Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Mold motion or position control
Patent
1977-09-22
1979-12-11
Spicer, Jr., Robert L.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Mold motion or position control
425 4C, 425372, 425817C, 264 462, B29C 1500, B29D 2700
Patent
active
041781449
ABSTRACT:
In a molding apparatus employing opposed endless belt conveyors to mold a non-rigid material into a rigid material, the problem of one conveyor being driven at a slightly greater speed than the other conveyor to produce harmful shear stresses within the molded product is avoided by driving both conveyors at generally the same speed during start-up until the rigid product extending between the two conveyors will tend to drive the slower conveyor at the speed of the faster conveyor, at which point the drive for the slower conveyor will be disconnected. One-way clutches may be placed in the drive of both conveyors so that it does not matter which conveyor is slower, or a one-way clutch may be placed in the drive of only one conveyor and the other conveyor constructed so that it will inherently tend to run faster than the one conveyor, or a selectively releasable coupling, such as a clutch, may be placed in the drive of one conveyor so that the drive of the one conveyor may be disconnected. Preferably, a synchronous motor is used to drive each of the conveyors from a common power source, so that the synchronous motor associated with the slower conveyor may be deenergized when the slower conveyor drive is uncoupled.
REFERENCES:
patent: 2326889 (1943-08-01), Schulz et al.
patent: 3312760 (1967-04-01), Berner
patent: 3568245 (1971-03-01), Jetzer
patent: 3706516 (1972-12-01), Kisteneich et al.
patent: 3887314 (1975-06-01), Andresen et al.
patent: 3994648 (1976-11-01), Kornylak et al.
Beall, Jr. Thomas E.
Kornylak Corporation
Spicer, Jr. Robert L.
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