Abstract: An image-forming element including a hollow drum body rotatable about an axis and having an outer wall surface, a plurality of circumferentially extending electrodes supported on an electrically insulating layer arranged on the outer wall surface of the drum body, an electronic control unit containing a drivers circuit for energizing the electrodes, a support structure for supporting the drivers circuit, and contact means for electrically connecting each of the electrodes individually to the electronic control unit. The electronic control unit is arranged on the outer wall surface of the drum body. A recess for accommodating the drivers circuit may be provided in the outer wall surface of the drum body.

Abstract: A center clamp used with a machining tool having an annular edge has a C-shaped body having an inner end inside the edge and an outer end outside the edge and spaced from it along a clamp axis. A push rod extends along the axis through the outer body end. A rotary joint centered on the axis has an inner part on the inner body end and an outer part rotatable on the inner part about the axis. An axial actuator relatively axially shifts the body and the push rod and thereby clamps a workpiece between an end face of the rod and the outer part of the joint. An angular actuator pivots the push rod about the axis and thereby, when the workpiece is clamped between the rod and the joint, pivots the workpiece about the axis.

Abstract: A center clamp used with a machining tool having an annular edge has a C-shaped body having an inner end inside the edge and an outer end outside the edge and spaced from it along a clamp axis. A push rod extends along the axis through the outer body end. A rotary joint centered on the axis has an inner part on the inner body end and an outer part rotatable on the inner part about the axis. An axial actuator relatively axially shifts the body and the push rod and thereby clamps a workpiece between an end face of the rod and the outer part of the joint. An angular actuator pivots the push rod about the axis and thereby, when the workpiece is clamped between the rod and the joint, pivots the workpiece about the axis.

Abstract: A device and a method for distinguishing and automatically identifying and classifying tools using the device are disclosed. The device has a fixed reading unit attached to a machine tool and a coding system on a rotating tool. The coding system is a series of coding elements which are arranged on the rotating tool in the circumferential direction having a prescribed pitch spacing at different circumferential distances from one another, and which are successively sensed by the reading unit during rotation of the tool.