Apparatus in an automatic telephone answering device utilizing a single motor for scanning a tone arm across a grooveless recording disc to selectively play back a message magnetically recorded thereon in a spiral path as well as for rotating the turntable. The apparatus includes an electromagnetic clutch powered by a positive belt drive coupled to the motor for driving a spirally contoured cam to transport the tone arm across the disc. A control circuit including an optoelectronic switch positioned adjacent the edge of the turntable to receive light reflected from a reflective spot on the turntable edge is also provided to initiate scanning by the tone arm coincident with the reflective spot passing by the optoelectronic switch. This insures that the tone arm transducer will begin scanning at the same point for each subsequent playback and/or record operation and, as a result, track the spiral recording path on the grooveless disc.
A magnetic recording or reproducing apparatus comprising a rotatable magnetic body for recording or reproducing information detachably mounted on a rotating support which is driven by a motor, a magnetic head for magnetically transmitting the information to or from said magnetic body, said magnetic head being adapted to move in association with a cam mounted on a member for detecting the position of said magnetic head, said position detecting member including portions which are arranged, respectively, to start and turn off means for driving the apparatus and a portion which does not drive said driving means while a sensor is located on said portion, and means for recording the information to be stored in said magnetic body or for reproducing same stored therein.
The apparatus of this invention has an electric motor assembled integrally with a motor brake for rotating a magnetic disc, a rocking arm fitted at its tip end with a magnetic head, and a rotary solenoid to shift the magnetic head by getting engaged with the rocking arm, energized by a spring so as to rock in one direction, and is so constructed as to stop and lock the electric motor and the magnetic disc by operation of the motor brake, when power is cut off, and to turn the rocking arm until the rocking portion of the rotary solenoid is rotated in said one direction by the force of the spring to shift and lock the magnetic head to a landing zone defined within the magnetic disc, thus preventing the magnetic head and the magnetic disc from rubbing or running against each other when the power is cut off.
A magnetic recording apparatus including a base, a drive shaft mounted on the base for rotating a magnetic disc, a movable member adapted to reciprocate in a radial direction of the magnetic disc while holding a magnetic head, the movable member being urged in a first direction; a motor; a gear reduction mechanism including a plurality of gears wherein the plurality of gears and the drive shaft are connected to the motor wherein the rotational direction of the motor is controlled in either forward or reverse operation selectively; a support portion; and a belt mechanism for pulling said movable member in a direction opposite the first direction, one end of the belt being connected to a rotation output portion of the reduction mechanism, an intermediate part of the belt mechanism engaging the movable member and an opposite end of the belt mechanism being fixed to the support portion such that accurate tracking action is attained.
