JPH0632487A - Paper sheet conveying device for copying machine - Google Patents

Abstract

PURPOSE:To reduce the friction between a guide plate and paper sheets, and to suppress the friction noise between the guide plate and paper sheets, so as to reduce the noise of the paper sheets when they are conveyed, in the paper sheet conveying device for a copying machine. CONSTITUTION:The conveying passage 2 of paper sheets delivered from a paper feeder is regulated by a guide plate 1 whose contact surface is surface- processed with a low friction material 3, or by a guide roller using a fluid bearing, and the paper sheets are delivered to a developing section without generating a friction noise between the paper sheets, and the guide plate or the guide roller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device for a copying machine, which is provided with a guide plate made of metal or the like to regulate a sheet conveying path in a sheet conveying process.

[0002]

2. Description of the Related Art In recent years, in a sheet conveying apparatus of a copying machine, a sheet conveying path is regulated by a guide plate made of metal or the like in a sheet conveying process.

FIG. 5 shows a guide portion of a sheet conveying device in a conventional copying machine, and FIG. 6 is a sectional view showing an example of a guide plate used in the sheet conveying device. In FIG. 5, reference numeral 1 denotes two upper and lower guide plates that regulate the paper path.
Reference numeral 2 denotes a sheet conveyance path. The right side of the drawing is a sheet feeding section and the left side is a developing section. The guide plate 1 that regulates the paper path has an uneven cross section as shown in FIG. 6 in order to reduce the contact surface 4 with the paper.

The sheet fed from the sheet feeding section on the right side of FIG. 5 in the direction of the arrow comes into contact with the contact surfaces 4 of the upper and lower two guide plates 1 and is regulated in the conveying route, so that the sheet passes a certain conveying route. And sent to the left development section.

[0005]

However, in the above-mentioned conventional sheet conveying apparatus, when the sheet passes through the guide plate 1, the contact area is made small as shown in FIG. There is a problem in that they come into contact with each other and a frictional noise is generated due to friction between them.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to prevent the generation of frictional noise between the guide plate 1 and the paper.

[0007]

In order to achieve this object, the sheet conveying device of the copying machine of the present invention is replaced with a guide plate or a guide plate whose contact surface with a sheet is processed with a low friction material. It is characterized by using rollers.

[0008]

According to the present invention, the sheet fed from the sheet feeding section is regulated in the conveying path by the upper and lower guide plates or rollers, but even if the sheet comes into contact with the guide plate at this time, the contact surface has low friction. Since the material is surface-treated, there is almost no friction between the paper and the guide plate, and therefore the friction noise can be suppressed. Further, if the roller is used, there is almost no frictional resistance and no frictional noise is generated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a guide portion in a sheet conveying device of a copying machine according to a first embodiment of the present invention. In FIG. 1, 3 is a low friction material surface-treated on two upper and lower guide plates 1. Yes, this is for example a hydrogen fluoride compound. Further, the contact surface 4 of the guide plate 1 which comes into contact with the paper has an uneven cross section as shown in FIG. 2 and is surface-treated with a hydrogen fluoride compound which is the low friction material.

In this embodiment, even if the guide plate 1 and the paper contact and rub against each other, the frictional resistance is small and therefore no frictional noise is generated. Actually drive the copier, 1 from the copier
When measuring the noise level at m and 1.2 m above the ground, the noise was 55 dB (A) when the guide plate surface was not processed. It fell to 53 dB (A).

FIG. 3 shows a guide portion in the sheet conveying device of the copying machine according to the second embodiment of the present invention. In FIG.
1 is a guide roller that regulates the sheet conveyance path.
Instead of the guide plate 1 of FIG. FIG. 4 is a sectional view showing an example of a liquid bearing used in the guide roller 5, 51 is a fluid bearing, 52 is a roller, and 53 is a viscous fluid.

According to this embodiment, with the above-described structure, the sheet fed from the sheet feeding section on the right side of FIG. 3 in the direction of the arrow comes into contact with the guide roller 5 and is regulated on the conveying path to be fed to the developing section on the left side. Go. When the roller 52 starts rotating, the groove 51 of the hydrodynamic bearing
By virtue of the action of a, the viscous fluid 53 lifts the roller 52, and the roller can be smoothly rotated without making a noise. Thus, when the guide roller is used instead of the guide plate, there is almost no frictional resistance, and therefore no frictional noise is generated. Further, since the fluid bearing is used, no noise is generated by the rotation of the roller.

[0013]

As described above, the paper transporting device of the copying machine according to the present invention comprises the guide plate or the guide roller formed by surface processing the contact surface of the guide plate with the paper by the low friction material. The friction of the paper can be reduced, and the friction noise when the paper is conveyed can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a guide unit in a sheet conveying device of a copying machine according to a first embodiment of the present invention.

2 is a cross-sectional view of the guide plate of FIG.

FIG. 3 is a diagram showing a guide unit in a sheet conveying device of a copying machine according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing an example of a fluid bearing used in the second embodiment of FIG.

FIG. 5 is a diagram showing a guide portion of a sheet conveying device in a conventional copying machine.

6 is a cross-sectional view showing an example of the guide plate of FIG.

[Explanation of reference numerals] 1 ... Guide plate, 2 ... Paper conveying path, 3 ... Low friction material, 4 ... Contact surface of guide plate with paper, 5 ... Guide roller, 51 ... Fluid bearing, 51a ... Fluid bearing groove , 52 ... roller, 53 ... viscous fluid.

Claims (2)

[Claims] 1. A copying machine, wherein a guide plate made of metal or the like defines a sheet conveying path, wherein a guide plate is used, in which the contact surface of the guide plate with the sheet is surface-treated with a low friction material. Paper transport device for copier. 2. A sheet conveying device for a copying machine according to claim 1, wherein a roller using a liquid bearing is provided instead of the guide plate.