Bulk degausser
First Claim
1. A drive mechanism for translating and rotating a reel of high energy magnetic tape, said mechanism being a part of a bulk degausser which erases said tape, said degausser including a frame holding a coil for generating magnetic fields, said coil defining a window for passage by said tape, said drive mechanism comprising:
- an arm guided for reciprocal movement along a path extending through said window, said arm having a forward end and a rearward end;
a hub for holding said reel and rotatable carried adjacent said forward end;
a motor carried by said arm adjacent said rearward end;
an endless means driven by said motor and trained around said hub to rotate said hub, said endless means having two runs extending between said hub and said motor with the first run advancing toward said hub and the second run advancing toward said motor when said hub is driven;
a support held by said frame; and
a drive carried by said support for selectively engaging one of said runs to move said reel through said window.
2 Assignments
0 Petitions
Accused Products
Abstract
A bulk degausser for erasing a reel of high energy magnetic tape. The degausser includes a circuit for generating magnetic fields including a coil defining a window for passage of the reel of tape. The coil includes a first winding having relatively few turns and a second winding, inductively coupled to the first winding, having relatively many turns. The circuit also includes an ac power supply connected to the first winding and a dc power supply connected to the second winding. A resonance capacitor is interconnected with the second winding for substantially balancing the inductive reactance of the second winding at the frequency of the ac power supply. The circuit also includes an isolation relay, interconnecting the capacitor and the second winding with the dc power supply, for isolating the dc power supply when the first winding is energized by the ac power supply. Energization of the second winding by the dc power supply causes a tape in said window to undergo a dc magnetic field, and energization of the first winding by the ac power supply induces ac current in the second winding resulting in a reel in said window experiencing an ac magnetic field. A drive mechanism for translating and rotating the reel of high energy magnetic tape with respect to the coil, is also disclosed.
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Citations
13 Claims
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1. A drive mechanism for translating and rotating a reel of high energy magnetic tape, said mechanism being a part of a bulk degausser which erases said tape, said degausser including a frame holding a coil for generating magnetic fields, said coil defining a window for passage by said tape, said drive mechanism comprising:
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an arm guided for reciprocal movement along a path extending through said window, said arm having a forward end and a rearward end; a hub for holding said reel and rotatable carried adjacent said forward end; a motor carried by said arm adjacent said rearward end; an endless means driven by said motor and trained around said hub to rotate said hub, said endless means having two runs extending between said hub and said motor with the first run advancing toward said hub and the second run advancing toward said motor when said hub is driven; a support held by said frame; and a drive carried by said support for selectively engaging one of said runs to move said reel through said window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of erasing a reel of high energy magnetic tape using a bulk degausser comprising:
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a frame; a coil held by said frame and defining a window for passage of said reel, said coil including a first winding having relatively few turns and a second winding inductively coupled to said first winding and having relatively many turns; power supply means for selectively providing ac power to said first winding and selectively providing dc power to said second winding; a drive mechanism for selectively translating said reel with respect to said coil, and selectively rotating said reel with respect to said coil; and means for controlling operation of said power supply means and drive mechanism, said method comprising the following steps; (a) translating said reel from a first position wherein said reel is disposed substantially outside said window toward a second position wherein said reel is disposed substantially inside said window; (b) rotating said reel and providing dc power to said second winding when said reel is in its second position; and (c) translating said reel from said second position toward said first position while rotating said reel and providing ac power to said first winding. - View Dependent Claims (11, 12, 13)
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Specification