Sony Corporation

Masakatsu Hosoya

Takashi Yamazaki

Toshiro Ota

Noriyuki Koga

Coil springs 96 and 97 are incorporated in a driving-side transmission mechanism 61 so as to absorb backlashes between a rack 55 and a drive gear 59a. Since the respective backlashes between the drive gear 59a and the rack 55 are absorbed by way of the coil springs 96 and 97, phase matching at the sole driving-side transmission mechanism 61 is required as phase matching work of toothed portions of gears during assembly, thereby simplifying the assembling task and shortening the amount of assembling hours. Additionally, since a coil spring is not included in the rack 55, the rack can be designed to be small-sized in its width direction, thereby minimizing the moment of a force about the meshed engagement point, acting on an optical head carriage 53, and reducing transfer loss in the head.

Disk unit and process for assembling transmission mechanism used for

In a mode-change mechanism for a tape recorder, a driving bar is mounted for movement between a record/playback mode position and a stop mode position, a partially toothless gear has a cam thereon engageable by a cam follower on the driving bar for moving the latter between its mode selecting positions in response to turning of the partially toothless gear between immobile positions thereof in which opposed first and second toothless portions on the outer periphery respectively face a driving gear for intermittently rotating the partially toothless gear, a lock lever is selectively engageable with one of a pair of stop elements on the partially toothless gear for halting rotation of the latter in a respective one of the immobile positions thereof, and a spring urges the driving bar toward one of its mode selecting positions, with the cam, toothless portions and stop elements on the partially toothless gear being angularly positioned in respect to each other so that, when the lock lever is disengaged from one of the stop elements, the force of the spring on the driving bar is effective, through the action of the cam follower on the cam, to initiate turning of the partially toothless gear from its prior immobile position for meshing engagement with the driving gear.

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Chiba, Japan

Masakatsu Hosoya