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US 4,741,685 AGranted
Injection drive apparatus
AssigneeFanuc Corporation
InventorsYoshiharu Inaba, Fumio Mitoguchi, Keiji Sakamoto, Masatoyo Sogabe
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AssigneeFanuc Corporation
InventorsYoshiharu Inaba, Fumio Mitoguchi, Keiji Sakamoto, Masatoyo Sogabe
Estimating the term…
In order to obtain an injection drive apparatus which is low-priced, can produce a great output torque, and has a satisfactory acceleration/deceleration characteristic, in an injection-molding machine which performs injection by driving a screw by means of servomotors, one or more ball screws (7), used to drive a screw (2) in the axial direction, are driven by means of a plurality of servomotors (M1, M2), a position detector (P1) for detecting the screw position is provided only for one servomotor (M1), and the servomotors (M1, M2) are provided individually with power amplifiers, which are controlled by means of one control circuit so that the individual servomotors (M1, M2) are controlled in synchronism with one another.
In an injection drive apparatus for injection molding adapted to perform injection by moving a screw in an axial direction by means of ball screw means driven by servomotors, said injection drive apparatus comprising a plurality of servomotors for driving said ball screw means, a position detector attached to one of said plurality of servomotors, and a control unit adapted to deliver a torque command to power amplifiers, said power amplifiers provided individually for said plurality of servomotors, on reception of a signal from said position detector, thereby controlling the drive of the individual servomotors.
Dependencies are inferred from the claim text.