Title:
METHOD OF SWITCHING FROM DWELLING STEP TO METERING/KNEADING STEP
Document Type and Number:
WIPO Patent Application WO/1988/000518
Kind Code:
A1
Abstract:
In an injection molding machine employing a servo motor as a source for driving the injection axle to drive the screw in the axial direction, a method is provided to smoothly shift the dwelling step to the metering/kneading step, in order to prevent the error register in the servo circuit from overflowing and to prevent the injection molding machine from coming into halt. When the dwelling step is finished, the error register is followed up (steps S6 to S8) such that the error quantity stored in the error register of the servo circuit that drives the servo motor for injection axle becomes zero. Then, a torque limit value to be applied to the servo motor is switched from a setpoint value for dwelling to a setpoint value for metering and kneading (step S11). The error register is then followed up again over a predetermined period of time from when the torque limit value is switched (step S13), and the step is shifted to the metering/kneading step (step S14).
Inventors:
KAMIGUCHI MASAO (JP)
UMEMOTO HIROSHI (JP)
UMEMOTO HIROSHI (JP)
Application Number:
PCT/JP1987/000541
Publication Date:
January 28, 1988
Filing Date:
July 24, 1987
Export Citation:
Assignee:
FANUC LTD (JP)
International Classes:
B29C45/57; B29C45/76; B29C45/77; B29C45/50; G05B19/23; (IPC1-7): B29C45/76; B29C45/57; B29C45/50
Foreign References:
| JPS61248719A | 1986-11-06 | |||
| JPS60262616A | 1985-12-26 |
Other References:
See also references of EP 0280734A4
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