CN1847994A - Electrophotographic image forming apparatus - Google Patents
Electrophotographic image forming apparatus Download PDFInfo
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- CN1847994A CN1847994A CN 200610066796 CN200610066796A CN1847994A CN 1847994 A CN1847994 A CN 1847994A CN 200610066796 CN200610066796 CN 200610066796 CN 200610066796 A CN200610066796 A CN 200610066796A CN 1847994 A CN1847994 A CN 1847994A
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Abstract
An image forming apparatus includes an image bearing member on which an electrostatic latent image is capable of being formed; a developer accommodating container for accommodating a developer for developing the electrostatic latent image; a detecting device for detecting a remaining amount of the developer in the developer accommodating container, wherein the detecting device detects the remaining amount during a period in which no image forming operation is performed; a developer feeding member for feeding and stirring the developer in the developer accommodating container, the developer stirring member being rotatable at a speed which is lower during detection of the remaining amount than when an image forming operation is performed, wherein the detecting device detects first, second and third developer remaining amounts in first, second and third remaining amount detecting periods, respectively, in the order named, and wherein an interval between the second detection period and the third detection period is changed on the basis of the first and second remaining amounts.
Description
Technical field
The present invention relates to a kind of electrophotographic image forming apparatus, this equipment has the surplus developer pick-up unit that is used for detecting the remaining developer level of the developer reservoir of wherein storing developer.
Here, electrophotographic image forming apparatus is meant the equipment that utilizes the electric photographic imaging method to form image on recording medium.The example of electrophotographic image forming apparatus comprises electricity photography duplicating machine, electrographic printer (for example laser beam printer, LED printer etc.), facsimile recorder etc.
Background technology
Adopt the electrophotographic image forming apparatus of the electric photographic imaging technology of prior art to use process cartridge system, according to this system, be arranged on integratedly in the box that can be removably mounted in the electrophotographic image forming apparatus master component as the cydariform electric camera photosensitive member (hereinafter referred to as photosensitive drums) of image-bearing member and one or more processing element of processing photosensitive drums.
An example of above-mentioned processing element is developing apparatus or analog, the sub-image that they form on above-mentioned photosensitive drums with developer development (toner).Process cartridge system can make the user safeguard electrophotographic image forming apparatus, and needn't seek help from the attendant, thereby has improved the work efficiency of electrophotographic image forming apparatus.Therefore, process cartridge system is widely used in the electrophotographic image forming apparatus field.
As for the time of changing handle box, usually, after the toner-out of its stored, handle box will be changed.In addition, when the toning dosage in the handle box drops to when being lower than certain level, the life-span that the user can be apprised of handle box soon is through with, thereby urges the user to change handle box.
Toner excess detection method according to the transmittance type of prior art is described now.
The developer reservoir of storage toner, promptly toner container is provided with the toner agitating member, while this member sends the toner in the toner container to feed rolls by rotating agitation of toner.
The toner container of wherein storing toner is provided with a pair of light-transmissive window: top and bottom light transmission window.The bottom light transmission window imports toner container to light from light source, light source be arranged on the imaging device master component such as light emitting diode (LED) or analog.The top light transmission window is the window that constitutes optical channel, and its photoconduction that imports toner container via bottom windows is to the luminous flux detection sensor, and this sensor for example is a photistor, is arranged on inner different with the light source position of imaging device master component.
The bottom light transmission window is positioned at below the rotating shaft of agitating member, and the top light transmission window then is positioned at above the rotating shaft of agitating member.When each agitating member rotated, it will form with the top light transmission window with the bottom and contact, wiping at the toner that sticks on each window inboard.When the toning dosage in the cleaning range of agitating member reduced owing to toner consumption, light can see through toner container and arrive the top light transmission window from the bottom light transmission window, thereby can detect the toner surplus.
Known, the light transmissive is crossed between the time span of toner container and is had a kind of relation in the every full process of rotating once of toning dosage in toner container and agitating member.This fact is used for detecting continuously the toner surplus of toner container.In this case, the cleaning of bottom and top light transmission window is important.It is also important that after agitating member cleaned window, near the toner main body the bottom light transmission window covered the mode of bottom light transmission window once more, and has stable relations between the toner surplus in the toner container.
Therefore, at the size and the mode of cleaning range, proposed various suggestions and designed agitating member.
Summary of the invention
The present invention relates to the imaging device that a kind of use-case such as above-mentioned this method detect surplus developer.Fundamental purpose of the present invention is the surplus developer that detects in the developer reservoir, the time of detecting makes accurately detects developer level in the developer reservoir under the situation of the operational forces that needn't reduce imaging device, this imaging device detects surplus developer when not carrying out imaging, and reduces the velocity of rotation of its developer agitating member when detecting surplus developer.
Come in conjunction with the accompanying drawings with reference to the following explanation to the preferred embodiment of the present invention, these and other purpose of the present invention, characteristics and advantage can become clearer.
Description of drawings
Fig. 1 is the schematic sectional view of the electrophotographic image forming apparatus in the first embodiment of the invention, expresses its basic structure.
Fig. 2 is the cut-open view of the handle box in the first embodiment of the invention, expresses its basic structure.
Fig. 3 is the skeleton view of an imaging device master component and a handle box, expresses handle box and is installed into mode in the master component.
Fig. 4 is the part of imaging device master component and the side view of a handle box, expresses handle box and is installed into mode in the master component.
Fig. 5 is the part of imaging device master component and the part perspective side elevation view of a handle box, expresses handle box and is installed into mode in the master component.
Fig. 6 is one of photosensitive drums bearing and near side view thereof, expresses the mode that the drum bearing is located with respect to the imaging device master component when handle box is installed in the equipment master component.
Fig. 7 is the cut skeleton view of handle box part, the optical channel that is passed through when expressing the beam propagation that detects surplus developer.
Fig. 8 expresses the chart that toner surplus and light beam can see through the relation between the time span of toner container.
Fig. 9 is the process flow diagram of the toner surplus detection order in the first embodiment of the invention.
Figure 10 is the process flow diagram of the toner surplus detection order in another embodiment of the present invention.
Figure 11 is the block diagram of toner surplus detection part, expresses luminous component, light accepting part branch and controller.
Embodiment
Below, with reference to the electrophotographic color image forming apparatus of accompanying drawing detailed description as electrophotographic image forming apparatus embodiment of the present invention.These embodiment described below are in order more specifically to describe the present invention.Unless special declaration is arranged, the size of the structural detail of below listing, material and shape and their position relation etc. and not meaning that limit the scope of the invention.
Embodiment 1
(basic structure of imaging device)
The basic structure of electricity photography polychrome imaging device among this embodiment at first, is described with reference to Fig. 1.
Electricity photography polychrome imaging device shown in the figure has four handle box supports 8 (8a, 8b, 8c and 8d), and these supports are vertically stacked abreast, and handle box 7 (7a, 7b, 7c and 7d) wherein is installed respectively.These handle boxes are respectively equipped with the electric camera photosensitive member of cydariform, i.e. photosensitive drums (image-bearing member) 1 (1a, 1b, 1c and 1d).
Each photosensitive drums 1 is driven along the counter clockwise direction among Fig. 1 rotationally by the driver part (not shown).Near the circumferential surface of photosensitive drums 1, with cited order following structural detail is set according to the rotation direction of photosensitive drums 1.
They are: charging unit 2 (2a, 2b, 2c and 2d) is used for the circumferential surface uniform charging (one to one) to photosensitive drums 1; Scanner unit 3 (3a, 3b, 3c and 3d) is used for by the projection laser beam and with image-forming information laser beam is modulated simultaneously and form electrostatic latent image one to one on the circumferential surface of photosensitive drums 1; Developing cell 4 (4a, 4b, 4c and 4d) has developing parts, is used to use the toner as developer to come developing electrostatic latent image; Static printing parts 5 are used for the toner image on the photosensitive drums 1 is transferred to a recording medium S (being designated hereinafter simply as recording medium S); And cleaning member 6 (6a, 6b, 6c and 6d), be used for removing one to one remaining toner on the circumferential surface of photosensitive drums 1.
Each photosensitive drums 1 and corresponding charging unit 2, developing cell 4 and cleaning member 6 are arranged in the box integratedly, form handle box 7.Handle box 7 among this embodiment is made of photosensitive-member unit 50 independent of each other and developing cell 4.Photosensitive-member unit 50 by photosensitive drums 1, charging unit 2, cleaning member 6 with and on above-mentioned element is installed framework (first framework) constitute, developing cell 4 then by developing parts with and on developing parts is installed framework (second framework) constitute.
Photosensitive drums 1 is made of aluminum barrel, and for example, its diameter is 30mm, is applying organic photosensitive layer (photographic layer that is formed by OPC) on the circumferential surface of aluminum barrel.Photosensitive drums 1 by a pair of supporting member rotatably support at vertical end.Biography is delivered to one of vertical end of photosensitive drums 1 from the driving force of motor (not shown), and photosensitive drums 1 is rotatably driven in the counterclockwise direction thus.
With reference to Fig. 2, the charging unit that uses contact-type is as charging unit 2; Charging unit 2 is conductive rollers forms, i.e. charging roller, and its circumferential surface with photosensitive drums 1 contacts setting.Charging roller 2 is applied in the charging bias voltage, with the circumferential surface uniform charging to photosensitive drums 1.
Scanner unit 3 (3a, 3b, 3c and 3d) roughly is arranged on the level identical with corresponding photosensitive drums 1.A branch of imaging penetrates from the laser diode of each scanner unit 3, modulates the corresponding polygon mirror 9 (9a, 9b, 9c or 9d) that directive is rotated by the scanner electric (not shown) simultaneously with visual signal.By the imaging beam of polygon mirror 9 deflections by the many points on the circumferential surface that charges of focus lens 10 (10a, 10b, 10c or the 10d) photosensitive drums of exposing selectively 1, thereby form the electrostatic latent image of reaction visual signal.
With reference to Fig. 1, each developing cell 4 has developer reservoir 41 and developing cell framework 46.Developer reservoir 41 holds toner, and the toner in the developer reservoir 41 of its color and other developing cell 4 is different.In other words, the developer reservoir 41a of storage Yellow toner is arranged, store the developer reservoir 41b of cyan toner, store the developer reservoir 41c of magenta toner, store the developer reservoir 41d of black toner in addition.
Referring again to Fig. 2, the toner T that is stored in each developer reservoir 41 (41a, 41b, 41c and 41d) delivers to feed rolls 44 by first and second agitating members 42 and 43 that are arranged on as the toner agitating member in the developer reservoir 41.
Near feed rolls 44, be provided as the developer roll 40 of developer bearing member.Developer roll 40 bearing developers become developer image (toner image) with the latent electrostatic image developing on the photosensitive drums 1, i.e. the image that is formed by developer (toner).Being arranged on equally in the developer reservoir 41 is developer sheet 45, and this sheet keeps by on the circumferential surface that is pressed in developer roll 40.Toner in the developer reservoir 41 is coated on the circumferential surface of developer roll 40 by feed rolls 44 and developer sheet 45, is applied in electric charge simultaneously.Thereby owing to apply the development bias voltage to developer roll 40, the electrostatic latent image that forms on the photosensitive drums 1 is developed.Incidentally, the circumferential surface that is arranged so that developer roll 40 of developer roll 40 is directly relative with the circumferential surface of photosensitive drums 1.
With reference to Fig. 1, imaging device 100 is provided with static printing band 11 equally, with all photosensitive drums 1 (1a, 1b, 1c and 1d) ring-type operation when keeping in touch.Recording medium S is sent to transfer position by transfer belt 11, and in this position, the toner image on the photosensitive drums 1 is transferred on the recording medium S.
What Reference numeral 16 was represented is to send in the imaging device master component recording medium S and the part of giving imaging moiety.More particularly, a plurality of recording medium S are stored in the paper feeding box 17.When imaging equipment carries out imaging operation, paper-feed roll 18 and pair of registration rollers 19 are driven synchronously rotationally by the process with imaging operation, thereby the recording medium S in the paper feeding box 17 is being sent in the imaging device master component one by one discretely simultaneously, and continued to be fed into master component.Each recording medium S is transmitted, and alignment roller 19 is reached with that up to its front end to contact.Reach when contacting when the front end of recording medium S and alignment roller 19, it temporarily is aligned roller 19 there and keeps.Then, by alignment roller 19 releases synchronous, and continue to deliver to transfer belt 11 by alignment roller 19 with the ring-type operation of transfer belt 11.
Afterwards, recording medium S is discharged from the imaging device master component by recording medium outlet 24 by a pair of distributing roller 23.
(handle box)
Below, with reference to Fig. 2 and 3, description can be installed in the handle box 7 (7a, 7b, 7c and 7d) among this embodiment among the imaging device master component A.
Incidentally, the handle box 7c of the handle box 7b of the handle box 7a of storage Yellow toner, storage cyan toner, storage magenta toner is identical with the structure of the handle box 7d of storage black toner.Fig. 2 be handle box 7 (7a, 7b, 7c and 7d) along with the cut-open view on the vertical vertical plane of handle box 7.
As for photoconductive drum unit 50, photosensitive drums 1 is installed in rotation on the cleaning member framework 51, and bearing 31 (31a and 31b) (Fig. 3) is arranged between photosensitive drums 1 and the cleaning member framework 51.Near the circumferential surface of photosensitive drums 1, be provided for the charging roller 2 of photosensitive drums 1 circumferential surface uniform charging and be used to remove the cleaning plate 60 that remains in the toner T on photosensitive drums 1 circumferential surface.When remaining toner or remain on when the toner on the circumferential surface is removed by the circumferential surface on photosensitive drums 1 on the photosensitive drums 1, it is delivered to the used toner chamber 51a that is positioned at cleaning member framework 51 rear portions by toner connecting gear 52.Simultaneously, photosensitive drums 1 is driven rotationally with counter clockwise direction in scheming, and is synchronous with the process of imaging operation.
Developing cell 4 is provided with: as the developer roll 40 of developer bearing member, rotate along the direction shown in the arrow W when keeping in touch with photosensitive drums 1; The developer supply case 41 of storage toner; And developing cell framework 46.Developer roll 40 is by developing cell framework 46 rotatably supports, wherein the bearing (not shown) that is provided with between developer roll 40 and the developing cell framework 46.Near developer roll 40, be arranged on the feed rolls 44 of on direction shown in the arrow Z, rotating when keeping in touch and as the developer sheet 45 of developer adjustment means with developer roll 40.
In addition, in developer reservoir 41, first and second agitating members 42 and 43 are set, are used in agitation of toner toner sent to feed rolls 44.
With pin 49 developing cell 4 is installed on the photoconductive drum unit 50, just as developing cell 4 integral body hang on the photoconductive drum unit 50, thereby it is pivotly around pin 49 motions.Before handle box 7 is installed in the imaging device master component 100, developer roll 40 is kept by being pressed on the photoconductive drum unit 50 by compression spring 55, thereby makes the moment on the direction that developing cell 4 rotates around the pin 49 as the developing cell bolster that developer roll 40 produces by spring 55 and keep in touch with photosensitive drums 1.
In development operation, the toner in the developing cell 4 is passed to feed rolls 44 by first and second agitating members 42 and 43.When toner was passed to feed rolls 44, toner just was carried on the circumferential surface of the feed rolls 44 of rotating with direction shown in the arrow z in scheming.As a result, the toner on the feed rolls 44 is transferred on the developer roll 40, thereby when developer roll 40 that feed rolls 44 friction is being rotated with direction shown in the arrow W in scheming, toner becomes and is carried on the developer roll 40.
When developer roll 40 rotated, the toner that is carried on the developer roll 40 arrived developer sheet 45, and this sheet is regulated the toner on the developer roll 40, thereby formed the skim toner of predetermined thickness on the circumferential surface of developer roll 40.When developer roll 40 was rotated further, that skim toner arrived the development part, that is, and and the zone that photosensitive drums 1 and developer roll 40 contact with each other.In the development part, by being applied to development bias voltage on the developer roll 40 (it is dc voltage) from the power supply (not shown), toner sticks on the electrostatic latent image on photosensitive drums 1 circumferential surface; In other words, electrostatic latent image is developed by dc voltage.When developer roll 40 is rotated further, remain on the toner on the circumferential surface of developer roll 40, it is the toner that is not used to develop on the developer roll 40, return developing cell framework 46, toner separates from developer roll 40 therein, in the zone that developer roll 40 and feed rolls 44 rub each other, thereby turn back to developing cell framework 46.First and second agitating members 42 and 43 mix the toner that returns with toner in the developing cell framework.
Under the situation of this contact-type developing method, wherein by developer roll 40 is contacted setting with photosensitive drums 1 circumferential surface, the sub-image on the photosensitive drums of developing 1 wish that photosensitive drums is a rigid member, and developer roll 40 is the rollers with elastic layer in as this embodiment.About the elastic layer of developer roll 40, consider will for the developer roll 40 of toner charging the function that should have, flat solid rubber layer or be coated with resin or the solid rubber layer of analog is desirable.
With reference to Fig. 3 and 4, in order correctly handle box 7 to be installed among the imaging device master component 100A, handle box 7 will be along handle box guide 25 from being inserted by the direction shown in the arrow Y the equipment master component 100A, thereby make the bearing 31 (31a and 31b) of supporting photosensitive drums 1 fit into guiding groove 34 (34a, 34e respectively; 34b, 34f; 34c, 34g; And 34d, 34h).
Below, with reference to Fig. 6, when continuing to insert handle box 7, each bearing 31 is reached with the bearing composition surface 37 and 38 (drum bearing locating surface) of guiding groove 34 and is contacted, and handle box 7 is located with respect to equipment master component 100A exactly.As for handle box 7 position in the vertical, up to the final stage that box inserts, handle box 7 roughly keeps the location with respect to equipment master component 100A under the effect of the longitudinal terminal surface of the guiding elements 25 of equipment master component and handle box 7.Then, the final stage of inserting at box, under the effect of pressing component (not shown), the localization part of the end face of drum unit on the direction vertical with the sidewall of imaging device master component 100A by the presumptive area that is pressed in imaging device master component 100A on.As a result, handle box 7 is accurately located with respect to equipment master component 100A in the vertical.
As for the method that handle box 7 is accurately positioned among the imaging device master component 100A, use the scheme shown in Fig. 5 on cross-wise direction.
That is to say that each in the side plate 32 on the left side and the right all is provided with axle 39, it is pressed by volume and is installed on the side plate 32.Axle 39 with reverse disc spring 30 and cooperate, an end 30a who reverses disc spring 30 fits among the hole 32a of corresponding side plate 32.Before handle box 7 is installed among the imaging device master component 100A, reverse of the protuberance 32b maintenance of the bulging bearing localization part (that relative end of end of assembling among its above-mentioned hole 32a) of disc spring 30, on the expansion direction of disc spring 30, rotate to prevent it by respective side panels 32 for spring 30 and side plate 32.When handle box 7 inserts imaging device master component 100A, reverse the bulging bearing localization part of disc spring 30 and push by the bulging bearing of handle box 7, reverse disc spring 30 elasticity and rotate in the clockwise direction thereby supporting.Slide on bearing 31 as long as reverse the downward localization part of the bulging bearing localization part of disc spring 30, it enters the position shown in Fig. 5 with regard to bullet, the localization process box 7 exactly by push bearing 31 on the direction shown in the arrow F.
Below, with reference to Fig. 2 and 7-9, principal character of the present invention is described, promptly, pass the method that toner container detects developer (toner) surplus in the toner container by a branch of light of transmission, and pass the structure that toner container detects developer (toner) surplus by a branch of light of transmission.
(according to light transmissive duration detection toner surplus)
With reference to Fig. 2,, be provided with developer roll 40, feed rolls 44 and first and second agitating rollers 42 and 43 at the developer reservoir 41 that is used for storing toner T.The more close feed rolls 44 of first agitating member, 42 to the second agitating members.Agitating member 42 rotates with identical speed with 43, is provided with the phase differential of scheduled volume simultaneously between the rotation of two agitating members 42 and 43.When two agitating members 42 and 43 rotated as described above, toner T was sent to feed rolls 44.Along with the continuation consumption of toner, the amount of the toner T in the developer reservoir 41 finally reduces near the circumferential surface that just enough fills up feed rolls 44 and near the amount the bottom of first agitating member 42, as shown in Figure 2.
With reference to Fig. 2 and 7, the developer reservoir 41 of storage toner T is provided with a pair of light- transmissive window 54A and 54B, and it constitutes a part of toner surplus pick-up unit 200.More specifically, bottom light transmission window 54A is positioned at below the axis of first agitating member 42, and top light transmission window 54B be positioned at 42 rotating shafts of first agitating member above.The structure of two light- transmissive window 54A and 54B makes them inner outstanding to developer reservoir 41 slightly.This is to the parts of light- transmissive window 54A and 54B formation optical channel, and a branch of light is by this optical channel transmission, to detect the amount of toner T residual in the developer reservoir 41.
When first agitating member 42 rotated, page or leaf sheet part 42a friction-top and the bottom light transmission window 54B and the 54A of first agitating member 42 removed the toner T that sticks on window 54B and the 54A inboard.
As for pick-up unit 200 using method among this embodiment, from sending a branch of light (this bundle light L is hereinafter referred to as detecting light L) by the luminous component of making by light emitting diode (LED) or analog 62 that is installed on the imaging device master component 100A.Detect light L transmission by bottom light transmission window 54A and top light transmission window 54B, arrive the light accepting part of being made by photistor or analog and divide 63, light accepting part divides 63 Acquisition Detection light L.Light accepting part divides 63 to be installed on the imaging device master component 100A.
The amount of toner T in the developer reservoir 41 and detect the relation of light L between can the time span t of transmission developer reservoir 41 as shown in Figure 8.The amount of toner T in the developer reservoir 41 is few more, and light accepting part divides the time span (transmittance duration) of 63 received detection light L long more; The amount of toner T in the developer reservoir 41 is many more, and light accepting part divides the time span (transmittance duration) of 63 received detection light L short more.In other words, light accepting part divides the amount of toner T residual in the time span of 63 received detection light L and the developer reservoir 41 to be inversely proportional to.CPU utilizes the reaction light accepting part to divide the signal of the duration of 63 received these detection light to calculate the surplus (number percent) of toner.Here, the number percent of toner surplus is meant the number percent of toner surplus with respect to toning dosage (100%) initial in the developer reservoir 41, and described initial toning dosage i.e. the amount of the toner T in the developer reservoir 41 when developer reservoir 41 is full of.
Incidentally, in recent years, the electrophotographic image forming apparatus master component all was significantly increased in every year aspect the printing speed (processing speed).Because the raising of processing speed, the amount of supplying with the toner of developer roll also improves accordingly.So the velocity of rotation of agitating member also has been set on the faster speed that is directly proportional with the processing speed that improves.The raising of agitating member velocity of rotation has influence on the time span that above-mentioned detection light can the transmission toner container, because the flowability of the toner that the change of agitating member velocity of rotation influence is stirred in toner container.
That is to say that when the rotating speed of toner agitating member was low, toner not too was stirred, thereby it is less that air is sneaked into the amount of toner, causes the toner flowability lower.On the contrary, when the rotating speed of toner agitating member was higher, the toner in the toner container was stirred more continually, so relatively large air is sneaked in the toner, and height when the flowability that causes toner is lower than the rotating speed of toner agitating member.
As long as the lip-deep toner main body of light-transmissive window is removed from window, it is just got back on the window and covers it once more.Should operate, mobile low toner main body is relatively stable compared with the high toner main body of flowability.Thereby when the rotating speed of toner agitating member is slow, that is, when the flowability of the toner in the toner container was low, it was comparatively stable to detect the time span that light can the transmission toner container, thereby can detect the toner surplus in the toner container exactly.
On the other hand, when toner main body mobile high, its unstable properties.So after the page or leaf sheet of toner agitating member partly cleaned the surface of light-transmissive window, it covered light-transmissive window apace once more.Therefore, it is not only shorter to detect the time span that light can the transmission toner container, and unstable, thereby can not detect the toner surplus in the toner container exactly.
Therefore, in this embodiment,, before the toner surplus that begins to detect in the toner container, reduce the rotating speed of toner agitating member in order to address the above problem.In other words, when hanging down, the flowability of toner surplus detects the toner surplus.Yet, must supply with the toner of developer roll scheduled volume continuously.Thereby in order to guarantee to be continuously the toner of developer roll supply scheduled volume, the toner surplus in the toner container must not be to detect in the period of carrying out imaging really.
In addition, need the regular hour to detect the toner surplus.So, if frequently detect the toner surplus, that is, reducing if detect the length at the interval of toner surplus, the yield-power of imaging device will reduce.Thereby, must set the moment of detecting the toner surplus, with the reduction that prevents that the imaging device yield-power is meaningless.
On the contrary, increase excessively, can produce following problem if detect the length at the interval of toner surplus.That is, if in each interval procedure that the toner surplus detects, the toning dosage that imaging consumes is very big, by given toner surplus detecting operation toner surplus that detects and the result who is detected by last toner surplus detecting operation a great difference is arranged.So, may miss the Best Times that detects the toner loss.
If no matter the loss of toner and continue to print operation, owing between the time that the time and the user of toner loss is apprised of the toner loss, delay is arranged, so may produce defective image.In addition, the user may miss the best opportunity of changing handle box.
Therefore, in this embodiment, consider above-mentioned reason, detect the program of the toner surplus in the toner container with such interval, that is, these length and consumption of toner at interval are inversely proportional to.
(surplus trace routine)
In this embodiment, be not the period of carrying out imaging really the period of detecting toner surpluses (with percentage calculation) by the toner surplus checkout equipment 200 of transmittance type.More specifically, detect the toner surplus when imaging operation finishes, the accumulated time length that developer roll rotates in this process reaches predetermined value.
Here, " imaging operation " is meant that the toner T with carrying on the developer roll 40 makes the operation of the latent electrostatic image developing that forms on photosensitive drums 1 circumferential surface, described electrostatic latent image is by the circumferential surface with beam of laser exposure (scanning) photosensitive drums 1, with image-forming information light beam is modulated simultaneously to form.When " when carrying out imaging really " is meant electrostatic latent image on the toner T development photosensitive drums 1 of carrying on developer roll, and " when not carrying out imaging really " is meant the period that is not to carry out really imaging, in other words, be when the electrostatic latent image on the photosensitive drums 1 is not developed.And, imaging device is set, make that when the accumulated time length of developer roll 40 rotations reached predetermined value Ts, the counter of the accumulated time length that developer roll 40 rotates was reset, with the time span of the accumulation developer roll rotation of starting from scratch.
The reason that will detect the toner surplus why when not having imaging is, different when carrying out imaging really, when not carrying out imaging, can set the velocity of rotation of the first lower agitating member, because when not carrying out imaging really, can not take place owing to the toner quantity not sufficient of supplying with developer roll 40 enough forms defective image.In this embodiment, when certain imaging, the speed setting of first agitating member 42 is about 60rpm, and when detecting the toner surplus, is set at about 30rpm, that is, be form really first agitating member that image sets period rotating speed 1/2.
By in order to detect the rotating speed that the toner surplus reduces by first agitating member, can reduce the flowability of the toner in the developer reservoir 41.Reduce because toner is mobile, after page or leaf sheet part 42A cleaning light-transmissive window surface as actual toner mixing part, it is more stable that toner covers the used time span of light-transmissive window once more, so, detect the time span that light can transmission developer reservoir 41 and keep comparatively stable, thereby before not reducing compared with the toner flowability, can detect the toner surplus in the developer reservoir 41 exactly.
In addition, in this embodiment, the program that is used to detect the toner surplus in the developer reservoir is provided with two referential data Ts, and accumulated time length and this two referential datas that developer roll 40 rotates compare, and change the length of toner surplus assay intervals with the consumption according to toner.Owing to used this scheme, if the consumption of toner of given imaging operation is higher, that is, if the toner surplus reduces morely, to carry out program next time between the interval can shorten, reason is as follows.That is, if higher for the consumption of toner that detects the imaging operation that the toner surplus interrupts, in the time of can expecting that the imaging operation that interrupts restarts, the consumption of toner of the residual fraction of the imaging operation of interruption is higher.Yet, if the consumption of toner of the remainder of imaging operation just than the expectation low, that is, if the amount of the residual minimizing of toner is less, to the gap length that next time carries out procedure time reduce can switch back raw value; In other words, length at interval can increase, and reason is as follows.That is, if for the consumption of toner that detects the imaging operation that the toner surplus interrupts is lower, in the time of can expecting that the imaging operation that interrupts restarts, the consumption of toner of the residual fraction of the imaging operation of interruption is lower.By using above-mentioned control method, can not take place owing to detect the reducing to cause and unnecessarily be lowered into picture device fabrication power of length at the interval of toner surplus.
In this embodiment, normal referential data Ts1 is 220 seconds (Ts1), and referential data Ts2 is 120 seconds (Ts2), the accumulated time length that developer roll rotates compares the program that begins to be used to detect the toner surplus to interrupt ongoing imaging operation when ongoing imaging operation finishes with referential data Ts1, and the accumulated time length of developer roll 40 rotations and referential data Ts2 compare the length with the interval that reduces to carry out program.
The method that is used to detect consumption of toner among this embodiment is described now.That is the difference between the toner surplus (with the number percent form) that detects of two toner surplus trace routines that obtain to carry out continuously.
Then, if this difference is greater than predetermined threshold N (being 7% among this embodiment), determine that ongoing imaging operation is the high imaging operation of consumption of toner, and select referential data Ts2 (being 120 seconds among this embodiment) as the numerical value of comparing with the accumulated time length that developer roll 40 rotates, to trigger toner surplus trace routine.In other words, reduce toner surplus assay intervals.If above-mentioned difference becomes just less than predetermined threshold M, this numerical value different with predetermined threshold N (M is 4% in this embodiment), determine that ongoing imaging operation is the little imaging operation of consumption of toner, and referential data Ts reverted to numerical value Ts1 (being 220 seconds in this embodiment), that is, increase the length of toner surplus assay intervals.
Below, with reference to the process flow diagram among Fig. 9, the order of the toner surplus that is used for detecting toner container among this embodiment is described:
S1: in initial procedure beginning toner surplus detect (after opening imaging device, carry out immediately, perhaps when the replacing handle box or handle paperboard or the problem of analog after carry out immediately after the protecgulum of closing device master component).
S2:, carry out toner surplus trace routine to calculate toner surplus Q according to detecting the time span that light can see through toner container
(n)(number percent form).The toner surplus of calculating is stored among the CPU of imaging device (, n represents the number of times of repetitive routine, and is reset when carrying out initialization procedure at every turn) here.
S3: beginning imaging operation.
S4: when accumulated time length that developer roll rotates reaches numerical value TS1 in 200 seconds to 240 seconds scopes, stop imaging operation.In this embodiment, when the accumulated time length of developer roll rotation reached 220 seconds (Ts1), imaging operation stopped.
S5: beginning toner surplus detects.
S6:, carry out toner surplus trace routine to calculate toner surplus Q according to detecting the time span that light can see through toner container
(n)(number percent form).The amount of calculating is stored among the CPU of imaging device.
S7: if Q
(n)-Q
(n-1)〉=N (=7), that is, if the consumption of toner height carries out step S8.If Q
(n)-Q
(n-1)＜N promptly, if consumption of toner is low, carries out step S3.Here, N represents to be used to estimate the threshold value of consumption of toner.
S8: beginning imaging operation.
S9: when accumulated time length that developer roll rotates reaches numerical value Ts2 in 100 seconds to 140 seconds scopes, stop imaging operation.In this embodiment, when the accumulated time length of developer roll rotation reached 120 seconds (Ts2), imaging operation stopped.
S10: beginning toner surplus detects.
S11:, carry out toner surplus trace routine to calculate toner surplus Q according to detecting the time span that light can see through toner container
(n)(number percent form).The amount of calculating is stored among the CPU of imaging device.
S12: if Q
(n)-Q
(n-1)〉=M (=4), that is, if the consumption of toner height carries out step S8, wherein assay intervals keeps shortlyer.If Q
(n)-Q
(n-1)＜M promptly, if consumption of toner is low, carries out step S3, and wherein assay intervals increases.Here, M represents to be used to estimate another threshold value of consumption of toner.
In this embodiment, be used to detect the said procedure of toner surplus.In other words, if determine that the consumption of toner of given imaging operation is higher, just reduce the length of toner surplus assay intervals, to reduce the change of consumption of toner (with the number percent form) as wide as possible.So,, also can detect the toner surplus exactly even under the high situation of the consumption of toner of imaging device.In addition, if consumption of toner reduces after the length of assay intervals reduces, changeable time initial length of the length of following assay intervals promptly, can increase length at interval.So, can detect the toner surplus exactly, and needn't reduce the yield-power of imaging device.
Incidentally, the threshold value N that is used to estimate consumption of toner and M, be used for comparing with the accumulated time length of the rotation of developer roll with the numerical value Ts1 that triggers toner surplus trace routine and Ts2 and when accurately forming image agitating member velocity of rotation and when the detection toner surplus velocity of rotation of agitating member only need be selected as being well-suited for ideal image most and operate selected imaging device.
In addition, the present invention also can be used for not using the electrophotographic image forming apparatus of process cartridge system.Those effects that imaging device obtained among the effect that the present invention is applied to this imaging device and this embodiment are identical.
The electrophotographic image forming apparatus of another embodiment of the present invention will be described below.
Electrophotographic image forming apparatus 100 and handle box 7 among this embodiment are characterised in that, except determining consumption of toner with the used method of the length that changes toner surplus assay intervals according to consumption of toner, those among they and first embodiment are basic identical.Among this embodiment with first embodiment in those are similar.In this embodiment, change the length at the interval of detecting the toner surplus according to imaging operation.More specifically, change according to the printing percentage in the imaging operation.
Because electrophotographic image forming apparatus 100 among this embodiment and handle box 7 are substantially the same with among first embodiment those, so repeat no more their detailed description here.And, in this embodiment, the velocity of rotation that makes agitating member when detecting the toner surplus slow than the time when certain carrying out.
Electrophotographic image forming apparatus 100 among this embodiment is provided with controller 300 (Fig. 1 and 11), is used for coming process information (printed information) according to the image that forms.Controller 300 can determine whether the length of toning dosage assay intervals should reduce or keep normal.More specifically, it determines printing percentage by the information of input, then, calculates consumption of toner to determine whether length at interval should reduce or keep normal.With reference to block diagram 11, controller 300 is connected to luminous component 62 and light accepting part divides 63.Thereby, by luminous component 62 and light accepting part divide 63 in conjunction with the above-mentioned signal input controller 300 that produces.
More specifically, if the image-forming information (printed information) of input shows that printing percentage is not less than P% (being 35% among this embodiment), in other words, if controller 300 has determined that at the imaging operation that carries out be the big imaging operation of consumption of toner, the gap length that the toner surplus of carrying out to the back to back next one detects reduces.That is, when the accumulated time length of the rotation of developer roll 40 reaches numerical value Ts2 (being 120 seconds among this embodiment), carry out next trace routine.If the image-forming information (printed information) of input shows that printing percentage is not more than P% (being 35% among this embodiment), in other words, if controller 300 determines to be the little imaging operation of consumption of toner at the imaging operation that carries out down, the gap length during to the toner surplus detection carried out next time switches back normal length.That is, when the accumulated time length of the rotation of developer roll 40 reaches numerical value Ts1 (being 220 seconds among this embodiment), carry out next trace routine.
Below with reference to flow process Figure 10 toner surplus trace routine among this embodiment is described:
S1: the controller of printed information being imported imaging device.
S2: controller determines that whether printing percentage is less than P%.If be not less than P%, carry out step S3.If be not more than P%, carry out step S7.Here, P represents to be used to estimate the threshold value of consumption of toner.
S3: beginning imaging operation.
S4: when accumulated time length that developer roll rotates reaches numerical value TS1 in 100 seconds to 140 seconds scopes, stop imaging operation.In this embodiment, the accumulated time length of rotating when developer roll reaches 120 seconds when (Ts1=120 second), and imaging operation stops.
S5: toner surplus trace routine begins.
S6:, carry out toner surplus trace routine to calculate toner surplus Q according to detecting the time span that light can see through toner container
(n)(number percent form).The amount of calculating is stored among the CPU of imaging device.
S7: beginning imaging operation.
S8: when accumulated time length that developer roll rotates reaches numerical value Ts1 in 200 seconds to 240 seconds scopes, stop imaging operation.In this embodiment, the accumulated time length of rotating when developer roll reaches 120 seconds when (Ts2=120 second), and imaging operation stops.
S9: beginning toner surplus detects.Then, carry out step S5.
In this embodiment, be used to detect the said procedure of toner surplus.In other words, if determine that the consumption of toner of given imaging operation is bigger, just reduce toner surplus assay intervals length, to reduce the change of consumption of toner (with the number percent form) as wide as possible, this occurred in the interim of next time carrying out trace routine.So,, also can detect the toner surplus in ground even under the big situation of the consumption of toner of imaging device.In addition, if after assay intervals length reduces, consumption of toner descends, and next assay intervals length can be switched back initial length, and promptly it can increase length.So, can detect the toner surplus exactly, and can not be lowered into picture device fabrication power meaninglessly.
Incidentally, in a second embodiment, suppose that many compositions of all inputs are identical as the printing percentage of information.Yet the image information group can always not have identical printing percentage.Thereby if the different image information group of a plurality of printing percentage is transfused to identical imaging operation, printing percentage the highest in the various printing percentages of the image-forming information group of being imported can be used as above-mentioned threshold value.For example, if import one group of printing percentage together is image-forming information and one group of image-forming information that printing percentage is 80% (high printing percentage) of 20% (low printing percentage), the consumption of toner of supposing ongoing imaging operation is big (selects 80% the printing percentage printing percentage as ongoing imaging operation, so, reduced the length of assay intervals.
Be used to estimate consumption of toner threshold value P, as the numerical value of quilt reference with the numerical value Ts1 that triggers toner surplus trace routine and Ts2, when be specified to as the time agitating member speed that will be rotated and agitating member will be rotated during when detection toner surplus speed only need select according to the characteristic that ideal image is operated used imaging device.In addition, in this embodiment, the accumulated time length that developer roll rotates is as the reference that is used to be provided with toner surplus assay intervals length.Yet, with reference to being not necessarily limited to the accumulated time length that developer roll rotates.
In addition, the present invention also is applicable to the electrophotographic image forming apparatus that does not use process cartridge system.Those effects that imaging device obtained among the effect that the present invention is applied to this imaging device and this embodiment are identical.
In addition, the structure of the imaging device among this embodiment makes the agitating member friction of agitation of toner be used to detect the light-transmissive window of toner surplus.Yet application of the present invention is not limited to construct as mentioned above the imaging device that forms.
And in the aforementioned embodiment, the toner surplus in the toner container detects by the safe and harmless toner container of a branch of light of transmission.Yet compatibility of the present invention is not limited to this toner excess detection method.For example, the present invention also can be applicable to following situation: determine the toner surplus by the static capacity that detects the toner main body in the toner container, and, reduce the velocity of rotation of agitating member in order to detect the toner surplus, so that improve the order of accuarcy that detects the toner surplus.
Though with reference to structrual description disclosed herein the present invention, the present invention is not limited to described these details, and this application is intended to cover those can fall into those improvement and change in improvement purpose or the claims scope.
Claims (8)
1. imaging device comprises:
The image-bearing member can form electrostatic latent image thereon;
Developer-accommodating vessel is used to hold the developer of developing electrostatic latent image;
Pick-up unit is used for detecting She's amount of the developer of described developer-accommodating vessel, and wherein said pick-up unit detects She and measures in the process of not carrying out imaging operation;
The developer transfer member is used for carrying and stirring the developer of described developer-accommodating vessel, described developer agitating member can be in the process that detects surplus with than speed rotation low when carry out imaging operation,
Wherein, described pick-up unit detects first, second and the 3rd developer She amount in first, second and the 3rd time period respectively with the order of being named, and, wherein according to first and second Shes measure change second detection time section and the 3rd detection time section between the interval.
2. equipment as claimed in claim 1 is characterized by, when the difference between first surplus developer and the second developer She amount shortens at interval during greater than predetermined value.
3. equipment as claimed in claim 1 is characterized by, when the difference between first surplus developer and the second developer She amount increases at interval during less than predetermined value.
4. equipment as claimed in claim 1 is characterized by, first and second detection time section be continuous.
5. imaging device comprises:
The image-bearing member can form electrostatic latent image thereon;
Developer-accommodating vessel is used to hold the developer of developing electrostatic latent image;
Pick-up unit is used for detecting the surplus of the developer of described developer-accommodating vessel, and wherein said pick-up unit detects surplus in the process of not carrying out imaging operation;
The developer transfer member is used for carrying and stirring the developer of described developer-accommodating vessel, described developer agitating member can be in the process that detects She's amount with than speed rotation low when carry out imaging operation,
Wherein, She who changes described pick-up unit according to image information measure detect with its follow-up surplus detection between the time interval.
6. as each described equipment in the claim 1 to 5, also comprise developer bearing member, be used for bearing developer, wherein developer is fed on the described developer bearing member from described developer-accommodating vessel; Determine at interval according to the accumulation revolution of described developer bearing member, and, wherein change at interval by changing the accumulation revolution.
7. as each described equipment in the claim 1 to 5, it is characterized by, described pick-up unit employing is passed the detection light that is arranged on the transmission mouth in the described developer-accommodating vessel and is detected surplus.
8. as each described equipment in the claim 1 to 5, it is characterized by, described developer agitating member contacts described transmission mouth.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP115989/2005 | 2005-04-13 | ||
| JP2005115989 | 2005-04-13 | ||
| JP092581/2006 | 2006-03-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1847994A true CN1847994A (en) | 2006-10-18 |
| CN100476622C CN100476622C (en) | 2009-04-08 |
Family
ID=37077592
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100667966A Expired - Fee Related CN100476622C (en) | 2005-04-13 | 2006-04-13 | Electrophotographic image forming apparatus |
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| Country | Link |
|---|---|
| CN (1) | CN100476622C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033455A (en) * | 2009-09-28 | 2011-04-27 | 佳能株式会社 | Printing apparatus and control method thereof |
| CN101236389B (en) * | 2007-01-31 | 2011-05-04 | 佳能株式会社 | Developing apparatus, process cartridge and image forming apparatus |
| CN101334610B (en) * | 2007-06-29 | 2012-12-12 | 三星电子株式会社 | Image forming device and control method thereof |
| CN103293911A (en) * | 2012-02-23 | 2013-09-11 | 株式会社理光 | Developing device, image forming apparatus, and processing cartridge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6289182B1 (en) * | 2000-02-18 | 2001-09-11 | Toshiba Tec Kabushiki Kaisha | Method and apparatus for discriminating toner bottle types, stirring toner, and detecting the amount of remaining toner |
-
2006
- 2006-04-13 CN CNB2006100667966A patent/CN100476622C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236389B (en) * | 2007-01-31 | 2011-05-04 | 佳能株式会社 | Developing apparatus, process cartridge and image forming apparatus |
| CN101334610B (en) * | 2007-06-29 | 2012-12-12 | 三星电子株式会社 | Image forming device and control method thereof |
| CN102033455A (en) * | 2009-09-28 | 2011-04-27 | 佳能株式会社 | Printing apparatus and control method thereof |
| US8626005B2 (en) | 2009-09-28 | 2014-01-07 | Canon Kabushiki Kaisha | Printing apparatus, and control method and storage medium therefor |
| CN102033455B (en) * | 2009-09-28 | 2014-01-15 | 佳能株式会社 | Printing apparatus and control method thereof |
| CN103293911A (en) * | 2012-02-23 | 2013-09-11 | 株式会社理光 | Developing device, image forming apparatus, and processing cartridge |
| CN103293911B (en) * | 2012-02-23 | 2016-06-15 | 株式会社理光 | Developing unit, image processing system, and cartridge processing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100476622C (en) | 2009-04-08 |
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