Abstract: A magnetic disk apparatus which protects magnetic disks from being damaged by an external shock applied thereto. The magnetic disk apparatus includes a shock absorber provided in the enclosure for absorbing a shock of the magnetic disk caused by vibration of the magnetic disk. Alternatively or additionally the magnetic disk apparatus includes a shock absorber for covering a surface of the enclosure which houses the disk drive components.

Abstract: A magnetic disk drive comprises a plurality of disks that have a laminated arrangement with equally fixed spaces respectively and are rotatably mounted a disk driving unit that forces the disks to rotate, a plurality of positioners mounted and movable in the direction of the tracks of the disks respectively, a positioner driving unit that drives the positioners so that their respective ends can traverse the tracks, and a plurality of reproducing/recording elements e.g., unitary magnetic heads that are fixed on the respective ends of the positioners and perform read/write operations for the surfaces of recording media of the disks, respectively. Each of the unitary magnetic heads is constructed such that each of said heads has a predetermined inclination is to the respectively corresponding surface of recording media of the disks, preferably by forming a sloping surface on one end of each positioner.Preferably, circuits for controlling the disk driving unit and the magnetic head, etc.

Abstract: Disclosed herein is a magnetic disk drive including a head actuator for moving a head across tracks of a magnetic disk. The head actuator includes an actuator arm rotatably mounted in a housing, for supporting at its tip the head. The magnetic disk drive further includes an inner stopper adapted to come into contact with the actuator arm, for stopping excess movement of the actuator arm toward an inner circumferential portion of the disk, and an outer stopper adapted to come into contact with the actuator arm, for stopping excess movement of the actuator arm toward an outer circumferential portion of the disk. The inner stopper is the same in structure as the outer stopper. Each of the inner stopper and the outer stopper includes a shaft fixed to a base of the housing and having an outer circumferential surface formed with an annular groove, and a cylindrical rubber cushion mounted on the outer circumferential surface of the shaft so as to cover the annular groove.

Abstract: A magnetic disk drive for locking an actuator mounted with a magnetic head in a safety zone. The magnetic disk drive comprises a magnet, fixed yoke members and a stopper for setting a stop position of rotations of the rotary actuator in such a position that torque by the fixed yoke members and the magnet is maximized. The fixed yoke members form a magnetic circuit for the magnet in all or a part of a movable range of the rotary actuator. The fixed yoke members include a first area having a gap width uniformly reduced in a lock direction to retract the rotary actuator and a second area having a gap width smaller than a gap width of the first area. The fixed yoke members are mechanically separated from each other.

Abstract: Disclosed is a magnetic disk apparatus which protects magnetic disks against external and internal magnetic fields and electromagnetic waves. This magnetic disk apparatus comprises at least one magnetic disk; rotation unit for rotating the magnetic disk; a magnetic head for recording and reproducing information on and from the magnetic disk; an actuator for supporting the magnetic head and moving the magnetic head to a given position on the magnetic disk; and an enclosure for covering those individual components. According to one aspect of this invention, the enclosure is made of a ferromagnetic material. According to another aspect of this invention, the enclosure is made of a non-magnetic material and a shield layer made of a ferromagnetic material is provided at least in that region of an inner wall of the enclosure which corresponds to the movable range of the magnetic head.

Abstract: A magnetic disk drive comprises a plurality of disks that have a laminated arrangement with equally fixed spaces respectively and are rotatably mounted a disk driving unit that forces the disks to rotate, a plurality of positioners mounted and movable in the direction of the tracks of the disks respectively, a positioner driving unit that drives the positioners so that their respective ends can traverse the tracks, and a plurality of reproducing/recording elements e.g., unitary magnetic heads that are fixed on the respective ends of the positioners and perform read/write operations for the surfaces of recording media of the disks, respectively. Each of the unitary magnetic heads is constructed such that each of said heads has a predetermined inclination to the respectively corresponding surface of recording media of the disks, preferably by forming a sloping surface on one end of each positioner.Preferably, circuits for controlling the disk driving unit and the magnetic head, etc.

Abstract: A magnetic disk drive comprises a plurality of disks that have a laminated arrangement with equally fixed spaces respectively, and are rotatably mounted, a disk driving unit that forces the disks to rotate, a plurality of positioners that are mounted movably in the normal direction to the tracks of the disks, respectively, a positioner driving unit that drives the positioners so that their respective ends can traverse the tracks, and a plurality of reproducing/recording elements e.g. unitary magnetic heads that are fixed on the respective ends of the positioners and perform read/write operations for the surfaces of recording media of the disks respectively. Each of the reproducing/recording elements is constructed such that each of the elements is adjustable in the rolling direction with respect to the respectively corresponding surface of recording media of the disks and adjustable in the distance from the respectively corresponding surface of recording media of the disks.

Abstract: A disc apparatus includes rotatable discs each having a recording disc surface or surfaces, a head for recording and reproducing information to or from the disc, and an actuator for moving the head along the surface of the disc. The disc, the head, the actuator, and the like are accommodated in a rectangular housing which is supported on a frame of the apparatus by four dampers arranged at four corners of the housing. The center of gravity of the housing is located nearer one corner with respect to the other corners. The spring constant of the damper located at the corner which is at the greatest distance from the center of gravity is smaller than the spring constants of the other dampers.

Abstract: A thermoplastic resin composition comprising (I) from 40 to 98 parts by weight of a thermoplastic resin comprising (A) from 10 to 90% by weight of an imidemodified copolymer obtained by reacting a composition consisting of a polymer and a primary aromatic amine to a polymer prepared by copolymerizing (a) a monomer mixture comprising an aromatic vinyl monomer, an unsaturated dicarboxylic acid anhydride and a vinyl monomer copolymerizable therewith, to (b) a rubber polymer component, to convert from 80 to 100 mol % of acid anhydride groups in the polymer to imido groups; (B) from 10 to 90% by weight of a graft copolymer prepared by copolymerizing (a) a monomer mixture comprising an aromatic vinyl monomer, a vinyl cyanide monomer and a vinyl monomer copolymerizable therewith, to (b) a rubber polymer component; and (C) from 0 to 80% by weight of a copolymer prepared by polymerizing an aromatic vinyl monomer, a vinyl cyanide monomer and a vinyl monomer copolymerizable therewith; and, (II) from 2 to 60 parts by wei

Abstract: A daisy wheel type printing device comprises a daisy printing wheel including a plurality of type holding members having type at the respective ends thereof, wheel driving motor for rotating the daisy printing wheel to set the type designated by input character data to a printing position, a printing hammer for hitting the type set to the printing position, and a control circuit for driving the printing hammer when a preset a period of time has elapsed after the type designated by the input character data has arrived at the printing position. The preset period of time is varied in response to the rotation amount by which said daisy printing wheel is rotated to set the designated type at the printing position. The delay is larger for a wheel rotation of less than a predetermined amount than it is for a large rotation.

Abstract: A thermoplastic resin composition comprising:(A) from 10 to 90 parts by weight of an imide-modified polymer having an imido group and obtained by reacting ammonia and/or a primary amine to a copolymer prepared by the polymerization of a monomer mixture comprising from 50 to 70% by weight of an aromatic vinyl monomer and from 30 to 50% by weight of an unsaturated dicarboxylic acid anhydride;(B) from 10 to 90 parts by weight of a graft copolymer prepared by copolymerizing from 30 to 75% by weight of a mixture comprising from 40 to 80% by weight of a rubber-like polymer having a weight average particle size of from 0.3 to 0.6 .mu.m and from 20 to 60% by weight of a rubber-like polymer having a weight average particle size of from 0.1 to 0.2 .mu.

Abstract: In the emulsion polymerization of a monomer mixture comprising an aromatic vinyl compound, a vinyl cyanide compound and if desired, other vinyl compounds copolymerizable therewith in an aqueous medium, the vinyl cyanide compound is further added to the polymerization system in a controlled velocity during the substantial period of polymerization from the initial stage. When the copolymer thus obtained is incorporated into, for example, an acrylonitrile-butadiene-styrene terpolymer composition, thermoplastic resin compositions not coloring upon molding are obtained with a good impact resistance and heat resistance.

Abstract: A memory pack is provided having a random access memory connected between a positive power source terminal and a ground terminal, an addressing terminal coupled with the random access memory, and a data input/output terminal coupled with the random access memory. The memory pack further includes an LED energizing terminal, a light emission element which is connected between the LED energizing terminal and a positive power source terminal, the LED being lit by an energizing signal applied to the LED energizing terminal, a RAM energizing terminal and a photocoupler which is connected between the RAM energizing terminal and the random access memory and which responds to an energizing signal applied to the RAM energizing terminal to apply an output signal to the random access memory thereby to set the random access memory to be operative.

Abstract: An electronic cash register is provided which comprises a keyboard including a plurality of entry keys, function keys and department keys, a memory, a first interface circuit with which a cashier memory pack is mechanically, electrically and disconnectably coupled, a second interface circuit with which a terminal memory pack is mechanically, electrically and disconnectably coupled, and a central processing unit connected to the keyboard, the memory, and the first and second interface circuits in which the sales information generated upon depression of the entry keys, the function keys and department keys are loaded into the memory and at least the sales total for a customer in the sales information is loaded for each transaction into the cashier memory pack and the terminal memory pack.

Abstract: A data processing apparatus for an electronic cash register comprises a keyboard having a plurality of entry keys, a printer, a memory unit, an interface circuit with which a memory pack storing sales data is mechanically, electrically and removably coupled and a data processing unit connected with the keyboard, the printer, the memory unit and the interface circuit. Responding to operations of one of the keys for sales data selection, the data processing unit energizes the memory pack connected to the interface circuit to read out the sales data corresponding to the operated sales information key from the energized memory pack and write the read-out sales data into the memory unit and then issue a print signal to the printer for printing the sales data.

Abstract: An aromatic polymer is prepared by polymerizing a diphenolate compound, of a dialkali metal salt of a diphenol with a dihalodiphenyl compound, of a dihalogenobenzenoid compound having an electron withdrawing group in at least one of the positions ortho or para to each of the halogen atoms, at 200.degree. C. to 400.degree. C. in the presence of from 0.1 to 30% by weight of an inert nonpolar aromatic reaction lubricant.