Abstract: The improvement of a tape recorder mechanism which comprises a push-back angle plate located at the leading end of swivel arm, an intermediate gear installed on the swivel arm and engaged to the winding gear, a knockback slider installed between the operation lever and main deck, and a rewind slider installed on the secondary deck. The swivel arm is linked with a transmission mechanism by a split spring which provides means for the advancing and returning movement of both parts. When the tape winding operation is stopped, the overwinding of a short piece of tape during stop operation is avoided automatically by simply pressing down the stop operation lever.