JP4147520B2 - Toothed endless belt manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a toothed endless belt.
[0002]
[Prior art]
A toothed endless belt having belt teeth on both sides is manufactured through the following steps (1) to (9), for example.
(1). A cylindrical mold having a belt tooth forming groove on the outer peripheral surface is covered with a cylindrical first canvas jacket having elasticity in the circumferential direction, and a first rubber layer is wound around the outer periphery of the first canvas jacket.
(2). The first canvas jacket and the first rubber layer provided on the outer periphery of the cylindrical mold are heated and pressed for a short time to pre-form belt teeth.
(3). A core is wound around the outer periphery of the first rubber layer, and the second rubber layer is wound to form a cylindrical body.
(4). The cylindrical body is removed from the cylindrical mold, and a second canvas jacket is placed on the outer periphery of the removed cylindrical body.
(5). A cylindrical body composed of the first canvas jacket, the first rubber layer, the core wire, the second rubber layer, and the second canvas jacket is bridged between a pair of pulleys (see FIG. 5).
In FIG. 5, reference numeral 90 denotes a cylindrical body, and reference numeral 91 denotes a pulley.
(6). A cylindrical body spanned between a pair of pulleys is heated and pressed by a pair of toothed press dies disposed between the pulleys to vulcanize the first and second rubber layers, and belts are provided on both sides thereof. Forming teeth. (See Figure 5)
Note that reference numerals 92 and 93 in FIG. 5 denote toothed press dies.
(7). The pulley is rotated to heat and press the next area of the cylindrical body with a pair of toothed press dies to vulcanize the first and second rubber plates, and belt teeth are formed on both sides thereof.
(8). By repeating the above operation (7), belt teeth are formed on both sides of the entire circumference of the cylindrical body.
(9). When a cylindrical body having belt teeth on both sides of the entire circumference is removed from the pulley and cut with a predetermined width, a toothed endless belt having belt teeth on both sides is completed.
[0003]
However, the above manufacturing method has a problem that it requires a lot of time and a small-diameter endless belt with belt teeth on both sides cannot be manufactured.
[0004]
The reason why the former problem exists is mainly because a method of forming belt teeth little by little on the cylindrical body 90 by using a pair of toothed press dies 92 and 93 while shifting the cylindrical body 90 little by little. .
[0005]
The reason for the latter problem is that the cylindrical body 90 has at least a length for bridging between the pair of pulleys 91 and 91 and a press die 92 and 93 disposed in the air space between the pulleys 91 and 91. It is because the length for this is needed.
[0006]
Note that the above manufacturing method has the same problem even when a toothed belt having a belt tooth on one surface and a ridge on the other surface is manufactured.
[0007]
[Problems to be solved by the invention]
Accordingly, in the present invention, a toothed endless belt can be manufactured in which a small-diameter endless belt with teeth can be manufactured, and a toothed endless belt having belt teeth on the inner surface and ridges (belt teeth) on the outer surface can be manufactured in a short time. It is an object to provide a method.
[0008]
[Means for Solving the Problems]
(Invention of Claim 1)
According to the manufacturing method of a toothed endless belt of the present invention, a cylindrical mold having a belt tooth forming groove on an outer peripheral surface is covered with a first canvas jacket having elasticity in the circumferential direction, and a core wire and a rubber layer are provided thereon. In the manner of winding in this order, and inserting a cylindrical mold having a first canvas jacket, a rubber layer and a core wire into a cylindrical back rubber having a groove for forming a ridge on the inner surface. The process of assembling the mold and storing it in the vulcanizing can, and heating the cylindrical mold and heating and pressing the back rubber from the outside to cause the rubber layer to flow while flowing into the belt tooth forming groove and the ridge forming groove And a step of sulfurating.
(Invention of Claim 2)
The manufacturing method of a toothed endless belt according to the present invention includes a step of covering a cylindrical mold having a belt tooth forming groove on an outer peripheral surface thereof with a first canvas jacket having elasticity in the circumferential direction, and the first canvas jacket. A step of winding in the order of the core wire and the rubber layer, a step of covering the rubber layer with a second canvas jacket having elasticity in the circumferential direction, and a back rubber having a groove for forming a ridge on the inner surface, 1. A process of assembling a mold in a manner in which a cylindrical mold fitted with a second canvas jacket, a rubber layer, and a core wire is inserted and storing the mold in a vulcanizing can; heating the cylindrical mold; And a step of vulcanizing the rubber layer while flowing into the belt tooth forming groove and the ridge forming groove by applying heat and pressure from the outside.
(Invention of Claim 3)
The manufacturing method of a toothed endless belt according to the present invention relates to the invention according to claim 1 or 2, wherein the ridge forming groove is a belt tooth forming groove.
(Invention of Claim 4)
The manufacturing method of a toothed endless belt according to the present invention relates to the invention according to claim 1, wherein the belt slab formed by vulcanizing and integrating the first canvas jacket, the rubber layer, and the core wire is separated from the cylindrical mold and the back rubber. After forming, the belt slab is cut to a predetermined width.
(Invention of Claim 5)
The manufacturing method of a toothed endless belt according to the present invention relates to the invention according to claim 2, wherein the belt slab formed by vulcanizing and integrating the first and second canvas jackets, the rubber layer, and the core wire is formed into a cylindrical mold and a back. After releasing from the rubber, the method includes a step of cutting the belt slab into a predetermined width.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings shown as embodiments.
Embodiment 1
FIG. 1 is a partial perspective view of a double-sided toothed endless belt B manufactured by the manufacturing method of a toothed endless belt according to the present invention. FIG. It is a cross section which shows the state inserted.
(Regarding the structure of the endless belt B with double-sided teeth)
As shown in FIG. 1, the double-sided toothed endless belt B includes a rubber layer 3A having a tooth part 30 and a tooth bottom part 31, a rubber layer 3B having a tooth part 32 and a tooth bottom part 33, and the rubber layer 3A and the rubber layer. The core 2 is provided between 3B, the canvas 1A covering the surface of the rubber layer 3A, and the canvas 4A covering the surface of the rubber layer 3B.
[0010]
The rubber layer 3A and the rubber layer 3B described above are formed from a rubber layer 3 described later made of chloroprene rubber, nitrile rubber, hydrogenated nitrile rubber, millable urethane rubber, ethylene propylene rubber, or the like.
(About the manufacturing method of the endless belt B with double-sided teeth)
Here, the double-sided toothless endless belt B described above is manufactured by the following steps (1) to (4).
(1). As shown in FIG. 2, the cylindrical mold 6 having a belt tooth forming groove 60 on the outer peripheral surface is provided with a cylindrical first canvas having elasticity in the circumferential direction. The jacket 1 is covered, and then the core 2 and the rubber layer 3 are wound on the first canvas jacket 1 in this order, and then the second canvas jacket 4 having elasticity in the circumferential direction is covered.
(2). Assembling process of the cylindrical mold 6 into the vulcanization can The cylindrical mold 6 provided in the vulcanization can and equipped with the first and second canvas jackets 1, 4, the rubber layer 3 and the core wire 2 is attached. The mold is inserted and assembled into a vulcanizing can (see FIG. 2).
[0011]
Here, the back rubber 5 is formed as follows using, for example, a cylindrical mold 7 having a projection 70 for forming the belt tooth forming groove 50.
[0012]
First, a release agent is applied to the outer peripheral surface of the cylindrical mold 7, and an unvulcanized back rubber (for example, made of ethylene propylene rubber) is wound, so that the cylindrical mold 7 is converted into a normal double-sided flat back rubber. The mold is assembled and accommodated in the vulcanizing can in the manner of insertion. Next, the cylindrical mold 7 is heated from the inside by steam of a predetermined pressure, and the back rubber is heated from the outer peripheral side to vulcanize the unvulcanized back rubber. In this state, a belt tooth forming groove 50 is formed in a portion corresponding to the protrusion 70 of the cylindrical mold 7 in the vulcanized back rubber. This is one mode for manufacturing the back rubber 5 having the belt tooth forming grooves 50 on the inner surface, and is not limited to this manufacturing method.
[0013]
The back 5 can be used more than ten times.
"What is Back Rubber"
In the vulcanizing can, the cylinder diameter is reduced by steam pressure (heating / pressurization) from the outside, and this causes the rubber layer of the belt slab forming member sheathed on the cylindrical mold 6 to flow and be added. And molding the outer peripheral surface of the belt slab.
(3). In the vulcanizing can, the cylindrical mold 6 is heated and pressurized from the inside by steam at a predetermined pressure, and the back rubber 5 is heated and pressurized from the outer peripheral side, so that the rubber layer 3 and the cylindrical mold 6 and It flows in the belt tooth forming grooves 50 and 60 of the back rubber 5 and vulcanizes.
[0014]
When the vulcanization is completed, the belt slab BS shown in FIG. 4 in which the first and second canvas jackets 1 and 4, the rubber layer 3, and the core wire 2 are integrated is formed.
[0015]
In this vulcanization step, the cylindrical mold 6 is not deformed, so the cylindrical mold 6 may be at least heated.
(4). Cutting Step When the belt slab BS is released from the cylindrical mold 6 and the back rubber 5 and cut into a predetermined width, the double-sided endless belt B shown in FIG. 1 is completed.
[0016]
In the double-sided endless belt B, the canvases 1A and 1B are formed by the first canvas jackets 1 and 4, and the rubber layers 3A and 3B are formed by the rubber layer 3, respectively.
(About the excellent manufacturing method of this double-sided toothed endless belt B)
As described above, since this manufacturing method can manufacture the double-sided toothed endless belt B by a single vulcanization molding in the vulcanizing can as with the single-sided toothed endless belt B, as described in the section of the prior art. The manufacturing time can be greatly shortened as compared with a case in which belt teeth are formed little by little using a press mold with teeth.
[0017]
In addition, in this manufacturing method, by making the back rubber 5 and the cylindrical mold 6 small in diameter, it is possible to manufacture a double-sided toothed endless belt B having a considerably smaller diameter than that described in the column of the prior art. It is.
(Other)
In the above manufacturing method, the belt tooth forming groove 50 and the belt tooth forming groove 60 are set to “for immediate teeth” or “for lotus teeth”, so that the endless belt has immediate teeth on both sides, and the teeth on both sides. It is possible to produce an endless belt having an endless belt having teeth on one side and teeth on the other side.
[0018]
The back rubber 5 used in the manufacturing method of the above embodiment has a belt tooth forming groove 50 on the inner surface in order to form belt teeth on the outer surface of the belt slab, but forms a ridge on the outer surface of the belt slab. In this case, it is only necessary that the inner surface of the back rubber 5 has a ridge forming groove instead of the belt tooth forming groove 50. When manufacturing such a back rubber, an unvulcanized back rubber is wound around a cylindrical mold (inner mold) used for manufacturing a single-sided endless belt, and the cylindrical mold is attached to a normal double-sided rubber. After the mold is assembled and accommodated in a vulcanizing can in a manner to be inserted into a flat back rubber, the cylindrical mold is heated and the back rubber is heated and pressurized from the outer periphery to vulcanize the unvulcanized back rubber.
[0019]
Instead of using the second canvas jacket, the outer surface of the belt having belt teeth or ridges may be formed of a rubber material instead of the manufacturing method of the above embodiment.
[0020]
【The invention's effect】
Since the present invention is configured as described above, it has the following effects.
[0021]
As is clear from the contents of the embodiments of the invention, a small-diameter endless belt with teeth can be manufactured, and a toothed endless belt having belt teeth on the inner surface and ridges (belt teeth) on the outer surface is short-time. It was possible to provide a method for manufacturing a toothed endless belt that can be manufactured by
[Brief description of the drawings]
FIG. 1 is a partial perspective view of a double-sided toothless endless belt manufactured by a manufacturing method according to Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view showing a method for manufacturing a double-sided toothed endless belt according to Embodiment 1 of the present invention.
FIG. 3 is a cross-sectional view showing a method for producing a back rubber used in the method for producing the double-sided toothless endless belt.
FIG. 4 is a cross-sectional view showing a state in which a belt slab is formed by a back rubber and a cylindrical mold in a vulcanizing can in the method for manufacturing an endless belt with double-sided teeth.
FIG. 5 is a front view showing a toothing process of a conventional method for producing a double-sided toothless endless belt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st canvas jacket 2 Core wire 3 Rubber layer 4 2nd canvas jacket 5 Back rubber 6 Cylindrical metal mold
50 Belt tooth groove
60 Belt tooth forming groove

Claims (5)

A cylindrical mold having a belt tooth forming groove on the outer peripheral surface is covered with a first canvas jacket having elasticity in the circumferential direction, and the core wire and the rubber layer are wound in this order, and the inner surface is convex. Assembling the mold in a manner in which the cylindrical mold having the first canvas jacket, the rubber layer and the core wire is inserted into the cylindrical back rubber having the groove for forming the stripe, and storing the mold in the vulcanization can; And a step of heating the cylindrical mold and heating and pressurizing the back rubber from the outside to vulcanize the rubber layer while flowing into the belt tooth forming groove and the ridge forming groove. A method for manufacturing a toothed endless belt. A step of covering a cylindrical mold having a groove for forming belt teeth on the outer peripheral surface with a first canvas jacket having elasticity in the circumferential direction, and a step of winding the first canvas jacket in the order of a core wire and a rubber layer And a step of covering the rubber layer with a second canvas jacket having elasticity in the circumferential direction, and a back rubber having a ridge forming groove on the inner surface, the first and second canvas jackets, the rubber layer and the core wire The process of assembling the mold and inserting it into a vulcanizing can in a mode in which a cylindrical mold with a rubber is inserted, and heating the cylindrical mold and heating and pressing the back rubber from the outside to form a belt tooth And a step of vulcanizing while flowing into the groove and the groove for forming the ridges. The method for producing a toothed endless belt according to claim 1, wherein the ridge forming groove is a belt tooth forming groove. A step of separating the belt slab formed by vulcanizing and integrating the first canvas jacket, the rubber layer, and the core wire from the cylindrical mold and the back rubber, and then cutting the belt slab to a predetermined width. The method for manufacturing a toothed endless belt according to claim 1. The first and second canvas jackets, the rubber layer, and the belt slab formed by vulcanizing and integrating the core wires are separated from the cylindrical mold and the back rubber, and then the belt slab is cut into a predetermined width. A method for manufacturing a toothed endless belt according to claim 2.

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