JPH0423243Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a paper conveying device for an electrophotographic printing apparatus using a pressure fixing device.

PRIOR ART AND PROBLEMS FIG. 1 is a diagram for explaining a paper conveyance device of a conventional electrophotographic printing apparatus, where a is a view seen from a direction perpendicular to the paper conveyance direction, and b is a view taken from the Z arrow in figure a. It is a view seen from the direction. In the figure, 1 is paper;
Reference numeral 2 indicates a separation claw, 3 a separation claw support shaft, 4 a pinch roller, 5 a conveyance roller, 6 a photosensitive drum, and 7 a pressure fixing device.

The paper conveyance device shown in FIG. 1 includes a separation claw 2 whose tip is inserted into a groove of a photosensitive drum 6, and whose fulcrum is a support shaft 3.
A pinch roller 4 rotatably supported by the separation claw 2 is provided so as to contact the conveyance roller 5 with a certain pressure, and the paper 1 adsorbed on the photosensitive drum 6 in the transfer section is removed by the separation claw. 2, the paper 1 is forcibly peeled off, the paper 1 is pinched between a pinch roller 4 and a conveyance roller 5, and the paper 1 is sent to a pressure fixing device 7.

In such a conventional paper conveying device, the only place to press the paper 1 to convey it is the contact point between the pinch roller 4 and the conveyance roller 5, so the photosensitive drum 6
Paper 1 is pulled off on one side when it is adsorbed on the
A force is applied in the direction opposite to the separation side, and the sample is deflected in the direction of arrow A. Further, in the pressure fixing device 7, the axes of the pressure rollers 7a and 7b are slightly obliquely arranged as shown in FIG. 2, so that the pressure distribution is not uniform. This, together with the above-mentioned deflection of the paper 1, has the disadvantage that wrinkles and transfer omissions occur in the paper 1.

Purpose of the invention In view of the above-mentioned conventional drawbacks, the present invention provides a paper conveyance device that prevents paper wrinkles and transfer omissions in the transfer section and allows stable paper conveyance in an electronic printing device using a pressure fixing device. The purpose is to

Structure of the invention According to the invention, the purpose is to provide a separating claw for separating paper from an image carrier carrying a toner image;
a roller fixing device consisting of a pair of rollers disposed so that their central axes intersect, and fixing the toner image on the paper while holding the separated paper between the rollers and transporting the separated paper; the separating claw and the roller; A transport roller and a pinch roller are provided between the fixing device and the paper separated from the image carrier by the separating claw and transport the paper, and the pinch roller is in diagonal contact with the transport roller. This is achieved by providing a paper conveyance device characterized in that its support shaft is inclined with respect to the conveyance roller axis.

Examples of ideas Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a diagram for explaining the main parts of the paper conveying device according to the present invention, and the parts not shown are the same as those in FIG. 1. In the figure, 10 is paper;
Reference numeral 11 indicates a pinch roller, and reference numeral 12 indicates a conveyance roller.

In this embodiment, as shown in FIG. 3, a conveyance roller 12 and a pinch roller 11, which sandwich and convey the paper 10 separated from the photosensitive drum by a separating claw,
The support shaft 13 of the pinch roller 11 is inclined at an angle θ with respect to the support shaft 14 of the transport roller 12 so that the pinch roller 11 contacts the transport roller 12 obliquely.

In this embodiment configured as described above, the paper 1 separated from the photosensitive drum by the pinch roller 12 is
0 in the direction of arrow B. Therefore, by appropriately adjusting the inclination angle θ, the force in the B direction can be balanced with the force in the A direction explained in FIG. It is possible to prevent the occurrence and transfer omission.

Effects of the Invention As explained above in detail, the paper conveyance device of the present invention smoothes the conveyance of the paper by tilting the spindle of the pinch roller in contact with the conveyance roller, thereby preventing the occurrence of wrinkles and missing transfer in the pressure fixing device. It is said that it can have a great effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining a conventional paper conveyance device, FIG. 2 is a diagram for explaining a pressure fixing device, and FIG. 3 is a diagram for explaining the main parts of a paper conveyance device according to the present invention. be. In the drawings, 10 indicates paper, 11 indicates a pinch roller, and 12 indicates a conveyance roller.

Claims (1)

[Claims for Utility Model Registration] A separating claw provided near one end of an image carrier carrying a toner image in order to separate paper from the image carrier carrying a toner image, and a separating claw provided so that its central axis intersects a roller fixing device that fixes the toner image on the paper while sandwiching and transporting the separated paper between the rollers; a conveyance roller and a pinch roller, which are provided near the separation pawl and convey the paper separated from the image carrier by the separation pawl; A paper conveyance device characterized in that an axis is tilted with respect to a conveyance roller axis.