JPH07190150A - Toothed belt - Google Patents

Abstract

PURPOSE:To keep the rubber of a tooth part from being exposed from the opening part of canvas so as to prevent the scattering of rubber powder from the surface of a tooth part by forming tooth cloth of canvas with the solid part adhesion quantity of resorcinol-formalin-latex (RFL) liquid adjusted to the specified quantity. CONSTITUTION:Canvas is dipped in RFL liquid, and after being subjected to dip treatment by a pair of rolls and dried, the canvas is further subjected to the same treatment so that the solid part adhesion quantity of the RFL liquid stuck to the canvas is adjusted to 30-50wt.%. When the solid part adhesion quantity of the RFL liquid is less than 30wt.%, the contact part of the warp 7 and woof 6 of the canvas is easily moved to enlarge an opening part 8, and the rubber of a tooth part 2 is sometimes exposed to the surface of the tooth part from the opening part 8 of tooth cloth. When the solid part adhesion quantity of the RFL liquid exceeds 50wt.%, the tooth part shape of the belt does not come out correctly. The opening part of the tooth cloth is thereby kept small and hardly enlarged, and the rubber of the tooth part is not exposed from the surface so as to prevent the scattering of rubber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothed belt, and more particularly to a toothed belt in which the scattering of rubber powder from the tooth surface is eliminated.

[0002]

2. Description of the Related Art As a cloth for a conventional toothed belt made of rubber such as chloroprene and hydrogenated nitrile, 6 nylon or 6.6 nylon in which a weft in the belt longitudinal direction is crimped, and a belt widthwise A non-crimped 6-nylon or 6.6-nylon non-crimped yarn having the same composition is also used for the warp. Then, in order to firmly bond this tooth cloth to the tooth portion of the belt, resorcin-formalin-latex liquid (RF
It was common to coat the rubber by soaking or spreading treatment after adhesion treatment with (L liquid).

However, in this belt, the rubber attached to the surface of the tooth cloth may be scattered due to the abrasion with the pulley, and the scattered rubber powder may adhere to the pulley groove portion of the driving device of the printer to disturb the printing. . That is, when the rubber powder adheres to the pulley groove, backlash occurs between the belt and the pulley, which disturbs the printing. As an improved toothed belt, which is disclosed in, for example, Japanese Utility Model Publication No. 5-33800, there is a canvas which is treated with only the RFL liquid as a tooth cloth and at least the contact surface with the pulley is not rubberized. The belt used is shown.

[0004]

However, if this belt is used for a long time, the opening of the tooth cloth may expand due to the abrasion of the tooth cloth, and the rubber of the tooth section may be exposed from the opening to the surface of the tooth section. It was When this belt is run, the exposed rubber may scatter as rubber powder due to abrasion with the pulley, disturbing the printing of the printer device. The present invention solves such problems, and an object of the present invention is to provide a toothed belt in which rubber powder is prevented from scattering from the tooth surface.

[0005]

That is, the features of the present invention are as follows:
A toothed belt having a plurality of tooth portions arranged along the length direction and a back portion in which a core wire is embedded, and a tooth belt in which a tooth cloth is coated on the surface of the tooth portion, wherein the tooth cloth is resorcin-formalin-
Treated with latex solution only, resorcin-formalin-
A toothed belt in which the amount of the solid content of the latex liquid deposited is adjusted to 30 to 50% by weight, and a toothed belt is provided so that the rubber of the tooth portion is not exposed from the opening of the above-mentioned canvas.

FIG. 1 is a sectional perspective view of a toothed belt according to the present invention. The toothed belt 1 comprises a plurality of tooth portions 2 and a back portion 4 in which a core wire 3 is embedded along the longitudinal direction of the belt. A tooth cloth 5 is attached to the surface of the tooth portion 2.

The raw material rubber used for the tooth portion 2 and the back portion 4 is hydrogenated nitrile rubber, chloroprene rubber, chlorosulfonated polyethylene (CSM), alkylated chlorosulfonated polyethylene (ACSM) and other heat resistant aging. Rubber having improved properties, natural rubber, styrene-butadiene rubber, nitrile rubber, etc. are used. In the above rubber, as a compounding agent, carbon black, zinc white,
Stearic acid, a plasticizer, an antiaging agent, etc. are added, and vulcanizing agents include sulfur and organic peroxides, but these compounding agents and vulcanizing agents are not particularly limited.

The core wire 3 is made by twisting filaments of E glass or high-strength glass having a diameter of 5 to 9 .mu.m and treated with RFL liquid or the like which is a protective agent or an adhesive agent made of a rubber compound. . In addition, as organic fibers, a filament of 0.5 to 2.5 denier of para-aramid fiber (trade name: Kevlar, Technora), which has a small elongation against stress and a large tensile strength, is twisted together to form an RFL solution, an epoxy solution. A twisted cord treated with an adhesive of an isocyanate solution and a rubber compound is used. However, the present invention is not limited to these.

The canvas used as the tooth cloth 5 is 6 nylon, 66 nylon, polyester, aramid fiber or the like, and may be used alone or in a mixture. The warp yarns 7 (belt width direction) and weft yarns 6 (belt length direction) of the tooth cloth 5 are also filament yarns or spun yarns of the above fibers, and the weaving constitution may be any of plain weave, twill weave, and satin weave. In addition, it is preferable to partially use stretchable urethane elastic yarn as the weft yarn.

The tooth cloth 5 is treated only with the RFL liquid, and the solid content of the RFL liquid obtained by drying the RFL liquid is 30 to 50% by weight. R above
The solid content of the FL liquid consists of RF resin and latex solids. This RFL liquid is a mixture of latex with an initial condensate of resorcin and formalin,
The molar ratio of resorcin to formalin is 1 to 1-3. The weight% ratio of the initial condensate of resorcin and formalin and the latex is 1 to 1-10. The latex used here is a latex of styrene-butadiene-vinylpyridine terpolymer, hydrogenated nitrile rubber, chlorosulfonated polyethylene, epichlorohydrin and the like.

As a specific method of treating the above-mentioned tooth cloth 5,
The canvas is dipped in the RFL solution, dip-processed with a pair of rolls at a squeezing pressure of about 0.3 to 0.8 kgf / cm (gauge pressure), and dried, and then the RFL solution is further applied.
The amount of solid content of the RFL liquid adhering to the canvas was adjusted to 30 to 50% by weight. If the solid content of the RFL liquid is less than 30% by weight, the contact portion between the warp yarn 7 and the weft yarn 6 of the canvas becomes easy to move, and the opening 8 expands. 8 may be exposed to the tooth surface. On the other hand, if the solid content deposition amount of the RFL liquid exceeds 50% by weight, the solid content deposition amount increases and the shape of the tooth portion of the belt does not appear accurately.

[0012]

In the toothed belt of the present invention, the tooth cloth is RFL.
It is treated only with the liquid, and the solid content of the RFL liquid is 30 to 5
Since the canvas is adjusted to 0% by weight, the opening of the tooth cloth is small and it is difficult to expand, the rubber of the tooth portion is not exposed from the surface, and the scattering of rubber powder can be prevented. Also,
The solid content of the RFL liquid adhering to the tooth surface reduces the friction coefficient of the surface and reduces noise when the belt is driven.

[0013]

EXAMPLES The present invention will be described in detail below with reference to examples. Example 1 A weaving yarn made of 140 denier 66 nylon warp yarn and 280 denier 66 nylon and 140 denier urethane elastic yarn was used. After weaving,
After the fabric is oscillated in water to shrink it to about 1/2 the width at the time of weaving, the canvas is dipped in the RFL liquid shown in Table 2 and applied to a pair of rolls at 0.5 kgf / cm (gauge pressure). After squeezing, it was dried, and this treated canvas was dipped in the same RFL solution, squeezed with the same squeezing pressure, and then dried to obtain a tooth cloth with a solid content of the RFL solution of 40% by weight. . RFL
The amount of solid content of the liquid adhered was determined by [weight of treated fabric-weight of untreated fabric] / [weight of untreated fabric] × 100 (%).

Next, as a core wire, glass fiber filaments having a wire diameter of about 9 μ are bundled to form a strand, which is dipped in an RFL solution and dried at 250 ° C. for 2 minutes, then 4.0 times / It is a cord composed of about 600 filaments with a twist number of 10 cm. The diameter of this cord is about 0.3 mmφ.

The tooth cloth is finished into an endless cylindrical body, which is set in a mold, and a tension of 0 is set so that a pair of S and Z glass fiber cords are alternately arranged at a pitch of 0.5 mm. Wrap around 9 kg / book and then from above 1
Wrap a rolled sheet made of chloroprene rubber compound, and after vulcanization by the vulcanization method by ordinary press-fitting,
The vulcanization sleeve was cut into a predetermined width to produce individual belts. The resulting belt has a tooth profile of the belt: MXL, the number of teeth: 150, a belt width: 6.4 mm, a tooth pitch: 2.0.
It was 32 mm. The shape of the belt tooth portion after molding was good, and the rubber was not exposed from the opening of the canvas and was not attached to the surface of the belt tooth portion after molding.

[0016]

[Table 1]

[0017]

[Table 2]

Next, the belt was attached to a two-axis running test consisting of a drive pulley (the number of teeth is 18) and a driven pulley (the number of teeth is 90), and the rotational speed of the drive pulley is 9,000 rpm and the driven state at an ambient temperature of 25 ° C. The pulley was driven for 30 hours with a load of 66.2 W and a belt initial tension of 1.0 kg. The presence or absence of rubber powder scattered from the tooth surface of the belt after running for 30 hours was visually inspected. As a result, as shown in Table 3, scattering of rubber powder after running was not confirmed.

Example 2 As a tooth cloth, the same untreated canvas as in Example 1 was dipped in the RFL solution shown in Table 2 and placed on a pair of rolls at 0.5 kgf / cm.
After squeezing with (gauge pressure), it is dried and the same RF
The canvas was soaked in the L liquid, squeezed by a pair of rolls at 0.7 kgf / cm (gauge pressure), and then dried, and a canvas having a solid content adhesion amount of the RFL liquid of 35% by weight was used. With this tooth cloth,
A toothed belt similar to that of Example 1 was produced, and the shape of the belt tooth portion after molding and the presence or absence of rubber powder scattered from the surface of the belt tooth portion after running for 30 hours were examined. As a result, as shown in Table 3, the rubber was not exposed and attached from the opening of the canvas on the surface of the belt tooth portion after molding, and the shape of the belt tooth portion after molding was good, Moreover, scattering of rubber powder after running was not confirmed.

Comparative Example 1 As a tooth cloth, an untreated canvas similar to that of Example 1 was dipped in an RFL solution shown in Table 2 and placed on a pair of rolls at 0.5 kgf / cm.
After squeezing with (gauge pressure), it is dried and the same RF
The canvas was soaked in the L liquid, squeezed by a pair of rolls at 0.3 kgf / cm (gauge pressure), and then dried, and a canvas having a solid content adhesion amount of the RFL liquid of 55% by weight was used. With this tooth cloth,
A toothed belt similar to that of Example 1 was produced, and the shape of the belt tooth portion after molding and the presence or absence of rubber powder scattered from the surface of the belt tooth portion after running for 30 hours were examined. As a result, as shown in Table 3, rubber was not exposed and adhered to the surface of the belt tooth portion after molding from the opening of the canvas, and scattering of rubber powder after running was not confirmed. The shape of the tooth portion of the belt after forming was not accurate, and especially the corners of the tooth tips were rounded.

Comparative Example 2 As the tooth cloth, the same untreated canvas as in Example 1 was dipped in the RFL solution shown in Table 2, treated without applying the squeezing pressure, and dried to deposit the solid content of the RFL solution. Was used as the canvas. Using this tooth cloth, a toothed belt similar to that of Example 1 was produced, and the shape of the belt tooth portion after molding and the presence or absence of rubber powder scattered from the surface of the belt tooth portion after running for 30 hours were examined. As a result, as shown in Table 3, the shape of the belt tooth portion after molding was good, but the surface adhesion rate of rubber was about 10% on the surface of the belt tooth portion after molding, and Scattering of rubber powder was also confirmed.

Comparative Example 3 As a tooth cloth, the same untreated canvas as in Example 1 was dipped in the RFL solution shown in Table 2 and placed on a pair of rolls at 0.5 kgf / cm.
After squeezing with (gauge pressure), it was dried to use a canvas cloth having a solid content of 20% by weight of the RFL liquid. Using this tooth cloth, a toothed belt similar to that of Example 1 was produced, and the shape of the belt tooth portion after molding and the presence or absence of rubber powder scattered from the surface of the belt tooth portion after running for 30 hours were examined. As a result, as shown in Table 3, the shape of the belt tooth portion after molding was good,
The surface adhesion rate of rubber is about 2 on the tooth surface of the belt after molding.
It was 0%, and scattering of rubber powder after running was also confirmed.
The surface adhesion rate of the rubber is a value obtained by dividing the surface area of the rubber exposed from the opening of the canvas by the total surface area.

[0023]

[Table 3]

From these results, it was found that the shape of the belt tooth portion after molding was good only when the canvas in which the solid content of the RFL liquid on the belt tooth cloth was 40% by weight and 35% by weight was used. No rubber was exposed from the opening of the canvas on the tooth surface of the belt, and no rubber powder was scattered from the tooth surface of the belt after running. But RF
When the amount of solid content of the L liquid is outside the range of 30 to 50% by weight, rubber adheres to the tooth surface of the belt, and rubber powder scattered from the tooth surface of the belt after running is confirmed.
It was found that when the amount of the solid content of the L liquid increased, the rubber powder did not scatter from the tooth surface of the belt after running, but an accurate belt tooth profile was not formed.

[0025]

As described above, according to the present invention, the tooth cloth is RFL.
It is treated only with the liquid, and the solid content of the RFL liquid is 30 to 5
Since the weight of the canvas is adjusted to 0% by weight, the opening of the tooth cloth is small, and the contact portion between the warp and the weft becomes difficult to move, so the opening of the tooth cloth does not expand. It is difficult to expose and prevents rubber powder from scattering, and moreover, it is possible to form an accurate belt tooth profile. Furthermore, RF attached to the tooth surface
There is also an effect that the solid content of the L liquid lowers the friction coefficient on the surface and reduces the noise when the belt is driven.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view of a toothed belt according to the present invention.

[Explanation of symbols]

 1 Toothed belt 2 Tooth part 3 Core wire 4 Back part 5 Tooth cloth 6 Weft thread 7 Warp thread 8 Opening part

Claims (1)

[Claims] 1. A toothed belt having a plurality of tooth portions arranged along a length direction and a back portion in which a core wire is embedded, and a tooth belt in which a tooth cloth is coated on a surface of the tooth portion, wherein the tooth cloth is Treated only with resorcin-formalin-latex solution to give solid amount of resorcin-formalin-latex solution of 30-
A toothed belt which is a cloth adjusted to 50% by weight, wherein the rubber of the teeth is not exposed from the opening of the cloth.