Contact detecting apparatus

Details Contact detecting apparatus Contact detecting apparatus

1980-06-18

1982-05-18

Briggs, William R.

Metal working

Plural diverse manufacturing apparatus including means for...

Common reciprocating support for spaced tools

408 6, 408 8, 408 11, 408 35, 409134, B23Q 3155

Patent

active

043297714

ABSTRACT:
A contact detecting apparatus for detecting the contact of a workpiece and a tool which comprises a coil mounted on the periphery of a spindle head and connected to an AC power source for generating an induced current in a first looped secondary circuit formed by the workpiece, a work table, a machine bed, a column, a spindle head, a tool spindle and a tool in the tool spindle when the workpiece and the tool are moved relatively into contact with each other, and a second looped secondary circuit formed by a tool change device, the tool, the tool spindle and the spindle head when a tool change operation is performed. A detector is connected between the AC power source and the coil for detecting a change in an electrical signal caused by contact between the workpiece and the tool or contact between the tool change device and the tool to output a contact detecting signal. Another detector is provided to detect that a contact detecting signal is not generated, even if a tool change operation has been performed.

REFERENCES:
patent: 3133457 (1964-05-01), Martens
patent: 3636814 (1972-01-01), Esch
patent: 4203691 (1980-05-01), Nishimura

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