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公开(公告)号：US3721451A
公开(公告)日：1973-03-20
申请号：US3721451D
申请日：1970-12-23
Applicant: IBM
Inventor： FACKLER C , LENDERKING D
CPC classification number: H02P7/2885
Abstract: The invention concerns record medium driving arrangements for sound transducing apparatus, particularly set in a dictating and transcribing environment, and including mode control means for establishing a high-speed unregulated drive of the medium or regulated drive of the medium, as required during various operations. The apparatus incorporates a driving motor and circuits that insure a fast start-up time for the motor whether the conventional AC power source or battery is used. During start-up time, the full potential is applied across the motor and at a predetermined speed, the regulating circuit becomes effective to maintain the speed. This action applies during recording and playback operations. During other operations, such as a record medium loading and phasing operation and an automatic erase operation, the full power supply is applied across the motor as long as necessary to complete the operation and the regulating circuit remains ineffective. During an automatic recall operation enabling a transcriber to listen to a few previous words of dictated material, connections are made to apply the available potential in an opposite manner across the motor to reverse its direction of rotation and the regulating circuit also remains ineffective. Provision is also made for establishing a relatively high and low speed of operation of the motor to achieve 10 and 20 minute recording times, respectively. The rapid starting-up time permits a direct coupling of the motor to the driving mechanisms and elimination of an intermediate clutch assembly.
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