Workpiece clamps for coordinate tables of turret punch

Claim 7

A device as claimed in claim 1, including electrical switch means for a drive mechanism for the coordinate table, the clamp being pivoted on the holder and being also capable of movement relative to the holder in a plane parallel to the axis of the pivot so that when the clamp meets with an abnormal or improper resistance to its motion it can pivot on the holder thereby disconnecting one of said electrical switch means.

Claim 8

A workpiece clamp for a coordinate table on a turret punch comprising a clamp holder displaceably attached to a transverse carriage of a coordinate table having a chuck lever adjustably attached, which holds the workpiece in a position for movement between an upper turret table rotatably mounted in the upper part of the machine or in the upper part of an inner tool holder and a lower turret table which is equiaxially mounted in the lower part of the machine or in the lower part of an inner tool holder, wherein workpiece clamps are pivotally arranged so that, on collision with a stationary part they execute an avoiding movement, whereby an electrical conTact located in the region of said avoiding movement is actuated thereby interrupting or disconnecting a drive mechanism.

Claim 9

A workpiece clamp for a coordinate table on a turret punch comprising a clamp holder displaceably attached to a transverse carriage of a coordinate table having a chuck lever adjustably attached, which holds the workpiece in a position for movement between an upper turret table rotatably mounted in the upper part of the machine or in the upper part of an inner tool holder and a lower turret table which is equiaxially mounted in the lower part of the machine or in the lower part of an inner tool holder, wherein workpiece clamps are pivotally arranged so that, on collision with a stationary part they execute an avoiding movement, whereby an electrical conTact located in the region of said avoiding movement is actuated thereby interrupting or disconnecting a drive mechanism.

Claim 10

A workpiece clamp as claimed in claim 5, wherein a workpiece bearing support in a transverse-carriage holder is mounted for vertical pivotal movement about a bolt and switches off a mechanical drive of the punching press by means of an arrester lever in the course of its pivotal movement via an electric switch connected with the transverse-carriage holder.

Claim 11

A workpiece clamp as claimed in claim 5, wherein the workpiece clamp having a workpiece bearing support and an eccentric chuck lever is slidable between a support plate and a bridge, the normal position of the clamp relative to the support plate being maintained by pairs of conical plates which can be pressed together with centering effect under the action of springs and which, in the case of a shocklike stress on the workpiece clamp allow a sliding movement of the latter, whereby an electric switch located on the support plate switches off a drive of the coordinate table.

Claim 12

A workpiece clamp as claimed in claim 5 wherein the workpiece-bearing support is vertically pivotably mounted in the workpiece holder via a bolt and by the chuck lever located therein disconnects in the course of its pivotal movement through an electric switch connected with the holder, the coupling of the punch movement of the punching press, and, in addition, the workpiece holder, which in its normal position is maintained with centering effect by the conical plate pairs acted on by springs, is displaceable against the action of said spring-loaded pairs of conical plates, during which movement the electric switch connected with the support plate switches off a drive of the coordinate table.