| 摘要 |
PURPOSE:To control to produce and keep a set pressure to press a nozzle against a mold at all times by a method wherein a motor is driven at low speed after a first sensor outputs a detection output and the driving of the motor is stopped upon the receipt of the detection output of a second sensor. CONSTITUTION:When a motor 8 is driven even after the abutting of a nozzle 3 against a mold, a ball nut 10 and a first and a second plates 11 and 12 advance though an extruder base 5 stands still, and consequently, at first, a first sensor S1 detects the first plate and outputs a detection output so as to drive a motor 8 at low speed. On the other hand, springs 13 and 13 are compressed by the second plate 12 and the reactions due to the compression of the springs is transmitted to the extruder base 5 as a force to press the nozzle 3 against the mold. As a result, a second sensor S2 detects the first plate and the detection signal of the second sensor stops the driving of the motor 8. |
