JPH0452205Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a transfer paper conveying device provided in an electrostatic recording device such as an electronic copying machine or an optical printer.

B. Prior Art In an electrostatic recording device, when the transfer paper on which an image has been transferred becomes jammed in the conveyance path from the photoreceptor drum to the fixing device, in order to easily remove the jammed paper, conventional techniques have been used to convey the transfer paper. The conveyance unit, which is equipped with rollers for conveying the transfer paper or a conveyance belt wrapped around the rollers that form the path, is configured to be rotatable around a single pivot point, making it possible to expand the work space. (See, for example, Japanese Patent Laid-Open No. 151954/1983).

When conveying transfer paper by sandwiching it between a main roller that is rotated by a drive source such as a motor and a sub-roller that comes into pressure contact with the main roller, the main roller is usually provided on the transport unit side and the sub-roller on the recording device main body side. Ta.

C. Problems to be solved by the invention When a jam occurs in the transfer paper conveyance path, each time the jammed paper is removed, the main roller and sub roller must be separated and brought into pressure contact again. For this reason,
Over a long period of time, the position of both rollers may become misaligned.
There is a possibility that the transfer paper may not be conveyed properly. Furthermore, since the main roller is attached to the conveying unit and then attached to the recording apparatus, it is very difficult to align the main roller and the sub roller. The present invention provides a transfer paper conveying device that solves these problems.

D. Means for Solving the Problems The present invention provides a transfer paper conveyance device in which a conveyance unit for conveying transfer paper using rollers is configured to be rotatable around a pivot shaft provided at one end thereof.
The transport unit includes a main roller that is supported by a chassis of the transport unit and driven to rotate, and a sub-roller that is supported by the chassis via a holding member and rotates in pressure contact with the main roller, and maintains the position of the sub-roller. The transfer paper conveyance device is characterized in that a position holding member is provided on the main body of the device to separate the sub roller and the main roller when the conveyance unit rotates from the transfer paper conveyance position.

E. Function Since the main roller and sub-roller for conveying the transfer paper are integrally provided in the conveyance unit, alignment of the main roller and sub-roller is facilitated, and misalignment of both rollers is less likely to occur. Further, when a jam occurs, rotating the conveyance unit separates the sub roller from the main roller, so that the jammed paper can be easily removed.

Embodiment FIGS. 1 and 1B are schematic configuration diagrams showing different aspects of an embodiment of the present invention. In these figures, 1
1 is a conveying unit, which includes a rotating first conveying roller 2 and a second conveying roller 3 connected to a motor (not shown), and a rotating first conveying roller 2 and a second conveying roller 3 that are pressed against the first conveying roller 2 and the second conveying roller 3 by springs 4 and 5, respectively. 1 sub roller 6,
The second sub roller 7 and the conveyance guide 8 are connected to the chassis 9.
It is set up and configured. Both sub rollers 6,
7 may be configured to be pressed against the respective conveyance rollers 2 and 3 by its own weight without relying on the springs 4 and 5. The conveyance unit 1 also includes a transfer corotron 11 for transferring the developed image formed on the photosensitive drum 10 onto a transfer paper (not shown). The conveying unit 1 has one end a parallel to the transfer paper conveying direction, and is rotatably provided in the main body of the recording apparatus about this end a as a pivot shaft.

Reference numerals 12 and 13 denote a lever 1 and a lever 2 that hold the conveying unit 1 on the side opposite to its end a, the lever 112 being shorter than the lever 213, and the holding parts 14 and 15 that come into contact with the chassis 9, respectively. It is provided. The lever 112 is fixed to the rotating shaft 16, and by rotating the knob 17, which is also fixed to the rotating shaft 16, the lever 112 is also rotated. The lever 213 is rotatably mounted on the rotating shaft 16, is brought into contact with the lever 112 by a torsion spring 18, and rotates in accordance with the movement of the lever 112.

The operation of the levers 1 and 2 will be explained with reference to FIGS. 2A and 2B. Normally, the lever 112 is pulled up by a helical spring 19, and the lever 21
3, the conveyance unit 1 is held at the transfer paper conveyance position (FIG. 1A, FIG. 2A). When a jam occurs, the conveyance unit 1 is rotated to open the conveyance path. When knob 17 is rotated counterclockwise, lever 112 and lever 2 are rotated accordingly.
13 also rotates counterclockwise. When the knob 17 is rotated to a certain angle, the lever 213 comes into contact with the bottom 20 of the recording apparatus main body and the rotation stops. Further turn the knob 17 to move only the lever 112 to the bottom 2.
Rotate until it touches 0. The conveyance unit 1 is then rotated, its holding position is lowered, and the conveyance path is opened (FIG. 1B, FIG. 2B). At this time,
The rotation angles of the levers 112 and 213 are different, and the levers 112 and 213 are located overlapping each other, so the holding position of the transport unit 1 can be changed to widen the transport path without requiring extra space. Can be opened.

Now, the chassis 9 and the conveyance guide 8 have through holes 2.
1 , 23 , 22 , 24 are provided, and push-up members 25 , 25 are fixed to the bottom 20 at positions corresponding to the through holes 21 , 22 , 23 , 24 .
When the transport unit 1 is lowered as shown in FIG.
4 to the first sub-roller 6 and second sub-roller 7
Push up the holding members 27 and 28, respectively. Therefore, both the sub rollers 6 and 7 are separated from the conveyance rollers 2 and 3, which are in pressure contact with each other. In other words, when removing the jammed paper, when the conveyance unit 1 is lowered, the pressure on the first conveyance roller 2 and the second conveyance roller 3 on the first sub-roller 6 and the second sub-roller 7, respectively, is released and the jammed paper is removed. removal is facilitated.

Effects of the Invention As is clear from the above description, in the present invention, the main roller and sub roller are assembled on the chassis of the conveyance unit, so positioning can be easily performed. Further, when removing jammed paper, the sub roller is separated from the main roller by the position holding member, so that the jam can be easily released even though the main roller and sub roller are integrated into a unit.

[Brief explanation of the drawing]

1A and 1B are schematic configuration diagrams of different aspects of an embodiment of the present invention, and FIGS. 2A and 2B are operation explanatory diagrams of an embodiment of the present invention. 1... Conveyance unit, 2... First conveyance roller (main roller), 3... Second conveyance roller (main roller),
4, 5... Spring, 6... First sub roller, 7...
Second sub-roller, 12...Lever 1, 13...Lever 2, 21, 22, 23, 24...Through hole, 2
5, 26... Push-up member, 27, 28... Holding member.

Claims (1)

[Scope of claim for utility model registration] A conveyance unit that conveys transfer paper using rollers is
In a transfer paper conveyance device configured to be rotatable around a pivot shaft provided at one end thereof, the conveyance unit includes a main roller supported by a chassis of the conveyance unit and driven to rotate, and a holding member. A sub-roller that is supported by the chassis and rotates in pressure contact with the main roller, and a position holding member that holds the position of the sub-roller is provided in the main body of the apparatus, and when the transport unit rotates from the transfer paper transport position, the sub-roller is rotated. and the main roller are separated from each other.