Tape drive speed changing apparatus

Claim 1

A tape drive speed changing apparatus for a magnetic tape player including a tape reproducing circuit, and a tape drive device for driving a tape, comprising: a motor as drive source for said tape drive device, said motor allowing its output shaft to selectively rotate at low or high speed; a changing switch for changing rotation of said output shaft of said motor from low to high speed and vice versa, said changing switch being normally in the condition that said output shaft is rotated at low speed; large and small drive pulleys connected to said output shaft and arranged adjacent to each other, said large drive pulley having a flange at the periphery thereof; a capstan in said tape drive device rotatably provided to extend upwardly of said player deck, said capstan carrying a flywheel attached thereto; a belt normally trained between said small drive pulley and said flywheel to impart rotation of said output shaft to said capstan, Said capstan being rotated at low speed while said magnetic tape being rotated at normal speed when said belt is normally trained between said small drive capstan and said flywheel; shift means for moving said belt to the position where the belt is shifted from the small drive pulley to the large drive pulley, said belt being controlled by said flange of said large drive pulley and shifted from said small drive pulley to said large drive pulley in response to movement of said belt made by said shift means; lock means for locking said shift means in the condition that said belt is moved to the position where said belt is trained to said large drive pulley, said changing switch being actuated by said shift means locked by said lock means to change rotation of said output shaft to high speed, during the time that said lock means locks said shift means said output shaft being rotated at high speed while said belt is trained between said large drive pulley and said flywheel, said magnetic tape being fast-fed; a control means for controlling operation of said lock means, in response to nonoperative position in which said lock means is brought by said control means, said shift means being returned to its original position at the same time said belt is shifted from said large drive pulley to said small drive pulley, on the other hand the drive speed of said magnetic tape being changed from fast speed to the normal playing speed.