JPH0243183B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a registration device for an electrophotographic copying machine or the like.

A registration device in a conventional electrophotographic machine includes a paper feed device, such as a registration roll and a registration tray, as disclosed in, for example, Japanese Patent Application Laid-open No. 50-63944 and Japanese Patent Application Laid-open No. 53-148443. The paper sent out by the registration pinch roll is conveyed to the registration roll and the registration pinch roll, and enters the nip between the registration roll and the registration pinch roll, which are in a stationary state. At this time, the lead edge of the paper is suddenly stopped, so
The paper becomes in a swollen state (hereinafter referred to as buckling), and the paper skew is corrected so that the image on the photosensitive drum is parallel to the paper using the stiffness of the paper itself, and the image on the photosensitive drum and the registration When the registrations match, a mechanism such as a clutch rotates the registration roll to transport the paper toward the photosensitive drum.

In such conventional registration devices, in order to correct paper skew, the paper creates a buckle, and due to the stiffness of the paper itself,
The lead edge of the paper must rest along the nip of the registration roll and registration pinch roll.

However, if the paper is made of soft material and has a weak stiffness, it may not rest accurately along the nip, resulting in problems such as paper skew not being sufficiently corrected and registration variations increasing. .

The present invention aims to eliminate the drawbacks of the conventional registration device described above, and includes:
The object of the present invention is to provide a registration device that has a simple mechanism, has sufficient skew correction ability even when using paper with weak stiffness, and can reduce variations in registration. be.

The configuration will be explained below based on the embodiment shown in the drawings.

In the figure, 1 is a registration roll, 2 is a registration pinch roll, 3, 4, 5, and 6 are paper shoots, 7 is a photosensitive drum, 8 is a transport roll, and 9 is a transport pinch roll. The paper shoots 3, 4, 5, and 6 constitute an inlet of the registration roll 1 and a passage between the registration roll 1 and the photosensitive drum 7. On the other hand, reference numerals 12 and 13 are guide shoots that guide the paper from the position of the transport roll 8 to the paper shoots 5 and 6 on the entrance side of the registration roll 1. The passage constituted by these is provided in a curved manner, and the tip of the chute 13 located on the outside thereof is elastically deformed in the direction of the nip between the registration roll 1 and the registration pinch roll 2. An elastic body 10 is connected.

In the above configuration, the paper 11 fed from the paper feeder (not shown) is transported to the transport roll 8.
and is sent by the transport pinch roll 9 to guide chute 12, 13, paper chute 5,
6 and enters the nip between registration roll 1 and registration pinch roll 2. At this time, since the registration roll 1 is in a stationary state, the paper 11 forms a buckle between the guide shoots 12, 13 and the paper shoots 5, 6 as shown in FIG. This buckle pushes the elastic body 10 located on the outside of the curve of the guide chute 12, 13 from the position shown by the dotted line to the position shown by the solid line. Therefore, the paper 11 is accurately pressed against the nip between the registration roll 1 and the registration pinch roll 2 by the force of the elastic body 10.

Since the present invention is as described above, the soft paper 1
Even if it is 1, there will be little variation in registration, and the skew correction ability will also be improved. Furthermore, the elastic body 10 not only functions to press the paper 11 against the nip of the registration roll 1 and the registration pinch roll 2, but also serves as a guide for the leading edge of the paper 11, so that the leading edge of the paper 11 is slightly Even if the paper sheets 5 and 6 are curled, paper jams can be prevented from occurring.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram for explaining the configuration, and FIG. 2 is a diagram for explaining the operation. 1 is a registration roll, 2 is a registration pinch roll, 10 is an elastic body, and 11 is paper.

Claims (1)

[Scope of Claims] 1. An electrophotographic copying machine, etc., in which the leading edge of a sheet of paper 11 is pushed into the nip between a registration roll 1 and a registration pinch roll 2 by means of a transport roll 8 and a transport pinch roll 9. In the registration device, a path for guiding the paper to the nip between the transport roll 8 and the transport pinch roll 9 and the registration roll 1 and the registration pinch roll 2 is arranged in an appropriate manner. A registration tray for an electrophotographic copying machine or the like, characterized in that an elastic body 10 is curved with a curvature and is provided on a portion of the passage located on the curved outer surface side for urging a sheet of paper that has entered the nip in the direction of the nip. sion device.