JPH0263728A - Seamless belt - Google Patents

Abstract

PURPOSE:To obtain a seamless belt simple to prepare and having no possibility of release by stretching a cylindrical body obtained by molding a thermoplastic elastomer or resin to the peripheral direction thereof and polishing the stretched one if necessary. CONSTITUTION:For example, a polyurethane elastomer is used as a raw material and molded into a cylindrical body 1 by a molding machine. This cylindrical body is subjected to stretch molding in ratio of 10 - 500% under a temp. condition of heat-deformation temp. + or - 50 deg.C or an m.p. + or - 100 deg.C by a stretching machine to obtain a stretched body 2. After the surface of the stretched body is polished, said stretched body is turned over and a grindstone having a plurality of recessed grooves cut therein in the peripheral direction is applied to the stretched body to allow a plurality of ridge bodies 4a to protrude from the surface thereof and the stretched body is cut centering around the ridge body to obtain a seamless belt 5 having a T-shape cross-section.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a seamless belt suitable as a belt used for reading and conveying banknotes and magnetic cards in currency exchange machines, cash dispensers, card telephones, and the like.

<Prior art> Belts for reading and transporting banknotes and magnetic cards in currency exchange machines, cash dispensing machines, card telephones, etc. have no horizontal vibration of the belt itself and no slipping with pulleys, so the transport speed is constant. It is required to be able to maintain And, as a product that satisfies such requirements, there is
As shown in Japanese Patent No. 450, a so-called T-shaped belt is known which has a T-shaped cross section and a reinforcing core to prevent stretching.

<Problems to be Solved by the Invention> The T-shaped belt described above is first coated with unvulcanized rubber on the core, then semi-vulcanized and polished, and then a reinforcing core is spirally wound on top of it. After rolling, it is treated with adhesive, further coated with rubber, then subjected to main vulcanization, further polished and cut.

Since the conventional T-shaped belt has a reinforcing core as described above, there is a problem in that the manufacturing process is multi-step and complicated. In addition, Japanese Patent Application Laid-Open No. 62-286730 proposed manufacturing by press molding, but it is still not satisfactory. Furthermore, since conventional belts are formed by adhering two rubber layers with a reinforcing core layer as a boundary, there is a risk that the belt may peel off at the boundary between the two layers.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a seamless belt that is easy to manufacture and is free from peeling.

Means for Solving the Problems> A seamless belt according to the present invention that achieves the above object comprises stretching a cylindrical body formed from a thermoplastic elastomer or a thermoplastic resin in the circumferential direction and polishing it as necessary. It is characterized by being

The thermoplastic elastomers used in the present invention include polyurethane-based, polyester-based, polyamide-based, and ethylene-based elastomers.
Vinyl acetate type, fluororubber type, etc. can be mentioned, and the thermoplastic resin can include polyethylene, polypropylene, polyamide, polyetherketone, polyetherimide, etc.

The seamless belt according to the present invention may be manufactured using these materials, for example, by the steps shown in FIG. As shown in the figure, first, a cylindrical body 1 is formed by extrusion molding or injection molding using the above-mentioned material.

Next, using a device as shown in FIG. 2, for example, the cylindrical body 1 is stretched in the circumferential direction to form a stretched body 2.

The apparatus shown in FIG.
12 and the cylindrical body 1 that is spun by these rollers 11 and 12
First and second rubber pressers 13, 14 that hold down the
and a tension roller 15 that pulls the cylindrical body 1 placed on the rollers 11 and 12 outward so as to eliminate the slack, and while applying tension to the cylindrical body 1 with the tensile roller 15. , first and second rollers 11
, 12 with v, , v2(v,) y,), respectively, to stretch the cylindrical body 1.

Note that the slack in the cylindrical body l caused by the difference in speed of v, , v2 can be absorbed by the outward movement of the tensile roller 15. Also, V2/V,
is the stretching ratio.

For example, stretching using such a device can be carried out at a temperature of ±50°C at the thermal deformation temperature of the material, such as when the Young's modulus is 4 or 6 kg/c+/, or at a temperature of ±100°C at the melting point.
This may be done so that the ratio is 500%. In the case of the apparatus shown in FIG. 2, the temperature may be up to about 150°C; or the entire apparatus may be placed in an atmosphere at that temperature; however, in the case of higher temperature conditions, heaters are installed in the first and second benders 11 and 12. It is best to set and use it. The belt stretched in this manner has a high Young's modulus, and even without a reinforcing core, there is no concern about elongation (and efficient and stable conveyance can be performed).

Here, to illustrate the heat distortion temperature (when Young's modulus is 4.6 kg/cd) and melting point of thermoplastic elastomer and thermoplastic resin as t, polyurethane elastomer: melting point 15
0 to 210°C; polyester elastomer bithermal deformation temperature 65 to 140°C, melting point 198 to 223°C: polyamide elastomer, f1 point 150 to 171°C; ethylene-vinyl acetate elas 1-mer; melting point 160 to 180°C
; Fluororubber system: melting point 160-220°C; polyethylene: heat distortion temperature 70-90°C, melting point 135°C; polypropylene:! @Deformation temperature 80-130℃, melting point approximately 1.70℃
; Polyamide: Heat distortion temperature: 110 to 230°C; Polyetheretherketone: Heat distortion temperature: 152°C or higher; Polyetherimide: Heat distortion temperature: 210 to 216°C.

The surface of the elongated body 2 thus formed is polished with a grindstone to form a polished body 3. Next, it is turned over and grooves for forming convex stripes on the inner circumferential surface of the T-shaped belt are polished on the surface thereof to obtain a grooved body 4. This groove 4a can be easily formed by using a grindstone having a large number of grooves formed in the circumferential direction. Then, by cutting this grooved body 4 into a predetermined width, a seamless belt (1-shaped) is formed.
5.

This seamless belt 5 is used by turning it over with the convex strips 5a facing inside. Of course, it goes without saying that the abrasive body 3 may be first cut into the cut bodies 6 and then polished to form the seamless belt 6. Here, an example of a single-shaped bell 1- having a convex body 5a on the inner surface in the center has been given, but by applying the present invention, various cross-sections such as a bell having convex stripes on both sides in the width direction can be made. Can you manufacture a belt with the shape of

Practical example Hereinafter, the present invention will be explained based on Examples.

As a raw material, polyurethane elastomer (Product 82 Pelecene; Kasei Upjohn■) is used, and Toshiba 8N machine (
Inner diameter 60III with Gou's l550EP injection molding machine
A cylindrical body of IIφ, 4 mm thick, and 50 mm long was molded.

This cylindrical body is stretched by a stretching machine as shown in FIG.
It was stretch-molded in an atmosphere at 0°C with a stretch ratio of v2/vt = 4, and had an inner diameter of 150 mm, a thickness of about 2 mm, and a length of 4 mm.
A stretched body of 0 mm was obtained. The Young's modulus of the cylindrical body before stretching is approximately 5.0 g/cnl! However, the Young's modulus of the stretched body is 13. It was Okg/a/.

After polishing the surface of this stretched body to a thickness of 1.5 threshold, it was turned over and polished using a grindstone with a plurality of concave grooves cut in the circumferential direction.
A plurality of convex stripes protruding by 0.6 m were formed on the surface at 10 side intervals.

A seamless belt having a T-shaped cross section was obtained by cutting the strip into a width of 10 mm with the convex strip as the center.

When this seamless belt was turned over and used in a test machine, stable conveying force was obtained. Further, no elongation was observed after long-term use.

<Effects of the Invention> As explained above, the seamless belt of the present invention has a high Young's modulus even without a reinforcing core, can be easily manufactured, has no fear of peeling, and can be used, for example, in a money changer, Suitable as a single-shaped belt for cash dispensers and card phones.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing an example of the manufacturing process of a seamless belt of the present invention, and FIG. 2 is a perspective view showing an example of a stretching machine. In the drawings, 1 is a cylindrical body, 2 is a stretched body, 3 is a polishing body, 4 is a grooved body, 5 is a seamless belt, and 6 is a cut body. Figure 2

Claims (1)

[Scope of Claims] 1) A seamless belt made by stretching a cylindrical body made of thermoplastic elastomer or thermoplastic resin in the circumferential direction and polishing the belt as necessary. 2) The seamless belt according to claim 1, wherein the stretching is carried out at a temperature of ±50°C of heat deformation temperature or ±100°C of melting point at a rate of 10 to 500%.