EP0409184A2 - Système de traitement d'images - Google Patents
Système de traitement d'images Download PDFInfo
- Publication number
- EP0409184A2 EP0409184A2 EP90113705A EP90113705A EP0409184A2 EP 0409184 A2 EP0409184 A2 EP 0409184A2 EP 90113705 A EP90113705 A EP 90113705A EP 90113705 A EP90113705 A EP 90113705A EP 0409184 A2 EP0409184 A2 EP 0409184A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- photosensitive body
- image processing
- processing equipment
- time
- fatigue process
- 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.)
- Granted
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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 an electrostatic image processing equipment for, for instance, a copying machine, etc. which includes a pre-fatigue process.
- the processing for repeating the electric charging and static eliminating process prior to such an actual image processing process as shown in the above is called “Pre-copying process” or “Pre-fatigue process”, and it is an excellent technique in the point of attempting to stabilize the charging capacity at the point when an actual image processing starts.
- a 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 as shown in the above 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 in the 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 in the 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.
- the invention can bring us an image processing equipment in which the pre-fatigue process including the electric charging and static eliminating process is conducted for the photosensitive body prior to an image processing action and which is characterized in that the impression current upon a corona discharger for charging on the pre-fatigue process can be controlled according to the surface speed of the photosensitive body.
- the case that the pre-fatigue process is started after the surface speed of the photosensitive body is made constant after the photosensitive body begins to operate is given.
- Starting the pre-fatigue process after the surface speed of the photosensitive body is made constant is considered to be “starting the pre-fatigue process with such an appointed period of time delayed as to sufficiently include an inevitable time lag which occurs due to a balance between a motor to drive the photosensitive body and the load thereof as shown in the first embodiment described later" or “starting the pre-fatigue process at the point when detecting the revolution speed of the photosensitive body or a motor and a drive system thereof and making it constant".
- 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.
- means for changing the impression current according to the changes of the peripheral speed of the photosensitive body For instance, there are means for changing the corona current to an appointed degree within a fixed period of time since starting the drive of the photosensitive body as in the second embodiment of the invention described later and means for impressing the corona current according to each of the speeds by detecting the 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 Japanese Pat. Laid-Open No. Sho-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. And 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 as shown in the above 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.
- 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).
- 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 C0.
- 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.
- the appointed period of time is set with some allowance secured for the warming-up time of the photosensitive body in accompanying with the imbalance of the motor and a load and the pre-fatigue process is started when the waiting time elapses since turning on the copy button.
- the processing procedure can be simplified as much as the waiting time will be made somewhat longer since some allowance must be secured, and a pulse generator can be omitted.
- composition of the hardwares of an image processing equipment according to the second embodiment of the invention is shown in Fig. 3.
- the point which the composition of the hardwares of the second embodiment is different from that of the hardwares 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.
- 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)
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1185801A JPH0350587A (ja) | 1989-07-18 | 1989-07-18 | 画像形成装置 |
| JP185801/89 | 1989-07-18 | ||
| 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 true EP0409184A2 (fr) | 1991-01-23 |
| EP0409184A3 EP0409184A3 (en) | 1992-05-13 |
| EP0409184B1 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 (2)
| 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 |
| 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 |
-
1990
- 1990-07-17 DE DE1990613091 patent/DE69013091T2/de not_active Expired - Fee Related
- 1990-07-17 EP EP19900113705 patent/EP0409184B1/fr not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69013091T2 (de) | 1995-05-11 |
| DE69013091D1 (de) | 1994-11-10 |
| EP0409184B1 (fr) | 1994-10-05 |
| EP0409184A3 (en) | 1992-05-13 |
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