JPS63286860A - Paper carrying device - Google Patents

Abstract

PURPOSE:To easily settle a paper jam, by providing a pressure-contact releasing lever which releases a driven roller from a state where the roller is pressure- contacted with a driving roller at the timing of opening an upper frame. CONSTITUTION:When an upper frame 17 is opened in the opposite way, the projecting part 32 of a pressure-contact releasing lever 31 is opened and projected from a lower frame 11 and the upper part of the lever 31 moves in the pulling direction of a tension spring 35 around a fulcrum 34. Since, in such state, the engaging part 33 of the pressure-contact releasing lever 31 is engaged with the supported shaft 15a of a paper carrying driven roller 15 and further pushed in the opposite direction with the shaft 15a working as a lever, the driven roller 15 which is pressure-contacted with a driving roller 14 by means of a pressure-contact spring 36 is automatically separated from the driving roller 14. Therefore, a paper cassette, etc., housed in a paper housing part 12 is pulled out leftward under such condition. Accordingly paper 23' jamming in a bent paper running path part 13 can be removed easily, and thus, paper jam settlement can be made easily.

Description

[Detailed Description of the Invention] [Summary] The present invention is a paper transport device incorporated in a laser printer, an electronic copying machine, etc., in which a paper running path is provided on the dividing surface of a lower frame and an upper frame that are divided into openable and closable parts. In a device configuration in which a drive roller for paper conveyance and a driven roller are disposed facing each other in the paper running path of a lower frame that communicates with the paper running path, the driven roller is moved relative to the driving roller in conjunction with the opening operation of the upper frame. A pressure-contact release lever is provided to release the pressure-contact, thereby facilitating workability in clearing paper jams on the paper travel path in the lower frame.

[Industrial application field]

The present invention relates to improvements in paper conveyance devices incorporated in laser printers, electronic copying machines, etc., and more specifically, the present invention relates to improvements in paper conveyance devices incorporated in laser printers, electronic copying machines, etc. The present invention relates to a paper conveyance structure that facilitates paper jam processing (jam processing) on a paper travel path in an image forming apparatus, an image reading apparatus, or the like.

Recently, in electrophotographic image forming devices such as laser printers and copiers, or optical image reading devices,
There is a need for a configuration that facilitates jam removal and other maintenance in the paper travel path of the device. Accordingly, the lower frame and upper frame in these devices, each having a paper running path, are divided into two by the main paper running path that communicates with each of these paper running paths, and the upper frame is separated from the lower frame. This has been solved by configuring the frame to be openable and closable, but it is still difficult to clear jams in areas of the paper running path that cannot be easily divided, especially in areas where the paper running path bends. There is a need for an apparatus configuration that can easily and conveniently handle paper jams.

[Conventional technology]

A conventional apparatus having a paper transport mechanism, for example, an electrophotographic image forming apparatus, as shown in the conceptual schematic diagram of FIG.
A photosensitive drum 18 and a photosensitive drum 1 are attached to a lower frame 11 in which a paper conveyance driving roller 14 and a paper conveyance driven roller 15 are disposed facing each other in a paper traveling path section work 3 that is bent.
A developing unit 19 and a fixing unit 20 are disposed opposite to each other with a predetermined gap from the upper frame 17 with a paper running path 21 therebetween, and are configured to be openable and closable via a hinge unit 22.

However, during image processing in such an apparatus, the paper 23 from the paper storage section 12 is rotated by the paper conveyance drive roller 14 and the push-contact driven roller 15 in the bent paper travel path section 13, so that the paper 23 is transferred to the lower frame 11. After the visible image formed on the photosensitive drum 18 is transferred to the image transfer section via the main paper running path 21 formed between the upper frame 17 and the upper frame 17, the paper is transferred to the image transfer section 21 by thermocompression bonding or the like at the fixing section 20. The transferred image is fixed on the paper 23 to form a desired image.

[Problem that the invention seeks to solve]

By the way, in an apparatus having such a conventional paper transport mechanism, for example, the running paper 2 is placed on the main paper running path 21.
3 causes a paper jam, the jam can be easily cleared by lifting and opening the upper frame 17 relative to the lower frame 11 via the hinge part 22. When the traveling paper 23 causes a paper jam in the curved paper traveling path portion 13 where the paper conveyance drive roller 4 and the push-contact driven roller 5 are disposed facing each other,
The path portion 13 is bent, and the driven roller 5 is in pressure contact with the paper conveyance drive roller 4 due to the pressure spring 1.
6 makes it difficult to clear the jam due to the fact that it is constantly pressed.

Therefore, in order to solve the above-mentioned problem, as shown in the schematic diagram of FIG. When a paper jam occurs in the bent paper travel path portion 13, first open the upper frame 17 to the lower frame 11 as shown in the figure, and then open the lower frame 11. The separation/opening portion 31 including the pressure-contact driven roller 5 on the side is opened as shown in the figure to facilitate jam disposal.

However, the separation/release portion 31 including the pressure-contact driven roller 15
If the structure is configured to be openable and closable, there is a drawback that the mechanism of the bending paper running path section 13 that causes the paper 23 to run in reverse becomes extremely complicated.

In view of the above-mentioned conventional problems, the present invention simplifies the mechanism in the bending paper travel path portion where the paper conveyance drive roller and pressure-contact driven roller of the lower frame of the apparatus face each other, and opens the upper frame upward. At the same time, the pressure of the pressure-contact driven roller against the paper conveyance drive roller, which is disposed opposite to each other across the curved paper travel path, is automatically released.
removing paper jams in the curved paper travel path;
That is, it is an object of the present invention to provide a novel paper conveyance device that facilitates jam handling.

Means for Solving Problem c] In order to achieve the above-mentioned object, the present invention provides a paper running path on the dividing surface of the lower frame and the upper frame, which are divided into openable and closable parts, and a lower part communicating with the paper running path. In a paper transport device in which a drive port for transporting paper and a driven roller are disposed facing each other in a paper running path of a frame, the driven roller is released from pressure contact with the drive roller in conjunction with the opening operation of the upper frame. The configuration includes a release lever.

[Effect]

In the paper conveyance device of the present invention, when the upper frame is in the closed state, the pressure driven roller comes into contact with the paper conveyance drive roller that is disposed opposite to the curved paper travel path, and When the upper frame is reversely opened, the pressure of the pressure-contact driven roller against the paper conveyance drive roller, which is disposed opposite to each other across the curved paper travel path, is automatically released, so that the curved paper travel path is automatically released. Partial jam clearance (paper jam removal process)
becomes easier.

〔Example〕

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

FIG. 1 is a schematic structural diagram of the main parts conceptually showing an example in which an embodiment of the paper conveyance device according to the present invention is applied to an electrophotographic image forming apparatus. Note that parts having the same functions as those in FIG. 3 are given the same reference numerals.

As shown in the figure, in this embodiment, in the lower frame 11 of, for example, an electrophotographic image processing apparatus, the upper frame 17 is configured to be openable and closable so as to divide a part of the main paper running path 21 into upper and lower parts. A press-contact driven roller 15, which is disposed opposite to the paper conveyance drive roller 14 with the bent paper travel path portion 13 in between, is movable in the direction in which the drive roller 14 is disposed by means of a long bearing (not shown), etc., with its support shaft 15a. , and when the support shaft 15a is pressed by the pressure spring 36 and the normal upper frame 17 is closed,
The driven roller 15 is in a pressed state against the drive roller 14.

Further, on the driven roller 15, a pressure release lever 31 having a retaining portion 33 that engages with the supporting shaft 15a and a protruding portion 32 that projects from the lower frame 11 toward the upper frame 17 swings about a supporting point 34. The tension spring 35 is movably provided.
The structure is such that a tensile force is applied in the direction in which the drive roller 14 is arranged.

When the upper frame 17 of such a device is closed, the upper frame 17 presses the protrusion 32 so that the engaging portion 33 of the pressure release lever 31
moves toward the drive roller 14 around the fulcrum 34, and there is no interference with the support shaft 15a of the pressure driven roller 15, and the driven roller is biased by the pressure spring 36 toward the opposing drive roller. Pressed.

Further, when the upper frame 17 is opened in the opposite direction as shown in FIG.
The upper part moves about the fulcrum 34 in the direction in which the tension spring 35 is pulled.

At this time, the engaging portion 33 of the pressure release lever 31 is engaged with the support shaft 15a of the paper conveyance driven roller 15, and furthermore, the support shaft 15a of the paper conveyance driven roller 15
5a is pressed in the opposite direction by the action of the lever, the driven roller 15, which is pressed against the driving roller 14 by the pressing spring 36, is automatically separated.

Therefore, in this state, for example, by pulling out a paper cassette or the like stored in the paper storage section 12 in the left direction toward the plane of the drawing, the bent paper running path portion 13
It is possible to easily remove the jammed paper, that is, the jammed paper 23°, that is, to dispose of the jam in a timely manner.

In the above embodiments, an example has been described in which an electrophotographic image forming apparatus is used, but the present invention is not limited to this example. For example, the present invention is not limited to this example. It can also be applied to various paper conveyance devices, etc., in which the upper frame can be opened and closed in a manner that divides a part of the main paper travel path into two parts relative to the lower frame, and the same effect can be achieved. can get.

〔Effect of the invention〕

As is clear from the above description, according to the paper conveyance device according to the present invention, the mechanism in the curved paper travel path portion where the paper conveyance drive roller and the pressure driven roller of the lower frame face each other is simplified, and At the same time as opening the upper frame with respect to the lower frame, it is possible to automatically separate the pressure-contact driven roller which is placed in a pressing state and opposed to the paper conveyance drive roller across the bent paper travel path, Process for removing paper jams in the curved paper travel path (
It has the excellent advantage that jam processing) is facilitated.

Therefore, it is extremely advantageous to apply this type of paper transport mechanism or a device incorporating a paper transport device.

[Brief explanation of the drawing]

FIG. 1 is an enlarged side view of main parts when the paper conveyance device according to the present invention is applied to an electrophotographic image forming apparatus, and FIG. 2 is for explaining jam handling of the paper conveyance device shown in FIG. 1. Fig. 3 is a schematic configuration diagram of main parts for explaining an example of a conventional paper transport device using an electrophotographic image forming apparatus; Fig. 4 is a paper transport system shown in Fig. 3. FIG. 2 is a schematic configuration diagram of main parts for explaining jam processing of the device. In FIGS. 1 and 2, 11 is a lower frame, 12 is a paper storage section, 13 is a curved paper travel path, 14 is a drive roller, 15 is a driven roller,
15a is a support shaft, 17 is an upper frame, 21 is a main paper traveling path, 23 is paper, 23' is a jammed paper, 31 is a pressure release lever, 32 is a protrusion, 33 is an engaging part, 34 is a fulcrum, 35 is a tension spring, and 36 is a pressure spring. I-Shimuru-ri Ewat+
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Claims (1)

[Claims] A paper running path (21) is formed on a dividing surface between a lower frame (11) and an upper frame (17) that are divided into openable and closable parts,
A lower frame (11) communicating with the paper running path (21)
A drive roller (1) for paper transport is installed on the paper travel path (13)
4) and a driven roller (15) are arranged to face each other, a pressure release lever ( 31).