JPH05238588A - Paper conveyer for copying machine - Google Patents

Abstract

(57) [Abstract] [Purpose] When removing the paper when a paper jam occurs in the paper transporting device of a copying machine, when the suction unit is lowered to the paper removal position, the paper that comes into close contact with the suction belt surface is simply added. To make it easier to remove the paper. [Structure] In a paper transport mechanism of a copying machine that uses a suction unit, one or more holes are provided in the upper frame of the suction unit between the suction belts that are arranged side by side. The paper transporting device of the copying machine, in which each of the holes is provided with a paper removing projection whose tip projects from the hole above the upper surface of the suction unit only when the hole is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper conveying device for a copying machine, and more particularly to an improvement of paper removing means when a paper jam occurs in a paper conveying mechanism using a suction unit.

[0002]

2. Description of the Related Art As is well known, in electrophotographic technology, a photoconductive phenomenon is used to form an electrostatic latent image on a photoconductor, and toner is attached to the electrostatic latent image by electrostatic force. This is a technique for making a visible image. This visible image is transferred to the recording paper, and the toner that is not transferred and remains on the surface of the drum-shaped photoconductor is removed by a cleaner. This series of processes is repeated to perform continuous printing.

FIG. 4 is a front view schematically showing the vicinity of a paper processing device of a conventional copying machine using such an electrophotographic technique. In the figure, reference numeral 1 is a photosensitive drum, which rotates in a fixed direction, and the electrostatic latent image formed on the surface reaches the developing unit 2 and becomes a visible image by toner. An intermediate photoconductor 3 is arranged so that the visible image formed on the surface of the photoconductor drum 1 is transferred and is in contact with the second transfer roller 4 of the second transfer portion. Reference numeral 5 denotes a copy sheet, which is configured to pass between the intermediate photoconductor 3 and the second transfer roller 4 and be conveyed by the suction unit 6. Further, heat rollers 7, 8 and 9 are used for fixing, and during black-and-white copying, the middle heat roller 7 and the lower heat roller 8 are used for fixing through the paper path of the suction unit 6a. On the other hand, during full-color copying, the upper heat roller 9 and the middle heat roller 7 are used for fixing through the paper path of the suction unit 6b. Reference numeral 10 is a paper discharge roller for discharging the fixed copy, and 11 is a base plate.
Further, the suction unit 6 is a drive roller 1
The sheet 5 is conveyed by a suction belt 15 driven by a sheet No. 4, and a suction case (not shown) is provided on the back side of the belt 15, and the sheet 5 is attracted to the surface of the belt 15. It is configured to be transported.

Next, in the operation of the apparatus shown in FIG. 4, first, the electrostatic latent image formed on the surface of the photosensitive drum 1 is moved to the position of the developing section 2 by the rotating drum 1 to form a visible image by toner. After that, the copy paper 5 is transferred to the intermediate photoconductor 3 and the copy paper 5 is spun at a position where the photoconductor 3 contacts the second transfer roller 4.
The image is transferred from the (paper feeding) side and transferred to the paper 5 when passing between the photoconductor 3 and the transfer roller 4, and this has a suction case on the back side and is driven by the drive roller 14. The sheet is conveyed by the suction unit 6 provided with the belt 15, is fixed by the heat roller groups 7 to 9 on the FX (fixing) side, and is ejected from the sheet ejection roller 10. In this case, it may be a black and white copy. If
It is conveyed by the paper path of the suction unit 6a and is fixed by the middle heat roller 7 and the lower heat roller 8, and in the case of a full color copy,
It is conveyed by the paper path of the suction unit 6b and is fixed by the upper heat roller 9 and the middle heat roller 7.

[0005]

By the way, as shown in FIG. 4, a paper jam is often seen in the portion of the paper conveying means centering on the suction unit 6, which makes the copying operation complicated. .. Therefore, in the conventional paper processing device, as shown in FIG.
However, when the paper jammed paper is removed, the FX (fixing) side is lowered to the position of 6c, that is, to the level of the base plate 11, and the operator inserts his / her hand and holds the paper 5 directly from the gap created thereby. By doing so, it can be removed. However, various parts are arranged inside the copying machine, and when looking at the vicinity of the suction unit 6, there is only a slightly shaded portion as a gap 16, and as described above, the suction unit 6 is 6c. Then, there is enough space for insertion of the hand.

Therefore, the paper 5 when the paper is jammed in the first place
The conventional removal processing means of (3) has a slightly poor workability. Moreover, since the papers 5 that have been conveyed onto the suction unit 6 and have jammed are all unfixed copies, if the user directly touches and grips them to remove them, the toner will come off. However, there is also the inconvenience that it is extremely dirty. Further, the copy paper 5 is simply the suction unit 6
It is not conveyed freely through the upper paper path, but is conveyed while being in close contact with the surface of the suction belt 15 provided on the suction unit 6 from the back side thereof, which is sucked by the suction case. Even when the suction unit 6 moves down to the position 6c, the paper 5 remains in close contact with the belt 15, which also makes the paper removal process difficult when the paper is jammed. Therefore, it is an object of the present invention to remove the paper when the paper is jammed in the paper transporting device of the copying machine, and when the suction unit is lowered to the paper removing position, it is brought into close contact with the belt surface only by adding a simple means. Another object of the present invention is to provide a paper conveyance device for a copying machine that separates the formed paper and makes it easy to remove the paper.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the gist of the present invention is to provide a side-by-side arrangement in a paper conveying mechanism of a copying machine using a suction unit. The upper surface of the suction unit between the suction belts is provided with one or more holes for passage of protrusions, and the tip of the suction unit is above the upper surface of the suction unit only when the suction unit is lowered to the paper jammed paper removal position. A paper transporting device of a copying machine, in which a protruding paper removal protrusion is provided for each hole.

[0008]

In the present invention, when removing a paper jam in a paper processing device, a paper removing projection is further added to the conventional means for removing the paper by lowering the suction unit. Only when the unit is lowered, the tip is made to project above the hole provided on the upper surface of the suction unit, and the sheet that is in close contact with the suction belt is pushed up and separated from the belt. Therefore, it is possible to perform the same work as in the conventional method, and it is extremely easy to remove the jammed sheet as compared with the conventional method.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings. A perspective view of an embodiment of the suction unit 6 used in the present invention is shown in FIG. In the figure, W is the traveling direction of the paper, and the traveling side is FX.
The (fixing) side and the side to which the paper is fed are the SP (paper feed) side, which corresponds to the position of the suction unit 6 in the drawing of the conventional paper processing device shown in FIG. Further, in FIG. 1, reference numeral 15 is a suction belt, and a suction case (not shown) is provided on the back side of the suction belt 15 so as to adsorb and convey a sheet onto the surface of the belt 15 via the suction belt 15. The belt 15
Is configured such that the drive roller 14 is rotated as shown in FIG. 4 by a drive mechanism (not shown) provided on the back surface (R) side of the copying machine. The F side is the front side of the copying machine.

Next, the upper surface frame 17 of the suction unit 6 is provided with one or more protrusion passage holes 12 at appropriate positions between the suction belts 15 arranged in parallel. On the other hand, the base plate 11 is provided with a paper removing projection 13 that fits the passage hole 12, and the suction unit 6 is lowered to the paper jam removing position as shown by 6c in FIG. Only if the protrusion 13 as shown in FIG.
The tip end of the above protrudes above the upper surface frame 17. In this case, in the figure, the projection 13 has two plate-shaped ones, but the shape and quantity of the projections 13 are rod-shaped (rounded) as long as the intended purpose can be achieved. , Square, polygonal, etc.), plate-like, etc., and any mode such as arranging a plurality of them and arranging them in the same row can be appropriately adopted. In FIG. 1, the reference numeral 20 indicates that the copy paper being conveyed is peeled off without jamming and is FX.
It is a peeling detection actuator that detects the progress to the (fixing) side.

Next, the operation of the apparatus according to the embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a front view schematically showing a portion corresponding to a paper path at the time of black-and-white copying in the conventional example of FIG. 4 as an example showing a normal paper conveyance state, and is fed from the SP (paper feed) side. The copy paper passes through the black and white copy paper path 6a of the suction unit 6, and is fixed by the middle heat roller 7 and the lower heat roller 8 on the FX (fixing) side. In this case, the paper removing projections 13 are provided upright on the base plate 11 of the copying machine, but the suction unit 6 is provided as shown in FIG.
When it is at the position a, the tip does not project upward from the projection passage hole 12 (which is the side opposite to the paper surface in FIG. 2) provided in the upper surface frame 17 of the suction unit 6 shown in FIG. It should be of a size and shape.

Next, FIG. 3 shows an operation of removing the sheet 5 when a paper jam occurs. As in the case of FIG. 4 of the conventional example, the FX side of the suction unit 6 is placed on the copying machine as described above. This is to lower the level of the base plate 11 to the position of 6c.
3 is erected, and the tip end of the protrusion 13 projects from the protrusion passage hole 12 as described above and pushes up the sheet 5, so that even if the sheet 5 is sucked and closely attached to the suction belt 15, It is possible to raise the suction unit 6 from above, and the operator can remove the paper jam very simply by opening the front door of the copying machine and lowering the position of the suction unit 6 to 6c.

[0013]

As is apparent from the above description, according to the present invention, the paper processing device in the conventional copying machine is only slightly improved, and there is no difference in the process from the conventional one, which is unprecedented. It is possible to extremely effectively remove the paper jam, and it is also possible to suppress the contamination of the unfixed paper with the toner as much as possible, and the practical effect is immeasurable.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a paper carrying device of the present invention.

FIG. 2 is a front view schematically explaining the operation of the apparatus according to the embodiment of the present invention when there is no paper jam.

FIG. 3 is a front view schematically illustrating the operation of the apparatus according to the embodiment of the present invention when removing a paper jam.

FIG. 4 is a front view schematically showing the vicinity of a paper processing device of a conventional copying machine.

[Explanation of symbols]

 1 Photoconductor Drum 2 Development Part 3 Intermediate Photoconductor 4 Second Transfer Roller 5 Copy Paper 6 Suction Unit 7 Middle Heat Roller 8 Lower Heat Roller 9 Upper Heat Roller 10 Paper Ejection Roller 11 Base Plate 12 Projection Passing Hole 13 Removal Protrusion 14 Drive roller 15 Suction belt 16 Gap 17 Top frame 20 Peel detection actuator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kubo 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka

Claims (1)

[Claims] 1. A paper transporting mechanism of a copying machine using a suction unit, wherein at least one projection passage hole is provided in a suction unit upper surface frame between the suction belts arranged in parallel, and a jammed paper removing position is provided. A paper transporting device for a copying machine, wherein each of the holes is provided with a paper removing projection whose tip projects above the top surface of the suction unit only when the suction unit is lowered.