Force detecting controlling device of a screw for an...

Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area

Reexamination Certificate

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Details

C425S140000, C425S594000, C425S595000

Reexamination Certificate

active

07077637

ABSTRACT:
The present invention is a force detecting controlling device for a screw of an injection molding machine, which utilities a load cell as a force sensor for injection, holding pressure and back pressure. The load cell arranged on a rear fixed plate directly detects a force applied onto a ball screw nut. Because the ball screw nut is fastened on the load cell, and the load cell is fixed on the rear fixed plate, the force on a ball screw is directly transmitted to the ball screw nut. Therefore, a total value of the force on the ball screw produced by back pressure and friction among mechanical parts are equal to a force value of the ball screw nut applying onto the load cell. The injection force detected via the load cell for an instant response reaches a close loop control and procedures of holding pressure and back pressure are specifically controlled as well.

REFERENCES:
patent: 3669599 (1972-06-01), Snider et al.
patent: 5421712 (1995-06-01), Laing et al.
patent: 5932155 (1999-08-01), Ingram
patent: 5955117 (1999-09-01), Ito et al.
patent: 2003/0219509 (2003-11-01), Yoshioka

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