| 摘要 |
A workpiece position control apparatus, specifically an apparatus controling the diameter of blown film tube, includes at least one fluid nozzle (14, 15), pressure sensing means (23) for signaling the pressure of a fluid passing through the at least one nozzle and impinging on a workpiece (5) when the workpiece is in a first position and for signalling the pressure of the impinging fluid when the workpiece is in at least one second position, and controlling means (23) for adjusting the position of the workpiece in response to signals from the pressure sensing means. <IMAGE> |
