JPS6034450B2 - Rubber belt manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a method for manufacturing an elastic rubber belt suitable for reading and conveying banknote magnetic cards in currency exchange machines, cash dispensing machines, etc., and the present application relates to a method for manufacturing an elastic rubber belt suitable for reading and conveying banknote magnetic cards in currency exchange machines, cash dispensing machines, etc. It also eliminates the disadvantage of V-belts, where even a little wear on the sides of the belt causes the belt to sink deeply into the V-pulley, which greatly changes the rotational speed and belt running surface. This belt relates to a belt that guarantees a constant conveyance speed without slipping by embedding bodies spirally at equal pitches.

The present application relates to a so-called T-shaped belt that takes advantage of the characteristics of a flat belt and a V-belt. It is characterized in that a protrusion 3 is provided, and reinforcing core bodies 4 are buried spirally at equal pitches in the center of the flat part of the belt.

However, even with this T-shaped belt, lateral vibration of 0.4 to 0.7 degrees may occur in the middle direction during driving, which causes inconvenience in reading cards and the like. As a result of various studies conducted by the inventors regarding the cause of this problem, it has been found that the reinforcing core body is embedded in uneven positions within the belt and is caused by elongation of the reinforcing core body during driving. The present application relates to an invention that improves this drawback, and the problem is that the buried position of the reinforcing core in the belt is the cause of bulk. When forming the reinforcing core in a spiral shape on the surface of the unvulcanized rubber layer using a thread winding machine, the viscosity of the unvulcanized rubber layer is low, so the winding tension causes it to bite into the rubber layer. It was discovered that the reinforcing core was buried in a barracks.

The present application completely eliminates this variation, and represents a very large inventive step. In other words, at the molding stage,
By semi-vulcanizing and polishing the surface, the variation in thickness can be suppressed to 1/10 of the original thickness. The unvulcanized rubber layer is heated under pressure to semi-vulcanize the unvulcanized rubber layer. The time for semi-vulcanization at this time varies depending on the type and composition of the rubber, but it is usually sufficient to perform the semi-vulcanization for 10 minutes at a steam pressure of 4k9/carp. After demolding, it is easy to perform surface polishing to suppress the variation in wall thickness to 1'10.

By winding the reinforcing core in a spiral shape at equal intervals on the surface of this semi-vulcanized rubber cylinder using a thread winder, the buried position of the core can be fixed. Furthermore, unvulcanized rubber is coated on top of it, and pressure is applied.
Heat and vulcanize to proper vulcanization. In this case, it is usually sufficient to use a steam pressure of 4k9/ground for 60 minutes. After that, the belt is polished so that a protrusion 3 is provided at the center of the back surface 2 of the flat part 1 along the entire circumference in the longitudinal direction of the belt, and the belt is cut off as required to produce a product.

With T-shaped belts manufactured in this way, there is no biting into the unvulcanized rubber, so the position of the reinforcing core 4 of the belt is always constant and aligned, so the horizontal vibration during driving is at most 0.1 It is only about the size of the ribs and rarely occurs. The reinforcing core used here is preferably one selected from cotton yarn, polyester yarn, aromatic polyamide yarn, glass fiber, etc., with a four-way stretch, twisted yarn, and filament yarn. The pitch is 0.3 to 1. All you have to do is choose from the range of the ship.

[Brief explanation of the drawing]

The figure is a partially sectional and partially enlarged perspective view of a belt according to the present invention. 1... Flat part, 2... Back part, 3...
... Protrusion, 4... Reinforcement core.

Claims (1)

[Scope of Claims] 1. An unvulcanized rubber layer formed to an appropriate thickness on a vulcanized core metal using a press machine or the like is pressurized and heated to semi-vulcanize the unvulcanized rubber layer, and after demolding,
On the surface of the semi-vulcanized rubber cylinder, which had been polished to the required dimensions, reinforcing cores were formed in a spiral shape at equal intervals using a thread winding machine, which was then covered with unvulcanized rubber and vulcanized under pressure and heat until it was properly vulcanized. After that, by polishing and cutting the center part of the back surface 2 of the flat part 1 into a shape in which a protrusion 3 is provided around the entire circumference in the longitudinal direction of the belt, the reinforcing core 4 of the belt is substantially formed. A method for manufacturing a rubber belt characterized by having constant and aligned positions. 2. The method for manufacturing a rubber belt according to claim 1, wherein the reinforcing core is selected from twisted yarns and filament yarns with low elongation, such as cotton threads, polyester threads, aromatic polyamide threads, and glass fibers. 3 The winding pitch of the reinforcing core on the semi-vulcanized rubber surface is 0.
．． The method for manufacturing a rubber belt according to claim 1, wherein the rubber belt has a thickness in the range of 3 to 1.0 mm.