Contact detecting apparatus

Details Contact detecting apparatus Contact detecting apparatus

1980-12-22

1983-08-02

Briggs, William R.

Gear cutting, milling, or planing

Milling

With means to protect operative or machine

408 6, 408 8, 408 11, 409233, B23Q 1100, B23C 100, B23B 4700

Patent

active

043963226

ABSTRACT:
A contact detecting apparatus for detecting the contact between a workpiece and a tool in a machine tool which includes a coil mounted on a spindle head and connected to an AC power source for generating an induced current in a looped secondary circuit including the workpiece, a work table, a machine body, a spindle head, a brush, a clamp bar for clamping the tool on a tool spindle, springs interposed between the spindle and the clamp bar, the tool spindle and the tool, when the workpiece and the tool are moved relatively into contact with each other. The brush is kept contact with the clamp bar at the rotational axis of the tool spindle. A detector is connected between the AC power source and the coil for detecting a change in an electric signal caused by the contact between the workpiece and the tool.

REFERENCES:
patent: 3133457 (1964-05-01), Martens
patent: 3636814 (1972-01-01), Esch
patent: 4135848 (1979-01-01), Hughes et al.
patent: 4203691 (1980-05-01), Nishimura et al.
patent: 4329771 (1982-05-01), Eto et al.

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