The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 1982
Filed:
May. 21, 1980
Francis E Heiberger, Elmhurst, IL (US);
Danly Machine Corporation, Chicago, IL (US);
Abstract
A dual motor drive for the turntable of a numerically controlled machine tool in which separate forward and reverse drive motors geared to the turntable are used for eliminating the effect of backlash. Circuitry, including amplifiers, is interposed between a source of numerical control signal and the motors for energizing the motors alternatively in the numerically controlled mode depending upon the polarity of the control signal and at a speed which depends upon the magnitude of such signal. For operation in the lathe mode, sources of auxiliary control signal of first and second polarity are provided. Also provided are a polarity inverter and first and second sets of auxiliary switches for selectively reversing the direction of the respective drive motors so that when an auxiliary signal of first polarity is applied both motors serve additively to drive the turntable in the forward direction and so that when an auxiliary signal of second polarity is applied both motors serve additively to drive the turntable in the reverse direction. A manual selector determines the polarity of the auxiliary signal, the inversion thereof, and the direction of rotation, the numerical control signal being disabled during operation in the lathe mode.