JP2003040481A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device including a paper jam eliminating mechanism for taking out a jammed long sized paper easily. SOLUTION: A pair of guide plates 4, which can rotate in an orthogonal direction to a transfer paper carrying direction, and can be taken out to an external, are provided in a transfer paper carrying path. The pair of the guide plates 4 are arranged on an upstream side of a pair of register rollers. A sensor 15 for detecting a wound transfer paper is provided in a periphery of the pair of the guide plates 4, and a display means 16 for displaying a state that the transfer paper is wound by a sensor output is provided.

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, and more particularly to a paper jam handling mechanism for the image forming apparatus. The present invention is suitable for an image forming apparatus capable of forming an image on long paper.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus that handles a special long transfer sheet, when the transfer sheet is jammed, the transfer sheet is stopped, and then a corresponding guide plate in a transfer sheet conveyance path is opened and closed. Generally, the remaining paper is processed by taking out the paper.

[0003]

However, in the prior art, the size of the guide plate that can be opened and the processing space are often insufficient due to the small size and complexity of the device, and especially the long size. If the paper is handled incorrectly, there is a problem that the remaining paper is left in the device, which makes the paper jam processing more difficult. SUMMARY OF THE INVENTION It is an object of the present invention to provide an image forming apparatus having a paper jam removing mechanism that can easily take out a jammed long paper, with the object of solving the problems of the related art. And

[0004]

The above object of the present invention can be achieved by the following means. That is, the invention according to claim 1 is most characterized by an image forming apparatus provided with a guide plate pair that is rotatable in a direction orthogonal to the transfer paper transport direction and that can be taken out to the outside in the transfer paper transport path. . A second aspect of the present invention is characterized in that, in the image forming apparatus according to the first aspect, the guide plate pair is an image forming apparatus arranged upstream of the registration roller pair. According to a third aspect of the present invention, in the image forming apparatus according to the first aspect, the image forming apparatus is mainly characterized in that a guide roller for guiding a transfer paper winding guide is provided at each guide plate end portion of the guide plate pair. . According to a fourth aspect of the present invention, in the image forming apparatus according to the first aspect, a sensor is provided near the pair of guide plates to detect the wound transfer paper, and the transfer paper is wound by the sensor output. The main feature is an image forming apparatus provided with a display unit for displaying the fact.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1 is a configuration diagram of a transfer sheet transport system of an image forming apparatus according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a drive control mechanism of a guide plate pair and a transfer sheet detection display mechanism, which are essential parts of the present invention, FIG. 3 is a diagram showing a state in which a long transfer paper is wound around a pair of guide plates. As shown in FIG. 1, a paper feed roller pair 3, a guide plate pair 4, and a registration roller pair 5 are arranged in this order from the upstream side in the transfer paper conveyance path between the paper feed tray 1 and the photosensitive drum 2. There is. A guide roller 6 for guiding the transfer paper winding is provided at each end of the guide plates forming the pair of guide plates 4. The transfer roller 7 is opposed to the photosensitive drum 2. The transfer paper on the paper feed tray 1 is conveyed by the paper feed roller pair 3, passes through the guide plate pair 4, reaches the stopped registration roller pair 5, and the registration roller pair 5 regulates the leading end position. Then, the transfer paper is paired with the registration roller pair 5 in time with the front end of the toner image on the photosensitive drum 2.
The toner image is transferred to the transfer portion by the transfer roller 7, and the toner image is transferred by the action of the transfer roller 7. By the way, a paper jam occurs somewhere in the transfer paper conveyance path, and the paper conveyance drive system of the machine is stopped by the time the transfer paper fed by the paper feed roller pair 3 reaches the registration roller pair 5. In this case, the transfer sheet is sandwiched between the two guide plates forming the guide plate pair 4 and stopped.

The guide plate pair 4 of the present invention is adapted to rotate in a direction orthogonal to the transfer sheet conveying path and to wind up the transfer paper sandwiched by the guide plate pair 4, particularly long paper. There is. The guide plate pair 4 has its inner end edge attached to the connecting member 20, and the connecting member 20 is attached to the rotating shaft 13. Reference numeral 14 is a lock claw, which is rotated around the shaft 14a by the solenoid 21 in the arrow direction to lock the connecting member 20 and the like at the hook portion at the tip to prevent the guide plate pair 4 from being pulled out forward. On the other hand,
When the solenoid 21 is actuated based on a control signal from the CPU, the locking by the hook portion is released so that the guide plate pair 4 can be pulled out. That is, when a paper jam occurs, the paper feed roller pair 3 and the registration roller pair 5 before and after the guide plate pair 4
The pressure between the rollers is released, and the motor 11 shown in FIG. 2 is driven. This driving force is transmitted to the rotary shaft 13 of the guide plate pair 4 via the clutch 12, whereby the guide plate pair 4 rotates about the rotary shaft 13, and the transfer paper stopped therein is guided by the guide plate pair. Wrap around 4. At this time,
The action of the guide roller 6 contacting the transfer paper at the beginning of winding prevents the transfer paper from being damaged by the guide plate. When the guide plate pair 4 winds up all the transfer paper and the guide plate pair 4 rotates 90 degrees from the beginning of winding, the motor 1
1 stops. After the pair of guide plates 4 is completely stopped, the lock claw 14 is disengaged. As a result, the guide plate pair 4 can be pulled out toward you.

As shown in FIG. 3, the transfer sheet P is wound around the pulled-out guide plate pair 4. Since the guide plate pair 4 can be arbitrarily rotated when it is completely drawn out of the apparatus main body, if the tip of the wound transfer paper is pulled in the direction of arrow A, the guide plate pair 4 rotates and the transfer paper P is unwound. .
This will remove the jammed transfer paper. As shown in FIG. 2, a sensor 15 for detecting the transfer paper wound around the guide plate pair 4 is provided near the guide plate pair 4, and the sensor output is displayed on the display panel 16. Has become. Therefore, when the transfer paper is left unwound without being removed, the sensor 15 displays a message on the display panel 16 indicating that the paper is left unwound, so that the user can be warned.

[0008]

As described above, according to the present invention as set forth in claims 1 and 2, the guide which is rotatable in the transfer paper conveying path in the direction orthogonal to the transfer paper conveying direction and which can be taken out to the outside. Since the plate pair is provided, the transfer paper, especially the long paper, which remains between the guide plates due to the paper jam can be wound around the rotating guide plate pair. Since the paper jam can be easily removed by pulling out the guide plate pair with the transfer paper wound, the size reduction,
This technique is suitable for an image forming apparatus that saves space. According to the invention of claim 3,
By installing the guide roller at the end of the guide plate, it is possible to reduce the load applied to the transfer paper when the transfer paper is wound, and as a result, it is possible to prevent the transfer paper from being torn when it is wound around the guide plate. . Further, according to the invention of claim 4, a sensor for detecting the wound transfer paper is provided near the pair of guide plates, and a display means for displaying that the transfer paper is in the wound status by the sensor output is provided. Since it is provided, it is possible to issue a warning to the user when the transfer paper is left in a state of being wound around the pair of guide plates.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a transfer paper transport system of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a drive control mechanism for a pair of guide plates and a transfer paper detection / display mechanism that are essential parts of the present invention.

FIG. 3 is a diagram showing a state in which a long transfer sheet is wound around a pair of guide plates.

[Explanation of symbols]

1 paper feed table, 2 photoconductor drums, 3 paper feed roller pairs, 4
Guide plate pair, 5 registration roller pair, 6 guide roller, 7 transfer roller, 11 motor, 12 clutch,
13 rotary shaft, 14 lock claw, 15 sensor, 16
Display panel

Continued front page    F-term (reference) 2H027 DC14 ED16 EF13 EK09 GB08                 2H072 AA02 AA07 AA16 AA22 EA01                       EA16 JA04                 3F048 AA01 AB01 BA14 BC03 BD03                       BD05 CC01 DA06 DC00 EA03                       EA12 EB22                 3F101 FA01 FB01 FC12 FC14 FE08                       FE11 LA01 LB03

Claims (4)

[Claims] 1. An image forming apparatus, wherein a pair of guide plates which are rotatable in a direction orthogonal to the transfer paper transport direction and which can be taken out to the outside are provided in the transfer paper transport path. 2. The image forming apparatus according to claim 1,
The image forming apparatus, wherein the pair of guide plates is arranged upstream of the pair of registration rollers. 3. The image forming apparatus according to claim 1,
An image forming apparatus, wherein guide rollers for guiding a transfer paper take-up are provided at end portions of the guide plates of the pair of guide plates. 4. The image forming apparatus according to claim 1,
An image forming device, which is provided with a sensor for detecting the rolled-up transfer paper, in the vicinity of the pair of guide plates, and display means for displaying that the transfer paper is in the wound-up state based on the sensor output. apparatus.