JPS58109353A - Method of manufacturing paper feed roller - Google Patents

Abstract

PURPOSE:To place the peripheral edges of conical parts at equal intervals, by fitting the plural conical parts in prescribed positions along a shaft. CONSTITUTION:Numerous parts 41, 41' shaped as flat truncated cones are mounted on a shaft 42 so that the parts are located in prescribed positions along the shaft by adjuster screws 43, 43' provided at both the ends of the shaft. The peripheral edges 44, 44' of the parts 41, 41' are thus placed in prescribed positions at equal intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a paper feeding roller used in a paper feeding device.

The inventor has previously developed a paper feeding device and has filed a patent application. (Japanese Patent Application No. 56-015051) This paper feeding device is used, for example, to feed cards in computers, etc., and if paper is fed not one sheet at a time but two sheets at a time, the upper This is a paper feeding device that prevents double-sheet feeding by peeling off the lower paper and transporting the upper paper first, followed by the lower paper.

Prior to the description of the present invention, the inventor of the present invention has previously developed and applied for a patent for the paper feeding device shown in FIGS. 1 and 2, and the rollers used therein are shown in FIGS. 3, 4, and 5. This will be explained using figures.

As shown in FIGS. 1 and 2, this paper feeding device moves an upper roller 3 and a lower roller 4 at a point 2 on a transport path 1 for paper P.
The surface of each roller is made to have concavities and convexities alternately corresponding to each other, and the rollers are spaced at an appropriate distance so that when the paper P is sandwiched between these rollers, the convex tips of each roller press against the paper P with an appropriate pressure. The surface of the upper roller 3 is covered with paper P.
and the average coefficient of friction μ.

is coated with a material whose friction coefficient μ is much higher than that of the paper P, and the upper roller 3 is driven in the same direction as the running direction of the paper P at the same surface speed as the running speed. The surface is coated with a material whose average coefficient of friction μ4 with the paper P is smaller than the friction coefficient μ between papers, and the lower roller 4 is moved at a low speed in the opposite direction to the running direction of the paper. It has a structure that allows it to be driven.

The material covering the surface of the upper roller 3 is polyurethane sponge rubber, and has a relatively high friction coefficient with a specific gravity of 0.3 to 0.4 or a hardness of 20 to 40 on the Shore A scale. This is appropriate because μ3 is generated. Furthermore, the lower roller 4 is suitably made of fluororesin or high-density polyethylene, since this produces a relatively low coefficient of friction μ4. As shown in Fig. 3, the lower roller 4 has vertical stripes of 5°, 11 5'... of polyurethane sponge rubber and 6.6'... of fluororesin or high-density polyethylene. By making ... into an appropriate amount of vertical stripes in the same direction as the running direction of the paper P, the friction coefficient μ4
can be set to an appropriate value between μ3 and μ.

Further, FIG. 4 shows a roller structure used in place of the upper roller 3 and lower roller 4, which have corrugated concave and convex portions of appropriate pitches, and the upper roller 13 has a relatively narrow polyurethane sponge rubber disk 16. It has a structure in which spacers 18 having a relatively wide width are arranged alternately, and is used in place of the upper roller 3 described above. Also, the lower roller 14
is a relatively narrow fluororesin disk or high-density polyethylene disk 17 and a relatively wide spacer 1.
It has a structure in which rollers 8 and 8 are arranged alternately, and is used in place of the lower roller 4 described above. When the paper P is fed between the upper roller 13 and the lower roller 14, the lower roller's disk tip is positioned between the disk tips of these upper rollers, and each tip is applied with appropriate contact pressure to the paper P from above and below. Adjust the axial position and axial spacing of the rollers so that it can be pressed with.

Furthermore, in FIG. 5, not only a fluororesin disk or a high-density polyethylene disk 17 but also a polyurethane sponge rubber disk 16 is used for the lower roller 14' to increase the average coefficient of friction from μ,4. The lower roller 14' plays the role of the lower roller 4.The present inventor invented the above-mentioned paper feeding device, and since then he has continued to develop reliable operation in order to keep up with the ever-evolving computer technology. The present invention was developed through research into paper feeding rollers for paper feeding devices.

A method of manufacturing a roller for a paper feeding device according to the present invention will be explained with reference to FIGS. 6, 7, and 8 showing examples thereof.

FIG. 6 shows a cross section of a press used in the present invention.

An inverted truncated conical space 23 is placed above the lower mold 22 having a core 21.
A middle mold 24 is provided, an upper mold 26 having a material supply path 25 is provided on the middle mold, and a saucer guide 27 is provided on the upper surface of the upper mold 26. When an appropriate amount of rubber material or synthetic resin material is supplied to the saucer guide and the plunger 28 is lowered, these materials are supplied into the inverted conical space 23, and are heat-treated under pressure for a certain period of time to form a flat cut. A molded product with a conical head can be obtained.

FIG. 7 shows a molded product obtained by the above press working.

It is a flat truncated cone, has a hole 81 in the center for attachment to the shaft, and the peripheral part 32 can be made to be sharpened to an appropriate degree, and the material is Shore A scale as described above. It can be manufactured from SBR rubber, fluororesin, high-density polyethylene, etc. with a diameter of about 30°.

The outer peripheries can be made to have almost the same diameter, each can be finished with desired hardness and elasticity, and can be manufactured with sufficient durability.

Figures 8a and 8b show a large number of these flat truncated conical molded products 41, 41'... mounted on a shaft 42, and adjusting screws 43, 43 provided on both sides of the shaft. ', these plurality of conical molded products 41, 41' are mounted at predetermined positions in a direction parallel to the axis 42, and therefore, their tips 44, 44'... can be placed in position.

One of the rollers shown in the roller assembly diagram in FIG. 8 is assembled with a conical molded product made of polyurethane sponge material and used as the upper roller 13 of the paper feeding device, and the other is a conical molded product made of fluororesin or The lower rollers 14, 14' are assembled using high-density polyethylene cone moldings, and if necessary, polyurethane sponge cone moldings are also added.
By using it as a roller, it can be used as a roller for a paper feeding device that operates accurately.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory views of a paper feeding device that was previously invented and developed by the present inventor. FIG. 3 is an explanatory diagram of the roller used in the paper feeding device developed earlier by the present inventor. FIGS. 4 and 5 are also explanatory diagrams showing examples of rollers used in the paper feeding device previously developed by the present inventor. FIG. 6 is an explanatory diagram of a press machine for producing a flat truncated conical molded product necessary for assembling the roller of the present invention. FIG. 7 shows an embodiment of a flat truncated cone-shaped article used in assembling the roller of the present invention. FIGS. 8a and 8b both show partially sectional side views of a roller for a paper feeding device according to the present invention. P is paper, 1 is a paper transfer path, 2 is a point on the transfer path, 3 is an upper roller, 4 is a lower roller, 5 is a vertical strip of polyurethane sponge rubber, 6 is a vertical strip of fluororesin or high-density polyethylene, 21 is the core, and 22 is the lower mold. 23 is an inverted truncated cone-shaped space, 24 is a medium size, 25 is a material supply path, 26 is an upper mold, 27 is a saucer guide 128 is a plunger, 31 is a hole, 32 is a peripheral part, 41 is a flat truncated cone Molded product, 42 is the shaft, 43 is the adjusting screw 44 is the tip of the conical molded product, Figure 1, Figure 7, Figure 3, Figure 5, Figure 6.

Claims (1)

[Scope of Claims] The central shaft portion has a hole $1, and the circumferential portion 32 is a flat truncated conical shaped product 41 with a slightly pointed point. A large number of flat truncated cone-shaped molded products 4'1 are molded to desired hardness and elasticity by press working or injection molding using a rubber material or synthetic resin material.
, 41'... are attached to the shaft 42, and the tips 44°, 44'... of each cone molded product are positioned at the specified position by adjusting screws 43, 43' on both sides of the shaft. How to make a roller for paper fist feeding.