Abstract: A magnetic disk drive device for reading from or writing to a magnetic disk having an actuator assembly composed of a yoke plate, an actuator housing magnetic heads, a stopper for restricting the range of rotation of the actuator, and a solenoid bracket housing an actuator locking mechanism, wherein the actuator assembly is assembled as a single unit for mounting to and removing from the disk drive device.

Abstract: A magnetic disk drive device for reading-out/writing-in information on/from a disk which comprises a yoke plate for rotatably supporting an actuator by a pair of bearings; a stopper for restricting the rotation range of said actuator; a solenoid bracket integrated in the yoke plate; a lock mechanism for locking said actuator at the innermost peripheral of the disk; a base plate having a recess for securing the yoke plate; an air filter formed in V-shape to purify air in said case; and a back-tension regulating piece in contact with a flexible print board.

Abstract: A magnetic disk drive device for reading-out/writing-in information on/from a disk which comprises a yoke plate for rotatably supporting an actuator by a pair of bearings; a stopper for restricting the rotation range of said actuator; a solenoid bracket integrated in the yoke plate; a lock mechanism for locking said actuator at the innermost peripheral of the disk; a base plate having a recess for securing the yoke plate; an air filter formed in V-shape to purify air in said case; and a back-tension regulating piece in contact with a flexible print board.

Abstract: A magnetic disk drive device for reading-out/writing-in information on/from a disk which comprises a yoke plate for rotatably supporting an actuator by a pair of bearings; a stopper for restricting the rotation range of said actuator; a solenoid bracket integrated in the yoke plate; a lock mechanism for locking said actuator at the innermost peripheral of the disk; a base plate in which a recess for securing the yoke plate; an air filter formed in V-shape to purifying air in said case; and a back-tension regulating piece in contact with a flexible print board.

Abstract: A magnetic head supporting device for supporting a magnetic head for writing information in and/or reproducing recorded information from a flexible magnetic disk. The magnetic head supporting device comprises a holding plate for holding the magnetic head, and a base plate attached to the holding plate and fastened to the carriage of a magnetic disk driving apparatus so that the magnetic head is supported opposite to the magnetic disk loaded on the turn table of the magnetic disk driving apparatus. The holding plate is provided in its upper surface with a positive pressure creating section in its front end to create a positive pressure for floating the magnetic disk, a floating section in its radially opposite sides to float the magnetic disk stably, and a negative pressure creating section in its central area to create a negative pressure for attracting the magnetic disk.

Abstract: A write protect switch device accommodated in a disk drive comprises an arm whose one end is supported by a frame of the disk drive, and a rotatable cam member supported by the other end of the arm, whose abutting end slides on a casing of a disk cartridge, the cam member displacing the other end of the arm in the direction of separating from the frame at the time of insertion of the disk cartridge; fitting into a write protect notch of the casing to displace the arm in the direction of approaching the frame when the abutting end arrives at the position of the notch; turning in the ejection direction of the disk cartridge with the arm kept close to the frame at the time of ejection; and after ejection, returning to the state before insertion of the disk cartridge.

Abstract: A disk clamping mechanism for a disk driving device capable of simultaneously achieving disk centering operation for centering a disk inserted in the disk driving device and disk clamping operation for clamping the disk between a hub and a spindle head for driving the disk, through the swing motion of a door for closing the disk inlet of the disk driving device, comprising: a door plate 17 provided with the door at the free end thereof and urged toward the front of the disk driving device; a swing frame slidably supporting the door plate 17 and urged in the opening direction by spring means; an elastic clamping arm connected at the rear end thereof to the hub so as to press the hub against the spindle head with the disk clamped therebetween; and an adjusting screw screwed in the swing frame so as to be in abutment with the clamping arm 29 to press the clamping arm in the clamping direction when the door is closed by swinging the swing frame.

Abstract: A disk clamping mechanism for a disk driving device employed in an apparatus for writing information in a disk and reading the information recorded in a disk, such as a recording/reproducing apparatus, has a rotary system including a hub for centering a disk relative to and pressing the disk against the spindle hub of the disk driving device and a collet for pressing the hub toward the spindle hub, and a nonrotational system including carrier for moving the rotary system toward and away from the spindle hub, a collet supporting member supporting the collet and fastened to the carrier, a ball receptacle loosely fitted in the collet supporting member, and a spring urging the collet supporting member and the ball receptacle away from each other.

Abstract: A disk recording-reproducing device of the type wherein in response to open/close action of a door the clamp operation against a disk is commenced, which is characterized by a door plate provided on its front end with the door and urged toward the door, a rotary frame supporting slidably the door plate and urged rotatably in the open direction of the door, and a lock plate formed with a notch engagable with a lock portion provided on the door plate at the close time of the door and urged in the engaging direction, whereby a force caused by door opening and locking is not applied unduly to a front panel of the device.

Abstract: A disk recording-reproducing device including a clamp mechanism and eject mechanism for a disk, which is characterized by an eject board abutable on an insertion front end of the disk and urged toward an insertion opening for the disk, a lock mechanism for locking the eject board when the disk is inserted up to a drive position, a lock-release member for releasing the locked state of the eject board, and a cam member rotatable as it is rubbed by the lock-release member at the time of insertion of the disk. Either the cam member or the lock-release member is movable in cooperation with the eject board to shift in the direction of insertion and ejection of the disk, and the other is movable in cooperation with the clamp mechanism to shift substantially perpendicularly to the revolution plane of the cam member, whereby a comparatively large dimensional clearance is allowed for the cam member and lock-release member.

Abstract: A disk recording and playback apparatus comprises a housing base, a cam body rotatably mounted on the housing base and actuatable in response to insertion of a magnetic disk, a bail mounted on the housing base and angularly movable toward and away from the housing base in response to actuation of the cam body, and a magnetic head mounted on the housing base and movable toward and away from an operative position in response to movement of the bail. When the magnetic disk is not inserted, the magnetic head is positioned away from the operative position by the bail disposed away from the housing base by the cam body, and when the disk is inserted, the cam body is actuated to release the bail to allow the magnetic head to be moved to the operative position.

Abstract: A carriage drive unit comprises a carriage, guide means for guiding the carriage, a drive motor having a rotatable shaft, a pulley fixed to the rotatable shaft of the drive motor, a drive belt having a looped portion extending around a peripheral surface of the pulley and having a portion fastened to the carriage for moving the carriage along the guide means in response to rotation of the pulley, and a resilient member disposed between the peripheral surface of the pulley and the drive belt for normally urging the looped portion of the drive belt radially outwardly, the resilient member being elastically deformable under pressure toward the peripheral surface of the pulley.