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:
May. 22, 1979
Filed:
Apr. 04, 1977
Steven L Roberts, Amherst, NH (US);
MFE Corporation, Salem, NH (US);
Abstract
A tape drive for moving a tape with a prerecorded clock track past a transducer at a constant velocity. An output signal from a speed servo circuit controls the energization, and hence the speed, of a tape driving motor. It responds to a tape speed signal derived in part from a power supply voltage and a speed reference signal derived from the power supply voltage. Voltage variations and temperature-induced variations in the power supply have a minimal effect on tape velocity. Tension servo circuits control the power to a driven motor in response to the speed reference signal and the speed servo output signal thereby to maintain the tape under tension. A brake and park gating circuit slows the tape and maintains the tape under tension when it stops. The speed reference signal undergoes an exponential rise during starting operations to minimize acceleration.