Abstract: A recorder-reproducer includes a rotary head cylinder against which a tape from a tape cassette is slidable, two movable bodies for moving the tape toward and away from the rotary head cylinder, two connectors having ends angularly movably coupled to the movable bodies, respectively, and a sole rotatable body to which opposite ends of the connectors are angularly movably coupled. The rotatable body has a recessed portion with at least one of the connectors being positioned for interference with the recessed portion. At least one of the connectors has two relatively slidable connector plates and a spring acting therebetween. The recorder-reproducer also includes a pivot shaft about which the rotatable body is rotatable, at least one of the connectors having a means for preventing said one of the connectors from interfering with the pivot shaft.

Abstract: A burglarproofing device for a car-carried acoustic apparatus prevents operation of the car-carried acoustic apparatus if the apparatus is stolen. The device allows only an owner of a car who holds a controller to render the apparatus operative. The controller is in the form of a card having keys for entering a pass number and a memory for storing a pass number thus entered. The pass number is transmitted to the car-carried acoustic apparatus when the controller is inserted into a hole formed in the car-carried acoustic apparatus, and is compared with a verification number stored in discriminating means, and only when coincidence is found, is power made available to the apparatus.

Abstract: A radio receiver has a first radio receiving part which receives the signal of the desired radio broadcasting station, a first receiving field intensity detector which detects the receiving field intensity of the desired signal received by the first radio receiving part, a second radio receiving part which receives an interference signal having the frequency adjacent to the desired signal frequency, a second receiving field intensity detector which detects the receiving field intensity of the interference signal received by the second radio receiver, a receiving frequency controller which generates a control signal for controlling the frequency of the desired signal received by the first radio receiving part in such a direction to become more remote from the disturbing signal frequency based on the receiving field intensities of the desired signal and disturbing signal detected by the first and second receiving field intensity detectors, and a local oscillation frequency controller which controls a local osci

Abstract: A pivotable changeover mechanism switches the power transmission path from a single reversible motor between parts performing a tape loading function and parts performing a tape unloading and cassette ejecting function in a cassette tape recorder. The pivotable changeover mechanism has a pivotable arm supporting a drive pinion, and the free end of the arm is connected to a shiftable reversing lever through a torsion spring which biases the pivotable lever positively in one direction and then the other, to mesh the pinion with a positive motion cam for unloading the tape and then with a cassette driving gear for ejecting the tape cassette to an unloading position. Through a connecting linkage, the reversing lever is shifted to switch the pinion from driving the positive motion cam to driving the unloading gear only after the positive motion cam has been rotated to fully unload the tape from the recorder head.