JPH07175348A - Transfer device for electrophotographic printing device - Google Patents

Abstract

PURPOSE:To eliminate the need of applying a high current to a motor at the time of driving without causing the trouble of generated heat and the heat of the motor itself by means of a control part by controlling to rotate a rotating means so that a transfer line may be positioned on a paper side when an image is transferred on the paper and it may be positioned away from the paper when the image is not transferred. CONSTITUTION:At the time of transferring, the side of a transfer cam 15 where a transfer line box 13 and the transfer line 14 exist is made higher than a transfer fixed plate 17 and a transfer guiding plate 18. The projecting part of the fixed plate 17 is allowed to abut and fixed in the depression of the cam 15. A transfer cam driving motor 28 is controlled by the control part 25 so as to interrupt a current when the projecting part of the fixed plate 17 abuts on the cam 15. When transfer is not performed, the other side of the cam 15 is made as high as the guiding plate 18 and the fixed plate 17. When the projecting part of the fixed plate 17 abuts on the fixed hole 16 of the cam 15, the current to the motor 28 is interrupted by the control part 25. Thus, the cam is controlled to be rotated so that the transfer line 14 may be positioned on the paper 1 side when the transfer is performed and it may be positioned away from the paper 1 when the transfer is not performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer device for an electrophotographic printer.

[0002]

2. Description of the Related Art FIG. 5 relates to a conventional electrophotographic printing apparatus,
FIG. 4 is a diagram mainly showing a transfer unit that transfers image data onto a sheet. FIG. 6 is a detailed view of a transfer section of the conventional electrophotographic printing apparatus during non-transfer, and FIG. 7 is a detailed view of the transfer section of the conventional electrophotographic printing apparatus during transfer.

Referring to FIGS. 5, 6 and 7, the sheet 1 passes under the transfer section 2 and the developing section 3 and the photosensitive drum 4 are provided.
The imaged data is transferred at. In the non-transfer state in FIG. 6, the sheet 1 passes through the lower sheet retainer 6 and the lower transfer plate 8. The paper 1 passes through the vicinity of the photosensitive drum 4 with a distance so as not to come into contact with the paper 1, and then passes through the upper transfer plate 7 and the upper paper retainer 5. One of the transfer plate rods 11 is connected to the transfer plate drive motor 12, and the other is connected to the ends of the upper transfer plate 7 and the lower transfer plate 8. In this case, no current is flowing through the transfer plate drive motor 12.

Next, in the case of transfer shown in FIG. 7, the sheet 1 is set as in the case of non-transfer shown in FIG. When the transfer plate drive motor 12 is driven, the lower transfer plate 8 and the upper transfer plate 7 are rotated about the transfer plate lower shaft 10 and the transfer plate upper shaft 9 via the transfer plate rod 11, respectively, and the paper 1 is transferred to the photosensitive drum. Contact 4. When the paper 1 is in contact with the photosensitive drum 4, the transfer line 1 stretched on the transfer line box 13
Image data written on the photosensitive drum 4 is transferred to the sheet 1 by applying a high voltage to the sheet 4. While the image data is being transferred onto the paper 1, a current constantly flows through the transfer plate drive motor 12 to maintain the transfer state.

[0005]

Since the transfer device of the conventional electrophotographic printing apparatus holds the transfer plate drive motor 12 in the drive state in order to maintain the transfer state, the transfer plate drive motor 12 is driven by the transfer plate drive motor 12. Heat is generated in the control unit, and heat is also generated in the transfer plate drive motor 12 itself. Further, the driving speed of the lower transfer plate 8 and the upper transfer plate 7 also has a great influence on the printing speed, and a large current needs to be passed during driving, which causes heat generation.

[0006]

A transfer device of an electrophotographic printing apparatus according to the present invention comprises a mounting means connected to a high-voltage power supply and linearly mounting a transfer line, and a mounting means for mounting an axis parallel to the transfer line. Rotating means rotatable about the center, guide means positioned in the front-rear direction with respect to the sheet traveling direction of the rotating means, and guiding means for guiding the sheet traveling, and the rotating means for not transferring the transfer line to the sheet side when transferring the sheet. And a control unit that controls to rotate to a position away from the sheet at the time of transfer.

Further, in the transfer device of the electrophotographic printing apparatus according to the present invention, the rotating means is provided with the mounting means, one of which is a transfer box having the transfer line therein, and the other of which is a circular cam. Is characterized by.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is an external view showing the configuration of an embodiment of the present invention. Referring to FIG. 1, the sheet 1 passes through the upper surface of the transfer guide plate 18 and the upper surface of the transfer fixing plate 17. The transfer guide plate 18 is fixed to a frame (not shown) by a transfer guide plate shaft 20. On the opposite side of the transfer guide plate 18, the transfer fixing plate 1
There is 7. The transfer fixing plate 17 is fixed to the frame by a transfer fixing plate shaft 19. The transfer cam 15 is mounted between the transfer guide plate 18 and the transfer fixing plate 17. The transfer cam 15 is provided with a transfer line box 13 having a transfer line 14 inside on one side. Transfer cam 1 on the side provided with transfer line box 13
5 is mounted slightly higher than the transfer guide plate 18 and the transfer fixing plate 17. The transfer cam 15 needs a height at which the paper 1 comes into contact with the photosensitive drum in order to transfer the image data onto the paper 1. A high voltage is applied to the transfer line 14 stretched in the transfer line box 13 provided on one side of the transfer cam 15, and the image data is transferred to the sheet 1. Transfer line 14
Is connected to the high voltage controller 23 via the high voltage line 22. The high voltage control unit 23 receives the control unit 25 via the signal line 24.
It is connected to the. The control unit 25 drives the transfer cam drive motor 28 via the transfer cam drive line 21. FIG. 1 shows the state of the transfer cam 15 at the time of transfer, and at the time of non-transfer, the transfer cam 15 rotates and the opposite side thereof is the transfer guide plate 1.
8 and the transfer fixing plate 17 have a round shape so as to have the same height. The sheet 1 passes through the round surface of the transfer cam 15 so as not to come into contact with the photosensitive drum.

Next, the transfer cam 15 will be described in more detail. FIG. 2 is an external view of the transfer cam 15 of this embodiment. Referring to FIG. 2 together with FIG. 1, the transfer cam 15 is provided with the transfer wire box 13 and the transfer wire 14 on one side. A transfer cam drive motor 28 is provided at the center of the transfer cam 15. The outer shape of the transfer cam 15 is a deformed circular shape, one of which has a shape higher than the transfer guide plate 18 and the transfer fixing plate 17, and the other of which has the same height. There is a fixing hole 16 on the other side of the transfer cam 15.

FIG. 3 is a diagram showing a state of the transfer cam 15 at the time of transfer, and FIG. 4 is a diagram showing a state of the transfer cam 15 at the time of non-transfer. Referring to FIG. 3 together with FIG. 1, at the time of transfer, the side of the transfer cam 15 on which the transfer line box 13 is located is higher than the transfer fixing plate 17 and the transfer guide plate 18. The convex portion of the transfer fixing plate 17 contacts and is fixed to the recess of the transfer cam 15. The transfer cam drive motor 28 cuts off the current when the convex portion of the transfer fixing plate 17 hits the transfer cam 15.
Controlled from 5.

Next, referring to FIG. 4 together with FIG. 1, the other side of the transfer cam 15 is the transfer guide plate 18 at the time of non-transfer.
And the same height as the transfer fixing plate 17. Transfer cam 1
The convex portion of the transfer fixing plate 17 is in contact with the fixing hole 16 on the other side of 5. In the transfer cam drive motor 28, when the convex portion of the transfer fixing plate 17 hits the fixing hole 16 of the transfer cam 15, the electric current is cut off by the control unit 25.

[0012]

As described above, according to the present invention,
It is connected to a high-voltage power supply and a transfer line is installed in a straight line, and this transfer line can be rotated around an axis parallel to the transfer line. By controlling the motor to rotate, it is not necessary to maintain the state where current continues to flow to the motor when the transfer line rotates, and the heat generated by the controller and the heat of the motor itself do not become a problem, and the motor is driven. Sometimes there is no need to pass a large current.

[Brief description of drawings]

FIG. 1 is an external view showing the configuration of an embodiment of the present invention.

FIG. 2 is an external view of a transfer cam according to this embodiment.

FIG. 3 is a diagram showing a state of a transfer cam during transfer.

FIG. 4 is a diagram showing a state of a transfer cam during non-transfer.

FIG. 5 is a diagram mainly illustrating a transfer unit that transfers image data onto a sheet of a conventional electrophotographic printing apparatus.

FIG. 6 is a detailed view of a transfer section of the conventional electrophotographic printing apparatus when not transferring.

FIG. 7 is a detailed view of a transfer section at the time of transfer of the conventional electrophotographic printing apparatus.

[Explanation of symbols]

 1 Paper 2 Transfer Section 3 Developing Device 4 Photosensitive Drum 5 Upper Paper Presser 6 Lower Paper Presser 7 Upper Transfer Plate 8 Lower Transfer Plate 9 Upper Transfer Plate Shaft 10 Lower Transfer Plate Shaft 11 Transfer Plate Rod 12 Transfer Plate Drive Motor 13 Transfer Line Box 14 transfer line 15 transfer cam 16 fixing hole 17 transfer fixing plate 18 transfer guide plate 19 transfer fixing plate shaft 20 transfer guide plate shaft 21 transfer cam drive line 22 high voltage line 23 high voltage control unit 24 signal line 25 control unit 28 transfer cam drive motor

Claims (2)

[Claims] 1. A mounting means connected to a high-voltage power supply for linearly mounting a transfer line, a rotating means capable of rotating the mounting means around an axis parallel to the transfer line, and a sheet traveling of the rotating means. And a control means for controlling the rotation means so as to rotate the transfer line to the paper side during the transfer of the paper and to a position away from the paper during the non-transfer of the paper. A transfer device for an electrophotographic printing apparatus, comprising: 2. The electrophotographic printing apparatus according to claim 1, wherein one of the rotating means includes the mounting means, which is a transfer box having the transfer line therein, and the other includes a circular cam. Equipment transfer device.