| 摘要 |
PURPOSE: To ensure driving at exact periodic cycles with an effective, durable and accurate mechanism by assembling a rotary cam capable of rotation about a fixed axis line adjacent to a ram and engaging a cam follower with the cam while moving in cooperation with a tubular body. CONSTITUTION: Programmed logic circuit 54 issues a command to a valve 50 to direct compressed air from a compressor 52 to a tube 46. The valve spool is set in position A. The tube 46 directs compressed air to an inlet 42 and the top part of a cylinder 36. This causes the cylinder 36, a plate 28, a tubular body 16 and a cam follower 70 to move upward along a shaft 30 and finally engage a cam follower 66 with a cam face 76. A motor rotates a cam 68 at a constant speed. The surface of the cam 68 vertically moves the cam follower 66, or the plate 28, back and forth. The motion of the plate 28 transmits the reciprocating motion corresponding to the tubular body 16. If an extraordinary condition is observed, then a signal is sent to the logic circuit 54 to stop the oscillation of the tubular body 16. Thus fillings do not occur. |
