JPH0813475B2 - V-belt manufacturing method with long cogs - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a long V-belt with a cog, and more particularly to a method for manufacturing a long low-edge V belt.

(Prior Art) Conventionally, as a method of manufacturing a belt of this type, for example, in a drum system, a mother die with a rubber cog is cut into a predetermined length on the surface of the drum, and is endlessly wound around the surface of the V drum. A method has been adopted in which constituent materials of a belt including a V-core rubber sheet are sequentially wound to form an unvulcanized belt molded body, a cylindrical jacket is fitted on the surface of the unvulcanized belt molded body, and vulcanized in a vulcanizing can.

In addition, recently, a V-belt for general industrial use has been studied, and a demand for a V-belt with a long low-edge cog having good flexibility has been increasing. However, in the drum system described above, the size of the vulcanization can is naturally caused. There was a limit.

Therefore, as disclosed in, for example, U.S. Pat. No. 4,332,576, it is possible to use as a molding vulcanization of a long V belt.
A method is known in which unvulcanized belt sleeves hung on two drums are sequentially molded and vulcanized using a mold with cogs.

Further, as another method, in JP-A-60-129219,
When the unvulcanized belt sleeve is sequentially molded and vulcanized using a cog-molded mold, and the final unvulcanized part of the belt molded body is molded and vulcanized into a cog shape, the cog-shaped molds installed near both ends of the cog-molded mold. It is disclosed that an already formed cog portion is fitted into the groove portion of the alignment jig to form an accurate cog pitch.

(Problems to be solved by the invention) However, by partially vulcanizing the conventional belt sleeve,
The method of vulcanizing the entire length while repeating this in sequence has the following problems.

That is, the belt length is not always divisible by the cog pitch of the mold, and if the cog parts of the initial vulcanization zone and the final vulcanization zone of the belt sleeve are continuously molded, the probability of generation of cog fractions was high. If the unvulcanized belt sleeve with this cog fraction is subjected to mold addition vulcanization with a mold with cogs, the belt cog part does not match the cog part of the mold at the time of final vulcanization, and if the mold addition vulcanization work is forced in this state. There was a problem that the cog part of the belt was destroyed.

Further, it has been confirmed that when the cog aligning jig is used at both ends of the mold with cogs, the belt cog portion is likely to coincide with the mold cog portion even if an unvulcanized belt sleeve with a large number of cog edges is used. However, this is also a problem to some extent, and even if a cog aligning jig is used, it is impossible to adjust the pitch difference when the belt cog portion and the mold cog portion are largely displaced in the press.

The present invention solves these problems, and does not require a step of matching the belt cog portion and the mold cog portion at the time of vulcanization molding, and a long cog-equipped V-belt capable of reliably molding the belt cog portion. It aims at providing the manufacturing method of.

(Means for Solving the Problems) That is, the features of the present invention are that an endless elastic mother die having grooves at a constant pitch in the longitudinal direction and at least stretched rubber layers on the upper and lower layers of the belt tensile member. An endless unvulcanized belt sleeve equipped with a compression rubber layer is hung between a pair of pulleys with the groove of the elastic mother die in contact with the compression rubber layer of the belt sleeve. The vulcanized belt sleeve and the elastic mother die are pressed into contact with each other to form and vulcanize the cog part of the compressed rubber layer of the belt sleeve. It is a method for manufacturing a long V-belt with a cog formed by cutting into a single body.

(Operation) That is, in the method for manufacturing a V-belt with a long cog according to the present invention, an elastic mother die having a groove portion and an unvulcanized belt sleeve are provided, and the groove portion of the elastic mother die is a compression rubber layer of the unvulcanized belt sleeve. Are laminated in a state of being in contact with, and are hung between a pair of pulleys. When this laminate was continuously vulcanized by the progressive feeding method, the vulcanized belt sleeve was pressed against the elastic mother die to form the cog portion, and the cog portion of the belt and the mold was not aligned even in the final vulcanization. It is possible to reliably form a cog part with a constant pitch, and even if the number of cog peaks is not divisible by the required length, by adjusting the extension of the elastic mother die, the cog belt of the desired length can be vulcanized. it can.

(Example) First, FIG. 1 is a manufacturing example of an unvulcanized belt sleeve (1) used in the present invention, in which a rubber sleeve (2) is used.
A compressed rubber layer (4) is formed on a cylindrical forming drum (3) coated with
After laminating, a high-strength, low-elongation rope-like tensile body (5) such as polyester fiber is spirally wound, and an extension rubber layer (6) thinner than the compression rubber layer (4) is laminated, and The stretch rubber layer (6) has a canvas having a stretchable surface layer,
For example, the bias canvas (7) having a good stretchability, in which the crossing angle between the warp yarn and the weft yarn is 90 to 155 °, includes one to a plurality of plies, and two plies in the figure.

The compressed rubber layer (4) may be mixed with single fibers arranged in the width direction of the belt, for example, short fibers such as cotton and nylon.

When the endless unvulcanized belt sleeve (1) molded in this way is extracted from the cylindrical molding drum (3), it is transferred to the vulcanization step shown in FIGS. 2 and 3.
In this vulcanization step, the pulleys (9) (9) (9), which are preliminarily stretched between the two pulleys (9) (9) whose axial distances can be adjusted, are laminated on each other. Lamination work of the unvulcanized belt sleeve (1) is performed by reducing the axial distance of 9). When this work is completed, the axial distance between the pulleys (9) and (9) is adjusted to adjust the tension of the elastic matrix to about 0.6 to 1.2 kg / cm.

The elastic matrix (10) used here is an endless type having grooves (11) at a constant pitch in the longitudinal direction of the surface,
Hardness 70-80 ° (JIS standard), 100% modulus 100kg / cm ²
Hereafter, any material may be used as long as it satisfies the physical properties of elongation at break of 200% or more, and is not necessarily limited to rubber, and may be polyurethane.

The laminated state of the unvulcanized belt sleeve (1) and the elastic mother die (10) is such that the groove portion (11) of the elastic mother die is in contact with the unvulcanized belt sleeve (1), and the unvulcanized belt sleeve is also formed. The (1) does not necessarily have to be located above the elastic mother die (10), and the elastic mother die ((1) is placed on the unvulcanized belt sleeve (1) suspended by the two pulleys (9) (9). It is also possible to coat 10) and perform reverse molding. Therefore, the elastic matrix (1
Design so that the outer peripheral length of (0) and the inner peripheral length of the unvulcanized belt sleeve (1) or the elastic mother die (10) and the outer peripheral length of the unvulcanized belt sleeve (1) are substantially the same. Is important. If the inner peripheral length of the unvulcanized belt sleeve (1) becomes 2.0% or more larger than the outer peripheral length of the elastic mother die (10), the unvulcanized belt sleeve (1) will bend at the final stage of vulcanization, and Cogs are not molded.

Even if the number of cog peaks is not divisible by the required length of the belt, the belt of the desired length can be formed by adjusting the extension of the elastic mother die (10).

This unvulcanized belt sleeve (1) is progressively vulcanized, but in the vulcanizer used here, the upper plate (12) is provided on the rear side of the unvulcanized belt sleeve (1) with the elastic mother die (10). ) On the bottom side of the middle plate (13), further unvulcanized belt sleeve (1)
Lower boards (14) are arranged on the downward facing side of the
2), a flat plate-shaped mold (15) (16) is provided on the holding surface of the lower plate (14) and the belt sleeve (1), and another flat plate-shaped mold is provided on the holding surface of the middle plate (13) and the elastic mother die (10). Molds (17)
(18) is equipped. Each mold (15) (16)
(17) Edges (19) to prevent rubber flow during vulcanization are bulged on both left and right sides of (18), and at the front and rear ends of each mold, cooling is performed in the width direction. Equipment (2
0), more specifically, a supply pipe (21) through which a cooling fluid flows is provided, which causes excessive swelling (volume over) and sponge generation at the boundary between the vulcanized portion and the unvulcanized portion of the belt sleeve during vulcanization. The occurrence of outflow of rubber from the belt sleeve is prevented.

The unvulcanized belt sleeve (1) suspended between a pair of pulleys (9) (9) has two parts on the upper side and the lower side.
Mold (17) (18) mounted on 3) and upper and lower panels (12)
It is sandwiched between the molds (15) and (16) attached to (14),
It is vulcanized at a predetermined temperature and pressure. The vulcanization of the unvulcanized belt sleeve (1) proceeds along with the molding of the cog portion and comes into close contact with the elastic matrix (10). In this case, the cooling device (19) provided in each mold prevents the generation of bubbles and the volume over phenomenon at the boundary between the vulcanized portion and the unvulcanized portion of the belt sleeve.

The vulcanized belt sleeve is moved by a certain pitch from the vulcanization area of the mold. In this case, the semi-vulcanized belt sleeve is vulcanized again by the action of the cooling device (21) at the rear of the vulcanized portion. It is left in the area and vulcanized by heating and pressing. While repeating this operation in sequence, the final vulcanization zone of the belt sleeve is left in a semi-vulcanized state and the process proceeds to the final stage. The endless belt sleeve has two upper and lower
Since the vulcanization process is proceeding simultaneously at the points, two unvulcanized zones are left as a result.

Next, the final vulcanization area, which remains unvulcanized, is moved to molding vulcanization. In this step, it is necessary that the belt sleeve (1) and the elastic matrix (10) are in close contact with each other. There
In this state, the belt sleeve is heated and pressed to obtain a laminate of the belt sleeve and the elastic mother die.

When this is completed, each plate of the vulcanizer (12) (13) (1
4) and molds (15) (16) (17) (18) are laminated (2
After moving it away from 2), cool it by pouring cooling water while running the belt sleeve (1). The cooled belt sleeve (1) is removed from the two pulleys (9) (9) and moves to the cutting step, in which case the vulcanized belt sleeve (1) is released from the elastic mother die (10). .

The vulcanized belt sleeve (1) is suspended on two pulleys of a cutting machine or inserted into a mantle, and then cut into a certain width by a cutter while rotating, and a plurality of cross-sections having a square shape, a rectangular shape, a trapezoidal shape, etc. Once separated into belts, these belts are machined. However, in the present invention, if it is possible to cut the belt alone into a trapezoidal cross section, it is not necessary to cut the side wall of the belt. However, as the belt becomes longer, the dimensional error of the belt cross-sectional shape increases, so it is desirable to perform cutting.

In the cutting process, as shown in FIG. 4, the belt (22) is hung on the drive pulley (23) and the driven pulley (24) to run, and the roll (25) is brought into contact with the belt back surface portion (26). The cutting blades (27) (27) and the guide roll (2)
8) At least two (28) are provided in the belt longitudinal direction to engage with the side wall of the belt, and one of the opposing cutting blades (2
In this method, 7) is rotated in the direction opposite to the belt running direction, and the other cutting blade (27) is rotated in the direction following the belt running direction so that both side walls of the belt are cut into V-shapes. As for the belt (22), not only the belt length but also the cross-sectional shape has a small dimensional error, that is, it is possible to process a belt having a small variation.

Therefore, as a result, it is sufficient to simply check the belt for the conventional measuring step, and it is not necessary to check all the belts.

Thus, the belt thus obtained becomes a long cogged V-belt having a cog portion (30) in the compressed rubber layer (4) as shown in FIG.

Further, according to the method of the present invention, as shown in FIG. 6, in the compression rubber layer (4), the V groove (31) is formed at a constant pitch in the width direction of the bettle.
(Two in the drawing), cog parts (30) at a constant pitch in the longitudinal direction of the belt, and integrated by a canvas (tie band) (32) provided on the surface of the stretched rubber layer (6) It is also possible to manufacture a V belt with a long cog.
This belt can be manufactured, for example, by cutting a vulcanized belt sleeve (1) into a wide width, hanging it on two pulleys, and cutting a plurality of V grooves with a cutting blade.

(Effect) As described above, in the method for manufacturing a long V-belt with a cog according to the present invention, the endless elastic mother die having groove portions at a constant pitch in the longitudinal direction and the endless unvulcanized belt sleeve are elastic mother die. It is hung between a pair of pulleys with the groove and the compressed rubber layer of the belt sleeve in contact with each other, and the unvulcanized belt sleeve and elastic mold are heated and pressed to form a cog portion on the belt sleeve and then moved by a fixed pitch. This is a method of continuously vulcanizing and molding by repeating this sequentially, and even in the final vulcanization, it is possible to continuously use the elastic mother die without the work of matching the cog part of the molded belt and the cog part of the mold. It is possible to manufacture a cog belt of the desired length by adjusting the extension of the elastic mother die even when the number of cog peaks is not divisible by the required length. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view showing an example of manufacturing an unvulcanized belt sleeve, FIG. 2 is a side view showing a vulcanizing step of an unvulcanized belt sleeve, and FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is an explanatory view showing a step of cutting a vulcanized belt into a V shape, FIG. 5 is a sectional perspective view of a V belt with a long cog obtained by the method of the present invention, and FIG. It is a cross-sectional perspective view of another V-belt with a long cog obtained by the method of the invention. (1) …… Belt sleeve (4) …… Compressed rubber layer (5) …… Belt tension body (6) …… Expanded rubber layer (9) …… Pulley (10) …… Elastic matrix (11)… … Groove (15) (16) (17) (18) …… Mold (27) …… Cutting blade (30) …… Cog

 ─────────────────────────────────────────────────── --Continued from the front page Examiner Hitoshi Miura (56) References JP-A-60-46220 (JP, A) JP-A-60-129218 (JP, A)

Claims (2)

[Claims] 1. An endless unvulcanized belt comprising an endless elastic mother die having grooves at a constant pitch in the longitudinal direction, and at least an extension rubber layer and a compression rubber layer above and below the belt tensile member. The sleeve is hung between a pair of pulleys with the groove portion of the elastic mother die in contact with the compression rubber layer of the belt sleeve, and the unvulcanized belt sleeve and the elastic mother die are pressed against each other under heating to compress the belt sleeve. A long cog characterized by molding and vulcanizing the cog part on the rubber layer, repeating this in sequence to mold and vulcanize the entire circumference of the belt sleeve, and then cutting the vulcanized belt sleeve into a single belt. Of manufacturing attached V-belt. 2. The cutting of the belt alone is performed by hanging the belt, which is obtained by cutting the belt sleeve, on two pulleys and running the rollers, abutting the rolls on the back surface of the belt, and then at least a pair of opposing belts. The method for producing a long V-belt with cogs according to claim 1, further comprising a process of engaging both side walls of the belt with a cutting blade to cut both side walls of the belt into a V-shape.