| 摘要 |
A screw capper includes a capping head which comprises a chuck for holding a cap, a motor for driving the chuck for rotation, a cam mechanism for elevating the chuck, and an air cylinder for imparting a load to the chuck. A load imparted by the air cylinder is controlled by a controller to be zero from the beginning of a screwing and tightening operation until an angle of rotation of the chuck exceeds a specific angle where the load is changed, and is controlled to a higher value upon detection of an angle of rotation of the chuck which exceeds the specific angle in the course of the screwing and tightening operation. The arrangement allows a reliable screwing and tightening to be achieved as compared with the prior art while preventing a damage to threads or the occurrence of a cocked cap.
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