JPH0464546A - Photosensitive paper transport control device - Google Patents

Abstract

PURPOSE:To make accurate location in place on a rotor by furnishing a pressing means to cause a photosensitive sheet of paper to rotate in a single piece when the rotor rotates, providing a sensing means for the position of winding, and installing a sheet releasing means to release from the transport means when necessary. CONSTITUTION:A drum 8 is stopped at the angle at which a photosensitive sheet leading edge suction hole 9 comes to the position where a roller 101 contacts the drum 8 in the standby state. Feed rollers 3a, 3b, 7a, 7b transport a sheet 1 at the same speed as the drum 8 in conformity to an image form command, and when its leading edge is sensed by a sheet position sensor 104, an appropriate signal is issued to stop the feed rollers 3a, 3b, 7a, 7b, and the sheet 1 enwraps a sheet holder roller 101 and comes in contact with the drum 8, and the suction hole 9 holds fast the leading edge of the sheet 1 through the action of a suction pump 21. Then the feed rollers 3a, 7a are separated from the sheet 1, and the drum 8 is started rotating, and when the sheet 1 attains a specific length, it is cut by a cutter 6. When the trailing edge of the sheet reaches the sheet holder roller 101, the feed rollers 3a, 7a are returned so that the feed rollers 3b, 7b are contacted.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention involves transporting a sheet of photosensitive paper around a drum-shaped rotating body, winding it up, and applying a series of steps to the wound sheet of photosensitive paper. The present invention relates to a photosensitive paper conveyance control device in equipment that performs the above process, such as a copying machine.

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

A roll of photosensitive paper 1 is set in a cartridge 2, and its leading end is supported between paper feed rollers 3a and 3b. A conveyance path is formed by a guide 4, and a paper position detection sensor 5. The cutter 6 and paper feed rollers 7a and 7b are arranged in order from the paper cartridge side. The conveyance path is the drum 8
It has reached the near tangent line of . Inside the drum 8, suction holes 9 are provided at the leading suction position and the final suction position of the photosensitive paper.
．． and 10 are provided, and the suction holes 9° and 10 are 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 5 is input to a paper conveyance CPU 22 connected to the CPU 21 . Also, based on a command from the paper conveyance CPU 22, a motor drive circuit 23 drives a motor 24 connected to the paper feed rollers 3a, 3b, and a motor 26 connected to the paper feed rollers 7a, 7b. Circuits 25 are connected to each other so that they can be driven.

Next, to explain the operation of the conventional example, the center 〇pu21
When an image forming command is output from the paper feed roller 3a,
The paper transport CPU 2 transports the photosensitive paper 1 at a speed equal to the circumferential speed V [m/s] of the drum 8 when the drum 8 rotates at a constant speed.
2 transmits a command to the motor drive circuit 23, and the motor 24 rotates. When the leading edge of the photosensitive paper 1 reaches the paper position detection sensor 5, a detection signal is sent from the sensor 5 to the paper transport CPU.
22, and the paper transport CPU 22 stops the motor 24. Now, the contact point between the conveyance path and the drum 8 is Do in the counterclockwise direction based on the top of the drum 8, the distance between the contact point and the sensor 5 is L [m], and the rotational speed of the drum 8 is is R [rpm], X=D - (R/60) * 360 * (L/V)
When the leading position suction hole 9 reaches the position of the angle X' expressed by The paper conveying CPO 22 issues a command to the motor drive circuit 23.25 to rotate the motor 24.26, thereby conveying the photosensitive paper 1. Thereby, the photosensitive paper 1 is positioned so as to match the leading position or the position of the suction hole 9, and is wound around the drum 8. A cutter 6 cuts the photosensitive paper so that the photosensitive paper 1 has a predetermined length, and the paper feed rollers 3a and 3b are stopped by a command from the paper conveyance CPU 22.

The rear end of the cut photosensitive paper 1 is the paper feed roller 7a.

When the paper passes the position 7b, a stop command is output from the paper transport CPU 22, and the paper transport rollers 3a, 3b, 7a, and 7b stop. In this way, the roll of photosensitive paper 1 is transferred to the drum 8.
It was wrapped around.

[Problems to be Solved by the Invention] However, it is necessary to use a roll of photosensitive paper as a load to instantly accelerate a stopped paper feed roller to the same speed as a rotating drum-shaped rotating body. Accurate positioning cannot be achieved if the motor steps out or the acceleration time varies. When the remaining amount of photosensitive paper in the roll changes, the load changes, further causing a lack of accuracy. Therefore, there is a problem in that it is difficult to form an image at an accurate position on a sheet of photosensitive paper.

The present invention was made in order to solve the above-mentioned problems, and it is possible to position a sheet of photosensitive paper at an accurate position on a rotating drum-shaped body, and to position the sheet of photosensitive paper at an accurate position on the sheet of photosensitive paper. An object of the present invention is to provide a photosensitive paper conveyance control device capable of forming images.

[Means for Solving the Problems] In order to achieve this object, the photosensitive paper conveyance control device of the present invention is configured such that when the rotating body rotates, the sheet-like photosensitive paper also rotates integrally. a pressing means for pressing the sheet-like photosensitive paper against the rotary body; a position detecting means for detecting the winding position of the leading end of the sheet-like photosensitive paper on the rotary body; The present invention is characterized by comprising a photosensitive paper releasing means for releasing the sheet-like photosensitive paper from the conveying means for conveying it to the rotary body as necessary.

[Function] According to the photosensitive paper conveyance control device of the present invention having the above-described configuration, the pressing means presses the sheet-like photosensitive paper that has reached the sheet-like photosensitive paper supply position against the drum-like rotating body, so that the rotating body Even when rotating, the photosensitive paper rotates integrally with the rotating body and is fixed so that the winding position will not shift.

The position detecting means is disposed at a position where the photosensitive paper is to be wound around the drum-like rotating body, and detects when the photosensitive paper has reached the position.

When the photosensitive paper is pressed against the rotating body by the pressing means so as to be able to rotate integrally with the rotating body, the photosensitive paper releasing means releases the photosensitive paper so as not to prevent the photosensitive paper from rotating together with the rotating body. Release the paper transport means.

[Example] 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 5 in the figure are the same as those in FIG. 4 showing the conventional example, the explanation thereof will also be omitted.

Reference numeral 101 denotes a paper pressing roller, which is connected to a solenoid drive circuit 102 and a solenoid 1 connected to the paper conveying CPU 22.
03, it has a structure that allows it to move between a position in contact with the drum 8 and a position away from it. That is, in this embodiment, the paper pressing roller 101, the solenoid drive circuit 102, and the solenoid 103 constitute a pressing means.

Reference numeral 104 denotes a paper position detection sensor using a reflective photointerrupter, and is arranged adjacent to the paper pressing roller 101 in the rotational direction of the drum 8. The paper position detection sensor 104 is connected to the paper conveyance CPU 22, and when the leading edge position of the photosensitive paper 1 is detected, it is detected by the paper conveyance CPU 2.
2.

That is, in this embodiment, the paper position detection sensor 1
04 constitutes a position detection means.

Paper feed rollers 3a and 7a are connected to corresponding paper feed rollers 3b and 7b by solenoids 105 and 106.
It has a structure that allows it to move between a position where it contacts and a position where it separates. The solenoids 105 and 106 are connected to a common solenoid drive circuit 1 connected to the paper conveyance CPU 22.
Driven by 07. That is, in this embodiment, the paper feed rollers 3a, 7a, solenoids 105.10
6 and the solenoid drive circuit 107 constitute a photosensitive paper releasing means.

Next, the operation of this embodiment will be explained.

First, in a standby state, the drum 8 is stopped at an angle such that the photosensitive paper leading suction hole 9 comes into contact with the drum 8 of the paper pressing roller 101. Paper feed roller 3a.

7a is in contact with paper feed rollers 3b and 7b in a normal state. Further, the paper pressing roller 101 is separated from the drum 8 in a normal state.

When an image forming command is output from the center CPU 21,
The paper feed rollers 3a, 3b, 7a, and 7b all convey the photosensitive paper 1 at a speed equal to the circumferential speed V [m/s] of the drum 8 when it rotates at a constant speed. When the leading edge of the photosensitive paper 1 passes the paper position detection sensor 5 and reaches the position of the paper position detection sensor 104,
A detection signal is output from the sensor 104 to the paper transport CPU 22, and the paper transport CPU 22 stops the motors 24 and 26. In this state, the leading edge of the photosensitive paper 1 was accurately positioned at the winding position of the drum 8. This is the CPU for paper transport.
22, the paper conveyance CPU 22 outputs a command to the solenoid drive circuit 102, and the solenoid 103 moves the paper press roller 101 to the drum 8 with the photosensitive paper 1 sandwiched therebetween.
bring it into contact with.

Also, the suction pump 12 is activated, and the leading end of the photosensitive paper 1 is fixed and held on the drum 8 through the suction hole 9 through the suction pipe 11. Furthermore, after this, the paper conveyance CPU 22 also outputs a command to the solenoid drive circuit 107, and the solenoid 105.10
6 separates both the paper feed rollers 3a7a from the photosensitive paper 1.

After these operations, the drum 8 starts rotating and quickly reaches a circumferential speed of V [m/s], but the leading edge of the photosensitive paper 1 is held by the suction hole 9 and is also pressed by the paper presser roller 101. It rotates integrally with the drum 8. When the length from the leading edge of the photosensitive paper 8 to the cutter 6 reaches a predetermined length, the cutter 6 cuts the photosensitive paper 1. When the cut surface of the photosensitive paper 1, that is, the rear end of the cut sheet-like photosensitive paper 1, reaches the paper press roller 101, a command is again output from the paper conveyance CPU 22 to the solenoid drive circuits 102 and 107, and the paper press roller 101, paper feed roller 3a, and 7a all return to the normal state described above. In this manner, the rolled photosensitive paper 1 is wound around the drum 8.

[Effects of the Invention] As is clear from the detailed description above, in the present invention, it is only necessary to position the sheet-like photosensitive paper on the drum-like rotating body that is stopped, and it is sufficient to position the sheet-like photosensitive paper at an accurate position on the drum-like rotating body. It is possible to provide a photosensitive paper conveyance control device that can position a sheet of photosensitive paper without complicated control and form an image at an accurate position on the sheet of photosensitive paper.

[Brief explanation of the drawing]

1 to 2 show an embodiment embodying the present invention. FIG. 1 is an overall configuration diagram of a photosensitive paper conveyance control device, and FIG. 2 is a block diagram of an electric circuit. be. Third
4 to 4 show a conventional example. FIG. 3 is a diagram showing the overall configuration of a photosensitive paper conveyance control device, and FIG. 4 is a block diagram of an electric circuit. In the figure, 1 is photosensitive paper, 3a and 3b are paper feed rollers, 8 is a drum, 101 is a paper press roller, 102
103 is a solenoid, 104 is a paper position detection sensor, 105 and 106 are solenoids, and 107 is a solenoid drive circuit.

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, when the rotating body rotates, the sheet of photosensitive paper is also integrally a pressing means for pressing the sheet-like photosensitive paper against the rotary body so as to rotate; a position detecting means for detecting the winding position of the leading end of the wrapped sheet-like photosensitive paper on the rotary body; From a conveying means for conveying a sheet of photosensitive paper to the rotating body,
A photosensitive paper conveyance control device comprising: a photosensitive paper releasing means for releasing the sheet-like photosensitive paper as necessary.