EP0409184B1 - Système de traitement d'images - Google Patents

Système de traitement d'images Download PDF

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Publication number
EP0409184B1
EP0409184B1 EP19900113705 EP90113705A EP0409184B1 EP 0409184 B1 EP0409184 B1 EP 0409184B1 EP 19900113705 EP19900113705 EP 19900113705 EP 90113705 A EP90113705 A EP 90113705A EP 0409184 B1 EP0409184 B1 EP 0409184B1
Authority
EP
European Patent Office
Prior art keywords
photosensitive body
surface speed
image processing
fatigue process
processing equipment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19900113705
Other languages
German (de)
English (en)
Other versions
EP0409184A2 (fr
EP0409184A3 (en
Inventor
Nariaki Tanaka
Takeshi Yosida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Mita Industrial Co Ltd
Original Assignee
Mita Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1185801A external-priority patent/JPH0350587A/ja
Priority claimed from JP1226552A external-priority patent/JPH0389291A/ja
Application filed by Mita Industrial Co Ltd filed Critical Mita Industrial Co Ltd
Publication of EP0409184A2 publication Critical patent/EP0409184A2/fr
Publication of EP0409184A3 publication Critical patent/EP0409184A3/en
Application granted granted Critical
Publication of EP0409184B1 publication Critical patent/EP0409184B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/0094—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge fatigue treatment of the photoconductor

Definitions

  • This invention relates to a method and an apparatus for executing a pre-fatigue process in an electrostatic image processing equipment such as, for instance, a copying machine.
  • Pre-copying process or "Pre-fatigue process”
  • pre-fatigue process is an excellent technique in the point of attempting to stabilize the charging capacity at the point when an actual image processing starts.
  • pre-fatigue process is conducted prior to starting the image processing action, it is general that the pre-fatigue process is carried out on starting the main motor to drive a drum, etc. in order to shorten the time of the first copy.
  • the high potential portion can not be sufficiently lowered to such a level as not to be developed even though an exposure process is subsequently executed, thereby causing toner to be adhered to be like a band when the high potential portion passes through the developing portion.
  • Such a toner image is just like so-called black solid and a great deal of toner is adhered. Therefore, when the high potential portion passes through a cleaning device, a cleaning blade thereof may be damaged, and a cleaning trouble may occur. This is because a toner image of black solid as shown above exceeds the allowance capacity of scraping by the cleaning blade. Besides, as a great deal of toner is discharged from the developing device as shown above, there is another problem that the toner consumption is large, too.
  • toner may be directly adhered to the transcribing charger, and there causes another problem that the transcribing charger is much stained.
  • JP-A-63-19 11 67 discloses the compensation of fatigue in a copying process.
  • the degree of fatigue in a copying device is determined for controlling the electrostatic charge current of an electrostatic charge electrode. The control is performed in response to the speed of the photosensitive drum. However, this control is performed during a copying procedure to compensate for a fatigue of the photosensitive body.
  • US-A-4 621 920 describes a preconditioning method for a rotating photosensitive recording drum of a copying machine, comprising the consecutive steps of erasing uniformly a full copying portion of said photosensitive drum by energizing an erase lamp; charging uniformly a full copying portion of said photosensitive drum, and energizing a prefatigue lamp to expose uniformly a full copying portion of said photosensitive drum to infrared and visible rays, all said steps being performed prior to recording of an image on said photosensitive drum and erasing and charging said drum for said recording.
  • this document merely discloses to start energizing this lamp when a portion of the drum which has been charged by a charge corotron is immediately below the prefatigue lamp, and to terminate the energization of the prefatigue lamp when the drum has completed one revolution.
  • US-A-4 797 707 likewise discloses a prefatigue treatment.
  • the prerotation for subjecting a photosensitive member to the fatigue treatment in advance is regulated in accordance with both the rest time after the completion of a previously executed copying operation and the current temperature of the photosensitive member.
  • the invention provides a method as defined in claim 1 and an image processing equipment as defined in claim 4.
  • the pre-fatigue process is started after the peripheral speed of the photosensitive body has reached a constant value and the potential given to the surface of the photosensitive body by a charger is made equivalent to that on usual copying processing and is such a potential as can be sufficiently eliminated in a subsequent static eliminating process. Therefore, such problems as toner may be consumed more than the necessity, defective cleaning may occur, the cleaning blade may be damaged or furthermore the transcribing charger is stained, can be prevented.
  • the photosensitive body can be freed from any breakage of insulation thereof because only a voltage within the permissible range thereof is given thereto.
  • the impression current upon the corona discharger is changed in conformity with the changes of the measured surface speed of the photosensitive body.
  • Various means are considered as means for changing the impression current according to the changes of the peripheral speed of the photosensitive body. For instance, there are means for impressing the corona current according to the speed by detecting the surface speed of the photosensitive body or a motor to drive it.
  • the potential given upon the surface of the photosensitive body is made equivalent to that on usual copying processing and can be sufficiently eliminated in the static eliminating process of usual light energy, which is installed up to the subsequent developing portion. Therefore, such problems as toner may be consumed more than the necessity, defective cleaning may occur, the cleaning blade may be damaged or furthermore the transcribing charger is stained, can be prevented.
  • the photosensitive body can be freed from any breakage of insulation thereof because only a voltage within the permissible range thereof is given thereto.
  • the image processing equipment according to the first embodiment of the invention has almost no change in the hardware thereof from a conventional general copying machine described for instance in the JP-A-60-241080 as shown in Fig. 1.
  • a copy button 2 is connected to the input section of a micro computer 1 which can control the whole system of a copying machine, together with many of switches installed at the operation section.
  • 3 is a timer which is actuated by a clock for determining the cycle of control of the above micro computer 1. The timer 3 is set and reset by commands which come from the micro computer 1.
  • a charger 5, a static eliminator lamp 6 and a main motor 7 are connected to the output side of the micro computer 1 through driver circuits 4a, 4b and 4c, respectively.
  • a pulse plate and a pulse generator 8 including an optical sensor which converts the revolution amount of the pulse plate to electric pulse signals and transmits the electric pulse signals to the micro computer 1 are connected to the main motor 7.
  • a pulse generator 8 may be of any type which can detect the revolution synchronized with the main motor 7. For instance, it can be composed of a pulse plate and a photo sensor for detecting the revolution thereof, which is directly installed at the main motor 7 or at the drive system from the main motor 7 to the photosensitive body. And a rotary encoder can be used, too.
  • Step S1 the main motor 7 begins driving, thereby causing the photosensitive body drum to begin to rotate (Step S2).
  • the photosensitive body drum gradually begins to rotate with, for instance, a time lag of 0.1 to 0.2 seconds.
  • the micro computer 1 resets the timer 3 (Step S3).
  • the counter 9 which utilizes a register in the micro computer 1 is cleared (Step S4).
  • the micro computer 1 waits for input from the pulse generator 8.
  • the value of the counter 9 is increased by only 1 (Step S6), and it is then judged (in the step S7) whether or not the value of the counter 9 reaches an appointed set value C o .
  • step S8 it is judged in the step S8 whether or not the period of time T, measured by the timer 3, from having reset the timer in the step S3 to that the value of the counter 9 has reached the set value C o comes near the range of the tolerance D for the appointed cycle time T o . If the period of time T is not sufficiently near the range of the tolerance D thereof, the processing returns to the step S4 by way of reset processing of the timer 3 in the step S9.
  • the processing goes to the step S10, wherein the pre-fatigue process is executed.
  • the processing goes to usual copying actions (Step S11). After that, copying actions known to the public are carried out by the set quantity, and then the processing is terminated.
  • composition of the hardware of an image processing equipment according to a second embodiment of the invention is shown in Fig. 3. As shown in this figure, the point in which the composition of the hardware of the second embodiment is different from that of the hardware of the first embodiment shown in Fig. 1 is only that a memory M is connected to the micro computer 1.
  • the memory M memorizes the measurement time t i by the timer 3 and the voltage value V i of the charger outputted corresponding thereto as pair.
  • the memorizing details of the memory M is set as per machine.
  • Fig. 5 shows one example of the memorizing details of such a memory M.
  • the photosensitive body drum is almost completely warmed up in t o seconds since start of the revolution of the photosensitive body drum.
  • S1, S2, .... indicates the number of the processing procedures (Step).
  • the main motor 7 begins driving, thereby causing the photosensitive body drum to begin to rotate (Step S2).
  • the photosensitive body drum gradually begins to rotate with, for instance, a time lag of 0.1 to 0.2 seconds.
  • the micro computer 1 resets the timer 3 (Step S3).
  • step S4 it is waited that the time t of detection by the timer 3 firstly becomes t1. As the time t of detection becomes t1, the voltage value V1 corresponding to t1 shown in Fig. 5 is searched for in the memory M and is impressed to the charger 5.
  • step S5 As voltage impression to the charger 5 is completed, it is consecutively judged (in the step S5) whether or not the time t of detection reaches to (the warming-up time of the main motor 7). If not, the processing returns to the step S4, and the routines S4 and S5 are repeated. Then, the voltage V i is impressed on t i seconds.
  • V o is the voltage of the charger suited to usual copying actions or a slightly lower voltage than the voltage of the charger, and such a voltage as can not be developed by irradiation of a subsequent eliminator lamp 6 is selected.
  • Step S8 usual copying actions. Consecutively, usual copying actions known to the public are carried out by the set quantity, thereby causing the processing to be terminated.
  • the main charger 5 is used in charging, and an eliminator lamp 6 is used to eliminate electric charge.
  • a halogen lamp for forming an image can be used instead of the eliminator lamp 6.
  • the light of a halogen lamp which is reflected to a white sheet attached to the rear side of the document table is irradiated to the surface of the photosensitive body drum.
  • a transcribing unit is used for charging and a static eliminator lamp is used for eliminating electric charge.
  • an eliminator lamp 6 can be used instead.
  • the memorizing details of the memory M is composed of "pair of the time of detection and the impression voltage corresponding thereto", it can be composed as "pair of the revolution speed of the main motor or the photosensitive body drum and the impression voltage corresponding thereto".
  • the revolution speed of the main motor or the photosensitive body drum can be detected by pulse signals coming from the pulse generator 8, and the impression voltage corresponding thereto is searched for in the memory M.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Claims (6)

  1. Procédé pour exécuter un processus de pré-fatigue dans un équipement de traitement d'image, comportant un processus de charge électrique et de suppression de charge statique sur un corps photosensible avant des actions de traitement d'image, caractérisé en ce que la vitesse de surface du corps photosensible est mesurée et le courant d'impression appliqué à un dispositif de charge à effet corona (5) pour charger le corps photosensible dans le processus de pré-fatigue est commandé en réponse à la vitesse de surface mesurée du corps photosensible.
  2. Procédé selon la revendication 1, dans lequel le processus de pré-fatigue est amorcé après que la vitesse de surface mesurée du corps photosensible a atteint une valeur constante, et un courant d'impression constant est appliqué au dispositif de charge à effet corona (5) au cours du processus de pré-fatigue.
  3. Procédé selon la revendication 1, dans lequel le courant d'impression appliqué au dispositif de charge à effet corona (5) au cours du processus de pré-fatigue est modifié conformément aux variations de la vitesse de surface mesurée du corps photosensible.
  4. Equipement de traitement d'image comportant des moyens (1, 3 à 8, M) pour exécuter un processus de pré-fatigue et comportant un moteur (7) pour entraîner un corps photosensible, un dispositif de charge à effet corona (5) pour charger électriquement le corps photosensible, un moyen (6) pour éliminer les charges statiques du corps photosensible, et un micro-ordinateur (1) pour commander ledit moteur (7), ledit dispositif de charge à effet corona (5) et ledit moyen (6) pour éliminer la charge statique, caractérisé en ce que
       des moyens (8) pour mesurer la vitesse de surface du corps photosensible sont fournis, et
       ledit micro-ordinateur (1) est programmé de manière à commander le courant d'impression appliqué audit dispositif de charge à effet corona (5) en réponse à des signaux qui représentent ladite vitesse de surface et qui sont appliqués audit micro-ordinateur (1) à partir desdits moyens (8) de mesure de la vitesse de surface.
  5. Equipement de traitement d'image selon la revendication 4, dans lequel ledit micro-ordinateur (1) est programmé de manière à démarrer le processus de pré-fatigue après qu'il a jugé en réponse aux signaux en provenance desdits moyens (8) de mesure de la vitesse de surface que la vitesse de surface a atteint une valeur constante.
  6. Equipement de traitement d'image selon la revendication 4, dans lequel ledit micro-ordinateur (1) est programmé de manière à modifier le courant d'impression appliqué au dispositif de charge à effet corona (5) au cours du processus de pré-fatigue conformément aux variations de la vitesse de surface mesurée telle que mise en évidence par les signaux appliqués audit micro-ordinateur (1) par lesdits moyens (8) de mesure de la vitesse de surface.
EP19900113705 1989-07-18 1990-07-17 Système de traitement d'images Expired - Lifetime EP0409184B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP185801/89 1989-07-18
JP1185801A JPH0350587A (ja) 1989-07-18 1989-07-18 画像形成装置
JP1226552A JPH0389291A (ja) 1989-08-31 1989-08-31 画像形成装置
JP226552/89 1989-08-31

Publications (3)

Publication Number Publication Date
EP0409184A2 EP0409184A2 (fr) 1991-01-23
EP0409184A3 EP0409184A3 (en) 1992-05-13
EP0409184B1 true EP0409184B1 (fr) 1994-10-05

Family

ID=26503338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900113705 Expired - Lifetime EP0409184B1 (fr) 1989-07-18 1990-07-17 Système de traitement d'images

Country Status (2)

Country Link
EP (1) EP0409184B1 (fr)
DE (1) DE69013091T2 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5823033A (ja) * 1981-08-03 1983-02-10 Fuji Xerox Co Ltd 電子写真法
JPS61145576A (ja) * 1984-12-19 1986-07-03 Sharp Corp 感光体の表面電位補正方法
JPS62135848A (ja) * 1985-12-09 1987-06-18 Sharp Corp 感光体の駆動制御方法
JPS63158572A (ja) * 1986-12-23 1988-07-01 Konica Corp 感光体疲労回復を抑えた複写装置
JPS63191167A (ja) * 1987-02-04 1988-08-08 Konica Corp 感光体疲労等を補償した複写装置

Also Published As

Publication number Publication date
DE69013091T2 (de) 1995-05-11
EP0409184A2 (fr) 1991-01-23
EP0409184A3 (en) 1992-05-13
DE69013091D1 (de) 1994-11-10

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