CN100440073C - Belt driving unit, method of switching control loop for the belt driving unit, and image forming apparatus - Google Patents
Belt driving unit, method of switching control loop for the belt driving unit, and image forming apparatus Download PDFInfo
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- CN100440073C CN100440073C CNB2005100875663A CN200510087566A CN100440073C CN 100440073 C CN100440073 C CN 100440073C CN B2005100875663 A CNB2005100875663 A CN B2005100875663A CN 200510087566 A CN200510087566 A CN 200510087566A CN 100440073 C CN100440073 C CN 100440073C
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Abstract
A band type driving device is capable of controlling a band at a correct position even if the scale on the band worsens due to time-efficiency pollution or damage, thereby not producing uneven topping on a composite colorful image with more than two colors. A normal position control ring circuit (R1) is provided to correct and control the band position of an intermediate transfer printing band (10) based on the scale (5) information formed on the intermediate transfer printing band (10) and read by a sensor (6). In addition, an abnormality control ring circuit (R2) which is used in case of the abnormality of the standard position control ring circuit (R1) is provided to correct and control the band position based on the signal of an attached frequency generator (8) of a band type driving motor (7). The time switching from the normal position control ring circuit (R1) to the abnormality control ring circuit (R2) is the time not including an image forming process. Thus, as the control ring circuits are not switched during the image forming process, no position alteration with the switchover of the control ring circuits is produced on the intermediate transfer printing band (10), thereby preventing the uneven topping of the toner image.
Description
Technical field
The present invention relates to the belt-type drive device and have the image processing system of this drive unit and the control loop changing method of belt-type drive device, this belt-type drive device has: the normal place control loop, its by sensor read be formed at on scale, detect band actual band position or belt speed, the driving of proofreading and correct the control band according to this testing result from this information that reads; Control loop when unusual, it produces usefulness when unusual on this normal place control loop.
Background technology
In recent years, along with the requirement in market, image processing systems such as increasing duplicating machine and printer can form coloured image.In the image processing system that can form this full-color image, for example dispose a plurality of photoreceptors side by side, the developing apparatus that the toner that should each photoreceptor be provided with respectively by different colours is developed simultaneously, on each photoreceptor, form monochromatic toner image respectively, by with this monotone toner image sequence transfer printing on the intermediate transfer body of band shape or roller shape, form the so-called tandem device of colored synthetic full-color image.
This tandem type image forms device and has following transfer printing mode, promptly as shown in figure 17, to distinguish each photoreceptor 91Y on the dead in line by each transfer device 92,91M, toner image order transfer printing on the 91K is being equipped on along on the sheet material conveying belt 93 of arrow A direction rotation and on the sheet material P that is transferred, on this sheet material P, form the direct transfer printing mode of coloured image, as shown in figure 18, with a plurality of each photoreceptor 91Y, 91M, 91C, toner image on 91K transfer printing overlappingly successively utilizes secondary transfer printing device 95 with the indirect transfer printing mode of the image on this intermediate transfer belt 94 transfer printing in the lump on sheet material P along on the intermediate transfer belt 94 of arrow B direction rotation.
Form in the device at this in-line coloured image, in the device of for example use intermediate transfer belt shown in Figure 180, owing to make the toner image that is formed at the different colours on each photoreceptor overlapping on intermediate transfer belt, form coloured image, so when the mutual dislocation of the position of this doubling of the image of all kinds, then changing on chromatography and delicate tone on the image, image quality reduces.Therefore, the offset of this toner image of all kinds (chromatography inequality) constitutes important problem.
Therefore, as the device that drives existing transfer belt, have and for example be recorded in this device in the patent documentation 1～3.
Patent documentation 1: the spy opens flat 10-232566 communique
Patent documentation 2: the spy opens the 2002-91264 communique
Patent documentation 3: the spy opens flat 11-24507 communique
The image processing system of record in the patent documentation 1, utilization detects the slit of being located on the whole week as the sensor unit of first pick-up unit on the transfer belt of being rotated by the band driven roller, and utilize of the rotating speed encode of second scrambler to the band driven roller of rotatable supporting transfer belt, the rotating speed of the band driven roller that will obtain by this second scrambler with detect by sensor unit and compare by the belt speed of the first scrambler encode, calculate the slippage of transfer belt, proofread and correct the rotating speed of control band driven roller, the phase differential that makes these two scramblers is 0.
Following record is arranged in patent documentation 2, utilize sensor to read and do not contain, according to this information feedback that reads control intermediate transfer belt along the part that circumferentially is arranged at the cutting of the scale on the intermediate transfer belt.
Record following color copy machine in the patent documentation 3, hang up intermediate transfer belt (transfer belt) rotationally containing between five backing rolls of a driven roller, by at the outer peripheral face of this intermediate transfer belt with dark green, pinkish red, yellow, black four colour toners images with the overlapping state transfer printing of order, form coloured image.
Intermediate transfer belt inner face at this color copy machine is provided with the scale that is formed by fine and accurate scale, utilize fluorescence detector (sensor) to read this scale, correctly detect the shift position of intermediate transfer belt, utilize this detected shift position of feedback control system FEEDBACK CONTROL, the control intermediate transfer belt makes it become correct shift position.
But, in the record of patent documentation 1, detect the slit and with first scrambler of the signal codeization of sensor unit output because pollute, when scratch and timeliness deterioration etc. and the function that can not bring into normal play, owing to there is not the control means for correcting with its replacement, existence can not be proofreaied and correct the problem points of the position (speed) of control transfer belt.
In addition, also there are the following problems in the record of patent documentation 2, scale and detect the sensor of scale because pollute, damage and timeliness deterioration etc. detect when bad, because not with the control loop of its replacement, so can not proofread and correct the position of controlling intermediate transfer belt.
Also there are the following problems in the record of patent documentation 3, in scale wearing and tearing, damage and adhering toner etc. and when polluting thereon, surveys because sensor produces flase drop when reading the scale of this scale, so can not be with position control normally.
Summary of the invention
The present invention puts in view of the above problems and produces, its purpose is, even with on scale wearing and tearing or scratch and adhering toner etc. and pollution deterioration thereon, also drive controlling band correctly, simultaneously, even the combined color image that the formation dichromatism is above can not produce the chromatography inequality yet on this image.
The present invention provides a kind of belt-type drive device for achieving the above object, and it comprises: the endless belt that is formed with the rotation of the scale that is made of a plurality of scales; Read the sensor of said scale; The said scale information that reads from this sensor detects the band position of the reality of band, according to the normal place control loop of the band position of the band position correction control band of this reality; Control loop when this normal place control loop produces use when unusual unusual is characterized in that, is provided with above-mentioned normal place control loop of control and above-mentioned loop control device switching time of the switching time of the control loop between control loop when unusual.
In addition, the invention provides a kind of belt-type drive device, it comprises: the endless belt that is formed with the rotation of the scale that is made of a plurality of scales; Read the sensor of said scale; From the said scale information that this sensor reads, detect the belt speed of the reality of band, proofread and correct control and make this actual belt speed become the normal place control loop of constant speed; Control loop when this normal place control loop produces use when unusual unusual is characterized in that, is provided with above-mentioned normal place control loop of control and above-mentioned loop control device switching time of the switching time of the control loop between control loop when unusual.
Above-mentioned when unusual control loop also can be based on the loop of driving of signal correction control band of frequency generator of the motor of rotation rotating band.
Control loop also can be based on from the signal of scrambler of the motor shaft of the motor that is installed on the rotation rotating band and proofread and correct the loop of the driving of control band when in addition, this was unusual.
Control loop can be based on also that slit that the roller periphery of the described band of rotatably support along the circumferential direction forms is configured in that near it sensor detects and the signal exported is proofreaied and correct the loop of the driving of control band when this was unusual.
In addition, the present invention also provides a kind of image processing system, and it has above-mentioned belt-type drive device, the time except that image forms in the operation of switching to of above-mentioned control loop.
The invention provides a kind of image processing system, has above-mentioned belt-type drive device, above-mentioned loop control device switching time, produce when unusual at above-mentioned standard control loop, switch to above-mentioned control loop when unusual, then, when producing this unusual normal place control loop and recover normal condition, in time form in the operation except that image, carry out from above-mentioned when unusual control loop switch to the control of above-mentioned normal place control loop.
Even the time of above-mentioned loop control device switching time during image forms when monochrome image forms, also can carry out the switching of above-mentioned control loop.
The present invention also provides a kind of control loop changing method, it is described each the loop changing method of belt-type drive device, produce when unusual at above-mentioned normal place control loop, switch to above-mentioned control loop when unusual, then, when producing this unusual normal place control loop and recover normal condition, in the time in removing image formation operation, from above-mentioned when unusual control loop switch to above-mentioned normal place control loop.
According to the present invention, when scale wearing and tearing on tape or damage and adhering toner etc. and pollution deterioration, the control loop of use switches to control loop when unusual, the driving of proofreading and correct the control band from the normal place control loop, therefore, band constitutes correct band position or belt speed.
And, because the time that may command is switched this control loop, so form the switching that can not cause control loop in the operation at image.Thus, even form the above coloured image of dichromatism, it is unequal also can not produce chromatography.
In addition, the situation that the time of loop control device switching time during even image forms when monochrome image forms also can be carried out the switching of control loop, even for example in image forms, also can be under the situation beyond coloured image forms, promptly, when monochrome image forms, carry out the switching of control system loop immediately, therefore, can earlier switch to the control when corresponding unusual.
Description of drawings
Fig. 1 is a summary construction diagram of representing one of belt-type drive device of the present invention example with control system;
Fig. 2 is that the image processing system that expression has this identical belt-type drive device is the one-piece construction figure of one of color copy machine example;
Fig. 3 is illustrated in complete cycle to be provided with the planimetric map of band position probing with the part of the intermediate transfer belt of scale;
Fig. 4 is the skeleton diagram that the sensor output of the sensor of being located at the scale on the intermediate transfer belt and the output of this sensor is read in expression;
Fig. 5 is the block diagram of position control system of intermediate transfer belt of the color copy machine of presentation graphs 2;
Fig. 6 is used to illustrate on the motor shaft of belt-type drive motor examples of encoder to be installed and at the stereographic map of the example in a distolateral formation slit of the driven roller of rotatably support intermediate transfer belt;
Fig. 7 is that expression will be from the signal feedback of this identical scrambler block diagram to the example of motor control part;
Fig. 8 be expression will detect the distolateral slit of the driven roller one that is formed at Fig. 6 from the signal feedback of sensor block diagram to the example of motor control part;
Fig. 9 is the block diagram that is used for two feedback control loops that the color copy machine of key diagram 2 has;
Figure 10 is the figure of the sensor output when being used to illustrate the state that produces damage on the scale of scale;
Figure 11 is the figure of the sensor output when being used to illustrate the state of the pollution that produces toner on the scale of identical scale;
The process flow diagram of the program of the normal place control and treatment of the intermediate transfer belt that the microcomputer of Figure 12 control device that to be expression have about the belt-type drive device of Fig. 1 carries out;
Figure 13 is the figure of the deterioration state that is used to illustrate that scale is unusual;
The process flow diagram of the program of control and treatment during the intermediate transfer belt that the microcomputer of Figure 14 control device that to be expression have about the belt-type drive device of Fig. 1 carries out unusual;
Figure 15 is the summary construction diagram identical with Fig. 1 of the embodiment of the expression belt-type drive device that is provided with two sensors that read the scale that is formed at intermediate transfer belt;
Figure 16 is the oscillogram of the output waveform of these identical two sensors of expression;
Figure 17 is the structural drawing of the only presentation video formation portion of one of image processing system of existing direct transfer printing mode example;
Figure 18 is the structural drawing of the only presentation video formation portion of one of image processing system of existing indirect transfer printing mode example.
Symbol description
5 scales
The 5a scale
6,6A, 6B, 41 sensors
7 belt-type drive motor
The 7a motor shaft
8 frequency generators
10 intermediate transfer belts (endless belt)
20 belt-type drive devices
38 scramblers
39 slits
70 control device (loop control device switching time)
R1 normal place control loop
Control loop when R2 is unusual
Embodiment
Below, be used to implement optimum way of the present invention with reference to description of drawings.
Fig. 1 is a summary construction diagram of representing one of belt-type drive device of the present invention example with control system, and Fig. 2 is that the image processing system that expression has this identical belt-type drive device is the one-piece construction figure of one of color copy machine example.
As shown in Figure 1, the belt-type drive device 20 of this embodiment comprises: intermediate transfer belt 10, and it is to make the scale 5 that is made of a plurality of scales spread all over the endless belt along the arrow C rotation that complete cycle (only diagram is a part of among Fig. 1) forms; Sensor 6, it reads scale 5; Normal place control loop R1, the information of the scale 5 that it reads from sensor 6 detects the actual band position of intermediate transfer belt 10, to the band position of band position correction control intermediate transfer belt 10 that should be actual; Control loop R2 when unusual, it is used for producing when unusual at normal place control loop R1.
In addition, this belt-type drive device 20 has as control criterion position control loop R1 and loop control device switching time of the switching time of the control loop between the control loop R2 and the control device 70 that works when unusual.
And, in this embodiment, control loop R2 constitutes the loop of band position that drives the signal correction control intermediate transfer belt 10 of the frequency generator (FG:FrequencyGenerator) 8 that has on the belt-type drive motor 7 of intermediate transfer belt 10 based on rotation, the explanation aftermentioned that it is detailed when unusual.
It is on the color copy machine that this belt-type drive device 20 is equipped on image processing system shown in Figure 2, constitutes the intermediate transfer device.And, in this color copy machine, will normal place control loop R1 produce switch to unusual control loop R2 when unusual time as the time of removing the image formation operation, this time is controlled in the control device shown in Figure 1 70 carries out.
Color copy machine shown in Figure 2 is to use the tandem electronic imaging apparatus of intermediate transfer belt 10, uploads in paper feeding mounting table 2 and is equipped with copy device main body 1.Scanning device 3 is installed on this copy device main body 1, simultaneously, auto document paper feeding device (ADF) 4 is installed thereon.
And the substantial middle in copy device main body 1 is provided with the belt-type drive device 20 with intermediate transfer belt 10.Intermediate transfer belt 10 is hanged up between driven roller 9 and two driven vollers 15,16, and clockwise direction is rotated in Fig. 2.In addition, this intermediate transfer belt 10 remains in its surperficial remaining toner after removing graph transfer printing by the cleaning device 17 of being located at driven voller 15 lefts.
Above the straight line portion between driven roller 9 that is hung on this intermediate transfer belt 10 and the driven voller 15, the moving direction of transfer belt 10 is provided with the roller shape photoreceptor 40Y that constitutes yellow, dark green, pinkish red, black four kinds of image forming parts 18,40C, 40M, 40K (below do not having specific situation to be called photoreceptor 40 simply) respectively in the middle of it, and it can counterclockwise rotate in Fig. 2.And, be formed at each image (toner image) on this photoreceptor with directly overlapping sequence of states transfer printing on intermediate transfer belt 10.
Around this roller shape photoreceptor 40, be respectively equipped with Charging system 60, developing apparatus 61, primary transfer device 62, photoreceptor cleaning device 63, neutralizer 64.And, above this photoreceptor, be provided with exposure device 21.
On the other hand, be provided with at the downside of intermediate transfer belt 10 and become the secondary transfer printing device 22 that the image on this intermediate transfer belt 10 is transferred to as the transfer printing portion on the sheet material P of recording materials.This secondary transfer printing device 22 is the devices that hang with between two rollers 23,23 as the secondary transfer printing band 24 of endless belt, and this secondary transfer printing band 24 is crimped on the driven voller 16 by intermediate transfer belt 10.This secondary transfer printing device 22 is at the toner image on the transfer printing intermediate transfer belt 10 in the lump on the sheet material P that sends between secondary transfer printing band 24 and the intermediate transfer belt 10.
Have fixing device 25 in the sheet material conveyance direction downstream side of this secondary transfer printing device 22 with the toner image on the sheet material P, therefore, crimping backer roll 27 on as the photographic fixing band 26 of endless belt.
In addition, secondary transfer printing device 22 also has the function of the sheet material after fixing device 25 transport picture transfer printings.In addition, this secondary transfer printing device 22 also can be to use the transfer device of transfer roll and noncontact loader.
When being provided with at sheet material two sides formation image, the downside of this secondary transfer printing device 22 makes the sheet material inversion set 28 of sheet material counter-rotating.
This color copy machine when obtaining color photocopying, mounting original copy on the document board 30 of auto document feeder unit 4.In addition, when manual mounting original copy, open auto document feeder unit 4, the original copy mounting on the contact glass 32 of scanning device 3, is pushed and closed auto document feeder unit 4.
And, when depressing not shown starting switch, with the original copy mounting on auto document feeder unit 4 time, this original copy is delivered on the contact glass 32, in addition, with the original copy mounting on contact glass 32 time, directly driven sweep equipment 3, the first running bodies 33 and second running body 34 begin walking manually.Then, from the light source of first running body 33 to the original copy irradiates light, from the reflected light of this original copy face towards second running body 34, simultaneously, this light is incided on the read sensor 36 by imaging len 35 by the mirror reflects of second running body 34, reads the content of original copy.
In addition, by depressing above-mentioned starting switch, intermediate transfer belt 10 begins to rotate.Then, photoreceptor 40Y, 40C, 40M, 40K begin rotation, action yellow, dark green, pinkish red, black each monochrome image that beginning forms on this each photoreceptor.And, be formed on the intermediate transfer belt 10 of each color image on this each photoreceptor with overlap condition order transfer printing clockwise direction rotation in Fig. 2, form colored combined color image thereon.
On the other hand, by depressing above-mentioned starting switch, feed roll 42 rotations of selecteed paper feeding section in the paper feeding mounting table 2 take out sheet material P for carton 44 for selected one from paper storage unit 43, by separate roller 45 it is separated one, be transported to paper feeding road 46.
This sheet material P is transported to paper feeding road 48 in the printer main body 1 by conveying roller 47, runs into alignment roller 49 and temporarily stops.
In addition, when manual paper feeding, the sheet material P of mounting on manual pallet 51 is removed by the rotation of feed roll 50, by separate roller 52 it separated one, is transported to manual paper feeding road 53, runs into alignment roller 49, forms temporary transient halted state.
This alignment roller 49 with intermediate transfer belt 10 on the combined color image correct time of coincideing begin rotation, the sheet material P that will be in temporary transient halted state sends between intermediate transfer belt 10 and the secondary transfer printing device 22.Then, on this sheet material P by secondary transfer printing device 22 transfer of color images.
The sheet material P that transfer printing has this image carries to fixing device 25 by also having as the secondary transfer printing device 22 of conveying device function, at this by applying heat and plus-pressure photographic fixing transferred image.Then, this sheet material P discharges side by switching pawl 55 guiding, is discharged on the discharge tray 57 by distributing roller 56, in this accumulation.
In addition, when selecting the double-sided copying pattern, utilize switching pawl 55 that the sheet material P that single face is formed with image is transported to sheet material inversion set 28 sides, make its counter-rotating at this, the transfer position that leads once more, this time form image overleaf after, be discharged on the discharge tray 57 by distributing roller 56.
Illustrated as Fig. 1, this color copy machine is in the control of using normal place control loop R1, from the information that reads the scale 5 on the intermediate transfer belt 10 by sensor 6, detect the band position of the reality of intermediate transfer belt 10, according to the band position of the band position correction of this reality control intermediate transfer belt 10, the drive system of the band position detecting system and the intermediate transfer belt 10 of this intermediate transfer belt 10 is described with reference to Fig. 3 and Fig. 4.
As shown in Figure 1, the revolving force of belt-type drive motor 7 is delivered on the driven roller 9 that drives this band when rotatably hanging up intermediate transfer belt 10.
Like this, belt-type drive motor 7 makes the arrow C direction rotation of intermediate transfer belt 10 along Fig. 1 by making driven roller 9 rotation, but the transmission of revolving force therebetween also can directly carry out, and cogged betwixt can also be situated between.
On this intermediate transfer belt 10 according to the order of photoreceptor 40Y, 40C, 40M, 40K successively with the monochrome image (toner picture) of different colours formed thereon with overlapping state transfer printing.
The inner face of intermediate transfer belt 10 (also can outside), spreading all over the whole week as illustrated in fig. 3 forms the scale 5a (among Fig. 1 only diagram a part) of above-mentioned scale 5 at interval with this, the position of the bandwidth direction of this scale 5 is the position of corresponding photoreceptor end as shown in Figure 3.In addition, scale 5 also can be in the whole week of intermediate transfer belt 10, and forms in its part.
In addition, the allocation position of sensor 6 shown in Figure 1 can be the optional position so long as can the detection of straight lines shape hang up the position of scale 5 of zone face of the part of intermediate transfer belt 10 and get final product.
Example one of as shown in Figure 4, this sensor 6 is the reflection type optical sensors with for example a pair of light-emitting component 6a and light receiving element 6b, accept the reflection of light light to scale 5 irradiations by light receiving element 6b from light-emitting component 6a, at this moment, the scale 5a by scale 5 detects different reflection light quantities with its part 5b in addition.
That is, sensor 6 is owing to the difference at the scale 5a of scale 5 reflectivity different with its part 5b in addition, the signal of output High and two values of Low.
At this, for example the type of sensor 6 is sensors that light receiving element 6b receives the type of light time output High signal, if the reflectivity of the scale 5a of scale 5 forms than the part 5b height beyond it, then the signal from sensor 6 outputs becomes scale 5a by the output during the sensor 6 in the scope of the t of Fig. 4.
Therefore, the scale 5a of the sensing range according to the rotation of following intermediate transfer belt 10 and by sensor 6 has or not, as shown in figure the output of sensor 6 High, Low repeatedly.
Thus, by obtain this signal when Low changes into High to cycle (time) T that changes into High from Low, can detect the displacement (band position) on intermediate transfer belt 10 surfaces.
Foregoing is one of the method for the band position of detecting intermediate transfer belt 10 example, as long as can detect its band position by the scale that detection is formed at intermediate transfer belt 10, the kind of use therein sensor and scale can be any kind, and this detection method also can be used any detection method.
Color copy machine shown in Figure 2 as mentioned above, detect the actual band position of intermediate transfer belt 10 information of the scale 5 that reads from sensor 6, according to the band position of the band position correction of this reality control intermediate transfer belt 10, this control is all carried out in control device shown in Figure 1 70.
This control device 70 contains microcomputer, and this microcomputer is that RAM, imput output circuit (I/O) constitute by the data-carrier store of the central processing unit with various judgements and processing capacity (CPU), the ROM that stores each handling procedure and fixed data, stores processor data.
As shown in Figure 5, this control device 70 is provided with master control part 71 and motor control part 73.And, the band positional information of the intermediate transfer belt 10 that input pickup 6 detection scales 5 obtain on this motor control part 73, motor control part 73 drives the driving of the belt-type drive motor 7 of intermediate transfer belt 10 according to the information Control of this input.
Normal place control loop R1 is the band position of detecting intermediate transfer belt 10 information of the scale 5 from the intermediate transfer belt 10 that sensor 6 reads, and at the control loop that uses belt-type drive motor 7 based on the common time of this information feedback control.
In addition, when unusual control loop R2 be will be on the belt-type drive motor 7 signal feedback of subsidiary frequency generator (FG) 8 on motor control part 73, the control loop that uses when proofreading and correct band position unusual of control intermediate transfer belt 10 by the driving of control belt-type drive motor 7.
The signal feedback that control loop R2 removes the frequency generator 8 that will attach on the belt-type drive motor 7 when unusual on the motor control part 73, scrambler 38 can also be installed on the motor shaft 7a of belt-type drive motor 7 as illustrated in fig. 6, as shown in Figure 7, not with the signal of frequency generator 8 but will be somebody's turn to do signal feedback from scrambler 38 on motor control part 73.
Perhaps, be the identical Fig. 6 record of simplicity of illustration, also can along the circumferential direction form slit 39 in a distolateral periphery of the driven roller 9 of rotatably support intermediate transfer belt 10, simultaneously, with the sensor 41 that detects this slit 39 be arranged on slit 39 near, as shown in Figure 8, will be on motor control part 73 from the signal feedback of this sensor 41.
Below, further describe normal place control loop R1 and control loop R2 when unusual with reference to Fig. 9.
Thus, intermediate transfer belt 10 begins rotation, moves at the scale 5 of being with inner face to spread all over the complete cycle setting thereupon.And, read this scale 5 by sensor 6, this counted number of pulses that reads is fed back in the arithmetical unit 72 in the motor control part 73.
Therefore, arithmetical unit 72 is compared the counted number of pulses (corresponding actual band position) of objective count value (corresponding target location) and feedback, when they are identical, controller 74 is exported the signal that is used to drive belt driving motor 7, the driving of control belt-type drive motor 7, keep the target location always, but when the alternate position spike of position that obtains by feedback and the correction of target location existence needs, the signal that will be used for controlling to belt-type drive motor 7 rotating speeds of amount that should alternate position spike outputs to controller 74, proofreaies and correct the band position.
In addition, be with the detailed description aftermentioned of position correction about this.
As mentioned above, the information (signal) of the scale 5 that sensor 6 reads is input in the motor control part 73, and as Fig. 4 and shown in Figure 5, the signal that is input to this motor control part 73 is the pulse signal of double quantification.
And, in motor control part 73, to compare with objective count value (expression is from the frequency of the accumulative total position of motor starting) in the above-mentioned counted number of pulses (frequency) of giving the stipulated time inside counting of setting earlier, give the feedback quantity of belt-type drive motor 7 according to this difference control.
But if the band position of intermediate transfer belt 10 is certain, then sensor 6 detects simulating signal (the amplitude f shown in Figure 4 that the scale 5 on this intermediate transfer belt 10 is also exported
1Signal) certain, the pulse signal of its double quantification is certain too.Therefore, this moment, frequency was certain.
But, on the scale 5a of for example scale 5, as shown in figure 10, owing to produce damage SC, or adhering toner Th etc. as shown in Figure 1, making scale 5 deteriorations, said frequencies can not constitute the frequency (counted number of pulses) of regulation.
Therefore, in the color copy machine of this embodiment, motor control part 73 sensor 6 as described above detects the deterioration of scale 5 and the signal input of output, then surpass when giving the number of times of setting earlier (on every kind of type, test and wait decision), the control loop of use is switched to control loop R2 when unusual from normal place control loop R1 at this deterioration number of times (state).
Next, the normal place control and treatment of the intermediate transfer belt 10 that microcomputer carried out that control device 70 has is described with reference to Figure 12.
The microcomputer that control device 70 shown in Figure 1 has starts program shown in Figure 12 at official hour.
At first,, connect belt-type drive motor 7 in step 1, after step 2 target setting position.Thus, rotation intermediate transfer belt 10 is to the target location (motor control part 73 controls of Fig. 9).
After step 3, judge whether to import the signal that disconnects belt-type drive motor 7, if the input cut-off signal then advances to step 4, driving motor 7 is disconnected, after step 5 will finish this processing with the accumulative total removing of position, return master routine.
In addition, in the judgement of step 3, do not import cut-off signal, when advancing to step 6, at this criterion position control loop R1 regular event whether, if regular event not then advances to step 6A.
At this, judge whether to form in the operation at coloured image, if form in the operation at coloured image, then advance to step 8, if in coloured image forms operation, then do not advance to step 7, carry out the switching of the control loop of control loop R2 when the band position of proofreading and correct control intermediate transfer belt 10 unusual based on the signal of the subsidiary frequency generator (FG) 8 of belt-type drive motor 9, then, return master routine.
In addition, in the judgement of step 6, when normal place control loop R1 regular event advances to step 8, or judge by step 6A, owing to forming at coloured image when advancing to step 8 in the operation, import the signal of the sensor 6 of self feed back at this, the position of accumulative total band, the decision target location.
After step 9, from the physical location S ' on input intermediate transfer belt 10 surfaces of sensor 6.Then, after step 10, the position of carrying out target location S and physical location S ' is relatively.
Then, in step 11, judge this target location S and physical location S ' whether different (S ≠ S '), if it is identical, between it, there is not alternate position spike (permissible alternate position spike), then can be judged as intermediate transfer belt 10 on the position rotating band surface identical with target location S, therefore, proceed control at target location S always, return step 2, carry out later processing of this step 2 and judgement once more repeatedly.
In the judgement of step 11, (be not judged as "Yes") not simultaneously at target location S and physical location S ', advance to step 12, at the alternate position spike S of the belt surface of the physical location S ' of this calculated target positions S and intermediate transfer belt 10 ".
Then, after step 13 judge this alternate position spike S " whether being S "＞0, if the position S1 of S "＞0 (being judged as "Yes"); the physical location S ' that then can judge intermediate transfer belt 10 lags behind than target location S; therefore, advance to step 14, the rotating speed of control belt-type drive motor 7; make it become alternate position spike S in the S increase of target location " returns step 2 then.
In the judgement of step 13, alternate position spike S " not being S "＞0 o'clock (being judged as "No"), can judge alternate position spike S " for S "＜0, the belt surface position of the physical location S ' of intermediate transfer belt 10 is more leading than target location S, therefore, advance to step 15, at the rotating speed of this control belt-type drive motor 7, make it become from the target location that (home position) S deducts alternate position spike S " position S2, return step 2 then.
Then,, proofread and correct the physical location S ' that control makes intermediate transfer belt 10 surfaces, make it become target location S by carrying out later processing of this step 2 and judgement repeatedly.
Then, be judged as input when disconnecting the signal of belt-type drive motor 7, advance to step 4, belt-type drive motor 7 is disconnected in step 3, after step 5 will finish this processing with the accumulative total removing of position, return master routine.
In addition, the coloured image of the step 6A of Figure 12 forms operation and is to use two above photoreceptors 40 to carry out the operation that image forms, when step 6A is judged as "No" outside image that step 7 is advanced forms in the operation, be meant that the monochrome image that only uses a photoreceptor 40 to carry out forms, and forms the operation of monochromatic, dark green monochromatic, pinkish red each image of monochrome of Huang.
And when only using this photoreceptor 40 to carry out, the switching of control loop also can be carried out at any time.That is, though the time in image forms also can carry out the switching of control loop.
In addition, whether be that the signal of judgement that above-mentioned coloured image forms operation central processing unit (CPU) input of image processing system when specifying " colour " or " black and white " by the user by guidance panel is judged.
Perhaps, as shown in Figure 2, this coloured image forms device and is provided with auto document feeder unit (ADF) 4, when using auto document paper feeding device 4 to read in many original copys, the central processing unit of image processing system judges whether the original copy that reads in when this reads in end is coloured image, whether by it is that coloured image changes the linear speed that image forms, therefore, also thus the time in the linear speed condition that motor control part 73 (with reference to Fig. 5 etc.) sends judges whether to form for coloured image.
But, be located at the inboard that scale 5 on the intermediate transfer belt 10 can be located at band, also can be located at the outside.
As this embodiment, be to be difficult to pollute as being located at the advantage of band when inboard, simultaneously, also be difficult to adhere to foreign matter thereon.In addition, because scale 5 is difficult to damage, or the sensor 6 that reads this scale 5 also is located at the inboard of band, so also be difficult to pollution.
On the other hand, as scale 5 being located at the shortcoming of band when inboard, for example can not on sensor 6, using too big device and dispose the direction of this sensor and apart from limited etc.
On the contrary, be as the advantage of scale 5 being located at when outside band, few to the restriction of the configuration of the sensor 6 that reads scale, pollutes easily but produce its reverse side scale 5, or adhere to foreign matter thereon easily, and the shortcoming of easy damaged.
In the belt-type drive device 20 of this embodiment, as shown in Figure 1, be provided with scale 5 in the inboard of intermediate transfer belt 10, but still when overaging, go up to produce thin damage at scale 5a (with reference to Fig. 3 and Fig. 4), or foreign matter such as adhering toner and polluting, reflection zone face reflectivity is reduced.Thus, detect this scale 5a, the pulsed frequency of sensor 6 outputs is easy to generate unusually.
If with the band position control of intermediate transfer belt 10 is certain, then read the scale 5 on this intermediate transfer belt 10, the frequency of the pulse signal of sensor 6 outputs is certain.That is, the count value at the above-mentioned pulse signal that gives the stipulated time inside counting of setting earlier is certain.
But, produce damage SC in the part of the scale 5a of scale 5 as shown in figure 10, or when making scale 5 deteriorations at foreign matter such as the piece of the local adhering toner Tn of scale 5a as shown in figure 11, as shown in the figure, can not be from sensor 6 with amplitude f
1Output originally should the regular part of the analog output signal of output correctly.
In addition, be monopulse originally, but became dipulse.Thus, the frequency of the digital signal of double quantification (pulse) output also changes, and constitutes and the different abnormality of the frequency of benchmark (do not have to damage and during pollution etc. frequency).
When the unusual generation of this frequency, the motor control part 73 of control device 70 shown in Figure 5 based on the pulse signal control belt-type drive motor 7 of above-mentioned double quantification, therefore, can not drive this belt-type drive motor 7 with constant speed usually.Its result can not proofread and correct intermediate transfer belt 10 and control to correct band position, and therefore, it is unequal to produce chromatography when forming coloured image.
But, at the belt-type drive device 20 of this embodiment and have in the color copy machine of this device, control device 70 shown in Figure 1 is according to the deterioration state of judging the scale 5a (Fig. 3, Fig. 4) of scale 5 from the signal of sensor 6, simultaneously, when judging this scale deterioration, when surpass judging the revolution (number of times of first preset threshold is given in formation) of its deterioration, or when being judged as unusual deterioration state, control loop is switched to control loop R2 when unusual from normal place control loop R1.
That is, the frequency (count value of pulse) of the output valve of control device 70 by sensor 6 being read scale 5 and output and the frequency of giving the benchmark of setting are earlier compared, and judge the deterioration (wearing and tearing of scale 5 damages or pollution etc.) of said scale 5.Then, will judge that the number of times (also can be state) of this deterioration compares with definite value, therefore, when being judged as unusual deterioration, switch to control position R2 when unusual from normal place control loop R1.
In addition, so-called above-mentioned unusual deterioration state, for example shown in Figure 13, because a plurality of scale 5a that spread all over scale 5 pollution such as adhering toner Tn longways as shown in the figure, is than long situation of the output of giving first setting sensor 6 (pulse) stipulated time at interval.Perhaps when the sensor of two detection scales 5 is set as described later, pulse residual quantity (with reference to the α of Figure 16) situation longer between these two sensors than setting.
The process flow diagram of program of control and treatment when Figure 14 is expression intermediate transfer belt 10 unusual.
The microcomputer that control device 70 shown in Figure 1 has starts program shown in Figure 14 with official hour.
At first, the time in step 21, only handling, promptly remove in the coloured image formation operation, carry out control loop is switched to the processing of control loop R2 when unusual from normal place control loop R1 in the switching judging of control loop.
This be because, when the control loop that will use when normal place control loop R1 switches to when unusual control loop R2, because the signal that the detection signal that is used to control detects scale 5 from sensor 6 switches to signal (FG) signal of the frequency generator 8 of belt-type drive motor 7, so might on intermediate transfer belt 10, produce shift in position in the moment of switching this signal.
After step 22 in the target setting position.Thus, rotate intermediate transfer belt 10 to the target location.
From after step 23 to step 26 carry out with step 3 illustrated in fig. 12 to identical judgement of step 6 and processing (wherein, step 25 is removed the accumulative total of motor position).
Then, by the judgement of this step 26, whether criterion position control loop R1 regular event, if its malfunction then advances to step 27, if its regular event then advances to step 28.
In this step 28, judge whether it is that coloured image forms in the operation.If form in the operation at coloured image, then advance to step 27, if do not form in the operation at coloured image, then advance to step 29, by detecting scale 5, carry out the correction control of the normal place control loop R1 of FEEDBACK CONTROL by the signal that uses sensor 6 outputs, return master routine with the position.
In addition, in the judgement of step 26, when advancing to step 27 at normal place control loop R1 malfunction, or in the judgement of step 28 owing to forming for coloured image when advancing to step 27 in the operation, the FG signal that input is fed back from belt-type drive motor 7 subsidiary frequency generators (FG) 8, by the position of this FG signal accumulative total motor, after step 28A in from the physical location F ' of this FG input belt-type drive motor 7.
After step 29 in, the position of carrying out the target location F of belt-type drive motor 7 and actual position F ' is relatively.After step 30 in, judge this target location F and actual position F ' whether (F ≠ F ') inequality, if they are identical, between it, there is not alternate position spike (permissible alternate position spike), then can be judged as belt-type drive motor 7 and the belt-type drive motor shaft also be rotated, therefore, proceed control at target location F always in the position identical with target location F, return step 22, carry out later processing of this step 22 and judgement once more repeatedly.
In the judgement of step 30, (be not judged as "Yes") not simultaneously at target location F and physical location F ', advance to step 31, the alternate position spike F of the physical location F ' of calculated target positions F and belt-type drive motor 7 ".
Then, after step 32 judge this alternate position spike F " whether being F "＞0, if the position F1 of F "＞0 (being judged as "Yes"); the physical location F ' that then can judge belt-type drive motor 7 lags behind than target location F; therefore, advance to step 33, the rotating speed of control belt-type drive motor 7; it is become at target location F add alternate position spike F " returns step 22 then.
In the judgement of step 32, alternate position spike F " not being F "＞0 o'clock (being judged as "No"), alternate position spike F " being F "＜0, the physical location F ' that can judge belt-type drive motor 7 is more leading than target location F, therefore, advance to step 34, the rotating speed of control belt-type drive motor 7, make it constitute that (home position) F deducts alternate position spike F from the target location " position F2, return step 22 then.
Then,, proofread and correct the physical location F ' of belt-type drive motor 7, make it constitute target location F by carrying out later processing of this step 22 and judgement repeatedly.Then, when step 23 judges that input disconnects the signal of belt-type drive motor 7, advance to step 24, disconnect belt-type drive motor 7, after step 25 will finish this processing with the accumulative total removing of position, return master routine.
Like this, in this embodiment, from the switching of normal place control loop R1 control loop R2 when unusual and from opposite when unusual control loop R2 do not form the operation to the switching of normal place control loop R1 and carry out at coloured image, be the time removing in the coloured image formation operation switching time of this control loop.
Thus, when the toner image more than overlapping dichromatism obtains combined color image, the detection signal that is used to control is the signal from scale 5 when normal place control loop R1, when unusual, be the signal of the frequency generator 8 of belt-type drive motor 7 during control loop R2, with different from the signal of scale 5, so in the time of switching this control loop, on intermediate transfer belt 10, produce shift in position, the image of transfer printing on intermediate transfer belt 10 is easy to generate the chromatography inequality, but, can obtain not having the coloured image of chromatography inequality by becoming the above-mentioned time switching time that makes control loop.
And this control is all undertaken by control device shown in Figure 1 70.That is, in this embodiment, this control device 70 works as loop control device switching time.
And, this control device 70 produces when unusual at normal place control loop R1, switch to control loop R2 when unusual, then, when this unusual normal place control loop R1 that produces recovers normal state, remove coloured image and forming time in the operation, also carrying out the control that when unusual control loop R2 switches to normal place control loop R1.
In addition, when monochrome image forms, when normal place control loop R1 switches to when unusual control loop R2, even this control device 70 of the time in image forms also works to the device for switching of normal place control loop R1 as carrying out from this position control loop R2 when unusual.
Like this, in this embodiment, in monochrome image forms, even the time of image in forming is also carried out normal place control loop R1 and the switching of the control loop between control loop R2 when unusual.Like this, when making monochrome image when black (for example), only transfer printing (monochrome) of the same colour does not form overlapping composograph at this, so do not worry the chromatography inequality on intermediate transfer belt 10.Therefore, when making monochrome image, when judging that scale is unusual, control loop is switched to control loop R2 when unusual at once.
As mentioned above, the image processing system of this embodiment produces when unusual at normal place control loop R1 basically, carries out from the switching of this normal place control loop R1 control loop R2 when unusual.But, if when connecting image processing system, detected on the normal place control loop R1 unusually, then do not enter normal place control loop R1, and after belt-type drive motor 7 starts, enter control loop R2 when unusual at once.That is, also exist because the deterioration state of the scale 5 on the intermediate transfer belt 10 and can not switch to the situation of control loop R2 when unusual from normal place control loop R1.
Figure 15 is the summary construction diagram identical with Fig. 1 of the embodiment of the expression belt-type drive device that is provided with two sensors that read the scale that is formed at intermediate transfer belt, Figure 16 is the oscillogram of the output waveform of these identical two sensors of expression, at the part use identical symbol corresponding with Fig. 1.
The image processing system of belt-type drive device with this embodiment between photoreceptor 40C, 40M (also can 40 of photoreceptors beyond it) with sensor 6A, 6B along the mutual staggered positions configuration of the moving direction of intermediate transfer belt 10.This sensor 6A, 6B are the sensors of the identical performance of same type.Therefore, Figure 16 represent this sensor 6A, 6B detect respectively on the intermediate transfer belt 10 scale 5 and output output waveform.
And in this embodiment, control device 70 ' control makes the value of poor α of the pulse that sensor 6A, 6B export separately certain, and thus, the actual belt speed of control intermediate transfer belt 10 makes its constant speed.
Like this, the control device of intermediate transfer belt 10 is not only proofreaied and correct the band position of the intermediate transfer belt 10 that illustrates in control chart 1 grade, also detects the actual tape speed of intermediate transfer belt 10, makes the correction control of this speed fluctuation constant speed.
Among Figure 15 example when unusual control loop R2 with the signal feedback of frequency generator 8 subsidiary on the belt-type drive motor 7 to control device 70 ' (in more detail, motor control part) example on, but it is illustrated as Fig. 6, control loop R2 also can install scrambler 38 when this was unusual on the motor 7a of belt-type drive motor 7, will from the signal feedback of this scrambler 38 to control device 70 ' motor control part on.
Perhaps, Fig. 6 statement if coincide, distolateral periphery at the driven roller 9 of rotatably support intermediate transfer belt 10 along the circumferential direction forms slit 39, simultaneously, the sensor 41 that detects this slit 39 is set near slit 39, also can with from the signal feedback of this sensor 41 to control device 70 ' motor control part.
Utilizability on the industry
The present invention can be used as correctly the belt-type drive dress of necessity of the position of the band that keeps rotation or speed Put and extensive use, particularly the coloured image to the coloured image more than the on tape overlapping dichromatism forms dress It is useful putting.
Claims (5)
1, the belt-type drive device in a kind of image processing system, it comprises: the band that is formed with the rotation of the scale that is made of a plurality of scales; Read the sensor of described scale; From the described scale information that this sensor reads, detect the band position of the reality of described band, control the normal place control loop of the band position of described band according to the band position correction of this reality; Control loop when this normal place control loop produces use when unusual unusual, it is characterized in that, be provided with described normal place control loop of control and described loop control device switching time of the switching time of the control loop between control loop when unusual, the time removing in the coloured image formation operation of switching to of described control loop.
2, the belt-type drive device in a kind of image processing system, it comprises: the band that is formed with the rotation of the scale that is made of a plurality of scales; Read the sensor of described scale; From the described scale information that this sensor reads, detect the belt speed of the reality of described band, proofread and correct control and make this actual belt speed become the normal place control loop of constant speed; Control loop when this normal place control loop produces use when unusual unusual, it is characterized in that, be provided with described normal place control loop of control and described loop control device switching time of the switching time of the control loop between control loop when unusual, the time removing in the coloured image formation operation of switching to of described control loop.
3, a kind of image processing system, it has claim 1 or 2 described belt-type drive devices, it is characterized in that, described loop control device switching time produces when unusual at described standard control loop, switches to described control loop when unusual, then, when producing this unusual normal place control loop and recover normal condition, in the time in removing coloured image formation operation, carry out from described when unusual control loop switch to the control of described normal place control loop.
4, image processing system as claimed in claim 3 is characterized in that, even the time of described loop control device switching time during image forms when monochrome image forms also can be carried out the switching of described control loop.
5, a kind of control loop changing method, it is the control loop changing method of the belt-type drive device in claim 1 or the 2 described image processing systems, it is characterized in that, produce when unusual at described normal place control loop, switch to described control loop when unusual, then, when producing this unusual normal place control loop and recover normal condition, in time form in the operation except that coloured image, from described when unusual control loop switch to described normal place control loop.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP222270/04 | 2004-07-29 | ||
| JP2004222270A JP4568051B2 (en) | 2003-09-18 | 2004-07-29 | Image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1728014A CN1728014A (en) | 2006-02-01 |
| CN100440073C true CN100440073C (en) | 2008-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100875663A Expired - Fee Related CN100440073C (en) | 2004-07-29 | 2005-07-27 | Belt driving unit, method of switching control loop for the belt driving unit, and image forming apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100440073C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07140856A (en) * | 1993-06-22 | 1995-06-02 | Fuji Xerox Co Ltd | Fault detector for rotary member driving device |
| US5740492A (en) * | 1995-05-26 | 1998-04-14 | Ricoh Company, Ltd. | Color image forming apparatus |
| US6259219B1 (en) * | 1994-11-22 | 2001-07-10 | Xerox Corporation | Multiple sensor speed controller for a driven member |
-
2005
- 2005-07-27 CN CNB2005100875663A patent/CN100440073C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07140856A (en) * | 1993-06-22 | 1995-06-02 | Fuji Xerox Co Ltd | Fault detector for rotary member driving device |
| US6259219B1 (en) * | 1994-11-22 | 2001-07-10 | Xerox Corporation | Multiple sensor speed controller for a driven member |
| US5740492A (en) * | 1995-05-26 | 1998-04-14 | Ricoh Company, Ltd. | Color image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1728014A (en) | 2006-02-01 |
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