Citizen Watch Company, Ltd.

Hiroshi Mabuchi

Kazunari Kume

Takayasu Machida

Maki Wakita

Isao Yabe

Hisao Wakabayashi

Yoshiyuki Ohishi

Kunio Suganuma

Hiroshi Kurafuji

Churyo Seki

A shutter locking mechanism for a FDD capable of securely keeping the shutter in opened state against any external impact. This mechanism comprises a pivot secured to the carrier for axially and rotatably supporting the shutter opening lever, and a projecting portion formed at the distal end of the shutter opening lever and fit to an aperture existing at the shutter opening lever contact side of the shutter in the loading position. The projecting portion enters the aperture at the right corner of the shutter in the loaded position while at the left corner claw portions of the stopper hold the shutter for preventing the distal end of the shutter opening lever from separating from the shutter.

Mechanism for locking a shutter of a floppy disk

The present invention provides a floppy disk drive which can removably receive a cartridge containing a floppy disk and which can travel a READ/WRITE head to the desired track on the floppy disk while rotating the floppy disk at a constant speed for effecting the desired read/write action under an electric-magnetic conversion. The drive is of a top-up type which includes a frame portion and a carrier which can be popped up from the frame portion. The frame portion includes a spindle motor for directly driving the floppy disk, a plurality of positioning pins for positioning the disk cartridge relative to the spindle motor, and a carriage carrying the READ/WRITE head for travelling the head to the desired track on the disk. The carrier is pivotably supported by the frame portion and adapted to receive the disk cartridge. The cartridge can be loaded into the lower portion of the carrier upon popping-up of the carrier. When the carrier is engaged by the frame, the cartridge is upwardly moved to a predetermined position within the carrier.

Floppy disk drive having a pivotally supporting cartridge carrier

A carriage traveling mechanism for a floppy disc drive which includes an .alpha. belt, two ends of which are fixed on the carriage and a part of which is wound around a drive shaft, a tension cam supported by the carriage to provide close contact with the .alpha. belt in the vicinity of its fixed end, and a tension spring fixed to the carriage to press and urge the tension cam toward the .alpha. belt, whereby the requested tension force is regularly provided to both ends of the .alpha. belt which are fixed to the carriage.

Carriage traveling mechanism for floppy disc drive

A receiving unit for timepieces, especially an improved receiving unit for a self-winding mechanism of self-winding timepieces. The receiving unit comprises guide portions and springs which are formed together as a unitary structure using resin.

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Tokyo, Japan

Hiroshi Mabuchi