CN1188916A - Image formation device with electric remove means before duplicate - Google Patents
Image formation device with electric remove means before duplicate Download PDFInfo
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- CN1188916A CN1188916A CN97118293A CN97118293A CN1188916A CN 1188916 A CN1188916 A CN 1188916A CN 97118293 A CN97118293 A CN 97118293A CN 97118293 A CN97118293 A CN 97118293A CN 1188916 A CN1188916 A CN 1188916A
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Abstract
An image forming apparatus of the present invention includes a latent image forming unit to form an electrostatic latent image on a charged image carrier, a developing device to form a developer image by developing the electrostatic latent image formed on the image carrier by a developer and a charge removing unit to discharge the image carrier before transferring the developer image and reduce the electrostatic adsorbing power of the developer image to the image carrier. The charge removing unit includes a charge removing light source to apply the charge removing light to the image carrier and the developer image and the charge removing charger to remove the charge by discharging the image carrier and able to control the discharge output. The charge removing unit is controlled to be adjusted a charge removing capacity.
Description
The present invention relates to duplicating machine, printing machine etc. form image according to the electrofax mode image processing system.
As everyone knows, image processing system has duplicating machine, printing machine of electrofax mode etc.In duplicating machine of electrofax mode etc., make the photosensitive drum body uniform charged with main charger after, the original copy on the original copy seat is exposed, make the imaging on photosensitive drum body of its reflected light, thereby on photosensitive drum body, form electrostatic latent image.By developer the electrostatic latent image on this photosensitive drum body is supplied with toner particle again and carry out video picture, on cylinder, form the toner picture.Then, with duplicating charger established toner is looked like to copy on the charged copy paper, thereby on this copy paper, form reproduced image.
In recent years, the duplicating machine copying speed of this electrofax mode is more and more higher.Along with this high speed, because the photosensitive drum body diameter is increasing, the cylinder linear velocity is more and more high, thereby makes the duplicating efficient of the toner picture that adheres electrostatically on the photosensitive drum body get over decline.
Also promptly, when being imaged on toner on the photosensitive drum body and looking like to copy on the copy paper, if it is excessive to be attached to the electrostatic adhesive force of toner of photosensitive drum body, then the toner picture on the photosensitive drum body just can not fully duplicate on the copy paper.As a result, produce copy paper epigraph fuzzy (style of calligraphy characterized by hollow strokes phenomenon), concentration deficiency, compactness poor, duplicate image bad phenomenon such as gaps and omissions.And this bad phenomenon is along with the copying speed high speed is got over seriously.
Therefore, in order effectively the toner that adheres electrostatically on the photosensitive drum body being looked like to copy on the copy paper, to take after video picture more, be provided with to remove the electric hand section before duplicating.The effect that removes the electric hand section before this duplicating is, after video picture, duplicate before, through removing the electrostatic adhesive force that electricity weakens toner and cylinder on the photosensitive drum body, effectively toner is copied on the copy paper.
Removing the electric hand section before this duplicating roughly is divided into mainly eliminating by light and removes electric light source before the duplicating of electric charge on the photoreceptor and eliminate electric charge on the photoreceptor and improve preceding charger two classes of duplicating that the toner self-replication uses by discharges such as leads.
Remove electric light source before duplicating and be and a kind ofly eliminate by rayed that electric charge uses cold-cathode tube, LED etc. usually to weaken the means of toner to the electrostatic adhesive force of photoreceptor on the sense body.In recent years, along with the high speed of duplicating machine, need to improve duplicating efficiency, for this reason, effectively way is to improve to duplicate the preceding light quantity of removing electric light source.To removing electric light source before duplicating, many uses cold-cathode tube bigger than LED light quantity.
Charger is a kind ofly to remove electricly weakening the electrostatic adhesive force of light body and toner to photoreceptor with charging before duplicating, and make toner further charged, thereby the toner picture copies to the means on the copy paper easily.Duplicate preceding charger as this, use from superfine leads such as platinum or tungsten oxide carry out polarity and photoreceptor with the device of the DC discharge of polarity opposite (promptly with the toner same polarity), or apply polarity and photoreceptor after the DC biasing with polarity opposite (promptly with the toner same polarity), the device that carries out the AC discharge.
As mentioned above, duplicating machine for the electrofax mode, especially for making the copying speed high speed improve the duplicating machine of photosensitive drum body speed etc.,, use cold-cathode tube to remove electric light source as before the duplicating of the duplicating efficiency that improves the toner picture in order to improve duplicating efficiency more.Yet as this situation, there are the following problems for the characteristic of cold-cathode tube.
That is, the change of the light quantity of cold-cathode tube is big.For example after the cold-cathode tube continuous illumination, after promptly duplicating machine duplicated continuously, if be in go out state and then when lighting of breath for a long time, the light quantity of just having lighted can be low, and was then, slowly light.
Therefore, set the light quantity of cold-cathode tube, it is bad that the light quantity when making continuous illumination can prevent to duplicate image such as burst.At this moment, when just having lighted after long-time the placement, the light quantity of removing electric light before duplicating can be not enough, causes the duplicating efficiency variation, and then can duplicate burst.The light quantity setting of the cold-cathode tube of just having lighted after for this reason, needs will be placed for a long time is to be enough to not take place to duplicate the required light quantity of burst.Yet in this case, the light quantity of cold-cathode tube can be superfluous during continuous illumination, can make the unfavorable condition of image generation image remnants.Also promptly, under the situation of using cold-cathode tube, just lighted together with the bad optimal light weight range of image narrow (the light quantity affluence degree that duplicates burst, image remnants is little) does not take place in the continuous illumination.
Have, under low temperature environment, under at 5～10 ℃, 20RH% environment, this cold-cathode tube has the characteristic that light quantity descends again.Therefore, when under low temperature environment, using cold-cathode tube, deficiency in light quantity, it is bad to duplicate image such as burst.
On the other hand, duplicating preceding charger is with opposite polarity discharge to eliminate the photosensitive drum body electric charge by carrying out polarity and photosensitive drum body.Like this, being equivalent to electric charge with the toner same polarity makes image portion toner further charged and improve duplicating efficiency.Yet, can make the some faint charged toner that is attached to non-image part (cylinder base portion) like this, the toner photographic fog on the so-called cylinder is also charged.This faint charged toner can not be replicated under the charger situation before need not duplicating, and is transported into cleaning portion, if make it charged with charger before duplicating, then very easy being replicated is so form very big photographic fog on the copy paper.Therefore, before duplicating, use under the charger situation, can produce the drawback that the photographic fog grade degenerates.
The bad image that causes of charger also is a photographic fog before this duplicating, when mainly occurring in photosensitive drum body near its life-span when (because of the base substrate current potential rises) or many wet environments (because of the developer carried charge descends).
The object of the present invention is to provide a kind of image processing system that can obtain good image, image bad phenomenon such as burst, image remnants, photographic fog can not appear duplicating in this device.
According to image processing system provided by the present invention, contain: make all charged charged means of spoon of image-carrier; The sub-image that forms electrostatic latent image on described charged image-carrier forms means; With developer the electrostatic latent image that is formed on the described image-carrier is carried out video picture, to form the video picture means of developer picture; Look like to copy to the means of duplicating on the duplicating material with being formed on developer on the described image-carrier; Before duplicating described developer picture,, remove the electric hand section to before the duplicating of the electrostatic attraction of described image-carrier to reduce described developer to the described image-carrier electricity that disappears; Removing the electric hand section before described the duplicating comprises: described image-carrier and developer picture are shone the electric light source that removes that removes electric light; Described image-carrier discharge is removed electricity, can change the electric charger that removes of discharge output simultaneously; Change the described discharge output that removes electric charger, will remove the control device that electric energy power is adjusted to setting of removing of electric hand section before described the duplicating.
Summary of drawings
Before duplicating for expression the present invention has, removes Fig. 1 the cut-open view of the duplicating machine integral body of electric hand section;
Fig. 2 is the general diagrammatic sketch of image forming part and control system in the duplicating machine shown in Figure 1;
Fig. 3 is for expression cold-cathode tube lighting hours, light quantity and duplicate the curve map of the relation of burst grade;
Fig. 4 is for representing the curve map of the relation of cold-cathode tube lighting hours and light quantity under the stand-by time different situations respectively;
The duplicate preceding charger output valve curve map of Fig. 5 for controlling according to the cold-cathode tube stand-by time;
Fig. 6 is the curve map that duplicates preceding charger output valve by controlled environment;
Fig. 7 is the life-span (cylinder revolution) of expression photosensitive drum body and the curve map of the relation of duplicating preceding charger output valve;
Fig. 8 exports the process flow diagram of control action for the discharge that removes electric charger in the expression duplicating machine shown in Figure 1;
The curve map that duplicates burst grade when Fig. 9 discharges output for expression control removes electric charger;
The curve map of the photographic fog state when Figure 10 discharges output for expression control removes electric charger.
Below, with reference to accompanying drawing, describe the embodiment that the present invention is used for the electro photography duplicating machine in detail.
At first, once duplicating machine is whole constitutes for general description.As shown in Figure 1, duplicating machine has framework 10, is provided with the rotation photosensitive drum body 12 freely that constitutes as arsenic selenium as image-carrier in these framework 10 substantial middle portions.Around photosensitive drum body 12, dispose main charger 11 successively, play the effect of video picture means imagescope 13, play duplicate the means effect duplicate charger 14.Peel off charger 15, separation claw 16, cleaning plant 17 and remove electric light 18, with composing images formation portion 20.
Be provided with above the framework 10, the original copy mounting table 32 that clear glass constitutes, and to the original copy mounting table 32 automatic automatic manuscript handling devices (ADF hereinafter referred to as) 80 of supplying with original copy D.
ADF80 also has the function as the original copy gland that opens and closes original copy mounting table 32.This ADF80 has the original copy of mounting original copy D and supplies with carriage 82 and spread all over the original copy conveying belt 85 of whole original copy mounting table 32 configurations basically.The original copy that mounting is supplied with on the carriage 82 in original copy imports original copy mounting table 32 through transport path 84, is transported to assigned position and location by original copy conveying belt 85.Then, the original copy D after following scanner 22 reads through transport path 86, is discharged to the original copy row paper portion 88 above the ADF80 by original copy conveying belt 85.
Original copy mounting table 32 belows in the framework 10 are provided with the scanner 22 that reads the image of contained original copy D on the original copy mounting table 32.This scanner 22 has, the exposure lamp 24 that the back is surrounded by reverberator 23, and and exposure lamp 24 together mounting in first catoptron 25 of first carrier 33.Scanner 22 also has, and mounting is in second carrier 34 and one movably second and third catoptron 26,27, fixing lens 28 and the 4th, the 5th and the 6th fixing catoptron 29,30,31.
First and second carrier 33,34 moves with fixing speed along original copy mounting table 32, and the irradiates light that sends by exposure lamp 24 scans original copy D.Then, the reflected light that comes of original copy D through first to the 6th catoptron 25～27 and 29～31 and 12 pairs of photosensitive drum body 12 surfaces of lens 28 guiding photosensitive drum bodies expose.
As described later, above-mentioned exposure is carried out on the surface by the photosensitive roller 12 of main charger 11 uniform chargeds, just formed electrostatic latent image corresponding to the image of original copy D.The toner as developer that formed latent image-use imagescope 13 is provided carries out video picture, forms the toner picture on photosensitive drum body 12.Thus, main charger 11 and scanner 22 constitute sub-image formation means among the present invention.
Between the 3rd catoptron 27 and lens 28, be provided with the automatic exposure analyzer 21 of measuring exposure light amount.Through the light of the 3rd catoptron 27 reflections, a part of incident automatic exposure analyzer 21, automatic exposure analyzer 21 will be exported to the CPU62 that describes below corresponding to the output voltage of image color as the original copy concentration signal.
The side downside of framework 10, loading and unloading are equipped with first and second paper feeding cassette 35 and 36 freely, manyly use paper P as duplicating material in order to hold respectively.Be formed with transport path 38 in the framework 10, by the portion of duplicating that is positioned at photosensitive drum body 12 and duplicates 14 of chargers, output is sent from what first and second paper feeding cassette 35 and 36 took out and is used paper P.The terminal of this transport path 38 is provided with fixing device 40.Facing to forming escape hole 42, these escape hole 42 row's of being equipped with paper carriers 43 on the sidewall of the framework 10 of fixing device 40.
Be provided with near first and second paper feeding cassette 35 and 36 to take out and pick up roller 44 with paper P from each paper feeding cassette.The upstream side of photosensitive drum body 12 is provided with the collimation roller 46 with the whole position of paper P in the transport path 38.Collimation roller 46 other being provided with are detected the sensor 48 that arrives with paper P.
Pick up that roller 44 taken out from first paper feeding cassette 35 or second paper feeding cassette 36 every with paper P behind collimation roller 46 whole positions, flow to the portion of duplicating.In the portion of duplicating, the toner picture on the photosensitive drum body 12 copies to on the paper P by duplicating charger 14.
That has duplicated the toner picture uses paper P, peels off photosensitive drum body 12 by the AC corona discharge of peeling off charger 15 and separation claw 16.That has peeled off is transported to fixing device 40 with the conveying belt 50 of paper P through constituting transport path 38.Then, by being discharged on the paper carrier 43 through exit roller 51 behind the fixing device 40 fusion fusing toner pictures with paper P.
Be provided with between fixing device 40 and exit roller 51 and will import the distributed channel gate 55 of reversing paths 52 with paper P, reversing paths 52 reaches and is provided with a plurality of conveying rollers 56 in the transport path 54 again.Be provided with in the temporary transient stacking part 53 and pick up roller 57, one of every taking-up is just delivered to transport path 54 by aggregation with paper P again.
Under the copy situation of two sides, by fixing device 40 be imported into reversing paths 52 with paper P through distributed channel gate 55, counter-rotating back aggregation is in temporary transient stacking part 53.Use paper P behind the aggregation,, send into collimation roller 46 by transport path 54 again by after picking up roller 57 and taking out from temporary transient stacking part 53.By behind this collimation roller 46 whole positions import the portion of duplicating once more with paper P, duplicate in the portion at this, photosensitive drum body 12 looks like toner to copy to the reverse side of usefulness paper P.Afterwards, by transport path 38, fixing device 40 and exit roller 51, be discharged to paper carrier 43 with paper P.
Below, the structure of detailed description photosensitive drum body 12 and image forming part 20.As shown in Figure 2, make the main charger 11 of photosensitive drum body 12 surperficial homogeneous band predetermined potential electricity have corona wire 11a and aperture plate 11b.Not shown power supply is connected in corona wire 11a, it is applied voltage produce corona discharge.High-tension transformer 60 is connected in aperture plate 11b, and it is applied aperture plate voltage.These power supplys and high-tension transformer 60 are connected in the CPU62 as control device.
Have exposure position 12a along photosensitive drum body 12 sense of rotation on photosensitive drum body 12 surfaces of main charger 11 downlink sides, the reflected light of origin self-scanning device 22 exposes to it.In this exposure position 12a, form the electrostatic latent image on photosensitive drum body 12 surfaces.
Between exposure position 12a and main charger 11, be provided with LED65 into cancellation charged particles irradiates light.Also promptly, the illumination by this LED65 makes the unwanted picture part not form electrostatic latent image.Imagescope 13 has supplies with the video picture roller 13a that the electrostatic latent image on photosensitive drum body 12 surfaces carries out video picture with toner particle.Under CPU62 control, high-tension transformer 76 imposes on this video picture roller 13a with the video picture bias voltage.
Be provided with thermistor 66 between imagescope 13 and the LED65, detect the temperature on photosensitive drum body 12 surfaces as the temperature detection means.The end of the executive component 66a contact photosensitive drum body 12 of this thermistor 66 also is the cylinder surface in the image forming area outside.Thermistor 66 is exported to CPU62 with detection signal.
Between imagescope 13 and LED65, be provided with the surface potential sensor 67 that detects photosensitive drum body 12 surface potentials.
At the downlink side of the imagescope 13 relevant, be provided with and look like to copy to duplicating charger 14 and will peel off charger 15 on the paper P with what paper P peeled off photosensitive drum body 12 with being formed at toner on the photosensitive drum body 12 with photosensitive drum body 12 sense of rotation A.Duplicate charger 14 and peel off charger 15 formation one, and be connected in CPU62 through high- tension transformer 68 and 70 separately.
Before being provided with between the charger 14 and duplicating, removes imagescope 13 and duplicating electrical equipment 100.Remove before duplicating and remove the electric hand section before electrical equipment 100 plays a part to duplicate, electricity is removed on photosensitive drum body 12 surfaces, reduce the Electrostatic Absorption power of toner picture photosensitive drum body 12 surfaces.
Remove electrical equipment 100 before duplicating and structurally make, will shine the cold-cathode tube 102 that removes electric light to photosensitive drum body 12 as duplicating the preceding electric light that removes, with the preceding charger 104 of duplicating of photosensitive drum body 12 discharges is used.
Cold-cathode tube 102 axially sets along photosensitive drum body 12, and is connected in CPU62 by light source drive 106.As charger 104 before duplicating, can use along photosensitive drum body 12 axially extended platinum coating lines (φ 65 μ m) and be connected in CPU62 through power supply 108.
The downlink side of peeling off charger 15 is provided with separation claw 16, and the downlink side setting at separation claw has the cleaning plant 17 that sheet (blade) 78 is drawn together in cleaning again.Cleaning is drawn together sheet 78 and is provided with to such an extent that contact with photosensitive drum body 12 surfaces, wipes off from the surface not duplicating the toner that residues in cylinder surface.
Be provided with charged device 77 between separation claw 16 and the cleaning plant 17 as auxiliary cleaning mechanism, this charged device 77 has corona wire, is used for this AC voltage and imposes on photosensitive drum body 12.
11 of cleaning plant 17 and main chargers are provided with except that electric light 18.Remove electric light 18 and be connected to CPU62 through light source drive 94.Under CPU62 control, the voltage that imposes on light source drive 94 by change changes the light quantity except that electric light.
CPU62 is connected to timer 96, thermistor 40c, term of life counter 97 and storer 93.Timer 96 is measured the actuation time and the intermission of duplicating machine, promptly measures and once duplicates the time that finishes till duplicate the action beginning back to next time.The access times of 97 pairs of photosensitive drum bodies 12 of term of life counter are counted.The various control datas of storer 93 storages.
In the duplicating machine of above-mentioned formation, remove the use resume of electrical equipment 100 before duplicating, the discharge output of charger 104 before control is duplicated according to the light quantity change of cold-cathode tube 102, environmental turbulence, photosensitive drum body 12.Keep the electric energy power of removing of expectation by this control, can prevent unfavorable conditions such as duplicating burst, image remnants, photographic fog.
The relation of charger 104 discharge outputs before the following describes cold-cathode tube 102 light quantities and duplicating.The light quantity of cold-cathode tube 102 became with its intermission or environment temperature.
Fig. 3 represents duplicating machine was positioned over respectively in normal temperature environment (23 ℃ of temperature, humidity 50%) and the low temperature environment (10 ℃, humidity 20%) after 60 minutes, after promptly ending 60 minutes, light the variation and the relation of duplicating the burst grade this moment of light quantity when removing cold-cathode tube 102 in the electrical equipment 100 before duplicating.
Among Fig. 3, transverse axis is represented the continuous duplicating number corresponding to cold-cathode tube 102 continuous lighting times, and first longitudinal axis is represented the light quantity of cold-cathode tube (PTL) 102, and second longitudinal axis represents to duplicate the burst grade.
As the duplicating machine that research is used, adopt Toshiba's molding to intend PP-CF154 (65CPM machine), developer uses D-1710, and toner uses T-2510, and photosensitive drum body adopts the PC cylinder of φ 100.The LT specification paper conduct of using hammer crusher Tidal-DP is to duplicating the evaluation of burst.The highest illumination is the pipe of 1200 Luxs (lux) in the cold-cathode tube 102 use normal temperature environments.The illumination that is used for actinometry is used ミ ノ Le system T-IM type, and the probe of illuminometer is provided with the line of rabbet joint of 3 * 10mm, to measure illumination.
From Fig. 3 as seen, under normal temperature environment, when duplicating machine was placed the back action for a long time, when promptly cold-cathode tube 102 was lighted, the cold-cathode tube of just having lighted was darker, had just lighted several seconds to the tens seconds scope light quantities in back and had not reached the highest output, and is afterwards, just more and more brighter gradually.Before the light quantity of cold-cathode tube 102 rose to about 1000lux, it was more to duplicate burst, along with the rising of light quantity, duplicated burst and just reduced gradually.Also have same trend in low temperature environment, compare with normal temperature environment, the light quantity of cold-cathode tube 102 is whole to descend.
The light quantity of the cold-cathode tube 102 after just having lighted and duplicating machine intermission, promptly the intermission of cold-cathode tube 102 is relevant.Fig. 4 represents to make 102 intermissions of cold-cathode tube to do under the situation of various variations, the corresponding light quantity variation relation of the cold-cathode tube when ending the back continuous illumination.Be used for the duplicating machine of this test and illumination photometry device with shown in Figure 3 identical, and test under the same conditions.
Among Fig. 4, transverse axis is represented the continuous lighting time of cold-cathode tube 102, the differentiation of cold-cathode tube light quantity when the longitudinal axis is represented continuous illumination.Clearly visible from this figure, the rising of cold-cathode tube light quantity changes with the difference of 102 standing times of cold-cathode tube during continuous illumination, and standing time is short more, and the light quantity after just having lighted is more near maximum amount, and standing time is long more, begins illumination from more little light quantity.
According to this example, the discharge output of charger 104 is risen before the duplicating after as the CPU62 of control device copy just having been begun, remedy the deficiency in light quantity of the cold-cathode tube 102 after copy has just begun, do not take place to duplicate on the predetermine level of burst except that electric energy power is set in removing electrical equipment 100 integral body before duplicating.
The discharge of charger 104 output can be adjusted by the voltage that control power supply 108 applies before duplicating.As shown in Figure 3, can carry out developing opposite control to the discharge output of charger 104 before duplicating with cold-cathode tube 102 light quantities.Also promptly, the discharge output of duplicating preceding charger after control makes cold-cathode tube 102 just light is maximum, descends along with the increase of cold-cathode tube light quantity is exported gradually discharge again.Thus, the electric energy power of removing of removing electrical equipment 100 before duplicating is always roughly remained on the predetermined value.
As shown in Figure 5, the discharge output valve of charger 104, i.e. initial value before the duplicating after setting cold-cathode tube 102 and just lighted according to the duplicating machine intermission.Also promptly, the intermission is long more, and the initial output valve of charger 104 is set highly more before duplicating.Then, after cold-cathode tube 102 is lighted, discharge output is descended gradually, when cold-cathode tube 102 reaches maximum amount, make the discharge output value of being maintained fixed.
When for example using the cold-cathode tube of maximum amount in 500～2000lux scope, according to cold-cathode tube standing time, the copy beginning make during back 120 seconds duplicate before charger 104 discharges export and descend gradually in 1～20 μ A scope.
Thus, no matter the duplicating machine intermission how, total cold-cathode tube 102 and duplicate before the two the electric energy power of removing of charger 104, that removes electrical equipment 100 before promptly duplicating can keep constant substantially except that electric energy power.
As mentioned above, in low temperature environment, compare with normal temperature environment, the light quantity of cold-cathode tube 102 is whole to descend, the height when discharge of charger 104 output must be than normal temperature before duplicating.On the contrary, under the many wet environments of high temperature (as, 30 ℃ of temperature, humidity 85%) because the decline of developer carried charge, so the photographic fog on the photosensitive drum body increases.In this state, although the toner of base substrate part is original faint charged because of it, should reclaim by cleaning plant 17 by duplicating position, but if charger 104 applies over-discharge to photosensitive drum body before duplicating, because band forceful electric power, these toners all pull on the copy paper, form copy paper substrate photographic fog.Therefore, under the many wet environments of high temperature, reduce the discharge output of the preceding charger 104 of manifolding.
So, according to this example, as shown in Figure 6, compare with normal temperature environment, charger 104 discharge outputs were risen before control made and duplicates when low temperature environment, and on the contrary, control makes discharge output descend in hot environment.For example, according to institute's testing environment temperature, the discharge of charger 104 output can change in 1～20 μ A scope before duplicating.
By above-mentioned control, eliminated the difference with normal temperature environment, thereby can prevent the image remnants of duplicating on burst and the photosensitive drum body.Among the figure, N/N represents the ambient temperature and moisture environment, and L/L represents the low temperature and low humidity environment, and H/H represents hot and humid environment.
CPU62 control makes the discharge output of charger 104 before the system with the use resume of photosensitive drum body 12, also promptly levels off to its life-span (term of life) with photosensitive drum body and descends.In other words, along with photosensitive drum body 12 near its life-span, because of permanent residual electric potential rises and sensitivity descends the base substrate current potential is risen, so photographic fog increases on the cylinder.Therefore, as shown in Figure 7, the cylinder 12 access times count values that CPU62 produces according to term of life counter 97, after the photosensitive drum body life-span reached setting, the discharge output of charger 104 descended gradually before control was duplicated.At this moment, discharge output is slowly descended.
Fig. 8 represents the concrete control action according to above-mentioned all this duplicating machine of test findings.At first, CPU62 begins to control the dormant state (step 801) that the placement form of afterwards judging duplicating machine is in the laying state of power remove (OFF) or is in power connection (ON).Calculate the intermission of duplicating machine, i.e. time of being placed of cold-cathode tube 102.For example, be under the stand-by situation ending form, use the timer 96 of duplicating machine to calculate the intermission (step 802) that cold-cathode tube 102 is placed.
On the contrary, ending form is under duplicating machine power remove (OFF) situation, when power connection,, be positioned over certain state, calculate the intermission (step 803) thus with this temperature estimation duplicating machine earlier according to the temperature of the next input heated rollers 40a of thermistor 40c.
Then, CPU62 determines to duplicate the initial discharge output (1) (step 804) of preceding charger (PTC) 104 according to the intermission and the control data shown in Figure 5 of calculating.For example, the intermission as shown in Figure 5, selects initial discharge to be output as the curve of 10 μ A when being 3 minutes.
The temperature (step 805) of photosensitive drum body 12 when then, CPU62 is according to the input duplicating machine power connection of thermistor 66.Infer residing certain environment of this duplicating machine with the bowl temperature of measuring, and determine to duplicate the discharge output (2) (step 806) of preceding charger 104 according to control data shown in Figure 6.For example, the environment of putting when duplicating machine is the H/H environment, promptly during high temperature/high humidity environment, as shown in Figure 6, must make output than N/N environment, the discharge output of the charger 104 1.5 μ A that descend before promptly duplicating in normal temperature/normal wet environment.
And then CPU62 is according to the count value and the control data shown in Figure 7 of term of life counter 97, and (3) (step 807) exported in the discharge of charger 104 before determining to duplicate.For example, the cylinder life-span (term of life) as shown in Figure 7, must make the discharge output decline 0.3 μ A of charger 104 before duplicating when being 400,000 (being that the cylinder revolution is 400,000 circles).
Then, according to determined discharge output (1), (2) and (3), calculate the final discharge output valve of charger 104 before duplicating.Also promptly, (1.5)+(0.3)=-1.8 μ A.The discharge output of charger 104 before the duplicating after the duplicating machine action beginning, its value are the 1.8 μ A that descend of the curve from 3 minutes intermissions shown in Figure 5.
Once you begin duplicate action, CPU62 promptly controls cold-cathode tube 102 irradiations and removes electric light, make simultaneously duplicate before charger 104 export in above-mentioned initial discharge and begins under (1) to discharge.Then, carrying out continuously under the copy situation, after the continuous copy time that the discharge output of charger 104 before duplicating is detected with timer in the duplicating machine 96 slowly descends, remaining on the final discharge output valve of calculating above.
Remove in the electrical equipment 100 before Fig. 9 and Figure 10 represent to duplicate, the discharge of charger 104 output produces the situation of duplicating burst grade and photographic fog before duplicating under above-mentioned control situation.
As shown in Figure 9, according to the light quantity change of cold-cathode tube (PTL) 102 and the change of environment temperature, change the discharge output of charger 104 before duplicating, thereby the electric energy power of removing of removing electrical equipment 100 before will duplicating is adjusted on the setting.By above-mentioned adjustment,, in still copying continuously, can both remain on and not take place to duplicate on the grade of burst, thereby improve duplicating efficiency no matter cold-cathode tube 102 is to be in the initial stage of lighting.
From Figure 10 as seen, the discharge of charger 104 output changes with the use resume of environmental turbulence and photosensitive drum body 12 before duplicating, thereby the electric energy power of removing of removing electrical equipment 100 before will duplicating is adjusted to setting.By above-mentioned adjustment, even under the many wet environments of high temperature, reach photosensitive drum body 12, also can reduce the image photographic fog near its life-span, make high-grade image.
The invention is not restricted to above-mentioned example, can implement all distortion of form within the scope of the present invention.For example, in above-mentioned example,, be not limited to end, also other light source such as available led array though do to remove electric light source with cold-cathode tube.For example, when using led array, by the discharge output of charger before duplicating by the use resume adjustment of environmental turbulence and photosensitive drum body, even when under the many wet environments of high temperature, reaching photosensitive drum body near its life-span, also can be the same with the foregoing description, reduce the image photographic fog, make high-grade image.
For the preceding charger that duplicates that removes before duplicating in the electrical equipment 100, no matter use the DC charger, or the AC charger, can both obtain same action effect.The maximum amount of cold-cathode tube is not limited to 1200lux, can change on demand, and the discharge output by charger before duplicating by the difference adjustment of maximum amount can obtain and above-mentioned same action effect.
The invention is not restricted to analog copying machine, also be applicable to digital copier, other image processing system such as laser printer.Photosensitive drum body is not limited to organic system goods such as above-mentioned OPC cylinder, also can obtain same action effect with the photosensitive drum body of inorganic system.
Removing the electric hand section before duplicating as above detailed description will use with removing electric charger merging except that electric light source, and adjust the discharge output that removes electric charger.Try hard to keep and be held in the regulation grade by adjusting the electric energy that removes that removes the electric hand section before duplicating, thereby it is bad can not produce images such as duplicating burst, image remnants, photographic fog, and the image processing system that can obtain good image is provided.
Claims (15)
1. an image processing system is characterized in that, comprises:
Make the charged means of image-carrier uniform charged;
The sub-image that forms electrostatic latent image on described charged image-carrier forms means;
With developer the electrostatic latent image that is formed on the described image-carrier is carried out video picture, to form the video picture means of developer picture;
Look like to be replicated in the means of duplicating of duplicating material with being formed at developer on the described image-carrier;
Before duplicating described developer, described image-carrier is removed electricity, to reduce removing the electric hand section before the duplicating of Electrostatic Absorption power that described developer looks like to be adsorbed in described image-carrier;
Removing the electric hand section before described the duplicating comprises:
Described image-carrier and developer picture are shone the electric light source that removes that removes electric light;
Described image-carrier is discharged except that electricity, and can change the electric charger that removes of discharge output;
Change the described discharge output that removes electric charger, will remove the control device that electric energy power is adjusted to setting of removing of electric hand section before described the duplicating.
2. image processing system as claimed in claim 1 is characterized in that, the described electric light source that removes contains cold-cathode tube.
3. image processing system as claimed in claim 2, it is characterized in that, described control device is controlled, and according to the described discharge output that removes electric charger of the light quantity variation change of described cold-cathode tube, will be held on the setting except that trying hard to keep except that electric energy of electric hand section before described the duplicating.
4. image processing system as claimed in claim 3 is characterized in that, remove before described the duplicating the electric hand section to remove electric energy power constant.
5. image processing system as claimed in claim 3 is characterized in that, can further comprise the intermission mensuration means of measuring the intermission in the image making,
Described control device is measured the described discharge output that removes electric charger of time change that means are measured according to this intermission.
6. image processing system as claimed in claim 3 is characterized in that, can further comprise the environment measuring means that detected image forms the device environment for use,
Described control device is according to the described discharge output that removes electric charger of the detected environment change of these environment measuring means.
7. image processing system as claimed in claim 3 is characterized in that, can further comprise the resume detection means that the detected image carrier uses resume,
Described control device changes the described discharge output that removes electric charger according to the detected resume of this resume detection means.
8. image processing system as claimed in claim 2 is characterized in that, can further comprise the time detecting means of measuring the image making intermission and detecting the lighting hours of described cold-cathode tube;
Described control device is set the described initial discharge output that removes electric charger according to the detected intermission of described time detecting means, simultaneously from described initial discharge output, increase with the lighting hours of the detected described cold-cathode tube of described time detecting means reduces the described discharge output that removes electric charger, makes to remove the electric hand section before described the duplicating and maintain removing on the electric energy power of regulation.
9. image processing system as claimed in claim 8 is characterized in that, can further comprise:
The temperature detection means of testing environment temperature, and
Measure the resume detection means that described image-carrier uses resume;
Remove the time detecting means that the electric hand section can further comprise the lighting hours of the intermission of detecting described image-carrier and described cold-cathode tube before described the duplicating;
Described control device was removed electric charger and is set initial discharge output described according to the described detected intermission of time detecting means, and from this initial discharge output, increase with the lighting hours of the detected described cold-cathode tube of described time detecting means reduces the described discharge output that removes electric charger, when described temperature detection means detect low temperature environment, the described discharge output that removes electric charger is remained on than discharge output high under the normal temperature environment, when described temperature detection means detect hot environment, the described discharge output that removes electric charger is remained on than discharge output low under the normal temperature environment, according to the testing result of described resume detection means, along with life-span of described image-carrier near reducing the described discharge output that removes electric charger.
10. image processing system as claimed in claim 8 is characterized in that, can further have the temperature detection means of testing environment temperature,
Described control device, when described temperature detection means detect low temperature environment, the described discharge output that removes electric charger is remained on than discharge output high under the normal temperature environment, when described temperature detection means detect hot environment, described discharge output except that electric charger is remained on than discharge output low under the normal temperature environment, make the described preceding predetermined electric energy power of removing of electric hand section maintenance of removing of duplicating.
11. image processing system as claimed in claim 8 is characterized in that, can further have the resume detection means of the use resume that detect described image-carrier,
Described control device, according to the testing result of described resume detection means, along with life-span of described image-carrier near reducing the described discharge output that removes electric charger.
12. an image processing system is characterized in that, comprises:
Make the charged means of image-carrier uniform charged;
The sub-image that forms electrostatic latent image on described charged image-carrier forms means;
With developer the electrostatic latent image that is formed on the described image-carrier is carried out video picture, to form the video picture means of developer picture;
Look like to be replicated in the means of duplicating of duplicating material with being formed at developer on the described image-carrier;
Before duplicating described developer, described image-carrier is removed electricity, to reduce removing the electric hand section before the duplicating of Electrostatic Absorption power that described developer looks like to be adsorbed in described image-carrier;
Removing the electric hand section before described the duplicating comprises:
Described image-carrier and developer picture are shone the cold-cathode tube that removes electric light;
By discharge described image-carrier is removed electricity, and can change the electric charger that removes of discharge output;
With the described discharge output that removes electric charger of the light quantity change change of described cold-cathode tube, be held in the control device of setting with removing trying hard to keep of electric hand section before described the duplicating except that electric energy.
13. image processing system as claimed in claim 12 is characterized in that, can further comprise the time detecting means that detect the described image-carrier intermission.
Described control device is set the described initial discharge output that removes electric charger according to the detected intermission of described time detecting means, simultaneously from described initial discharge output, change the described discharge output that removes electric charger with the change of the light quantity of described cold-cathode tube, make and remove the electric hand section before described the duplicating and maintain removing on the electric energy power of regulation.
14. an image processing system is characterized in that, comprises:
Make the charged means of image-carrier uniform charged;
The sub-image that forms electrostatic latent image on described charged image-carrier forms means;
With developer the electrostatic latent image that is formed on the described image-carrier is carried out video picture, to form the video picture means of developer picture;
Look like to be replicated in the means of duplicating of duplicating material with being formed at developer on the described image-carrier;
Before duplicating described developer, described image-carrier is removed electricity, to reduce removing the electric hand section before the duplicating of Electrostatic Absorption power that described developer looks like to be adsorbed in described image-carrier;
The temperature detection means of testing environment temperature;
Removing the electric hand section before described the duplicating comprises:
Described image-carrier and developer picture are shone the electric light source that removes that removes electric light;
Described image-carrier is discharged except that electricity, and can change the electric charger that removes of discharge output;
Change the described discharge output that removes electric charger according to the detected environment temperature of described temperature detection means, will remove the control device that electric energy power is adjusted to setting of removing of electric hand section before described the duplicating.
15. an image processing system is characterized in that, comprises:
Make the charged means of image-carrier uniform charged;
The sub-image that forms electrostatic latent image on described charged image-carrier forms means;
With developer the electrostatic latent image that is formed on the described image-carrier is carried out video picture, to form the video picture means of developer picture;
Look like to be replicated in the means of duplicating of duplicating material with being formed at developer on the described image-carrier;
Before duplicating described developer, described image-carrier is removed electricity, to reduce removing the electric hand section before the duplicating of Electrostatic Absorption power that described developer looks like to be adsorbed in described image-carrier;
Measure the resume detection means that described image-carrier uses resume;
Removing the electric hand section before described the duplicating comprises:
Described image-carrier and developer picture are shone the electric light source that removes that removes electric light;
Described image-carrier is discharged except that electricity, and can change the electric charger that removes of discharge output;
The result who detects according to described resume detection means changes the described discharge output that removes electric charger, will remove the control device that electric energy power is adjusted to setting of removing of electric hand section before described the duplicating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97118293A CN1188916A (en) | 1996-09-12 | 1997-09-12 | Image formation device with electric remove means before duplicate |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP242089/96 | 1996-09-12 | ||
| CN97118293A CN1188916A (en) | 1996-09-12 | 1997-09-12 | Image formation device with electric remove means before duplicate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1188916A true CN1188916A (en) | 1998-07-29 |
Family
ID=5174729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97118293A Pending CN1188916A (en) | 1996-09-12 | 1997-09-12 | Image formation device with electric remove means before duplicate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1188916A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100585508C (en) * | 2005-02-04 | 2010-01-27 | 柯尼卡美能达商用科技株式会社 | Color image forming apparatus |
| CN101114150B (en) * | 2006-07-26 | 2011-03-30 | 京瓷美达株式会社 | Image forming apparatus |
| CN102043373A (en) * | 2009-10-23 | 2011-05-04 | 京瓷美达株式会社 | Image forming apparatus |
| US10029816B2 (en) | 2010-05-26 | 2018-07-24 | Avery Dennison Retail Information Services, Llc | Pressure sensitive labels for use in a cold transfer method and process for making |
-
1997
- 1997-09-12 CN CN97118293A patent/CN1188916A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100585508C (en) * | 2005-02-04 | 2010-01-27 | 柯尼卡美能达商用科技株式会社 | Color image forming apparatus |
| CN101114150B (en) * | 2006-07-26 | 2011-03-30 | 京瓷美达株式会社 | Image forming apparatus |
| CN102043373A (en) * | 2009-10-23 | 2011-05-04 | 京瓷美达株式会社 | Image forming apparatus |
| CN102043373B (en) * | 2009-10-23 | 2013-05-22 | 京瓷办公信息系统株式会社 | Image forming apparatus |
| US10029816B2 (en) | 2010-05-26 | 2018-07-24 | Avery Dennison Retail Information Services, Llc | Pressure sensitive labels for use in a cold transfer method and process for making |
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