Thermoforming apparatus and method of motion control

Details Thermoforming apparatus and method of motion control Thermoforming apparatus and method of motion control

1978-09-20

1979-10-09

Flint, Jr., J. Howard

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264 405, 264550, 425394, 425398, 425412, 425423, 425 78, 425406, B29C 1703

Patent

active

041706218

ABSTRACT:
A method of controlling the reciprocating motion of a mold-carrying platen in a thermoforming apparatus which includes a driven cam disc operatively connected to the platen to move the platen in each cycle of operation upward from a lower, open position to an upper, closed position, to maintain the platen in the upper position, to move the platen downward from the upper position to the lower position and to maintain the platen in the lower position. The method comprises the step of selectively driving the cam within each cycle of operation with a first rpm for determining a maximum speed for the upward motion of the platen and a minimum dwelling period in the lower position and a second rpm for determining a minimum dwelling period in the upper position and a maximum speed for the downward motion of the platen. The second rpm is set as a function of the properties of the article manufactured by the thermoforming apparatus. The driving step includes the step of switching from one of the rpm's to the other as a function of the angular position of the cam disc.

REFERENCES:
patent: 3496257 (1970-02-01), Brown et al.
patent: 3559243 (1971-02-01), Hermes
patent: 3679803 (1972-07-01), Palencher
patent: 3752622 (1973-08-01), Viadana
patent: 3799727 (1974-03-01), Howard
patent: 3816052 (1974-06-01), Schoppee et al.
patent: 3990822 (1976-11-01), MacMillan
patent: 4057380 (1977-11-01), Hosoe

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