JPH02110458A - Formation of picture - Google Patents

Abstract

PURPOSE:To prevent oscillation and noise in a carrying part without using a complex circuit by executing carrying for feeding the second recording medium into a press developing device at a constant speed. CONSTITUTION:When the first recording medium 37 in which a latent image is to be formed and the second recording medium 38 in which a picture is to be formed based on this latent image are guided to the press developing device having a pair of pressing means 21 and 31 and the picture is formed by pressing the first and second recording media 37 and 38, the second recording medium 38 is fed into at the constant speed under a state in which the interval between the pair of pressing means 21 and 31 is opened, and the second recording medium 38 is once stopped here. In this manner, the second recording medium 38 can be carried at the constant speed. Thus, the occurrence of the oscillation and the noise to occur when a motor which can switch a carrying speed is adopted can be prevented, further, it becomes unnecessary to adopt the complex circuit configuration in order to prevent the oscillation and the noise, and a secondary fault caused by a nip can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to the first aspect. The present invention relates to an improvement in an image forming method that includes a step of introducing a second recording medium to a pressure developing device and applying pressure to develop the second recording medium.

[Prior Art] An example of an apparatus that performs this type of image formation is a photosensitive pressure-sensitive copying machine.

As shown in FIG. 5, this photosensitive and pressure sensitive copying machine winds both ends of a microcapsule paper 100 as a first recording medium around a reel shaft (not shown) on a feeding side and a reel shaft on a winding side (not shown). An exposure section 101 and a pair of pressure rollers 102a and 102b are installed during the conveyance of the microcapsule paper 100.
The structure is such that a pressure developing device 102 having a pressure developing device 102 is provided. In the exposure section 101, the microcapsule paper 100 is exposed to the reflected light irradiated onto the original, and a latent image is formed on the microcapsule 100 paper by this exposure operation.

On the other hand, the color developing paper 103 serving as the second recording medium is led to the pressure developing device 102 in a superposed state with the exposed microcapsule paper 100. This pressure developing device 102 includes a roller 102
By sandwiching and conveying both recording media 100 and 1.03 between a and 102b, the unexposed microcapsules on the microcapsule paper 100 are destroyed by this pressure, and as a result, an image is formed on the color developing paper 103. It is designed to form a

The color developer paper 103 is stored in a layered manner in a color developer paper cassette 104, and the color developer paper 103 is taken out one by one by rotation of a paper feed roller 105, and is further transferred to the pressure developing paper 103 by a color developer paper feed roller 106. The data is sent to the device 102.

Conventionally, the conveyance speed of the color developing paper 103 is the same as the conveyance speed of the microcapsule paper 100, which is t2.

However, since the microcapsule paper 100 is exposed in the exposure unit 101, it needs to be transported at a relatively low speed that is the same as the scanning speed of the original. Since the transport bus for the color developer paper 103 is longer than the transport bus for the microcapsule paper 100, if the color developer paper 103 is transported at the same speed as the transport speed for the microcapsule paper 100, it will take longer to transport the color developer paper 103. It was going to take time. Therefore, in this type of photosensitive and pressure sensitive copying machine, one cycle time for image formation has become long.

In order to shorten the cycle time of this image forming process,
The following transportation method can be adopted.

That is, the sensor 1 is placed on the conveying path of the color developing paper 103.
07, the color developer paper 103 is conveyed at a higher speed than the conveyance speed of the microcapsule paper 100 from the paper feed roller 105 to this sensor 107, and then the color developer paper 103 is stopped at this point. put. Thereafter, this color developing paper 103 and the microcapsule paper 100 are synchronously transported in synchronization with the transport tip position of the latent image on the microcapsule paper 1oo, and sent to the pressure developing device 102. In this way, since the color developer paper 103 is stopped in advance near the pressure developing device 102, even if the color developer paper 103 is subsequently conveyed in synchronization with the microcapsule paper 100, the color developer paper 103 is stopped in the vicinity of the pressure developing device 102. The time it takes to reach this point can be shortened, and therefore the one cycle time of the image forming process can be shortened.

[Problems to be Solved by the Invention] According to the conventional method of conveying the color developing paper 103, the following problems have occurred.

That is, as the color developer paper 103 is conveyed, the sensor 1-07
The microcapsule paper is transported at high speed until it reaches , and then it is transported at low speed in synchronization with microcapsule paper]-〇〇.
It was necessary to switch to two stages of conveyance speed.

For this reason, the color developing paper 10 whose conveyance speed can be switched is
The conveyor motor for the 3rd generation must be designed with the ability to run at high speeds, so when switching to low speeds, there is too much power to spare, causing vibrations and noise when driving at low speeds. There was a problem that occurred.

In order to prevent such vibrations and noises at low speeds, an electric circuit and software are required to switch the current supplied to the motor to a weak current, resulting in a complicated configuration.

Further, according to the conventional method, the microcapsule paper 100 and the color developing paper 103 are synchronized and the pair of pressure rollers 102a
, 102b, but at this time, the conveying tips of both of them touch the pair of pressure rollers 102a, 102b.
This pair of pressure rollers],
It was necessary to perform 02a and 102b nips. If the conveyance of the color developer paper 103 is delayed even slightly, this color developer paper 10B is transferred to the pair of pressure rollers 102a,
There were times when the rollers would nip before there was no space between 102b. When such a phenomenon occurs, the pressure rollers 102a and 102b may be damaged by the microcapsule paper 100.
The rotation of this pressure roller is stopped due to the developer paper 103 being contaminated by the color developer paper 103 and being transported afterwards.
There were also situations where it would lock up.

Therefore, it is an object of the present invention to prevent the generation of vibrations and noise during the conveyance drive of color developer paper without requiring a complicated circuit, and to prevent secondary disturbances caused by delays in conveyance of color developer paper. An object of the present invention is to provide an image forming method that can reliably prevent the above problems.

[Means for Solving the Problems] The present invention provides a first recording medium on which a latent image is formed and a second recording medium on which an image is formed based on the latent image using a pair of pressure means. 1. When pressurizing the second recording medium to form an image, the second recording medium is fed between the pair of pressure means at a constant speed and stopped, with the space between the pair of pressure means opened, and at least the first When the leading edge of the recording medium where the latent image is formed is conveyed between the pair of pressure means, a pressing operation is started by driving the pair of pressure means to close.

[Function] In the image forming method of the present invention, first, the second recording medium is fed at a constant speed between a pair of pressure means in a pressure developing device, and is then temporarily stopped. in this way,
Since the second recording medium can be transported at a constant speed, it is possible to prevent the generation of vibrations and noise that would otherwise occur when a motor that can switch the transport speed is used as in the past. Therefore, there is no need to adopt a complicated circuit configuration.

Furthermore, by transporting the second recording medium between the pair of pressure means and stopping it in advance, when nipping the pair of pressure means, the second recording medium is reliably present between the pressure means. It turns out. Therefore, it is impossible for a nip to occur between the pressure means before this exists due to a delay in conveyance of the second recording medium, and a secondary failure caused by such a nip, that is, a nip caused by the pressure means caused by the first recording medium. It is possible to prevent contamination of the recording medium and a locking phenomenon of the pressure means due to the second recording medium conveyed late.

[Example] Hereinafter, an example in which the present invention is applied to a method for forming an image in a photosensitive pressure-sensitive copying machine will be specifically described with reference to the drawings.

FIG. 4 is a schematic cross-sectional view of a photosensitive pressure-sensitive copying machine that is 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. 88739/1983, etc.
It will not be detailed here.

As shown in the figure, the photosensitive and pressure-sensitive copying machine 40 is composed of a document table glass 2 and a document table cover 1, the top plate of which is movable in the horizontal direction.A desired document is placed face down on the document table glass 2. Can be placed in any condition. A light source consisting of a halogen lamp 3 extending in a direction perpendicular to the moving direction of the document table glass 2 and a semi-cylindrical reflecting mirror 4 arranged to surround it is fixed to the upper right side of the copying machine 40. Light is irradiated in a line toward the document table glass 2. Therefore, the light emitted from the halogen lamp 3 can sequentially illuminate the entire surface of the document table glass 2 from the left end to the right end by moving the document table glass 2 in the left-right direction. The light emitted from the light source passes through the transparent original platen glass 2 and is reflected by the original placed on it. A document table cover 1 is provided to cover the document table.

In addition, in order to use the light emitted from the halogen lamp 3 to irradiate the original with high efficiency, a beam flapper 5 is placed to the left of the light source, and reflects the light that is not directed toward the original and uses it again to irradiate the original. There is.

A fan 6 and a louver 7 are provided to the right of the halogen lamp to draw air from the outside. As a result, air is efficiently applied to the original platen glass 2. Light irradiated from the halogen lamp 3 and reflected from the original placed on the original platen glass 2 passes through the filter 8 and enters the lens 9.

The filter 8 is used to change the light transmission characteristics according to the sensitivity characteristics of the microcapsule paper 37 and adjust the color tone of the copied image. The lens 9 is attached to a lens attachment plate 1o, and allows minute angle adjustment with respect to the optical path.

The light condensed by the lens 9 is turned 180' by two reflecting mirrors 11, and is imaged on the microcapsule paper 37 closely positioned below the exposure table 19. The two reflecting mirrors 11 are fixed to a mirror mounting plate 12, and the optical path length and focus are adjusted by finely adjusting the mounting position of the mirror mounting plate 12.

On the other hand, a long microcapsule paper 37 is wound around a cartridge shaft 14 and housed in a removable cartridge 13 placed below the document table glass 2.
One end thereof passes through a number of rollers and a pressure developing device 20 and reaches a winding shaft 25 .

That is, the microcapsule paper 37 coming out from the lower part of the cartridge 13 is transferred to the feed roller 15. After being guided by the tie roller 17 and passing below the exposure table 19, it is supplied to the pressure developing device 20. Thereafter, the microcapsule paper 37 that has passed through the pressure developing device 20 is guided to a peeling roller 23 and a meandering adjustment roller 24, and then wound onto a winding wheel 25.

The unexposed microcapsule paper 37 after leaving the cartridge 13 is maintained in an unexposed state by the light shielding cover 16.

The transport speed of the microcapsule paper 37 is controlled to be constant by the capsule paper feed roller 22, and is made to match the moving speed of the document platen glass 2, so that the microcapsule paper 37 is Latent images of predetermined lines of the document are sequentially formed.

Further, a color developer paper cassette 32 containing cut paper type developer paper 38 is provided below the pressure developing device 2o. After the tip is aligned by the gate 35, the microcapsule paper 37
Pressure developing device 2o at a constant speed higher than the conveyance speed of
The paper is transported to the paper entrance and stopped.

The pressure developing device 20 includes a small diameter roller 21 and a backup roller 31 as a pair of pressure means. Then, the small diameter roller 21 and the backup roller 3 are brought into contact with the microcapsule surface of the microcapsule paper 37 on which the latent image is formed and the developer coated surface of the color developer paper 38 on the inside.
1 and pressure is applied. This pressure destroys the unexposed microcapsules and forms an image on the developer paper 38.

The microcapsule paper 37 and color developer paper 38 that have come out of the pressure developing device are transported by the capsule paper feed roller 22, and the microcapsule paper is transported upward by the peeling roller 23, so that the color developer paper 38 is separated from the microcapsule paper 37. be done. After the color developing paper 38 is accelerated to form an image by a thermal fixing device, a paper discharge sensor (not shown) is turned on for a predetermined period of time, and the paper is conveyed to the paper discharge tray 27 with the image side facing up. The heat fixing device is composed of two hollow heat rollers each having a heater 30 therein, and a developing paper feed roller 28.

The separated microcapsule paper passes through a meandering adjustment roller 24 and is wound around a winding shaft 25.

Next, a conveyance control system for the microcapsule paper 37 and the color developer paper 38, particularly a conveyance control system for conveying both to the pressure developing device 20, will be explained with reference to FIG.

In the figure, the control unit 50 is a CPU (not shown).

It consists of ROM RAM, etc., and the CPU is RO
When operated according to the flowchart shown in FIG. 1 stored in M, the above-mentioned transport control is controlled. This control section 50 includes the microcapsule paper feed roller 22. Half-moon roller 33. The respective roller drives 60, 6162 of the color developer paper rollers 34 are connected, and these are connected to the control unit 5.
The drive control is executed at 0. Further, a sensor 51 for detecting the presence of the color developer paper 38 is arranged in the middle of the conveyance path of the color developer paper 38 between the resist gate 35 and the pressure developing device 2° (see FIG. 4). The sensor 51 is connected to the control section 50. A signal indicating that the sensor 51 has confirmed that the color developing paper 38 has passed is manually sent to the control section 50.

The control section 50 is also configured to close the pair of pressure rollers 21 and 31 in the pressure developing device 2°, and is connected to the pressure port-roller pressing section 52 for this purpose. ing. Then, at a predetermined timing when the microcapsule paper 37 on which the latent image is formed and the color developer paper 38 are superimposed, the pressure roller pressing section 52 is driven to perform a closing drive.

The operation of the device configured as described above will be explained below.

Now, after opening the document table cover 1 and placing the document on the document table glass 2, if you press the start button (not shown), the document table glass 2 will first move to the right in FIG. The base glass 2 stops at a position where the left end faces the light source. After that, with the halogen lamp 3 turned on,
Move the document table glass 2 to the left. The light emitted from the halogen lamp 3 is reflected by the original, then reflected by the filter 8, lens 9, and two reflection mirrors 11, and then transferred to the microcapsule paper 37 located below the exposure table 19.
imaged on top. At this time, the microcapsule paper 37 is moved to the left on the exposure point 19 at the same speed as the moving speed of the document table glass 2, so the image on the document on the document table is hidden on the microcapsule paper 37. Formed as an image.

Here, the transport operation of the microcapsule paper 37 and the color developer paper 38 to the pressure developing device 20, and the developing operation in this pressure developing device will be explained with reference to the flowchart of FIG.

First, the control unit 50 executes and controls the operation of taking out a sheet of color developer paper 38 from the color developer paper cassette 32. For this purpose, the half-moon roller 33 is driven to frictionally send out the uppermost sheet of color developer paper 38 in the color developer paper cassette 32 (step 1).

Next, the color developer paper roller 34 is driven at the timing when the conveyed leading end of the color developer paper 38 taken out reaches the nip portion of the color developer paper roller 34 (step 2).

In this embodiment, the conveyance speed of the color developer paper 38 by the color developer paper roller 34 is set to be higher than the conveyance speed of the microcapsule paper 37.

Thereafter, the control section 50 waits for the input of a signal indicating that the leading end of the conveyance of the color developer paper 38 has been detected by the sensor 51 disposed ahead of the color developer paper roller 34 . and,
As shown in FIG. 3(A), this sensor 51 detects the color developing paper 3.
8 is detected (step 3), for example, if the drive motor of the color developing paper roller 34 is a step motor, the number of pulses for driving this step motor is determined by the number of pulses detected by the sensor 51. After the detection, a count is made until a predetermined number is reached (step 4), and after this predetermined number of pulses have been driven, the driving of the color developing paper roller 34 is stopped (step 5). This predetermined number of pulses means that the color developing paper 38
After the conveyance tip of is detected by the sensor 51, the conveyance tip is located between the pair of pressure rollers 21 and 31, more specifically, the conveyance tip is located between the contact point of both the rollers 21 and 31. until you reach a position slightly beyond the
The number of pulses is set to convey the color developing paper 38. Therefore, the developer paper 38 is stopped at the position shown in FIG. 3(B).

Note that at this time, the pair of pressure rollers 21 and 31 are open.

In this way, according to this embodiment, by driving the color developer paper 38 at a higher speed than the microcapsule paper 37 transport speed, the color developer paper 38 is transported on a relatively long transport bus. As a result, the copy operation time for one cycle does not become longer due to the delay in conveyance time of the color developing paper 38 as in the conventional case. In addition, in this embodiment, the color developer paper 38 is conveyed to the pressure developing device 20 at a constant speed, so the motor for driving the color developer paper roller 34 is controlled to be switched to two speeds as in the conventional case. There's no need to. Therefore, the developer paper 38
It is possible to prevent harmful effects such as vibration of the motor and noise caused by this vibration when the transport is driven. Furthermore, in this embodiment, before the tip of the latent image forming position of the microcapsule paper 37 reaches between the pair of pressure rollers 21 and 31, the conveyance of the color developing paper 38 between the rollers 21 and 31 has already been completed. ing. Therefore, when only the microcapsule paper 37 is present between the two rollers 21 and 31, the phenomenon that the roller nip is completed cannot occur, and therefore the roller 21.3 that occurs due to this phenomenon cannot occur.
1 contamination does not occur. Furthermore, since the developer paper 38 is not conveyed later than the microcapsule paper 37, it is possible to reliably prevent the roller locking phenomenon caused by the delay in conveyance of the color developer 38.

While the developer paper 38 is being conveyed as described above, the aforementioned optical scanning of the original on the original glass 2 and the exposure operation of the microcapsule paper 37 using the reflected light obtained by this optical scanning are progressing. I will do it. During this exposure operation, the capsule paper feed roller 22 is driven to transport the microcapsule paper 37 at a constant speed (same speed as the original scanning speed). When the drive motor of this capsule paper feed roller is configured as a pulse motor, for example, by counting the number of pulses from the start of driving of this motor, the tip of the latent image formed on the microcapsule paper 37 is the position is,
It is possible to detect the timing between the pair of pressure rollers 2131.

Here, the pressure development by the pair of pressure rollers 21 and 31 must be reliably carried out from the conveyance tip position of the latent image on the microcapsule paper 37.

Therefore, the start timing for closing the pair of pressure rollers 21, 31 is such that the position of the conveying tip of the latent image on the microcapsule paper 37 is
It is set before reaching the first contact position, and when the conveyance tip position of the latent image reaches the contact position, it is necessary that the nip between both rollers 21 and 31 has already been completed. Therefore, the control section 50 detects the conveyance tip position of the latent image on the microcapsule paper 37 by, for example, counting the number of pulses as described above (step 6), and when this reaches a predetermined position, the pressure roller pressing section 52 to start nip driving of the rollers 21 and 31 (step 7).

Then, as described above, a pair of pressure rollers 21.31
When the nip is completed, the microcapsule paper 37 and the color developer paper 38 existing between the rollers are synchronized by continuously transporting the microcapsule paper 37 at a constant speed by the capsule paper feed roller 22. It will be transported. A microcapsule paper 37 is placed between a pair of pressure rollers 21 and 31. Pressure development is performed by synchronously conveying the color developing paper 38 (step 8). That is, the microcapsule paper 37
The upper latent image is developed and transferred onto the developing paper 38.

Thereafter, the color developing paper 38 is thermally fixed by a thermal fixing device, and the microcapsule paper 37 that has passed through 20 is sequentially wound around the winding shaft 25. When the document platen glass 2 is moved to a position where its right end faces the light source, copying of the document is completed and the halogen lamp 3 is turned off.

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

For example, the timing detection for stopping the color developer paper 38 between the pair of pressure rollers 21 and 31 is not limited to counting the number of pulses for driving the pulse motor after passing through the sensor 51 as described above. It is also possible to adopt a configuration in which the control is performed by measuring the time from the start of driving of the color paper roller 34, or a sensor is provided near the pair of pressure rollers 21, 31 to detect the conveyance tip of the color developer paper 38. . Similarly, after confirming the position of the conveying tip of the latent image on the microcapsule paper 37, the pair of pressure rollers 21, 3
Regarding the timing of performing the closing drive in step 1, a method such as controlling the transport time of the microcapsule paper 37 can be adopted.

Furthermore, although the above embodiment is applied to an image forming method in a photosensitive pressure-sensitive copying machine as an example of an image forming apparatus, it is also possible to use a first recording medium on which at least a latent image is formed, and an image formed on the basis of this latent image. It is possible to apply the second recording medium to various other image forming methods such as pressure development using a pressure development device.

[Effects of the Invention] As explained above, according to the present invention, the second recording medium is transported at a constant speed to feed the second recording medium into the pressure developing device. It is possible to prevent the vibration of the conveyance unit and the accompanying noise that occur when switching between stages, without using a complicated circuit. Moreover, before the latent image conveyance tip on the first recording medium is conveyed between the pair of pressure means, the second recording medium is conveyed in advance between the side pressure means, so that the first recording medium is conveyed between the side pressure means. A situation where the nip is completed when only the medium is present between the side pressure means can be reliably prevented, and contamination of the rollers can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing an example of the operating procedure when the image forming method of the present invention is carried out using a photosensitive pressure-sensitive copying machine;
FIG. 2 is a block diagram showing an example of the configuration of a control system for realizing the transport operation shown in FIG. 1, and FIGS. 3 (A) and (B)
FIG. 4 is a schematic cross-sectional view of a photosensitive pressure-sensitive copying machine which is an example of an apparatus for carrying out the image forming method of the present invention, and FIG. is the first
2 is a schematic explanatory diagram for explaining the conventional transport drive of the second recording medium. 20... Pressure developing device, 21.31... Pair of pressure means, 19... Exposure section, 37... First recording medium, 38...
... second recording medium, 50 ... control section, 51 ... sensor, 52 ... pressure roller pressing section.

Claims (1)

[Claims] (1) A first recording medium on which a latent image is formed and a second recording medium on which an image is formed based on this latent image are introduced into a pressure developing device having a pair of pressure means, When pressurizing the second recording medium to form an image, the second recording medium is fed between the pair of pressure means at a constant speed and stopped, with the space between the pair of pressure means opened, and at least the first recording medium is An image forming method comprising: starting a pressing operation by driving the pair of pressure means to close when the leading edge of the medium where the latent image is formed is conveyed between the pair of pressure means.