Abstract: A recording medium reproducing device includes a casing, a reproducing section provided within the casing, a recording medium changer provided adjacent to the reproducing section within the casing and a door provided at an opening of the recording medium changer. The recording medium changer has a receiving section rotatable about a center shaft and adapted to receive a number of recording media. The opening enabling a recording medium to be put into or taken out from the receiving section. The door being constructed such that when the door is opened or closed, the door turns about an axis which is coaxial with the center shaft of the receiving section.

Abstract: The present invention relates to a balance weight mounting apparatus for a tire wheel by which a balance weight can be automatically mounted on the tire wheel. A six-axes manipulator has a weight holder and hammer head provided at the distal end of the arm thereof. The weight holder and the hammer head can be moved by the operation of the manipulator to the location to which a balance weight is fed by a parts feeder and also can be moved within the plane perpendicular to the circumferential direction of a tire wheel supported by a tire wheel support unit. The balance weight of a predetermined weight fed by the parts feeder is gripped by the weight holder 32, abutted against that portion of the rim, on which this balance weight is to be mounted, of the tire wheel supported by the tire wheel support unit, and then mounted thereon by being driven by the hammer head.

Abstract: In a dynamic balancing machine for measuring amount and angular location of unbalance of a rotor piece during rotating the rotor piece by a drive motor, in order to position automatically the unbalance angular location to a predetermined angular position on bearings at a time of detection of the unbalance, a preset counter is used for providing a signal to stop the drive motor. Angular pulses each of which indicates rotation of the test rotor piece over a unit angular extent are generated by a rotary encoder, and phase indicating pulses are formed from the vibration signal from a vibration velocity pickup. After constant rotation of the drive motor, motor speed is reduced by a motor speed reduction signal, and, thereafter, the preset counter begins to count the angular pulses in response to presence of one pulse of the phase indicating pulses.