JPH0355573Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a rubber roller for paper feeding that moves paper, etc. in contact with the surface by rotation.

(b) Prior Art The paper feed section of a printing machine, plain paper copying machine, etc. is equipped with a paper feed roller made of rubber molding or the like. This roller is for conveying one sheet of the stacked sheets at a predetermined timing.

(c) Problems to be solved by the invention Figure 3A shows how a conventional paper feeding rubber roller is used. This conventional rubber roller has a roller portion made of only rubber molded around a core material. Therefore, in this rubber roller, the contact surface with the paper 4 is pulled in the opposite direction to the rotational direction due to the resistance of the paper 4, causing a deflection 1a at the rear end of the contact surface, which causes wear of the rubber roller 1 and surface deterioration. It was the cause of In addition, the repetition of deformation 1b due to pressure when the paper 4 passes causes plastic deformation and distortion of the rubber roller 1. This is because the pressure applied to the deformed portion 1b does not act as a sufficient restoring force inside the rubber roller, but acts laterally as a deforming force, and the number of times that the elastic deformation of the rubber can be repeated is limited.

That is, the causes of deterioration of the paper feeding roller when paper feeding is repeatedly performed include the following.

- Compression in the radial direction due to pressure contact with the paper - Deformation of the contact part in the opposite transport direction due to friction with the paper - Abrasion of the surface due to friction with the paper Due to these reasons, the paper feed roller: Due to deformation, the radius (distance from the axis) of each part is no longer constant.

- The roller surface becomes brittle and the frictional force decreases.

If a deteriorated paper feed roller is used as it is for paper feeding, the deformation or slippage of the roller will cause a shift in the feeding timing, and the transport speed will become unstable.

・Due to the decrease in frictional force, double-sheet feeding is more likely to occur.

Such adverse effects may occur.

Conventionally, proposals have been made to solve the above drawbacks by embedding linear objects in rollers (Jitsukai Sho.
51-153367), the proposed elastic roll is one in which linear objects are embedded from the roller surface after roller forming.The embedding work is troublesome, and the linear objects are not fixed to the roller core, so the roller When the core material is elastically deformed, it moves along with the deformation, making it unable to fully demonstrate its effect, and also has the disadvantage that it does not have the function of supporting and fixing the elastic covering to the core material.

In order to solve these problems, the purpose of this invention is to provide a rubber roller for paper feeding that has less wear and has high rigidity by enclosing a wire during molding.

(d) Means for solving the problem This invention is a cylindrical or disk-shaped rubber roller in which a rubber layer of a constant thickness is coated around a central metal fitting, which is the roller core material, and the rotation of the central metal fitting is Therefore, in a rubber roller that moves paper, etc. in contact with the surface in its rotation direction, countless wires are embedded in the rubber layer, the inner ends of the wires are glued to the center metal fitting, and the outer ends reach the surface of the rubber layer. The wires are arranged radially from the central metal fitting.

(e) Function The wired paper feeding rubber roller of this invention is
It is composed of countless wires embedded in a rubber layer, and the inner ends of the wires are glued to the central metal fitting.
The outer ends are arranged radially so as to reach the surface of the rubber layer. Adhesion methods include welding, soldering, adhesive bonding, and the like. When paper is fed using this wire-containing paper feeding rubber roller, when the rubber layer is elastically deformed due to the thickness of the paper, the wire also shrinks and strengthens its elastic force, and the tip of the wire slightly catches on the paper, causing friction. It also supplements power. It also prevents the rubber layer from being deformed in the reverse conveyance direction due to friction with the paper, and reduces abrasion of the rubber surface by the paper surface.

Furthermore, even if a strong torque is applied to the rotating shaft, the wire is adhesively fixed to the rotating shaft, so this torque is transmitted to the entire rubber layer, and the bond between the rubber layer and the rotating shaft will not come off.

(f) Embodiment FIG. 1 is a partially cutaway sectional view of a paper feeding rubber roller which is an embodiment of this invention. Inside the rubber roller 1, a central metal fitting 3 and numerous wires 2 whose inner ends are glued are arranged radially, and their tips (outer ends) are on the same plane as the surface of the rubber roller 1. Second
The figure is an external perspective view of the rubber roller 1. The wire 2 and the center fitting 3 are embedded and molded when the rubber roller 1 is molded, and are in close contact with each other. The center fitting 3 and the wire 2 may be bonded together by welding, soldering, adhesive, or the like.

FIG. 3B is an explanatory diagram of the state in which the paper feeding rubber roller is used. In contrast to the conventional paper-feeding rubber roller shown in Figure A, this paper-feeding rubber roller has the following features:
A wire 2 that is in close contact with the rubber roller 1 hooks its tip onto the paper to feed the paper in cooperation with the frictional force of the rubber roller, and also prevents deflection that occurs in the opposite direction to the rotational direction at the contact surface with the paper 4. Also, in the deformed portion 1b, the wire 2 is in close contact with the rubber roller 1, thereby preventing the rubber roller 1 from being deformed in the lateral direction and increasing the restoring force. In addition, since one end of the wire 2 is bonded to the center fitting 3, the wire will not be buried in the rubber layer due to repeated elastic deformation of the rubber layer during use, and the wire 2 itself will be compressed like a spring. The elastic force contributes to the restoration of the rubber roller 1.

(g) Effects of the invention As described above, according to this invention, since the wires are bonded radially to the center metal fitting, the elastic force in the radial direction is strengthened, and the displacement of the surface in the reverse transport direction is reduced.・ Surface wear can be prevented.

Additionally, the tip of the wire subtly catches the paper to prevent the paper from slipping.

Furthermore, since the wire evenly transmits the torque applied to the center metal fitting to the rubber layer, no large force is applied to the contact area between the center metal fitting and the rubber layer, and the center metal fitting and the rubber layer do not separate. .

As a result, when paper is fed, the friction caused by the reinforced elastic force of the enclosed wire and the hooking of the wire tip make it possible to accurately convey the paper and eliminate double-sheet feeding and unfeeding errors.

Furthermore, the increased rigidity provided by the wire reduces wear and plastic deformation of the rubber due to paper feeding, significantly extending the service life of the roller. This has the advantage of making it possible to reduce labor costs for replacement, resulting in substantial cost reductions.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a rubber roller for paper feeding which is an embodiment of this invention, Fig. 2 is an external perspective view of the rubber roller for feeding paper, and Fig. 3B is an explanatory diagram of the state in which the rubber roller for paper feeding is used. Figure A is an explanatory diagram of a conventional paper feeding rubber roller in use. 1...Rubber roller, 2...Wire, 3...Center metal fitting.

Claims (1)

[Scope of Claim for Utility Model Registration] A cylindrical or disk-shaped rubber roller in which a rubber layer of a certain thickness is coated around a central metal fitting, which is a roller core material, and that comes into contact with the surface by rotation of the central metal fitting. In a rubber roller that moves paper or the like in its rotation direction, countless wires are embedded in the rubber layer, the inner ends of the wires are glued to the center metal fitting, and the outer ends of the wires are inserted so that they reach the surface of the rubber layer. are arranged radially from the central metal fitting.