JPH06110278A - Electrophotographic device - Google Patents

Abstract

PURPOSE:To provide an inexpensive and small-sized electrophotographic device capable of removing paper erroneously fed. CONSTITUTION:When the paper is supplied from a paper feed part to a photosensitive drum 22 and becomes in a jammed state, a vertical carrying guide member 53 is opened first. Then, a fixing member 66 is turned to move a carrying guide member 64 from a position A0 to a position A1. Pressure between rollers, that is, between the driving roller 56b and the driven roller 56a of a carrying roller 56 is released and a paper feed path 52 gets in an open state where jamming processing is easily performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic apparatus,
In particular, the present invention relates to an electrophotographic apparatus used in, for example, a so-called U-turn paper feed type copying machine, a facsimile machine, a printer or the like in which a cassette is inserted from the front paper feed type or the paper discharge side.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a copying machine in which a paper feeding section for feeding stacked sheets of paper to an image processing section has a manual feeding function. In this copying machine, the paper is jammed (the paper stops in the accordion state) in the process of sending the paper from the paper feed section to the image processing section, and after the image processing, until the paper reaches the paper discharge tray. At that time, various measures have been taken to remove the paper.

Among them, in view of the fact that it is easy to remove the jammed paper, in general, as in the electrophotographic apparatus 1 shown in FIG. A so-called "clamshell type" structure has been put into practical use, in which the portion 4 is opened and closed vertically, a space for removing paper is secured near the paper feed path 5, and the jam position and the situation can be seen at a glance.

Further, in the copying machine 1 shown in FIG. 8, a paper feed roller 7 dedicated to manual bypass copying is provided outside the paper feed passage 5 for feeding paper from the cassette 6 to the image processing section 3, and the periphery of the paper feed passage 5 is provided. Is widened to secure a space for taking out the jammed paper near the registration roller 8.

[0005]

However, in the former technique, the image processing section 3 and the sheet feeding section 4 are structured to open and close in a clamshell shape with one end 2 as a rotation center. However, the cost is high due to the complicated structure, the need for a reinforcing structure, and the increase in the number of parts. In addition, the latter technique requires a large machine space and cannot save space.

Therefore, a main object of the present invention is to provide an electrophotographic apparatus which is low in cost and small in size and capable of easily removing a misprinted sheet.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a photoconductor, a paper feed means for accommodating a paper to be supplied to the photoconductor, a manual feeding means for manually feeding the paper to the photoconductor, and a paper feed to the photoconductor. And a driven roller that is disposed downstream of the first roller on the sheet feeding path and that is driven by the driving roller. An electrophotographic apparatus including a second roller including: a holding member to which the driven roller is attached; and an adjusting unit that acts on the holding member to adjust the relative position of the driven roller and the driving roller. It is an electrophotographic device.

[0008]

In the case of removing a paper sheet that has a paper feed error such as a jam in the paper feed passage near the first roller and the second roller, the adjusting member is operated to move the holding member. Then, the driven roller attached to the holding member also moves, the pressing of the driven roller against the drive roller is released, and the second roller is opened. Therefore, the space required for paper removal is secured, and the paper that has been misfeeded can be easily taken out.

[0009]

According to the present invention, it is possible to easily take out a misprinted sheet by operating the adjusting means, and to reduce the size of the apparatus at low cost. The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0010]

FIG. 1 shows the basic construction of a copying machine 10 which is an electrophotographic apparatus of this embodiment, and the concrete construction of essential parts is shown in FIG. The copying machine 10 includes an image processing unit 12. The image processing unit 12 includes a document table 1 on which a copy document is placed.
An exposure lamp 16 is fixed below the original table 14 including the exposure lamp 4. The light from the exposure lamp 16 is reflected by the mirror 18
Is reflected on the photoconductor drum 22 through the lens 20. The photoconductor drum 22 is charged by the charger 24, and an electrostatic latent image corresponding to the original image is formed on the surface of the photoconductor drum 22 by exposure. A developing unit 26 attaches a developer to the electrostatic latent image to form a visible image. Then, the developer attached to the photoconductor drum 22 is transferred by the transfer charger 28 onto a sheet supplied to the photoconductor drum 22 from a paper feed unit 38 (described later) arranged below the image processing unit 12. As a result, a normal image is formed. After that, the sheet is separated from the photoconductor drum 22 by the separating charger 30, and the conveying unit 3
It is conveyed to the fixing device 34 by 2. After the developer is fixed on the paper by the fixing device 34, the paper is discharged onto the tray 36.

Here, the paper feeding section 38 will be described. The paper feed unit 38 includes cassettes 40 and 4 in which paper is stored according to the copy mode and size (A4 horizontal, A4 vertical, B4, A3).
2, 44 and 46 are arranged in order from the top. And
The sheets of paper stored in the cassettes 40, 42, 44 and 46 are separated and taken out one by one by the pickup roller 48 and the corner claws 50, respectively, and the paper feed path 52
Be led to. Part of the paper feed path 52 is configured by the vertical conveyance guide member 53 shown in FIGS. Paper feed path 5
The sheet guided to the sheet 2 is fed to the conveying roller 56 required for conveying the sheet through the sheet feeding roller 54, and the conveying roller 56
From the registration roller 58 for correcting the skew of the paper
Is given to the photoconductor drum 22 via. Conveyor roller 5
Reference numeral 6 denotes a downstream side of the registration roller 58, which is arranged on a paper feed path 52 which guides the sheets taken out one by one from the cassettes 40, 42, 44 and 46 to the image processing section 12, and further has a manual feed table. It also has a roller function of guiding a sheet inserted from 60 (described later) to the image processing unit 12.

A manual feed table 60 is formed between the image processing unit 12 and the paper feeding unit 38, that is, on the side surface of the copying machine 10. As shown in FIG. 4, for example, the manual feed table 60 is formed in a foldable manner, and is formed so as not to project to the side from the vertical conveyance guide member 53 when not in use, that is, when the manual feed table 60 is folded. 10 is further miniaturized. Therefore, in the case of manually feeding the paper, as shown in FIG. 5, after the manual feeding table 60 is opened, the paper is inserted from the manual feeding table 60 and the photosensitive drum 22 is conveyed through the conveying roller 56 and the registration roller 58. Give to. In this way, the transport roller 56 and the registration roller 58 are connected to each cassette 4
It has a function of supplying the paper from the sheet 0, 42, 44 or 46 and the paper from the manual feed table 60 to the photoconductor drum 22, respectively.

With reference to FIGS. 2 and 3, the structure around the conveying roller 56 and the registration roller 58, which is a feature of the present invention, will be described in more detail. The transport roller 56 includes a driving roller 56a and a driven roller 56b, and the registration roller 58 includes rollers 58a and 58b. The bearing metal 62 of the roller 58a is rotatably supported by a conveyance guide member 64 for guiding the paper. A driven roller 56b is attached to the transport guide member 64. Transport guide member 6
4 rotates about the center of the bearing metal 62, that is, the center of the roller 58a.
By supporting 4 with the fixing member 66, the conveyance guide member 64 is arranged and fixed at the position A0. At this time,
The driven roller 56b is pressed against the drive roller 56a by the spring member 68 attached to the conveyance guide member 64.

The fixing member 66 is pivotally supported by a shaft 68. The shaft 68 is supported by a front frame and a rear frame (not shown) that axially support the front and rear sides of various rollers such as the photosensitive drum 22 and the registration roller 58. In addition, a hole 70 is formed in the fixing member 66, and one end of a torsion spring 72 is inserted into and supported by the hole 70. The other end of the torsion spring 72 is attached to a pin 74 that is planted in the front frame and the rear frame. Then, in the sheet feeding state, the torsion spring 72 causes the fixing member 66 to move to B0.
Then, the conveyance guide member 64 is fixed to the position A0 by being pressed and fixed to the position A.

On the other hand, at the time of jam processing due to a paper feed error, for example, the fixing member 66 is released from being fixed at the position B0 and is rotated to the position B1, and the conveyance guide member 64 is accordingly moved to the position A0. To A1 position. Therefore, the inter-roller pressure of the transport roller 56 is released, the space necessary for removing the jammed paper is secured, and the paper is easily taken out.

As described above, when the fixing member 66 rotates between the stopper pin 76 and the shaft core member 78 of the drive roller 56a, that is, in the range B in FIG. 3, the conveyance guide member 64 moves in the range A. It is rotated and set to either the paper feed state or the jam handling state. The image processing unit 1
The timing of feeding the paper to the second photosensitive drum 22 is determined by the actuator 82 of the photo sensor 80. When a sheet is inserted from the manual feed table 60, the switch 84 is actuated by pushing up the actuator 86 of the switch 84 including, for example, a micro switch, and it is detected that the manually processed sheet is processed by the image processing unit 12. To do.

The operation of the copying machine 10 thus constructed will be described. The paper fed from the cassettes 40, 42, 44 and 46 and the paper inserted from the manual feed table 60 are conveyed by the conveyance roller 56 arranged on the paper feed path 52.
After that, it is conveyed to the registration roller 58. At this point, a paper sheet that has a paper feed error, such as a jam, stays between the registration roller 58 and the transport roller 56. This paper is processed by the following procedure.

First, from the state shown in FIG. 5, the vertical conveying guide member 53 of the sheet feeding section 38 is opened as shown in FIG. 6 to access the sheet feeding path 54 between the conveying roller 56 and the registration roller 58. make it easier. Next, the transport guide member 64
The fixing member 66, which holds A at the position A0, is rotated to move the fixing member 66 from the position B0 to the position B1. Then, the conveyance guide member 64 released from the holding by the fixing member 66 rotates about the bearing metal 62 and comes to the position A1. Therefore, the inter-roller pressure between the drive roller 56a and the driven roller 56b of the transport roller 56 is canceled because the driven roller 56b moves together with the transport guide member 64. Therefore, the transport roller 58
The paper feed path 52 between the registration roller 56 and the registration roller 56 is in an open state where jam processing can be easily performed.

After the jam processing, the paper can be easily returned to the paper-passing state by the procedure reverse to the above.

[Brief description of drawings]

FIG. 1 is an illustrative view showing a basic configuration of an embodiment of the present invention.

FIG. 2 is an illustrative view showing a main part of this embodiment.

FIG. 3 is an illustrative view showing a main part of this embodiment.

FIG. 4 is an illustrative view showing a state where a manual feed table is folded.

FIG. 5 is an illustrative view showing a state in which a manual feed table is opened.

FIG. 6 is an illustrative view showing a state in which a vertical conveyance guide member is further opened.

FIG. 7 is an illustrative view showing a state where a conventional clamshell type copying machine is opened up and down.

FIG. 8 is an illustrative view showing another example of the conventional technique which is not the clamshell structure.

[Explanation of symbols]

 10 ... Copier 12 ... Image processing unit 22 ... Photosensitive drum 38 ... Paper feeding unit 54 ... Paper feeding passage 56 ... Conveying roller 56a ... Driving roller 56b ... Followed roller 58 ... Registration roller 60 ... Manual feed table 64 ... Conveying guide member 66 ... Fixing member

Claims (1)

[Claims] 1. A photoconductor, a paper feed means for accommodating paper to be supplied to the photoconductor, a manual feeding means for manually feeding the paper to the photoconductor, and a paper feed for feeding the paper to the photoconductor. A passage, a first roller disposed near the photoconductor on the paper feeding passage, and a first roller on the paper feeding passage.
In an electrophotographic apparatus including a second roller that is disposed downstream of the roller and includes a drive roller and a driven roller that is pressed by the drive roller, a holding member to which the driven roller is attached, and by acting on the holding member An electrophotographic apparatus comprising: adjusting means for adjusting a relative position between the driven roller and the driving roller.