Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1980-12-24
1982-08-10
Jillions, John M.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 683, B65H 1702
Patent
active
043434410
ABSTRACT:
An apparatus for driving a replaceable reel of magnetic tape is disclosed. The apparatus comprises a magnetic clamp for holding the reel to a cup-shaped driving member. The cup-shaped driving member carries a doughnut-shaped magnet and is provided with an integral center shunt member which extends into the center of the reel when the reel is positioned in driving engagement. The reel is provided with a central opening, and a circular metal plate is attached to the bottom surface of the reel hub to be attracted by the doughnut-shaped magnet. By extending the center pole piece a predetermined distance above the plane of the doughtnut-shaped magnet, the extended center pole piece provides an easy path for the flux as the members are being separated, since a relatively small air gap is maintained between the extended center pole and the central opening of the disk. At the point where the members separate, the strength of the magnetic field is not sufficient to adversely affect the information stored on the tape which is wound on the reel. In prior art arrangements, as the reel was being removed from the driving arrangement, the air gap which existed between the shunt member and a shorter center pole would increase to the point where the magnetic field would no longer be shunted through the metal shunt. The strength of the resulting stray magnetic flux was sufficient to adversely affect the information stored on the magnetic tape that was wound on the reel.
REFERENCES:
patent: 2437997 (1948-03-01), Charlin
patent: 2598846 (1952-06-01), Smith et al.
patent: 2709051 (1955-05-01), Bunch
patent: 3396919 (1968-08-01), Vayda
patent: 4327301 (1982-04-01), Janson
Cummins R. E.
International Business Machines - Corporation
Jillions John M.
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