Differential pressure forming machine with variable mold closed

Details Differential pressure forming machine with variable mold closed Differential pressure forming machine with variable mold closed

1980-12-15

1983-03-22

Anderson, Philip E.

Plastic article or earthenware shaping or treating: apparatus

With control means responsive to independently operated timer

264322, 425394, 4254512, 4254514, B29C 1700

Patent

active

043773770

ABSTRACT:
A thermoforming machine having opposed mold platens includes a linkage system driven in cyclic movement by rotary cam mechanism to cyclically shift the platens between their open and closed position. The cam mechanism is driven by a variable speed motor which is controlled in a manner such that the rotary speed of the cam mechanism during different portions of a cam revolution may be set to a speed which is different than the rotary speed of the cam mechanism during other portions of each revolution. By adjusting the speed differential or by adjusting the angular extent of that portion of a revolution of the cam mechanism over which the different speed is maintained the time duration of any chosen portion of the cycle may be adjusted independently of the time duration of other portions of the cycle.

REFERENCES:
patent: 3816052 (1974-06-01), Schopper et al.
patent: 3837782 (1974-09-01), Meissner et al.
patent: 3876361 (1975-04-01), Erwin
patent: 4158539 (1979-06-01), Arends et al.

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