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1. 发明专利

DE3903586C2 未知
公开(公告)号：DE3903586C2
公开(公告)日：1995-02-09
申请号：DE3903586
申请日：1989-02-07
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： ARIMOTO AKIRA , SAITO SUSUMU , TSUJI YASUYUKI , NAMIKAWA OSAMU , MOCHIZUKI TAKESHI
IPC分类号： B41J2/44 , G06K15/12 , B41J2/455 , H01S3/10 , G05D25/00
摘要： Electric-photosensitive printing is accomplished with an LD providing a laser scanning beam that is modulated to affect printing, and the power output of the LED is maintained constant through negative feedback by a holding voltage provided by a capacitor having its charge determined only during a non-printing portion of the printing period wherein a plurality of sheets are printed. During the non-printing period, contact of the scanning laser beam with the electro-photosensitive material is disabled while the laser beam is maintained on so that its power may be measured and compared with a reference level to provide a feedback signal for controlling the output of the laser beam, particularly the feedback signal being provided to the holding capacitor only during the non-printing portion of the period, and the holding capacitor being isolated from the feedback signal during the printing portion of the period. As a specific embodiment, a rectangular sheet of electric-photosensitive material is replaceable wound around a drum so that its opposite ends are spaced apart to provide a seam to affect the disablement of the laser beam from contracting the electro-photosensitive material during the non-printing portion of the period, and a separate light source used to detect this seam portion to determine the non-printing portion of the period.

2. 发明专利

DE68913480T2 未知
公开(公告)号：DE68913480T2
公开(公告)日：1994-06-09
申请号：DE68913480
申请日：1989-12-18
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MATSUNO JUNICHI , OGASAWARA TSUYOSHI , KAWAUCHI MASATAKA , TSUJI YASUYUKI
IPC分类号： B41J13/00 , B65H5/06 , B65H9/06 , G03G15/00 , G03G15/16
摘要： A printer comprises a transfer apparatus (10) for transferring a toner image to paper (1), a paper end positioning member (4) for temporarily stopping the paper carried, a carrying apparatus (2, 3, 5) for carrying the paper to a transfer portion after the paper end positioning member (4) is released, and an apparatus for controlling print positioning which comprises a detector (6, 22) for detecting time which elapses until paper reaches a given position, a calculator (23) for calculating a time delay in the carrying of the paper relative to a set time on the basis of an output signal from the detector (6, 22), and a controller (24, 25) for controlling a carrying speed of the carrying apparatus (2, 3, 5) on the basis of an output signal from the calculator (24, 25).

3. 发明专利

DE3926636A1 未知
公开(公告)号：DE3926636A1
公开(公告)日：1990-02-15
申请号：DE3926636
申请日：1989-08-11
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： SAITO SUSUMU , ARIMOTO AKIRA , MOCHIZUKI TAKESHI , TSUJI YASUYUKI , OHSHIMA MINORU , SEINO MINORU
IPC分类号： B41J2/47 , G02B26/12 , H04N1/04 , H04N1/113 , H04N1/19
摘要： A scanning apparatus for use in a laser beam printer or the like comprising a control means for varying the spacing between adjoining scanning beams of a plurality of laser beams, which further comprises a plurality of light sources, a means for changing intensity, including on/off states, of the beam from the light sources, and a rotating polygonal mirror for allowing the beams to scan the scanned plane in parallel, and is adapted, in accordance with the value of the pixel density of information to be recorded, such that, in the beam scanning direction, the area exposed to the beam is changed by changing the width of a beam intensity modulating pulse, and in the direction perpendicular to the beam scanning, the number of revolutions of the rotating polygonal mirror is changed.

4. 发明专利

DE3903586A1 未知
公开(公告)号：DE3903586A1
公开(公告)日：1989-08-17
申请号：DE3903586
申请日：1989-02-07
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： ARIMOTO AKIRA , SAITO SUSUMU , TSUJI YASUYUKI , NAMIKAWA OSAMU , MOCHIZUKI TAKESHI
IPC分类号： B41J2/44 , G06K15/12
摘要： Electric-photosensitive printing is accomplished with an LD providing a laser scanning beam that is modulated to affect printing, and the power output of the LED is maintained constant through negative feedback by a holding voltage provided by a capacitor having its charge determined only during a non-printing portion of the printing period wherein a plurality of sheets are printed. During the non-printing period, contact of the scanning laser beam with the electro-photosensitive material is disabled while the laser beam is maintained on so that its power may be measured and compared with a reference level to provide a feedback signal for controlling the output of the laser beam, particularly the feedback signal being provided to the holding capacitor only during the non-printing portion of the period, and the holding capacitor being isolated from the feedback signal during the printing portion of the period. As a specific embodiment, a rectangular sheet of electric-photosensitive material is replaceable wound around a drum so that its opposite ends are spaced apart to provide a seam to affect the disablement of the laser beam from contracting the electro-photosensitive material during the non-printing portion of the period, and a separate light source used to detect this seam portion to determine the non-printing portion of the period.

5. 发明专利

DE19700396A1 Continuous paper feed for electrophotographic printer 未知
公开(公告)号：DE19700396A1
公开(公告)日：1997-07-10
申请号：DE19700396
申请日：1997-01-08
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： OHTSUKA HIDEFUMI , OBATA SHIGERU , MATSUNO JUNICHI , TSUJI YASUYUKI , YOKOKAWA SHUHO , NAKAJIMA ISAO , AKAI MUNEYOSHI , HIROSE YOJI
IPC分类号： B65H23/02 , B65H23/038 , G03G15/00
摘要： The feed mechanism (100) holds the paper between rollers and moves it by friction. It can therefore be used whether or not the paper has a perforated edge. The system includes linear sensors (43, 44) which monitor the edge of the paper. They emit a signal to an electronic control operating a corrector unit (37-56). It adjusts the feed by oblique compensation, if necessary, to provide accurate presentation of the paper to the carrying section (412, 502, 504) where it meets the printing drum (402). Two edge-rollers (506) at each side of the paper maintain its exact position on the bearing roller (508) during and after printing. Precise and reliable registration of the print on the paper is thus ensured.

6. 发明专利

DE68923136T2 未知
公开(公告)号：DE68923136T2
公开(公告)日：1995-11-30
申请号：DE68923136
申请日：1989-08-21
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MATSUNO JUNICHI , OGASAWARA TSUYOSHI , KAWAUCHI MASATAKA , KOBAYASHI TSUNEKI , TSUJI YASUYUKI
IPC分类号： B65H9/00 , B41J13/32 , B65H9/06 , B65H9/14 , B65H9/16
摘要： To adjust the posture of a sheet (2; 102) being conveyed, movable checker members (21, 22; 121, 122, 123) provided adjacent to the conveyance path for the sheet are once driven in the direction of conveyance of the sheet before the members touch the sheet (2; 102) and are subsequently decelerated, the members being caused to abut against the front end of the sheet during the deceleration, thereby checking the sheet and thus correcting any skew thereof. Further, for positioning the sides of the sheet (102), the sheet is taken out of a hopper (116) by means of a separating device (15) and is guided and fed in such a manner that its front corner will not be caused to abut against a side registration guide (160), and subsequently the sheet is conveyed toward the guide (160) by means of obliquely extending conveyer belt devices (150) and one side of the sheet is brought into contact with the guide for positioning after a front corner of the sheet (102) has passed at least the edge of the guide (160).

7. 发明专利

DE68923136D1 未知
公开(公告)号：DE68923136D1
公开(公告)日：1995-07-27
申请号：DE68923136
申请日：1989-08-21
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MATSUNO JUNICHI , OGASAWARA TSUYOSHI , KAWAUCHI MASATAKA , KOBAYASHI TSUNEKI , TSUJI YASUYUKI
IPC分类号： B65H9/00 , B41J13/32 , B65H9/06 , B65H9/14 , B65H9/16
摘要： To adjust the posture of a sheet (2; 102) being conveyed, movable checker members (21, 22; 121, 122, 123) provided adjacent to the conveyance path for the sheet are once driven in the direction of conveyance of the sheet before the members touch the sheet (2; 102) and are subsequently decelerated, the members being caused to abut against the front end of the sheet during the deceleration, thereby checking the sheet and thus correcting any skew thereof. Further, for positioning the sides of the sheet (102), the sheet is taken out of a hopper (116) by means of a separating device (15) and is guided and fed in such a manner that its front corner will not be caused to abut against a side registration guide (160), and subsequently the sheet is conveyed toward the guide (160) by means of obliquely extending conveyer belt devices (150) and one side of the sheet is brought into contact with the guide for positioning after a front corner of the sheet (102) has passed at least the edge of the guide (160).

8. 发明专利

DE68913480D1 未知
公开(公告)号：DE68913480D1
公开(公告)日：1994-04-07
申请号：DE68913480
申请日：1989-12-18
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MATSUNO JUNICHI , OGASAWARA TSUYOSHI , KAWAUCHI MASATAKA , TSUJI YASUYUKI
IPC分类号： B41J13/00 , B65H5/06 , B65H9/06 , G03G15/00 , G03G15/16
摘要： A printer comprises a transfer apparatus (10) for transferring a toner image to paper (1), a paper end positioning member (4) for temporarily stopping the paper carried, a carrying apparatus (2, 3, 5) for carrying the paper to a transfer portion after the paper end positioning member (4) is released, and an apparatus for controlling print positioning which comprises a detector (6, 22) for detecting time which elapses until paper reaches a given position, a calculator (23) for calculating a time delay in the carrying of the paper relative to a set time on the basis of an output signal from the detector (6, 22), and a controller (24, 25) for controlling a carrying speed of the carrying apparatus (2, 3, 5) on the basis of an output signal from the calculator (24, 25).

9. 发明专利

DE4400103A1 未知
公开(公告)号：DE4400103A1
公开(公告)日：1994-07-07
申请号：DE4400103
申请日：1994-01-04
申请人： HITACHI KOKI KK
发明人： YAMADA KOUTARO , TSUJI YASUYUKI , ANZAI MASAYASU , HIROSE YOUJI , OTOME YUKIO , DOI KOJI , TAKEUCHI YOUICHI , YAMAKI MASAMI , SUZUKI KATSUHIKO , TAKIZAWA AKIRA
IPC分类号： G03G15/08 , G03G15/09
摘要： In a multi-stage roll magnetic brush type of developing device, at least two opposite direction rotation rolls which rotate in an opposite rotation direction to that of a photosensitive body are arranged adjacently and oppositely to a photosensitive body, and at least one same direction rotation developing roll which rotates in the same rotation direction as that of the photosensitive body is arranged adjacently, oppositely to the photosensitive body and upstream of the opposite direction rotation developing rolls in the rotation direction of the photosensitive body. Thus, the path of carrying the developer by the same direction rotation developing roll and the opposite direction rotation developing rolls can be optimized. In the wide area printing at high speed, an image with stabilized printing quality can be obtained without an increase in the production cost.

10. 发明专利

DE3717372A1 未知
公开(公告)号：DE3717372A1
公开(公告)日：1987-11-26
申请号：DE3717372
申请日：1987-05-22
申请人： HITACHI KOKI KK
发明人： TSUJI YASUYUKI , TERAKADO AKIRA
IPC分类号： B41J2/44 , B65H5/26 , G03G15/00 , G03G15/04 , G03G15/23 , H04N1/04 , B41J3/21
摘要： Cut paper electrophotographic printers with continuous paper feed mechanisms including a pickup roll, a photosensitive drum, a charging unit, an optical unit, a host controller, a developing unit, a transfer unit and fixing rolls. Further included are first and second branch passages for providing alternate feeding paths to continuously feed cut paper sheets to the photosensitive drum.

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