Boots – shoes – and leggings
Patent
1993-11-17
1996-09-10
Envall, Jr., Roy N.
Boots, shoes, and leggings
82148, B23B 2300, G06F 1900
Patent
active
055551785
ABSTRACT:
A machine tool such as a lathe for machining a workpiece having a longitudinal axis and being held at opposite axial ends by face drivers that are affixed to the spindle of a moveable headstock and securely contact the workpiece end faces with a predetermined pressure. A first servo loop is established to control the position of the headstock on the basis of detected position information and a second servo loop is established to control the movement of the head stock so that the pressure against the workpiece end faces is kept at predetermined values. The second servo loop may utilize the detected position of the headstock or it may utilize the monitored command value for purposes of judging whether modifications to the command value are necessary to provide the desired pressure values. A torque limiter also may be used to provide the desired control.
REFERENCES:
patent: 3731564 (1973-05-01), Diener et al.
patent: 3732757 (1973-05-01), Cottin
patent: 5025689 (1991-06-01), Mayer
patent: 5181441 (1993-01-01), Okada
Prazisions-Drehmaschinen hochster Genauigkeitsklasse, P. H. Knot & D. Szepesi, Feinwerktechnik & Messtechnik, vol. 95, No. 1, Jan./Feb. 1987, pp. 17-21.
Envall Jr. Roy N.
Garland Steven R.
Mitsubishi Denki & Kabushiki Kaisha
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