JPH0475082A - Photosensitive paper carrying controller - 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 [Industrial Field of Application] The present invention relates to an image forming apparatus in which a roll of photosensitive paper is conveyed, cut into a predetermined length, and wound around a drum-like rotating body to form an image. The present invention relates to a photosensitive paper conveyance control device for a forming apparatus.

[Prior Art] Conventionally, this type of photosensitive paper conveyance control device had a configuration as shown in FIG.

A charger 2 and an exposure device 3 are arranged around a drum 1 rotatably supported in the center of the apparatus, and a developer tank 4 in which a developer is stored is provided below the drum 1. ing. In the developing tank 4, there are provided a developing electrode 5 facing the drum 1 and held at a predetermined interval, and a squeeze roller 6 rotatably supported in contact with the drum 1.

A cartridge 7 that can be pulled out toward the front is arranged on the upper right side of the drum 1, and inside the cartridge 7 is a roll-shaped photosensitive paper 8 that is rotatably supported, and a rotatable cartridge that sandwiches the photosensitive paper 8. A pair of paper feed rollers 9 and a paper feed guide 10 for guiding the photosensitive paper 8 toward the main body are provided. Further, a drive gear 12 arranged to mesh with a paper feed gear 11 fixed to the rear end of the paper feed roller 9 is fixed to a rotating shaft of a drive motor 13.

A cutter 14 is arranged between the main body side opening of the paper feed guide 10 and the drum 1, and a guide guide 16 having a jam sensor 15 is provided between the paper feed guide 10 and the cutter 14. Furthermore, a rotatably supported presser roller 18 is provided in contact with the drum 1 at the tip of the guide 17 provided between the cutter 14 and the drum 1 on the drum 1 side.

Further, a peeling claw 19 is provided on the lower right side of the drum 1 with one end in contact with the drum 1, and a drying fan 21 is arranged below a suction belt 20 provided close to the other end. A paper discharge tray 22 is provided at the end of the suction belt 20.
is located. The entire device is covered with a housing 23, the front of which is a door (not shown) that can be opened and closed.

FIG. 4 is a block diagram of the electric circuit. The drive motor 13 includes a drive circuit 25 for driving the drive motor 13.
is connected, and the drive circuit 25 is controlled by a control circuit 27 connected to the CPU 26. In addition, C
The signal from the jam sensor 15 is input to the PU 26 manually.

Next, this operation will be explained.

When the rotation of the photosensitive paper 8 supported in the cartridge 7 is transmitted from the drive gear 12 to the paper feed gear 11 by the operation of the drive motor 13, the photosensitive paper 8 is sequentially rotated as the paper feed roller 9 rotates. It is sent from the guide 16 to the drum 1 via the cutter 14, is pressed against the tram 1 by the presser roller 18, and is held on the drum 1 by a vacuum means (not shown). When the photosensitive paper 8 reaches a predetermined length, the cutter 14 cuts the photosensitive paper 8,
At the same time, the drive motor 13 stops.

The photosensitive paper 8 held on the drum 1 is charged by the charger 2 as the drum 1 rotates, and then exposed by the exposure device 3 to form an electrostatic latent image. The developer stored in the developer tank 4 is supplied to the developer electrode 5, and when the photosensitive paper 8 passes over the electrode 5, the electrostatic latent image is visualized. Next, after the excess developer remaining on the photosensitive paper 8 is removed by the squeeze roller 6, the photosensitive paper 8 is peeled off from the drum l by the peeling claw 9.

The photosensitive paper 8 peeled off from the drum 1 is attracted and conveyed by the suction belt 20, dried by the drying fan 21, and then conveyed to the paper discharge tray 22 to complete the image forming process.

[Problems to be Solved by the Invention] However, the position of the leading edge of the photosensitive paper after the image forming process is just before the cutter. Therefore, when the door is opened to replace the photosensitive paper and the cartridge of photosensitive paper is pulled out, there is a problem in that the leading edge of the photosensitive paper hits the supporting member of the guide.

Furthermore, even if the cartridge is not pulled out, the photosensitive paper protruding from the cartridge is exposed to light and no image is formed on that portion.

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 transport control device in which the photosensitive paper is always accommodated in the cartridge when the door of an image forming apparatus is opened. purpose.

[Means for Solving the Problems] In order to achieve this object, the photosensitive paper conveyance control device of the present invention includes a detection means for detecting that the door of the image forming apparatus is opened, and a detection means for conveying the photosensitive paper. reverse direction transport control means for operating the transport means in a direction opposite to the normal transport direction;
and a timer for operating the reverse direction conveyance control means for a predetermined period of time.

[Operations] In the present invention having the above configuration, the detection means detects that the door of the image forming apparatus is opened.

When the detection means detects that the door is opened, the reverse direction conveyance control means conveys the photosensitive paper in a direction opposite to the normal conveyance direction of the photosensitive paper, that is, from the drum-like rotating body to the photosensitive paper roll.

The timer measures the predetermined time and notifies the reverse transport control means of the operation time to set the operation time of the reverse transport control means to a predetermined time.

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

First, the overall structure of a wet type electrophotographic apparatus using a roll of photosensitive paper will be described with reference to FIGS. 1 and 2. FIG. 1 to 23 in the figure are the same as those in the conventional example, so the explanation will be omitted.

A switch 24 for detecting opening/closing of the door is provided on the main body side of a door (not shown) provided on the front surface of the main body. That is, in this embodiment, the switch 24 constitutes the detection means.

A drive circuit 25 for driving the drive motor 13 is connected to the drive motor 13, and the drive circuit 25 is connected to the CP
It is controlled by a control circuit 27 connected to U26, as in the conventional example.

A direction control circuit 28 is inserted between the drive circuit 25 and the control circuit 27, and controls the rotational direction of the drive motor 13 based on instructions from the CPU 26. That is, in this embodiment, the direction control circuit constitutes a reverse direction transport control circuit.

In addition to the signal from the jam sensor 15, signals from the switch 24 and the timer 29 are also input to the CPU 26. Signals from the switch 24 and the jam sensor 15 are input to the timer 29 . That is, in this embodiment, the timer 29 constitutes a timekeeping means.

Next, the operation of this embodiment will be explained.

The image forming process is the same as that of the conventional example, so a description thereof will be omitted.

After the image forming process is completed, when the front door is opened to remove paper jams, the switch 24 detects this and transmits this information to the timer 29 and CPU 26.

When the CPU 26 receives this information, it instructs the control circuit 27 and the direction control circuit 28 to rotate the drive motor 13 in the opposite direction to the normal transport direction in order to store the photosensitive paper 8 into the cartridge 7. , outputs the command. When the drive motor 13 starts rotating, the leading edge of the photosensitive paper 8 is still closer to the drum 1 than the jam sensor 15, but the rotation of the drive motor 13 causes the paper feed roller 9 to transport the photosensitive paper 8 toward the cartridge 7. When the jam starts, the jam sensor 15 is passed. At this time, the jam sensor 15 notifies the timer 29 that the leading edge of the photosensitive paper 8 has passed, and the timer 29 starts its operation.

After the timer 29 starts operating, a predetermined time t (sec
) has elapsed, the timer 29 transmits this to the CPO 26. The predetermined time t (
see) is expressed by the distance 1 (m) from the jam sensor 15 to the opening of the cartridge 7 and the peripheral speed v (m/5ee) of the paper feed roller 9 as follows.

t=l/v (see) After the predetermined time t (see) has elapsed, the CPU 26 stops the rotation of the drive motor 13.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, when the door of the image forming apparatus is opened, the leading edge of the photosensitive paper is stored in the cartridge, so there is no need to replace the photosensitive paper. This is easy to do and also prevents light from hitting the photosensitive paper.

[Brief explanation of the drawing]

1 to 2 show embodiments embodying the present invention. FIG. 1 is an overall configuration diagram, and FIG. 2 shows an embodiment of the present invention.
FIG. 2 is a block diagram of an electric circuit. 3 to 4 show a conventional example, in which FIG. 3 is an overall configuration diagram, and FIG. 4 is a block diagram of an electric circuit. In the figure, 24 is a switch, 28 is a direction control circuit, and 29 is a timer.

Claims (1)

[Claims] 1. Transporting a roll of photosensitive paper and cutting it into a predetermined length,
A photosensitive paper conveyance control device for an image forming apparatus that is wound around a drum-like rotating body to form an image includes a detection means for detecting that a door of the image forming apparatus is opened, and a conveyance means for conveying the photosensitive paper. What is claimed is: 1. A photosensitive paper conveyance control device comprising: a reverse conveyance control means for operating the reverse conveyance control means in a direction opposite to a normal conveyance direction; and a timer for operating the reverse conveyance control means for a predetermined period of time.