JPH03296750A - Pressure developing 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 [Industrial Field of Application] The present invention relates to a pressure developing device in a copying machine or the like using photosensitive pressure sensitive paper.

[Prior Art] An exposure device that selectively exposes a photosensitive pressure-sensitive paper (for example, microcapsule paper) based on an image of a document to be copied, and a pressure developing device that develops a selectively exposed latent image on the photosensitive pressure-sensitive paper onto a color developer paper. As shown in FIG. 7, the pressure developing device in a copying machine that has a built-in heat fixing device that fixes the developed image by heating the developed color developer paper has two rotating bodies l, which are close to each other in parallel. 2, the microcapsule paper 3 and the color developer paper 4 are superimposed and passed through them, and the two rotating bodies 1 and 2 apply pressure to the microcapsule paper 3 and the color developer paper 4 in a widthwise linear manner.
A structure in which a latent image on microcapsule paper 3 is developed on color developing paper 4 is common.

Note that one of the two rotating bodies 1.2 is a large-diameter work roller 1, and the other is a small-diameter work roller 2. The microcapsule paper 3 and the color developing paper 4 are pressed against a large-diameter work roller l. The surface of the microcapsule paper 3 is coated with microcapsules containing a dye precursor, etc. that reacts with a color developer described below, while the surface of the color developer paper 4 contains microcapsules that contain a dye precursor that reacts with the dye precursor described below. A color developer that develops color to form an image is applied, and when the microcapsule-coated surface of the microcapsule paper 3 and the color developer-coated surface of the color developer paper 4 are brought into contact and pressure is applied, the microcapsule paper is Only the unexposed microcapsules of No. 3 were destroyed,
The contained dye precursor etc. are exposed, and this is exposed to the color developing paper 4.
An image is formed by reacting with a color developer to develop color.

After this development is completed, the microcapsule paper 3 and the color developer paper 4 are separated, the microcapsule paper 3 is wound up on the winding shaft 6, and the color developer paper 4 is sent to the heat fixing device 7.

[Problems to be Solved by the Invention] Copying machines generally have functions such as an enlarged copying function and a reduced copying function in addition to the same-size copying function. Also, since the optimum exposure amount is different when copying at 1:1, when copying at enlarged size, and when copying at reduced size, - For boat fishing, set the exposure speed and the same pressure development speed to 1:1, enlarged, and reduced copy mode. The changes are made in stages according to the switching. That is, in the pressure developing device shown in FIG. 6, two rotating bodies 1,
The pressure force between the two is set to an appropriate value for full-size copying, and when switching from full-size copying to enlarged copying, for example, the exposure speed and pressure development speed are reduced to, for example, 5 mm/sec. . However, in this case, there is a problem in that the white area of the developed output image becomes darker than it actually is, and the quality of the output image deteriorates.

In the present invention, if the cause of such problems in the quality of the output image is that the pressure development speed during enlarged copying is lower than the pressure development speed during full-size copying, the pressure development force at this time is lower than the pressure development speed during photosensitive This was done by focusing on the fact that the value suitable for pressure development of press paper, that is, when the light-sensitive pressure-sensitive paper is microcapsule paper, is much stronger than the appropriate value that would destroy the microcapsules. The purpose of the present invention is to provide a pressure developing device capable of constantly developing stable and good output images by changing the pressure developing speed accordingly and also by changing the pressing force of the photosensitive pressure sensitive paper and the color developing paper in stages. There is.

[Means for Solving the Problem] In order to achieve the above object, the pressure developing device of the present invention has a
) first and second rotating bodies that pressurize and develop the photosensitive pressure-sensitive paper and the color developer paper; b) a fixing member that rotatably supports the first rotating body in a fixed position; and C) the second rotating body. a swinging member that rotatably supports the body and is arranged to be movable back and forth in a predetermined direction in which a second rotating body approaches and leaves the first rotating body; a pressurizing drive unit that presses and moves the second rotary body as appropriate in a direction in which the first rotary body is pressed via a supported pressurizing force adjusting means; and e) the swinging member caused by the pressurizing drive unit. and a pressurizing force control section that variably controls the amount of movement of the photosensitive pressure sensitive paper in accordance with the moving speed of the photosensitive and pressure sensitive paper passing between the first and second rotating bodies.

[Operation] The pressurizing force control unit in the pressure developing device of the present invention having the above configuration variably controls the movement amount of the swinging member in stages based on the copy mode switching signal, thereby controlling the first and second rotations. By variably controlling the pressure applied by the body to the photosensitive pressure-sensitive paper and the color developing paper, it is possible to select the appropriate pressure according to the pressure and development speed during full-size copying, enlargement copying, and reduction copying. , the output image quality is good and stable.

[Example] Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 6.

FIGS. 1 and 2 show a front view and a sectional view of the pressure developing device according to the embodiment during the developing operation, and the microcapsule paper 3 and the color developing paper 4 as photosensitive and pressure sensitive paper are indicated by dashed dotted lines, respectively. This is how it appears. The pressure developing device shown in the figure consists of a pair of rotating bodies that pressurize the microcapsule paper 3 and the color developing paper 4 between them, that is, a large-diameter work roller 1o as a first rotating body and a small-diameter workpiece as a second rotating body. The roller U, a pair of left and right plate-shaped base plates 12, 12 serving as fixed members that hold the large-diameter work roller 10 horizontally and rotatably support both ends thereof, and the second rotating body 11 horizontally. A pair of left and right plate-shaped side plates 13.13 as swinging members that are held and rotatably supported at both ends thereof.
and pressurizing force adjusting means 14.14 attached to the lower part of each of the pair of side plates 13.13, and pressing the side plate 13.13 appropriately via this pressurizing force adjusting means 14.14 to adjust the small diameter work roller 11. The pressure drive unit 15 is configured to press the large-diameter work roller 10 , and the pressure control unit 16 is configured to control the drive of the pressure drive unit 15 .

This will be explained more specifically in detail. Base plate 12.
12 is a first rotating body IO fixed at a fixed position in the copying machine.
support. The upper portions of a pair of side plates 13.13 are connected to the inner surfaces of each of the pair of base plates 12.12 by a shaft 17 so as to be rotatably swingable in the vertical direction. A small-diameter work roller 11 is mounted on the inner surface of the upper part of a pair of side plates 13.13, and a backup roller 1 that is in constant contact with the small-diameter work roller 11
8 is rotatably supported, and the side plate 13
．． A pair of pressurizing force adjusting means 14.14 is provided on the inner surface of the lower part of 13.
is fixed. The side plate 13.13 has a shaft 17 as a fulcrum, and the small diameter work roller 11 is connected to the large diameter work roller 1.
It rotates back and forth in the direction of approaching and away from 0.

The pair of pressurizing force adjustment means 14.14 have the same structure, and one of them will be explained based on FIGS. and nuts 22 a, 22 b, and 1
Each pressure bolt 23 and cap 24 are provided.

A pair of blocks 20, 20 sandwich the pressure spring 19 and are held compressed to an appropriate length by a pressure bolt 23 and a nut 22a. The cap 24 attached to the tip of the pressure bolt 23 has a tap (not shown), and the stroke length of the tip surface of the cap 24 can be adjusted to an appropriate size using the cap 24 and the nut 22b. and fixed. This pressurizing force adjusting means 14 is installed in a block 20 at a window hole 25 in the lower part of the side plate 13.
．． 20 and a part of the pressure spring 19 are fitted into the window hole 25, and the fixing plate 21, 21 is attached by tightening the bolts 26, . . . .

The pressurizing drive section 15 includes a motor 27 as a drive source and this motor 2.
It has an eccentric cam 28 which is rotated at 7. motor 27
is fixed to the base plate 12, and its rotational force is transmitted via a timing belt 29 to a pulley 30 fixed to the end of the eccentric cam 28, thereby rotating the eccentric cam 28. As shown in FIG. 3, the eccentric cam 28 has a pair of bearings 31.31 installed coaxially at both ends thereof, and a bearing 32.32 is installed inside these bearings 31.31 by an amount of eccentricity. It is installed. The eccentric cam 28 holds the bearing 32 in contact with the cap 24 of the corresponding pressurizing force adjustment means 14.
1.31 through a pair of base plates 12.
It is rotatably supported by 12. When the eccentric cam 28 is rotated by the motor 27, the bearing 32.32 rotates and moves the side plate 13.13 back and forth via the pressing force adjusting means 14.14. Note that the reference numeral 34 in FIG. 2 is a separation roller, and the microcapsule paper 3 and the color developing paper 4 are separated by this separation roller 34.

The pressure control unit 16 controls the drive and rotation angle of the motor 27 of the pressure drive unit 15 based on external control signals. For example, as shown in the block diagram of FIG. When a copy mode is set on the installed operation panel 33, a rotation control signal corresponding to the copy mode at that time is outputted from the pressing force control section 16, and the motor 27 is rotated as described later.

Next, the operation of the above embodiment will be explained.

First, the initial state is that the microcapsule paper 3 and the color developer paper 4 are not pressed by the large and small diameter work rollers 10 and 11, that is, the microcapsule paper 3 and the color developer paper are placed between the large and small diameter work rollers 10 and 11. In the initial state where there is a sufficient gap for the 4th to pass through without being pressurized, the 4th
The settings are as shown in the figure. That is, eccentric cam 2
8 is held at an initial position where the outer periphery of the bearing 32 located at the shortest distance from its center hits the cap 24 of the pressurizing force adjustment means 14, and at this time, the side plate 13.1
3 is rotated by its own weight around the shaft 17 in the direction of the arrow in FIG. 4, and stops at the position where the cap 24 hits the bearing 32. The contact between the cap 24 and the bearing 32 is always maintained stably under any conditions due to the weight of the unit including the side plates 13.13.

When the copying mode of the copying machine is set using the external operation panel 33, the information is sent to the pressurizing force control section 16, and the pressurizing force controlling section 16 adjusts the pressure corresponding to the developing speed obtained from the input information. The motor 27 of the pressurizing drive unit 15 is rotated by a predetermined rotation angle using the drive control signal. As a result, the eccentric cam 28 rotates and the bearing 32 rotates, and this rotation presses the cap 24 of the pressing force adjustment means 14.
The entire side plate 13.13 moves in the direction of the arrow in FIG. 2 with the shaft 17 as a fulcrum, and the small-diameter work roller 11 moves in the direction of the large-diameter work roller 10. The microcapsule paper 3 and the developer paper 4 are pressed by large and small diameter work rollers 10.11. This pressurizing force corresponds to the pressure development speed, that is, the pressurizing force is controlled so that when the pressure developing speed is slow, the pressurizing force is lower than usual, and conversely, when the pressure developing speed is fast, the pressurizing force is increased. Further, adjustment of the pressing force at a predetermined pressure development speed is achieved by adjusting the stroke length of the cap 24 using the pressing force adjusting means 14.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and that various changes can be made, particularly to the mechanisms of the pressure adjustment means and pressurization drive section.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, the photosensitive pressure sensitive paper and the color developing paper that pass between the first and second rotating bodies are The pressure applied to the pressure-sensitive paper and color developer paper can be variably controlled by the pressure-sensitive pressure control unit. Therefore, if the exposure or pressure development speed becomes slower than normal, the pressure is reduced and the photosensitive pressure-sensitive paper is pressed with an appropriate force. This increases the quality of the output image, such as sharpening the white area of the output image.
An excellent effect can be expected in stabilizing image quality in various copying modes, and has the effect of increasing the commercial value of the copying machine.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the pressure developing device of the present invention;
Figure 2 is a sectional view taken along the line A-A in Figure 1, Figure 3 is a front view of the parts of the pressure drive unit in the pressure developing device shown in Figure 1, and Figure 4 is taken along the line A-A in Figure 1. 5 is a sectional view taken along the line B-B in FIG. 2, and FIG.
FIG. 2 is a block diagram showing the electrical circuit configuration of the pressure developing device shown in the figure. FIG. 7 is a side view schematically showing a conventional pressure developing device. 3...Microcapsule paper (light and pressure sensitive paper), 4...
... Color developer paper, 10... Large diameter work roller (first rotating body), 11... Small diameter work roller (second rotating body), 12... Base plate (fixing member), 13・
. . . Side plate (swinging member), 14 . . . Pressure force adjustment means 15 . Figure 4

Claims (1)

[Scope of Claims] A fixed member that rotatably supports a first rotating body in a fixed position of a pair of rotating bodies that pressurizes and develops a photosensitive pressure-sensitive paper and a color developer paper; and a fixed member that rotates a second rotating body. a swinging member that is arranged to be movable back and forth in a fixed direction in which a second rotating member approaches and moves away from the first rotating member; a pressure drive section that appropriately presses and moves the first rotor in a direction in which the second rotor is pressed through a pressure adjustment means; a movement amount of the swinging member by the pressure drive section; A pressure developing device comprising: a pressurizing force control section that performs variable control in accordance with the moving speed of the photosensitive and pressure sensitive paper passing between the first rotary body and the second rotary body.