Method for controlling proper clamping of a workpiece in a clamping device
AssigneeWilhelm Hegenscheidt Gesellschaft mbH
InventorHeinz vom Dorp
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Abstract
A method for controlling proper clamping of a workpiece in a clamping device, the clamping jaws of which are moved to a clamping position by movement of a piston of hydraulically operated cylinder-and-piston means in a clamping direction, in which a control signal is produced indicating proper clamping of the workpiece when sensing means cooperating with the piston indicate that the latter, during its movement in clamping direction, has reached at least a first position but not reached a second position spaced in clamping direction from the first position, while at the same time a predetermined pressure acting in clamping direction on the piston is indicated.
Claims6
A method for controlling proper clamping of a workpiece in a clamping device having clamping jaws operatively connected to fluid operated cylinder-and-piston means, the piston of which is to be moved in one direction during clamping of the workpiece, comprising the steps of placing a workpiece between the open clamping jaws;
- feeding pressure fluid into said cylinder-and-piston means to move the piston thereof in said one direction;
- sensing whether the piston during movement in said one direction reaches at least one first piston position but not a second piston position spaced in said one direction from said first position;
- simultaneously sensing the presence of a predetermined fluid pressure acting on the piston;
- and producing a control signal indicating proper clamping of the workpiece when the piston in its final clamping position has at least reached said first position but not reached said second position while said predetermined fluid pressure is present in said clamping position.
Dependencies are inferred from the claim text.