JPH02219072A - color recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color recording apparatus, and more particularly to a color recording apparatus in which images of different colors are superimposed and transferred without color shift.

[Conventional technology]

A color imager in which a latent image formed for each color component on a photoreceptor is developed in the corresponding color to form a developed image, and these developed images are superimposed and transferred onto transfer paper on a transfer belt to create a color image. Recording devices are used in color copying machines and the like.

Methods for overlapping transfer without color misregistration in this type of recording device are disclosed, for example, in Japanese Unexamined Patent Publications No. 118366/1982, No. 186282/1982, and U.S. Pat.
It is disclosed in the specification of No. 23894, the specification of US Pat. No. 402,389, etc.

JP-A-62-118366 discloses a copying apparatus equipped with a belt contact/separation means for separating a transfer sheet conveyed by a transfer belt from a photoreceptor when the transfer belt moves in a non-transfer direction. . According to this copying device,
By moving the transfer paper partially adsorbed to the transfer belt back and forth across the transfer section, overlapping copies can be made without color misregistration.

Furthermore, in Japanese Patent Application Laid-Open No. 62-186282, it is disclosed that the document table is moved by a distance corresponding to the time from the time when the document table begins to move forward and the exposure of the photoreceptor is started until the transfer is performed. A transfer belt drive device is described that cuts off rotational transmission from a drive system to a transfer belt, and then drives the transfer belt in synchronization with movement of a document table. According to this transfer belt drive vtM, it is possible to shorten the belt length of the transfer belt, downsize the apparatus, and perform overlapping copying without color misregistration.

In U.S. Pat. No. 4,023,894, a transfer belt is formed of a material such as an insulating polyurethane rubber material, a large number of pores are provided on the entire surface of the transfer belt, and a transfer paper is placed on the transfer belt. A transfer device has been proposed that performs high-quality transfer while maintaining a fixed position by vacuum suction through pores.

Further, in U.S. Pat. No. 4,025,182, a transfer belt is formed of a material such as a resistant polyurethane rubber material, a large number of pores are provided all over the transfer belt, and a transfer paper placed on the transfer belt is provided. A transfer device has been proposed that can move back and forth while maintaining a fixed position by vacuum suction through a pore.

According to this proposed device, high quality overlapping transfer can be performed without causing color shift on the transfer paper.

None of the above-mentioned prior art mentions a drive means that moves the transfer belt during transfer in accordance with the movement of the photoreceptor, but conventional drive means of this type are based on the photoreceptor drive roller. This is done using a detection signal obtained by detecting rotation.

FIG. 6 is an explanatory diagram showing the configuration of a conventional driving means,
As shown in the figure, the photoconductor 1 is attached to the photoconductor drive roller 2°3.
is wound so as to be movable, and the photoconductor drive roller 2 is driven and rotated by a photoconductor drive motor 36. Further, a photoconductor drive encoder 37 and an encoder plate 38a are attached to the photoconductor drive roller 2, and a photosensor 38 is arranged opposite to the encoder plate 38a.

A transfer belt 17 is wound between transfer belt drive rollers 18 and 19 so as to be movable in contact with the photoreceptor 1, and the transfer belt drive roller 18 is driven and rotated by a transfer belt drive motor 39. Further, a transfer belt drive encoder 40 is attached to the transfer belt drive roller 18.

On the other hand, a servo control board 42 and a servo control board 43 are connected to a main board 41 equipped with a CPU, RAN, input/output device, and counter, and a detection signal from the photosensor 38 is input to the main board 41 and servo control board 43. ing. Similarly, Kanmai.

The detection signal of the body drive encoder 37 is transmitted to the servo control board 4.
2. The signal is input to the servo control board 43 and the main board 41, and the output signal of the transfer belt drive encoder 40 is input to the servo control board 43.

A control signal is input from the servo control board 42 to the photoreceptor drive motor 36, and a control signal is input from the servo control board 43 to the transfer belt drive motor 39.

FIGS. 7(a) and 7(b) are signal waveform diagrams showing the operation of a conventional color copying machine. The print start signal shown in fil in FIG. 7(a) causes the photoreceptor drive motor 36 to
The 10FF signal (2) is supplied, and the photoreceptor drive motor 36 is driven as shown in (3).

The photoconductor drive roller 2 rotated by the drive of the photoconductor drive motor 36 is detected by the encoder plate 38a and the offset sensor 38, and a sensor signal is output as shown in (4) for each rotation. Every time you count four sensor signals, write Y data, write M data, write C data,
BK data writing is performed one after another.

Furthermore, as shown in FIGS. 7(a) and 7(b), ml<B for other loads is also determined based on the above-mentioned sensor signal.

[Problem to be solved by the invention]

In the conventional driving means described above, the encoder plate 38a attached to the photoreceptor driving roller 2 and the photosensor 38 detect and output sensor signals that serve as the basis for controlling and driving each load of the apparatus.

This sensor signal output means has a complicated structure, which poses a problem in terms of manufacturing cost.

An object of the present invention is to output highly accurate sensor signals that serve as the basis for the output timing of various signals that control the drive of each load in a device, and to output sensor signals that have a simple configuration and reduce manufacturing costs. An object of the present invention is to provide a color recording device equipped with means.

[Means to solve the problem]

The purpose is to provide a pulse generator that generates m pulses (m is an integer) in one rotation period in synchronization with the rotation of the photoreceptor and the photoreceptor drive roller that drives the photoreceptor, and to generate m pulses from this pulse generator. This is achieved by configuring the movement of the transfer belt to be controlled by pulses.

[For production]

A pulse generator generates m pulses (m is an integer) during one rotation period of the photoreceptor drive roller, and these pulses control the movement of the transfer belt, and other load controls are also generated from the pulse generator. This is done with high precision based on the pulses.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the configuration of the main parts of the embodiment, and in this figure, the same parts as those in FIG. 6 already explained are given the same reference numerals.

In FIG. 1, 1.1 is a belt-shaped photoconductor, 2.3 is a photoconductor drive roller, 17 is a transfer belt, 18.19 is a transfer belt drive roller, 36 is a photoconductor drive motor, and 37 is a photoconductor drive encoder. , 39 is a transfer belt drive motor, 4
0 is a transfer belt drive encoder, 41a is a main board, 42 is a servo control board, and 43 is a servo control board.

The configuration shown in FIG. 1 is based on the configuration shown in FIG.
a and photosensor 3'8, and connect the main board 41.
A main board 41a is provided instead of the main board 41a.

The main board 41a in FIG. 1 differs in configuration from the main board 41 in FIG. 6 in that it includes a pulse generator.

FIG. 2 is a block diagram showing the configuration of the pulse generator in this embodiment, where 44 is a crystal oscillator and 45 is a frequency dividing IC circuit (for example, 74 L S 393).

As shown in the figure, the reference frequency from the crystal oscillator 44 is divided by the frequency dividing IC circuit 45, and from the frequency dividing IC circuit 45, a CPU clock, a timer clock,
A control clock and a sequence clock are output.

In the embodiment, the sequence clock is 200
A pulse of 0 pulse/sec is output.

FIG. 3 is an explanatory diagram of the overall configuration of this embodiment, in which 1 is a photoconductor, 2.3 is a photoconductor clock roller, 4 is a charging corona device, 5 is an optical writing unit, 6 is a Y developing roller, 7 is Y
Developing device, 8 is M developing roller, 9 is M developing device, 10 is C developing roller, 11 is C developing device, ] 2 is BK developing roller, 1
3 is a BK developer, 14 is a transfer paper, 14a is a paper feed tray,
15 is a paper feed roller, 16 is a registration roller, 17 is a transfer belt, 18 and 19 are transfer belt rollers, and 20 is a contact/separation switching roller. Similarly, in FIG. 1, 21 is a transfer corona device, 22 is a static eliminating corona device, 23 is a paper adsorption charger,
24 is a paper separation charger, 25 is a transfer cleaner, 2
6 is a path switching member, 27 is a paper leading edge guide plate, 28 is a paper trailing edge guide plate, 29 is a photoconductor cleaner, 30 is a static eliminator,
31 is a fixing device, 32 is a tray, 35 is an image reading device,
C is the main body case.

In the figure, a transfer belt 17 is wound between transfer belt rollers 1B and 19 on the lower side of the main body case C, and a paper feed tray 14a1 and a paper feed roller 15, on the transfer belt roller 19 side.
A registration roller 16, a paper trailing edge guide plate 28, a transfer belt cleaner 25, and a charge eliminating corona device 22 are arranged, and a paper separation charger 24 and a path switching member 2 are arranged on the transfer belt roller 18 side.
6, a paper leading edge guide plate 27, a fixing device 31, and a tray 32 are arranged.

At approximately the center of the transfer belt 17, the photoreceptor 1 is wound between the photoreceptor drive rollers 2 and 3 in a direction perpendicular to the transfer belt eye 7, and the transfer belt 17 is sandwiched between the photoreceptor drive roller 2 and the transfer corona device. 21 are arranged.

Between the registration roller 16 and the photoreceptor drive roller 2,
A paper adsorption charger 23 and a contact/separation switching roller 20 are arranged with the transfer belt 17 in between.

Further, on the fixing device 31 side, an optical writing unit 5, a charging corona device 4, a static eliminator 30, and a photosensitive plate cleaner 29 are disposed in order from the upper side of the main body case C so as to closely face the photosensitive member l. Similarly, on the paper feed tray 14a side, in order from the upper side of the main body case C, the Y developing roller 6 and the Y developing device 7, the M developing roller 8 and the M developing device 9,
C developing roller 10, C developing device 11, BK developing roller 1
2 and a BK developing device 13 are arranged close to and facing the photoreceptor 1, and an image reading device 35 is arranged at the top of the main body case C.

FIG. 4 is a block diagram showing the connection state between each sensor and each load on the main board in this embodiment, and the same parts as in FIG. 3 are given the same reference numerals.

In the figure, 41a is a main board, 47 is an operation display section, 48 is a paper size detection sensor, 49 is a paper end detection sensor, 50 is a paper feed jam detection sensor, 51 is a paper discharge jam detection sensor, and 52 is a transfer belt contact. Distance detection sensor,
53 is a resist detection sensor, 3o is a static eliminator, 4 is a charging corona device, 24 is a paper separation charger, 23 is a paper adsorption charger, 2
2 is a static elimination corona device, 21 is a transfer corona device, 6a is a Y developing bias generator, 8a is an M developing bias generator, 10a
12a is a C developing bias generator, 12a is a BK developing bias generator 12a, 25 is a transfer belt cleaner, and 54 is a power source.

Further, 55 is a write control section, 56 is an optical reading control section, 5
7 is a servo motor, 58 is a polygon motor, 59 is a photoreceptor drive control section, 60 is a servo motor, 63 is a developing drive section, 64 is a paper feed fixing drive section, 65 is a fixing heater control section, 6
6 is a paper feed clutch, 67 is a registration clutch, 68 is a conveyance switching solenoid, 69 is a transfer belt contact/separation solenoid,
70 is a transfer belt cleaning motor.

As shown in FIG. 4, a power supply 54 is supplied to the main board 41a, and the main board 41a is connected to the paper size detection sensor 4.
It receives a sensor signal from the resist detection sensor 53 and outputs a control signal to the static eliminator 30 and the transfer belt cleaner 25.

Further, from the main board 41a, a paper feed fixing drive section 64,
Paper feed clutch 66 to transfer belt cleaning motor 7
A control signal is output to the static eliminator 30 or the transfer belt cleaner 25 in the same way.

Furthermore, the main board 41a includes an operation display section 47, a write control section 55, an optical reading control section 56, a photoreceptor drive control section 59, a transfer belt control section 61, a developing drive section 63, a paper feed fixing drive section 64, and a fixing section 64. The heater control unit 65 is connected,
The write control section 55 is connected to the optical reading control section 56,
A servo motor 57 and a polygon motor 58 are connected to the optical reading control section 56 . A servo motor 60 is connected to the photoreceptor drive control section 59, and a servo motor 62 is connected to the transfer belt control section 61.

FIGS. 5(a) and 5(b) are signal waveform diagrams illustrating the operation of this embodiment.

The operation of the embodiment will be described below with reference to FIGS. 5(a) and 5(b).

When the print switch is turned on ((1) in FIG. 5(a)), the photoconductor 1 is driven by the photoconductor drive motor 36, and the photoconductor drive roller 2 rotates clockwise, causing the photoconductor 1 to rotate clockwise.
rotates in the direction of the arrow in FIG. 3 at a linear velocity of vp.

At the same time, the transfer belt 17 is also driven by the transfer belt drive motor 3.
9, the transfer belt 17 and the transfer belt motor 39 first rotate in the normal direction ((7), (8), (10) in FIG. 5(a)).
(see speed diagram) and rotate in the direction of the left arrow at the VFO linear speed. In addition, is it controlled to rotate under the conditions of VP-VF? II is driven.

Now, the photoreceptor 1 is neutralized by the static eliminator 30 and uniformly charged over the entire surface by the charging corona device 4, and is processed so as to satisfy the following conditions 1 to 30.

1. The static eliminator 30 applies a static eliminator 30 to the surface of the belt-shaped photoreceptor 1 from which toner has been removed in advance by the photoreceptor cleaner 29.
The surface potential of the photoreceptor 1 is brought to approximately OV by irradiating light or applying a charge-eliminating corona.

2. In the case of a negative-positive process, toner adheres to uncharged areas on the surface of the photoreceptor, so the entire surface of the belt-shaped photoreceptor 1 must be uniformly charged by the charging corona device 4. .

3. The charging corona device 4 performs uniform charging by corona discharge, but the discharge generates a slight amount of ozone. This ozone decomposes in a short time when the discharge is stopped, but
It may adversely affect the surface and reduce the clarity of the image. Therefore, the influence of ozone is removed by blowing air from behind the charging corona device 4 using a fan or by suctioning it.

During one rotation period of the photoreceptor drive roller 2, the frequency dividing IC circuit 45 in FIG. 2 outputs a sequence clock as shown in (4) in FIG. 5(a). , starts controlling and driving the semiconductor laser (LD) of the optical writing unit 5 (here, an example of an LD will be explained, but other types of lasers, or other optical writing units such as an LED array or an LCD array) But that's fine)
First, start optical writing based on the 7 image data and
It forms a latent image.

This image data is sent to the image reading device 35 shown in FIG.
For example, B 1ue+ Green, Re
The three color separated lights of d are read, and based on the intensity level of each color light, image calculation processing is performed to determine Y, M.
, C, and BK (black) false writing image data. Apart from this, there are other color image processing systems (e.g. color facsimile).

Direct image data output from a word processor, personal computer, etc.) may also be used. The connection interface for this purpose may be individually supported.

By the way, the Y developing device 7~ visualizes the electrostatic latent image.

The BK developing device 13 is normally located at a position where the Y developing roller 6 to the BK developing roller 12 do not contact the belt surface of the photoreceptor 1 . Then, only from just before the latent image surface of the corresponding color reaches the position of the developing roller of each color to just after passing through, the developing device of the corresponding color is pressed leftward in FIG. The developing roller is set at a position where it comes into contact with the surface by a predetermined amount. At the same time, in order to provide only that developing device with a developing function, the developing roller and the parts contributing to development are started to be driven. ((13) to (16) in Figure 5(b))
First, since seven latent images have been formed, the Y developer 7 is applied to the photoreceptor 1 at the right timing.
Contact and drive the surface ((13) in Figure 5(b)), 7
Visualize the image.

Next is the transfer process, in which the transfer bell) 17 switches the vertical position of the contact/separation switching roller 20 so that it comes into contact with and separates from the belt surface of the photoreceptor 1 at the transfer portion (photoreceptor drive roller 2 portion). . First, when the printing operation starts, the transfer belt 17 is driven in the direction of the left arrow as described above, and then the contact/separation switching roller 20 of the transfer belt 17 is pressed to the upper position to transfer the transfer belt 17 to the photoreceptor. contact with. (Figure 5 (
(20) of b) Then, at a predetermined timing, the transfer paper 14 is fed by the paper feed roller 15, and then the timing is set so that it matches the position of the image formed on the belt surface of the photoreceptor 1. The person is transported by the registration rollers 16.

The conveyed transfer paper 14 is corona charged with a predetermined polarity by the paper adsorption charger 23 ((2) in FIG. 5(b)).
4) ), to ensure close contact with the transfer belt 17 so that the paper position does not shift during transfer. The contact/separation switching roller 20 of the transfer belt 17 mentioned above serves as a counter electrode of the paper adsorption charger 23.
The system is also used to simplify the device. Note that static electricity is removed from the transfer belt 17 by uniformly removing static electricity from the entire surface using a static eliminating corona device 22 prior to the one-color transfer process (see FIG. 5(b)).
23) ) At this time, the transfer belt cleaner 25 also performs cleaning processing.

Now, when the leading edge of the visualized seven images reaches the TS point at a predetermined distance from the transfer position 1'r point, the transfer drive motor forward rotation start signal S, ((8) in FIG. 5(a)) is activated. The information is input to a servo control board 43 that controls the transfer belt drive motor 39 shown in FIG. However, at the time point 81, it is already rotating in the normal direction, and continues to rotate in the normal direction. (Figure 5 (
(10) of a). The timing of S is essentially when the leading edge of the transfer paper is at the PT point, that is, toward the front of the transfer position T point! 1
At the time when the position 7 of the photoreceptor 11 is reached,
This is the time when the leading edge of the image reaches the point TS, which is a position 11 in front of the point T.

At this point, as shown in FIG. 5(a), the sequence clock and the number of pulses P0 of the photoreceptor drive encoder 37 in four rotation cycles of the photoreceptor drive roller 2 are counted from the start timing of writing 7 image data. Corresponding to the time points ((4), (5), (6), and (8) in FIG. 5(a)). During this time, the photoreceptor 1 moves a distance from point E (image writing position) to point TS shown in FIG.

After time t has elapsed from point 81, the leading edge of the 7th image and the leading edge of the transfer paper both move a distance of 11 and reach the transfer position T, and thereafter the 7th image is transferred by the transfer corona device 21. Time at this time 1. Photoreceptor drive encoder 3
The number of pulses of 7 is PI%, and the number of pulses of the transfer belt drive encoder 40 is PT. ((5)(1) in Figure 5(a)
1)) Here, the resolution of both encoders is, respectively,
If the belt movement dimension per one pulse is the same, then P, = PT, and if the ratio of the two is α, then P.

and PT are values corresponding to the coefficient α. Here, P
This will be explained below as a condition for +=P T I.

Now, as the 7-image transfer process progresses, the leading edge of the transfer paper separates from the transfer belt, passes over the solid line position of the transfer paper path switching member 26, and advances in the direction of the paper leading edge guide plate 27, and then 7 more images are transferred. After the transfer process progresses and the trailing edge of the transfer paper passes the point by a distance of 12, that is, from the point 81, the transfer paper moves to β.

When moving a distance of +1p (transfer paper size) +12 (
Time L++iz) The transfer drive motor reverse rotation signal causes the motor to rotate in reverse. ((9) in Figure 5(a)) (1
0)) At this time, the transfer paper 14 is at the position indicated by the two-dot chain line in FIG.

Prior to this reverse rotation, the transfer belt contact/separation switching roller 20
is lowered to the lower position to keep the transfer belt 17 apart from the belt surface of the photoreceptor 1. By reverse rotation, the transfer belt 17 and the transfer paper 14 are quickly returned in the direction of the right arrow at a speed of VR (>VF). At this time as well, due to the short return time of 1. +1. The position is controlled to the right by a distance equal to the distance moved to the left by . During this return, the trailing edge of the transfer paper is separated from the transfer belt 17, and
The transfer paper 14 moves in the direction of the paper trailing edge guide plate 28 and accurately returns a predetermined distance until the transfer paper 14 reaches the position indicated by the two-dot chain line (
It stops when the leading edge of the paper is at the RT point position, and waits (time L4) for transferring the second color M image.

On the other hand, on the photoreceptor 1, the second color M image is already being formed during the transfer of the first color seven images. That is, M
Formation of an electrostatic latent image by optical writing by controlling and driving the LD based on image data is performed at the time when the photoreceptor driving roller 2 has made an integer number of rotations from the start of Y image writing, as shown in FIG. 5 (a) in this example.
) In the case of (b), the sequence starts when the sequence crotters for four rotation periods are counted. That is, the writing start timing for each color is performed every m.times.n pulse count values, where n is the integer number of rotations of the photoreceptor drive roller 2.

Then, in the developing device, the Y image layer 7 is in contact with only the 7 image areas.
Before the second color M image area reaches the Y developing device 7, the Y developing device 7 separates from the belt surface of the photoreceptor 1, and the driving is stopped. After the seven image areas have passed, the M developing device 8 is brought into contact with the belt surface of the photoreceptor l and driven ((14) in FIG. 5(b)) before the leading edge of the M image area reaches the M image latent image area. Only, M
Visualize it into an image.

Next, when the leading edge of the M image reaches the TS point, that is, as in the case of the 7 images of the first color, from the M image data writing start timing, the photoconductor drive roller 2 is rotated 4 times and the photoconductor drive encoder 37 is pulsed. When the transfer drive motor has moved by several P rotations, a transfer drive motor normal rotation start signal St is input to the servo control board 43. At the same time or with a slight delay, the contact/separate switching roller 20 of the transfer belt starts pressing operation in the upward position direction, and is brought into contact with at least the leading edge of the light/heavy paper until it reaches the T point.

Now, at time t1 from the timing St, on the photoreceptor 1, the number of pulses of the photoreceptor drive encoder 37 becomes PI and the moving distance of the photoreceptor 1 becomes 1, as in the case of the previous seven images. So, for transfer paper, please follow this 1. During this period, the speed is increased from the state of O to VF (=VP), and during this time, the first color S, the first color 1. In this case, digit 1 control is also performed so that the two match, P=PT, so that PT is the same as the number of pulses in time. As a result, here as well, 1. The leading edge of the transfer paper is 2. It means that you have moved,
The seven images of the first color and the M image of the second color are aligned on the transfer paper.

After that, repeat the same process as above. That is, the process proceeds to M image transfer, transfer paper quick return, C image data writing, C development, C image transfer, transfer paper quick return, BK image data including sound, BK development, and BKK image transfer.

Next, the process after BKK image transfer will be explained. In the BKK image transfer process, the paper path switching member 26 switches to the position shown by the dashed-dotted line, and the transfer paper 14 undergoing the transfer process advances toward the fixing device 31 from its leading edge while being neutralized by the paper separation charger 24. Even after the transfer of the trailing edge of the transfer paper is completed, the transfer belt drive motor 39 continues to rotate normally and transfers the transfer paper 14.
The color print is conveyed to the left and fixed.
It is carried out to the tray 32 ((1) in Fig. 5(a) and (b)).
0) (21) (22) (25) ').

At this time, the transfer belt 17 is uniformly charge-eliminated by applying a charge-eliminating corona from the timing when the trailing end of the first image area passes through the charge-eliminating corona device 22 . ((2) in Figure 5(b)
3)) When performing the repeat operation as shown in Figures 5(a) and 5(b), after the first BK image data includes sound, the second Y image data is As image data is written, the operations of the transfer paper 14 and the transfer belt 17 are controlled in the same manner as from the beginning of the first sheet. still,
After the transfer, the photoreceptor 1 has residual toner removed by a photoreceptor cleaner 29, and residual charges are further removed by a static eliminator 30, and the photoreceptor 1 moves toward the charging corona device 4.

Finally, after the last color print is delivered to the tray 32 and the photoreceptor 1 and transfer belt 17 are cleaned and neutralized, the operation is stopped and the initial state is restored.

In the above description, the order of image formation is Y, M, and C.

BK, and the developer arrangement is Y, M from above.

Although C and BK have been described above, the electrostatic latent image formation of each color has been explained using a method of optical writing using an LD or the like using digitally processed image data of each color. Similar color recording can also be performed by forming an analog optical image of an ordinary electrophotographic copying machine at point E with predetermined timing position control.

Up to this point, the explanation has been about four-color overlapping recording of Y, M, C, and BK, but in the case of these two-color or three-color overlapping recording, image formation and transfer of the necessary colors are performed two times in succession. times, or 3
The operation of each part is controlled so that this process is completed in one step. In addition, in the case of monochrome recording, until the specified number of sheets are completed,
The developing device of that color is brought into contact and driven, and the transfer belt 17 is
The paper path switching member 26 remains in contact with the belt surface of the photoreceptor 1, and is held at a position where it guides the transfer paper toward the fixing device 31 to perform a recording operation.

Therefore, in repeat recording, the print production speed is 4/3 times faster and 2 times faster when three colors are used than when four colors are recorded.
Processing speed is twice as high when processing colors, and four times when processing single colors. The developing color is not limited to the above four colors, and any desired color such as Blue, Grsen, Red, etc. may be used in combination as required.

As described above, according to the present embodiment, by equipping the main board 41a with a pulse generator consisting of the crystal oscillator 44 and the frequency dividing IC circuit 45, it is possible to eliminate the need for a separate pulse generator and to use the encoder. It is possible to provide a color recording device that operates with high precision without using a sensor signal output means which is composed of a photo sensor and has a complicated structure and is disadvantageous in terms of manufacturing cost. The device is simple and compact, and manufacturing costs can be reduced.

In addition, for each pulse of mxn, that is, the photoreceptor driving roller 2
In order to start optical writing for each color every integer number of revolutions, even if there are speed fluctuations due to eccentricity of the photoconductor drive roller, images of each color are formed at the same position, and color copying without positional deviation is possible. It can be carried out.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a color recording device that stably forms high-quality color images without color shift, has a simple structure, and has a reduced manufacturing cost.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the configuration of the main parts, Figure 2 is a block diagram showing the configuration of the pulse generator, Figure 3 is an explanatory diagram showing the overall configuration, and Figure 4 is the main board, each sensor, and each load. 5 is a signal waveform diagram showing the operation, FIG. 6 is an explanatory diagram of the configuration of the driving means according to the prior art, and FIG. 7 is a signal diagram showing the operation of the color copying machine according to the prior art. FIG. 1... Photoreceptor, 2, 3... Photoreceptor drive roller, 6.
...Y developing roller, 7...Y developing device, 8...M developing roller, 9...M developing device, 10...C developing roller,
11...C developing device, 12...BK developing roller, 13
...BK developing device, 14...transfer paper, 17...transfer belt, 18.19...transfer belt roller, 35...
・Image reading device, 36... Photoreceptor drive motor, 39
... Transfer belt drive motor, 41a... Main board, 42.43... Servo control board. Figure 2

Claims (1)

[Claims] A photoreceptor is rotated at a constant speed, and multiple color-separated light images are sequentially exposed to the photoreceptor, forming electrostatic latent images for each color component. The developed images are developed and visualized using a transfer charger onto the same transfer paper that is reciprocated with respect to the photoreceptor by a transfer belt that is driven forward and backward, and the developed images are superimposed and transferred in color. In a color recording device that obtains an image, a pulse generator is provided that generates m pulses (m is an integer) in one rotation period in synchronization with the rotation of a photoconductor driving roller that drives the photoconductor, and A color recording apparatus characterized in that the movement of the transfer belt is controlled by pulses generated from a generator.