CN1161661C - Multiple colour image forming device - Google Patents
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- CN1161661C CN1161661C CNB981204872A CN98120487A CN1161661C CN 1161661 C CN1161661 C CN 1161661C CN B981204872 A CNB981204872 A CN B981204872A CN 98120487 A CN98120487 A CN 98120487A CN 1161661 C CN1161661 C CN 1161661C
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Abstract
The present invention provides a multicolour image forming device which can eliminate the speed change of a middle copying band for avoiding forming the position deviation of a colour adjusting image. The middle copying band rotates at first speed. In order to copy a multicolour image on the middle copying band on recording paper in a second time, a secondary copying roller is pushed and pressed on the middle copying band only in a secondary copying process. The secondary copying roller is driven by a drive mechanism with a gear device to rotate at peripheral speed larger than the first speed. A torque limiter is used for limiting the drive torque of the secondary copying roller on the middle copying band to the load torque of the secondary copying roller in the process of leaving the middle copying band.
Description
The present invention relates to multicolor image and form device, when particularly obtaining multicolor image, can prevent that the multicolor image of aberration from forming device by overlapping several monochromatic toner images.
Utilize in the image processing system of duplicating machine, facsimile recorder, printer etc. of electrofax mode,, form electrostatic latent image image carrier surface irradiating laser by charged device uniform charged, with developer with this image development, as the toner image imaging.After the print media (hereinafter referred to as recording chart) that this toner image is duplicated paper or plastic sheeting etc. is directly or indirectly gone up again, the output printed images.
Form in the device at multicolor image, be provided with two image-carriers.Be formed on first image-carrier the monotone color image several overlap on second image-carrier (hereinafter referred to as the middle copying body), form the masstone color image after, it is duplicated on recording chart.
This kind multicolor image forms in the device, duplicates on the recording chart for the masstone color image is duplicated the body secondary from the centre, is provided with and middle copying body photocopying roll in opposite directions.This photocopying roll only is urged when secondary duplicates on the middle copying body, and remaining time is left the middle copying body.Therefore, when photocopying roll pressed against on the middle copying body, the middle copying body was impacted, and produced the aberration of image sometimes.
Jap.P. discloses in the electrophotograph apparatus of No. 72912/1993 communique record, by the so-called one-way clutch that only rotates towards a direction transmission, from drive source rotation is passed to photocopying roll, and at this moment, the peripheral speed of photocopying roll is set to such an extent that be lower than the speed of middle copying body.In this device, when photocopying roll and middle copying body join, because the speed of middle copying body is greater than the peripheral speed of photocopying roll, so, above-mentioned throw-out-of clutch, photocopying roll is pushed by the middle copying body, produces the commentaries on classics of so-called company.As a result, the peripheral speed of photocopying roll equates that with the speed of middle copying body the impact that the middle copying body is subjected to when joining is relaxed.
But there is following problem in above-mentioned existing apparatus.That is, photocopying roll is meant that by middle copying body even commentaries on classics the self inertia acceleration torque and the friction torque of photocopying roll act on the middle copying body.Therefore, in the time of when photocopying roll and middle copying body join and beyond joining, the load difference of middle copying body.In other words, when the recording chart secondary duplicates and secondary duplicate beyond the time, load change.The duplicating of monotone color image from first image-carrier to the middle copying body promptly once duplicated, and secondary duplicates whether underway all execution.Therefore, the monotone color image that in secondary duplicates, once duplicates, duplicate with secondary beyond the time monotone color image that once duplicates, as the duplicating position stagger, the result produces aberration in multicolor image.In addition, be used to make the cleaning balde of photocopying roll cleaning surfaces to be urged at this photocopying roll, so the load that the frictional resistance of this cleaning balde produces also becomes the load of middle copying body indirectly, with the problems referred to above similarly, make multicolor image produce aberration.
In addition, in order to remove the toner (used toner) that remains on the middle copying body, being provided with cleaning device is clearer, even this clearer is urged on the middle copying body, also produces the load change of middle copying body.For this reason, in order to reduce the frictional resistance of clearer and middle copying body, consider clearer is made brush and sac like, but can cause complex structureization like this, cost rises.The present invention makes in view of the above problems, and its purpose is to provide a kind of load change that can lower the middle copying body, prevents that the multicolor image of multicolor image aberration from forming device.
To achieve these goals, multicolor image of the present invention forms device, and the monotone color image that once duplicates is overlapped on the middle copying body, forms the masstone color image, and this masstone color image secondary is duplicated on the print media, obtains required multicolor image; It has first driving mechanism, secondary photocopying roll, second driving mechanism and torque limit mechanism; Above-mentioned first driving mechanism makes above-mentioned middle copying body move with first speed that forms image; Above-mentioned secondary photocopying roll is for above-mentioned masstone color image secondary is duplicated on the above-mentioned print media, to press against when secondary duplicates on the above-mentioned middle copying body; Above-mentioned second driving mechanism makes above-mentioned secondary photocopying roll with the peripheral speed rotation greater than above-mentioned first speed; Above-mentioned torque limit mechanism is, the driving torque of above-mentioned secondary photocopying roll when being urged above-mentioned secondary photocopying roll on the middle copying body, that produced by second driving mechanism is restricted to the load torque of the secondary photocopying roll when leaving above-mentioned middle copying body.
According to this feature, be urged the secondary photocopying roll on the middle copying body, by second drive mechanism, with peripheral speed rotation greater than the middle copying body.The load of this both speed official post secondary photocopying roll increases, and the increase of this load torque is worked torque limit mechanism.As a result, the peripheral speed of secondary photocopying roll is near the speed of middle copying body, and the load of secondary photocopying roll reduces, the restriction cancellation of driving torque, and the secondary photocopying roll is again with the speed rotation greater than the middle copying body.Like this, the secondary photocopying roll be controlled as with the middle copying body with speed or bigger slightly speed.
Fig. 1 is the stereographic map of the middle copying device that image processing system comprised of the present invention the 1st embodiment.
Fig. 2 is the drive system figure of secondary photocopying roll.
Fig. 3 be among the 1st embodiment the middle copying device want portion's outboard profile.
Fig. 4 is the stereographic map of secondary photocopying roll dipper crowding gear.
Fig. 5 is the sectional view of image processing system.
Fig. 6 is the stereographic map of the middle copying device that image processing system comprised of the present invention the 2nd embodiment.
Fig. 7 be among the 2nd embodiment the middle copying device want portion's outboard profile.
Fig. 8 be among the 3rd embodiment the middle copying device want portion's outboard profile.
Fig. 9 is the figure of the driving torque upset condition of expression middle copying body.
Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.Fig. 5 is the summary sectional view that color image forms device more than one embodiment of the invention.Among Fig. 5, around tubular photoreceptor 1, disposing the well-known components (all not shown) that charged device, laser scanner, developer and clearer etc. are used to form the electrofax image.Photoreceptor 1 is by charged device uniform charged, and the laser of modulating according to view data is shone by laser scanner, thereby forms electrostatic latent image on this photoreceptor 1.The electrostatic latent image that forms in developer with the toner development of predetermined color.
The recording chart of extracting out from sheet feed stacker 11, by disposing a pair of Elastic supporting roller (レ ジ ロ-Le) 12, a pair of Elastic supporting roller in advance (プ レ レ ジ ロ-Le) 13 and a pair of transport roller 14 transport road (among the figure shown in the dotted line), deliver to secondary and duplicate the position.Duplicate the position at secondary, the toner image on the copying band 7 is duplicated on the recording chart by the effect of secondary photocopying roll 9.Be copied toner image on the recording chart by the 15 heating fixation of a pair of fixation roller after, being discharged to discharge dish 16 is the top of image processing system 17 or discharge dish 18.Discharge dish 16 is the image of recording chart to be duplicated the what is called of discharging that faces down face lower wall, and discharge dish 18 is that image is duplicated the what is called of discharging of the facing up dish that faces up.Recording chart after printing finishes is transported to discharge dish 16 by pair of rolls 19,20 and 21.On the other hand, the recording chart after printing finishes is transported to discharge dish 18 by pair of rolls 19 and 22.Dirty in pair of rolls 19 is provided with and is used to switch the gate (figure does not show) that transports the road, utilizes the switching of this gate, and decision is to select to face lower wall or face up dish.
In the above-mentioned image processing system, the toner image that forms with the order of Y, M, C, K look on photoreceptor 1 in photocopying roll 3 and photoreceptor 1 once duplicating position in opposite directions, is copied on the copying band 7.On copying band 7, according to picture size, there is one or several sheets toner image in the same time.For example, during little image, on per two pages, form toner image respectively simultaneously.At this moment, for example for the image of anticipatory paging, the overlapping of the toner image that the YMCK on copying band 7 is whole finished, even begin secondary when duplicating to recording chart, but at this constantly, also for the once duplicating of one page down and not finish.That is, for following one page, only the once duplicating of YMC toner image finishes, as the K tone color image of last tone color image, in also once duplicating.In addition, after the secondary of anticipatory paging duplicated and finishes, in the secondary duplicating process of following one page, to descending one page again, beginning initial toner image was the once duplicating of Y tone color image.Like this, the toner image of Y, K look is once duplicated in secondary duplicating process, and the toner image of C, M look is once duplicated when non-secondary duplicates.
In the process that secondary duplicates, secondary photocopying roll 9 is urged on copying band 7, when secondary duplicates beyond, secondary photocopying roll 9 leaves copying band 7, so secondary duplicating process neutralizes the time beyond it, acts on load change on the copying band 7.As a result, the Y that in secondary duplicating process, is once duplicated, the toner image of K look and the C that when non-secondary duplicates, is once duplicated, the toner image of M look, staggering in the formation position of the two, produces aberration, can not present required color.
In the present embodiment, eliminate the dislocation of this toner image by adopting following structure.Fig. 2 is the drive system figure of secondary photocopying roll 9 that is used to eliminate the dislocation of toner image of all kinds.Among this figure, the rotation of motor 40 is slowed down by toothed gearing 24, and the rotation that is decelerated passes to secondary photocopying roll 9 by the torque limiter 28 as torque limit mechanism.Here, the setting value TL of the transmitting torque of torque limiter 28 greater than the load torque T2 of secondary photocopying roll 9 (TL＞T2), and, preferably reduce (TL-T2) as far as possible.In addition, the diameter of motor 40, toothed gearing 24 and secondary photocopying roll 9 is set like this, that is, make the peripheral speed Vr of secondary photocopying roll 9 be not less than the velocity of rotation Vb of copying band 7 slightly greatly or at least than the velocity of rotation Vb of copying band 7.Effect about these torques and speed setting will be narrated in the back.
Below, describe the structure and the action of middle copying device 8 in detail.Fig. 1 is the stereographic map of expression middle copying device 8.Among this figure,, fixing gear 23, this gear 23 is being passed in rotation from the drive source that do not show of figure in the end of the axle 2a of driven roller 2.The copying band 7 that is erected on the driven roller 2 is rotated towards the arrow A direction.
In the end of copying band 7, disposing the sensor 34 that detects these copying band 7 positions.This sensor for example be will oneself output rayed on copying band 7, detect and to have or not catoptrical optical sensor, the on/off variation that is subjected to light signal that is formed on 35 positions, hole on the copying band 7 is exported as the position detection signal of copying band 7.The control part that is made of microcomputer (figure does not show) is judged the toner image position on the copying band 7 according to above-mentioned position detection signal, obtains toner image is duplicated time on the recording chart.Before YMCK masstone color image was formed on the copying band 7, secondary photocopying roll 9 left copying band 7, and when this masstone color image was duplicated on recording chart, secondary photocopying roll 9 was urged on copying band 7.
As the load torque T2 of secondary photocopying roll 9 during greater than the torque settings value TL of torque limiter 28, this torque limiter 28 is cut off, and secondary photocopying roll 9 is not passed in the rotation of the motor that transmits by gear 25.When load torque T2 when setting value TL is following, this torque limiter 28 is connected, and make 9 rotations of secondary photocopying roll, but as mentioned above, the peripheral speed of secondary photocopying roll 9 at this moment is set at the velocity of rotation that is not less than copying band 7 at least.
Below, the relation of the torque of copying band 7 and secondary photocopying roll 9 is described by above-mentioned speed setting and torque settings.Fig. 3 be middle copying device 8 want portion's outboard profile, Fig. 4 is the stereographic map of secondary photocopying roll dipper crowding gear.The axle 9a of secondary photocopying roll 9, being bearing in be an end of the arm 37 that freely swings of center with axle 36, the while, secondary photocopying roll 9 was pressed on the copying band 7 by trying hard to recommend of this spring 38 by spring 38 clockwise direction effect in figure.The turning axle 36 of arm 37 be with said gear 30,31 the axle be all an axle, perhaps be configured at least coaxial on.Like this, with the pushing of secondary photocopying roll 9, leave irrelevant, and the engagement that keeps gear 31 and gear 32 always.
At the other end of arm 37, disposing offset cam 39 in opposite directions, this arm 37 is pressed against on the cam surface of offset cam 39 by spring 38, so arm 37 is swung along with the rotation of offset cam 39.Therefore, when the radius of this offset cam 39 was positioned at maximum position, arm 37 was counterclockwise swung in figure, and secondary photocopying roll 9 leaves copying band 7.
Among Fig. 3, when copying band 7 was driven, torque T1 acted on this copying band 7, and load torque T2 acts on the secondary photocopying roll 9.Load torque T2 mainly is the pushing generation by cleaning balde 33.Like this, when secondary duplicated, on the torque T1 when load torque T2 acts on copying band 7 drivings, in the time of beyond secondary duplicates, load torque T2 did not act on the copying band 7, so, according to different torque in period T1 changes.
Fig. 9 is expression with the pushing of cleaning balde 33, leaves and the variable condition of the above-mentioned torque T1 that produces.As shown in the drawing, when cleaning balde 33 is being urged (between t1 and t2) and be urged beyond the time, the value of torque T1 only differs Δ T1.
In the present embodiment, in order to reduce the variation Δ T1 of above-mentioned torque T1, drive secondary photocopying rolls 9, and make its peripheral speed Vr greater than the velocity of rotation Vb of copying band 7 or be not less than Vb at least with the motor 40 of the drive source that is different from copying band 7.Like this, the load torque T2 that pushing secondary photocopying roll 9 is produced can reduce, and by this load torque, the suffered change of T1 reduces.In addition, it is desirable that the peripheral speed Vr that makes secondary photocopying roll 9 is consistent with the velocity of rotation Vb of copying band 7 always, but in fact is not easy to accomplish.Therefore, in the present embodiment, make the peripheral speed of secondary photocopying roll 9 be a bit larger tham the velocity of rotation Vb of copying band 7.
Below, specifically describe the reason that above-mentioned cogging Δ T1 reduces.The velocity contrast of secondary photocopying roll 9 and copying band 7 makes copying band 7 become the load of secondary photocopying roll 9, and the load torque T2 of secondary photocopying roll 9 increases.When load torque T2 had surpassed the torque settings value TL of torque limiter 28, the combination of torque limiter 28 was cut off, and secondary photocopying roll 9 is not driven, and load torque T2 reduces.So, torque limiter 28 combination once more, secondary photocopying roll 9 is driven.By repeatedly such, the load torque T2 that acts on the copying band 7 is restricted to minimum.As a result, load torque T2 act on secondary on the copying band 7 when duplicating and load torque T2 do not act on non-secondary on the copying band 7 when duplicating, the change of torque T1 reduces.
Below, the 2nd embodiment of the present invention is described.Make the main cause of copying band 7 speed fluctuations, except by the pushing of secondary photocopying roll 9, leave generation, also by cleaning balde to the pushing of copying band 7, leave and produce.The 2nd embodiment, can prevent because of cleaning balde to the pushing of copying band 7, leave the speed fluctuation of the copying band 7 that produces.
Fig. 6 is the stereographic map that duplicates body 8 between among the 2nd embodiment, with label identical among Fig. 5, represents same or equal part.Among this figure, driven voller 4A is not idle running (free time) roller, and is driven by motor 41.Motor 41 can be same motor with the motor that drives driven roller 2, also can be special-purpose motor.The rotation of motor 41 by clutch coupling 42 and the gear 43 as torque limit mechanism, passes to the gear 44 on the axle that is fixed on driven voller 4A.Clutch coupling 42 can adopt one-way clutch or electromagnetic clutch.
Cleaning balde 46 disposes with driven voller 4A in opposite directions by copying band 7, and pushing, separating mechanism by figure does not show push or separation with respect to copying band 7.For example, duplicate the toner image secondary that is once duplicated with the order of YMCK look on the recording chart after, cleaning balde 46 is pressed against on the copying band 7, scrape toner not.As pushing, the separating mechanism of cleaning balde 46, can adopt as Fig. 3, cam illustrated in fig. 4 and the combiner of spring, perhaps also can adopt the combiner of solenoid and spring etc.This pushing, separating mechanism are not the main points of present embodiment, so figure does not show.
The used toner on copying band 7 surfaces under the scraper plate 46 that is cleaned scrapes, fall that figure do not show connect in the dish after, be recovered in the collection box 47 (Fig. 7) with conveyers such as screw rods.Collection box 47 can and connect the dish disposed adjacent with cleaning balde 46, also can configured separate.Jap.P. discloses in the retracting device that No. 318886/1992 communique disclose, and used toner is transported to and connects in the collection box that dish separates.
Below, with reference to the torque of Fig. 7 illustration on the copying band 7 of middle copying device 8.Among Fig. 7, copying band 7 is driven by torque T1, and when pressing against cleaning balde 46 on this copying band 7, effect has resistibility TN.Because having or not of this resistibility TN makes copying band 7 produce speed fluctuation, so, among the 2nd embodiment, drive driven voller 4A forcibly with motor 41, reduce resistibility TN.At this moment, the peripheral speed of driven voller 4A is set at the peripheral speed that equals or be not less than driven roller 2 at least.
For example, in the action clutch coupling 42 during as one-way clutch, when cleaning balde 46 was urged on copying band 7, the load of driven voller 4A increased.So the speed of driven voller 4A reduces, clutch coupling 42 combinations, driven voller 4A is forced to drive by motor 41, and the resistibility TN that acts on the copying band 7 alleviates.On the other hand, when cleaning balde 46 leaves copying band 7, act on the last load of driven voller 4A and alleviate.So the speed of driven voller 4A increases, the combination of clutch coupling 42 is removed.At this moment, driven voller 4A rotates along with the rotation of copying band 7.Like this, the pushing of the peripheral speed of driven voller 4A and cleaning balde 46 is whether irrelevant, is controlled as the speed of being a bit larger tham copying band 7 or equal speed.
Therefore, when cleaning balde 46 is urged on copying band 7 and when leaving copying band 7, can reduce load change to copying band 7.Clutch coupling 42 is not limited to be located at position shown in Figure 6, if be located at can be with respect to acting on load on the driven voller 4A and break-make from the position of the driving force of 41 couples of driven voller 4A of motor.For example, can be with the bearing itself of gear 43 or 44 as one-way clutch.
In addition, when adopting electromagnetic clutch, be provided with control device as clutch coupling 42, this control device make cleaning balde 46 pushings, separate during, for example reply solenoid or action of cam signal, to the electromagnetic clutch energising or stop energising.In addition, the driving force of driven voller 4A is the auxiliary force of the driving force of driven roller 2, can not drive copying band 7 with the driving force greater than driven roller 2 leadingly.For this reason, preferably make the coefficientoffriction 2 of the coefficientoffriction 1 of driven roller 2 greater than driven voller 4A.For example, do driven roller 2 with the big urethane resin of friction factor, also the accurately machined aluminium of usable surface is driven voller 4A.In addition, promptly use identical material, also the surface of driven roller 2 will be done, make their friction factor difference than the rough surface of driven voller 4A.
Below, the 3rd embodiment of the present invention is described.Among Fig. 8, the copying band 7 of middle copying body 8, same with the 1st embodiment, be that 4,5,6 and photocopying rolls 3 of driven voller set up by driven roller 2, idle roller.4,5 of driven vollers, driven voller 48 joins with copying band 7, and this driven voller 48 is driven power and forces rotation, is used for the restriction load.Cleaning balde 46 presses against on this driven voller 48 by copying band 7.This cleaning balde 46 and the 2nd embodiment are same, and for example in the process of last K look being duplicated temporarily on copying band 7, for the toner that scrapes on the copying band 7 is urged, all the other times are left copying band.
No matter whether cleaning balde 46 is urged, and driven voller 48 is all often driven by motor 50 by gear 45,49.Motor 50 can be with the motor that drives driven roller 2 be same motor, also special-purpose motor, this point and the 2nd embodiment are same.The peripheral speed of driven voller 48 is identical or slightly larger with the speed of the copying band 7 that is driven by driven roller 2.That is, the peripheral speed of driven voller 48 is only to be equivalent to the part that load that the pushing because of cleaning balde produces reduces the speed of the copying band 7 of increase, as the predetermined value bigger than the setting speed of copying band 7.In addition, this driven voller 48 is the auxiliary of driven roller 2, and this point is identical with embodiment 2.So the coefficientoffriction 3 that copying band 7 and driven voller are 48 is less than the coefficientoffriction 1 of 2 of copying band 7 and driven rollers.
In this structure, and be erected at the driven voller 48 that the part of the copying band 7 of 4,5 of two driven vollers is joined, when cleaning balde 46 does not push, for copying band 7 zero load changes.When cleaning balde 46 was urged, the load of this cleaning balde 46 affacted on the copying band 7.But at this moment, because the pushing force effect of cleaning balde 46, the driving force of driven voller 48 acts on the copying band 7, and the load of above-mentioned cleaning balde 46 is cancelled.
Among above-mentioned the 2nd embodiment, copying band 7 is big with the contact angle (angle) of driven voller 4A, and the pushing force of cleaning balde 46 becomes big resistibility for copying band 7, so, make the rotation of driven voller 4A interrupted, lower load to copying band 7.And among the 3rd embodiment, because driven voller 48 only is that line contacts with copying band 7, so, become the pushing force of the cleaning balde 46 of the resistibility of copying band 7 minimum.Therefore, among the 3rd embodiment,, then between motor 50 and the driven voller 48 torque limit mechanism is not set, can alleviates the load of 46 pairs of copying band 47 of cleaning balde as long as make the peripheral speed of driven voller 48 be a bit larger tham the velocity of rotation of copying band 7.
As mentioned above, among the present invention, no matter whether the secondary photocopying roll presses against on the middle copying body, and the secondary photocopying roll all is controlled in identical speed with the middle copying body or the rotation of big slightly speed.Therefore, the load that acts on the secondary photocopying roll on the middle copying body does not increase, so the velocity of rotation of middle copying body does not change, and the duplicating position deviation between each the monotone color image in the time of can reducing once to duplicate.As a result, can obtain the high-quality multicolor image of no color differnece.
Claims (9)
1. a multicolor image forms device (17), and the monotone color image that once duplicates is overlapped on the middle copying body, forms the masstone color image, and this masstone color image secondary is duplicated on the print media, obtains required multicolor image; It is characterized in that, have first driving mechanism, secondary photocopying roll (9), second driving mechanism and torque limit mechanism;
Described first driving mechanism makes described middle copying body move with first speed that forms image;
Described secondary photocopying roll (9) duplicates described masstone color image secondary on the described print media, presses against when secondary duplicates on the described middle copying body;
Described second driving mechanism makes described secondary photocopying roll (9) with the peripheral speed rotation greater than described first speed;
Described torque limit mechanism, the driving torque of described secondary photocopying roll (9) when being urged described secondary photocopying roll (9) on the middle copying body, that produced by second driving mechanism is restricted to the load torque of the secondary photocopying roll (9) when leaving described middle copying body.
2. multicolor image as claimed in claim 1 forms device (17), it is characterized in that, above-mentioned torque limit mechanism is torque limiter (28), it constitutes, the load torque scheduled volume of the above-mentioned secondary photocopying roll (9) that whether load torque of the above-mentioned secondary photocopying roll (9) when duplicating according to secondary has surpassed non-secondary when duplicating, and determine the combination or the disconnection of second driving mechanism and above-mentioned secondary photocopying roll (9).
3. multicolor image as claimed in claim 1 or 2 forms device (17), it is characterized in that, in order to clean the surface of above-mentioned secondary photocopying roll (9), also has the cleaning mechanism that joins with this secondary photocopying roll (9).
4. a multicolor image forms device (17), and the monotone color image that once duplicates is overlapped on the middle copying band (7), forms the masstone color image, and this masstone color image secondary is duplicated on the print media, obtains required multicolor image; It is characterized in that, have driven roller (2) and several driven vollers (4A, 5,6), first driving mechanism, cleaning mechanism, second driving mechanism and clutch;
Described driven roller (2) and several driven vollers (4A, 5,6) set up described middle copying band (7);
Described first driving mechanism makes described middle copying band (7) move with first speed that forms image;
Described cleaning mechanism is used to clean the surface of described middle copying band (7), presses against on the driven voller (4A) in the described driven voller (4A, 5,6) by this middle copying band (7);
Described second driving mechanism makes a described driven voller (4A) with the peripheral speed rotation greater than described first speed;
Described clutch, be included in described second driving mechanism, when described cleaning mechanism is pushed to that a described driven voller (4A) is gone up and load when increasing, transmission of power is arrived on the described driven voller (4A), when described cleaning mechanism leaves a described driven voller (4A) and load when reducing, cut off transmission of power to a described driven voller.
5. multicolor image as claimed in claim 4 forms device (17), it is characterized in that, the peripheral speed of above-mentioned driven voller (4A) is the predetermined value greater than above-mentioned first speed, and this value just is equivalent to the part that the speed of the above-mentioned middle copying band (7) of increase reduced because of the pushing of above-mentioned cleaning mechanism load.
6. form device (17) as claim 4 or 5 described multicolor images, it is characterized in that, above-mentioned clutch is the one-way clutch that only rotates towards a direction transmission.
7. form device (17) as claim 4 or 5 described multicolor images, it is characterized in that above-mentioned clutch is an electromagnetic clutch, reply the signal that makes the cleaning mechanism pushing, leaves, carry out energising and stop energising.
8. form device (17) as each described multicolor image in the claim 4 to 7, it is characterized in that the surface roughness of an above-mentioned driven roller (2) and an above-mentioned driven voller (4A) is set like this: make friction factor between an above-mentioned driven voller (4A) and middle copying band (7) less than the friction factor between above-mentioned driven roller (2) and middle copying band (7).
9. a multicolor image forms device (17), and the monotone color image that once duplicates is overlapped on the middle copying band (7), forms the masstone color image, and this masstone color image secondary is duplicated on the print media, obtains required multicolor image; It is characterized in that, have driven roller (2) and several driven vollers (4,5,6), first driving mechanism, load limit driven voller (48), cleaning mechanism and second driving mechanism;
Described driven roller (2) and several driven vollers (4,5,6) are setting up described middle copying band (7);
Described first driving mechanism makes described middle copying band (7) move with first speed that forms image;
Described load limit driven voller (48) is positioned at and is configured in secondary and duplicates the driven voller (5) of position and be configured between thereafter the driven voller (4), joins with the middle copying band (7) that tensioning frame is located between these two driven vollers (4,5);
Described cleaning mechanism is used to clean the surface of described middle copying band (7), presses against on the described load limit driven voller (48) by this middle copying band (7);
Described second driving mechanism, make described load limit driven voller (48) with greater than the rotation of the predetermined circle speed of first speed, this predetermined circle speed just is equivalent to the part that the pushing load because of described cleaning mechanism reduces the translational speed of the described middle copying band (7) of increase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981204872A CN1161661C (en) | 1998-10-26 | 1998-10-26 | Multiple colour image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981204872A CN1161661C (en) | 1998-10-26 | 1998-10-26 | Multiple colour image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1252539A CN1252539A (en) | 2000-05-10 |
| CN1161661C true CN1161661C (en) | 2004-08-11 |
Family
ID=5226766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981204872A Expired - Fee Related CN1161661C (en) | 1998-10-26 | 1998-10-26 | Multiple colour image forming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1161661C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8059999B2 (en) | 2007-07-25 | 2011-11-15 | Kyocera Mita Corporation | Belt conveyor and image forming apparatus |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7113733B2 (en) | 2002-12-06 | 2006-09-26 | Seiko Epson Corporation | Image forming apparatus with moveable cleaning or transfer member |
| JP4506345B2 (en) * | 2004-08-11 | 2010-07-21 | 富士ゼロックス株式会社 | Printing control apparatus, method and program |
-
1998
- 1998-10-26 CN CNB981204872A patent/CN1161661C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8059999B2 (en) | 2007-07-25 | 2011-11-15 | Kyocera Mita Corporation | Belt conveyor and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1252539A (en) | 2000-05-10 |
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