Driving device for clamping tool arms comprises motor driven screw and nut translated along screw, linear guide locks nut rotation during first displacement phase and helicoidal guide reduces nut translation speed in second phase

摘要

The driving device for the relative displacement of two clamping tool parts (16,18) comprises a screw (10) driven by a motor (M) and a nut (12) which is translated along the screw axis together with a part (14). A linear guide (22L,24L) locks rotation of the nut during a first displacement phase. A second helicoidal guide (22H,24H) with an inverse pitch to that of the screw enables the apparent pitch of the screw to be decreased and thus the nut translation speed in the second displacement phase. An Independent claim is included for a clamping tool fitted with the driving device.