| 摘要 |
An I.S. machine is disclosed which includes a plunger (20) for a blank mold, displaceable from a start or down location to an end or fully up location, and a motor (24) for displacing the plunger. A motor control (30) controls the operation of the motor to displace the plunger, and the speed of displacement can be varied by a constant force generator (32) which changes inputs to the control (30). The actual time when the plunger has been displaced to its end location is determined. A fixed period of time from a datum to the ideal time when the plunger will be displaced to its end location is set and compared with an actual period and a selected input to the control (30) is provided for changing the speed or torque of the plunger to reduce the difference. |
