JP2001322094A - Punching device and image forming system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punching device and an image forming system using the punching device capable of positively preventing the edge part of a sheet from being caught in a hole of a punching means to cause a paper jam even if increasing the number of holes to be punched in the sheet such as paper. SOLUTION: In this punching device, a plurality of punching edges are arranged in a sheet conveying path at specified spaces in an orthogonal direction to a sheet conveying direction, and regulating members for regulating the position of a sheet are provided on both front and rear sides of the sheet with the sheet arranging path in between. Both regulating members are provided with through-holes for the punching edges to pass through, and a plurality of punching edges are projected and recessed from the sheet conveying path through the through-holes of both regulating members to punch a plurality of holes in the sheet. The periphery of the through-hole of at least one of the regulating members is recessed in a tapered state from the sheet conveying path to solve the problem.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching apparatus used for an image forming apparatus such as a copying machine, a laser printer, and a facsimile, and an image forming system using the punching apparatus.

[0002]

2. Description of the Related Art In recent years, in image forming apparatuses such as the above-described copying machines, laser printers, and facsimile machines,
There is a remarkable enrichment of post-processing apparatuses for performing punching processing, stapling processing, and the like, and added value is being improved by small-sized and multifunctional post-processing apparatuses. With regard to the drilling function in such a post-processing apparatus, a post-processing apparatus capable of performing online drilling of three holes, four holes, five holes, seven holes, etc. is required in addition to the conventional two-hole type. ing.

In the above-mentioned post-processing apparatus, perforating means corresponding to the number of holes to be perforated are arranged in a direction orthogonal to the sheet conveying direction. A desired number of holes, such as four holes, five holes, and seven holes, can be formed in a sheet.

[0004]

However, the prior art described above has the following problems. That is, in the above-mentioned conventional post-processing apparatus, the number of holes to be punched in the paper is reduced to two, three, four, five, seven, etc. A desired number of holes can be formed in a sheet. For this reason, in the post-processing device, for example, a sheet of various sizes is transported with reference to one end of the sheet in a direction orthogonal to the transport direction or the center of the sheet in the transport direction, and When the punching process is performed by the punching device, the edge portion of the sheet conveyed to the hole of the punching device may be caught and may cause a paper jam or may not be able to perform the punching process accurately at a predetermined position of the sheet. There was a problem.

In order to solve such a problem, a conventional two-hole type post-processing apparatus is disclosed in
As disclosed in Japanese Patent No. 49348, the punching means is configured to have a punching means of a type capable of moving in a direction orthogonal to the sheet conveying direction, and the edge of the sheet is not caught in the hole of the punching means. It is also conceivable to move the punch unit including the punching means to the position.

However, as the number of holes to be punched in a sheet increases to three holes, four holes, five holes, and seven holes,
It is difficult to move the punch unit to a position where the edge of the paper does not catch on the hole of the punching means. The processing apparatus becomes very large and is not practical, and as a result, there still remains a problem that the occurrence of paper jam cannot be reliably prevented.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to solve the problem even when the number of holes to be formed in a sheet such as paper is increased. An object of the present invention is to provide a perforation processing apparatus and an image forming system using the perforation processing apparatus, which can reliably prevent a sheet jam from being caught in a hole of a perforation unit and causing a paper jam.

[0008]

That is, according to the first aspect of the present invention, a plurality of perforation blades are arranged at predetermined intervals in a direction perpendicular to the sheet conveying direction in a sheet conveying path. On both the front and back sides of the sheet with the sheet conveyance path interposed therebetween, a regulating member for regulating the position of the sheet is provided, and a through-hole through which a punching blade penetrates the both regulating members is provided. By making the plurality of punching blades protrude and retract with respect to the sheet conveying path, in a punching processing apparatus for punching a plurality of holes in a sheet,
A perforation processing apparatus characterized in that the periphery of at least one of the through holes of the two regulating members is recessed from the sheet conveying path in a substantially tapered shape.

The two regulating members are configured such that at least one of the through holes is recessed from the sheet conveying path in a substantially tapered shape. Even if it is configured to be recessed from the sheet conveyance path in a substantially tapered shape, it is a matter of course that the periphery of both through holes of both regulating members may be configured to be recessed from the sheet conveyance path in a substantially tapered shape.

According to a second aspect of the present invention, there is provided a guide member for guiding a sheet to one of the two regulating members on a sheet conveying path on an upstream side around at least one through hole of the two regulating members. The perforation processing apparatus according to claim 1, further comprising:

Further, according to a third aspect of the present invention, the sheet conveying path located upstream of the punching blade is bent toward the punching blade. Processing device.

Still further, the invention described in claim 4 is:
In the vicinity of the upstream side of the perforation blade, a pair of conveyance members for conveying the sheet in a sandwiched state is provided, wherein the pair of conveyance members convey the sheet in a state where the leading end of the sheet is inclined toward the perforation blade. 2. The perforation processing apparatus according to claim 1, wherein:

Further, according to the invention described in claim 5, a plurality of perforation blades are arranged at predetermined intervals in a direction orthogonal to the sheet conveying direction on a sheet conveying path on which an image is formed. On both sides of the sheet across the sheet transport path,
A regulating member for regulating the position of the sheet is provided, and a through-hole through which the punching blade penetrates is provided in the both regulating members, and the plurality of perforating blades protrude and retract from the sheet conveying path through the through-holes of the regulating members. In the image forming system having a perforation processing device for perforating a plurality of holes in the sheet, the perforation processing device may be configured such that the periphery of at least one of the through-holes of the two regulating members is substantially tapered from the sheet conveyance path. An image forming system characterized by being depressed.

According to a sixth aspect of the present invention, there is provided the image forming system according to the fifth aspect, wherein a projection is provided in an upstream portion around at least one of the through holes of the two regulating members. .

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 3 shows a digital copying machine as an image forming apparatus to which a punching apparatus according to Embodiment 1 of the present invention can be applied.

In FIG. 3, reference numeral 1 denotes a main body of a digital copying machine. A scanner unit 3 for reading an image of an original 2
And the scanner unit 3
The upper part of the document has a function as a document pressing member for pressing a document 2 placed on a first platen glass 19, which will be described later, and an automatic conveying device for conveying the document 2 onto the second platen glass 10 at a constant speed. An automatic document feeder 4 having a document feed function is provided so as to be freely opened and closed with respect to the copying machine main body 1.

As shown in FIG. 4, the automatic document feeder 4 has a document set tray 5 on which a plurality of documents 2 to be copied are set with the copy side up. Are picked up in order from the top document by a nudger roll 5a and sent to a feed roll 6 and a retard roll 7. At the rear end of the feed roll 6 and the retard roll 7, a document feed sensor 28 for detecting a feed state of the document 2 is disposed. And
The original 2 is separated one by one by the feed roll 6 and the retard roll 7, and the plurality of take-away rolls 9 provided in the middle along the conveyance path 8 formed in a substantially arc shape. Platen glass 10
It is transported to the upper reading position. The document 2 transported to the reading position on the second platen glass 10 is
While the document is transported at a constant speed by the document transport roll 11 disposed above the second platen glass 10,
The image is read by an image reading element 13 such as a CCD via the scanning optical system 12 of the scanner unit 3 stopped at the position shown in FIG. The scanning optical system 12 includes an illumination lamp 14 for illuminating the original 2,
Full-rate mirror 15 for reflecting the reflected light image of the original illuminated by the light source, and two half-rate mirrors 1 for reflecting the light image from the full-rate mirror 15 so as to be folded back
6 and 17 and the optical image of the document 2 reflected by the half-rate mirrors 16 and 17
And an imaging lens 18 that forms an image in a reduced state.

When reading the image of the original 2 moving at a constant speed on the second platen glass 10 by the scanner unit 3, the full-rate mirror 15 is moved to the second platen glass as shown in FIG. The image of the document 2 is read in a state where the scanning optical system 12 is stopped so that the image is located at a reading position immediately below the position 10. When the scanner unit 3 reads an image of the original 2 placed on the first platen glass 19, the illumination lamp 14, the full-rate mirror 15, and the half-rate mirrors 16 and 17 move the original 2 By scanning along the lower surface at a speed ratio of 1: 1/2, the image of the original 2 is read.

Thereafter, the original 2 read at the reading position on the second platen glass 10 is a tri-roll 2 where the original transport roll 11 and the three rolls are pressed against each other.
0, the transport path is switched by the transport path switching member 21, so that the discharge rollers 22 provide the document discharge tray 2 provided below the document set tray 5.
3 is discharged.

When the automatic document feeder 4 performs double-sided copying of the document 2, the document 2 on which one side of the image has been read is transferred to the document discharge tray 23 by the discharge roll 22.
By switching the transport path by the transport path switching member 21 without directly discharging the original, the original 2 whose one-sided image has been read is temporarily stored in the original temporary storage section 25 below the original discharge tray 23 by the transport roll 24. , Manuscript 2
While the trailing end is held between the transport rolls 24, the transport rolls 24 are temporarily stopped. Next, the transport roll 2
When the document 2 is reversed, the document 2 is again conveyed to the conveyance path 8 via the conveyance path switching member 21 in a state where the document 2 is turned upside down, and the back side of the document 2 is conveyed to the reading position on the second platen glass 10. Then, the image is read by the image reading element 13 via the scanning optical system 12. After that, the original 2 from which the images on the front and back sides are read is switched by the transport path switching member 21 via the original transport roll 11 and the tri-roll 20, so that the transport roll 24 lowers the original set tray 23. The document is temporarily stored in the document temporary storage unit 25. The original 2 accommodated in the original temporary accommodation section 25 is rotated in a U-turn path by reversing the transport roll 24 while the rear end thereof is held between the transport rolls 24. The document 2 is discharged onto the discharge tray 23 through the document 26 with the surface of the document 2 facing down.

At the upper end of the digital copying machine body 1,
As described above, by placing the original 2 in a fixed state, the first platen glass 19 having a large area for reading an image of the original 2 and the original 2 are automatically conveyed at a constant speed. Meanwhile, a small second platen glass 10 for reading an image of the document 2 is arranged. As described above, the automatic document feeder 4 also having a function as a document pressing member is disposed above the digital copying machine main body 1 so as to be freely opened and closed. A document pressing member 27 made of an elastic member that presses the document 2 is provided at a position corresponding to the upper part of the first platen glass 19.

In the digital copying machine, as shown in FIG. 3, image information of the document 2 is read by the scanner unit 3 and the automatic document feeder 4 configured as described above. The image information of the document 2 read by the scanner unit 3 is stored in a temporary storage device (not shown), and after being subjected to predetermined image processing as necessary, according to the image information subjected to the image processing. ROS29 (Ras
Image output is performed on the photosensitive drum 30 by ter Output Scanner to form an electrostatic latent image. The surface of the photosensitive drum 30 is uniformly charged to a predetermined potential by a scorotron or a charging roll prior to image exposure. The electrostatic latent image formed on the photosensitive drum 30 is developed into a toner image by a developing device 31, and the toner image is transferred onto a copy sheet 33 by a transfer charger 32. This copy paper 33
Is supplied with paper of a predetermined size from a plurality of paper trays 34a, 34b, 34c, 34d housed in a lower part of the digital copier main body 1, and feed sensors 34a ', 34b', 34c ', 34d ', the sheet is once conveyed to a registration roll 36 in front of the photoconductor drum 30 by a plurality of conveyance rolls 35, and the photoconductor drum 3 is
The toner image is conveyed to the surface of the photosensitive drum 30 in synchronization with the toner image formed on the photosensitive drum 30.

The copy paper 33 onto which the toner image has been transferred from the photosensitive drum 30 is separated from the photosensitive drum 30 by a separation charger 37, and then conveyed by a conveying belt B to a fixing device 38, where the fixing device 38 At 38, the toner image is fixed on the copy paper 33 by heat and pressure, and is discharged onto the discharge tray T, thereby completing the image copying process.

The cleaning device C removes the remaining toner and paper dust from the surface of the photosensitive drum 30 after the toner image transfer process is completed, so that the surface is ready for the next copying process.

When duplex copying is performed by the digital copying machine, the copy path 33 having an image copied on one side is not discharged onto the discharge tray T as it is, but the transport path is switched to the sheet reversing path 39a. And once again conveyed to the image forming section below the photoreceptor drum 30 via the conveyance path 39b in a state where the front and back of the copy paper 33 are turned over, the image is copied on the back surface of the copy paper 33. Later, the copy paper 33 is discharged onto the discharge tray T.

The punching apparatus according to the first embodiment is used, for example, in combination with a digital copying machine configured as described above, and punches holes in a sheet of recording paper or the like on which an image is formed. It pierces. The perforation processing device is mounted as one of post-processing devices on the outside of a paper discharge unit of a digital copying machine, for example. Of course. Note that an image forming system is formed by the digital copying machine and the punching device.

Further, when punching is performed for each sheet in the punching apparatus, variations in the position in the width direction of the sheet and skew may cause the positional accuracy of the punch holes to deteriorate. Factors that cause variations and skew in the width direction of the sheet include paper feed cassettes 34a, 34b, 3
It is conceivable that the setting of the copy paper 33 on the transfer rolls 4c and 34d is shifted, the eccentricity of the transport roll 35 or the slip of the copy paper 33 or the like with respect to the transport roll 35. However, the degree of variation in the position in the width direction of the sheet and the degree of occurrence of skew vary depending on the structure, durability, and the like of the image forming apparatus. Even if no measures are taken, the accuracy of the position of the punched holes is of little concern.

Therefore, the perforation processing apparatus according to the first embodiment is applied to an image forming apparatus in which variations and skew in the width direction of the sheet are small. It is possible to cope with this by setting the hole diameter of the punch slightly larger as needed. However, in an image forming apparatus having a large variation or skew in the width direction of the sheet, it is necessary to use a perforation processing apparatus that copes with the variation or skew in the width direction of the sheet, as described in another embodiment described later.

FIGS. 1 and 2 are a sectional view and a plan view, respectively, showing a perforation treatment apparatus according to Embodiment 1 of the present invention.

1 and 2, reference numeral 40 denotes a main body of the punching apparatus.
Is mounted outside the digital copier body 1 as one of post-processing devices instead of the discharge tray T, for example. A first transport roll pair 42 and a second transport roll pair 43 for transporting a sheet 41 such as a copy sheet to the perforation processing apparatus main body 40 are provided on the front side of the perforation processing apparatus main body 40 in the sheet conveying direction. They are arranged parallel to each other. Further, behind the perforating apparatus main body 40 in the sheet conveying direction, a third sheet 41 which conveys the perforated sheet 41 as required by the perforating mechanism of the perforating apparatus to a discharge tray (not shown) or the like. Transport roll pair 44 is disposed. Then, the first, second and third transport roll pairs 4
2, 43, 44 are rotatably supported by fixed frames 45, 46 of a post-processing device including a punching device, and the transport rollers 42a, 43a, 44a on the driving side have their rotating shafts 42b, 43b, The drive motor 47, 48, 49 attached to the end of 44b is rotationally driven,
The sheet 41 is conveyed and stopped.

As shown in FIG. 1, the punching mechanism of the punching apparatus comprises a punch section 50 and a die section 51.
A slit-shaped sheet conveyance path 52 through which the sheet 41 conveyed by the first, second, and third conveyance roll pairs 42, 43, and 44 passes is formed between the punch unit 50 and the die unit 51. ing. As shown in FIGS. 1 and 2, the punch portions 50 are arranged at predetermined intervals corresponding to the intervals between the punch holes in a direction orthogonal to the conveying direction of the sheet 41, and have a rectangular side surface. Four frames 53
a, 53b, 54a, 54b and these four frames 5
Punch blades 55a, 55b, 56a, 56b attached to 3a, 53b, 54a, 54b, respectively, and each frame 5
Eccentric cams 57a, 57b, 58a, 58 rotatably disposed inside 3a, 53b, 54a, 54b, respectively.
b, a punch paper guide 59 forming a slit-shaped sheet conveyance path 52 through which the sheet 41 passes, and punch blades 55 a and 55 fixed on the punch paper guide 59.
guide members 60 for guiding the lower end portions of b, 56a, 56b
And a camshaft 61 to which the eccentric cams 57a, 57b, 58a, 58b are attached, a spring clutch 63 with a gear 62 attached to an end of the camshaft 61, and ON / OFF of the spring clutch 63. And a drive gear 65 fixed to the shaft of the punch motor 64 and transmitting drive force to the gear 62 of the spring clutch 63.

The punch portion paper guide 59 and the guide member 60 constitute a regulating member for regulating the front side of the sheet 41. The punch portion paper guide 59 and the guide member 60 have a punch blade 55a. , 55b, 56a, 5
Through holes 59a and 60a for penetrating 6b are formed. In addition, the said punching apparatus has four punch blades 5
5a, 55b, 56a, and 56b are provided, and four punch holes can be simultaneously punched in the sheet 41 by one punching process.

On the other hand, the die section 51 includes a die section paper guide 66 forming a slit-shaped sheet conveyance path 52 through which the sheet 41 passes, and punch blades 55a, 55b, 56a fixed to the die section paper guide 66. Dies 67 and 68 are provided at positions corresponding to 56b, respectively. The die portion paper guide 66 constitutes a regulating member for regulating the back side of the sheet 41. The die portion paper guide 66 includes punch blades 55a and 55
die 6 as a through hole through which b, 56a and 56b pass
7, 68 are respectively formed. The punch section 50
As shown in FIG. 5, the die portion 51 and the die portion 51 are integrally connected to each other by a connecting member 69 at a position wider than the sheet 41 having the largest size in the width direction running on the punching device.

In the punching apparatus configured as described above, when the punching process is not performed, the stopper in the spring clutch 63 is engaged, and even when the punch motor 64 is rotated, the cam shaft 61 does not rotate. At this time, punch blade 5
As shown in FIG.
9 is located above the slit-shaped sheet conveying path 52 without protruding therefrom. When performing the punching process, the stopper in the spring clutch 63 is released by a solenoid (not shown), and the cam shaft 61 is rotated by driving the punch motor 64. Then, the eccentric cams 57 and 58 rotate together with the cam shaft 61, and the eccentric cams 57 and 58 rotate.
Pushes down the punch blades 55a, 55b, 56a, 56b, penetrates the sheet 41 located between the punch part paper guide 59 and the die part paper guide 66, and enters the dies 67, 68 of the die part 51, as shown in FIG. Like sheet 4
1. Punch holes 70 and 71 are formed at predetermined positions. The operation up to this point is the half rotation of the camshaft 61. With the remaining half rotation, the punch blades 55 and 56 return to the upper standby position, and the stoppers are engaged, thereby stopping the rotation of the camshaft 61.

That is, in the punching apparatus, the cam shaft 61 rotates once by turning ON / OFF a solenoid (not shown) once, and the sheet 41 is punched. This perforation processing apparatus performs a punching process in a state where the sheet 41 is temporarily stopped between the punch portion paper guide 59 and the die portion paper guide 66.

As described above, the perforation processing apparatus is applied to an image forming apparatus in which the sheet 41 has a small variation or skew in the width direction. Can be dealt with by setting the diameters of the punch holes 70 and 71 slightly larger as necessary.

A digital copying machine to which the punching apparatus is applied forms an image with reference to the center of the photosensitive drum 30 in the axial direction, and forms a sheet 41 such as recording paper with reference to the center in the width direction. The so-called “center cash register” for transport
In the case where the system is adopted, if the variation or skew in the width direction of the sheet 41 is small, the punching device main body 40
As shown in FIG. 2, is fixedly arranged at a position where the center line in the width direction of each sheet 41 and the center lines of the punch blades 55 and 56 are aligned. In the case of the above digital copier, sheet 4
Regardless of the size of the sheet 1, the center position in the width direction of the sheet 41 is the same.

Therefore, in the punching apparatus, the sheet 41 is always conveyed with reference to the center line in the width direction irrespective of the size, and the punching holes 70 and 71 of the sheet 41 are also positioned at the center of the sheet 41 in the width direction. , And is always constant. Therefore, in the above-described perforation treatment device, it is not necessary to detect the end face of the sheet 41 in the width direction.
The end face (front end or rear end) of the sheet 41 in the conveyance direction is detected, and only the distance from the end face in the conveyance direction of the sheet 41 to which the punch holes 70 and 71 are to be punched is fixed or always fixed. It should just be decided. Therefore, in the above-described punching apparatus, as shown in FIGS. 1 and 2, the sheet transport direction end surface detection sensor 76 is located between the second transport roll pair 43 and the punch processing apparatus main body 40, and the punch blade 55,
56 (in the illustrated example, at the center position between the punch blades 55 and 56) on the sheet conveying path 52,
The sheet conveyance direction end surface detection sensor 76
For detecting the end face in the transport direction. As the paper conveyance direction end surface detection sensor 76, for example, a system that optically detects the end surface of the sheet 41 is used, but the present invention is not limited to this, and the end surface of the sheet 41 is detected by another system. Of course. At this time, the distance from the center of the punch blades 55, 56 to the detection position of the end face detection sensor 76 in the paper transport direction is Am
m. In the first embodiment, for example, the trailing edge of the sheet 41 is detected by the sheet-conveying-direction end-face detection sensor 76 and punching is performed on the rear end of the sheet 41. Of course, and the punching process may be performed on the leading end of the sheet 41.

By the way, in the perforation processing apparatus according to the first embodiment, a plurality of perforation blades are arranged at predetermined intervals in a direction perpendicular to the sheet conveying direction in the sheet conveying path. On both front and back sides of the sheet with both sides provided with regulating members for regulating the position of the sheet, and a through hole through which a punching blade penetrates both regulating members,
In a perforation processing apparatus that perforates a plurality of holes in a sheet by causing the plurality of perforation blades to protrude and retract from a sheet conveying path through the through holes of the both restriction members, at least one of the through holes of the both restriction members The periphery is formed to be substantially tapered from the sheet conveying path.

That is, in the perforation processing apparatus according to the first embodiment, as shown in FIG. Is configured to be depressed from the sheet conveying path 52. The guide member 60 attached to the punch portion paper guide 59 has a substantially tapered shape.
9 attached to the top. In addition, the periphery 59b of the through hole 59a of the punch part paper guide 59 is set so that the edge of the sheet 41 to be punched is not caught.
It is formed in a substantially tapered shape, and the inclination angle, the diameter of the tapered portion 59b, and the like are set as appropriate.

In the above configuration, in the punching processing apparatus according to the first embodiment, even if the number of holes to be punched in a sheet such as a sheet is increased, the hole of the sheet It is possible to reliably prevent the edge portion from being caught and causing a paper jam.

First, as shown in FIG. 2, a sheet 41 such as a recording sheet on which an image is formed by the digital copying machine is transferred to first and second transport roll pairs 42 and 43, and The sheet is conveyed to the perforation processing apparatus main body 40 at a predetermined conveying speed (a Bmm sheet is sent in 1 sec) by the second conveying roll pair 42 and 43. Now, sheet 41
Assuming that the distance from the rear end of the sheet 41 to the center of the punch holes 70 and 71 is X mm as shown in FIG.
When the sheet 41 is conveyed by (A−X) mm, the driving motor 49 of the third conveying roll pair 44 may be stopped to stop the sheet 41 and perform the punching process.

That is, in the above-described punching apparatus, the first,
The sheet 41 is transported by the second and third transport roll pairs 42, 43, and 44 at a transport speed of Bmm per second, and (Y / B) sec after the paper transport direction end surface detection sensor 76 detects the trailing edge of the paper. Thereafter, the motor 49 for driving the third transport roll pair 44 is stopped, and the sheet 4
1 is stopped, and the solenoid is operated as described above to perform the punching process.

In this embodiment, as shown in FIG. 1, the periphery 59b of the through hole 59a of the punch paper guide 59 located on the upper side of the sheet conveying path 52 is substantially tapered from the sheet conveying path 52. When the sheet 41 is transported by the first and second transport roll pairs 42 and 43, the edge portion of the sheet 41 is recessed from the sheet transport path 52 in a substantially tapered shape. Can smoothly pass through the periphery 59b of the through hole 59a formed in the through hole, and does not get caught on the periphery 59b of the through hole 59a, so that it is possible to reliably prevent paper jam from occurring. I have.

In the above case, the first, second and third transport roll pairs 42, 43 and 44 and the punching operation of the punching apparatus are controlled on the basis of time. 7, an encoder 78 having a slit 77 at an equal angle fixed to the rotation shaft 44b of the third transport roll pair 44, and a sensor 79 for detecting the slit 77 of the encoder 78, as shown in FIG. And a counter (not shown) for counting the number of slits 77 detected by the sensor 79 is provided, and the sheet feed amount of the third transport roll pair 44 corresponding to the angle of the adjacent slit 77 is C1 mm. The counter counts the number of slits 77 passing through the sensor 79 after the sheet conveyance direction end surface detection sensor 76 detects the rear end of the sheet 41, and the counter Count value is a roll drive motor 49 When turned (Y / C1) is stopped, it may be configured to perform the punching process.

When the roll drive motor 49 for transporting the sheet 41 is a stepping motor, and this stepping motor transports the sheet 41 by D1 mm in one pulse, the (Y / D)
1) Only after outputting a pulse, the roll drive motor 49
May be stopped (the output of the pulse is stopped) to perform the punching process.

After the punching process is performed in the punching apparatus as described above, the roll drive motor 49 is operated, and the sheet 41 on which the punch holes 70 and 71 are formed by the third transport roll pair 44 is shown again. Then, the sheet is discharged to a discharge tray or the like which is not to be used, and the punching operation ends.

When the leading edge of the sheet 41 is detected by the edge detecting sensor 76 in the sheet transport direction and punching is performed on the leading edge of the sheet, the punch hole 7
Assuming that the distance to the center of 0, 71 is X mm, when the sheet 41 is moved by Y = (A + X) mm from the detection of the leading edge of the sheet, the sheet 41 may be stopped and the punching process may be performed. After (Y / B) sec after the sensor 76 detects the leading edge of the sheet, the roll driving motors 47 and 48 may be stopped to perform the punching process. An encoder 78 having a slit 77 at an equal angle as shown in FIG. 7 and a sensor 7 for detecting the slit 77 are fixed to the rotating shaft 43b of the second transport roll pair 43.
9 and a counter for counting the number of slits 77 detected by the sensor 79, and the sheet transport amount of the second transport roll pair 43 corresponding to the angle of the adjacent slit 77 is C
If it is 2 mm, the counter counts the slit 77 from the detection of the leading edge of the sheet, and when the counter reaches (Y / C2), the roll driving motor 48 is stopped to perform the punching process. At this time, the roll drive motor 48 is a stepping motor and D2m in one pulse.
When the sheet 41 is fed by m, the detection of the leading edge of the sheet (Y / D
2) After the pulse output, the roll drive motor 48 is stopped (the output of the pulse is stopped), the sheet 41 is stopped, and the punching process is performed. At this time, the roll drive motor 48
The roller drive motor 47 is also stopped in synchronization with the stop of the operation. Then, after performing the punching process, the roll driving motors 47 and 48 are operated again to feed the sheet 41.

Further, in the first embodiment, the case where the positions where the punch holes 70 and 71 are formed at the front end or the rear end of the sheet 41 are fixed is described. , 71 may be arbitrarily changeable. In this case, an arbitrary distance X mm from the leading edge or the trailing edge of the sheet 41 to the center of the punch holes 70 and 71 is input on the operation panel of the image forming apparatus. Then, the value of Xmm input from the operation panel is converted into any of time, count number, and pulse number by the calculation means based on the calculation method, and the sheet 41 is conveyed based on these parameters. The first, second and third transport roll pairs 42, 43, and 44 may be stopped to perform the punching process.

As described above, in the first embodiment, the end face detection sensor 76 in the sheet conveyance direction is connected to the two punch blades 55.
And 56 are arranged on the sheet conveyance path corresponding to the central portion, so that even if the sheet 41 has a slight width variation or skew, the displacement of the punch holes 70 and 71 is suppressed to almost no problem. Can be.

That is, FIGS. 8 to 10 show that, when the position of the end face detecting sensor 76 in the sheet conveying direction is changed along the width direction of the sheet 41, if the sheet 41 has a slight skew, the skew is adjusted. 3 illustrates how the positions of the punch holes 70 and 71 of the sheet 41 vary.

FIG. 8 shows an end face detection sensor 76 in the paper transport direction.
Is placed at one end in the width direction of the sheet 41, and when the end face of the sheet 41 is detected by the sheet conveyance direction end face detection sensor 76 and punching is performed, the skew of the sheet 41 is reduced by a punch hole. It can be seen that the positional accuracy of 70 and 71 is greatly deteriorated. FIG. 9 shows a case in which the sheet conveyance direction end face detection sensor 76 is arranged so as to correspond to one of the punch holes 70. The accuracy of the punch hole 70 corresponding to the detection sensor 76 is good, but the accuracy of the other punch hole 71 is high. It turns out that is worse. FIG. 10 shows a state in which the sheet conveyance direction end face detection sensor 76 is connected to two punch holes 70 and 71.
In this case, the punch holes 70 and 71 have the best overall accuracy.

FIGS. 11 and 12 show modifications of the first embodiment.

FIG. 11 is not a large tapered concave portion of the punch portion paper guide 59 made of a thin sheet metal or the like. The thickness of the first member 59 'is also set to be small.

FIG. 12 does not depict a punch portion paper guide 59 made of a thin sheet metal or the like in a largely tapered shape, but instead protrudes a guide member 60 to the sheet conveying path 52 side. The sheet conveying path 52 is configured to be concave in a substantially tapered shape. In addition, the punch portion paper guide 59 is formed to be relatively thick.

Second Embodiment FIGS. 13 and 14 show a punching apparatus according to a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals. Then, in the perforation processing apparatus according to the second embodiment, the image forming apparatus to which the perforation processing apparatus is applied forms an image based on one end of the photosensitive drum 30 in the axial direction, and generates a copy sheet or the like. This is a so-called “side registration” type in which the image is formed by conveying the sheet 41 with one end in the width direction as a reference, and is applied to an apparatus in which the variation or skew in the width direction of the sheet 41 is small. In the case of the above-described punching apparatus, since the position of the center line in the width direction of each sheet 41 changes individually depending on the size of the sheet 41, the centers of the punch blades 55 and 56 are aligned with the center lines of the sheets 41 of each size. After that, it is necessary to perform a punching process. Note that, in the second and subsequent embodiments, only two punch blades are shown in the drawing and other punch blades are omitted, but as in the first embodiment, three or more punch blades are provided. Of course, it can be applied to the case.

Therefore, in the punching apparatus according to the second embodiment, the punching including the punch section 50 and the die section 51 as a punch mechanism is performed based on the size information in the width direction of the sheet 41 and the information on the presence or absence of the punch processing. Processing device body 40
Is moved along the width direction of the sheet 41 in accordance with the size of the sheet 41 or the like.

That is, in the above-described punching apparatus, FIG.
As shown in FIG. 5, as a moving means for moving the perforation processing apparatus main body 40 along the width direction of the sheet 41, a guide shaft 80 for supporting the perforation processing apparatus main body 40 movably along the width direction of the sheet 41, A rotatable guide shaft 82 in which a male screw portion 81 is threaded on a part for supporting the perforation processing device main body 40 movably along the width direction of the sheet 41, and a punch movement motor for rotating the guide shaft 82 83
A bearing 84 that slides on the outer periphery of the guide shaft 80 and is fixed to the punching apparatus main body 40;
A nut 85 screwed into the male screw portion 81 of the second and fixed to the punching apparatus main body 40;
And a bearing 86 that slides on a portion other than 1 and is fixed to the punching apparatus main body 40. The punching processing apparatus main body 40 moves rightward with respect to the sheet width direction when the punch moving motor 83 rotates in the normal direction, and moves leftward when rotating in the reverse direction.

When the punching device main body 40 is not operated, the punching device main body 40 is positioned at a position where a sheet 41 (which may be different from the maximum punchable size) in the width direction of the punching device can travel. That is, the punch blade 55,
The center line 56 stands by at the home position (first standby position) where it coincides with the center of the sheet 41 having the maximum punchable size (this width size is L1). The home position detection of the perforation processing apparatus main body 40 is performed by an actuator 86 fixed to the perforation processing apparatus main body 40 and a home position detection sensor 87 fixed to the fixed frame 46 side.
Done by This home position detection sensor 87
Is a sheet 4 having the maximum width.
The actuator 86 provided in the punching apparatus main body 40 is detected when it is at a position where it can be punched with respect to 1 (the position shown in FIG. 13). As shown in FIG. 15, the connecting member 69 connecting the punch portion 50 and the die portion 51 at the home position of the punching device main body 40 has a maximum size (punch size) of the sheet 41 traveling through the punching device in the width direction. (It may be different from the maximum possible size)
It is arranged at a wider position and is configured so as not to hinder the running of the seat 41 having the largest size in the width direction.

Further, the main body 40 of the perforation processing apparatus includes:
A second sheet conveyance direction end surface detection sensor 88 for detecting the end surface of the sheet 41 in the conveyance direction is provided at a position corresponding to the center of the two punch blades 55 and 56 and at the end on the second conveyance roll pair 43 side. The sheet-conveying-direction end surface detecting sensor 88 is movable along the width direction of the sheet 41 together with the perforation processing apparatus main body 40.

Incidentally, in the second embodiment, FIG.
As shown in FIG. 7, the punch portion paper guide 59 located above the sheet transport path 52 is formed of a thick plate material, and the punch portion paper guide 59 has a through hole 59a.
Of the sheet conveying path 52 is formed in a substantially tapered shape.

In the second embodiment, a guide member for guiding a sheet to one of the two regulating members is provided on the sheet conveying path on the upstream side around at least one of the through holes of the both regulating members. It is configured.

That is, in Embodiment 2, FIG.
As shown in FIG. 5, a thin plate-shaped guide member G made of a mylar film or the like is provided on the upstream side of the through holes 67 and 78 of the die section paper guide 66 facing the punch section paper guide 59 by means such as bonding. ing. The distal end portion G ′ of the thin plate-shaped guide member G is bent short upward toward the punch paper guide 59.

In the second embodiment, the edge of the sheet 41 can be reliably prevented from being caught in the through holes 67 and 78 of the die portion paper guide 66 by the thin plate-shaped guide member G. It has become.

FIG. 16 shows a modification of the second embodiment.

FIG. 16 shows that a thin plate-like guide member G made of a mylar film or the like is attached to the lower surface of the punch portion paper guide 59 by means such as adhesion. The front end portion G ′ of the guide member G is formed to be small and curved, so that the front end portion of the sheet 41 can be smoothly guided.

In the above configuration, the punching apparatus according to the second embodiment performs the punching process on the end face of the sheet as follows. First, in the above-described punching apparatus, when not in operation, as shown in FIGS. 13 and 15, a home position (first standby position) where the sheet 41 having the largest size in the width direction running on the punching apparatus can travel. ), The punch processing apparatus main body 40 waits.

Now, in the digital color image forming apparatus, the width size of the sheet 41 such as recording paper on which an image is formed is determined by the maximum size (L
If L2 is changed to L2 smaller than 1) and a punching signal is received according to the punching execution information, before the first sheet 41 is conveyed to the punching processing apparatus main body 40,
The punch processing apparatus main body 40 is moved from the home position by (L1 /
It moves to the second standby position moved by (2-L2 / 2) mm, and performs a centering operation of aligning the center of the sheet 41 with the centers of the two punch blades 55 and 56 of the punch processing apparatus main body 40. That is, the punch processing device main body 4
In the case where the width of the sheet 41 to be punched by L is 0 in the width direction L2, the punch processing apparatus main body 40 is moved from the center of the two punch blades 55 and 56 by (L1 / 2−L2 / 2) mm. In the width direction of the sheet is moved to the end side serving as a reference for sheet conveyance.

The operation after moving the punch processing apparatus main body 40 as described above is the same as that of the first embodiment. The sheet 41 is stopped after being transported by the predetermined amount Ymm in the transport direction, and Punch section 5 of processing apparatus main body 40
The punching process is performed on the rear end or the front end of the sheet 41 by the 0 and the die unit 51.

Thereafter, when the size of the sheet 41 to be punched in the width direction is also L2, the punching process may be continued by the punching apparatus main body 40 for the sequentially conveyed sheet 41. However, in the second standby position, as shown in FIG. 17, one coupling member 69 has moved to a position where the maximum width-direction sheet 40 traveling in the punch processing device main body 40 is prevented from traveling. Regardless of the paper size change information, when a punch-less signal is received from the punch processing execution information, before the next first sheet 41 is conveyed to the punch processing apparatus main body 40, the punch processing apparatus main body 40 As shown in FIG. 15, it returns to the home position.

On the other hand, in the second standby position, when L3 smaller than L2 as width size information of the sheet 41 and the presence of punch as punch processing execution information come,
Before 1 is conveyed to the punch processing apparatus main body 40, the punch processing apparatus main body 40 is further moved to the third standby position further moved by (L2 / 2−L3 / 2) mm, and the two punch blades 55, The center of the sheet 56 and the width direction of the sheet 41 are aligned. The subsequent operation is the same as that of the first embodiment,
Perform a punching process. At this time, in order to punch the punch holes 70 and 71 at a position at a predetermined distance X mm from the end face of the sheet 41, it is necessary to detect the end face of the sheet 41 with a detection sensor. Paper transport direction end face detection sensor 7 fixed to the road
6, or using any one of the sheet conveyance direction end face detection sensors 88 attached to the punch processing apparatus main body 40. However, as described above, the two punch blades 55, 56
Paper feed direction end face detection sensor 88 disposed at the center of
, The punch holes 70 and 71 can be formed with relatively high accuracy even for the skewed sheet 41. In this case, since the sheet conveyance direction end face detection sensor 88 is attached to the punch processing device main body 40, when performing punching on the rear end of the sheet 41, the stop position of the sheet 41 and the sheet conveyance direction end face detection are performed. It is also conceivable that there is little difference between the sensor 88 and the mounting position. Therefore, when a punch hole is always formed at a fixed distance X mm from the rear end of the sheet 41, the sheet conveyance direction end face detection sensor 88 is set at a distance X mm from the center of the two punch blades 55 and 56.
In the paper transport direction end face detection sensor 8
When the sheet 8 detects the rear end of the sheet 41, the sheet 4
1 may be stopped to perform the punching process.

By the way, in the calculation of the moving distance when the punch processing apparatus main body 40 is moved, if the moving distance is plus (when the next sheet 41 is small), the punch moving motor 83 is rotated forward and the moving distance is reduced. If the value is minus (when the next sheet is large), the punch movement motor 83
To reverse. In this image forming apparatus, the sheet 4
Seat 4 based on one side edge in the right direction with respect to one traveling direction
1 is set to be conveyed.

In the second embodiment, if the punch processing apparatus main body 40 moves by Fmm when the punch moving motor 83 is operated for 1 second, for example, from the home position (first standby position) to the second position. To the standby position ((L1
/ 2-L2 / 2) / F) The punch movement motor 83 is operated only during the sec.

Further, an encoder 78 having a slit 77 formed at an equal angle as shown in FIG. 7 and fixed to a guide shaft 82 for moving the punch processing apparatus main body 40, a sensor 79 for detecting the slit 77, and a sensor 79 for detecting the slit 77 79
If a counter for counting the number of slits 77 detected by the punching device is provided, and the moving distance of the punch processing apparatus main body 40 corresponding to the angle of the adjacent slit 77 is G mm, the counter moves from the start of the operation of the punch moving motor 83 to the slit 7.
7 and the counter counts ((L1 / 2−L2 /
By stopping the punch movement motor 83 when 2) / G) is reached, the punch processing apparatus main body 40 can be moved to the second standby position. If the punching motor 83 is a stepping motor and the Hmm punching apparatus main body 40 moves in one pulse, for example, ((L1 / 2)
-L2 / 2) / H) The punch movement motor 83 may be stopped after the pulse is output (the output of the pulse is stopped). To move the punch processing apparatus main body 40 from the standby position to the home position, the punch moving motor 83 is reversed, and the home position detection sensor 87 detects the actuator 86 provided on the punch processing apparatus main body 40, and immediately after the punch moving motor 83 83 is stopped.

The sheet conveying direction end face detection sensor 76 fixedly arranged on the sheet conveying path is used to reduce the influence of skew on the sheets 41 of all width sizes that can be punched. It is located between the center line of the and the minimum size that can be punched. In addition,
As described above, the position of the edge detection sensor in the sheet conveyance direction is most accurate because the two punch blades 55 and 56
This is the case when the center is set. Therefore, in the second embodiment, as described above, the punching device main body 40
A sheet conveyance direction end surface detection sensor 88 is integrally mounted at a position on the sheet conveyance path, which is the center of the two punch blades 55 and 56, and is configured to be linked with the movement of the punch processing device main body 40. This is so configured that the center of the punch blades 55 and 56 at each standby position always coincides with the center line of the sheet 41 of each width size, so that the punch processing can be performed while minimizing the influence of skew. Can be done.

Further, in the above-mentioned punch processing apparatus, when returning from a certain standby position to the home position (first standby position), within a certain period of time from the start of operation of the punch movement motor 83 due to a failure of the punch movement motor 83 or the like. If the home position detection sensor 87 does not detect the actuator 86, it is determined that the punch moving means has failed. Similarly, to move from the home position (first standby position) to a certain standby position, the home position detection sensor 87 detects the actuator 86 even after a certain time has elapsed from the start of the operation of the punch movement motor 83. If the punching operation is still performed, it is also determined that the punch moving means has failed. At the time of this failure, as shown in FIG. 13, if the home position detection sensor 87 detects the actuator 86, the punch processing apparatus main body 40 is at the home position, and as shown in FIG. The sheet 41 having the maximum size in the width direction running on the main body 40 of the punching apparatus can run. Therefore, in this case, the image forming apparatus is set so as to prohibit only the punching process, and after forming an image on the sheet 41, discharge the sheet 41 without performing the punching process.

On the other hand, if the home position detecting sensor 87 has not detected the actuator 86, as shown in FIGS. 17 and 18, the coupling member 69 of the punch processing device main body 40 has a There is a possibility that the sheet 41 having the maximum size in the direction has protruded to a position where it hinders the travel of the sheet. Therefore, in this case, the punching process is prohibited and the mode in which the sheet 40 travels in the punch processing device main body 40 is also prohibited, and the fact is displayed on the operation panel of the image forming apparatus.

In the punching apparatus according to the second embodiment, when the home position detecting sensor 87 moves from one standby position to another standby position,
From the position where no
In the case of moving to a position where is not detected, a failure of the moving means of the punch processing device cannot be detected. In this case, each time the punch processing apparatus main body 40 is moved to another standby position, the punch processing apparatus main body 40 is temporarily returned to the home position (first standby position), and the punch processing apparatus main body 40 is moved from this home position to another standby position. With this configuration, the failure detection may be performed based on the presence or absence of the detection of the home position detection sensor 87.

As described above, in the case of the second embodiment, even if the image forming apparatus to which the punching apparatus is applied employs a so-called side registration method, the sheet 41 may be displaced or skewed in the width direction. If the sheet 41 is smaller, the punching apparatus main body 40 can be moved in accordance with the size of the sheet 41 in the width direction, and the punching process can always be performed at the center of the sheet 41 in the width direction.

In the second embodiment, the sheet 41
The punch processing device main body 40 is previously moved to a predetermined standby position based on the size information and the punching process execution information. Therefore, even when the size of the sheet 4 is changed, the punch processing device main body is quickly moved. The movement of 40 can be completed, and it is possible to cope with an apparatus having a high image forming speed. In addition, when the punch processing is not performed in the punch processing apparatus, the punch processing apparatus main body 40 is immediately moved to the same home position as the first standby position for the sheet 41 having the largest size in the width direction to be in a standby state. After punching the sheet 41 whose size in the width direction is small,
Even when the sheet 41 having a large size in the width direction is conveyed, it is possible to reliably prevent the sheet 41 from being caught by the connecting member 69 of the punching apparatus main body 40 and causing a paper jam.

Third Embodiment FIGS. 19 and 20 show a punch processing apparatus according to a third embodiment of the present invention. In the punch processing apparatus according to the third embodiment, the image forming apparatus to which the punch processing apparatus is applied forms an image based on one end of the photosensitive drum 20 in the axial direction, and a sheet such as a recording sheet. This is a so-called "side registration" type in which an image is formed by transporting the sheet 41 with one end in the width direction as a reference, and is applied to an apparatus in which the sheet 41 has a large variation in the width direction and a small skew. In the case of this punching apparatus, the position of the center line in the width direction of each sheet 41 changes individually depending on the size of the sheet 41 and the variation in the position in the width direction. Sheets 4 of each size taking into account variations in the width direction
It is necessary to perform the punching process after the alignment with the center line of No. 1.

Therefore, in the punch processing apparatus according to the third embodiment, similarly to the second embodiment, the punch unit 50 and the punch unit 50 are formed based on the size information of the sheet 41 in the width direction and the information on whether or not the punch processing is performed. The punching apparatus main body 40 including the die unit 51 is provided with a moving mechanism for moving the sheet 41 in the width direction of the sheet 41 according to the size of the sheet 41 and the like. It is configured to include two sheet width direction end surface detection sensors 90 and 91 for detecting the width direction end surface of the sheet 41 that moves together with the punch processing device main body 40.

Now, the sheet 4 of the image forming apparatus will be described.
The maximum variation in the width direction position in the transport condition of 1 is ±
If it is K, the punch processing apparatus main body 40
In the home position, as shown in FIG.
6 are arranged so as to be shifted from the center line of the sheet 41 having the maximum size in the width direction at the regular position by K + α (α is a margin for providing a margin). The reason for taking the margin α when determining the home position of the punch processing apparatus main body 40 is as follows. In other words, when the sheet width direction edge detecting sensors 90 and 91 detect the width direction edge of the sheet 41 while moving the punch processing device body 40 along the width direction of the sheet 41, if there is no margin α, the stepping is performed. The punch moving motor 83 composed of a motor or the like is started to start the movement of the punch processing device main body 40. The end face of the sheet 41 in the width direction is detected, and there is a possibility that the main body 40 of the punching apparatus stops. In this case, in order to stop the punch processing apparatus main body 40 before the moving speed becomes constant, the punch processing motor 83 is stopped, and then the punch processing apparatus main body 40 is actually stopped. The amount by which the main body 40 moves due to inertia varies, and the stop position of the punch processing apparatus main body 40 cannot be accurately controlled. Therefore, by taking the margin α when determining the home position of the punching device main body 40, after the moving speed of the punching device main body 40 becomes constant, the paper width direction end face detection sensors 90, 91
Can be configured to detect the widthwise end surface of the sheet 41, and the sheet width direction end surface detection sensors 90 and 91 detect the widthwise end surface of the sheet 41 and stop the punch moving motor 83, This is because the distance until the punch processing device main body 40 actually stops due to inertia can always be kept constant.

The first paper width direction end face detection sensor 90 is arranged at a position away from the center line of the punch blades 55 and 56 by M1 = (L1 / 2) along the width direction of the sheet 41. . At this time, the maximum size of the sheet 41 that can be punched (for example, the size in the short direction of the A3 size)
Is L1. Further, the second paper width direction end surface detection sensor 91 detects M2 = M2 = from the center line of the punch blades 55 and 56.
(L2 / 2). At this time, L2 is a certain paper width size smaller than the maximum size width L1 (for example, B5 size in the longitudinal direction). The first
Of the sheet 4 detected by the sheet width direction end surface detection sensor 90 of FIG.
The size of No. 1 is set to a size exceeding L2 and equal to or less than L1, and the sheet size detected by the second sheet width direction end face detection sensor 91 is set to a size of L2 or less.

Further, the home position detecting sensor 93 detects that the punch processing device main body 40 is at the home position (first standby position).
Is located at a position where the actuator 86 attached to the punch processing apparatus main body 40 is detected. Further, the second standby position detection sensor 94 detects that the punch processing device main body 40 has moved from the home position (L1 / 2−L2).
/ 2), the punch processing device main body 40
Is disposed at a position where the actuator 86 attached to the sensor 86 is detected. In addition, upstream of the second transport roll pair 43, the edge of the sheet 41 in the transport direction is started in order to start the edge detection operation in the paper width direction by the paper width direction edge detection sensors 90 and 91 of the punching apparatus main body 40. A paper conveyance direction end surface detection sensor 95 to be detected is arranged.

The main body 40 of the punching apparatus is
When the width is determined by the sheet size change information and the punching is performed based on the punching execution information, the sheet 41 is set to wait at the home position if the width of the sheet 41 is longer than L2, and to the second standby position if the width is equal to or less than L2. I have. Further, the punch processing apparatus main body 40 is set to stand by at the home position when no punch is detected by the punch processing execution information regardless of the sheet size change information.

In the third embodiment, the sheet conveying path located on the upstream side of the punching blade is configured to bend toward the punching blade.

That is, in the third embodiment, FIG.
As shown in FIG. 5, the portions 59a and 60c of the punch portion paper guide 59 and the die portion paper guide 66 that form the sheet transport path 52 are positioned downward at a predetermined angle θ over a predetermined length. It is formed to be bent.

Also, the first and second transporting sheets 41
Are arranged along the horizontal direction, and the bent portions of the punch paper guide 59 and the die paper guide 66 are the same as the first and second transport roll pairs 42, 43. It is arranged so that it may be located on the surface of. As a result, the perforation processing device main body 50 is arranged in a state of being inclined by an angle θ with respect to the horizontal direction.

As described above, in the third embodiment, FIG.
As shown in FIG. 0, portions 59a and 60c located on the sheet introduction side of the punch portion paper guide 59 and the die portion paper guide 66 forming the sheet transport path 52 are downwardly inclined at a predetermined angle θ over a predetermined length. The leading end of the sheet 41 introduced into the sheet conveying path 52 passes through a portion 59 a of the punch section paper guide 59 which is located on the sheet introduction side, and then is bent. The sheet 59 moves inside the sheet transport path 52 in a state where it hits the lower surface of the sheet 59 and is bent downward. Therefore, the leading end of the sheet 41 abuts against the lower surface of the punch paper guide 59 and is bent downward.
1, a downward bending force acts on the first paper guide 1 and the paper guide 59 does not get caught in the through hole 59 a of the punched paper guide 59, so that the occurrence of paper jam can be effectively prevented.

In the above-described configuration, the punch processing apparatus according to the third embodiment can accurately punch a sheet having a large variation in the width direction and a small skew in a side registration type image forming apparatus as follows. Processing can be performed.

Now, according to the sheet size information, the sheet 41
When the width of L3 is smaller than L2 and the punching is performed according to the punching execution information, before the first sheet 41 is conveyed to the punching apparatus main body 40, the punching apparatus main body 40 From the indicated home position, the second standby position detection sensor 94 moves to a second standby position (a position shown by a broken line in the figure) where the actuator 86 is detected. In this case, it is determined that the end face of the sheet 41 is to be detected by using the second sheet width direction end face detection sensor 91, and the second sheet width direction end face detection sensor 91 is determined.
The distance from when the sheet edge is detected to when the punch movement motor 83 is stopped is (L2 / 2−L3 / 2) mm, and this distance data is converted into any of time, count number, or pulse number. And the punch processing device body 40
The control amount when moving is determined.

The main body 40 of the punching apparatus is
The second standby position detection sensor 94 is connected to the actuator 86
Is moved to a second standby position for detecting the stop and temporarily stopped.
The movement of the punch processing apparatus body 40 to the second standby position is immediately performed as soon as the width size of the punched sheet 41 is known from the sheet size information. In the second standby position, even if the sheet 41 has a maximum width variation of −K, there is a gap between the second sheet width direction end face detection sensor 91 and the sheet 41 width direction end face.
A distance of at least the margin α is secured. Thereafter, when a predetermined time has passed after the leading end of the sheet 41 has passed the sheet conveying direction end face detection sensor 95 and the end face of the sheet 41 can be detected by the second sheet width direction end face detection sensor 91, the punch processing apparatus The main body 40 starts moving again, and the second paper width direction end surface detection sensor 91
An operation of detecting the end face of the sheet 41 is performed. Then, when the second sheet width direction end face detection sensor 91 detects the end face of the sheet 41, the punch processing motor main body 40 sets the punch movement motor 83 to (L2−2−L3 / 2).
It is driven by a distance corresponding to mm and stops. In this state, the centers of the punch blades 55 and 56 of the punch processing apparatus main body 40 are at a position of L3 / 2 mm from the end face of the sheet 41, that is, the center of the sheet 41 having the width L3 in the width direction. The apparatus main body 40 performs a punching process on the sheet 41 in the same manner as in the first embodiment.

When the width L3 of the sheet 41 in the width direction is larger than L2, and the punching is indicated by the punching execution information, the first sheet 41 is moved to the punching apparatus main body 4.
Before being transported to zero, the punch processing apparatus main body 40 moves to the home position. Further, it is determined that the sheet width direction end face detection sensor 90 detects the end face of the sheet 41, and the distance from when the sheet width direction end face detection sensor 90 detects the end face of the sheet 41 to when the punch movement motor 83 is stopped. Is (L2 / 2−L3 / 2) mm, which is converted into time, count number, or pulse number, and control is determined. Thereafter, similarly to the above case, the end face detection of the sheet 41 by the sheet width direction end face detection sensor 90, the stop of the punch processing apparatus main body 40, and the punch processing are performed.

In the above control, the timing at which the paper width direction end face detection sensors 90 and 91 start detecting the end face of the sheet 41 is such that the leading end of the sheet 41 reaches the paper width direction end face detection sensors 90 and 91 at the earliest. After that.

FIGS. 21 to 23 illustrate how the influence of the skew of the sheet 41 appears when the position at which the sheet width direction end face detection sensors 90 and 91 perform the end face detection operation of the sheet 41 is changed. It was done. In the case where the punching process is performed on the rear end of the sheet 41, as shown in FIG. 21, when the end face of the sheet 41 is detected near the front end of the sheet 41 in the sheet conveyance direction, the punch at the rear end of the sheet 41 is affected by the skew of the sheet 41. There is a possibility that the position of the hole 70 is greatly shifted. Therefore, as shown in FIG. 23, it is better to detect the end face of the sheet 41 in the sheet traveling direction as much as possible near the rear end of the sheet 41 than to detect the end face in the sheet conveyance direction near the leading end of the sheet 41. And the punch holes can be formed with high accuracy. Therefore, the arrangement of the paper width direction end surface detection sensors 90 and 91 may be set at the rear end of the punch processing apparatus main body 40 in the transport direction.

In the above-mentioned punching apparatus, the sheet 4
In order to perform the punching process after the sheet 1 is temporarily stopped, the sheet width direction end face detection sensor 9 is stopped after the sheet 41 is stopped.
If the end face in the conveyance direction of the sheet 41 is detected by 0 and 91, the influence of the skew can be reduced. However, in this case, the time during which the sheet 41 is stopped becomes longer due to the time required for the punching process and the time required for the operation of detecting the end face in the paper transport direction (the time differs depending on the paper width size). In the machine, the next sheet 41 is conveyed into the punch processing apparatus main body 40, and there is a possibility that a paper jam or the punch processing is performed up to the next sheet.

From these facts, in the third embodiment, the sheet width direction end face detection sensor 9 is detected after the sheet conveyance direction end face detection sensor 95 detects the leading end of the sheet 41.
The time until 0, 91 starts the end face detection operation of the sheet 41 is changed based on the sheet size information.
When the punching process is performed on the rear end of the sheet 41, as shown in FIG. 23, the end face detection operation by the sheet width direction end face detection sensors 90 and 91 is performed at a position as close to the rear end of the sheet 41 as possible. Timing is controlled.

Then, after performing these controls, the sheet conveying direction end face detecting operation is performed for each sheet 41 and the second embodiment is performed.
And a return operation to the standby position is performed.

By the way, if the selected paper width direction edge detection sensors 90 and 91 do not detect the width direction edge of the sheet 41 within a certain time after starting the paper width direction edge detection operation, the punching process is not performed. The sheet 41 is carried out of the punching apparatus main body 40 as it is without performing. this is,
When the variation in the sheet width direction becomes larger than a predetermined value due to some factor, it takes longer time to detect the end face in the sheet width direction than expected. This is because there is a possibility that the robot cannot move any more.

Therefore, in the punching apparatus according to the third embodiment, if the detecting operation of the end face in the sheet width direction takes too much time, the punching processing is performed up to the paper jam or the next sheet for the above-described reason. There is a possibility that the position of the punch hole in the processing device may be shifted. Therefore, such a sheet 41 is carried out from the punch processing apparatus without performing the punching process. Then, when the width direction end face detection failure of the sheet 41 occurs, a message to the effect that the punching process could not be performed is displayed on the operation panel of the image forming apparatus.

Further, the sensor 76 for detecting the end face in the sheet conveying direction
Is fixed between the center line of the maximum size that can be punched and the center line of the minimum size that can be punched in order to reduce the influence of skew on all the sheet sizes that can be punched. Are located. Further, the position of the end face detection sensor 76 in the sheet conveyance direction having the highest accuracy is when the position is set at the center of the two punch blades 55 and 56 as described above. Therefore, also in the third embodiment, the sheet conveyance direction end face detection sensor 88 is integrally attached to the center of the two punch blades 55 and 56 of the punch processing apparatus main body 40 at a position on the sheet conveyance path, and the punch processing is performed. It is also configured to link with the movement of the device main body 40. This is because the center of the punch blades 55 and 56 at each standby position always coincides with the center line of the sheet 41 of each width size, so that the punch processing can be performed with the influence of the skew reduced as much as possible. . In addition, the sheet conveyance direction end surface detection sensors 76 and 88 can be used properly as needed.

As described above, in the third embodiment, even if the image forming apparatus is of the side registration type, and the sheet skew is large and the skew is small, the sheet width direction end face detection sensor 90 Or 91, it is possible to actually detect the end face of the sheet 41 whose position in the width direction may vary, move the punch processing apparatus main body 40 to an appropriate position, and execute punch processing. Therefore, punch processing can always be performed with high accuracy. In addition, the paper width direction end face detection sensor 90 or 91 is attached to the punch processing apparatus main body 40 and moves along the width direction of the sheet 41 together with the punch processing apparatus main body 40. Is simple, and the end face of the sheet 41 can be detected with high accuracy. Accordingly, there is no need to densely fix and arrange a plurality of paper width direction end surface detection sensors, so that cost can be reduced.

In the third embodiment, the sheet 41
After the punch processing apparatus main body 40 has been moved to a predetermined standby position in advance according to the width information of the sheet, the end face detection of the sheet 41 by the sheet width direction end face detection sensor 90 or 91 and the alignment of the punch blades 55 and 56 are performed. Therefore, even when the sheet size is changed, the time required until punching becomes possible is short, appropriate punching can be performed in a short time, and the invention can be applied to a high-speed image forming apparatus. .

In the third embodiment, a plurality of paper width direction end face detection sensors 90 and 91 are provided, and
The paper width direction end face detection sensors 90 and 91 to be used are selected according to the width direction size information of the sheet 41, and the width direction end faces of the sheet 41 are detected by the selected paper width direction end face detection sensors 90 and 91. Although the punching process is performed under the condition determined for each sheet 41, the present invention is not limited to this. That is, only one sheet width direction end face detecting means is disposed, and the sheet width direction end face detecting means detects the width direction end face of the sheet member in accordance with the width direction size information of the sheet member, and then the punching is performed. It is a matter of course that the time until the moving means of the mechanism is stopped is determined, and the punching process is performed under the conditions determined for each sheet-shaped member.

FIG. 24 shows a modification of the third embodiment.

FIG. 24 shows that the portions 59a and 60c of the sheet guide 59 on the sheet introduction side of the sheet guide 59 and the sheet guide 66 of the die portion constituting the sheet conveying path 52 are not bent downward by a predetermined angle θ. The punch portion paper guide 59 and the die portion paper guide 66 are formed in a straight line as in the above-described embodiment, and the sheet transport path 52 formed by the punch portion paper guide 59 and the die portion paper guide 66 is formed. The whole is arranged so as to be inclined downward by a predetermined angle θ. As a result, the perforation processing device main body 50 itself is arranged in a state of being inclined by an angle θ with respect to the horizontal direction.

Fourth Embodiment FIGS. 25 and 26 show a punching apparatus according to a fourth embodiment of the present invention. The punch processing apparatus according to the fourth embodiment is configured such that the image forming apparatus to which the punch processing apparatus is applied forms an image based on a central portion of the photosensitive drum 20 in the axial direction, and a sheet such as a recording sheet. This is a so-called “center registration” type in which an image is formed by transporting the sheet 41 with reference to the center in the width direction, and is applied to an apparatus in which the sheet 41 has large variation in the width direction and small skew. In the case of this punching apparatus, the position of the center line in the width direction of each sheet 41 changes individually due to the variation in the position of the sheet 41 in the width direction. It is necessary to perform the punching process after adjusting to the center line of the sheet 41 in consideration of the variation.

Therefore, in the punch processing apparatus according to the fourth embodiment, similarly to the third embodiment, the punch unit 50 and the punch unit 50 are formed based on the size information of the sheet 41 in the width direction and the information on whether or not the punch processing is performed. The punching apparatus main body 40 including the die unit 51 is provided with a moving mechanism for moving the sheet 41 in the width direction of the sheet 41 according to the size of the sheet 41 and the like. It is configured to include two sheet width direction end surface detection sensors 90 and 91 for detecting the width direction end surface of the sheet 41 that moves together with the punch processing device main body 40.

Now, the sheet 4 of the image forming apparatus will be described.
The maximum variation in the width direction position in the transport condition of 1 is ±
If K, the punch processing apparatus main body 40
In the home position, as shown in FIG.
6 are arranged so as to be shifted from the center line of the sheet 41 having the maximum size in the width direction at the regular position by K + α (α is a margin for providing a margin). Then, the first paper width direction end surface detection sensor 90 is
The punch blades 55 and 56 are arranged at positions separated from the center line of the punch blades 55 and 56 by M1 = (L1 / 2) along the width direction of the sheet 41. At this time, the width of the maximum size of the sheet 41 that can be punched (for example, the size in the short direction of the A3 size) is L1.
And Further, a second paper width direction end surface detection sensor 91
Is located at the center position M3 = (L1 / 4 + L4 / 4) between the end face of the maximum punchable size and the end face of the minimum punchable size, where the width of the minimum punchable size is L4.
The size of the sheet detected by the first sheet width direction end face detection sensor 90 exceeds (L1 / 2 + L4 / 2) and
The second sheet width direction end face detection sensor 9 is set as follows.
1 detects the sheet size as (L1 / 2 + L4 /
2) It is set as follows. The sheet conveyance direction end surface detection sensor 88 is disposed at a position corresponding to the center of the punch blades 55 and 56. This position is referred to as a home position (first standby position), and the home position detection sensor 93 detects the actuator 8 of the punch processing apparatus main body 40 at the home position.
6 is detected. Further, the second standby position detection sensor 9
4 is from the home position detection sensor 93 (L1 / 4 + L
4/4) and are located at a second standby position. Note that a paper transport direction end surface detection sensor 95 is provided upstream of the second transport roll pair 43 in order to start the paper transport direction end surface detection operation of the punch processing device.

In the above-described configuration, in the punching apparatus according to the fourth embodiment, the sheet is conveyed based on the center in the width direction as described below, and the sheet having a large variation in the width direction and a small skew is provided as follows. It is possible to perform a punching process with high accuracy.

Now, if it is determined that a punch is present based on the width size based on the sheet size change information and the punching execution information, the punch processing apparatus main body 40 sets the width size of the sheet 41 to L1.
Or, if (L1 / 2 + L4 / 2), wait at the home position, otherwise wait at the second standby position. Also, regardless of the sheet size change information, if there is no punch due to the punch processing execution information, the apparatus stands by at the home position.

Next, if the width size is L3 ((L1 / 2 + L4 / 2) <L3 <L1) according to the sheet size information and the presence of the punch is determined according to the punching execution information, the first sheet 41 is moved to the punch processing apparatus main body. Before being transported to 40,
The punch processing device main body 40 moves from the home position to a position where the standby position detection sensor 94 detects the actuator 86. Further, it is determined that the widthwise end surface of the sheet 41 is detected by the paper width direction end surface detection sensor 90, and the punch movement motor 83 is stopped after the paper width direction end surface detection sensor 90 detects the end surface of the sheet 41. Since the distance to this is (L1 / 2−L3 / 2) mm, this is converted into time, count number, or pulse number, and control is determined.

Further, according to the sheet size information, the width size L
3 is L3 <(L1 / 2 + L4 / 2), and if punching is detected by the punching execution information, before the first sheet is conveyed to the punching device, the punching device main body 40
It moves from the home position until the standby position detection sensor 94 is detected. Further, it is determined that the detection is performed by the paper width direction end surface detection sensor 91, and the distance from the detection to the stop of the punch movement motor is ((L1 / 2 + L4 / 2) /
2-L3 / 2) is converted into a time, count number, or pulse number to determine the control.

Further, when the width size L3 is L3 = L1 according to the sheet size information and the punching is detected according to the punching execution information, before the first sheet 41 is conveyed to the punching device, the punching device main body 40 Move to home position. Further, it is determined that the detection is performed by the sheet width direction end face detection sensor 90, and the distance from the detection to the stop of the punch movement motor 83 is 0 mm, so that the detection is immediately stopped after the detection.

Further, according to the sheet size information, the width size L
3 is L3 = (L1 / 2 + L4 / 2), and if punching is detected by the punching execution information, before the first sheet 41 is conveyed to the punching device main body 40, the punching device main body 40 is moved to the home position. Move up to. Further, it is determined that the detection is performed by the sheet width direction end surface detection sensor 91, and the distance from the detection to the stop of the punch movement motor 83 is 0 mm, so that the detection is immediately stopped after the detection.

The other operations are exactly the same as those of the third embodiment, and the description is omitted.

The sheet conveying direction end surface detecting sensor 76 is fixed substantially at the center of the sheet 41 in the width direction. Also,
The highest accuracy is achieved by fixing the punch blades 55 and 56 to the punch processing apparatus main body 40 on the paper transport path located at the center of the punch blades 55 and 56.
This is a case where it is linked with the movement of the punch processing device main body 40. This is because, as described above, when the sheet conveyance direction end face detection sensor 88 detects the sheet conveyance direction end face, it always coincides with the center of each sheet width size.

Fifth Embodiment FIGS. 27 and 28 show a punching apparatus according to a fifth embodiment of the present invention. According to the punch processing apparatus of the fourth embodiment, the image forming apparatus to which the punch processing apparatus is applied forms an image based on one end of the photosensitive drum 20 in the axial direction, and a sheet such as a recording sheet. This is a so-called "side registration" type in which an image is formed by transporting the sheet 41 with reference to one end in the width direction, and the sheet 41 has a large variation and skew in the width direction and is applied to the apparatus. In the case of this punch processing apparatus, since the skew of the sheet 41 is large, first, after correcting the skew of the sheet 41, the position of the center line in the width direction of each sheet 41 is adjusted to the size of the sheet 41 and the position in the width direction. Since the individual values vary depending on the variation, it is necessary to perform the punching process after aligning the centers of the punch blades 55 and 56 with the center lines of the sheets 41 of each size in consideration of the variation in the width direction of the sheet 41.

Therefore, in the punching apparatus according to the fifth embodiment, similarly to the third embodiment, the punching section 50 and the punching section 50 are formed based on the size information of the sheet 41 in the width direction and information on whether or not punching has been performed. The punching apparatus main body 40 including the die unit 51 is provided with a moving mechanism for moving the sheet 41 in the width direction of the sheet 41 according to the size of the sheet 41 and the like. It has two paper width direction end surface detection sensors 90 and 91 for detecting the width direction end surface of the sheet 41 moving together with the punch processing device main body 40, and furthermore, before the sheet 41 reaches the punch processing device main body 40, It is configured to correct skew.

As shown in FIG. 27 and FIG. 28, the skew correction is performed by temporarily stopping the second transport roll pair 43 and applying the first transport roll pair 43 to the stopped second transport roll pair 43.
By stopping the first transport roll pair 42 in a state where the leading edge of the sheet 41 transported by the transport roll pair 42 is abutted, the forward edge of the sheet 41 becomes parallel to the second transport roll pair 42. As described above, a device for correcting the skew of the sheet 41 is employed. This operation is performed when the rotation of the second transport roll pair 43 is started a predetermined time after the leading edge of the sheet 41 is detected by the paper transport direction end surface detection sensor 95, and the sheet passing through the second transport roll pair 43 is started. 41 is corrected for skew. In the fifth embodiment, the skew correction unit is combined with the punch processing apparatus of the third embodiment, and the skew-corrected sheet 41 is positioned by detecting the end face in the width direction of the sheet. It is configured such that there is no influence on the accuracy of the punched hole due to the displacement of the position.

In the fifth embodiment, a pair of transport members for transporting the sheet in a sandwiched state are provided near the upstream side of the punching blade. It is configured to be transported in an inclined state.

That is, in the fifth embodiment, FIG.
As shown in the figure, the second conveyance roll pair 43 for correcting the skew of the sheet 41 conveys the sheet 41 in a state where the sheet 41 is inclined obliquely upward by a predetermined angle θ with respect to the horizontal direction. Is made to abut against the lower surface of the punch paper guide 59 on the punch blade side.

In this way, the leading end of the sheet 41 conveyed by the second conveying roll pair 43 abuts against the lower surface of the punch paper guide 59.
The leading end of 1 is bent downward by the lower surface of the punch paper guide 59, and is conveyed along the punch paper guide 59 slightly downward. Therefore, the sheet 41
Is transported without being caught in the through-hole 59a of the paper guide 59 of the punch portion, so that it is possible to reliably prevent paper jam.

Sixth Embodiment FIGS. 29 and 30 show a punch processing apparatus according to a sixth embodiment of the present invention. The punch processing apparatus according to the sixth embodiment is configured such that the image forming apparatus to which the punch processing apparatus is applied forms an image with reference to a central portion of the photosensitive drum 20 in the axial direction, and a sheet such as a recording sheet. This is a so-called "center registration" type in which an image is formed by transporting the sheet 41 with reference to the center in the width direction, and is applied to an apparatus in which the sheet 41 has large variations and skews in the width direction. In the case of this punch processing apparatus, since the skew of the sheet 41 is large, first, after correcting the skew of the sheet 41, the position of the center line in the width direction of each sheet 41 is individually changed due to the variation in the position of the sheet 41 in the width direction. , The center of the punch blades 55 and 56 is set in consideration of the width variation of the sheet 41 in the sheet 4.
It is necessary to perform the punching process after adjusting to the center line of No. 1.

Therefore, in the punching apparatus according to the sixth embodiment, similarly to the third embodiment, the punch section 50 and the punching section 50 are formed based on the size information of the sheet 41 in the width direction and the information on whether or not the punching process has been performed. The punching apparatus main body 40 including the die unit 51 is provided with a moving mechanism for moving the sheet 41 in the width direction of the sheet 41 according to the size of the sheet 41 and the like. It has two paper width direction end surface detection sensors 90 and 91 for detecting the width direction end surface of the sheet 41 moving together with the punch processing device main body 40, and furthermore, before the sheet 41 reaches the punch processing device main body 40, It is configured to correct skew.

As the skew correction, as shown in FIGS. 29 and 30, a skew correction apparatus having the same configuration as the punch processing apparatus according to the fifth embodiment can be used.

The other configuration and operation are the same as those of the above embodiment, and the description thereof will be omitted.

[0130]

As described above, according to the present invention, even when the number of holes to be punched in a sheet such as a sheet increases,
A perforation processing apparatus and an image forming system using the perforation processing apparatus, which can surely prevent a sheet jam from being caught in a hole of a perforation unit and causing a paper jam, can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a perforation processing apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a plan view showing a perforation processing apparatus according to Embodiment 1 of the present invention.

FIG. 3 is a configuration diagram showing an image forming apparatus to which the punching apparatus according to Embodiment 1 of the present invention can be applied;

FIG. 4 is a configuration diagram showing an automatic document feeder used in the image forming apparatus shown in FIG. 3;

FIG. 5 is a front view showing a perforation processing apparatus according to Embodiment 1 of the present invention.

FIG. 6 is an explanatory view showing a state in which a sheet is punched.

FIG. 7 is a configuration diagram showing an encoder.

FIG. 8 is an explanatory diagram showing a state of punching a sheet.

FIG. 9 is an explanatory view showing a state in which a sheet is punched.

FIG. 10 is an explanatory diagram showing a state in which a sheet is punched.

FIG. 11 is a cross-sectional view showing a modification of the punching apparatus according to Embodiment 1 of the present invention.

FIG. 12 is a sectional view showing a modified example of the perforation processing apparatus according to Embodiment 1 of the present invention.

FIG. 13 is a plan view showing a punching apparatus according to Embodiment 2 of the present invention.

FIG. 14 is a sectional view showing a perforation processing apparatus according to Embodiment 2 of the present invention.

FIG. 15 is a front view showing a perforation processing apparatus according to Embodiment 2 of the present invention.

FIG. 16 is a sectional view showing a modification of the punching apparatus according to Embodiment 2 of the present invention.

FIG. 17 is a front view showing a punching apparatus according to Embodiment 2 of the present invention.

FIG. 18 is a cross-sectional view showing an operation of the perforation processing apparatus according to Embodiment 2 of the present invention.

FIG. 19 is a plan view showing a punching apparatus according to Embodiment 3 of the present invention.

FIG. 20 is a sectional view showing a perforation processing apparatus according to Embodiment 3 of the present invention.

FIG. 21 is an explanatory view showing a state in which a sheet is punched.

FIG. 22 is an explanatory view showing a state in which a sheet is punched.

FIG. 23 is an explanatory view showing a state in which a sheet is punched.

FIG. 24 is a cross-sectional view showing a modification of the punching apparatus according to Embodiment 3 of the present invention.

FIG. 25 is a plan view showing a perforation processing apparatus according to Embodiment 4 of the present invention.

FIG. 26 is a sectional view showing a punching apparatus according to Embodiment 4 of the present invention.

FIG. 27 is a plan view showing a punching apparatus according to Embodiment 5 of the present invention.

FIG. 28 is a sectional view showing a perforation processing apparatus according to Embodiment 5 of the present invention.

FIG. 29 is a plan view showing a perforation processing apparatus according to Embodiment 6 of the present invention.

FIG. 30 is a sectional view showing a perforation processing apparatus according to Embodiment 6 of the present invention.

[Explanation of symbols]

40 punch processing apparatus main body (punch mechanism), 41 sheets, 42, 43, 44 transport roll pairs, 50 punch section,
51 die section, 52 sheet transport path, 55, 56 punch blade, 59 punch section paper guide (restriction member), 59a
Through hole, 59b Periphery of through hole, 67, 68 dies.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiyuki Takaishi 2274 Hongo, Ebina-shi, Kanagawa Prefecture F-Xerox Co., Ltd. F-term (reference) 3C060 AA02 BA01 BC03 BC06 BG18

Claims (6)

[Claims] A plurality of perforation blades are arranged at predetermined intervals in a direction perpendicular to the sheet conveying direction in a sheet conveying path, and on both sides of the sheet with the sheet conveying path interposed therebetween.
A regulating member for regulating the position of the sheet is provided, respectively, and a through-hole through which the punching blade penetrates is provided in the both regulating members, and the plurality of perforating blades protrude and retract from the sheet conveying path through the through-holes of both regulating members. In the punching apparatus for punching a plurality of holes in a sheet, a periphery of at least one of the through-holes of the two regulating members is recessed from the sheet conveying path in a substantially tapered shape. . 2. A guide member for guiding a sheet to one of the two regulating members is provided on a sheet conveying path upstream of at least one of the through holes of the two regulating members. 2. The perforation processing apparatus according to 1. 3. The perforation processing apparatus according to claim 1, wherein a sheet conveying path located upstream of the perforation blade is bent toward the perforation blade. 4. A pair of transport members for transporting a sheet in a sandwiched state near the upstream side of the punching blade, wherein the pair of transport members transport the sheet in a state where the leading end of the sheet is inclined toward the punching blade side. The perforation processing apparatus according to claim 1, wherein: 5. A plurality of punching blades are arranged at predetermined intervals in a direction perpendicular to the sheet conveying direction on a sheet conveying path on which an image is formed, and both sides of the sheet are sandwiched by the sheet conveying path. In each, a regulating member that regulates the position of the sheet is provided, respectively, and a through-hole through which a piercing blade penetrates is provided in the both regulating members,
An image forming system having a perforation processing device for perforating a plurality of holes in a sheet by causing the plurality of perforation blades to protrude and retract from a sheet conveying path, wherein the perforation processing device includes at least one of the two regulating members. An image forming system, wherein the periphery of a through hole is recessed from a sheet conveying path in a substantially tapered shape. 6. The image forming system according to claim 5, wherein a projection is provided in an upstream portion around at least one through hole of said both regulating members.