Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-01-28
1994-09-27
Raevis, Robert
Communications: electrical
Condition responsive indicating system
Specific condition
408 6, G08B 2100
Patent
active
053510399
ABSTRACT:
A toolholder device for a machine tool comprises a holder body driven by a machine tool drive spindle, and a toolholder supported on the holder body so as to be circumferentially and axially displaceable. The holder body and the toolholder are provided with displacement detection elements which are arranged circumferentially in interdigitating relation. A support shaft extends from either member of the holder body and the toolholder toward the other member. The outer surface of the support shaft and the inner surface of a support hole of the other member to be fitted over the support shaft are formed with helical guide grooves which are opposite to each other and slopingly extends with respect to the rotational axis of the toolholder device. Balls are interposed between the opposite guide grooves to form a displacement translation mechanism which converts a rearward axial displacement of a tool and the toolholder due to overload axial thrust into a circumferential relative displacement between the adjacent detection elements. The relative displacement of the detection elements is detected by a detection unit which issues a warning signal. A compression spring in the device resists the axial displacement of the toolholder unless the axial thrust exceeds a predetermined value.
REFERENCES:
patent: 3387669 (1968-01-01), Wise, Jr.
patent: 3652099 (1972-03-01), Bilz
patent: 3851525 (1974-03-01), Parkinson
patent: 4193720 (1980-03-01), Machida
patent: 4488443 (1984-12-01), Parkinson
patent: 4829834 (1989-05-01), Masom
Mase Yoshiaki
Nishikawa Hirotaka
Oketani Tetsuya
Sakakibara Yukihiro
Howa Machinery Ltd.
Oda Christine K.
Raevis Robert
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