Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Tire body building type
Patent
1982-11-22
1984-09-11
Kimlin, Edward C.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Tire body building type
156421, 156495, 156411, 156123, B29H 1710, B29H 1720
Patent
active
044708661
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to rubber sheet bonding apparatus for use in forming a green-rubber tire, for bonding a rubber sheet which is a tire constituent material, on a tire forming drum.
2. Background of Art
Conventionally, in a green-tire forming system, for bonding a rubber sheet which comprises, for example, tread and side-wall sections formed integrally by extrusion, to a carcass layer applied over a forming drum, the rubber sheet is cut in a length corresponding to the circumference of the drum beforehand on a conveyor which is disposed adjacent to the drum, and the cut of the rubber sheet is supplied to the drum by means of a feeding conveyor synchronized with the peripheral speed of the forming drum, so that automatic bonding of the rubber sheet is performed. Such conventional techniques are disclosed in, for example, Japanese Patent Publication No. SHO 43-28604, Japanese Patent Publication No. SHO 53-24463 and Japanese Patent Publication No. SHO 55-36500. In such conventional systems, however, since the rubber sheet is left as it is for a given time after it is cut to a predetermined length, until it is bonded, it contracts so that the size changes. Then an appropriate joint cannot be formed, and problems such as incomplete joints in side-wall sections are generated. Thus it has been difficult to provide reliable automation of bonding of rubber sheets of this kind. A large problem with a sheet of unvulcanized rubber, particularly a rubber sheet in the form of tread and side-wall sections formed integral with each other by extrusion, is that the amount of contraction in the length direction is larger in the side portions that the longitudinal center portion of the sheet. Also, since a conventional system requires a rubber sheet supplying apparatus (such as a feed-out conveyor, for example) which can operate in synchronism with the peripheral speed of the forming drum, a problem arises since its size is very large.
The primary object of this invention is to provide a rubber sheet bonding apparatus for bonding a rubber sheet, which is a material forming a tire over a drum to form a joint, with which the sheet applied or bonded for the most part to the drum can be cut in an exactly desired length to thereby form the joint properly.
The second object of this invention is to minimize the size of rubber sheet bonding apparatus.
DISCLOSURE OF INVENTION
A rubber sheet bonding apparatus according to the present invention comprises: a forming drum of which the amount of rotation is controllable; a main frame movable toward and away from the drum and having a transport and guide portion for supplying a rubber sheet to said drum along the direction of movement thereof; a cutting structure provided on said main frame to traverse said transport and guide portion so as to cut said rubber sheet; a chuck structure provided on said main frame in such a manner as to be movable back and forth along the direction of movement of said main frame, said chuck structure holding a portion of the rubber sheet in the vicinity of its end portion and advancing toward the drum to thereby position the end of the rubber sheet in a predetermined position ahead of the main frame; a pressing structure mounted on said main frame at its front end for pressing against and bonding the front end of said rubber sheet to said drum when the sheet is positioned in said predetermined position by said chuck structure and said main frame is in its advanced position; and a brake structure mounted on said main frame and operating to hold said rubber sheet by its rear portion only during a portion of the entire travel of said chuck structure holding said rubber sheet. Preferably, the rubber sheet bonding apparatus arranged as the above may further comprise a closure structure mounted to face a predetermined position on the surface of said drum, which closure structure includes closure members which abut said rubber sheet wrapped around said drum across its opposing ends and shift so as to make said opposing ends of s
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Nosaka Tsutomu
Satoh Kazuo
Geoffrey, Jr. Eugene E.
Kimlin Edward C.
Sumitomo Rubber Industries Ltd.
Wine F. K.
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