JPH04217549A - Paper sheet carrier - Google Patents

Abstract

PURPOSE:To stiffen a paper sheet by means of elastic force without forcing the sheet to be unnaturally changed in a shape by placing respective rotation axes of a pair of upper rotating bodies so that they tilt mutually inward toward the downstream side of a paper carrying direction. CONSTITUTION:Lower rollers 3, 3 are formed under a paper sheet 1 being previously cut into a required size, while the rollers 3, 3 are connected to an axis 4, and a belt 5 led from a driver is wound around a pulley 6 at the end of the axis 4 to rotate the rollers 3, 3. Upper rollers 2 are formed oppositely to the rollers 3, 3 respectively with the paper sheet 1 interposed, while the respective rollers 2, 2 tilt with a slight angle with respect to the axis 4 mutually inward toward the downstream side of a carrying direction A of the paper sheet 1. Therefore, when the paper sheet 1 is actually carried by this carrier, both ends of the paper sheet are brought toward the center by the rollers 2, 2 so that the center of the sheet slightly swells to have a swell 1a formed, and elastic force occurs on the sheet which is to be stiffened.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a paper conveyance device suitable for conveying cut sheet paper, which is mainly used in image forming apparatuses such as copying machines, printers, and facsimile machines.

0002

2. Description of the Related Art Conventionally, a mechanism has been used as a paper conveyance device to convey paper by sandwiching the paper between a pair of upper and lower rollers rotating in the paper conveyance direction and driving the lower roller. ing.

FIGS. 3 and 4 show a conveying device used on the paper discharge side of a device, in which paper 10 is sandwiched between upper rollers 11, 11, 11 made of plastic and lower rollers 12, 12, 12 made of rubber. , lower roller 1
The lower rollers 12, 12, 12 are driven to rotate by rotating a pulley 16 via a belt 15 from a drive source (not shown) to which a shaft 14 directly connects the rollers 12, 12, 12, and transports the paper 10.

[0004] The upper rollers 11, 11, 11 usually have a simple cylindrical shape that follows the driving force of the lower roller, so the frictional force at the contact surface with the paper 10 is weak. Therefore, the upper roller easily stops rotating even if the transport resistance increases slightly due to static electricity adhesion between the sheets. Then, if the upper roller is stopped when the paper 10 is conveyed again, the contact surface with the paper becomes resistant to the conveyance force, resulting in insufficient conveyance force and paper jams may occur. . Therefore, the upper rollers 11, 11
, 11 have tapered surfaces 11a, 11a... at both ends thereof.
By forming a ridge and ruffling the paper 10 as shown in the figure during conveyance, and making lines in the longitudinal direction of the paper 10, it is possible to create frictional resistance with the upper roller and reliably rotate the paper 10, as well as to improve the elasticity of the paper itself. It was possible to improve the conveying power by increasing the strength of the product.

[0005]

However, since the ends of the tapered surfaces 11a, 11a, .
10a... may appear. This phenomenon was particularly noticeable on paper with good surface properties used for color copying. Furthermore, when the conveyed paper is large and long, near the end of the paper, the elasticity of the paper itself, which has been ruffled, becomes weak, leading to insufficient conveyance force and the risk of paper jams. .

[0006] The present invention is intended to eliminate the drawbacks of the prior art, and provides a paper conveying device that can give stiffness to the paper using elastic force without forcing the paper to undergo an unreasonable change in shape. The purpose is to provide.

[0007]

[Means for Solving the Problems] The paper conveying device of the present invention includes at least one pair of upper rotating bodies and a lower rotating body that are formed to be rotatable in the conveying direction, and the paper is sandwiched between the two rotating bodies and rotated. The conveyance device conveys paper by driving a moving body, and has a structure in which the rotating shafts of the pair of upper rotating bodies are arranged so as to be inclined inwardly toward the downstream side in the conveyance direction of the paper. The above objectives are achieved.

[0008]

[Operation] By tilting the upper rollers, which are the upper rotating bodies, inward from each other as described above, both ends of the paper are brought together toward the center, and the center gradually expands.
It is possible to give elasticity and stiffness to the paper without creating streaks on the paper.

[0009]

[Examples] Examples of the present invention will be described below.

In FIGS. 1 and 2, 1 is a sheet of paper that has been cut to a required size in advance, and lower rollers 3, 3 are formed below the sheet of paper 1, and both are directly connected to a single shaft 4. belt 5 led out from a drive device (not shown)
is wound around the pulley 6 at the end of the shaft 4, and the lower rollers 3, 3
is driven in rotation.

Reference numeral 2 denotes an upper roller, which is formed to face the lower rollers 3, 3 with the paper 1 in between, and the upper rollers 2, 2 are arranged in a direction A in which the paper 1 is conveyed.
The shafts are inclined at a slight angle θ with respect to the axis 4 toward the downstream side of the shaft 4 and toward the inside of each other.

Therefore, when the paper 1 is actually transported by the same transport device, both ends of the paper are moved by the upper roller 2.
, 2 to the center of the paper, the center part of the paper rises slightly to form a bulge 1a, which generates elastic force in the paper and gives it stiffness.

[0013]

According to the present invention, since the upper roller has a simple cylindrical shape, it does not create streaks on the paper 1, and the bulge 1a at the center is large and is formed gently, so that the upper roller does not form streaks on the paper 1. I will never come to you. Further, the bulge 1a of the paper 1 is small when the paper is short with respect to the transport direction A, and becomes large when the paper is long with respect to the transport direction A, and freely changes depending on the transport length. Therefore, as the paper becomes larger (longer), the stiffness of the paper becomes stronger, and it is possible to solve the problem of insufficient conveying force near the end of the paper.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a paper conveyance device of the present invention.

FIG. 2 is a side view showing the paper conveyance device of the present invention.

FIG. 3 is a perspective view showing a conventional paper conveyance device.

FIG. 4 is a side view showing a conventional paper conveyance device.

[Explanation of symbols]

1 Paper 1a Bulge 2 Upper roller 3 Lower roller 4 axis

Claims (1)

[Claims] [Claim 1] At least one pair of upper rotating bodies and a lower rotating body formed to be rotatable in the conveyance direction, and a conveyance system in which paper is conveyed by sandwiching the paper between the two rotating bodies and driving the rotating bodies. What is claimed is: 1. A paper conveyance device, wherein the rotational axes of the pair of upper rotating bodies are arranged so as to be inclined inwardly toward the downstream side in the paper conveyance direction.