Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1992-08-28
1995-01-31
Knable, Geoffrey L.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156135, 156398, 156415, B29D 3032, B29D 3036
Patent
active
053856201
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a process and an apparatus for building a green tire in a process for producing a radial tire.
Conventional methods have been developed for building a green tire.
Firstly, a tire carcass is wound on a tire shaping former including right and left shoulder formers, and formed into a cylindrical shape. Then, beads are set in specified positions on the tire carcass. In this state, bead locking mechanism provided in the respective shoulder formers are expanded in a radial direction of the shaping former, whereby the beads are locked in the tire carcass. Subsequently, while the shaping air is supplied to inflate the tire carcass, the left and the right shoulder formers are moved closer to each other by a driving mechanism, narrowing the distance between the beads. In this way, the tire carcass is shaped into a toroidal form. Thereafter, opposite side portions of the tire carcass are turned up around the respective beads. Consequently, a breaker and a tread are further applied onto an outer circumferential surface of the tire carcass, whereby a green tire is completely built.
For carrying out the above process, an apparatus is used having a main shaft supported by a housing rotatably and movably in an axial direction thereof, and a countershaft (sleeve) externally fitted to the main shaft and being rotatable together with the main shaft and movable in an axial direction thereof relative to the main shaft. The apparatus also includes left and right shoulder formers fixed to forward ends of the main shaft and the countershaft, each shoulder former being provided with radially expandable bead locking mechanism and inflatable ply turn-up device. A pair of ladder-shaped screw shafts, angular screw shafts, or ball screws, each having a left-handed screw portion and a right-handed screw portion, are rotatably supported by the shoulder formers in parallel to the main shaft. A member provided with holes having internal right-hand screw threads on opposite sides thereof are connected to the screw shafts and the countershaft in the following fashion. The holes of the member are spirally fitted to the right-hand screw portions of the respective screw shafts. A center portion of the member is so connected to a rearward end of the countershaft as to render the countershaft rotatable and slidable. In addition, a member provided with holes having internal left-hand screw threads on opposite sides thereof is connected to the screw shafts and the main shaft in the following fashion. The holes of the member are spirally fitted to the left-hand screw portions of the respective screw shafts. A center portion of the member is so connected to a rearward end of the main shaft as to render the main shaft rotatable and slidable. The screw shafts are coupled to a motor. By reciprocatingly rotating the screw shafts by the motor, the main shaft and the countershaft can be moved in the axial direction thereof relative to each other. Accordingly, the shoulder formers fixed respectively to the main shaft and the countershaft can be moved closer to or away from each other. In other words, in this apparatus, the driving force of a drive source, such as a motor, is transmitted respectively to the main shaft and the countershaft through a desired driving force transmission mechanism, whereby the main shaft and the countershaft are moved closer to and away from each other.
However, in the above process and apparatus, the left and the right shoulder formers are coupled to the driving mechanism through the main shaft or the countershaft respectively. Unless driven by the driving mechanism, the shoulder formers are in almost completely fixed states respectively. Accordingly, the following problems occur.
FIG. 7(a) shows the state of an over hanging carcass ply C mounted on a turn-up bladder (ply turning up bladder) 63. In this state, left and right shoulder formers on which the carcass ply C is wound (only one of the shoulder formers 70 is shown in FIG. 7(a)) are fixed, and therefore the dis
REFERENCES:
patent: 3409491 (1968-11-01), Pacciarini et al.
patent: 3434897 (1969-03-01), Caretta et al.
patent: 3694290 (1972-09-01), Pacciarini et al.
patent: 3867230 (1975-02-01), VanHorn et al.
patent: 4780170 (1988-10-01), Landsness
Kondo Kazuaki
Sato Kazuo
Knable Geoffrey L.
Sumitomo Rubber Industries Ltd.
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