JPH02114263A - Image forming device - Google Patents

Abstract

PURPOSE:To reduce cumulative moving errors of respective driving systems and to obtain an excellent image by providing a means for measuring and storing the cumulative moving quantities of the respective driving systems and a means for controlling the relative moving speeds of the respective driving systems so that the cumulative moving quantities thereof may be coincident and correcting the deviation of the moving quantity of a recording medium by the respective driving systems. CONSTITUTION:The title device is provided with means 118 and 128 for measuring and storing the cumulative moving quantities of the respective driving systems 110 and 120 and the means 112 and 122 for controlling the relative moving speeds of the respective driving systems 110 and 120 so that the cumulative moving quantities thereof may be coincident. In the case of moving the recording medium for forming an image by plural driving systems 110 and 120, the cumulative moving quantities of the respective driving systems 110 and 120 are measured and stored. Then, the relative moving speeds of the respective driving systems 110 and 120 are controlled so that the cumulative moving quantities of the respective driving systems 110 and 120 may be coincident. Therefore, the cumulative moving quantities of the respective driving systems 110 and 120 are coincident and the positional deviation, etc., of the recording medium can be prevented from occurring even if plural driving systems 110 and 120 are used. Thus, the cumulative movement of the respective driving systems can be reduced and the excellent image can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus, and particularly to an improvement in an image forming apparatus that uses a plurality of drive systems to move a recording medium for image formation.

[Prior Art] Image forming apparatuses that form images on photosensitive recording media based on predetermined image information have been well known. Alternatively, many of them are configured to form an image of transmitted light on a photosensitive recording medium through an optical system such as a reflecting mirror, filter, or lens, and form a latent image or a visible image on the photosensitive recording medium.

In particular, many of these image forming apparatuses use a long sheet of paper wound around a roll as a photosensitive recording medium, and in this type of image forming apparatus, multiple drives are used to move the photosensitive recording medium. system is used.

In particular, the apparatus proposed in US Pat.

Then, a long photosensitive pressure sensitive sheet is moved through multiple drive systems, and a latent image is formed on the photosensitive surface by exposure, and the sheet is fed in synchronization with the photosensitive pressure sensitive sheet. Place developer paper on the surface on which the latent image is formed and pressurize it.
Thereafter, the desired developed image is obtained by heating the developing paper.

[Problems to be Solved by the Invention] Incidentally, in order to form good images using such an image forming apparatus, it is necessary to move the photosensitive recording medium using a plurality of drive systems without causing any local positional deviation. It is necessary to move accurately.

In particular, in devices that move two types of recording media, a photosensitive pressure-sensitive sheet and a developer paper, in synchronization, it is necessary to minimize the cumulative movement error caused by multiple drive systems in order to form good images. be done.

However, when multiple drive systems are used in this way, minute speed fluctuations at the start of operation and after the start of operation of the drive parts of each drive system accumulate as minute positional deviations in each drive system, causing each drive There is a problem in that the movement error of the recording medium in the system gradually increases.

In particular, in devices that use two types of recording paper, photosensitive pressure-sensitive paper and color developer paper, misalignment in each drive system is likely to occur.
When the accumulated error becomes large, there is a problem that a good image cannot be obtained.

The present invention has been made in view of such conventional problems, and its purpose is to reduce the cumulative movement error of each drive system even when a plurality of drive systems are used to move a recording medium for image formation. An object of the present invention is to provide an image forming apparatus that can obtain good images.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an image forming apparatus that uses a plurality of drive systems to move a recording medium for image formation. and a means for controlling the relative movement speed of each drive system so that the cumulative movement amount of each drive system matches, and corrects deviations in the amount of movement of the recording medium by each drive system. It is characterized by

[Effect] Next, the present invention will be explained in detail.

When the apparatus of the present invention moves a recording medium for image formation using a plurality of drive systems, the cumulative movement amount of each drive system is measured and stored.

Then, the relative moving speed of each drive system is controlled so that the cumulative movement amount of each drive system matches.

By doing this, even when using multiple drive systems, the cumulative amount of movement of each drive system always matches, and no positional deviation occurs on the recording medium, making it possible to always obtain good images. can.

Furthermore, in the device of the present invention, by resetting the cumulative movement amount of each drive system before starting the operation of each drive system,
The cumulative movement amount of each drive system after the start of operation can be made to match more reliably, and better image formation can be performed.

【Example] Next, preferred embodiments of the present invention will be described based on the drawings.

FIG. 2 shows a preferred example of a photosensitive pressure-sensitive copying machine to which the present invention is applied, and the copying machine of this embodiment is configured to be capable of full-color copying.

Incidentally, photosensitive paper (consisting of microcapsule paper and color developer paper) that enables such copying has been proposed in Japanese Patent Application Laid-Open No. 58-88739, and will not be described in detail here.

As shown in the figure, the photosensitive and pressure sensitive copying machine 10 includes an original platen glass 12 and an original platen cover 1, the top plate of which is movable in the left and right direction.
4, on which a desired original can be placed face down.

A lamp room R is provided at the upper right side of the copying machine 10, and inside this lamp room R, there is a bar-shaped halogen lamp 16 extending in a direction perpendicular to the direction of movement of the document table glass 12, and a rod-shaped halogen lamp 16 surrounding it. A light source consisting of a semi-cylindrical reflecting mirror 18 arranged as shown in FIG.

Therefore, the light emitted from the halogen lamp 16 can sequentially illuminate the entire surface of the document table glass 12 from the left end to the right end by moving the document table glass 12 in the left-right direction. The light emitted from the light source passes through the transparent original platen glass 12 and is reflected by the original placed on it. A document table cover 14 is provided to cover the document table.

In addition, in order to utilize the light emitted from the halogen lamp 16 for highly efficient illumination of the document, a beam flap 2 is installed to the left of the light source.
0 is placed, and the light that is not directed directly toward the original is reflected and used again to irradiate the original.

By the way, the temperature inside the lamp room R in which the halogen lamp 16 is provided rises due to heat generated from the halogen lamp 16.

For this reason, a fan 22 and a louver 24 are provided on the right side of the lamp room R to cool the interior of the lamp room R.

In particular, the fan 22 and the louver 24 of the embodiment are formed to efficiently apply air from the outside to the document table glass 12, and not only cool the lamp room R but also the document table glass 12 that is irradiated by the halogen lamp 16. cooling is performed at the same time.

Further, the light emitted from the halogen lamp 16 and reflected from the original placed on the original table glass 12 is filtered through a filter 26.
and enters the lens 28. The filter 26 is used to change the light transmission characteristics according to the sensitivity characteristics of the microcapsule paper 38 and adjust the tone of the copied image. The lens 28 is attached to a lens mounting plate 30, and allows minute angle adjustment with respect to the optical path.

The direction of the light focused by the lens 28 is changed by 180° by the two reflecting mirrors 32, and an image is formed on the microcapsule paper 38 closely positioned below the exposure table 34.

The two reflecting mirrors 32 are fixed to a mirror mount 36, and the optical path length and focus are adjusted by finely adjusting the mounting plate of the mirror mount 36.

On the other hand, a long microcapsule paper 38 is wound around a cartridge shaft 40 and housed in a removable cartridge 42 disposed below the document table glass 12. and pressure developing device 44
The winding shaft 46 is reached through the winding shaft 46.

That is, the microcapsule paper 38 coming out from the lower part of the cartridge 42 is transferred to the feed roller 48 and the tie roller 50.
After passing under the exposure table 34, the roller 51
and is supplied to the pressure developing device 44. Thereafter, the microcapsule paper 38 that has passed through the pressure developing device 44 is guided to a peeling roller 52 and a meandering adjustment roller 54, and then wound onto a winding shaft 46. Note that the cartridge 42
After exiting the microcapsule paper 38, the unexposed state is maintained by the light-shielding cover 56.

The transport speed of the microcapsule paper 38 is controlled to be constant by the capsule paper feed roller 58, and is made to match the moving speed of the document table glass 12.
Latent images of predetermined lines of the document are sequentially formed on the microcapsule paper 38 as it passes through.

Further, a color developer cassette 62 containing cut paper type developer paper 60 is provided below the pressure developing device 44, and the developer paper 60 is taken out one by one by a half-moon roller 64, and then transferred to a color developer roller 66 and a resist. After the leading end is aligned by the gate 68, the paper is transported to the paper entrance of the pressure developing device 44.

Therefore, the microcapsule paper 38 and the color developer paper 60 are supplied to the pressure developing device 44 in a state in which they are in close contact with each other and are integrated.

The pressure developing device 44 is composed of a small diameter roller 70 and a backup roller 72. The microcapsule surface of the microcapsule paper 38 on which the latent image is formed and the developer-coated surface of the color developer paper 60 are in contact with each other on the inside and are sandwiched between the small diameter roller 70 and the backup roller 72 and pressure is applied. .

This pressure destroys the unexposed microcapsules and forms an image on the color developing paper 60.

The microcapsule paper 38 and the color developer paper 6'0 discharged from the pressure developing device 44 are conveyed by a capsule paper feed roller 58.
The microcapsule paper 38 is separated upwardly by the peeling roller 52, and the color developer paper 60 is separated in the perpendicular direction.

After the developer paper 60 is accelerated in color development by the heat fixing device 82 and an image is formed thereon, the developer paper 60 is conveyed to a paper discharge tray 74 with the image side facing up. The heat fixing device 82 includes a hollow heat roller 78 having a heater 76 therein, and a color developing paper feed roller 80.

The separated microcapsule paper 38 is moved to the meandering adjustment roller 5
4 and then wound around a winding shaft 46.

By the way, when attempting to make a copy using such a light-sensitive and pressure-sensitive copying machine 10, first open the original platen cover 14 and place the original on the original platen glass 12, and then start copying by pressing a panel switch (not shown). After setting the number of sheets, turn on a start switch (not shown). As a result, the copying machine 10 continuously copies the set number of originals onto the developer paper 60 and sends them onto the tray 74.

That is, in the copying machine 10 of the embodiment, when the start switch is turned on, the document glass 12 first moves rightward in the figure and stops at a position where the left end of the document glass 12 faces the light source.

Thereafter, with the halogen lamp 16 turned on, the document table glass 12 is moved to the left. halogen lamp 16
After being reflected by the original, the light emitted from the filter 2
6. After being reflected by the lens 28 and two reflecting mirrors 32, the microcapsule paper 38 is located below the exposure table 34.
imaged on top.

At this time, the microcapsule paper 38 is placed on the document table glass 1.
Since the microcapsule paper 38 is moved to the left on the exposure table 34 at the same speed as the movement speed in step 2, the image on the document is formed as a latent image on the microcapsule paper 38.

As the document platen glass 12 moves to the left, the half-moon roller 6
4, the color developer paper 60 is taken out from the color developer paper cassette 62, and is supplied to the pressure developing device 44 in a superimposed state with the exposed microcapsule paper 38, and the latent image on the microcapsule paper 38 is developed. The image is transferred onto developer paper 60.

Thereafter, the developing paper 60 is thermally fixed by a thermal fixing device 82 and then discharged onto a tray 74 provided outside the copying machine 10. On the other hand, the microcapsule paper 38 that has passed through the pressure developing device 44 is sequentially wound around a winding shaft 46 . When the document platen glass 12 finishes moving to a position where its right end faces the light source, copying of the document is completed and the halogen lamp 16 is turned off.

The copying machine 10 of the embodiment performs a series of copying operations as described above.
Repeat this process for the set number of copies.

By the way, there are two types of photosensitive paper, namely, the long microcapsule paper 38 and the cut paper type developing paper 6.
In the photosensitive and pressure sensitive copying machine 10 using 0, a plurality of independent drive systems are often used to convey the photosensitive paper.

A feature of the present invention is that when a plurality of independent drive systems are used to transport the recording paper, the movement speed of each drive system is controlled so that the cumulative amount of movement of each drive system always matches, and each The purpose is to correct deviations in the amount of movement of the recording paper due to the drive system.

By doing this, it is possible to always form a good image on the recording paper, and in particular, as in this embodiment, two types of recording paper, the long microcapsule paper 38 and the cut paper type color developer paper 60, can be formed on the recording paper. Even when using paper,
An image can be formed satisfactorily on the color developing paper 60.

FIG. 1 shows control circuits for each drive system of the photosensitive and pressure-sensitive copying machine 10 of the embodiment. a second motor 120 forming a second drive system.

The first motor 110 operates on the document table glass 12.
is slidably driven, and a roller group consisting of 48, 50, and 51 is rotationally driven as a first drive system.

Further, the second motor 120 has an angle of 72.54°46.
A roller group consisting of 78 and 80 rollers is rotationally driven as a second drive system.

Further, the apparatus of the embodiment includes a first motor control device 112 that calculates and outputs a motor control signal as a control system for the first motor 110, and a first motor control device 112 that calculates and outputs a motor control signal, and a first motor control device 112 that calculates and outputs a motor control signal.
a first driver 114 that rotationally drives the motor 11;
A first encoder 11 that converts the rotation speed of 0 into a pulse train.
6 and a first cumulative operation amount register 118 that counts the pulse train of the encoder 116 and calculates the cumulative amount of movement of the recording paper from the number of revolutions of the motor 110.

Then, when a start button (not shown) is turned on, the first motor control device 112 resets the first cumulative operation amount register 118 and calculates a control signal for the first motor 110 to the driver 114. Output.

Further, in the apparatus of the embodiment, as a second control system that controls the second motor 120, a second motor control device 122 that calculates and outputs a control signal for the second motor 120 is provided.
A second driver 124 rotates the second motor 120 based on this control signal, a second encoder 126 converts the rotation speed of the motor 120 into a pulse train, and a second driver 124 rotates the second motor 120 based on the control signal. a second cumulative movement amount register 1 that records the cumulative movement amount of the recording paper No. 2;
28 are provided.

Then, when a start button (not shown) is similarly turned on, the second motor control device 120 starts the second motor control device 120.
The cumulative operation amount register 128 is reset, and a control signal for the second motor 120 is calculated and outputted to the second driver 124.

Further, the first motor control device 110 and the second motor control device 120 are connected via a transmission line 130, and the first motor control device 112 controls the motor control speed and cumulative movement amount of the first drive system. The direction is transmitted to the second motor controller 122 via the transmission line 130 .

The second motor control device 122, to which data is transmitted via the transmission line 130, controls the first motor 11.
It calculates and controls the second motor 120 to rotate at the same speed as zero, and also multiplies the cumulative movement amount sent via the transmission line 130 and the cumulative amount recorded in the second cumulative movement amount register 128. The first
The moving speed of the second motor 120 with respect to the second motor 110 is feedback-controlled.

By doing this, the first motor 110 and the second motor 120 each operate to move the recording medium at the same conveyance speed, and each motor 11
The cumulative moving amount of the moving medium based on 0.120 is controlled so as to always match.

Therefore, according to this embodiment, the microcapsule paper 3
8 and developer paper 60 are synchronized with each other without causing any positional deviation.
The latent image formed on the microcapsule paper 38 can be precisely aligned with a predetermined position on the color developer paper 60, and an image can be accurately formed on the color developer paper 60.

In particular, according to this embodiment, when the start button is turned on, the first and second cumulative operation amount registers 118,
128 is reset and then the corresponding motor 110
．． Since the count of the cumulative movement amount of 120 is started, it becomes possible to more reliably correct the positional deviation of the recording paper moved by the plurality of motors 110 and 120, and perform accurate image formation.

Note that the present invention is not limited to the above embodiments,
Various modifications can be made within the scope of the invention.

For example, in the embodiment described above, two independent motors 11
0.120 is used to move the recording paper, the present invention is not limited to this, but can also be applied to an image forming apparatus that moves the recording paper using three or more motors. be able to.

Further, in the above embodiments, the present invention has been explained by taking as an example a case where the present invention is applied to a photosensitive pressure-sensitive copying machine, but the present invention is not limited to this, and the present invention is not limited to this. It can be widely applied to devices.

[Effects of the Invention] As explained above, according to the present invention, when a recording medium is moved using a plurality of drive systems, the relative movement of each drive system is adjusted so that the cumulative movement amount of each drive system always matches. By controlling the moving speed, it is possible to minimize deviations in the amount of movement of the recording medium due to each drive system, and it is possible to form a good image.

In particular, according to the present invention, when a plurality of photosensitive papers such as microcapsule paper and developer paper are moved in synchronization with each other to form an image, it is possible to align each photosensitive paper extremely accurately. This makes it possible to form extremely accurate images.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing a preferred example of the application of the present invention to a photosensitive pressure-sensitive copying machine, and FIG. 2 is a schematic sectional view of the photosensitive pressure-sensitive copying machine of this embodiment. 10...Photosensitive and pressure sensitive copying machine, 48.50.51...Roller rotationally driven by a common motor, 46...
Winding shaft, 54, 72, 78.80... Roller driven by common motor, 110... First motor, 112... First motor control device, 118... First Cumulative operation amount register, 120... second motor,
122...Second motor control device, 128...Second
cumulative operation amount register, 130...transmission line;

Claims (2)

[Claims] (1) In an image forming apparatus that uses a plurality of drive systems to move a recording medium for image formation, a means for measuring and storing the cumulative movement amount of each drive system is provided so that the cumulative movement amount of each drive system matches. An image forming apparatus comprising: means for controlling the relative moving speed of each drive system, and correcting a deviation in the amount of movement of a recording medium by each drive system. (2) The image forming apparatus according to claim (1), further comprising means for resetting the measured cumulative movement amount of each drive system prior to the start of operation of each drive system. .