Robbins Industries, Inc.

Tobins Industries Corporation

Art Seides

George Alexandrovich, Sr

Herman D Post

Jack Friedland

A cassette-type demagnetizer for magnetic heads of tape-recording and/or playback units has a housing provided with an open side which is juxtaposed with a magnetic head of a unit when the demagnetizer has placed onto the latter. A rotatable tape supply hub and a rotatable tape take-up hub are located in the housing and can be driven by drive spindles of the unit. A tape is convoluted onto the supply hub and is withdrawn from the same and convoluted onto the take-up hub when the latter is rotated. A circular permanent magnet is rotatably mounted in the housing adjacent the open side of the latter and the tape is trained about it in order to rotate the magnet as the tape travels, so that an alternating magnetic field is produced which demagnetizes the head of the unit. A shielding arm of soft iron is pivotably mounted in the housing and is urged into engagement with the periphery of the take-up hub by a biasing spring. The arm has an end portion which progressively moves between the circular permanent magnet and the open side of the housing, in order to progressively reduce the magnetic field to zero, as the amount of tape on the take-up hub increases and the diameter of the hub and tape package thereon therefore also increases and urges the arm in direction opposite to the biasing force of the spring.

Cassette-type head demagnetizer

A cassette housing has an open side which faces the head and capstan roller of a tape recording and/or playback unit of the type using magnetic-tape cassettes, when the housing is placed in operative position on the unit in lieu of a tape cassette. One or more first pads are provided for wiping over the periphery of the capstan roller when the latter is rotated and a cam and follower arrangement driven by the tape drive of the unit performs oscillatory motions and wipes over the tape-engaging surface of the magnetic head of the unit.

Growing community of inventors

Jericho, NY, United States of America

Art Seides