JP6888263B2 - Image forming device and drive control device - Google Patents

Description

The present invention relates to an image forming apparatus and a drive control apparatus.

Patent Document 1 describes a plurality of latent image carriers, a main scanning line deflecting means for deflecting each beam emitted from a plurality of laser light sources in the main scanning direction, and each beam deflected by the main scanning line deflecting means. Each of the latent image carriers is provided with an optical scanning device provided with a plurality of optical elements for guiding the latent image carriers, and an image forming means provided for each latent image carrier to image toner images of different colors on the latent image carriers. , The toner image formed on each latent image carrier is sequentially transferred to the recording material conveyed by the surface moving member, or the toner image is sequentially transferred to the surface of the surface moving member and then the toner image on the surface moving member. In an image forming apparatus for forming an image on a recording material by batch transferring the above to a recording material, the optical scanning apparatus includes a sub-scanning line deflecting means provided for each beam and deflecting the beam in the sub-scanning line direction. , The rotation reference position detecting means for detecting the rotation reference position of each latent image carrier, the angular velocity measuring means for measuring the angular velocity of each latent image carrier, the timing when the rotation reference position detecting means detects the rotation reference position, and A calculation means that calculates the misalignment data of each color based on the measurement result of the angular velocity measuring means, and a control means that controls the sub-scanning line deflection means so that the misalignment is canceled based on the calculated misalignment data. An image forming apparatus characterized by being provided with and is described.

Patent Document 2 is an endless moving member drive control device including a belt-shaped or drum-shaped endless moving member and a driving means for rotating the endless moving member, and the front surface or the back surface of the endless moving member. A plurality of marks are provided so as to be continuous at predetermined intervals in the moving direction, and the mark sensor that detects the mark with the movement of the endless moving member rotates in conjunction with the rotation of the endless moving member. A rotary encoder that outputs a pulse signal according to the rotation angle of the shaft member, a signal conversion means that converts a pulse signal output from the rotary encoder into a rotation speed signal, and a mark detection signal output from the mark sensor are counted. Then, the movement of the endless moving member by the driving means is performed by the counter that outputs the moving position information of the endless moving member, the rotation speed signal output from the signal conversion means, and the moving position information output from the counter. An endless moving member drive control device is described in which a control means for feedback-controlling the speed is provided.

Japanese Unexamined Patent Publication No. 2008-70802 Japanese Unexamined Patent Publication No. 2006-160512

If there is a discrepancy between the timing at which the image holder stops and the timing at which the transfer body in contact with the image holder stops, for example, the image holder is rubbed by a carrier sandwiched between the image holder and the transfer body. Therefore, there is a risk that the surface of the image holder will be scratched.

The present invention makes the surface of the low-friction photoconductor less likely to be scratched, as compared with a technique in which the difference in stop time between the transfer body and the low-friction image holder is longer than a predetermined predetermined time. It is an object of the present invention to provide an image forming apparatus and a drive control apparatus capable of capable of providing the same.

The present invention according to claim 1 has a plurality of image holders and a transfer body in which the plurality of image holders are in contact with each other and a toner image is transferred from the plurality of image holders to each other. The plurality of image holders include a low friction image holder having a friction coefficient on the surface lower than that of other image holders, and drives a first driving source for driving the transfer body and at least the low friction photoconductor. The first drive source is further provided with the second drive source, and the first drive source is provided so that the difference in stop time between the transfer body and the low friction image holder is within a predetermined predetermined time. This is an image forming apparatus in which the timing of stopping and the timing of stopping the second drive source are controlled.

The present invention according to claim 2 further includes a first measuring device for measuring the speed of the transferred body and a second measuring device for measuring the speed of the low friction photoconductor, and the first measuring device of the first measuring device. The image forming apparatus according to claim 1, wherein the timing of stopping the first drive source and the timing of stopping the second drive source are controlled based on the output and the output of the second measurement device.

The present invention according to claim 3 has a first drive source for driving a transfer body in which a plurality of image holders are in contact with each other and a toner image is transferred from the plurality of image holders to each of the plurality of image holders. At least a part of the image holders is a low friction image holder having a friction coefficient on the surface lower than that of other image holders, and the second drive source for driving the low friction image holder is used. The timing at which the first drive source and the second drive source are stopped is controlled so that the difference in the stop time between the transfer body and the low friction image holder is within a predetermined time. Control means and
It is a drive control device further having.

The present invention according to claim 4 has a plurality of image holders and a transfer body in which the plurality of image holders are in contact with each other and a toner image is transferred from the plurality of image holders to each of the plurality of image holders. The plurality of image holders include a low friction image holder having a friction coefficient on the surface lower than that of other image holders, and drives a first driving source for driving the transfer body and at least the low friction photoconductor. The first drive source is further provided with the second drive source, and the first drive source is provided so that the difference in stop time between the transfer body and the low friction image holder is within a predetermined predetermined time. This is an image forming apparatus in which a timing for stopping and a timing for stopping the second drive source are set.

According to the first aspect of the present invention, the low friction photoconductor has a lower friction photoconductor, as compared with a technique in which the difference in stop time between the transfer body and the low friction image holder is longer than a predetermined predetermined time. An image forming apparatus capable of making the surface scratch-resistant can be provided.

According to the second aspect of the present invention, the timing at which the transfer body is stopped and the timing at which the image holder is stopped can be accurately controlled by comparing the techniques that do not have the first measuring device and the second measuring device. Can be done.

According to the third aspect of the present invention, the low friction photoconductor has a lower friction photoconductor, as compared with a technique in which the difference in stop time between the transfer body and the low friction image holder is longer than a predetermined predetermined time. It is possible to provide a drive control device that can prevent the surface from being scratched.

According to the fourth aspect of the present invention, the low friction photoconductor has a lower friction photoconductor, as compared with a technique in which the difference in stop time between the transfer body and the low friction image holder is longer than a predetermined predetermined time. An image forming apparatus capable of making the surface scratch-resistant can be provided.

It is a figure which shows the structure of the image forming apparatus used in the 1st Embodiment of this invention. It is a block diagram which shows the control part which the image forming apparatus used in the 1st Embodiment of this invention has. It is a flowchart explaining the operation of the image forming apparatus used in the 1st Embodiment of this invention. The timing for stopping the motor according to the first embodiment of the present invention will be described, FIG. 4 (A) is a graph for explaining the timing for stopping the motor before adjustment, and FIG. 4 (B) is a graph for explaining the timing for stopping the motor after adjustment. It is a graph explaining the timing to stop. It is a block diagram which shows the control part which the image forming apparatus used in the 2nd Embodiment of this invention has.

Next, a mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows an image forming apparatus 10 according to the first embodiment of the present invention. The image forming apparatus 10 is also used as a drive control device, and has an image forming apparatus main body 12, and an image forming unit 100, a fixing device 200, and a paper feeding device 400 are arranged in the image forming apparatus main body 12. Has been done. Further, a transport path 450 for transporting paper, which is a recording medium, is formed in the image forming apparatus main body 12.

The image forming unit 100, for example, employs an electrophotographic method and forms an image on paper. The image forming unit 100 has, for example, four image forming units 110Y, 110M, 110C, and 110K. The image forming unit 110Y forms a yellow toner image, the image forming unit 110M forms a magenta toner image, the image forming unit 110C forms a cyan toner image, and the image forming unit 110K forms a black toner image. To do.

The image forming units 110Y, 110M, 100C, and 110K have photoconductor drums 112Y, 112M, 112C, and 112K, which are image holders, respectively. The surfaces of the photoconductor drums 112Y, 112M, and 112 are polycarbonate. The surface of the photoconductor drum 112K is coated with gallium oxide. Here, the hardness on the surface of the photoconductor drums 112Y, 112M, 112C is 4 GPa, and the hardness on the surface of the photoconductor drum 112K is 8 GPa. The surface hardness of the photoconductor drums 112Y, 112M, 112C, and 112K is a value measured by nanoin data.

As described above, by changing the surface material, the surface of the photoconductor drum 112K is made harder than the photoconductor drums 112Y, 112M, 112C, so that the photosensitivity is used more frequently than the photoconductor drums 112Y, 112M, 112C. The body drum 112K can be made less likely to wear than the photoconductor drums 112Y, 112M, 112C.

The coefficient of friction on the surface of the photoconductor drum 112K is lower than that of the photoconductor drums 112Y, 112M, 112C because the surface material is different from that of the photoconductor drums 112Y, 112M, 112C. That is. The photoconductor drum 112 is used as a low friction photoconductor.

A second motor 134, which is a second drive source, is connected to the photoconductor drums 112Y, 112M, 112C, and 112K, and rotates in response to drive transmission from the second motor 134.

A second measuring device 144 for measuring the speed of the photoconductor is attached to the photoconductor drum 112K. As the second measuring device 144, for example, a photosensor that reads a light and shade patch (not shown) formed on the shaft of the photoconductor drum 112K can be used.

The image forming unit 100 further has an intermediate transfer belt 114 which is a transfer body. Photoreceptor drums 112Y, 112M, 112C, and 112K are in contact with the intermediate transfer belt 114, and toner images are transferred from the photoconductor drums 112Y, 112M, 112C, and 112K, respectively. Further, the toner image transferred to the intermediate transfer belt 114 is transferred to the paper by the secondary transfer device 116.

The toner images held by the photoconductor drums 112Y, 112M, 112C, and 112K are formed by using a two-component developer in which the toner and the carrier are mixed. Therefore, the carrier may be attached to the surface of the photoconductor drums 112Y, 112M, 112C, 11K or the surface of the intermediate transfer belt 114.

The intermediate transfer belt 114 is supported so that it can be rotated by a plurality of indicating members, and a drive roll 118, which is one of the plurality of supporting members, transmits the drive to the intermediate transfer belt 114. The drive roll 118 is equipped with a first motor 132, which is a first drive source for driving the intermediate transfer belt 114.

Further, the drive roll 118 is equipped with a first measuring device 142 for measuring the speed of the intermediate transfer belt 114. As the first measuring device 142, for example, a photo sensor that reads a light and shade patch (not shown) formed on the shaft of the drive roll 118 can be used.

The fixing device 200 fixes the toner image transferred to the paper by the secondary transfer device 116 to the paper using, for example, heat and pressure.

The paper feeding device 400 has a storage unit 402 that stores the stacked paper, and a delivery roll 404 that feeds the paper stored in the storage unit 402 toward the transport path 450.

The transport path 450 conveys the paper from the paper feed device 400 to the position where the secondary transfer device 116 and the intermediate transfer belt 114 are in contact with each other, and further conveys the paper to the fixing device 300, and the paper is transferred from the image forming apparatus main body 12. Further transport the paper so that it is ejected to the outside.

A control unit 600 for controlling the image forming apparatus 10 is further arranged in the image forming apparatus main body 12.

In the image forming apparatus 10 configured as described above, the toner images formed on the photoconductor drums 112Y, 112M, 112C, and 112K are transferred to the intermediate transfer belt 114, and the toner images transferred to the intermediate transfer belt 114. Is transferred to the paper, and the toner image transferred to the paper is fixed to the paper by the fixing device 200.

Further, in the image forming apparatus 10 configured as described above, when the first motor 132 and the second motor 134 are stopped at the same time, the rotation of the photoconductor drum 112K having a small inertia causes the intermediate transfer belt 114 having a large inertia. May stop before the rotation of. In such a case, the surface of the stopped photoconductor drum 112K is rubbed by the intermediate transfer belt 114, and the surface of the photoconductor drum 112K is scratched by a carrier or the like adhering to the surface of the intermediate transfer belt 114 or the photoconductor drum 112K. There is a risk of sticking.

The photoconductor drums 112Y, 112M, and 112C have a larger coefficient of friction on the surface than the photoconductor drum 112K, and the friction with the intermediate transfer belt 114 is large, so that the photoconductor drums 112Y, 112M, and 112C can easily be carried around the intermediate transfer belt 114. When the first motor 132 and the second motor 134 are stopped at the same time, the timing of stopping with the intermediate transfer belt 114 is unlikely to deviate.

FIG. 2 shows a control unit 600 used as a control means. The control unit 600 has a control circuit 602, and the measurement result from the first measuring device 142 and the measurement result from the second measuring device 144 are input to the control circuit 602, and the first is obtained by the output from the control circuit 602. The motor 132 and the second motor 134 are controlled.

FIG. 3 is a flowchart showing control of the timing of stopping the first motor and the timing of stopping the second motor by the control unit 600. As shown in FIG. 3, in the first step S12, the control circuit 602 sets the photoconductor drum 112K based on the measurement result input from the first measuring device 142 and the measurement result from the second measuring device 144. The difference in stop time from the intermediate transfer belt 114 is calculated. That is, in the control circuit 602, from the time when the speed of the photoconductor drum 112K measured by the second measuring device 144 becomes 0 to the time when the speed of the intermediate transfer belt 114 measured by the first measuring device 142 becomes 0. Calculate the time of.

In step S14, which is the next step, the control circuit 602 determines whether or not the difference in the stop time between the photoconductor drum 112K and the intermediate transfer belt 114 calculated in step S12 is within a predetermined next time. When it is determined that the difference in the above-mentioned stop time is within a predetermined predetermined time, the control is terminated, and when it is determined that the difference in the above-mentioned stop time is longer than the predetermined predetermined time. , Step S16. Here, the predetermined predetermined time can be set to, for example, 20 ms.

In the next step S16, the control circuit 602 sets the timing at which the first motor 132 is stopped and the first step so that the difference in the stop time between the photoconductor drum 112K and the intermediate transfer belt 114 is within a predetermined next time. (Ii) Change at least one setting of the timing for stopping the motor 134. Then, based on this changed setting, an image is formed on the next sheet.

FIG. 4 illustrates the timing at which the first motor 132 and the second motor 134 are stopped. In FIG. 4A, line L1 shows the change in speed of the photoconductor drum 112K, and line L2 shows the change in speed of the intermediate transfer belt 114. In the example shown in FIG. 4 (A), although the first motor 132 and the second motor 134 were stopped at the same time at time t1, the photoconductor drum 112K was stopped at time t2, and the intermediate transfer belt 114 was started from time t1. It is stopped at the time t2 when the time T1 has elapsed. Here, the time T1 is longer than 20 ms, which is a predetermined primary time allowed as a difference in the stop time between the photoconductor drum 112K and the intermediate transfer belt 114.

4 (B) shows the speed of the photoconductor drum 112K after the control unit 600 controls the timing of stopping the first motor 132 and the second motor 134 based on the calculation result shown in FIG. 4 (A). The change and the change in the speed of the intermediate transfer belt 114 are shown. In FIG. 4B, line L3 shows the change in speed of the photoconductor drum 112K, and line L4 shows the change in speed of the intermediate transfer belt 114.

In the example shown in FIG. 4B, the first motor 132 is stopped at time t4, and then the second motor 134 is stopped at time t5 after a certain period of time has elapsed. As a result, the elapsed time from the time t6 at which the photoconductor drum 112K is stopped to the time t7 at which the intermediate transfer belt 114 is stopped is time T2. The time T2 is shorter than the above-mentioned time T1 and shorter than 20 msec, which is a predetermined next time allowed as a difference in the stop time between the photoconductor drum 112K and the intermediate transfer belt 114.

FIG. 5 shows the control unit 600 included in the second embodiment. In the first embodiment described above, the measurement result from the first measuring device 142 and the measurement result from the second measuring device 144 are input to the control circuit 602, and the first motor 132 and the second are based on these measurement results. The motor 134 and the motor 134 were controlled by the control circuit 602. On the other hand, in the second embodiment, the first motor 132 and the second motor 134 are set in advance and are controlled to be driven according to the timing stored in the storage unit 604.

More specifically, in the second embodiment, the first motor 132 is such that the difference in the stop time at which the intermediate transfer belt 114 and the photoconductor drum 112K are stopped is within a predetermined predetermined time. The timing for stopping the second motor 134 and the timing for stopping the second motor 134 are set, and the first motor 132 and the second motor 134 are controlled so as to drive according to this setting. Here, the predetermined predetermined time can be set to, for example, 20 ms.

In this second embodiment, before the image forming apparatus 10 is shipped, the speed of the intermediate transfer belt 114 and the speed of the photoconductor drum 112K are measured by using, for example, a laser Doppler speedometer, and the speeds of the first motor 132 and the second motor 132 are measured. The timing at which the motor 134 and the motor 134 stop rotating is determined, and this timing is stored in the storage unit 604.

10 ... Image forming apparatus 112Y, 112M, 112C, 112K ... Photoreceptor drum 114 ... Intermediate transfer belt 118 ... Drive roll 132 ... First motor 134 ... Second motor 142 ...・ First measuring device 144 ・ ・ ・ Second measuring device 600 ・ ・ ・ Control unit 602 ・ ・ ・ Control circuit 604 ・ ・ ・ Storage unit

Claims (5)

With multiple image holders,
A transfer body in which the plurality of image holders are in contact with each other and a toner image is transferred from the plurality of image holders to each of the transfer bodies.
Have,
The plurality of image holders include a low friction image holder having a lower coefficient of friction on the surface than other image holders.
The first driving source for driving the transfer body and
At least a second drive source that drives the low friction photoconductor,
Have more
The timing at which the first drive source is stopped and the second drive source are stopped so that the difference in stop time between the transfer body and the low friction image holder is within a predetermined time. An image forming apparatus in which the timing of starting a stop is controlled. The first aspect of the present invention in which the timing of starting the stop of the first drive source is earlier than the timing of starting the stop of the second drive source, and the transfer body is stopped later than the low friction image holder. Image forming device. The first measuring device for measuring the speed of the transcript and
A second measuring device for measuring the speed of the low friction photoconductor, and
Have more
Based on the output of the second measuring device and the output of the first measuring device, the claims and the timing of starting the stopping of the timing and the second driving source to start stopping the first drive source is controlled The image forming apparatus according to 1 or 2. It has a first drive source that drives a transfer body in which a plurality of image holders are in contact with each other and a toner image is transferred to each of the plurality of image holders.
At least a part of the image holders of the plurality of image holders is a low friction image holder having a lower friction coefficient on the surface than the other image holders.
A second drive source for driving the low friction image holder,
The timing for starting the stoppage of the first drive source and the second drive source is set so that the difference in stop time between the transfer body and the low friction image holder is within a predetermined time. Control means to control and
A drive control device that further has. With multiple image holders,
A transfer body in which the plurality of image holders are in contact with each other and a toner image is transferred from the plurality of image holders to each of the transfer bodies.
Have,
The plurality of image holders include a low friction image holder having a lower coefficient of friction on the surface than other image holders.
The first driving source for driving the transfer body and
At least a second drive source that drives the low friction photoconductor,
Have more
The timing at which the first drive source is stopped and the second drive source are stopped so that the difference in stop time between the transfer body and the low friction image holder is within a predetermined time. An image forming apparatus in which the timing for starting the stoppage is set.

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