Thermoforming machine with variable mold closed cycle

Details Thermoforming machine with variable mold closed cycle Thermoforming machine with variable mold closed cycle

1978-05-10

1979-06-19

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Mold opening and closing means and segmented female mold

Rotary cam

425394, 425398, 4254512, 425589, 425590, 425592, 425593, 425161, B29C 1700, B30B 126

Patent

active

041585399

ABSTRACT:
A thermoforming machine having opposed mold platens includes a linkage system driven in cyclic movement by a single rotary cam to cyclically shift the platens between their open and closed position. The cam is driven by a variable speed motor which is controlled in a manner such that the rotary speed of the cam during different portions of a cam revolution may be set to a speed which is different than the rotary speed of the cam 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 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. The platens are mounted for reciprocatory movement upon a three-post frame.

REFERENCES:
patent: 3166790 (1965-01-01), Keyes
patent: 3268952 (1966-08-01), Shelby
patent: 3292214 (1966-12-01), Battenfeld et al.
patent: 3329995 (1967-07-01), O'Brien et al.
patent: 3518334 (1970-06-01), Carrigan et al.
patent: 3621532 (1971-11-01), Dahlberg
patent: 3677675 (1972-07-01), Brown
patent: 3706337 (1972-12-01), Picker
patent: 3719445 (1973-03-01), Sivdelar
patent: 3752622 (1973-08-01), Viodana
patent: 3773446 (1973-11-01), Borrini
patent: 3830614 (1974-08-01), Kurtz

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