Abstract: A tape cartridge positioning and ejection device for use in a magnetic tape recording and reproduction apparatus in which a rack and pinion combination is employed for positioning of the tape cartridge in the correct recording and reproduction position upon insertion and for ejection of the same when necessary in an efficient manner.

Abstract: This invention provides for an automatic tape stopping detective device in a magnetic recording and reproducing apparatus which detects the stopping of the run of the tape, having a take-up reel disk which rotates with the run of the tape, a crank pulley which always rotates whether the tape is running or not, a main lever which, being driven by the crank pulley, moves leftwards and rightwards by a definite stroke, a sub-lever which, having a sliding mechanism with the main lever, moves leftwards and rightwards with the main lever while the take-up reel disk is rotating and stops regardless of the movement of the main lever while the take-up reel disk is not rotating, and a control lever which, pivotally mounted on the main lever, moves with the movement of the main lever when the sub-lever stops.