Wheelwright machines – Grooving – slitting and/or lacerating of rubber tires
Patent
1990-03-26
1992-09-08
Meislin, D. S.
Wheelwright machines
Grooving, slitting and/or lacerating of rubber tires
B29D 3068
Patent
active
051449960
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a tire grooving apparatus and method wherein lateral runout and center deviation or only the center deviation are detected and thereby the cutting position of a cutter can be corrected.
2. Background Art
Conventionally, the work of grooving a tire for trial manufacturing and a limited scale production, namely carving the tread pattern grooves in a plain cured tire without any tread pattern is generally performed by means of a hand cutter and it requires skills and a lot of time.
Taking the above-mentioned problems into consideration, the present applicant already proposed a tire grooving apparatus, as shown in FIG. 32, having, as main constructive features, a cutting device attached to a vertically movable carriage, which is moved in parallel and perpendicular directions against the tire support shaft; a pivotable arm support shaft which is extended from the carriage; a pivotable arm attached to the support shaft; a cutter holder which is pivotably attached to the pivotable arm perpendicularly to the axis thereof; a cutter which is held by the end portion of the cutter holder; and the cutting position of the cutter arranged to be on the extended axis of the support shaft (Japanese Unexamined Patent Publication No. 54240/1988 and 177232/1986).
In the present specification, the cutting position of cutter means a peculiar point of cutter which is a certain distance (M) (including zero) from the bottom end of the cutter holder (refer to FIG. 1).
Carving of tread pattern grooves for plain tire by the tire grooving apparatus is carried out by setting the cutting position of the cutter to the tangential line (Processing Standard Point for Tread) of plain tire. Thus, since the cutting position of the cutter is kept always on the extended axis of the pivotable arm support shaft, namely on the tangential line of plain tire, calculation of quantity of movement of the movable carriage and the pivotable arm becomes simple, the programming of computer programs becomes easy and accurate grooving becomes possible.
However, when lateral runout in the tire-width direction caused by strain of tire itself or deviation of tire support occurs, even if grooving is carried out by the cutter of which movement is controlled by a computer program so as to carve the prescribed tread pattern while the tire is rotated, position of grooves from the tread center of tires of the same size and specification differs to each tire and positions of grooves which ought to be at the prescribed ones on right and left sides of the tread center C (the tire equator) are different from each groove when a plurality of grooves are carved for a tire, so that there arise problems about quality such as unstableness of tire quality and decrease of strength.
To dispose the problems, the present applicant has provided a tire grooving apparatus and method, wherein the lateral runout of the tire is detected and the cutting position of the cutter is corrected in accordance with detected value.
However, even if the same kind of tires are attached to the tire supporting shaft of the tire grooving apparatus in the same way, the tread center position does not always coinside with the theoretical tread center position set by the standard program for each tire and the slight deviation sometimes occurs because of the difference in dimensions on the right and left sides of the tire arisen during curing, deformation caused by inner pressure, the improper engagement with a rim and the like.
Accordingly, as shown in FIG. 19, the quantity y of lateral runout on the side of the tire is not always equal to the quantity of actual deviation of tread center TC to the tread center PC set by the standard program. Therefore, even if the lateral runout on the side of the tire is detected and the position of cutter is corrected with the detected value (the cutter is moved to follow the lateral runout) and thereby the grooving is performed, the position to be cut cannot be set to a prescribed distance from the tread cen
REFERENCES:
patent: 3835591 (1974-09-01), Cimprich
patent: 4095374 (1978-06-01), Ugo
patent: 4206798 (1980-06-01), Ray et al.
patent: 4311182 (1982-01-01), Clayton
patent: 4663889 (1987-05-01), Strand et al.
patent: 4674380 (1987-06-01), Hecht et al.
patent: 4782881 (1988-11-01), Brinkley et al.
patent: 4817697 (1989-04-01), Takami et al.
patent: 5005628 (1991-04-01), Kinuhata et al.
Kinuhata Satoru
Yamada Seiki
Meislin D. S.
Sumitomo Rubber Industries Ltd.
LandOfFree
Tire grooving apparatus and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tire grooving apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tire grooving apparatus and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-128630