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1. 发明专利

JPH03259166A MEASURING CIRCUIT FOR SURFACE POTENTIAL OF PHOTOSENSITIVE DRUM OF ELECTRONIC PRINTER 失效
公开(公告)号：JPH03259166A
公开(公告)日：1991-11-19
申请号：JP5638290
申请日：1990-03-09
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： NAKAZAWA TAKASHI , OSHIMA MINORU , ISHIKAWA MASAMI , OGAWA TSUKASA , UMEDA TAKAO , MIYASAKA TORU
IPC分类号： G01R19/04 , G01R29/12 , G03G15/00
摘要： PURPOSE:To detect the wear of the photosensitive drum with a small error by providing a peak hold circuit which detects and holds the peak value of the signal generated by rectifying a detection signal. CONSTITUTION:A rectifying circuit 7 outputs a signal nu7 in synchronism with the signal nu5 of a driving circuit 5. The amplitudes A1 and A2 of the signal nu7 correspond to the potentials of the photosensitive body 3 and a reference potential part 2 and when a timing circuit 10 sends a timing signal nu10 to a peak hold circuit 8 so as to detect the amplitudes A1 and A2, the peak holding circuit 8 outputs a signal nu8, which is held by detecting the 1st peak of the signal nu7 arriving after the timing signal nu10 is generated. Consequently, the potentials of the photosensitive body 3 of the photosensitive drum and reference potential part 2 of the electronic printer are detected with a small ripple and the degree of deterioration of the photosensitive drum can be detected with a small error.

2. 发明专利

JPH0477770A ELECTROSTATIC RECORDER 失效
公开(公告)号：JPH0477770A
公开(公告)日：1992-03-11
申请号：JP19053490
申请日：1990-07-20
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： NAKAZAWA TAKASHI , OSHIMA MINORU , ISHIKAWA MASAMI , OGAWA TSUKASA , UMEDA TAKAO , MIYASAKA TORU
IPC分类号： G03G15/02 , G03G15/00 , G03G21/00
摘要： PURPOSE:To precisely control the surface potential of a photosensitive body and to stably set it by separating the measuring cycle from the controlling cycle of the surface potential of the photosensitive body, measuring and holding the surface potential within the optional cycle and controlling the electrostatic charge quantity thereof in the controlling cycle continued from the measuring cycle based on the measured result. CONSTITUTION:In the first measuring cycle M0, the surface potential of the photosensitive body 3 is measured by a potential sensor 4 at timing which is diametrically opposite to a reference potential part 2. Then, in the controlling cycle C0 which is continued from the cycle M0, the surface potential of the photosensitive body is changed. Besides, in the next measuring cycle M1, the surface potential of the photosensitive drum is measured like the above described M0. However, the concerned cycle M1 is not overlapped with the preceding controlling cycle C0 and the stable surface potential of the photosensitive drum after the consecutive surface potential control such as the cycle M0 and the cycle C0. By similarly repeating the consecutive measurement and control such as the measuring cycle Mn and the control cycle Cn, the potential Vp of the photosensitive body is controlled so as to be made to coincide with reference potential Vs regardless of the positional relation between the potential sensor 4 and an electrostatic charger 18.

3. 发明专利

JPH0477678A PHOTOSENSITIVE SURFACE POTENTIAL MEASURING DEVICE AND ELECTROSTATIC RECORDER USING IT 失效
公开(公告)号：JPH0477678A
公开(公告)日：1992-03-11
申请号：JP19053190
申请日：1990-07-20
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： NAKAZAWA TAKASHI , OSHIMA MINORU , ISHIKAWA MASAMI , OGAWA TSUKASA , UMEDA TAKAO , MIYASAKA TORU
IPC分类号： G01R29/12 , G01R15/16 , G01R19/00 , G03G15/00 , G03G15/02 , G03G15/05 , G03G15/06 , G03G21/00
摘要： PURPOSE:To measure exact surface potentials by measuring the surface potentials of a plurality of positions of a photosensitive body to eliminate the fluctuation and noise of the surface potentials. CONSTITUTION:A potential sensor 2 is a vibrating reed sensor and outputs an alternating current signal proportional to the magnitude of surface potentials of a photosensitive body drum 1. The alternating current signal becomes a surface potential measured value rectified in a rectification circuit 4 through an amplifier 3. The surface potential of the drum 1 is sampled at intervals of 120 degrees of rotation to hold a sample and hold circuits A1, A2, A3 to add each output of the sample and hold circuits A1, A2, A3 by the use of an adder 6 so as to transmit to a control circuit 8. Various noises are superimposed in addition to the fluctuation due to eccentricity in the output of the potential sensor 2. Such noises can be eliminated if sampling is performed by the frequency of twofold or more of a frequency band of the noises as known in Nyquist theorem.

4. 发明专利

JPH06286242A PRINTING CONTROLLING APPARATUS 失效
公开(公告)号：JPH06286242A
公开(公告)日：1994-10-11
申请号：JP7578393
申请日：1993-04-01
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： FUJI HISAYUKI , FUJISAKI HIROO , ISHIKAWA MASAMI
IPC分类号： B41J13/00 , G06F3/12
摘要： PURPOSE:To shorten the waiting time for exposure when a cut sheet is paginated, by executing a sequence for controlling the feed of papers and a sequence for controlling outputting of printing data in parallel to each other to a plurality of pages to be printed sequentially. CONSTITUTION:When a cut sheet 1 taken out from a hopper 2 is faced to a photosensitive drum 4 at a transfer point Py after passing a predetermined starting position Px where the exposure is started, a toner image formed on the surface of the photosensitive drum 4 is transferred to the surface of the cut sheet. A page is drawn by a laser drawing device 5 to a laser exposure end Pz on the photosensitive drum 4. When the end Pz moves a distance L2 and reaches the transfer point Py in accordance with the rotation of the photosensitive drum, the page is transferred to the cut sheet 1. Then, the transfer image o the cut sheet 1 is thermally fixed when the cut sheet passes a fixing device 6. When only one face of the cut sheet is to be printed, the cut sheet 1 is discharged directly to a stacker 7 as it is. If both faces of the cut sheet are to be printed, the cut sheet 1 is sent to the starting position Px again via a loop back pass 8.

5. 发明专利

JPH0477768A ELECTROSTATIC RECORDER 失效
公开(公告)号：JPH0477768A
公开(公告)日：1992-03-11
申请号：JP19053090
申请日：1990-07-20
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： NAKAZAWA TAKASHI , OSHIMA MINORU , ISHIKAWA MASAMI , OGAWA TSUKASA , UMEDA TAKAO , MIYASAKA TORU
IPC分类号： G03G15/02 , G03G15/00
摘要： PURPOSE:To correct the measured error of potential caused by mechanical level difference between a photosensitive body and a reference potential part and to accurately control the potential of the photosensitive body by providing a circuit which generates the correcting amount of an error and an addition circuit and obtaining such constitution that an error correction signal is added and subtracted to and from a potential detection signal on the circuit. CONSTITUTION:Since the reference potential part 2 and the photosensitive body 3 are discontinuous, the level difference G is generated. A correction circuit consists of an adder 11 being an addition means and a switch 22 being a correction signal generation means. Then, a binary value ds-dse in proportion to a detection error Es-Ese by the level difference G shown by a signal (j) is previously set by the switch and added to binary data des-dp for adding by the adder. The added result becomes the binary value ds-dp in proportion to the difference of the potential Vs-VP like a signal (k) and the effect of the level difference G is corrected.

6. 发明专利

JPH0477769A PHOTOSENSITIVE DRUM SURFACE POTENTIAL CONTROLLER FOR ELECTROSTATIC RECORDER 失效
公开(公告)号：JPH0477769A
公开(公告)日：1992-03-11
申请号：JP19053390
申请日：1990-07-20
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： NAKAZAWA TAKASHI , OSHIMA MINORU , ISHIKAWA MASAMI , OGAWA TSUKASA , UMEDA TAKAO , MIYASAKA TORU
IPC分类号： G03G15/02 , G03G15/00 , G03G21/00
摘要： PURPOSE:To fix the potential of the photosensitive body of a photosensitive drum to a reference and to prevent the sensitivity of printing from being changed by electrostatically charging a reference potential part and the photosensitive body with the aid of impressing an initial voltage on an electrostatic charger at the time of starting and controlling them with the aid of negatively feeding back the difference of potential between the potential of the photosenhsitive body and a reference potential after the starting. CONSTITUTION:A timing circuit 19 generates timing signals (b) and (c) detected by a position sensor 18 and a potential measurement part 5 generates a difference signal (e) between respective analog signals in the respective timing signals by making the above signals (b) and (c) a trigger. A next AD-IF part 6 and an AD converter 7 convert the above described (e) to an offset-binary digital signal (f). An adder 9 outputs the sum (h) of a digital difference signal (g) extracted by a data conversion part 8 and the control signal (j) of a grid power source 13. A selector 10 switches and outputs the above described (h) and the initial value data Go of an initial value circuit 11. By the above described actions, a voltage corresponding to the initial value data Go is impressed on the grid 15 of the electrostatic charger 17 at the time of starting and the voltage corresponding to the above described (h) is updated every one rotation of the photosensitive drum 1 and impressed thereafter.

7. 发明专利

JP2000267466A CLEANER FOR AUXILIARY TRANSFER-PLATE IN IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000267466A
公开(公告)日：2000-09-29
申请号：JP7584999
申请日：1999-03-19
申请人： HITACHI KOKI KK
发明人： IKEDA YOSHIMITSU , ISHIKAWA MASAMI , SANO YOSHIHIKO , KOBASHI SADANORI
IPC分类号： G03G21/00 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To lighten and reduce maintenance work and also to prevent a cleaning member from being overdriven and causing imperfect cleaning, by controlling the drive of the cleaning member for an auxiliary transfer-plate based on the drive current and drive time of a driving device. SOLUTION: A cleaning mechanism for an auxiliary transfer-plate 1 is composed of a cleaning member 2, a motor 4 for driving the cleaning member 2, and a spiral shaft 3 connected to the motor 4. Normally, the cleaning member 2 is in an initial position. However, taking account of the case in which a power source is turned off during an operation, or the like, a monitor timer is started first and the motor 4 is CCW driven to perform the operation of returning it to the initial position. At the time, in the DC motor 4 or the like, a start current which is generally equal in current value to a lock current flows for a moment. When the time needed to detect the lock current is short, the start current is erroneously recognized as the lock current, therefore it is necessary that the time needed to detect the lock current be taken sufficiently longer than the time during which the start current flows. In the case the lock current is detected, the device recognizes that it reaches the opposite side.

8. 发明专利

JPH08238816A DETECTION AND CONTROL METHOD FOR RESIDUAL PAPER IN CUT PAPER PRINTING APPARATUS 失效
公开(公告)号：JPH08238816A
公开(公告)日：1996-09-17
申请号：JP4395795
申请日：1995-03-03
申请人： HITACHI KOKI KK
发明人： NAGASU TAKASHI , ISHIKAWA MASAMI , TSUCHIYA KIYOMI , KIYONO MINORU , KAWASAKI KAZUHIKO
IPC分类号： B41J11/42 , B41J13/00 , B65H7/02
摘要： PURPOSE: To materialize a detection and control method for residual paper in a cut paper printing apparatus which can detect residual paper in a place where no paper detection sensor is placed without increasing the number of the sensors. CONSTITUTION: In advance of printing work, transportation devices 8, 22, 24, 26 are operated for a specified period of time. When paper is in such a place that paper detection sensors 17, 18, 19, 20, 21 can not detect the paper, the paper is transported to the place of the sensor.

9. 发明专利

JPH06347710A OPTICAL UNIT FOR ELECTROPHOTOGRAPHIC PRINTING DEVICE 失效
公开(公告)号：JPH06347710A
公开(公告)日：1994-12-22
申请号：JP13483193
申请日：1993-06-04
申请人： HITACHI KOKI KK
发明人： NAGURA MAKOTO , ISHIKAWA MASAMI , KIYONO MINORU
IPC分类号： B41J2/44 , G02B26/10 , G02B26/12 , G03G15/04
摘要： PURPOSE:To form a high-definition latent image, to facilitate the optimized design of an image-formation lens system, and to facilitate the adjustment of the lens system in an optical unit for an electrophotographic printing device using plural beams. CONSTITUTION:The respective laser beams 5 and 6 emitted from lasers 1 and 2 are made incident on a scanner 9 so that the difference of an incident angle viewed from the rotary shaft direction of the scanner 9 may be within 5 degrees. Only one scanning laser beam 13 is made incident on a beam detector 12, and writing 17 and 18 by the 1st and the 2nd scanning laser beams 13 and 14 is performed by an independent modulator with an output signal from the detector 12 as a trigger.

10. 发明专利

JPH0624618A PAPER REVERSING DEVICE OF CUT SHEET PRINTER 失效
公开(公告)号：JPH0624618A
公开(公告)日：1994-02-01
申请号：JP18348192
申请日：1992-07-10
申请人： HITACHI KOKI KK
发明人： OGAWA TSUKASA , KOSEKI MASAAKI , EBIHARA TAKASHI , NAGASU TAKASHI , SHIMOHORI MASAHIRO , TSUCHIYA KIYOMI , ISHIKAWA MASAMI , GUNJI YOSHINOBU
IPC分类号： B41J13/00 , B65H15/00 , B65H29/58
摘要： PURPOSE:To carry and judge all sizes of paper always stably by installing two pairs of rollers, which sandwich and carry paper each, and two pairs of reverse rollers, and sandwiching paper two pairs of rollers at all times out of these and carrying and reversing the paper. CONSTITUTION:When a changeover lever 44 is changed over with a pass changeover motor 43, the paper carried with a pair of rollers 41 has its paper pass changed over, and is sandwiched with a pair of reverse rollers 48. At this time, two pairs of reverse rollers 48 and 49 are driven each by a paper carry motor 47 through a belt 50. The paper carry motor 47 starts the driving in the specified direction when the top of the paper passes a sensor 45. Moreover, the paper is sandwiched with a pair of rollers 49 when it is released of the sandwiching by the rollers 41. Furthermore, the stoppage of the paper carry motor 47 starts when the end of the paper passes the sensor 45. On the other hand, the top of the paper released of the sandwiching by the rollers 49 is sandwiched with a pair of rollers 42.

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