JPH0460903B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a feed roller for thin materials such as paper, film, sheets, cloth, etc., and a method for manufacturing the same.

[Problems to be solved by conventional technology and invention]

Conventionally, in this type of roller, for example, as shown in FIG. A type in which short tubular non-slip members 10 made of rubber are fitted and covered on the outer periphery of a plurality of locations is known. However, in order to fit and cover the non-slip member 10 onto the thick tube 8, this method employs a method of fitting and covering the entire length of the thick tube 8 with a rubber tube and then cutting off the unnecessary portion 8'. Therefore, not only is there a waste of material, which is uneconomical, but also the work of securing the end caps 9, 9' to the shaft 5, the work of fitting the thick pipe 8 to the end caps 9, 9', and the non-slip member 10 for the thick pipe 8 are required. Since the covering work and the cutting out of unnecessary parts were done separately, the products were slightly uneven and unstable, and defective products were often produced.In addition, as mentioned above, a lot of work was required. Therefore, it is unsuitable for increasing mass production, and it has drawbacks such as there are limits to cost reduction.

[Means for Solving the Problems] The present invention attempts to eliminate the above-mentioned defects by providing a dedicated two-color injection molding machine and producing using the same.

〔Example〕

The embodiments of the present invention will be described with reference to the drawings.
First, the inner tube part 1 for the boss function and the outer tube part 2 for the rim function.
and a cavity of the hollow cylindrical part 4 formed by the arm function rib part 3, and a holding part for holding the shaft 5 as an insert on the center line of the above-mentioned inner tube part forming part in the cavity. A rubber or soft synthetic resin comprising an injection molding device for partial molding (not shown) and cavities for short tubular non-slip portions 6 that are immovably attached to the outer periphery of the hollow cylindrical portion 4 at multiple locations. , a two-color injection molding machine (not shown) equipped with an injection molding device (not shown) for partially molding a material such as a foam material having a large coefficient of friction and a slight elasticity; After the shaft 5 is held in the apparatus, hard plastic is poured into the plastic part to complete the molding of the plastic part, and the plastic part is immediately injected with rubber, soft synthetic resin, etc. using the latter injection molding machine.
The short tubular non-slip portion 6 is made of a material such as foam that has a large coefficient of friction and has slight elasticity.

[Action and effect of the invention]

Since the present invention is as described above, a hollow cylindrical part made of hard plastic is formed of an inner pipe part for a boss function, an outer pipe part for a rim function, and a rib part for an arm function, and both ends are attached to the inner pipe part. A metal shaft that is inserted in a protruding state and cannot be removed or rotated, and rubber, soft synthetic resin, foam, etc. that are immovably attached to the outer periphery of the hollow cylindrical part at multiple locations. It is possible to manufacture a feed roller constructed with a short tubular non-slip part made of a material with a large coefficient of friction and a slight amount of elasticity. Fig. 1 shows a type in which the thick pipe 8 is covered and fixed via the disc-shaped end caps 9 and 9', and short rubber tubular non-slip members 10 are fitted and covered on the outer periphery of the thick pipe 8 at multiple locations. As is clear from the above, there is a closed hollow part (which is necessarily provided for weight reduction) inside the thick pipe 8, which hinders the molding process. It was unsuitable. In other words, the present invention has the remarkable effect that it can be manufactured using a molding method suitable for increasing mass production and reducing costs. Furthermore, since a two-color injection molding machine is used as described above, it has an excellent effect of economically and reliably producing uniform and stable products without wasting materials. Furthermore, in the conventional shaft 5, the portion existing between the end caps 9 and 9' is in a horizontal suspension state floating in the air, and there is a risk of bending, and the part of the shaft 5 that exists between the end caps 9 and 9' may be bent, and it may float away from the object to be fed during feeding operation and the feeding function may be impaired. In contrast, the product according to the present invention has an inner pipe section for boss function and a rib section for arm function, and has sufficient strength, so that it is possible to avoid problems such as insufficient feeding function. Not only is there no danger, but the hollow cylindrical part of this product is made up of an inner pipe part for the boss function, an outer pipe part for the function function, and a rib part for the arm function, so sink marks are unlikely to occur during molding. It has a shape and has favorable effects.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing the conventional one, Fig. 2 is a partially cutaway front view showing the inventive one, and Fig. 3 is a partially cutaway front view showing the conventional one.
The figure is an enlarged sectional view taken along the line A-A in FIG. 2. 1...Inner tube part, 2...Outer pipe part, 3...Rib part, 4...Hollow cylindrical part, 5...Shaft, 6...Slip part, 8...Thick pipe, 8'...Unnecessary part, 9, 9'... End cover, 10... anti-slip member.

Claims (1)

[Scope of Claims] 1. A hollow cylindrical part made of hard plastic formed of an inner pipe part for a boss function, an outer pipe part for a rim function, and a rib part for an arm function, and both ends protruding from the inner pipe part. The friction coefficient of the metal shaft inserted in a state that cannot be removed or rotated, and the rubber, soft synthetic resin, foam, etc. that is immovably attached to the outer periphery of the hollow cylindrical part at multiple locations. 1. A thin material feeding roller comprising a short tubular non-slip portion made of a material having a large diameter and a slight elasticity. 2 Insert the shaft onto the center line of the cavity of the hollow cylindrical part formed by the inner pipe part for the boss function, the outer pipe part for the rim function, and the rib part for the arm function, and the molded part of the inner pipe part in the cavity. An injection molding device for molding a hard plastic part, which is equipped with a holding part for holding the product, and a rubber having cavities for short tubular non-slip parts that are immovably attached to the outer periphery of the hollow cylindrical part at multiple locations. , a two-color injection molding machine equipped with an injection molding device for partially molding materials such as soft synthetic resins and foams having a large coefficient of friction and a slight elasticity, and a shaft held in the former injection molding device. Later, hard plastic is poured in to complete the molding of the plastic part, and the plastic part is immediately molded into a material with a high coefficient of friction and slight elasticity, such as rubber, soft synthetic resin, or foam, using the latter's injection molding equipment. A method for manufacturing a thin feed roller characterized by forming a short tubular non-slip part.