JPS62209554A - Structure of recording paper conveyance part of copying machine of the like - Google Patents

Abstract

PURPOSE:To allow a user side to easily deal with jamming by permitting a fixing device, which can move in a direction where a recording paper is fed, to control the position of a conveyance frame fitting a transfer electrode, a separation electrode and a conveyance means. CONSTITUTION:Guide rails 12A and 12B in parallel with the direction where the recording paper X is fed are arranged on inner both sides of a device frame 1, and the fixing device 4 can move along the guide rails 12A and 12B in the direction where the recording paper is fed. A pair of pushing-up members 15A and 15B extending in the direction of the conveyance frame 3 is installed on the right side of the fixing device 4, and roller 16 positioned at the tips of the pushing-up members 15A and 15B faces cams 17 on both sides of the convey ance frame 3. Since the cams 17 are provided with a slope part 17a and a flat part 16b on the side of the fixing device 4, the conveyance frame 3 drops to the state shown by the virtual lines due to its weight when the roller 16 is engaged with the slope part 17a of the cams 17.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, and in particular to a structure for transporting recording paper onto which an image has been transferred by a carrier drum to a fixing device. Regarding improvements.

BACKGROUND OF THE INVENTION As is well known, in electrophotographic copying machines, there is a
It is desirable to have a structure that allows easy removal of jammed recording paper.

For this reason, conventionally, a recording paper conveyance section structure as shown in the third figure has been proposed. That is, in this structure, a transport frame D, which can be swung to the set position by a manual operation lever C, is supported by a support shaft d under an image carrier drum B, which is installed on the machine frame A. For D, conveyance means such as a transfer section guide plate E, transfer electrode F, separation electrode G, and conveyance bell (H) are attached. A fixing device J is positioned on the left side of this transport frame D, and is pulled out in a direction perpendicular to the paper surface of FIG.
is supplied from the transport frame D to the fixing device J.

Therefore, in such a conventional recording paper transport section structure,
If recording paper Therefore, the "jammed" recording paper X can be removed by inserting the tip of a finger into the same space from a direction perpendicular to the plane of the paper in FIG.

Problems to be Solved by the Invention - However, with this structure, when the size of the recording paper X used is long, this recording paper
When the recording paper X becomes jammed, it may not be possible to remove it easily.
is stopped from the entire top surface of the transport frame D to the inside of the fixing device aJ, so even if the transport frame D is lowered with the manual operation lever C, the left end is inside the fixing device J, so the same Recording paper X cannot be removed without tearing it.

For this reason, in the past, "the left end of the jammer recording paper X is left inside the fixing device J, a part of the recording paper is pulled out of the machine frame A and the remaining fragments of the recording paper Costs are getting higher.

The purpose of the present invention is to take into consideration the problems of the conventional recording paper conveyance structure as described above, and to provide a structure that allows long recording paper to be easily removed even if it becomes "jammed" inside the machine. There is something to be gained.

-Means for Solving the Problems- In order to achieve this object, the present invention disposes an electrode at the lower part of the image bearing drum supported by the machine frame, and transports the recording paper after the image has been transferred by a conveying means. In the structure of a recording paper conveyance unit of a copying machine or the like that supplies a fixing device, the fixing device is movable in the recording paper feeding direction by a guide rail, and the transfer unit guide plate and the conveyance means are assembled into a conveyance frame. is swingably supported with respect to the body frame by a support shaft at a position opposite to the fixing device with respect to the center position of the image carrier drum, and is engaged with a cam of the transport frame by a push-up member provided on the fixing device. It is proposed that the electrode be set at a predetermined transport position together with the transport frame.

One Embodiment - Hereinafter, details of an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 and 2, the illustrated example shows the main parts of a copying machine, which includes an image carrier drum 2 installed on a body frame 1, and a circumferential surface 2a of the image carrier drum 2. The image of the original is formed as an electrostatic latent image, this electrostatic latent image is developed by a developing device, and the developed image is transferred to the surface of the recording paper X that is fed toward the right in FIG. The X passes over a transport frame 3, the details of which will be described later, and is sent to a fixing device 4, where the image is fixed.

That is, disposed below the image carrier drum 2 is a transport frame 3 whose right end is supported by a support shaft 5 installed on the body frame 1. Above the right end of the transport frame 3, a transfer section guide plate 6 whose tip end 6a is pressed against both sides of the circumferential surface of the image carrier drum 2 is elastically supported by a leaf spring 7, and these transfer section guides Recording paper X is fed from the right side through the plates 6. Further, on the upper surface of the conveyance frame 3, there is a transfer electrode 8 for transferring the developed image on the circumferential surface of the image carrier drum 2 to the surface of the recording paper
A separation electrode 9 for separating the recording paper X from the circumferential surface of the recording paper X and a conveyance means for transporting the transferred recording paper X toward the fixing device 4 are arranged in this order along the paper feeding direction of the recording paper X. To be more specific,
In the case of the illustrated example, although not shown, the conveyance means includes a large number of vacuum suction holes 10 formed on the surface of a vacuum box incorporated inside the conveyance frame 3 and a plurality of conveyance bells) 1
1, the recording paper X on which the image has been transferred is moved toward the fixing device 4 by the conveying force of the conveying belt 11 while being attracted to the vacuum suction hole IO.

On the other hand, guide rails 12A and 12B parallel to the paper feeding direction of the recording paper
It can move in the paper feeding direction along A and 12B. For this movement, as shown in the second figure, a manual operation handle 13 is disposed on the front side of the machine frame l, and a link 14 engaged with this manual operation handle 13 allows the fixing device 4 to move the recording paper X. A movement operation is performed in the paper feeding direction. Further, a pair of push-up members 15A and 15B extending in the direction of the transport frame 3 are provided at the right end of the fixing device 4, and rollers 16 at the tips of these push-up members 15A and 15B are arranged on both sides of the transport frame 3. It faces the cam 17. These cams 17 are connected to the inclined surface portion 17a and the horizontal surface portion 1 on the side of the fixing device 4.
7b, when the roller 16 engages with the inclined surface portion 17a of the cam 17, the conveying frame 3 descends to the state shown by the imaginary line in FIG. 1 due to its own weight, and the roller 1
6 engages with the horizontal surface portion 17b of the cam 17, the conveyance frame 3 is in the set position shown by the solid line in FIG. The illustrated fixing device 4 is a fixing device of a known structure using a heating roller 18 and a pressure roller 19, and the pressure roller 19 is pressed against the heating roller 16 only during fixing.

Further, in the illustrated example, a paper discharge roller 20 is also built into the frame of the fixing device 4.

Since the illustrated embodiment has the above-described structure, when the copying machine is in operation, the transport frame 3 and the fixing device 4 are set at the position shown by the solid line in FIG. The copy image is transferred onto the surface of the supplied recording paper
After the image on the surface of recording paper X is fixed, it is taken out of the machine.

In addition, if the long recording paper
By simply operating the manual operation handle 13, the 'jammed' recording paper Since the device 4 moves in the direction away from the transport frame 3, the left end of the recording paper As the sheet descends under its own weight to the state shown by the imaginary line, a space is formed at the top of the transport frame 3 from which the jammed recording paper X can be removed. You can insert your fingertip into the 1-41 hole and pick out the recording paper X without tearing the recording paper X. Of course, it is possible to "jam" it. After processing, if the manual operation handle 13 is operated again to move the fixing device 4 toward the transport frame 3, the push-up members 15A, 15B and the cam 17
Since the transport frame 3 is automatically restored to the state shown by the solid line in FIG. 1, the copying operation can be quickly restored.

In the above embodiment, a structure in which the transfer section guide plate 6 is provided on the conveyance frame 3 has been described, but in the present invention, it is not necessarily necessary to attach the co-transfer section guide plate 6 to the conveyance frame 3.

In addition, in the above embodiment, regarding the separation electrode during transfer, “
Although it has been described as a structure that opens in the event of a jam, the present invention
A structure in which only the transfer electrodes are provided on the transport frame may be used.

Effects of the invention - As is clear from the above explanation, the transfer electrode, the separation electrode,
The position of the transport frame to which the transport means is attached is controlled by a fixing device that can move in the recording paper feeding direction, and when a jam occurs, simply operate the fixing device manually.

Since "jam" processing and recovery can be performed quickly and easily, this "jam" processing can be easily performed on the user side.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main parts of a copying machine to which the present invention is applied, and FIG. 2 is an exploded perspective view of the main parts of the copying machine. FIG. 3 is a sectional view of a conventional copying machine. X... Recording paper. 1... Body frame, 2... Image carrier drum, 3... Transport frame, 4... Fixing device, 8... Transfer electrode, 9... Separation electrode, 12A, 12B... guide rail. 15A, 15B... Push-up members. 17...cam.

Claims (1)

[Scope of Claims] 1) A recording paper conveyance unit of a copying machine, etc., in which an electrode is disposed at the lower part of an image carrier drum supported by a machine frame, and the recording paper after image transfer is supplied to a fixing device by a conveyance means. In the structure, the fixing device is movable in the feeding direction of the recording paper by a guide rail, and the conveying frame to which the transfer section guide plate and the conveying means are assembled is aligned with the center position of the image bearing drum and the fixing device is movable in the recording paper feeding direction by a guide rail. At a position on the opposite side of the device, the electrode is supported swingably with respect to the machine frame by a support shaft, and is engaged with the cam of the transport frame by a push-up member provided on the fixing device to set the electrode together with the transport frame at a predetermined transport position. A structure of a recording paper conveying section of a copying machine, etc., characterized by the following.