JPH03130767A - Pressure developing device - Google Patents

Abstract

PURPOSE:To simplify the device, and also, to cancel a working error of parts by using deflection restoring force of a cam follower shaft as pressure force of a developing roller, and also, constituting the device so that a distribution of the pressure force can be adjusted. CONSTITUTION:Between a large diameter roller 21 and a small diameter roller 22 of this device, developing paper and microcapsule paper are superposed and fed in. In this case, cams 23a - 23c provided on a cam shaft 25, and bearings 26a - 26c on a cam follower shaft 27 are brought to press-contacting and the shaft 27 is brought to elastic deformation. Subsequently, its restoring force is transferred to the roller 22, and used for transferring an image to the developing paper. Also, by varying a position on a cam outline curve of each cam by rotating the shaft 25 by a desired angle, and varying a distance between its position and the axis center of the shaft 25, or varying a distance between the shafts 25, 27 by wedges 29a, 29b, a pressure distribution to the roller 22 is adjusted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image forming apparatus using a photosensitive pressure sensitive medium,
In particular, the present invention relates to a pressure developing device that develops and transfers images using pressure.

[Conventional technology]

Traditionally, color copying machines have used microcapsule paper, which is a photosensitive pressure-sensitive medium that carries microcapsules on its surface that contain dye precursors, photopolymerization initiators, etc. and whose mechanical strength changes in response to light, to pass the original through. The exposed microcapsule paper and an image recording medium (developer paper) with granular developer applied to the surface of a support such as plain paper using a developer applicator are sent to a pressure developing device. The microcapsules, whose mechanical strength has been reduced by the exposure, are destroyed by pressure and the dye precursor inside them flows out, and the dye precursor that flows out reacts with a color developer to develop the color. A type of image forming apparatus is known in which an image is transferred onto developer paper, and the developer paper after pressure development is sent to a heat fixing device to fix the color image on the developer paper.

The pressure developing device as described above has two components that are in contact with each other,
Generally, the roller is provided with a plurality of rollers that are rotatably provided around respective rotational axes, and each of the rotational axes is parallel to each other. Various types of means for applying pressure to these rollers are known.

One of them is a type in which pressure is applied using a large diameter roller with high rigidity, and Japanese Patent Application Laid-Open No. 63-262650 is a known document of a pressure developing device having such a structure.

In addition, as another type, there is one in which a small diameter roller with low rigidity is supported at multiple points on a large diameter roller with high rigidity and pressurized, and known documents of a pressure developing device having such a configuration include: U.S. Patent No. 4,104.963 (
August, 8, +978).

In a pressure developing device, if there is unevenness in the pressure distribution in the direction of the rotational axis of the roller, wrinkles will occur on the paper or uneven development will occur. Therefore, in the above-mentioned former known example, the shape of the pressure roller is made to have a curvature in the direction of the rotation axis, or the rotation axes of the pressure roller and the roller to be pressed are not parallel to each other, so that their intersection angle is We are making some adjustments. In the latter known example, the pressure at a plurality of pressurizing points is adjusted by coil springs.

[Problem to be solved by the invention]

However, in any of the above-mentioned conventional methods for adjusting pressure distribution in a pressure developing device, the processed shapes of the parts are complicated, the number of component parts is large, and processing costs and assembly costs are high. Furthermore, since the number of component parts is large, the failure rate is also high. Furthermore, due to manufacturing and processing errors in the parts, the required operating functions may not be fully achieved.

The present invention has been made to solve the above-mentioned problems, and has a simpler structure with fewer parts than the conventional one, while being able to adjust pressure distribution and canceling manufacturing and processing errors of parts. The purpose of the present invention is to provide a pressure developing device that is possible.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a first roller that is rotatably provided around a rotating shaft, and a first roller that is installed so as to be able to approach and separate from the first roller, and that is parallel to the rotating shaft of the first roller. A second rotary shaft rotatably provided around a rotating shaft
A roller, a cam holding means movable in a direction toward and away from the second roller, a plurality of cams installed on the cam holding means, and a plurality of cams that are brought into pressure contact with the cam to cause elastic deformation in the cam. a pressure generating means for applying pressure; and a pressure generating means installed on the cam holding means and transmitting the pressure generated by the pressure generating means and transmitted to the cam holding means via the cam to the second roller. , comprising a distance adjusting means that can adjust the distance between the cam and the pressure generating means.

[Effect]

According to the present invention having the above configuration, the cam (23a) is provided on the circumferential surface of the camshaft (25).

23b, 23C) and bearings (26a, 26b, 26C) on the circumferential surface of the cam follower shaft (27), the cam follower shaft (27) is bent and elastically deformed. At this time, each bearing (26a
, 26b, 26c), a force that attempts to restore the cam follower shaft (27) to its original state is applied as a reaction force to the bearing (26a).

26 b, 26 c) to the cam (23a, 23 b
.

23c), and this elastic restoring force is transmitted to the small diameter roller (22) by the bearings (24a, 24b, 24C124d) and becomes a roller pressing force.

In addition, the pressure distribution of the pressing force on the roller is determined by the camshaft (25)
Rotate the bearing (26a, 2
The cams (23a, 23
By changing the position on the cam contour curve of b, 23 c), the position on the cam contour curve and the camshaft (2
5) can be adjusted depending on the distance between the shaft center and the wedge (29a).

29b) to connect the camshaft (25) and cam follower shaft (27).
), i.e. the distance between the cam (23a.

23 b, 23 c) and bearings (26a, 26
b.

26c) can also be arbitrarily adjusted by changing the distance between the two.

Therefore, the large diameter roller (2
1) and the small diameter roller (22) are rotated, the elastic restoring force of the cam follower shaft (27) is applied to the small diameter roller (22) and the bearing (24a) is rotated.

24 b, 24 c, 24 d), a predetermined pressure distribution state is maintained between the large diameter roller (21) and the small diameter roller (22).
By passing microcapsule paper, which is a photosensitive pressure-sensitive medium, and color developing paper, which is an image recording medium, overlapping and pressing each other between a large-diameter roller (21) and a small-diameter roller (22), problems such as paper wrinkles and uneven development can be solved. Pressure development can be performed without causing

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a color image forming apparatus M equipped with an embodiment of the pressure developing device according to the present invention. This color image forming apparatus M has an exposure device 1, which exposes a microcapsule paper 7, which is a photosensitive pressure-sensitive medium, running between a paper feed roll 5 and a take-up roll 6, through an original 10. A pressure developing device 2 is provided approximately at the center of a casing C of the color image recording device M, and a color developer applying device 3 is provided near the pressure developing device 2.

In this pressure developing device 2, the microcapsule paper 7 exposed by the exposure device 1 and the color developer paper P, which is an image recording medium and whose surface is coated with a color developer by the color developer coating device 3, are closely overlapped. As a result, the color image developed on the microcapsule paper 7 is transferred to the color developer paper P.
transferred on top. The color developing paper P after pressure development is
The image is sent to a heat fixing device 4, where the color image is fixed.

The exposure device 1 has a halogen lamp 8, and a rotating color separation filter 9 for the three primary colors is provided below the halogen lamp 8. Below the color separation filter 9,
A document 10 is placed on a document table 11. Guide rollers 12a and 12b are provided on the left and right sides of this document table 11, and the microcapsule paper 7 exposed below the exposure device 1 is further pressure developed via guide rollers 12c and 12d provided downstream. It is sent into the device 2.

Color developer paper P coated with a color developer by the color developer coating device 3
is sent to the pressure developing device 2 by the guide roller 13 in a superimposed state with the microcapsule paper 7, and is pressurized to perform a pressure development action and a color image transfer action to the color developing paper P.

The microcapsule paper 7 that has passed through the pressure developing device 2 is wound up by a winding roll 6. On the other hand, pressure developing device 2
The developer paper P that has passed through is sent to the heat fixing device 4 via a guide roller 14, where an image fixing action is performed, and then discharged to the outside via a guide roller 15.

Next, the structure of an embodiment of the pressure developing device according to the present invention will be explained with reference to FIGS. 2, 3, and 4.

This pressure developing device, like a normal pressure developing device, includes a large-diameter roller 21, which is a first roller fixed to a frame 20 and rotatably provided around a rotating shaft;
A small diameter roller 22 is provided as a second roller, which is installed to be able to move toward and away from the roller 1 and to be rotatable around a rotation axis parallel to the rotation axis of the large diameter roller 21. In addition to this, there is also a cam shaft 25, which is a cam holding means, which is movable toward and away from the small-diameter roller 22 and rotatable around the rotating shaft, and a cam shaft 25, which is supported by the frame 20 and is movable toward and away from the cam shaft 25. A cam follower shaft 27 is provided. Further, on the circumferential surface of this camshaft 25, cams 23 a,
23 b, 23 c, and bearings 24 a, 24 b, which are pressure generating means for transmitting pressure to the small diameter roller 22.
24c and 24d are installed. Cam 23a, 2
3b and 23c, the cams 23a and 23c have the same phase in the camshaft rotational direction, and the cams 23a and 23b have a 180° phase difference in the camshaft rotational direction. on the other hand,
On the circumferential surface of this cam follower shaft 27, a cam 23 a
, 23b, 23c, bearing 26a,
26b and 26c are installed. Here, the camshaft 25
is rotatable, and by rotating the camshaft 25,
Only the cams 23a and 2301 or the cam 23b can be selectively brought into pressure contact with the bearings 26a126b, 26C. Further, as a component, wedges 29a and 2 are provided near the portion of the frame 20 that supports the cam follower shaft 27, and are distance adjusting means capable of adjusting the distance between the cam shaft 25 and the cam follower shaft 27.
9b, and guide shafts 28a and 28b that support the frame 20.
A pressure developing device, which is an embodiment of the present invention, is comprised of these components. Here, the cam follower shaft 27 and the bearings 26a126b, 26c form a pressure generating means that generates pressure to be applied to the small diameter roller 22 using restoring force due to elastic deformation.

Next, FIG. 5 shows a perspective view of the structure of the wedge 29a. The structure of wedge 29b is similar to wedge 29a.

The wedges 29a and 29b are cut out from the sloped member and the vertical member supporting it, and the sloped member abuts the sloped lower surface of the cam follower shaft 27. The wedges 29a, 29b are placed so as to straddle the elongated hole 30 provided in the frame 20, and are placed in the elongated direction (
A-B direction). Also, this wedge 29
A long hole 31 is provided in the vertical member on the outside of a129b, and a protrusion 32 is provided at a position on the outside of the frame 20 corresponding to the center of this long hole 31, and a wedge 29a,
29b is fitted into this protrusion in the elongated hole 31. Therefore, the wedges 29a and 29b can be moved until both ends of the elongated hole 31 reach the position of the protrusion 32. A male thread is cut at the tip of the protrusion 32,
A tightening screw 33 having an internal female thread is screwed into this threaded portion. Therefore, by tightening this tightening screw 33, the wedge 29a129b can be fixed at that position.

Next, the operation of one embodiment of the pressure developing device according to the present invention will be described.

First, a developer paper and a microcapsule paper are fed in a stacked state between the large-diameter roller 21 and the small-diameter roller 22 and brought into pressure contact. Here, if the size of the color developer paper is A size, by rotating the cam shaft 25, the cams 23a, 2
3c is selected and used, and in the case of B version, only 23b is selected and used. This is to change the pressure distribution in the axial direction of the roller according to the width size of the paper. These cams and a bearing 26a12 on the circumferential surface of the cam follower shaft 27
6b and 26c are pressed against each other, the cam follower shaft 27 is bent and elastically deformed. At this time, in accordance with the amount of deflection (elastic deformation) of the cam follower shaft 27 at the position of each bearing 26 a % 26 b s 26 c, a force that attempts to restore this deflection to its original state is applied as a reaction force to the bearings 26 a, 26b.

26c is constantly applied to the cams 23a, 23b, and 23c, and this serves as a pressing force to the small diameter roller 22.

In this case, if the wedges 29a and 29b are moved in the longitudinal direction (A-B direction) of the frame elongated hole 30, either together or individually, manually or by a drive device (not shown),
The cam follower shaft 27 moves toward and away from the camshaft 25 (C-
D direction), so by tightening and fixing the tightening screw 33 at that position, the cams 23 a, 23
b, 23c and bearings 26a, 2
The distance to each of 6 b and 26 c can be changed. Therefore, when the cams 23a, 23b, and 23c are moved closer to the camshaft than the pressure contact points between the bearings 26a, 26b, and 26c, the cam follower shaft 27 is elastically restored according to the amount of deflection (elastic deformation). The force also changes, and as a result, the pressure applied to the small diameter roller 22 can be adjusted. This makes it possible to cancel manufacturing and machining errors of the cam, and also allows the pressure distribution in the axial direction of the pressure force applied to the small diameter roller 22 to be freely controlled by the combination of the rotational position of the camshaft 25 and the set positions of the wedges 29a and 29b. It will be possible to adjust to.

The cam shaft, cam follower shaft, cam in the above embodiment,
The number, shape, and configuration of bearings are not limited to those shown in the examples, but other numbers, shapes, and configurations are within the scope of the present invention. That is, the elastic restoring force of the cam follower shaft bent by a cam etc. is used as the pressing force of the roller of the pressure developing device,
And the pressure distribution of the roller pressing force is determined by the bearings 26a, 26.
b.

cam 23a123b at a position where it is in pressure contact with 26c;
Any mode may be used as long as it can be adjusted depending on the distance between the contour curve 23c and the camshaft axis. Therefore, the camshaft does not need to be parallel to the small diameter roller serving as the second roller, and may have a crank shape, for example.

Furthermore, hair ring 24 a% 24 bs 24 c
.

Since the camshaft 24d transmits the roller pressing force without rotating, the camshaft 25 needs to be rotatable in order to select cams with different phases, but the cam follower shaft 2
7 does not need to rotate. Therefore, the cam follower shaft 27 may have a leaf spring shape. In that case, the bearings 26a, 26b, 26c are not necessary, and may be protruding ones capable of supporting the single cams 23a, 23b, 23c.

Furthermore, from the above, generally the cams 23a, 23
b, 23ci: The abutting part 2. It is sufficient to install an object or device that elastically deforms when a compressive force is applied and generates a reaction force corresponding to the amount of deformation. Therefore, the cam follower shaft 27 and bearings 26a, 26b, 26c (
Instead of D, cam 23. a, 23b, 23c I: Contact through position 2, for example, a coil spring may be installed.

In the above-mentioned embodiment, the diameter of the roller that brings the photosensitive pressure-sensitive medium and the image recording medium into direct contact with each other is a combination in which the first roller has a large diameter and the second roller has a small diameter. This is also not limited to the combinations of the above embodiments, and other combinations are also within the scope of the present invention.

Furthermore, in the above embodiment, the cam 23a123b
, 23c and the cam follower shaft 27 and the bearings 26a, 26b, 26c, which are pressure generating means, as a distance adjusting means using wedges 29a, 29b having a configuration as shown in FIG. 5. , this wedge may be of other configurations. Further, the distance adjusting means may be of a structure other than a wedge.

For example, the cam follower shaft 27 which is the pressure generating means is connected to the cam 2.
3a, 23b, 23c and adjustment screws movable in the direction of the camshaft 25.

[Effects of the Invention] As explained above, according to the present invention, the deflection restoring force of the cam follower shaft is used as the pressing force of the roller of the pressure developing device, and the pressure distribution adjustment of the roller pressing force is also carried out by contacting the bearing. Since the position can be adjusted freely depending on the distance between the contour curve of the cam and the axis of the cam shaft and the wedge, the configuration of the pressure developing device can be made simpler than before.

Therefore, the number of component parts can be reduced, and the device can be made smaller and lighter. This not only reduces manufacturing costs such as processing and assembly, but also reduces the number of component parts.
This has the effect of keeping the failure rate low.

Further, since machining errors in the cam manufacturing stage can be canceled by adjusting the wedge, there is also an advantage that the reliability of the pressure developing device as a whole can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a color image forming apparatus to which the pressure developing device of the present invention is applied, FIG. 2 is a main sectional view showing an embodiment of the pressure developing device of the present invention, and FIG. 3 is a pressure developing device of the present invention. FIG. 2 is a sectional view taken along the direction m-m showing an embodiment of the developing device; FIG. 4 is a side view taken along the direction IV-rV of FIG. 2 showing an embodiment of the pressure developing device of the present invention; FIG. FIG. 3 is a perspective view of a wedge in an embodiment of the pressure development position of the present invention. ■... Exposure device 2... Pressure development device 3... Color developer coating device 4... Heat fixing device 5... Paper feed roll 6... Winding roll 7... Microcapsule paper 8 ...Halogen lamp 9...Color separation filter 10...Original 1■...Document table 12a-L2d...Guide roller 13...Guide roller 14.15...Guide roller 20 ...Frame 21...Large diameter roller 22...Small diameter roller 23a to 23c...Cam 24a to 24d...Bearing 25...Cam shaft 26a to 26c...Bearing 27...Cam follower shaft 28a , 28b... Guide shafts 29a, 29b - Wedge 30... Long hole in frame 31... Long hole in wedge 32... Protrusion 33... Tightening screw C, casing M... Color image forming device P・・・Developer paper

Claims (1)

[Claims] a first roller rotatably provided around a rotating shaft;
a second roller that is installed to be able to move toward and away from the first roller and to be able to rotate around a rotational axis that is parallel to the rotational axis of the first roller; and a second roller that moves in a direction that moves toward and away from the second roller. a plurality of cams installed on the cam holding means; a pressure generating means that generates elastic deformation and applies pressure to the cams by being in pressure contact with the cam; and a pressure generating means installed on the cam holding means. and a pressure transmitting means for transmitting the pressure generated by the pressure generating means and transmitted to the cam holding means via the cam to the second roller, and a distance between the cam and the pressure generating means. An adjustable distance adjusting means is provided, and an image is developed and transferred by passing a photosensitive pressure-sensitive medium and an image recording medium between the first roller and the second roller while overlapping and pressing them. A pressure developing device.