JPH0716665Y2 - Electrostatic recording device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electrostatic recording device such as an electrophotographic copying machine, a facsimile, and a printer. In particular, the present invention relates to a device of a type in which a sheet of paper wound in a roll is cut into a sheet of a predetermined length and recording is performed on the sheet of sheet.

2. Description of the Related Art In the electrostatic recording apparatus described above, there is an electrophotographic copying machine whose mechanism is shown in FIG. In the figure, a plurality of (two in the figure) roll papers 13 and 14 are provided at the bottom of the apparatus. The roll paper is provided with a first paper feed roller 103. By selecting and driving these paper feed rollers, either the roll paper 13 or the roll paper 14 is selected and wound around them. The paper that is stuck to the cutter 15 and the second
The sheet is conveyed to the sheet feeding roller 104. When the sheet that has been conveyed by the second paper feed roller 104 is conveyed to a predetermined length, the cutter 15 operates and the sheet is cut.

The second paper feeding roller 104 transfers the paper cut by the cutter 15 or the paper conveyed without being cut by the cutter 15 when the predetermined cut length of the paper is long, to the drum-shaped photoconductor 30 and the transfer charger. Delivery to and from 17.

Around the photoreceptor 30, a charger 9, an exposure device 31,
Developing device 11, transfer charger 17, separation charger 1
8, a separation belt 6, a cleaning device 22, and a charge eliminating charger 8 are provided. The exposure device 31 has a fluorescent lamp 1, reflecting mirrors 3, 4, 10 and an in-mirror lens 2, and is an image of a document which is inserted from a document table T and discharged to a document tray Q via a conveyance roller R. The light image of is guided on the surface of the photoconductor 30 as indicated by the chain line L.

When the exposure device 31 performs image exposure on the surface of the photoconductor 30 uniformly charged by the charging charger 9,
An electrostatic latent image is formed on the photoconductor 30. Toner is supplied to the latent image from the developing device 11 to form the latent image into a visible toner image.

This toner image is superposed on the sheet cut into sheets by the cutter 15, and is transferred onto the sheet by the discharge of the transfer charger 17. After that, the paper is separated from the photoconductor 30 under the discharge of the separation charger 18, further carried by the separation belt 6, then sandwiched by the fixing gripper 19 and carried by the belt 32 to the fixing device 20, and the toner is discharged. The image is fixed on the paper. After that, the paper is discharged to the paper discharge tray S via the transport system PT.

In the above electrostatic recording device, when the paper sent from the roll paper 13 or 14 is jammed and causes a so-called jam, the jam paper must be pulled out of the device. At that time, the conventional device had the following disadvantages.

The user does not know whether the roll paper 13 or 14 was being fed when the paper jam occurred, that is, whether the paper was cut by the cutter 15 or before. If the jammed paper is to be pulled out from the cleaning device 22, if the paper is not yet cut and is connected to the roll papers 13 and 14, the load becomes considerably heavy and the conveyance roller 104 The paper may be torn around the area, which may make removal of the paper troublesome.

It is also conceivable to move the entire sheet feeding unit 23 to the left side in the figure and then pull out the residual sheet toward the sheet feeding unit side. However, in this case, the toner attached to the sheet is further transferred and attached to the conveying roller 104, which causes a change in the outer diameter and the friction coefficient of the roller. As a result, the linear velocity of the paper changes, increasing the magnification error in the paper feed direction,
The paper may meander and cause image distortion.

In order to reduce the load at the time of taking out the jammed paper by separating the jammed paper from the roll papers 13 and 14, it is possible to manually operate the cutter 15 to cut the paper before taking out the jammed paper. However, the cutter 15 in the conventional electrostatic recording apparatus is set so as to cut the sheet in the conveying state at a right angle to the conveying direction, and thus when the sheet in the stopped state is cut by a manual operation. Has a possibility that the leading edge of the sheet is obliquely cut and the sheet edge of the sheet which is a copy product (so-called copy) is not aligned, or the fixing gripper 19 is pinched.

In view of the above points, an object of the present invention is to facilitate removal of jammed paper in an electrostatic recording device of the type that uses roll paper.

The present invention that achieves the above-mentioned object is a roll-shaped sheet, sheet feeding means for conveying the sheet, and a cutter for cutting the sheet conveyed by the sheet feeding means substantially at right angles to the conveying direction. An electrostatic recording device having components such as a paper passage detecting means for detecting that the paper is passing the cutting position of the cutter and a paper jam detecting means for detecting paper jam on the downstream side of the cutter. Then, when the paper jam detector detects a paper jam while the paper is passing the cutting position of the cutter by the paper passage detector, the paper conveyance by the paper feeder is continued until a predetermined time elapses. ,
After that, the electrostatic recording apparatus controls each of the components so that the sheet is cut by the cutter and then the sheet feeding unit is stopped.

Hereinafter, the present invention will be described based on examples.

Since the mechanical structure of the electrostatic recording apparatus according to the present invention can be the structure shown in FIG. 4, the one shown in FIG. 4 is adopted again as an embodiment. In this embodiment, the operation of each mechanical element is controlled by the control device 34 having a built-in microcomputer.

The above-described first paper feed roller 103 starts rotation based on a paper feed start signal sent from the control device 34 and sends out paper. A counter is provided inside the control device 34, and counts the time from when the paper feed start signal is generated, that is, from the start of the paper feed by the first paper feed roller 103.
Paper that is fed is conveyed normally without jamming,
During that time, when the count value by the counter is counted up to a predetermined value (cut value), a paper cut signal is sent from the control device 34, and the cutter 15 is operated based on this to cut the paper. . The copying process performed on the cut paper has already been described and will not be described.

The paper sent out from the roll papers 13 and 14 may cause a jam in some cases. There are several methods for detecting whether or not a jam has occurred. In this embodiment, the downstream position of the second sheet feeding roller 104, the position immediately upstream of the transfer charger 17, the inside of the conveyor belt 6 and the defining device.
Paper detection sensors 35, 36, 37, 3 at positions immediately downstream of 20
8 is provided, and even if the count value from the paper feed start signal by the counter in the control device 34 exceeds a predetermined value, each sensor 35, 3
If the paper is not detected by 6,37, it is determined that a jam has occurred on the front side of each sensor.

When a jam occurs, the control device 34 performs the control as shown in FIG. That is, when a jam is detected by the sensors 35, 36, 37, 38, first, the drive sources other than the paper feed section, that is, the first and second paper feed rollers 103, 104 are stopped. After that, it is determined whether or not the jam occurs when the paper length is being counted, that is, whether the jam has occurred before the end of the paper cutting. Before the paper is stopped, a paper cut signal is generated to cut the paper, and then the driving of the paper feed unit is stopped.

In this way, when a jam occurs, the drive system is always stopped after cutting the paper, so when the user takes out the jammed paper, the jammed paper is always cut off from the roll paper, Is easy. Further, since the paper cutting in this case is performed during the transportation of the roll paper, the leading end of the roll paper is not obliquely cut off, so that no trouble occurs in the next copying operation.

In the above embodiment, the time from the start of the sheet to the end of the sheet cutting is detected by the counter that starts counting by the sheet feed start signal. However, instead of this, the counting is started from the counter value corresponding to the distance from the cutter 15 to the sensor 35 (a new sensor may be newly provided) arranged downstream of this cutter 15, and this is set to a predetermined value. It is also possible to generate a paper cut signal when it reaches. As another method, a method of starting counting based on a paper feed start signal on the upstream side of the sensor 35 and counting based on a count value corresponding to the distance from the cutter 15 to the sensor 35 on the downstream side of the sensor 35 Can also be taken.

Also, when the cutter 15 is operated in response to the occurrence of a jam, if the cutter 15 is activated immediately after the occurrence of a jam, it may be difficult to take out the cut jammed paper when the length is short. Conceivable. In order to avoid this, it is advisable to issue a paper cut signal when the count value of the counter exceeds a certain value.

As described above, when the paper is cut after a certain amount of paper is conveyed after the jam has occurred, it is convenient to perform the following control so as not to increase the damage of the jammed paper. That is, when a jam occurs in the fixing device 20 or later, the driving of each device on the downstream side of the fixing device 20 is stopped, but the driving of each device on the upstream side of the fixing device 20 continues for a while. As a result, the paper is only fed between the photoconductor 30 and the fixing device 20, and is not fed to the fixing device 20 and the subsequent positions where the jam occurs. Therefore, the damage of the jammed paper is not increased. Further, when a paper sheet enters the cleaning device 22 while being wound around the photoconductor 30 due to a separation error caused by the separation charger 18 and a jam occurs, driving of the photoconductor 30, transfer / separation charger 17, The energization of 18 and the drive of each device after the fixing device 20 are stopped, but the drive of each device on the upstream side is not stopped,
Paper is fed between the photoconductor 30 and the fixing device 20. In this way, it is possible to prevent the degree of jamming from increasing due to the progress of the sheet required for cutting the sheet. The above control flow is shown in FIG. Note that the route shown by the broken line in FIG. 2 is a flow in which the cutter 15 is directly operated without stopping the conveyance drive because the tip of the roll paper may be cut diagonally anyway.

By the way, when a jam occurs on the upstream side of the photoconductor 30, the jammed paper cannot be fed between the photoconductor 30 and the fixing device 20. That is, the second paper feed roller 104
When a jam occurs on the upstream side of the sheet, there is no space for advancing the sheet for cutting the sheet, and therefore the sheet is not conveyed even if it is fed by the second sheet feeding roller 104 immediately after the cutter 15. Therefore, when the jam on the upstream side of the second paper feed roller 104 is the primary cause, the paper substantially stops even if the feeding drive system is not stopped. Will cut into. Therefore, in this case, the cutter 15 can be operated at the same time when the driving of the entire transport system is stopped. However, in this case, the leading edge of the roll paper is left to be cut obliquely, and if it remains as it is, it interferes with the next copying process. Therefore, it is convenient to take the following measures.

In a general electrophotographic copying machine, when the jam reset switch is pressed after the jam processing is completed, the "Ready to copy" display on the operation panel installed at the designated place Is displayed), and thereafter, when the user presses a predetermined copy start button, the printing operation is restarted. However, as described above, if the leading edge of the roll paper remains cut obliquely, the printing process cannot be executed normally. To avoid this, by pressing the jam reset switch before the "Ready to copy" indicator lights up, the paper is fed once and the trailing edge of the paper is cut at a right angle by the cutter 15. ”Display.

It should be noted that it is awkward to treat the above-mentioned sheet with the obliquely cut tip as in the case of other normal cut sheets. For this reason, in order to make them immediately distinguishable, the light beam L of the optical device 31 is not output, the bias voltage of the developing device 11 is not applied, or the transfer / transfer No voltage is applied to the separation chargers 17 and 18 to prevent the toner from being transferred from the photoconductor 30 to the paper. Further, the size may be smaller than the smallest standard size that can be copied.

Although the present invention is applied to the electrophotographic copying machine in the above embodiment, the present invention can also be applied to a printer as shown in FIG. This printer differs from the copying machine shown in FIG. 4 in the following points. That is, three rolls of paper (53,5
4, 55) provided individually with a cutter 15 and sensors 35, 36, with a registration roller 213 that conveys a sheet to the photoconductor 30 like the first paper feed roller 103, and replaces the optical device 31. Laser exposure apparatus 200 is provided. The same reference numerals in FIGS. 3 and 4 represent the same members.

Effects According to the present invention, the jam paper is always cut and separated from the roll paper, and the length of the cut jam paper is a size convenient for taking out the jam paper, so that the jam treatment is significantly facilitated.

[Brief description of drawings]

FIG. 1 is a flow chart showing one control example of the electrostatic recording apparatus according to this embodiment, FIG. 2 is a flow chart showing another control example, and FIG. 3 is a sectional view of a printer which is an example of the electrostatic recording apparatus. FIG. 4 is a sectional view of an electrophotographic copying machine which is an example of the electrostatic recording device. 13,14,53,54,55 …… Paper 103,104,6,32, PT …… Paper feeding means 15 …… Cutter 34 …… Paper passage detecting means 34,35,36,37,38 …… Paper jam detecting means

Claims (1)

[Scope of utility model registration request] 1. A roll of paper, a paper feed means for carrying the paper, a cutter for cutting the paper carried by the paper feed means substantially at right angles to the carrying direction, and the paper is a cutter. In an electrostatic recording apparatus having a paper passage detecting means for detecting that the paper is passing through the cutting position and a paper jam detecting means for detecting paper jam downstream of the cutter, the paper is cut by the paper passage detecting means by the cutter. While the sheet is passing through the position, when the paper jam detecting means detects the paper jam, the paper feeding means continues to convey the paper until a predetermined time elapses, and then the cutter cuts the paper, and then the An electrostatic recording device characterized in that a paper feeding means is stopped.