| 摘要 |
<p>A slide is moved up and down by a connecting rod provided at a crankshaft and imparted with long and short strokes by changing over from engagement to disengagement, and vice versa, between an eccentric shaft formed on the crankshaft and an eccentric sheave incorporated with the eccentric shaft. The eccentric sheave is arranged to be downwardly eccentric when the crankshaft is at the bottom dead center, and in this condition, a main cylinder extends through the eccentric shaft, the eccentric sheave and the connecting rod. The main cylinder has a lock pin for connecting the eccentric sheave to the eccentric shaft at its upper limit and to the connecting rod at its lower limit. Movement of the lock pin in the main cylinder causes the eccentric sheave to engage with or disengage from the eccentric shaft. To stop the slide exactly at a predetermined position, provided are a main gearwheel mounted to the crankshaft, knock blocks symmetrically disposed at the periphery of the main gearwheel and air cylinders corresponding to the knock blocks and having piston rods. Adjustment is made to mounting positions of the knock blocks and strokes of the piston rods so as to stop the crankshaft at a predetermined angle when the piston rods of the air cylinders engage with the knock blocks, facilitating the movement of the lock pin.</p> |
