Abstract: A flexible disk drive comprises a main frame, a magnetic head, a head assembly supporting the magnetic head so as to move the magnetic head in a tracking direction, and a guide rod fixedly attached onto the main frame by a metal fitting to guide the head assembly in the tracking direction. The main frame is made of a sheet metal and is provided with a recessed portion having a sidewall. The sidewall is faced to an end face of the guide rod with a small space left therebetween so that the recessed portion restricts the movement of the guide rod in the tracking direction.

Abstract: A flexible disk drive includes a case and a disk holder provided in the case. A flexible disk is mounted on the disk holder. A part of the disk holder abuts against an inner face of the case. Preferably, The part of the disk holder is a tip end portion of the disk holder. The tip end portion of the disk holder is bent in a slanted direction so as to enlarge an inlet of the disk holder for the flexible disk to be inserted.

Abstract: A main frame has a size where only high precision parts are mounted thereon and has structure where a front portion of a frame is deleted. A lower cover, which covers a lower surface of the main frame, has a function as a sub-frame mounting low precision parts corresponding to the front portion of the deleted frame, thereby playing a role as one frame by a combination of the main frame and the sub-frame of the lower cover.

Abstract: A flexible disk drive includes a notched portion at a main frame portion arranged with a motor, a sub board includes a cut groove at an end portion thereof and a wire extended from the motor is held by the cut groove of the sub board and is connected to the main board. Thereby, there can be provided FDD capable of achieving a reduction in cost by a reduction in a number of parts and simplification of a structure thereof.

Abstract: A mounting structure of a magnetic disk drive into a main body of computer is disclosed. The mounting structure comprises a lower frame of the magnetic disk drive including a bottom plate and a pair of side walls, and four cantilevered arms provided near front and rear ends of the pair of side walls, each of the cantilevered arms includes a continued portion connecting with each of the side walls at one point, a plurality of bent portions, a free end portion, and at least one screw hole for fixing onto the main body of computer by screws, the cantilevered arms are arranged so as to be that directions of bending stresses derived from screw-tightening torques and acting to the continued portions of the cantilevered arms are accorded with each other.

Abstract: A disk table in a magnetic disk drive is disclosed. The disk table comprises a disk table body having an opening, a chucking arm made of an elastic body, where one end of the chucking arm is fixed on a lower face of the disk table body and the other end of the chucking arm is set free, a chucking roller disposed on the other fee end of the chucking arm, where the chucking roller is protruded from an upper face of the disk table through the opening, and a stopper provided on the lower face of the disk table in the vicinity of the free end of the chucking arm, wherein the chucking arm is freely floatable in vertical direction, and the amount of separation of the free end of the chucking arm from the lower face of the disk table body is restricted by stopper when the chucking roller is urged downwards.

Abstract: A disk drive comprises a frame plate having a principal surface on which a receiving portion for receiving a disk and a recording/reproducing unit for carrying out recording/reproducing operations onto and from the disk are provided. The frame plate comprises a metal thin plate and has a rear surface to which a thin reinforcing plate substantially equal in length and width to the frame plate is adhered.

Abstract: A magnetic disk drive DD motor 20 including: a printed board 22 that is mounted on an upper surface of a frame 21 of a magnetic disk drive and that has a coil formed on a surface thereof; a spindle shaft 23 that is inserted into a through hole 22a formed in the frame and the printed board and that is supported so as to be vertical and rotatable with respect to the frame; a rotor that is constructed of a rotor case 24a mounted on the spindle shaft so as to confront the coil on the printed board and of a ringlike rotor magnet 24b mounted inside the rotor case; and a disklike disk table 25 that is fixed to the spindle shaft on an upper side of the frame and that supports a magnetic disk.

Abstract: A structure for preventing head judder of a magnetic disk drive is disclosed. The structure comprises an opening provided at front end portion of an upper plate of a head carriage, a gimbal disposed within the opening, a magnetic head hangingly disposed on a central lower face of the gimbal, a pivot spacer disposed between the upper plate and a central upper face of the magnetic head, and at least one pair of adhesive tapes, inner ends of the adhesive tapes are respectively stuck on near central upper face of the gimbal, and the adhesive tapes symmetrically extend towards right and left end of the gimbal.

Abstract: A mounting structure for an I/O (input/output) connector in a magnetic disk drive comprises a frame of the magnetic disk drive including a side wall, an I/O connector mounted on a printed board, and an engagement piece formed within the side wall that obliquely extends downwards and toward the inside of the side wall. The engagement piece is pushed towards the sidewall by side faces of the I/O connector and the printed board facing the inner face of the side wall when the printed board, on which the I/O connector is mounted, is inserted into the frame of the magnetic disk drive. A tip end of the engagement piece contacts a top face of the I/O connector when the printed board, on which the mounted board is mounted, is completely mounted onto the frame of the magnetic disk drive.

Abstract: A disk holding mechanism for use in a disk apparatus includes a disk holder unit (60) for holding a disk (40) inserted into the disk apparatus. The disk holder unit includes a leaf spring (63) which serves as an urging member for urging a substantial center of the disk downwardly from an upper surface of the disk with the disk held in the disk holder unit. The urging member prevents the disk from vibrating within the disk holder unit and restricts vertical movement of the disk itself even if the disk apparatus is subjected to external shake or shock. Thus, it is possible to constantly maintain stable head touch of a magnetic head to a magnetic disk medium (41) of the disk.

Abstract: A DD motor in a magnetic disk drive is disclosed. The DD motor comprising a sheet of metal plate formed in a two-stage disk-shaped, which includes an upper stage portion having an opening at the center thereof and a lower stage portion provided continued from the upper stage portion, a spindle shaft served as a central axis of the DD motor and inserted into the opening of the upper stage portion, and a resin portion formed integrally on a top face and a back face of the upper stage portion, in which magnetic material powder is mixed, wherein the resin portion connects the spindle shaft and the metal plate uniformly. Central axes of the small diameter disk-shaped upper stage portion and the large diameter disk-shaped lower stage portion are located coaxially. A peripheral edge of the upper stage portion is bent downwards to form a rim.

Abstract: A cramping structure of a guide bar for a head carriage in a magnetic disk drive is disclosed. The structure comprises a head carriage, a guide bar provided in parallel to the head carriage, a guide bar cramp provided along the guide bar in opposite side of the head carriage, wherein the head carriage includes a long plate-like base and a pair of cramp arms having a slit respectively, and extending from both ends of the base to the side of the guide bar which faces to the head carriage such that the cramp arm covers above of the guide bar; and a pair of engaging pieces provided under the pair of cramp arms respectively, wherein the pair of engaging pieces respectively includes a projection engaging the slit of the cramp arm and a notch supporting the guide bar from below thereof, wherein the pair of cramp arms urges the guide bar downwards, and the urging forces are received by the pair of notches of the engaging pieces.

Abstract: A sub-printed board 40 is disposed on a main plate of a main frame 30 at a position close to a front bezel 37. A main printed board 31 is provided on the main plate at a position opposite to the front bezel. A rotation drive mechanism for magnetic disks is mounted on the sub-printed board. A loading mechanism is assembled over the rotation drive mechanism in order to mount and eject the magnetic disks on and out of the magnetic disk drive. A head carriage 34 is disposed above the main printed board by means of a first supporting member provided on the main plate.

Abstract: A head feeding mechanism in a magnetic recording and reproducing device comprises: a "0" side carriage which has a "0" side magnetic head mounted on the surface of the front end portion thereof, and is fed in the direction of length of a slot formed in a magnetic disk holder, into which a magnetic disk is loaded, by a guide provided on a device frame; and a "1" side carriage which has a "1" side magnetic head 16 mounted on the surface thereof which is confronted with the "0" side magnetic head, and a base which is flexibly supported on the base 1a of the "0" side carriage, and driven ears extended from the middle portion thereof which are driven by the edge of the slot with the aid of an energizing spring.

Abstract: An improved disc drive is capable of compensating the relative positional shift of a head caused mainly by a temperature change. The disc drive includes a frame having a disc holder for rotatably driving a disc, a head for reading information recorded in the disc, a head carriage which is movable in a predetermined radial direction of the disc, a rotation shaft extending in parallel with the radial direction, a driving mechanism for moving the head carriage in the radial direction by engaging with the rotation shaft, an adjustment mechanism for compensating the positional shift of the head due to a change of ambient temperature by providing an additional deformation of the adjustment mechanism to the carriage.

Abstract: In a disk drive having a frame unit (63) in which a rear wall (81) is integrally formed with a bottom plate (63a) by press work such as bending, punching or the like, opening portions (53, 55, 57, 59) are inevitably formed as a designing requirement to form fixing members for fixing a circuit board or to prevent contact owing to the retreat of a carriage assembly (67) at the time of punching or press work of the rear wall (81) of the frame unit (63). To provide a disk drive having high reliability by preventing dust from entering into the disk drive from the opening portions (53, 55, 57, 59) and by preventing destruction of data on a disk owing to pressing of dust onto the disk by a recording and reproducing head, rear cover (83) is mounted on the rear wall (81) for closing the opening portions (53, 55, 57, 59).

Abstract: In a magnetic disk driver for driving a magnetic disk inserted thereinto, a pair of locating members locates both ends of a guide bar to mount the guide bar on a main surface of a main frame in cooperation with a guide bar cramp. Disposed in the vicinity of a magnetic head, one of the locating members includes a projecting portion which projects on the main surface of the main frame. The projecting portion may be a projection squeezed out of the main frame by half blanking. Disposed over the main surface of the main frame and apart from the main frame, a head carriage holds a magnetic head movably along a predetermined radial direction to the magnetic disk. The head carriage comprises a head carriage body and a supporting frame for supporting the head carriage body. The supporting frame projects into the main surface of the main frame and is fitted on the guide bar.

Abstract: A numerically controlled apparatus wherein a tool can be returned by a high speed retrograding operation without damaging a chip of a tool or a work. The numerically controlled apparatus comprises a command executing block which decodes a working program for each of block commands and controls controlling driving of a tool to work a work. A retrograde command storage block extracts data necessary for the production of a retrograde block command from the working program and stores the extracted data therein. Upon reception of a retrograding signal, an escapement command producing block produces an escapement block command, and a retrograde block command producing means produces a retrograde block command. Then, an escapement/retrograde command execution controlling block causes the command executing block to execute the escapement block command and the retrograde block command.

Abstract: An improvement in a numerical control apparatus for controlling a threading operation with a tap. A numerical control apparatus of the present invention which is simple in construction and needs no dummy mechanism such as a floating tapper; and which minimizes the drift of the tap in the bottom of a tapped hole by an instruction to a feed shaft which switches an acceleration or deceleration time constant, and a simultaneous instruction to a spindle device which controls the position of the spindle device. Thus, the machining precision of the bottom of the tapped hole is improved, and a high-speed tapping operation is possible. Furthermore, the numerical control device also is capable of preventing the tap and the threaded portion machined by the tap from being damaged upon an occurrence of an abnormal condition by an instruction from the removing control unit.