Adjusting drive for insert tighteners of presses

A method of moving an insert tightener for holding a die to the clamping face of a press ram, the press ram having a T-groove therein communicating with the clamp face, comprising extending a longitudinally flexible and unstretchable traction member including a toothed belt in the T-groove, operatively connecting a drive motor to the traction member operatively connecting a tenon block to the traction member for movement of the tenon block along the T-groove with actuation of the drive motor, the tenon block being fixed to the insert tighener, and activating the drive motor for moving the tenon block.

An adjusting device for fastening a die to the clamping face of a press ram having a T-groove communicating with the clamping face, comprising a tenon block mounted for movement in the T-groove, traction means for moving the tenon block along said T-groove including a toothed belt which is flexible and un-stretchable with respect to a longitudinal axis thereof, disposed in and extending along the T-groove, said tenon block being operably connected to said traction means for displacing said tenon block along the T-groove, an insert tightener connected to said tenon block and movable with said tenon block to engaging a die to hold the die against the clamping face, and a drive motor operably connected to said traction means for causing movement of said tenon block along the T-groove for engaging said insert tightener with a die for holding the die against the clamping face, said traction means belt is a toothed belt with a flat cross section, a drive gear being connected to said drive motor for rotation by said drive motor, said toothed belt being engaged around said drive gear, and at least one turnaround mounted at a fixed location with respect to the T-groove for engagement with said toothed belt to guide said toothed belt.