JPH0475950A - Photosensitive paper transport control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic image forming apparatus, and more particularly to a photosensitive paper conveyance control device that conveys and winds a sheet of photosensitive paper around a drum-shaped rotating body. Regarding.

[Prior Art] Conventionally, a photosensitive paper conveyance control device in an electrophotographic image forming apparatus has a configuration shown in FIG.

Photosensitive paper 1 stored in a roll is set in a cartridge/fuji 2, and its tip is connected to a first paper feed roller 3a.
, 3b.

A conveyance path is formed by a guide 4, and a paper position detection sensor 7, a cutter 5°, and second paper feed rollers 6a and 6b are arranged in this order from the paper cartridge side on the conveyance path. The conveyance path reaches on a tangent line near the drum 8. Inside the drum 8, there are tip suction holes 9 at the leading suction position and the final suction position of the photosensitive paper, respectively. and a rear end suction hole 10 are provided, and the distal end suction hole 9. The rear end suction hole 10 is connected to a suction pump 12 through a suction pipe 11.

FIG. 4 is a block diagram of the drive circuit. Center CPU
A signal from the paper position detection sensor 7 is input to the paper conveyance CPU 22 connected to the paper transport CPU 21 . Further, based on a command from the paper conveyance CPU 22, a first motor drive circuit 23 drives a first motor 24 connected to the first paper feed rollers 3a and 3b to the second paper feed roller. A second motor drive circuit 25 is connected to drive the second motor 26 connected to the second motor 6a6b, respectively.

Next, to explain the operation of the conventional example, the center 〇PU21
When an image forming command is output from
The transport CP is set so that the photosensitive paper 1 is transported at a speed equal to
U22 transmits a command to the first motor drive circuit 23 to rotate the first motor 24. When the leading edge of the photosensitive paper 1 reaches the paper position detection sensor 7, a detection signal is output from the sensor 7 to the paper conveyance CPU 22, and the CPU 22
motor 24 is stopped. Now, the conveyance path and drum 8
The point of contact with the Do
, and the distance between the contact point and the sensor 7 is L (m
) is 1, and the rotation speed of the drum 8 is R (rpm), then the position of the angle X° (counterclockwise) expressed as When the suction hole 9 reaches the first position, the first position is reached. Second paper feed roller 3a
, 3b, 6a, 6b are the circumferential speed V(
The photosensitive paper 1 is conveyed by rotating at a speed equal to (m/s). Thereby, the photosensitive paper 1 is positioned so that its leading position matches the position of the leading suction hole 9, and is wound around the drum 8. The conveying CPU 22 cuts the photosensitive paper 1 with the cutter 5 so that the photosensitive paper 1 has a predetermined length, and cuts the photosensitive paper 1 with the cutter 5,
3b is stopped, and when the rear end of the cut photosensitive paper 1 passes the position of the second paper feed rollers 6a, 6b, the second paper feed rollers 6a, 6b are stopped. In this manner, the rolled photosensitive paper 1 was wound around the drum 8.

[Problems to be Solved by the Invention] However, with a roll of photosensitive paper as a load, it is necessary to instantly accelerate the stopped paper feed roller to the same speed as the drum. If there are variations, accurate positioning cannot be performed. There is a problem in that accuracy is further reduced when the load on the remoter changes due to changes in the remaining amount of rolled photosensitive paper.

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a photosensitive paper conveyance control device that can accurately position the paper feeding position regardless of changes in the remaining amount of rolled photosensitive paper. With the goal.

[Means for Solving the Problems] In order to achieve this object, the photosensitive paper conveyance control device of the present invention transports the sheet-like photosensitive paper to the rotating body so that the sheet-like photosensitive paper and the rotating body rotate integrally. a pressing means for pressing the sheet-like photosensitive paper against the rotating body; a position detecting means for detecting the position of the leading edge of the sheet-like photosensitive paper on the rotating body; and a conveying means for conveying the sheet-like photosensitive paper to the rotating body, as necessary. and a photosensitive paper holding means for holding and releasing the sheet-like photosensitive paper accordingly.

[Function] In the photosensitive paper conveyance control device of the present invention configured as described above, the pressing means presses the sheet-like photosensitive paper against the rotating body so that the sheet-like photosensitive paper and the rotating body rotate integrally. . The position detection means detects the position of the leading end of the sheet-like photosensitive paper on the rotating body. The photosensitive paper holding means is included in the conveying means for conveying the sheet-like photosensitive paper to the rotating body, and holds and releases the sheet-like photosensitive paper as necessary.

[Example 1] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of this embodiment, and since 1 to 12 in the figure are the same as FIG. 3 showing the conventional example, their explanation will be omitted. FIG. 2 is a block diagram of the drive circuit, and since the numbers 21 to 26 and 7 in the figure are the same as those in FIG. 4 showing the conventional example, the explanation thereof will also be omitted.

Reference numeral 13 denotes a paper press roller, which can be moved between a position in contact with the drum 8 and a position away from it by a first solenoid drive circuit 29 and a first solenoid 30 connected to the paper conveyance CPU 22. It has a structure. That is,
In this embodiment, the paper pressing roller 13, the first solenoid drive circuit 29, and the first solenoid 30 constitute a pressing means.

14 is a second paper position detection sensor using a reflective photointerrupter, and the drum 8 of the paper pressing roller 13
They are arranged adjacent to each other in the direction of rotation. The second paper position detection sensor 14 is connected to the paper conveyance CPU 22, and when the leading edge position of the photosensitive paper 1 is detected, it is connected to the paper conveyance CPU 22.
It is transmitted to PU22. That is, in this example,
The paper position detection sensor 14 constitutes a position detection means.

The second paper feed roller 6a has a structure in which it can be moved by a second solenoid 28 between a position in which it comes into contact with the corresponding second paper feed roller 6b and a position in which it is separated from the corresponding second paper feed roller 6b. The photosensitive paper is held by contacting the photosensitive paper. The second solenoid 28 is a transport CPU 22
The second solenoid drive circuit 27 is connected to the second solenoid drive circuit 27 . That is, in this embodiment, the second paper feed rollers 5a and 6b, the second solenoid 28, the second solenoid drive circuit 27, the second motor drive circuit 25, and the second motor 26 hold the photosensitive paper. constitute means.

Next, the operation of this embodiment will be explained.

First, in a standby state, the drum 8 is stopped, and the second paper feed roller 6a is in contact with the second paper feed roller 6b in a normal state. Further, the paper pressing roller 13 is separated from the drum 8 in a normal state.

When an image forming command is output from the center CPU 21,
The drum 8 rotates and the first. Second paper feed roller 3a
, 3b, 6a, and 6b all rotate at a constant speed to convey the photosensitive paper l. When the leading edge of the photosensitive paper 1 passes the first paper position detection sensor 7 and the length from the leading edge of the photosensitive paper 1 to the cutter 5 reaches a predetermined length, the cutter 5 cuts the photosensitive paper 1, and the cutter 5 cuts the photosensitive paper 1. paper feed rollers 3a and 3b are stopped. Furthermore, the second paper feed rollers 6a and 6b rotate at a constant speed to convey the photosensitive paper 1, and when the leading edge of the photosensitive paper 1 reaches the position of the second paper position detection sensor 14, the second paper position detection sensor A detection signal is output from 14 to the conveying CPU 22, and the CPU 22
stops the second motor 26. At this time, the rear end of the photosensitive paper 1 is sandwiched between the second paper feed rollers 6a and 6b, and the leading edge of the photosensitive paper 1 is in contact with the drum 8 and moves on the drum 8. It's slipping.

The drum 8 rotates and the leading suction hole 9 is connected to the paper presser roller 13.
When it comes into contact with the drum 8 of
When the PU 22 recognizes this, the CPU 22 outputs a command to the first solenoid drive circuit 29, and the first solenoid 30
The paper pressing roller 13 is brought into contact with the drum 8 with the photosensitive paper 1 sandwiched therebetween. In addition, the suction pump 12 is activated, and the leading end of the photosensitive paper 1 is sucked into the drum 8 through the suction pipe 11 through the leading suction hole 9.
Fix and hold on top. At the same time, the paper conveyance CPU 22 also outputs a command to the second solenoid drive circuit 27,
The solenoid 28 separates the paper feed roller 6a from the photosensitive paper 1. The leading end of the photosensitive paper 1 is held by the suction hole 9 and is also pressed by the paper pressing roller 13, so that it rotates integrally with the drum 8.

The drum 8 rotates and the rear end suction hole 10 is connected to the paper presser roller 1.
When the paper conveying CPU 22 recognizes this, the CPU 22 outputs a command to the first solenoid drive circuit 29, and the first solenoid 3 comes into contact with the drum 8.
0 returns the paper pressing roller 13 to the normal state described above.

Further, the rear end of the photosensitive paper 1 is fixed and held on the drum 8 by the rear end suction hole 10. In this state, the photosensitive paper 1 is accurately placed in the tram 8.
is positioned at the winding position.

[Effects of the Invention] As is clear from the detailed description above, in the present invention, the photosensitive paper is positioned on the drum by sliding the photosensitive paper in contact with the drum after cutting the photosensitive paper. The paper is then placed on standby and the paper feeding position to the drum is adjusted.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a photosensitive paper transport control device according to an embodiment of the present invention, FIG. 2 is a block diagram of the same electric circuit, and FIG. 3 is a diagram of a conventional photosensitive paper transport control device. This is an overall configuration diagram, and FIG. 4 is a block diagram of the same conventional electric circuit. In the figure, 1 is photosensitive paper, 8 is a drum, 6a and 6b are second paper feed rollers, 13 is a paper press roller, 14 is a second position detection sensor, 25 is a second motor drive circuit, and 26 is a second 2
, 27 is the second solenoid drive circuit, 28 is the second solenoid, 29 is the first solenoid, and 30 is the first solenoid.
This is a solenoid.

Claims (1)

[Scope of Claims] 1. In a photosensitive paper transport control device that transports and wraps a sheet of photosensitive paper around a drum-shaped rotating body, the sheet of photosensitive paper and the rotating body rotate integrally, a pressing means for pressing the sheet-like photosensitive paper against the rotary body; a position detecting means for detecting the position of the leading end of the sheet-like photosensitive paper on the rotary body; and a conveyor for conveying the sheet-like photosensitive paper to the rotary body. A photosensitive paper conveyance control device comprising: a photosensitive paper holding means for holding and releasing the sheet-like photosensitive paper as necessary.