Endless belt power transmission systems or components – Friction drive belt – Including fabric web
Patent
1996-09-20
1998-07-07
Crowder, C. D.
Endless belt power transmission systems or components
Friction drive belt
Including fabric web
474253, 474264, 474265, 474266, 474268, 474271, F16G 104
Patent
active
057760268
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a power transmission belt with a top fabric of canvas disposed on a back face of the belt, and a method of manufacturing the same.
One example of a power transmission belt with a top fabric disposed on a belt back face is a V-ribbed belt. The V-ribbed belt is so composed that a top fabric is adhered to a back face of an adhesion rubber in which a tension member is buried, and that a rib rubber is formed which is comprised of a plurality of V-shaped projecting ribs which are arranged on an inner side surface of the adhesion rubber in a direction of the length of the belt (See Japanese Patent Application Laid-open Gazette No. 4-151048). The top fabric of the V-ribbed belt disclosed in this gazette is a bias fabric, which is obtained by cutting a woven fabric at a biased angle of 45 degrees and joining edges of a plurality of resultant cut fabrics so that warps and wefts are each inclined at 45 degrees with respect to the direction of the length of the belt.
Meanwhile, there is also known another top fabric which is obtained by stretching a woven fabric and rubberizing the stretched fabric in such a manner that warps and wefts intersect each other at an obtuse angle which is open toward the direction of the length of the belt. The reason for completing the top fabric as such is to improve the elasticity of the top fabric along the direction of the length of the belt and to enhance the bending property of the power transmission belt. Now, a conventional method of manufacturing such a top fabric will be described with reference to FIG. 14.
A tubular woven fabric a as shown in FIG. 14 (a) is severed spiral at an angle .alpha., as shown in FIG. 14(b). The fabric is developed as shown in FIG. 14(c) and is stretched along its longitudinal direction as shown in FIG. 14(d), so that an intersection angle of warps and wefts becomes an obtuse angle .beta.. The fabric is rubberized as it is such, whereby the warps and the wefts are fixed at that intersection angle. The fabric is then severed along lines L1 which are inclined with respect to the longitudinal direction. As a result, a plurality of fabric pieces b are obtained each with the obtuse angle .beta. open toward the longitudinal direction.
The obtained plurality of fabric pieces b are successively overlapped each other at edges and are sewed together by an overlooking sewing machine, thereby creating a long band-like fabric c as that shown in FIG. 14 (e). The band-like fabric c is cut along lines L2 which extend in the direction of the width, each into a length which is needed to create a top fabric for a power transmission belt. Both edges of the severed fabrics are overlapped each other, and are sewed together at overlapped portions by an overlooking sewing machine as shown in FIG. 14 (f), whereby a tubular fabric d for making the top fabric is obtained.
In the band-like fabric c described above, since the obtuse angle .beta. becomes inclined rather than becoming open in the width direction of the woven fabric when the woven fabric is stretched, joining lines J.sub.1 of the fabric pieces b become inclined at an angle of .gamma. with respect to the width direction. Hence, joining lines J.sub.2 of the resultant tubular fabric d and the joining lines J.sub.1 do not become parallel to each other.
An object of the present invention is to solve the following problems associated with the above-mentioned power transmission belt. lines J.sub.1 and J.sub.2 which are not parallel to each other are visible in the surface of the power transmission belt. respect to the width direction of the belt, where the fabric pieces were sewed together with an overlooking sewing machine, if the power transmission belt is operated for a long time, a sewing thread easily gets worn away and cut because of contact with a pulley which is disposed on the back face side of the belt. In other words, the fact that the joining lines J.sub.1 are inclined means that the sewing thread itself is inclined with respect to the longitudinal direction of the belt. Therefore
REFERENCES:
patent: 4299587 (1981-11-01), Imamura
patent: 4589233 (1986-05-01), Parekh et al.
patent: 5344369 (1994-09-01), Kitahama et al.
patent: 5454761 (1995-10-01), Takahashi et al.
Akashi Takamitsu
Hatai Hirotaka
Tajima Yoshitaka
Tsuruta Sizuaki
Bando Chemical Industries Ltd.
Cole Thomas W.
Crowder C. D.
Ferguson Jr. Gerald J.
Taylor Tina R.
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