Abstract: The tape drive device for a magnetic transfer apparatus comprises a master tape and a slave tape wound about a rotary drum and kept in intimate pressure contact with one another by air jetted from a rectangular nozzle formed in an air guide member enclosing and secured to a magnetic head. During tape running, tension on each tape is controlled to a constant value by tension sensors associated with respective tape reels. When it is desired upon termination of transfer operation to stop the tape travel, the tape reels for a slave tape presenting a higher inertia are braked first. The remaining reels presenting a lower inertia are then acted upon and the tape tension sensing means associated therewith are operated to control the tension to a constant value in the course of simultaneous cessation of the tape travel.
Abstract: A tape guide system wherein a magnetic tape having different resistivities on its back and front travels in contact with guide elements, the members of these elements which are in contact with the tape being matched to the relevant face of the tape in respect of surface resistivity and/or of charge affinity. The members contacting the front of the magnetic tape accordingly consist of a conductive or low-insulation material and the members contacting the back of the tape consist of a high-insulation material. In alternative embodiments, the contact members can consist of a material of low conductivity, or of a plastic with an added conductive material. The novel guide system can be used in any type of high-speed magnetic tape transport mechanism. The invention also concerns the tape guide elements per se, and magnetic tape cassettes employing the tape guide system.
November 10, 1986
Date of Patent:
June 14, 1988
Roland Roos, Klaus D. Schomann, Wulf Muenzner
Abstract: In a magnetic disk drive in which a cantilevered arm for mounting a magnetic head slider assembly is pivoted to move the slider assembly between a loaded position adjacent a rigid magnetic disk and an unloaded position spaced apart from the disk, a mechanism is provided for limiting the extent of movement of the slider assembly relative to the arm to prevent damaging contact of the slider assembly with the disk when the arm is in the unloaded position and the disk drive is subjected to shock loads. The slider assembly is mounted in gimballed fashion at a free outer end of the arm by a flexure element having different portions secured to the arm and to the slider assembly and a gimballing protuberance engaging the arm.
Abstract: An apparatus using a disc-shaped record bearing medium having an engaging portion and at least one rotation indication portion, including a rotation mechanism for rotating the medium, a pressing device for mounting the medium on the rotation mechanism at the engaging portion, and a detection mechanism provided on a portion of the pressing device for detecting the rotation indication portion of the medium.
Abstract: A magnetoresistive (MR) read transducer assembly in which the thin film MR layer is longitudinally biased only in the end regions by exchange bias developed by a thin film of antiferromagnetic material that is deposited in direct contact only in the end regions of the MR layer and a thin film of soft magnetic material which extends across the transducer assembly. The longitudinal bias is developed by exchange coupling between the thin film of antiferromagnetic material and both the MR layer and the thin film of soft magnetic material in the end regions. However, the thin film of soft magnetic material is separated from the MR layer in the central region only of the MR layer by a decoupling layer which interrupts the exchange coupling so that transverse bias is produced only in the central region upon connection of a bias source to conductor leads which are connected to the MR layer within the end region.
Abstract: An information recording and reproducing apparatus of the hard disk type comprises a motor for rotatably driving hard disks secured to a driving hub attached to the driving shaft thereof, a pivot assembly having a pivot shaft supporting a swing arm for swing motion thereon, magnetic heads attached to the free end of the swing arm so as to be located opposite to the surfaces of the hard disks, respectively. The lower bearing among the bearings rotatably supporting the driving shaft of the motor and the lower bearing among the bearings rotatably supporting the pivot shaft of the pivot assembly are always urged in the same direction by bearing biasing means, respectively.
Abstract: An erasing head for magnetic recording medium by magnetizing said recording medium with a permanent magnet is improved by a ferrite head body having a slider plane wider than a track to be erased, and, a magnetic metal thin film covering said slider plane. Said magnetic thin film solves the problem caused by undesired natural magnetization of a permanent magnet, so as to improve the erase ratio and S/N ratio, and the use of slider plane wider than that of a track simplifies producing process of the head since no step is provided between the track to be erased and neighboring track, and no polishing process for smoothing said step is required.
Abstract: A tape loading device in which a tape is drawn from a tape cassette and wound on a rotary head cylinder, said device comprises a guide rail member formed substantially in an arcuate shape along the outer periphery of the rotary head cylinder having a guide slot including a curved point raised at the outside in the intermediate portion, first and second movable members each having at least one engaging portion guided to the guide slot of the guide rail member and movably supported at two front and rear positions in the guide slot of the guide rail member, first and second tape guide members aligned corresponding to the first and second movable members and introduced into the inside of the exposed tape of the tape cassette at the mounting time of the tape cassette, first drive mechanism coupled by the first movable member for transmitting a drive power for moving the first movable member from the initial loading position opposite to the mounting position of the tape cassette in the center of the guide slot to t
Abstract: A magnetic disk cartridge containing a floppy magnetic disk is provided with center core which has a groove where the vertical part of the core meets the flange upon which the disk is fastened by a double-sided adhesive ring. This groove can accommodate a portion of the adhesive ring which is positioned out of true. This ensures that such misalignment does not cause deformation of the disk and the deterioration in read/write performance with the disk. The groove also serves to prevent flange flashing from scraping fragments off the inside of the cartridge wall, and the possible harm such fragments cause if they stick to the disk.
Abstract: In a magnetic tape device including a cam, an operating member driven by the cam against force of an energizing member to bring a head to a position for press-fitting a tape, and a changeover member actuated by the cam for changing tape feeding direction, an improvement which comprises an electromagnetic plunger, a control member for linking the cam and the operating member to actuate the operating member in press-fitting position upon energization of the electromagnetic plunger and for releasing transmitting relation between the cam and the operating member both in the press-fitting state and in the middle of the press-fitting action upon deenergization of the electromagnetic plunger, and a link member for linking the cam and the changeover member during action of the operating member, thus not cancelling transmitting relation between the cam and the changeover member even if the action of the operating member is cancelled during action of the changeover member.
Abstract: A bearing assembly with an integrated single-stage ferrofluid seal apparatus incorporated therein, which assembly comprises a bearing assembly having an inner and outer race to define a raceway, a plurality of rolling elements retained within the raceway to permit rotation of the inner and outer races relative to one another, and a single-stage ferrofluid seal apparatus within the raceway and adjacent one side of the roller elements and which ferrofluid seal apparatus comprises a single-pole piece which extends into a close, noncontacting relationship with the surface of the inner or the outer race to define a radial gap, ferrofluid in the radial gap to form a ferrofluid seal, and an annular, permanent magnet secured to and adjacent the single-pole piece, the magnet having a generally-L sectional shape and in contact with one side and about one end of the pole piece to provide both a source of magnetic flux and as a magnetically insulating housing for the pole piece.
Abstract: A rotating head assembly comprises a fixed lower drum; a rotating member which has at least one head and also has a void hole in a position corresponding to the axis of rotation; supporting means which is disposed in a position farther away from the axis of rotation than the void hole and is arranged to support the rotating member rotatably relative to the fixed lower drum; and at least one composing means which is arranged by utilizing the void hole to compose at least a portion of the rotating head assembly.
Abstract: A characteristic curve indicative of a correlation between the ratio of rotational periods of tape supply and takeup reels and a remaining time or elapsed time for a running tape is approximated by straight lines, and clock pulses having frequencies corresponding to the slopes of the straight lines are counted by counters to measure the remaining or elapsed time. With this arrangement, the remaining time or elapsed time for the tape can be measured simply by counting clock pulses with a series of counters, without resorting to a complex arithmetic circuit.
Abstract: Disclosed is a tape cassette having a front cover urged in the direction for covering, by pivoting, a tape stretched along the front surface of a cassette case, and a cover-locking piece adapted to pivot within a plane thicknesswise of the tape cassette while being urged in the direction for holding the pivoting of the front cover when it is not in use. The tape cassette is further provided with an optical path aperture formed in a side surface portion thereof in order to form an optical path through the tape stretched inside the tape cassette when it is in use. The tape cassette is improved in its assembling efficiency while preventing disengagement of urging springs thereof in assembly. Moreover, it is possible to obtain satisfactory functions of the front cover and the cover-locking piece while preventing foreign matter such as dust from entering the inside of the tape cassette by covering the optical path aperture when the tape cassette is not in use.
March 23, 1983
Date of Patent:
May 27, 1986
Matsushita Electric Industrial Co., Ltd.
Abstract: A head arm mounting device for one or more scanning heads in recording/playback apparatus for disk records, especially flexible magnetic disks, includes a pivot shaft for the head arm, this shaft being held in a mount, with the aid of spring means, in a manner such that it has no axial play, and producing, in conjunction with the head arm loading spring, a head loading force which is constant and essentially independent of the head arm deflection. The mounting device consists essentially of a mount and a pivot shaft, either of which may be associated with a spring. A one-piece frame-shaped member with an integral spring constitutes an optimum mount. In an advantageous embodiment, means are provided for finely adjusting the force exerted by the head arm loading spring, and for compensating for tolerances in the spring force of the loading spring in the quantity production of disk drive apparatus.
February 11, 1983
Date of Patent:
March 25, 1986
Udo Boehm, Ernst-Juergen Grittmann, Klaus Schulze-Berge
Abstract: A recording and/or reproducing apparatus for a record carrier in the form of a tape contained in a cassette, which comprises at least one reel hub for taking up said record carrier which reel hub is axially accessible from opposite sides, is provided with a cassette holder which is movable between a loading position and an operating position. The cassette holder comprises a carrying member for a reel-hub hold-down means, which member is movable between a rest position and an operating position and for moving the carrying member there is provided at least one actuating member which projects into the path along which the cassette is inserted into the cassette holder.
Abstract: Apparatus for automatically producing a strip-like container housing chip-form electronic parts comprising a tape-like housing body provided with housing holes spaced thereon, a chip-form electronic part having no lead wire being housed in each of said housing holes.According to this automatic producing apparatus, a tape-like housing body is intermittently transported longitudinally, a respective chip-form electronic part being sequentially supplied by a supplying device into each housing hole provided on the housing body in the course of transportation thereof, the housing hole being sealed when the chip-form electronic part has been housed therein by a tape-like cover sheet supplied by a sheet supply device, the cover sheet being applied to the tape-like housing body by a cover sheet applying device, the aggregate of electronic parts thus produced being rolled round a reel of a winding device.
Abstract: An actuator for loading the main body of a platform having at least one read/write transducer associated with a data medium comprising at least one rigid movable arm (4), a flexible spring plate (10) attached to the rigid arm at one of its ends and supporting the platform (12) at its other end, the flexible plate (10) generating a force for pressing the main body against the data medium (14). The actuator is characterized in that flexible plates (10) are arranged in pairs, and means are provided for acting simultaneously upon the ends of two flexible plates (10) in order to bring them closer together. The means for acting simultaneously on the ends of two flexible plates are formed by two inclined cam profiles which act on a edge of a hole or slot provided in and along the central axis of each flexible plate and by means for shifting these cam profiles in relation to the edges of the flexible plates.
Abstract: The invention is a collating and stitching machine to arrange into informative and significant order a plurality of part-product or sheets. The machine has at least two rotating sheet delivery drums, the axis of rotation of which extend substantially perpendicularly to the conveying direction of an endless conveyor. The endless conveyor transports the folded sheets during the collating thereof with their folded backs extending transversely to the conveying direction and with the folded backs leading the direction of movement. The conveyor inserts the sheets one into the other. At least one stitching head is arranged in the return area to the endless conveyor to stitch the sheets together and thereby form a booklet, a magazine or the like.