JPH0735102B2 - Method for manufacturing V-ribbed belt having transfer mark - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a V-ribbed belt having a transfer mark, and more particularly to a method for manufacturing a V-ribbed belt having a transfer mark having no step on the back surface of the belt.

[0002]

2. Description of the Related Art As a method of printing a mark on the back surface of a conventional power transmission belt, a transfer mark in which an unvulcanized color rubber to be a mark is attached on a base material made of a transparent synthetic resin film is used. , After sticking to the molding drum, fit the rubber covered canvas, wrap the stretched rubber layer, the core wire and the compressed rubber layer, then fit the jacket and vulcanize, and transfer from the vulcanized belt sleeve. By peeling off the mark film, the mark was transferred to the surface of the rubber covered canvas. The V-ribbed belt was obtained by polishing the compressed rubber layer of the belt sleeve thus obtained into a V-groove shape and cutting it into a predetermined width.

[0003]

However, during vulcanization, since the base material and the rubber of the transfer mark raised from the base material are pressed into the back surface of the belt sleeve, a step after the base material is stripped off on the back surface. The pattern was formed and the marked area was slightly depressed. That is, a step was formed on the back surface of the belt between the area where the mark was transferred and the area where the mark was not transferred, and the surface was not flat. A recent V-ribbed belt is used for driving an auxiliary machine of an automobile, and particularly, it is wound in a serpentine shape by multi-axis drive, and there is an uneven surface on the back surface of the belt for engaging a tensioner on the back surface of the belt. Said the tensioner was vibrating and making noise. Not only that, but also in the case of driving the back surface of the belt using the back surface of the belt, there is a problem that noise when driving the belt becomes large. Further, when the synthetic resin film is made thin, wrinkles may occur on the transferred marks.

SUMMARY OF THE INVENTION The present invention solves such problems, and an object of the present invention is to provide a method of manufacturing a V-ribbed belt having a flat surface by eliminating a step between a mark transfer area and a non-transfer area on the back surface of the belt. To do.

[0005]

That is, in the method of manufacturing a V-ribbed belt having a transfer mark according to the present invention, a transfer mark material having a mark adhered on a base material and a canvas containing an unvulcanized rubber, Overlap so that the mark faces the canvas,
After this is heated and pressed, the base material is peeled off and the mark is transferred to the canvas, and the canvas, the rubber layer, the core wire, etc. are placed so that the mark transferred to the canvas is located on the innermost or outermost side of the forming drum. A method of laminating and vulcanizing these integrally to form a belt sleeve, providing at least one V-shaped groove portion in the rubber layer of the belt sleeve along the belt width direction, and cutting to a predetermined width. It is in.

[0006]

In the method of manufacturing the V-ribbed belt described above, the transfer mark material and the canvas are superposed and heated and pressed to transfer the mark of the transfer mark material into the depression of the canvas to form the canvas. By vulcanizing the resin on the innermost side or the outermost side of the drum, a belt back surface having a flat mark having no step between the marked area and the unmarked area is obtained. As a result, even if the auto tensioner is engaged with the back surface of the V-ribbed belt, the tensioner does not vibrate significantly and the noise is low.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a transfer mark material used in the V-ribbed belt manufacturing method of the present invention.
3 to 3 show a step of transferring a mark to a canvas, and FIGS. 4 to 5 show a step of the method of the present invention.
According to this, the transfer mark material 1 used in the method for manufacturing the V-ribbed belt of the present invention is one in which the mark 3 is attached on the base material 2, and the base material 2 is made of a transparent material such as nylon, polyester, or acetate. This is a synthetic resin film or release paper, which usually has a thickness of about 0.01 to 0.1 mm and does not undergo plasticization or heat shrinkage during vulcanization. When the base material 2 is thermoplasticized or heat-contracted, the mark 3
It is obvious that is deformed. Further, if the synthetic resin film is less than 0.01 mm, wrinkles occur in the transferred marks.

On the other hand, the mark 3 is usually an unvulcanized color rubber composition, for example, rubber such as NR, CR and SBR, and a vulcanizing agent,
It is a resin composition containing a vulcanization aid, a pigment or the like, or a resin composition.

As in the marking step shown in FIG. 2, the above transfer mark material 1 is superposed on an unvulcanized rubber cloth 4 which is endless with a stepless joint such as a sewing machine or heat-sealing. It is installed on the press plate 5 so that the mark 3 faces the canvas 4. Then, this superposed product is 100 to 140 ° C, preferably 120 to 1
10 to 30 seconds at 30 ° C, preferably 15 to 25 seconds,
The mark 3 is transferred to the canvas 4 by being sandwiched between the upper and lower press plates 6 and 5 and heated and pressed at 2.0 to 3.0 kg / cm ² . In this heating and pressing step, the rubber attached to the mark 3 and the canvas 4 is in an unvulcanized state. When the canvas 4 is pressed under heating, the warp and the weft are displaced and the mark 3 is pressed into the recess formed between the yarns to form a relatively flat surface.

The canvas 4 is preferably made of cotton, nylon, polyester, vinylon or the like, and is preferably a stretchable canvas having a crossing angle of 90 to 150 ° as a crossing angle between the warp and the weft. Sulfur rubber is friction or coated.

The marking step in the present invention is not limited to the method of transferring the mark 3 to the endless canvas 4, and for example, as shown in FIG. 3, the unvulcanized rubber is rubbed on the canvas 4 by a calendar roll 15. It is also possible to transfer the mark 3 to the canvas 4 by putting the transfer mark material 1 on the canvas 4 and sandwiching the transfer mark material 1 between the upper and lower press plates 6 and 5 by heating and pressurizing under the same conditions as described above. During this heating and pressurization, the canvas 4 is given a certain tension by the movement of the tension rolls 17 located between the guide rolls 16, 16. The canvas 4 obtained by this method is cut into a predetermined length and then made endless.

Further, as another marking step, as shown in FIG. 4, after rubbing unvulcanized rubber on the canvas 4 to cause friction, the canvas 4 is cut into a predetermined length, Is placed on the lower press plate 5, the transfer mark material 1 is placed so that the mark 3 faces the canvas 4, sandwiched between the upper and lower press plates 6 and 5, and heated and pressed under the same conditions as described above, and the mark 3 is printed on the canvas. 4 can also be transferred. After the transfer, this canvas 4 is made endless. Of course, the marking of the present invention can be performed not only by friction but also after the coating, soaking, spreading, cutting and winding steps and before the canvas 4 is made endless.

When this is completed, the base material 2 is peeled off, the endless canvas 4 is fitted into the forming drum 7, and at least N
A stretched rubber layer 8 made of a rubber selected from R, SBR, CR and the like is wound, and a core wire 9 made of polyester fiber and aramid fiber cord is spirally spun, and the same rubber as the stretched rubber layer 8 is nylon, The compression rubber layer 10 in which short fibers such as polyester and aramid fibers are arranged in the width direction is wound, and the molding is finished. After that,
The molding drum 7 is placed in a vulcanizing can by a usual method to vulcanize the belt sleeve 11. During the vulcanization, the transferred mark 3 is pressed by the molding drum 6 and partially penetrates into the depression of the canvas 4, and becomes the same surface as the area without the mark, and becomes a flat surface with no step.

The above-mentioned molding method is reverse molding, but may be normal molding. That is, the compression rubber layer 10 is formed on the molding drum 7,
The core wire 9, the stretch rubber layer 8, and the canvas 4 may be laminated. In this case, the mark 3 in close contact with the canvas 4 is located on the outermost side of the forming drum 7.

The vulcanized belt sleeve 11 thus obtained is extracted from the molding drum. When the multi-ribbed belt 12 as shown in FIG. 7 is formed, the reversely formed belt sleeve is ground into a plurality of V-shaped grooves by using a grinder equipped with a plurality of circular V-shaped grooved grindstones. After doing
Cut into a specified width and finish into individual belts. When forming a low edge belt, a belt sleeve that has been positively formed is cut into a V-shaped cross section using a cutting machine.

FIG. 7 is a partial cross-sectional perspective view of a multi-ribbed belt obtained by using the method of the present invention. The multi-ribbed belt 12 includes a stretch rubber layer 8 and polyester fibers and aramid fibers embedded in this layer. A compressed rubber layer 10 having a core wire 9 made of a cord and a plurality of V-shaped grooves 13 extending in the belt circumferential direction on the lower surface is formed, and a short rubber such as nylon, polyester, aramid, or cotton is formed in the compressed rubber layer 10. The fibers are arranged in the belt width direction. On the back surface 14 of the belt, there is no step at the boundary between the area with the mark 3 and the area without the mark 3, and it is extremely flat, and even when the tension pulley is engaged with the back surface 14, it smoothly rotates and does not vibrate.
Resonance noise is also reduced.

[0018]

As described above, according to the method of the present invention, after the canvas and the transfer mark material are superposed on each other, they are heated and pressed to transfer the mark of the transfer mark material in a state where the mark of the transfer mark material is inserted into the depression of the canvas, By vulcanizing this canvas located on the innermost or outermost side of the forming drum, a flat surface having no step is formed between the region having the mark and the other region, and the mark is the rubber of the fabric. It strongly bonds with and exhibits a clear pattern.

[Brief description of drawings]

FIG. 1 is a perspective view of a transfer mark material used in the present invention.

FIG. 2 is a diagram showing a step of superposing a transfer mark material and a canvas and heating and pressing the same in the marking step of the present invention.

FIG. 3 is a diagram showing another marking process of the present invention.

FIG. 4 is a diagram showing still another marking step of the present invention.

FIG. 5 is a diagram showing a step of inserting the canvas on the forming drum, which is a step of the present invention.

FIG. 6 is a sectional view when a belt sleeve is molded on a molding drum in the process of the present invention.

FIG. 7 is a partial cross-sectional perspective view of a multi-ribbed belt obtained by using the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transfer mark material 2 Base material 3 Mark 4 Canvas 7 Molding drum 8 Extension rubber layer 9 Core wire 10 Compression rubber layer

Claims (1)

[Claims] 1. A transfer mark material having a mark adhered to a base material and a canvas containing unvulcanized rubber are superposed so that the mark faces the canvas, and the base is prepared by heating and pressing the mark. The material is peeled off and the mark is transferred to canvas, and the canvas, the rubber layer and the core wire are laminated in combination so that the mark transferred to the canvas is located on the innermost or outermost side of the molding drum, and these are laminated. A belt sleeve is manufactured by integrally vulcanizing, and at least one V-shaped groove is provided in the rubber layer of the belt sleeve along the belt width direction, and the belt sleeve is cut into a predetermined width. Manufacturing method of V-ribbed belt.