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1. 发明专利

JPS54116269A LEVEL DETECTOR FOR POWDER AND GRANULAR MATERIALS 失效
公开(公告)号：JPS54116269A
公开(公告)日：1979-09-10
申请号：JP2204878
申请日：1978-03-01
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KOMATSU ISAMU , ANZAI MASAYASU
IPC分类号： G01F23/22
摘要： PURPOSE:To achieve the prevention of deposition of powder and granular materials on a level detecting vibrator and enable the detector to operate surely even for powder and granular materials of high cohesive and adhesive forces by forcefully vibrating the vibrator such as tuning fork, tuning bar of the like with natural frequency. CONSTITUTION:When the output voltage of an oscillating circuit 4 generating voltage at the frequency nearly equal to the natural frequency of a tuning bar 1 is applied to an electrostrictive vibrating element 3a, the tuning bar 1 is forcefully vibrated by the natural frequency and this causes the electrostrictive vibrating element 3b to generate an electric signal. After this signal is amplified with an amplifier 5, it is converted to an arbitrary signal in a signal processing circuit 6. Now, when powder or granular material touches the tuning bar 1 and restrains the same, the vibrations of the tuning bar 1 attenuate or stop, but when there is no more powder or granular material, the tuning bar 1 again begins to make separate excitation vibration. This enables the level of the one restraining the vibration of the tuning bar 1 to be detected by the output voltage of the amplifier 5 and the powder or granular material depositing on the tuning bar 1 to be readily shaken off by the forceful separate excitation vibration of the tuning bar 1, thus making possible the sure level detection.

2. 发明专利

JPH02139583A ELECTROSTATIC RECORDER, ITS CONTROL METHOD AND EVALUATION OF SERVICE LIFE OF ELECTROSTATIC RECORDING PHOTOSENSITIVE BODY 失效
公开(公告)号：JPH02139583A
公开(公告)日：1990-05-29
申请号：JP30684488
申请日：1988-12-06
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： UMEDA TAKAO , MIYASAKA TORU , NAMIKAWA OSAMU , KOMATSU ISAMU
IPC分类号： G03G15/00 , G03G15/02 , G03G21/00
摘要： PURPOSE:To achieve a highly accurate surface potential control, the service life evalua tion of a photosensitive body, picture quality control and the fault diagnosis of a recorder by forming a reference potential part possessing a prescribed potential in a part of a photosensitive body and comparing the part with the surface potential of a charge receiving part and thereby evaluating the potential. CONSTITUTION:A part of a photosensitive sheet 4 is wound on a drum tube 3 from a stock roll 1 after it has passed through the opening part 5 of the drum tube 3, and again wound on a takeup roll 2. The opening part 5 is covered with a cap 6, its potential is Vs, which is taken for the reference potential part. While a drum rotates, an electrifier 8 is controlled so that an output from a surface potential detecting means 7 becomes equal to the Vs. Consequently, the surface potential of the photosensitive body can be controlled to an appropriate value. Irregularity in the surface potential distribution, which is caused by deterioration, is compared with a reference value, whereby the service life of the photosensitive body can be evaluated. The title recorder can be systematized interactively in combination with an information processor, and can perform self-fault diagnosis.

3. 发明专利

JPS6432276A NON-CONTACT DEVELOPING METHOD 失效
公开(公告)号：JPS6432276A
公开(公告)日：1989-02-02
申请号：JP18759787
申请日：1987-07-29
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KUMASAKA TAKAO , SHIMAZAKI YUZURU , FUJIWARA SHIGETAKA , MITSUYA TERUAKI , KOMATSU ISAMU
IPC分类号： G03G15/09
摘要： PURPOSE:To enlarge a control plate gap and to prevent a developer from clogging by setting a pitch of magnetic poles to 4-11mm, at the time of providing a magnetic roller having a pair of magnetic poles of the N pole and the S pole, and a non-magnetic sleeve for covering said roller, in the vicinity of a photosensitive body on which an electrostatic latent image has been formed. CONSTITUTION:On a photosensitive body 1 on which an electrostatic latent image is formed, a magnet roller 3 surrounded by a non-magnetic sleeve 2 is provided through a control plate 4 having an opening part, and in the rear of this roller 3, a stirring member 7 for mixing a carrier and a toner of a developer is provided. These are surrounded by a case connected to the control plate 4, and in addition to the foregoing, a scraping plate 6, a toner replenishing roller 10, and a toner hopper 11 are provided in the case. Also, to the sleeve 2, a power source 5 is connected, and a magnetic brush tuft 8 is generated on the surface of the sleeve 2. In such constitution, a pitch of the magnetic poles of N and S provided on the roller 3 is prescribed to 4-11mm, and the opening of the control plate 4 can be enlarged.

4. 发明专利

JPS569771A MAGNETIC BRUSH DEVELOPING DEVICE 失效
公开(公告)号：JPS569771A
公开(公告)日：1981-01-31
申请号：JP8474879
申请日：1979-07-03
申请人： HITACHI LTD , HITACHI KOKI KK , NIPPON TELEGRAPH & TELEPHONE
发明人： KOMATSU ISAMU , ANZAI MASAYASU , SAWADA HIROTSUGU , NIINUMA KIYOSHI , FUJIMOTO ISAO , NISHIMURA KUNITOSHI
IPC分类号： G03G15/08 , G03G15/09
摘要： PURPOSE:To prevent the leakage of the developer and make possible the perfect discharging of the deteriorated developer by controlling the developer passage between the spacially installed magnetic rolls for conveying developer and for forming magnetic brush by way of a freely turnable conveying member. CONSTITUTION:A predetermined amount of the developer which is uniformly stirred and mixed and is flowed down by an outflow rate control member 18 is conveyed along a non-magnetic sleeve 11 turnfing around the outside circumference of a stationary magnetic roller 10 and is pushed upward along a conveying member 9 after it has passed the conveying magnetic pole 10a. This causes the magnetic brush of the height corresponding to a shaping member 20 to be formed by the nonmagnetic sleeve 13 turning around the outside circumference of a magnetic roller 6 for forming magnetic brush intalled spacially from the roller 10, whereby a photosensitive drum 21 is subjected to development. Thence, the 2nd developing is accomplished by a similar roller 7, etc. On the other hand, if the member 9 is turned and a discharge port 3 is opened, the developer conveyed by the roller 10 is discharged, thus the leakage of the developer is perfectly prevented at the developing and the perfect discharging of the deteriorated developer may be done.

5. 发明专利

JPS561075A DEPOSITED CARRIER REMOVER 失效
公开(公告)号：JPS561075A
公开(公告)日：1981-01-08
申请号：JP7569779
申请日：1979-06-18
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KOMATSU ISAMU , ANZAI MASAYASU
IPC分类号： G03G15/16 , G03G15/09 , G03G21/00 , G03G21/10
摘要： PURPOSE:To efficiently remove deposited carrier without being affected by the magnetic permeability of the carrier by forming a slender opening which sucks air at the end of the opposing magnetic poles, approaching the end thereof to a recording body and making combination use of magnetic force and suction force. CONSTITUTION:The device is made into the constitution comprising forming a slender opening 6 composed of opposing magnetic pole ends by the respective one ends of magnetic material members 7, 7', closely fitting a nonmagnetic material member 8 to the other ends of these two magnetic material members, inscribing and installing a rotatable bar-form magnet 9 to both magnetic material members 7, 7' and sucking air from one end of a long barrel in the arrow direction at all times. The slender opening 6 is installed in proximity to the surface of the recording body 1 having the toner images and before the toner images are transferred to the recording paper. Thereby, the magnetic force attraction force that affects the deposited magnetic carrier becomes stronger, the removal efficiency may be improved and even the foreign matter, etc. of weak magnetism may be removed because the suction force of air is used in combination.

6. 发明专利

JPS54109867A POWDER AND GRANULE LEVEL DETECTOR 失效
公开(公告)号：JPS54109867A
公开(公告)日：1979-08-28
申请号：JP1650578
申请日：1978-02-17
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KOMATSU ISAMU , ANZAI MASAYASU
IPC分类号： G01F23/22
摘要： PURPOSE:To prevent deposition of powder and granules on electrode bodies and accurately perform detection of powder and granule levels by forcefully exciting the electrode bodies forming a level detecting element. CONSTITUTION:The electrostatic capacity between plate form conductors 1a, 1b changes according to the levels of powder and granules when their dielectric constants are constant. This change causes the output frequency of an oscillator 2 to change and the output voltage corresponding to the input frequency of a frequency voltage converter 3 decreases as the level of the powder and granules lowers and the capacity between the conductors 1a, 1b decreases, whereby the levels of the powder and granule are detected. In this case, magnetostrictive vibrating elements 4a, 4b are driven to forcefully vibrate the conductors 1a, 1b by turning ON a changeover switch 6, whereby deposition of the powder on the conductors is prevented, the powder bridging between the conductors 1a, 1b eliminated and the level detection of the powder and granules made sure.

7. 发明专利

JPH03121479A DEVELOPING METHOD OR MEASURING METHOD FOR DEVELOPING NAPPING HEIGHT, DEVICE FOR EXECUTING THESE METHODS AND COLOR IMAGE PRINTER 失效
公开(公告)号：JPH03121479A
公开(公告)日：1991-05-23
申请号：JP6691190
申请日：1990-03-19
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KUMASAKA TAKAO , SHIMAZAKI YUZURU , FUJIWARA SHIGETAKA , KOMATSU ISAMU , HIROSE YOJI
IPC分类号： G03G15/09
摘要： PURPOSE:To prevent the scraping of previously formed toner images and the consequent degradation in the image density by nearly equaling the napping height of a magnetic brush and a developing gap. CONSTITUTION:The developing gap G and the napping height (h) of the magnetic brush are so relatively adjusted as to nearly equal the value G of the developing gap defined by the gap between the surfaces of a photosensitive drum 1 and a developing sleeve 2 and the napping height (h) of the magnetic brush 4c formed by a developer 4 in the developing gap. The development of the latent image formed on the surface of the photosensitive drum 1 is executed by impressing the bias voltage between the photosensitive drum 1 and the developing sleeve 2. The front end of the magnetic brush 4c, therefore, lightly rubs the surface of a developer carrying member 1 and develops the 2nd latent image, thereby forming the 2nd toner image. The scraping of the previously formed 1st toner image and the consequent degradation in the image density are obviated in this way.

8. 发明专利

JPH01255876A DEVELOPING DEVICE 失效
公开(公告)号：JPH01255876A
公开(公告)日：1989-10-12
申请号：JP8297988
申请日：1988-04-06
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： SHIMAZAKI YUZURU , KUMASAKA TAKAO , KOMATSU ISAMU
IPC分类号： G03G15/09 , G03G15/08
摘要： PURPOSE:To enable applying a sufficiently high bias voltage obstructing a flow of a developer by placing an electrode on the inside surface of a developer containing part opposed to the magnetic pole of a magnetic roller. CONSTITUTION:In a two-component developing device, an electrode 24 placed so as to be opposed to a partial magnet body 30 of a developing roller 21 is structured so as to be arranged on the inside surface of a developer containing box 20 consisting of an insulator. In such a way, there is no obstacle and the flow of a developer in the vicinity of the electrode 24 is not obstructed, and a uniform toner concentration can be maintained by a stirring machine 22. Also, since a distance between a rotary sleeve 26 and the electrode 24 can be taken enough, an image having a sufficient toner density is obtained from the points that a sufficient bias voltage can be applied, etc.

9. 发明专利

JPS649477A DEVELOPING DEVICE 失效
公开(公告)号：JPS649477A
公开(公告)日：1989-01-12
申请号：JP16229487
申请日：1987-07-01
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KUMASAKA TAKAO , MITSUYA TERUAKI , KOMATSU ISAMU , FUJIWARA SHIGETAKA
IPC分类号： G03G15/06 , G03G15/08
摘要： PURPOSE:To prevent the generation of uneven density on a printed image by providing a developing device with a deformation sensor for detecting the change of a gap between the surface of a photosensitive body and a developing sleeve and adjusting a bias voltage to be impressed to the sleeve in accordance with the change of the gap. CONSTITUTION:A developer 7 is applied on the developing sleeve 2, a bias voltage is impressed to the sleeve 2, its toner is dispersed and transferred to an electrostatic latent image on a drum 1, and an image is formed on the surface of the rotating drum 1. The deformation sensor 8 detects the deformation of the surface position of the rotating drum 1 due to eccentricity generated during the rotation of the drum 1 in the vicinity of a developing device 9 and applies the detecting signal to a bias power supply 4. The power supply 4 adjusts an output voltage based on an output signal from the sensor 8, and even if a deviation due to eccentricity is generated during the rotation of the drum 1 and the developing gap is changed from the prescribed value, prescribed developing density can be obtained. Thus, the generation of uneven density on the printed image can be prevented.

10. 发明专利

JPS569772A MAGNETIC BRUSH DEVELOPING DEVICE 失效
公开(公告)号：JPS569772A
公开(公告)日：1981-01-31
申请号：JP8475079
申请日：1979-07-03
申请人： HITACHI LTD , HITACHI KOKI KK , NIPPON TELEGRAPH & TELEPHONE
发明人： KOMATSU ISAMU , ANZAI MASAYASU , SAWADA HIROTSUGU , NIINUMA KIYOSHI , FUJIMOTO ISAO , NISHIMURA KUNITOSHI
IPC分类号： G03G15/09
摘要： PURPOSE:To achieve the reduction in weight of a developing device by adding devices to the constitution of the device thereby decreasing the temperature rise of the developer and make the fluidity of the developer stable and good. CONSTITUTION:A fixed amount of the developer mixed in a developer mixing part 2 is well dropped down and flowed out by a developer feeder 21, etc. and an outflow control member 6 of an opening 5 having a fall in position relation by a tapered face and is conveyed by a magnetic roller 10 for conveying developer. The developer is forced upward by the conveying member 13 formed by the tapered plate between this 10 and a magnetic roller 7 for development installed diagonally above, thus the development of a photosensitive drum 15 by the magnetic brush of the roll 7 is accomplished. Thence, the development by a similar magnetic roller 16 is accomplished. The excess developer is returned to the mixing part. With this constitution, the flow of the developer becomes uniform and fixed; in addition, the circumferential distance of the sleeve of the roll 10 may be reduced by the spaced rolls 7, 10 and this results in decreased temperature rise of the developer. Hence, the developing device of stable and good fluidity of the developer, a small size and light weightness is provided.

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