| 摘要 |
A workpiece holding assembly for a machine apparatus is provided having an adjustable rail clamp attached to a rail which is secured to a work table of the apparatus. The rail is provided with front and back side referencing surfaces and the rail clamp includes an inner channel having an inside wall which comprises a reference surface for engagement with either the front or back side surfaces of the rail. The rail clamp includes a rail fastener means which functions to create a downward and inward force component which securely draws the inside wall against the rail reference surfaces to ensure a solid rigid connection. The rail clamp further is provided with a leveler connector means providing a quick release with a leveler head. The leveler head is provided with a connector portion that forms a corresponding connection with the leveler connector means. The leveler connector means includes a manually operated lever that draws the leveler head and rail clamp together so that reference surfaces become rigidly engaged in a manner to orient the leveler head in a predetermined relationship relative to the rail. The leveler head includes a cant adjustment means comprising a pivot part and two jack screws oriented in a triangular pattern so that movement of either of the jack screws will tilt the leveler head in whatever angular disposition is desired. The leveler head further includes a horizontal adjustment means comprising a cam which operates against a corresponding opening in the top surface of a workpiece clamping means. Rotation of the cam slides the leveler head horizontally relative to the workpiece clamping means. The leveler head also includes a vertical adjustment screw which moves the leveler head vertically relative to the rail clamp. The assembly can be provided with optional dielectric isolation parts when used in conjunction with certain functions of a wire EDM machine.
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