JPH03133670A - Color printer plotter - Google Patents

Abstract

PURPOSE:To hold the initial state of each color image at the time of starting writing the same by setting each of the entire periphery of the pulley, etc., of an encoder to one divided by a factor of an integer with the entire periphery of a sheet conveying belt taken as one. CONSTITUTION:The rotating speeds of rotary drums 8a, 8b in one rotation of a sheet conveying belt 9, the rotating speed of the pulley of an encoder 13, the rotating speed of a photosensitive member belt 2, rotating speeds of drums 1a, 1b and the rotating speed of the pulley of an encoder 7 are respectively set to a relation of magnification of integers. Thus, even if the conveying belt, the drums engaged with the member belt and the pulley of the encoder are slightly eccentrically deviated, the initial states of color images at the time of starting writing can be held the same, the patterns of the deviations from the ideal image positions from the images are formed in the same manner, and the superposing deviation of the images can be eliminated.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a color printer/plotter device (a general term for devices used as printers and/or plotters capable of forming multicolor images), and particularly to Electrophotographic color printer professional.

Regarding the evening equipment.

[Conventional technology]

Conventionally, this type of color printer/plotter device includes rotating drums 25a and 25, as shown in FIG.
The transfer speed is controlled to a predetermined speed by the encoder 23, which is stretched between the rotary drums 26a and 26b, and the encoder 24 is stretched between the rotary drums 26a and 26b, and the encoder 24 is stretched between the rotary drums 26a and 26b. It is known that the paper transporting belt 22 is controlled so that the transporting speed is a predetermined speed and that the paper transporting belt 22 faces the photoreceptor belt 21 at one outer peripheral surface.

In such conventional color printer/plotter devices,
Because a single color printing process included multiple exposure, development, and transfer cycles for each color of developer, it was very difficult to superimpose each color image. In particular, the rotating drum 25a around which the photoreceptor belt 21 and paper conveyance belt 22 are stretched.

25b, 26a and 26b and encoders 23 and 2
If pulley No. 4 was eccentric, each color image would deviate from its ideal image position, causing overlapping displacement of each color image.

Immediately after receiving a detection signal for the leading edge of the paper (not shown) from an image edge detection sensor (not shown), writing of image data begins by oscillating laser light from a laser light source (not shown). If so, the tip of the paper is at the tip detection position B.
The time t1 from which the photoreceptor belt 21 reaches the transfer position HA
If the time t2 for the writing tip of the paper to reach the transfer position A from the writing position C is equal, the developer image developed from the exposed image will be transferred from the tip of the paper.

xl XztI =
+11 BV,
v Because of mushrooms, x, X! V, y.

Here, V is the transfer speed of the photoconductor belt 21 detected by the encoder 23, v2 is the transfer speed of the paper conveyance belt 22 detected by the encoder 24, and xl is the photoconductor belt from the writing position C to the transfer position A. The transport distance 21 and xt represent the transport distance of the paper conveyance belt 22 from the image edge detection position B to the transfer position A, respectively.

Transport speed v1 of photoreceptor belt 21 and paper transport belt 22
If the transport speed v2 of V, ! is different, slip will occur between the photoreceptor belt 21 and the paper at the transfer position ffA. 'l/shake.

Therefore, the conveying speed V of the photoreceptor belt 21 and the conveying speed V of the paper conveying belt 22: are the encoders 23 and 2.
4, and if the transfer pressure Mx1 of the photoreceptor belt 21 and the transfer pressure Mx of the paper conveyance belt 22 are also kept constant, the color image in each exposure, development, and transfer cycle is completely Match.

However, the rotating drums 25 a, 25 b, 2
If there is eccentricity in either one of 6a and 26b (see the dashed line in FIG. 2), the photoreceptor belt 21
transport distance x1 and transport distance x of the paper transport belt 22
, changes with each exposure, development, and transfer cycle of each color image, so the time t for the image tip of the paper to reach the transfer position A
, and the time t at which the writing tip of the photoreceptor belt 21 reaches the transfer position A do not match, resulting in misalignment of color images.

Furthermore, if the pulleys of the encoders 23 and 24 are eccentric, the transfer speed v1 of the photoreceptor belt 21 and the transfer speed V1 of the paper conveyance belt 22! changes with each exposure, development, and transfer cycle of each color image, so the time [1] for the image tip of the paper to reach the transfer position A and the time 1t for the writing tip of the photoreceptor belt 21 to reach the transfer position are the same. This results in misalignment of color images.

[Problem to be solved by the invention]

In the conventional color printer/profilter device described above, 1
The color printing process involves multiple exposures.

Since it included the development and transfer cycles, if there was an eccentricity in the rotary drum or encoder pulley around which the photoreceptor belt and paper transport belt were stretched, there would be a problem that overlapping misalignment would occur for each color image. there were.

In view of the above-mentioned points, an object of the present invention is to maintain the initial state at the start of writing each color image even if there is some eccentricity in the rotary drum or encoder pulley around which the photoreceptor belt and paper transport belt are stretched. To provide a color printer/plotter device in which the pattern of deviation from the ideal image position of each color image is made the same for each color image by keeping the same, and the overlapping deviation of color images is prevented from occurring.

[Means to solve the problem]

The color printer/plotter device of the present invention includes a paper conveyor belt that is stretched between rotating drums and whose conveying speed is controlled to a predetermined speed by an encoder that connects a pulley, and a paper conveyor belt that is stretched between rotating drums and whose conveyance speed is controlled to a predetermined speed by an encoder that connects a pulley. In a color printer/plotter device, the transfer speed is controlled to be the predetermined speed by an encoder in contact with the paper, and the photoreceptor belt is opposed to the paper transport belt at one outer circumferential surface, and the entire circumference of the paper transport belt is 1, the entire circumference of the rotating drum around which the paper conveyance belt is stretched, the entire circumference of the encoder pulley connected to the paper conveyance belt, the entire circumference of the photoreceptor belt, and the entire circumference around which the photoreceptor belt is stretched. The entire circumference of the rotary drum and the circumference of the pulley of the encoder that is in rolling contact with the photoreceptor belt are each in a relationship of 1/integer.

[Effect]

In the color printer/plotter device of the present invention, the entire circumference of the paper conveyance belt is defined as 1, the entire circumference of the rotating drum around which the paper conveyance belt is stretched, the entire circumference of the encoder pulley that is in contact with the paper conveyance belt, the entire circumference of the encoder pulley that is in contact with the paper conveyance belt, the photosensitive Since the entire circumference of the body belt, the circumference of the rotating drum around which the photoreceptor belt is stretched, and the entire circumference of the encoder pulley that is in rolling contact with the photoreceptor belt are each in a relationship of 1/integer, the paper conveyance belt and Even if there is some eccentricity in the rotating drum around which the photoreceptor belt is stretched or in the encoder pulley, the initial state at the start of writing of each color image can be kept the same, and deviations from the ideal image position of each color image can be prevented. The pattern becomes the same for each color image, and no misalignment of color images occurs.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a perspective view showing a color printer/plotter device according to an embodiment of the present invention. The color printer/profilter device of this embodiment includes a photoreceptor belt 2 stretched between a pair of rotating drums 1a and lb arranged vertically parallel to each other, and a linearly stretched portion of one of the photoreceptor belts 2. Developer units 3a, 3b, 3c, and 3d for each color of yellow, magenta, cyan, and blank are arranged in close proximity to
, a cleaner 4 disposed close to the other linear stretched portion of the photoconductor belt 2 , a charging electrode 5 disposed facing the upper end of the photoconductor belt 2 , and a rotating drum 1 a are rotated. A drive motor 6, an encoder 7 that rotates a pulley on the photoreceptor belt 2 to detect the transfer speed of the photoreceptor belt 2, and a pair of rotating drums 8 arranged parallel to each other in the left and right directions.
A paper conveyance belt 9 stretched between a and 8b, a transfer pole 10 disposed opposite to the back side of a portion of the paper conveyance belt 9 close to the photoreceptor belt 2, and a lower surface of the paper conveyance belt 9. an image edge detection sensor 11 disposed opposite to the paper conveyance belt 9; a drive motor 12 that rotates the rotary drum 8a; and an encoder 13 that detects the transport speed of the paper conveyance belt 9 by rotating a pulley on the paper conveyance belt 9. and a laser light source 14,
It is composed of a polygon scanner 15.

The photoreceptor belt 2 is formed into an endless shape (ring shape) by overlapping a photoreceptor film on a base film made of a flexible material such as synthetic resin.

The paper conveyance belt 9 is formed into an endless (ring-shaped) shape using a flexible material, such as a dielectric film made of synthetic resin.

Next, the operation of the color printer/profiler device of this embodiment configured as described above will be explained.

When the color printer/plotter device is operated, the rotating drum la rotates in the clockwise direction indicated by the arrow by the driving force of the drive motor 6, and in conjunction with this, the photoreceptor belt 2 is transferred, and the rotating drum lb is driven. and rotate.

When the photoreceptor belt 2 is transferred, the outer peripheral surface of the photoreceptor belt 2 at the upper end position is first uniformly charged by discharge from the charger 5.

The uniformly charged outer peripheral surface of the photoreceptor belt 2 is exposed to light emitted from a laser light source 14 and incident through a polygon scanner 15 or the like at an exposure position that is slightly on the transfer side of the photoreceptor belt 2 than the upper end position of the rotating drum la. The electrostatic latent image is formed by exposure to a light beam.

The outer circumferential surface of the photoreceptor belt 2 on which the electrostatic latent image has been formed is further transported, and first, the developing device 3a operates and the electrostatic latent image is visualized as a developer image using yellow developer. At this time, the other developing devices 3b, 3C, and 3d have stopped their functions.

On the other hand, at the same time as the rotating drum 1a rotates, the rotating drum 8a rotates in the counterclockwise direction shown by the arrow by the driving force of the drive motor 12, and in conjunction with this, the paper conveying belt 9 is transferred.
The rotating drum 8b is driven to rotate.

On the other hand, the paper P is fed out from the roll at a predetermined timing by a paper feed roller (not shown), and the fed paper P reaches the position of the paper conveyance belt 9, and the paper P is fed out at a predetermined timing. The tip is clamped by a clamp mechanism (not shown) provided on the outer circumferential surface of the tube. After that, the paper P is transferred to the paper conveyor belt 9.
The sheet is held in a state as if attached to the sheet and is fed together with the sheet conveying belt 9.

When the paper P held on the paper transport belt 9 is fed to a transfer position close to the outer peripheral surface of the photoreceptor belt 2,
The yellow developer image formed on the outer peripheral surface of the photoreceptor belt 2 is transferred to the surface of the paper P by the discharge of the transfer pole lO. The paper P to which the yellow developer has been transferred is held by the paper conveyance belt 9 and further fed, and after a predetermined time has elapsed, it is cut into a predetermined paper size by a cutter or the like, and is further fed.

After the yellow developer has been transferred to the paper P, the outer peripheral surface of the photoreceptor belt 5 is further transported from the transfer position, and the remaining yellow developer is removed by the cleaner 4.

The paper P to which the yellow developer image has been transferred is at the transfer pole lO.
Due to the electrical charge caused by the discharge of the paper, the paper P is brought into close contact with the paper conveyance belt 9 by electrostatic force, and even if the position of the paper conveyance belt 9 holding the paper P moves downward, the paper P remains in close contact with the paper conveyance belt 9 and is fed. be done.

In this way, the exposure, development and transfer cycle of the first color image of the color printing process is completed.

Next, as in the previous cycle, the outer peripheral surface of the photoreceptor belt 2 is uniformly charged again by the discharge of the charging electrode 5, and is exposed to a light beam from the polygon scanner 15 at the exposure position, forming an electrostatic latent image. be done.

The outer circumferential surface of the photoreceptor belt 2 on which the electrostatic latent image has been formed is further transported, and the developing device 3b is activated to visualize the electrostatic latent image with a magenta developer. At this time, the other developing devices 3a, 3c, and 3d have stopped their functions.

On the other hand, the paper P sticks to the paper conveyance belt 9 and is fed together with the paper conveyance belt 9 to the transfer position again.

When the paper P held on the paper transport belt 9 is fed to the transfer position, the magenta developer image formed on the outer peripheral surface of the photoreceptor belt 2 due to the discharge of the transfer pole 10 is transferred to the paper P.
The yellow developer image is superimposed and transferred onto the surface of the image.

Paper P to which yellow and magenta developer images have been transferred
For example, the paper is held by the paper transport belt 9 and further fed.

After the magenta developer image has been transferred to the paper P, the outer peripheral surface of the photoreceptor belt 2 is also further transported from the transfer position, and the remaining magenta developer is removed by the cleaner 4.

Thus, the exposure, development and transfer cycle of the second color image of the color printing process is completed.

Similarly, the above-described cycle operation is performed by the developing devices 3c and 3, which perform development with cyan and blank developer.
d is also performed, and the exposure, development and transfer cycles of the third and fourth color images of the color printing process are completed.

As a result, a color developer image in which yellow, magenta, cyan, and blank developer images are superimposed is transferred onto the paper P.

When the transfer of the color developer image onto the paper P is completed, the clamp mechanism of the paper conveyance belt 9 releases the clamp of the paper P, the leading edge of the paper P is released, and the paper P is separated from the paper conveyance belt 9. .

The paper P separated from the paper conveyance belt 9 is transferred to the fixing device (
(not shown), the color developer image is fixed by a fixing device, and the color developer image is ejected from the color printer/plotter device.

Note that when the photoreceptor belt 2 and paper conveyance belt 9 are transported to a predetermined standby position, the drive motors 6 and 12 are stopped.

In this manner, one color printing process is completed.

Also in the color printer/plotter device of this embodiment,
Rotating drums la, lb, 8a and 8b and encoder 7 are used in the exposure, development and transfer cycles for each color image.
Although it is unavoidable that each color image deviates from the ideal image position due to the eccentricity of the pulleys 13 and 13, the pattern of the deviation should be made the same for each exposure, development, and transfer cycle of each color image. It is possible to prevent overlapping deviations of color images from occurring. To this end, it is sufficient to keep the initial state of each color image the same at the start of writing.

This is the number of rotations of the rotary drums 8a and 8b in one rotation of the paper conveyance belt 9, the number of rotations of the pulley of the encoder 13, and the number of rotations of the photoreceptor belt 2.

Rotation speed of rotating drums 1a and lb and encoder 7
This can be realized by multiplying the rotational speed of each pulley by an integer multiple. In other words, the entire circumference of the paper conveyance belt 9 is defined as 1, the entire circumference of the rotating drums 8a and 8b, the entire circumference of the pulley of the encoder 13, and the g-light belt 2.
This can be realized by making the relationship between the entire circumference of the drums 1a and 1b and the entire circumference of the pulley of the encoder 7 a fraction of an integer, respectively.

For example, for one rotation of the paper conveyance belt 9, the rotating drums 8a and 8b rotate twice, the pulley of the encoder 13 rotates four times, and the photoreceptor belt 2 rotates once.

Rotating drums la and 1b rotate twice and encoder 7
When the pulley rotates 4 times, the rotating drums la, l
b, 8a and 8b are 200 mm in diameter, the diameter of the pulley of the encoder 7 and the pulley of the encoder 13 is 100 mm, and the distance between the centers of rotating drums la and 1b and the distance between the centers of rotating drums 8a and 8b is 100 mm. xπmm may be used.

〔Effect of the invention〕

As explained above, according to the present invention, the entire circumference of the paper conveyance belt is defined as 1, the entire circumference of the rotating drum around which the paper conveyance belt is stretched, and the entire circumference of the encoder pulley that is in rolling contact with the paper conveyance belt. , the entire circumference of the photoreceptor belt, the entire circumference of the rotating drum around which the photoreceptor belt is stretched, and the entire circumference of the encoder pulley connected to the photoreceptor belt are each in a relationship of 1/integer. Even if there is some eccentricity in the rotary drum around which the conveyor belt and photoreceptor belt are stretched, or in the encoder pulley, the initial state at the start of writing of each color image can be kept the same, and the ideal image for each color image can be maintained. This has the effect of making the pattern of deviations from the position the same to prevent overlapping deviations of color images from occurring.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a color printer/plotter device according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining the occurrence of color image overlapping deviation in a conventional color blink plotter device. be. In the figure, Ia, lb/Rotating drum, 2... Photoreceptor belt, 3a, 3b, 3c, 3d - Developer, 4... Cleaner, 5... Charging electrode, 6... Drive motor, 7 ... Encoder, 8a, 8b - Rotating drum, 9 - Paper conveyance belt, 10 - Transfer pole, 11 - Image tip detection sensor, 12 - Drive motor, 13 - Encoder, 14 - Laser light source , 15... It's a polygon ski middle school.

Claims (1)

[Scope of Claims] A paper conveyance belt whose conveying speed is controlled to a predetermined speed by an encoder that is stretched between rotating drums and has a pulley in rolling contact; and an encoder that is stretched between rotating drums and has a pulley that is in rolling contact. In a color printer/plotter device, the transfer speed is controlled to be the predetermined speed, and the color printer/plotter device is provided with a photoreceptor belt that faces the paper conveyance belt at one outer peripheral surface portion, where the entire circumference of the paper conveyance belt is 1, The entire circumference of the rotating drum around which the paper conveyance belt is stretched, the entire circumference of the encoder pulley connected to the paper conveyance belt, the entire circumference of the photoreceptor belt, the rotation drum around which the photoreceptor belt is stretched. A color printer/plotter device characterized in that the entire circumference of the encoder and the circumference of the pulley of the encoder that is in rotational contact with the photoreceptor belt are in a relationship of 1/integer.