JP2516434B2 - Perforator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a plurality of punch blades that are movable back and forth with respect to a sheet conveyance path and are arranged in parallel in the width direction of conveyed sheets at a predetermined interval. The present invention relates to a punching die for introducing the punching blade and a punching device for introducing the punching blade into the punching die against a return urging means, the punching device being arranged in the vicinity of an outlet of a sheet to be conveyed.

[Conventional technology]

As a punching device for forming a punch hole for a file on a sheet after image formation, as shown in FIG. 7 of Japanese Utility Model Laid-Open No. 63-193698 and as shown in FIG.
A punch blade 52 is provided above the sheet conveying path 51 for discharging the sheet to the outside of the apparatus, and a punch by 53 for introducing the punch blade 52 is provided.
Is provided below the sheet conveying path, and cam type pushing means 55 for introducing the punch blade 52 into the punch die 53 against the return urging means 54 is provided.

In the punching device A described above, the lock mechanism 56 is unlocked and the pachi die 53 is rotated to the lower position so that the paper conveyance path 51 is wide open, and paper dust or the like is caught during punching. If a jam occurs due to the so-called locking of the punch blade 52 where the punch blade 52 cannot return backward, or if the punching target is thick paper or hard paper,
When the punching by the punch blade 52 is not achieved within a predetermined time (a control that is regarded as a sham is performed), a sham occurs in another transport system and the image forming apparatus pushes the punch blade 52 down by the pushing means 55. It is designed so that sham processing can be easily performed when, for example, the machine stops.

[Problems to be Solved by the Invention]

However, the above conventional example has the following disadvantages.

That is, the punch die 53 must be rotated downward to open the sheet conveyance path 51, and the jam handling work must be performed by looking up inside the device from below the outside of the device, and the work posture becomes unnatural. It became difficult to sham.

Furthermore, when the punch blade 52 is in a so-called locked state, or when the punch blade 52 is pressed by the pushing means 55, the punch die 53 cannot be rotated, and sham treatment is very difficult. Sometimes became.

In addition, since it is necessary to secure a large space for jam clearance below the punch die 53 in order to rotate the punch die 53 downward and perform jam clearance from below, an image forming apparatus incorporating the punching device A is required. In this case, there was a problem in achieving a compact size.

Further, in the case where image formation to punching are continuously performed, the punching position is slightly biased to one side or the other side in the width direction of the sheet a depending on the device, even though the models are completely the same. The drilling position may be slightly different. This is a peculiarity of the apparatus, and is considered to be caused by a very slight assembly error of the transport system, for example.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a punching device capable of eliminating the above inconveniences at once by a simple improvement.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention provides a plurality of punch blades that are movable back and forth with respect to a sheet conveying path and are arranged in parallel in the width direction of the conveyed sheet at predetermined intervals, and a punch die that introduces the punch blades. In the punching device in which the pushing means for introducing the punch blade into the punch die against the return biasing means is arranged near the discharge port of the conveyed sheet, the pushing means is provided on the opposite side of the support frame. On the other hand, the punch blade and the punch die are combined into a unit, and this unit is pivotally attached to the support frame so as to be able to be pulled out outward on the lower side of the unit and around the axis of the punch blade parallel arrangement direction.
It is characterized in that a moving means for moving the shaft together with the unit in the axial direction is provided.

[Action]

According to the above configuration, when the unit is rotated around the shaft and pulled out, the upper part of the unit is opened,
Moreover, since the pushing-out means remains on the side of the supporting frame, the punch blade on the pulled-out side of the unit becomes free.

Further, the punching position of the punch blade is changed by moving the shaft in the axial direction.

〔Example〕

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

FIG. 1 shows a punching device A, and FIG. 2 shows a compound copying type electrostatographic copying machine (an example of an image forming apparatus) in which the punching device A is incorporated. In this electrostatic photocopier, a photoconductor drum 4 is laterally mounted on an apparatus main body 3 having a document placing table 1 and a document presser 2 on the upper portion thereof, and a charging device 5 and a developing device are provided around the photoconductor drum 4. 6, a transfer device 7, a paper separating device 8, and a cleaning device 9 are provided, and an optical system moving type exposure device 10 is arranged in the upper space of the device main body 3, and further,
A paper feed / transport device 13 for transporting the paper a in the manual feed section 11 or the cassette case 12 to the transfer device 7, a paper discharge transport device 15 for transporting the paper a after transfer / separation to the fixing device 14, and
A sheet discharging unit 17 including a pair of upper and lower sheet discharging rollers 17a and 17b for discharging the fixed sheet a to the tray 16 is provided. A paper device 18 is provided, and a second paper discharging and conveying device 19 for selectively discharging the fixed paper a to the paper re-feeding device 18 is arranged. A conveyance device 20 is provided for confluently feeding the accommodated image-formed sheets a to the sheet feeding and conveying device 13.

When the copying machine mode is selected and the path switching claw 21 is switched to the position shown by the phantom line in FIG. 1, the second sheet discharging and conveying device 19 re-feeds the sheet a after the image formation. The first transport path 22 taken out to the paper device 18 and the first transport path 22
When a mode is selected in which the paper a taken out to the back is fed back on the first transport path 22, the second path switching claw 23 which is switched to the position shown by the phantom line in FIG. A second conveyance path 24 is provided to take out the sheet a guided by the path switching claw 2 to the re-feeding device 18.

Thus, the single-sided copy mode in which the image-formed sheet a fed from the manual feed section 11 or the cassette case 12 is discharged to the tray 16 as it is, and the image-formed sheet a is fed to the second transport path 24. Through the re-feeding device 18 in a reversed state, and re-feeding the re-feeding device 18 to the transfer device 7 at a predetermined timing, and the sheet a after image formation in the first and second transport paths. It is taken out to the re-feeding device 18 through 22 and 24 without turning it over and the transfer device 7 is taken at a predetermined timing.
It is configured so that a double-sided copy form of re-feeding can be selected.

As shown in FIGS. 3 and 4, the paper discharge means 17 is also provided.
On the lower side of the
It is pivotally mounted in a state in which it can be pulled out to the outside of the apparatus via a shaft 32 extending along the width direction of the conveyed paper a, and at the inner surface side of the discharge port cover 33 and in the vicinity of the upstream side of the paper discharge means 17. A punching device A is provided.

This punching device A is movable above and below the paper transporting path 25 from the fixing device 14 to the sheet discharging means 17, and is aligned at a predetermined interval in the width direction of the transporting paper a. A plurality of (two in the illustrated example) punch blades 26 provided
And the punch blade located at the lower side of the paper transport path 25.
A punch die 27 for introducing 26, a return urging means (for example, a coil spring) 28 for retracting and returning the punch blade 26 to a raised position, a recovery box 29 for recovering scraps from punch holes, and the recovery device The punch blade against the force means 28
It is composed of a cam type pushing means 30 for introducing 26 into the punch die 27, and the pushing means 30 is provided on the rotary shaft 40 on the side of the support frame pair 36, 36 in a state of corresponding to the upper end of the punch blade 26. . The illustrated supporting frames 36, 36 are formed by a pair of front and rear side plates that support the photosensitive drum 4 and the like.

Then, the constituent members for punching except the pushing means 30.
26 to 29, the sheet discharging means 17, a part of the first conveying path 22 of the conveying element 22a, and the first path switching claw 21 are provided on the inner surface side of the discharging port cover 33 of the sheet discharging guide 31, respectively. The axis
A unit U that can be pulled out outward around the center 32 is provided, and a moving means 34 for moving the shaft 32 in the axial direction together with the unit U is provided.

Specifically, while the pair of brackets 35, 35 are provided on the inner surface side of the discharge port cover 33 at a predetermined interval, the shaft 32
In a state in which the shaft portion on one end side of the is cut off, so-called D-cut processing is performed, and this D-cut portion is rotatably supported by
The brackets 35, 35 are attached to the support frame 3 via the shaft 32.
For example, E which is pivotally attached to the lower side of 6,36 and prevents the brackets 35, 35 from moving axially with respect to the shaft 32.
A fixing member 37 consisting of a ring is provided.

Then, two punch blades 26 are vertically movable at predetermined intervals at the centrally distributed portions of the U-shaped holder 38, and a return bias is provided for retracting and returning the punch blades 26 to the raised position. Means 28 are attached, and the holder 38, the paper discharge means 17, the punch die 27, the first path switching claw 21 of the conveying element 22a, and the paper discharge guide 31 are provided over the pair of brackets 35, 35, respectively. At the same time, the receiving member 39 of the scrap collection box 29 without the punch holes is attached to the discharge port cover 33.
It is provided on the inner surface side of.

On the other hand, the moving means 34 is provided with a small pitch thread portion b on the other end side of the shaft 32 which is non-rotatably supported by the D cut portion, and a hole c through which the thread portion b is inserted. The crank member 41 is screwed to the support frame pair 36 on the front side, and the two lock nuts d and e for fixing the shaft 32 by sandwiching the crank member 41 are screwed to the screw portion b. It will be done.

A sensor S for detecting the trailing edge of the sheet is provided immediately downstream of the fixing device 14, and based on the information when the sensor S detects the trailing edge of the sheet under the punch hole forming mode selection, At a predetermined timing, the driving of the paper discharging means 17 is stopped, the pushing means 30 is rotated once, and then the driving of the paper discharging means 17 is restarted.

According to the above construction, when the sensor S detects the trailing edge of the sheet in the state where the punch hole forming mode is selected, the sheet can be printed regardless of whether it is single-sided copying, composite copying or double-sided copying. Before the trailing edge passes through the location of the punch blade 26, the sheet discharging means 17 is stopped and the vicinity of the trailing edge of the sheet a is nipped, and then the pushing means 30 is driven to the punch die 27 of the punch blade 26. The introduction of paper a
Two punch holes for files are formed near the rear end of the
Further, when the punch blade 26 is returned to the raised position by the return urging means 28, the paper discharge means 17 is driven, so that the paper a having the punched holes is taken out to the tray 16.

When the two punch holes of the sheet a taken out to the tray 16 are displaced in the width direction of the sheet, loosen the nut d (or e) on the side where the punch holes are displaced. By tightening the other nut e (or d), the shaft 32 and thus the unit U are moved in the axial direction, whereby the punching position of the punch hole by the punching device A can be finely adjusted.

In addition, the unit U is attached to the support frame 36, the lower shaft 3 of the 36.
When it is rotated about 2 and pulled out, the pushing means 3
Since 0 remains on the side of the supporting frames 36, 36, the punch blade 26 on the unit U side pulled out becomes free, and in addition to the punch blade 26 becoming free, the unit U
Since the upper part of the sheet is opened, jam occurs due to the locking of the so-called punch blade 26 due to paper dust or the like being caught during punching, or the jam occurs in the other conveying system and the pushing means 30 When the apparatus is stopped while the punch blade 26 is being pushed down, the jam processing can be performed very easily in a comfortable posture by looking into the jam from above.

Further, by pulling out the unit U and taking out the recovery box 29 from the unit U, it is possible to easily carry out the scrap processing of punch holes.

It should be noted that the paper discharge roller 17b and the recovery box 29 on the lower side of the paper discharge means 17 are units different from the unit U for punching, and this other unit can be pulled out around the shaft 32. Modifications such as configuration are possible.

As the moving means 34 for the shaft 32, the crank member 41 described above is used.
In addition to the two nuts d and e that sandwich the screw threaded with the threaded portion b of the shaft 32, for example, a plate piece having an axially long hole formed at the end of the shaft 32 with a screw or the like. While fixed, support frame
In 36, a member having a screw hole that is screwed into the inserted set screw is fixed to the elongated hole with a screw or the like, and the set screw is loosened so that the shaft 32 is moved within the range of the elongated hole. It can be embodied by various structures such as a movable structure. FIG. 6 shows another embodiment of the moving means 34. This is one in which an inclined tooth f is formed on the other end side of the shaft 32, and a worm g is meshed with this inclined tooth f. The rotational motion of the handle 43 connected to the rotary shaft 42 of the worm g is achieved. Along with this, the shaft 32, and thus the unit U, is moved in the axial direction, whereby the punching position of the punch holes by the punching device A can be finely adjusted.

〔The invention's effect〕

The present invention has the above-described structure, and the constituent members for perforation except the pushing means are unitized, and the constituent members are pivotally attached to the support frame body so as to be able to be pulled out outward about the axis. By rotating the tool around the axis and pulling it outward, the punch blade provided in the unit becomes free and the upper part of the unit is opened, making jam handling easier. It can be done easily.

Moreover, since the shaft can be moved in the direction in which the punch blades are juxtaposed together with the unit, even in a situation where the punching position tends to be biased due to the peculiarity of the device, just by adjusting the shaft,
The entire unit moves in the direction in which the punch blades are arranged side by side, and punch holes can be punched at regular positions.

Further, when the punching device is built in the image forming apparatus, a space for jam processing is not required in the image forming apparatus as in the conventional case, so that the apparatus can be made compact.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a cross-sectional view of a punching device, and FIG. 2 is a schematic vertical section showing a compound copying type electrostatographic copying machine as an example of an image forming apparatus. Side view,
FIG. 3 is a perspective view showing a state in which the unit is pulled out, FIG. 4 is a cross-sectional view of the punching device as seen from the paper discharge direction, and FIG. 5 is an explanatory view of shaft moving means. FIG. 6 is an explanatory diagram of a shaft moving means showing another embodiment of the present invention. FIG. 7 is a cross-sectional view of a conventional punching device. 25 ... Paper transport path, 26 ... Punch blade, 27 ... Punch die, 28 ... Return biasing means, 30 ... Extrusion means, 32 ... Shaft,
34: moving means, a: paper, U: unit.

Claims (1)

(57) [Claims] 1. A plurality of punch blades which are movable back and forth with respect to a sheet conveying path and are arranged in parallel in the width direction of the conveyed sheet at predetermined intervals, a punch die for introducing the punch blades, and a return urging force. In a punching device in which an extruding means for introducing the punch blade into the punch die against the means is arranged in the vicinity of the discharge port of the sheet to be conveyed, while the extruding means is provided on the support frame side, the punch blade and the punch die are provided. As a unit, and this unit is pivotally attached to the support frame so as to be able to be pulled out outward on the lower side of the unit and around the axis in the punch blade juxtaposed direction, and further, the axis together with the unit in the axial direction. A punching device, characterized in that a moving means for moving the punching device is provided.