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    • 5. 发明专利
    • WIRE DOT PRINTER
    • JPH023335A
    • 1990-01-08
    • JP14682288
    • 1988-06-16
    • HITACHI LTD
    • ARIGA MASAKIAOKI KATSUMISHIMIZU SADAYUKIMITSUI NOBUOTAKEI KENJI
    • B41J2/24B41J2/30
    • PURPOSE:To attain uniform density as the result of printing even when a round platen is used, by a method wherein an impact force of wires arranged in the fore end of a printing head is made strong sequentially from the center to the ends of an array of the wires by adjustment of a spring or adjustment of a cancel time of a magnetic force by an electromagnetic coil. CONSTITUTION:When a current flows through a coil 2, a magnetic force by a magnet 1 is canceled, a strain energy stored in a spring 6 is released partially, an armature 5 is detached from a core 3 with a point S on a yoke 4 used as a fulcrum, and the fore end of a wire 10 projects from a fitting hole of a bearing 11 bonded to the fore end of a printing head nose part 7 and strikes paper 15 through the intermediary of an ink ribbon 16. Thereby an impact force Fimp is generated. The impact force Fimp can be varied by varied a tightening amount D of a screw 8 and adjusting a spring force F. On a flat platen 17, a screw 7 is tightened so that the impact force be increased sequentially toward end wires 10b with the impact force Fimp of a central wire 10a used as a basis. In a printer wherein a round platen 19 is used, the impact force Fimp of all the wires can be adjusted to be uniform substantially, a density difference is eliminated and thus excellent printing can be attained.
    • 8. 发明专利
    • PULSE CONTROLLER FOR INVERTER
    • JPS62233071A
    • 1987-10-13
    • JP7451986
    • 1986-04-01
    • HITACHI LTD
    • NAKAZATO MASAAKIMITSUI NOBUOHIROSE MASAYUKIINABA HIROMI
    • H02M7/48
    • PURPOSE:To prevent noise and torque ripples by causing respective inverter constituent elements to generate ignition-extinction pulses in a manner of distrib uting a given time in proportion to peak values of three-phase sine waves. CONSTITUTION:A current-type inverter converts a DC power 1 into AC through a DC reactor 4 and feeds a load induction moror 7. A controller of this inverter is furnished with one-chip microcomputer 10 performing a pulse pattern control and is further composed of input/output 101, 106, ROM 103, RAM 104, ALU 105, pulse pattern(event)-setting register 107, holding register 109, associative memory 110, comparator 112, excution controller 113 and others. Accordingly, numerical values, on which peak values of three sine waves with 120 deg. phase difference are to be retrieved, are obtained at every given time and an element, of which ignition is to be extinguished, is determined within said time. Also, a pulse width data-computing part operates to obtain data for dividing a given inproportion to peak values of three since waves according to a phase information.