JP3361074B2 - Manufacturing method of V-belt with ridge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mountain V belt which is used for agricultural machines such as combine harvesters, harvesters and binders and is mainly used for conveying straws such as rice, wheat and corn.

[0002]

2. Description of the Related Art Generally, a V-belt with a mountain having a mountain-shaped protrusion on the back side of a wrapped V-belt for transmission is often used in the process of scooping and conveying agricultural products such as straws. This situation will be described with reference to FIG.

A plurality of driving devices for the mountain V belt 1 are run in parallel, and the straws are horizontally stabilized by utilizing the mountain projections 3 having a predetermined pitch formed on the back surface of the mountain V belt 1. It is to be scooped in and transported in the state of being.

Here, an outline of the V-belt with a mountain 1 is shown in FIG.
Will be explained. In FIG. 2, a V-belt with a ridge 1 is composed of a ridge-shaped projection piece 3 and a wrapped V-belt 2 which is a base belt for mounting the ridge-shaped V-belt.
The belt 2 is composed of a stretched rubber layer 2a, a cord rope 2b, a compressed rubber layer 2c, and a cover canvas 2d that covers these from the outside.

Conventionally, the V-belt with ridges 1 has been manufactured by subjecting the wrapped V-belt 2 manufactured using a production line for the transmission wrapped V-belt 2 to secondary processing.

That is, the wrapped V-belt 2 is inserted into a predetermined ring-shaped mold (not shown), and a predetermined number of mountain-shaped cavities provided on the outer peripheral surface of the wrapped V-belt 2 are filled with unvulcanized rubber. Mountain-shaped protrusions 3 on the back of the unit at a specified pitch
The V-belt with ridges 1 was manufactured by integrally vulcanization molding by heating and pressing.

However, in this manufacturing method, the adhesive interface of the mountain-shaped projection pieces 3 has a low elastic rubber and a high elastic cover canvas 2.
Adhesion with d was caused, and due to this difference in elasticity, it was not possible to follow the change in bending stress during running, and as a result, an early peeling phenomenon occurred.

Therefore, as disclosed in Japanese Utility Model Laid-Open No. 62-53213, the cover canvas 2d is stripped off to expose the stretched rubber layer 2a under the cover canvas, so that the rubber surface has a mountain-shaped uncovered surface. A method of forming the mountain-shaped projection pieces 3 by integrally vulcanizing and molding a vulcanized rubber has been adopted.

[0009]

However, in this method, it was essential to strip off the cover canvas 2d located on the back surface of the wrapped V-belt 2 shown in FIG.

That is, as shown in FIG. 10, the left and right corners of the cover canvas 2d located on the back surface of the wrapped V-belt 2 are ground or cut by skives, and then the cover canvas 2d is physically peeled and removed. The method of doing was generally done.

However, the above physical peeling method is
The work is unstable and difficult, and problems such as poor smoothness of the peeling interface are included, and improvement thereof has been strongly desired.

[0012]

Therefore, the present inventor has invented a novel method for easily removing the cover canvas 2d on the back surface, and will be described below.

That is, according to the first aspect of the invention, an unvulcanized rubber sheet is wound around the outer peripheral surface of a cylindrical molding drum, a cord rope is wound around it in a spiral shape, and the unvulcanized rubber is further wound thereon. A first step of winding the sheet, and finally forming a release tape on the outer periphery of the release tape to form an unvulcanized belt sleeve,
The unvulcanized belt sleeve is removed from the forming drum, skived into an unvulcanized belt molded body having a predetermined cross section, and a rubber covered canvas is wrapped around the outer circumference of the unvulcanized belt molded body to form a non-vulcanized belt molded body. Forming a vulcanized belt molding
Step 2, a third step of inserting the unvulcanized belt molded body with the all-round cover canvas into a predetermined mold, and vulcanizing and molding the wrapped V-belt by heating and pressurizing, and the back surface of the wrapped V-belt. In this case, the left and right corners on the side where the release tape is embedded are cut at a predetermined angle by at least the thickness of the cover canvas, the cover canvas is peeled off together with the release tape, and the V-belt with rubber exposed on the back surface And a fifth step of integrally vulcanizing and molding mountain-shaped projection pieces at a predetermined pitch on the back surface of the V-belt where the rubber is exposed. .

A second aspect of the present invention is the method for producing a V-belt with a mountain according to the first aspect, wherein a resin tape made of polypropylene, polyester, cellophane tape, or paper tape is used as the release tape.

A third aspect of the present invention is the method for producing a V-belt with a ridge according to the first aspect, wherein the release tape is spirally wound around an unvulcanized rubber sheet.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The manufacturing method of the present invention will be described in detail below with reference to the drawings. First, the first step, that is, the method for forming the unvulcanized belt sleeve 2'will be described with reference to FIGS.

According to the method, first, an unvulcanized rubber sheet 2c is wound around a molding drum (not shown), and a cord rope 2b is placed on the winding drum.
Is spirally wound at a predetermined pitch, the unvulcanized rubber sheet 2a is further wound thereon, and finally the release tape 4
Is wound to form an unvulcanized belt sleeve 2 '.

A cross-sectional view of the unvulcanized belt sleeve 2'according to the present invention around which the release tape 4 is wound, and a cross-sectional view of the conventional unvulcanized belt sleeve 2'without using the release tape 4 are shown. Are shown in FIGS. 3 and 8, respectively.

As described above, the method according to the present invention is characterized in that a work step of further laminating and sticking the release tape 4 on the unvulcanized rubber sheet 2a is added. A new effect described later can be obtained.

In the second step, the wide unvulcanized belt sleeve 2'is skived into a narrow unvulcanized belt sleeve 2'having a trapezoidal cross section of a predetermined width, and a predetermined number of sheets are formed all around. This is the process of winding the cover canvas.

The release tape 4 used in the present invention is
It is adhered to the unvulcanized rubber sheet 2a with sufficient adhesive force, and is devised so that the release tape 4 does not peel off during skiving.

In the third step, the unvulcanized belt molded body 2 having a trapezoidal cross section in which the cover canvas 2d is wrapped around the entire circumference in FIG. 4 is inserted into a predetermined mold, and is heated and pressed to a predetermined wrapped V-belt. This is a step of vulcanization molding into 2.

The fourth step is the vulcanized wrapped V
This is a step of peeling the back cover canvas of the belt. To be more specific, first, at least the left and right corners of the vulcanized wrapped V-belt 2 in FIG. Only the entire length is skived at a predetermined angle, or the entire length is removed by polishing.

After that, the release tape 4 is peeled off at the interface with the stretched rubber layer 2a, whereby the stretched rubber layer 2a is removed.
Expose the rubber. Wrapped V with rubber exposed in Figure 6
A sectional view of the belt 2 is shown.

The fifth step is the wrapped V-belt 2 in which the cover cloth 2d on the back side is peeled off and the rubber is exposed in the previous step.
Is a step of integrally vulcanizing and forming the mountain-shaped projection pieces 3 on the back surface of the mountain at a predetermined pitch to manufacture the mountainous V-belt 1 shown in FIG. 7.

The essential part of the present invention is the first step, that is, FIG.
This is because the work to wind the unvulcanized rubber sheet 2a at the time of making the unvulcanized belt sleeve 2'in Fig. 3 was newly added to the work to wind the release tape 4.

This additional work is completely the same work and can be easily incorporated into the conventional process. When the method of the present invention is used for the ease of incorporation and the back side, the peeling work of the cover canvas 2d on the back side becomes much easier, and the smoothness of the peeling surface is remarkably stable. .

In the second step, that is, in the step of forming an annular unvulcanized belt molding 2'having a trapezoidal cross section in FIG. 4, a method in which the cover canvas 2d located on the back side is not adhered from the beginning can be considered. In this method, both end portions of the cover canvas 2d must be positioned at the corners of the trapezoidal cross section, and precision is required for this positioning, so the covering device becomes a complicated machine and there are many problems in practical application.

[0029]

EXAMPLE A rubber elastomer made of chloroprene rubber, natural rubber, nitrile rubber, butyl rubber, butadiene rubber or the like is used for the stretch rubber layer 2a and the compression rubber layer 2c of the wrapped V belt 2 according to the present invention, and its core wire A high-strength, low-elongation rope made of polyester fiber, polyamide fiber, or aromatic polyamide fiber is used for 2b.

The cover canvas 2d of the wrapped V-belt 2
For the cover cloth 2d, rubber woven or rubber-coated cover cloth 2d is used, which is a woven cloth with excellent abrasion resistance, which is made of nylon fiber, polyester fiber, aramid fiber, inorganic fiber or the like, which has excellent abrasion resistance, alone or mixed. To be done.

Further, for the mountain-shaped projection piece 3 joined to the back surface of the wrapped V-belt 2, a rubber elastomer made of natural rubber, styrene-butadiene rubber, chloroprene rubber, hydrogenated-nitrile rubber or the like is used.

Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 5, the core wire 2 of the wrapped V-belt 2 of the embodiment is shown.
b is polyester core wire, compressed rubber layer 2c and stretched rubber layer 2a are made of chloroprene rubber, cover canvas 2d is made of rubberized cotton canvas, and mountain projections 3 are made of blended rubber of natural rubber and styrene-butadiene rubber. did.

The wrapped V-belt 2 is an A-shaped 34-inch (circumferential length 864 mm) wrapped V-belt, and the mountain-shaped protrusions 3 have an oblique length of 80 mm and an inclination angle of 60 degrees.
An upper width of 8 mm, a lower width of 12.4 mm, and a joint length of 21 mm were used, the mounting pitch was 86 mm, and the total number of the mountain-shaped projection pieces 3 attached to one belt was 10.

A polypropylene resin tape (trade name: Carton tape 640, manufactured by Nichiban Co., Ltd.) having a thickness of 0.07 mm and a width of 50 mm is used as the release tape 4 which is the main part of the present invention, and the pitch is 40 to 45 mm. It was wrapped in a spiral shape.

The right and left corners of the back surface of the wrapped V-belt 2 manufactured under the above conditions are separated by 62.5 from the back surface.
The cover canvas 2d was cut over the entire circumference in the longitudinal direction using a disc-shaped cutter blade at an angle of degrees.

As a result, the peeling work at the interface between the release tape 4 and the stretched rubber layer 2a becomes extremely easy, and the operator can easily carry out the peeling work with a slight peeling force exceeding the adhesive force that the carton tape 640 normally has. I was able to peel it off.

At the same time, by using this method, there is no variation in the peeling surface due to the operator, the working method, etc. As a result, a smooth peeling surface can be stably obtained.

Further, a two-axis stand traveling test (driving pulley 70
mm, driven pulley 70 mm, rotation speed 1200 RPM, belt tension 38 kgf), a comparison test with a comparative example by the conventional method was performed, and as a result, the time until peeling of the mountain-shaped projection piece 3 was 450 hours or more, and its durability performance There was no difference in

The release tape 4 is not limited to the carton tape 640, and cellophane tape, kraft paper, polyester tape or the like can be used as appropriate.

[0040]

As described above, the invention of claim 1 has an effect that the stretched rubber layer can be exposed to the back surface of the wrapped V-belt very easily, and a smooth stripping surface can be obtained. There is an excellent effect of stabilizing the subsequent fifth step, that is, the step of joining the mountain-shaped projection pieces and the stripped surface.

The invention of claim 2 has an effect that a release tape which is inexpensive and very easy to obtain can be used.

The invention according to claim 3 has the effect of facilitating the sticking work of the release tape and the peeling work during the peeling work, and molding an unvulcanized belt molding. In doing so, there is an extremely beneficial effect that the release tape is not easily removed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a V-belt drive device according to the present invention.

FIG. 2 is a perspective view of a V-belt with a mountain according to the present invention.

FIG. 3 is a cross-sectional view showing an unvulcanized belt sleeve according to an embodiment.

FIG. 4 is a cross-sectional view showing a V-belt according to an embodiment.

FIG. 5 is a cross-sectional view showing a state in which a corner of the V-belt according to the embodiment is cut.

FIG. 6 is a cross-sectional view showing a state in which the cover canvas is peeled off from the V belt according to the example.

FIG. 7 is a cross-sectional view showing a state in which mountain-shaped projection pieces are formed on the V-belt according to the example.

FIG. 8 is a cross-sectional view showing an unvulcanized belt sleeve according to a conventional example.

FIG. 9 is a cross-sectional view showing a V-belt according to a conventional example.

FIG. 10 is a cross-sectional view showing a state in which a corner of a V belt according to a conventional example is cut.

[Explanation of symbols]

1 mountain V belt 2 wrapped V belt 2'Unvulcanized belt sleeve 2a Stretched rubber layer 2b cable rope 2c Compressed rubber layer 2d cover canvas 3 mountain-shaped projection pieces 4 Release tape

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29D 29/10 B65G 15/42

Claims (3)

(57) [Claims] 1. A method for manufacturing a V-belt with a mountain having a mountain-shaped projection piece on the back surface of a wrapped V-belt, wherein an unvulcanized rubber sheet is wound around an outer peripheral surface of a cylindrical molding drum, and a cord rope is provided thereon. The first step of winding in a spiral shape, further winding an unvulcanized rubber sheet on it, and finally laminating a release tape on the outer periphery thereof to form an unvulcanized belt sleeve; Wrap the rubber covered canvas around the outer periphery of the unvulcanized belt molded body with a predetermined cross section cut from the belt sleeve,
A second step of forming an unvulcanized belt molded body with a full-circle cover canvas, and a third step of heating and pressing the unvulcanized belt molded body with a full-circle cover canvas to obtain a vulcanized wrapped V-belt. And, on the back surface of the vulcanized wrapped V-belt, the left and right corners on the side where the release tape is embedded are cut at a predetermined angle by at least the thickness of the cover canvas, and the cover canvas is released from the release tape. A fourth step of forming a V-belt that is peeled off together with the rubber to expose the back surface of the V-belt, and a fifth step of integrally vulcanizing and molding the mountain-shaped projection pieces at a predetermined pitch on the back surface of the V-belt of which the rubber is exposed A method for manufacturing a V-belt with a mountain, comprising: 2. The method for producing a V-belt with a ridge according to claim 1, wherein the release tape comprises a resin tape made of polypropylene or polyester, a cellophane tape and a paper tape. 3. The method for producing a V-belt with peaks according to claim 1, wherein the release tape is spirally wound around an unvulcanized rubber sheet.