JPH0551166A - Image forming device - Google Patents

Abstract

PURPOSE:To provide an image forming device enabling the decrease of inspection places at the time of a recording medium such as transfer paper being jammed so as to improve operability regarding the improvement of sheet conveying technique in the image forming device. CONSTITUTION:An image forming device is provided with a paper supply part 20 for supplying transfer paper P, discharge parts 29, 30 for discharging the transfer paper P, and image forming parts 15, 25, 28 for forming images on the transfer paper P. In the case of the transfer paper being jammed in a carrier path, a movable plate 3 is protruded into the carrier path from an inlet guide 2 provided in front of a fixing unit 28 in order to interfere the conveyance of the transfer paper P into the carrier path by a conveyance interfering member 1, and carrier parts 22a-22c, 23a-23d, 24 are driven by a conveyance control means so as to convey the transfer paper P2, P3, P4 left in the carrier path toward the conveyance interfering means 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a printer or a copying machine using an electrophotographic system, and more particularly to improvement of a sheet conveying technique in the image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, in a copying machine of this type, for example, an electrophotographic system, when a paper jam occurs in the paper conveyance path, the conveyance of the paper is immediately stopped and the paper remaining in the conveyance path is removed. It is being done by the operator.

FIG. 7 is a schematic sectional view showing the structure of a copying machine using an electrophotographic system, and shows a state immediately after the conveyance is stopped when a paper jam occurs. Here, the copying process shown in the figure will be described. The original 11 is scanned while being illuminated by the lamp 12, and the reflected light thereof is reflected by the mirrors 13a to 13a.
The photosensitive drum 15 is exposed through d and the lens 14. At this time, the surface of the photosensitive drum 15 is first charged by the primary charger 1
It is uniformly charged by 6, and a latent image is formed by exposure. Next, the photosensitive drum 15 rotates in the direction of the arrow and is developed by the developing device 18 supplied with the transfer material 18. And the paper trays 19 to 20, 2
The transfer paper P that is fed from any one of the
a-22c and registration rollers 23a-23d and 24, the toner image on the photoconductor drum 15 is sent out at the same timing, is transferred by the transfer charger 25, is separated by the separation charger 26, and is conveyed by the conveyor belt 27.
After being conveyed and fixed to the fixing device 28 by the paper discharge roller 2
The sheet is discharged to the discharge tray 30 via 9. The residual toner remaining on the photosensitive drum 15 after the transfer is removed by the cleaner 31 in preparation for the next copy.

In the state shown in FIG. 7, the paper is discharged from the paper tray 20 and the paper discharge roller 2 is in the middle of continuous copying.
At 9 point, a paper jam occurs and the machine is stopped. At this time, a message "Please clear the paper jam" is issued to the operation unit of the copying machine, and the operator transfers the transfer papers P1, P2, P3 remaining in the transport path.
Copying is resumed after all four sheets of P4 are removed.

[0005]

However, in the above-mentioned conventional example, as described above, when a paper jam occurs in the transport path, the remaining 4 sheets remain in the transport path.
In order to remove all the transfer sheets P1, P2, P3 and P4, it is necessary to inspect four places of the sheet feeding section, the transfer section, the transport section and the sheet discharging section, which makes the operation complicated and troublesome. Was there.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its object is to reduce the number of inspection points and reduce the operability when a paper jam of a recording medium such as a transfer paper occurs. An object of the present invention is to provide an image forming apparatus that can be improved.

[0007]

In order to achieve the above object, in the present invention, a paper feed section for feeding a recording medium,
A discharge unit that discharges the recording medium, an image forming unit that forms an image on the recording medium, a conveyance path of the recording medium that connects the paper feed unit, the image forming unit, and the discharge unit, and the conveyance path. In an image forming apparatus having a conveyance section capable of conveying a recording medium along a line, a detection unit that detects a conveyance failure of the recording medium in the conveyance route, and a conveyance of the recording medium in the conveyance route based on the detection unit And a transport control unit for controlling the transport unit to transport the recording medium remaining in the transport path toward the transport blocking unit.

In a preferred embodiment of the present invention, the conveyance obstructing means has a movable plate and a solenoid connected to the movable plate via a link member, and the movable plate is moved by driving the solenoid. It is to be projected into the transport path.

Further, as another preferred embodiment of the present invention, the conveyance obstructing means is provided in the vicinity of the image fixing portion in the copying machine.

[0010]

According to the present invention, however, the conveyance obstruction means for obstructing the conveyance of the recording medium is provided in the conveyance path, and the driving of each conveying section is independently controlled, whereby the conveyance obstacle such as a paper jam of the recording medium is caused. Even if a problem occurs, the remaining recording medium can be removed by transporting the recording medium remaining in the transport path to the transport disturbing means and inspecting the location of this transport disturbing means, thus improving the operability. You can

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

1 to 4 are views showing an image forming apparatus according to an embodiment of the present invention, and are schematic vertical sectional views showing the construction of a copying machine using an electrophotographic system in this embodiment. It should be noted that the same reference numerals are given to those having the same configuration as that of FIG. 7 used in the conventional example.

The structure of the copying machine according to the present embodiment is the same as the original document 11
Is irradiated by the lamp 12 and scanned, and the reflected light is exposed on the photosensitive drum 15 via the mirrors 13a to 13d and the lens 14. The surface of the photosensitive drum 15 is charged by the primary charger 16, a latent image is formed by exposure, and the latent image is developed by the developing device 18. Then, the transfer paper P fed from any of the paper trays 19 to 20 and 21 is transferred to the registration rollers 22a to 22c and 23a.
-23d and 24 send the toner image on the photosensitive drum 15 at the same timing, and transfer charger 25
After being transferred by, the toner is separated by the separation charging device 26, conveyed to the fixing device 28 by the conveying belt 27 and fixed, and then discharged to the discharge tray 30 via the paper discharge roller 29.

The state of the copying machine shown in FIG. 1 shows a state immediately after the conveyance is stopped when a paper jam of the transfer paper occurs, and the transfer paper causes the paper jam at the discharge roller 29 and enters the conveyance path. 4 sheets of transfer paper P1, P2, P to be removed
3, P4 remains. In this state, the message "Please clear the paper jam" is not yet output to the operation unit (omitted in the figure) of the copying machine.

In the present embodiment, as shown in FIG. 2, the conveyance obstructing member 1 comes out from the central portion of the entrance guide of the fixing unit 28 of the copying machine. FIG. 5 and FIG. 6 show the structure of the conveyance obstructing member. Here, 28a is a fixing roller, 28b is a pressure roller, and 2 is an inlet guide for supplying the transfer paper sent from the conveyor belt 27 to the fixing roller 28a and the pressure roller 28b. The entrance guide 2 is the fixing roller 2
8a is arranged adjacent to the contact portion between the pressure roller 28b,
An opening 2a extending substantially parallel to the axis of the fixing roller 28a is provided in the center thereof. The conveyance obstructing member 1 has a movable plate 3, a link member 4, and a solenoid 5. The width of the movable plate 3 is substantially equal to that of the opening 2a, and the lower end of the movable plate 3 is rotatably connected to one end of the link 4a.
The other end of is connected to the solenoid 5 via a plunger 4b and a fulcrum 4c. In addition, a substantially central portion of the link 4a is supported by a support bearing 4c via a support shaft 4d.

When a paper jam occurs in the conveyance path of the copying machine, a sensor (not shown) that detects the jam causes the solenoid 5 to be activated, the plunger 4b is attracted, and the link 4a rotates via the fulcrum 4c. As a result, the movable plate 3 projects from the opening 2a of the entrance guide 2 as shown in FIG. As a result, the movable plate 3 can interfere with the conveyance of the transfer paper in the conveyance path.

After the movable plate 3 of the conveyance obstructing member 1 protrudes into the conveyance path, as shown in FIG. 3, the paper feeding conveyance section 22a-2.
2c, the registration rollers 23a-23d and 24, and the conveyor belt 27, respectively, to drive the remaining transfer papers P1 and P1.
2, P4 is conveyed to the conveyance obstruction member 1. At this time, the fixing roller and the discharging roller of the fixing unit and the discharging unit where the transfer paper P1 that has caused the paper jam remains are not driven because they may damage the rollers and the like.

Then, as shown in FIG. 4, the transfer paper P2
When P3 and P4 reach the conveyance obstruction member 1, the sheet feeding / conveying units 22a-22c and the registration rollers 23a-23.
The driving of d and 24 and the conveyor belt 27 is stopped. In this state, "Please remove the paper jam" on the operation section of the copier.
Is output and the operator is prompted to perform the processing.
Then, the operator can remove all the remaining transfer paper by inspecting only the paper discharge section and the transfer section where the transfer obstructing member 1 is located, which is very excellent because there is no transfer paper left and the processing procedure is small. It is possible to provide excellent operability.

In the above embodiment, the conveyance obstructing member 1 is provided at the entrance guide of the fixing unit, but the present invention is not limited to this, and it may be provided in another conveyance path, for example, in front of the registration rollers. In addition, when the conveyance path of the image forming apparatus is long,
It is also possible to provide a plurality of conveyance obstructing members to dam the transfer paper for each block.

[0020]

As described above in detail, according to the present invention, the conveyance obstructing means for obstructing the conveyance of the recording medium is provided in the conveyance path, and the recording medium remaining in the conveyance path is directed to the conveyance obstruction means. Since each transport unit is independently drive-controlled so as to be transported, it is possible to reduce the number of inspection points at the time of a failure such as a paper jam of the recording medium, and to remarkably improve the operability.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the configuration of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing the configuration of the image forming apparatus according to the embodiment of the invention.

FIG. 3 is a schematic cross-sectional view showing the configuration of the image forming apparatus according to the embodiment of the invention.

FIG. 4 is a schematic sectional view showing a configuration of an image forming apparatus according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of a conveyance obstructing member according to the present embodiment.

FIG. 6 is a perspective view showing a configuration of a conveyance obstructing member according to the present embodiment.

FIG. 7 is a schematic cross-sectional view showing a configuration example of a conventional copying machine.

[Explanation of symbols]

 1 Transport Obstruction Member 2 Entrance Guide 3 Movable Plate 4 Link Member 5 Solenoid P Transfer Paper

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B65H 5/36 7111-3F G03G 15/00 112 7369-2H

Claims (3)

[Claims] 1. A paper feeding unit for feeding a recording medium, a discharging unit for discharging the recording medium, an image forming unit for forming an image on the recording medium, the paper feeding unit, the image forming unit and the discharging unit. An image forming apparatus having a conveyance path for a recording medium that connects the two recording mediums and a conveyance section that can convey the recording medium along the conveyance path, and detecting means for detecting a conveyance failure of the recording medium in the conveyance path. A conveyance obstructing means for obstructing the conveyance of the recording medium into the conveyance path based on the detecting means, and conveying the recording medium remaining in the conveyance path toward the conveyance obstruction means by controlling the conveyance section. An image forming apparatus, which is provided with a conveyance control unit. 2. The transport obstructing means has a movable plate and a solenoid connected to the movable plate via a link member, and drives the solenoid to cause the movable plate to project into the transport path. The image forming apparatus according to claim 1, wherein: 3. The transport obstructing means is provided in the vicinity of an image fixing portion in a copying machine.
The image forming apparatus according to the item.