unit in parallel on a rail and pull it out from the casing. It may be configured so that

In the illustrated embodiment, a cam is used as the punch blade pushing means, but a solenoid or the like may also be used.

The arrangement of the discharge roller, punching device, collection box, etc. on the unit U can be changed as appropriate.

The punching device 7 is arranged in a separate casing that is attached externally to the casing 1 in which the optical system 2, the image forming section 3, the first and second paper transport sections 4.5, the intermediate tray 6, etc. are arranged. You can leave it there.

The punching device of the embodiment shown in the figure was incorporated into a copying machine as an example of an image forming device, but the punching device of the present invention
It can be incorporated into other image forming devices such as laser beam printers.

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

<Effects of the Invention> The punching device of the present invention is configured as described above,
By pulling out the uni-soto including the punch blade and bunch die from the casing that covers the punching device, the bunch blade extrusion means provided on the casing side and the punch blade provided in the unit are released from contact and the punch blade is removed. Since the jam can be cleared outside the casing with the paper free, the jam clearing work is easy, and it does not require a large space for jam clearing and does not hinder the downsizing of the image forming device. becomes.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of 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 (aJ to (C) are respectively sectional views showing the procedure for forming bunch holes by the punching device of the above embodiment, and FIG. 4 (tabe is a modified example of the punching device). 5 is a schematic sectional view showing the entire copying machine, FIG. 6 is a perspective view showing the unit in a closed state, and FIGS. and a cross-sectional view showing its rotational state, FIG. 8(a) (bl is,
FIG. 9 is a cross-sectional view showing another modification of the unit and its rotational state, respectively.
The figure is a schematic cross-sectional view showing a conventional drilling device. U...Unit, 7...Punching device, 2...Punch blade, 74...Punch die, 75...Cam (punch blade extrusion means)

Claims (1)

[Claims] 1. A punch blade arranged to move forward and backward with respect to the paper conveyance path, a punch die for introducing the punch blade, placed at a position facing the punch blade in the conveyance path, and the punch blade directed in the direction of the punch die. In a punching device for forming punch holes in paper, the punching blade extrusion device is disposed inside a casing that covers the punching device, and the punch blade and punch die are extruded from the casing. A punching device characterized in that it is unitized so that it can be pulled out in one piece.