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1. 发明专利

JPH07219406A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH07219406A
公开(公告)日：1995-08-18
申请号：JP908294
申请日：1994-01-31
申请人： HITACHI LTD
发明人： KATO TAKESHI , OMI YUTAKA , SHISHIDO KAZUO , SUZAKI MASABUMI , ISAKA YASUSHI
IPC分类号： G03G15/01 , G03G21/16
摘要： PURPOSE:To adjust the parallelism in the perpendicular direction to the fitting/ removing direction of a photosensitive belt to an intermediate transfer drum for attaining a high-quality image. CONSTITUTION:The right and left backlashes are regulated by two bosses 62b and adjusting screw holes 40d, and a photosensitive belt case positioning member 62, an adjusting piece 64, an adjusting screw 65, and a fixing screw 63 are arranged on a side plate 40 so that the photosensitive belt case positioning member 62 can be adjusted only in the vertical direction by the movement of the adjusting screw 65 and the adjusting piece 64. The parallelism in the perpendicular direction to the fitting/removing direction of a photosensitive belt to an intermediate transfer drum can be adjusted, and a large result can be exerted in mass production.

2. 发明专利

JP2000014010A CONTROL SWITCHING SYSTEM FOR PHASE MODIFICATION CONTROLLER AND CONTROL METHOD THEREFOR 失效
公开(公告)号：JP2000014010A
公开(公告)日：2000-01-14
申请号：JP17433498
申请日：1998-06-22
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ISAKA YASUSHI , WADA YOSHIHARU
IPC分类号： H02J3/06 , G05F1/70 , H02J3/18
摘要： PROBLEM TO BE SOLVED: To effectively utilize phase modifying equipment and protect a transformer for linkage by switching through a control switching circuit, so that the transformer for linkage will control the phase modifying equipment in overloaded state from a phase modification controller. SOLUTION: A phase modifying equipment 16 for reactive power compensation is placed between a transformer 14 for alternating current-to-direct current conversion and a transformer 15 for linkage of direct-current transmission equipment, and the phase modifying equipment 16 for reactive power compensation supplies reactive power to a voltage which is increased at the transformer 14 for alternating the current- to-direct current conversion to stabilize the supply of voltage. The calculation control circuit 20 of a phase modification controller 18 is fed with a power setting value signal 19 from a power set value circuit 17 during operation of an alternating current- to-direct current converter for performing control arithmetic operation, and outputs the result of the control arithmetic operation as 'on'/'off' operation commanding signal 21 to the phase modifying equipment 16 for reactive power compensation. When the transformer 15 for linkage is overloaded, an auxiliary relay is operated to change the control route. As a result, the effective utilization of the phase modifying equipment and the protection of the transformer device for linkage are made feasible.

3. 发明专利

JPH07143658A PROTECTION RELAY TRANSMISSION SYSTEM 失效
公开(公告)号：JPH07143658A
公开(公告)日：1995-06-02
申请号：JP28226293
申请日：1993-11-11
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： ISAKA YASUSHI , TAKAHASHI TORU , ARAKAWA KOJI , KOMATSU SHINJI
IPC分类号： H02H3/28
摘要： PURPOSE:To prevent erroneous detection at a reception terminal by mutually transmitting ON/OFF data of a device from a power transmission terminal to the reception terminal by software processing of arbitrary ready bit pattern. CONSTITUTION:A/D converters 2A and 2B input system current, perform the A/D conversion, and sample the amount of input electricity at the same timing. Transmission parts 3A and 3B input information which is obtained by generating the state of current differential protection relay devices 1A and 1B by software at operation parts 4A and 4B simultaneously with the output of the A/D converters 2A and 2B to produce a transmission format. An arbitrary ready bit pattern is produced from a transmission format produced by software. Then, when the arbitrary ready bit pattern becomes a certain value or a number other than an arbitrary ready bit pattern, a reception terminal detects that the device at the transmission terminal is malfunctioning, thus preventing erroneous detection at the reception terminal and protecting a power system with high sensitivity and reliability.

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