JPH043158A - 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 [Field of Industrial Application] The present invention relates to a pressure developing device in a copying machine or a printer using pressure-sensitive recording paper (for example, microcapsule paper and color developer paper). The present invention relates to a pressure developing device equipped with a backup roller of this type.

[Prior Art] Conventionally, a pressure developing device equipped with a skew-type backup roller has been put into practical use. As shown in FIG. 3, this type of device includes two pressure rollers 2i that are close to each other in parallel;
By passing the microcapsule paper A and the color developer paper B overlappingly between 22, the two pressure rollers 21 and 22 press the microcapsule paper A and the color developer paper B linearly in the width direction, and convert the image information into image information. The latent image formed on microcapsule paper A is developed on developer paper B, and one of the two pressure rollers 21 and 22 is a large-diameter work roller 21.
The other is a small-diameter work roller 22, and the small-diameter work roller 22 is provided with a skewed backup roller 23. The backup roller 23 has a plurality of pressure means (not shown) such as pressure springs along its axial direction.
The microcapsule paper A and the color developer paper B were pressed against the large-diameter work roller 21 by their pressure horns. Therefore, even if the backup roller 23 is skewed, there is no need to vary the loads (pressure forces) of the plurality of pressure means, so the position is limited to the mounting position of the rotary drive device for opening and closing between the work rolls 21 and 22. There was no.

The surface of the microcapsule paper A is coated with microcapsules containing a dye precursor that reacts with a color developer described below, while the surface of the color developer paper B is coated with the dye precursor. A color developer is applied that reacts with the color to form an image, and when the microcapsule-coated surface of microcapsule paper A and the color developer-coated surface of color developer paper B are brought into contact and pressurized, the applied force causes Only the unexposed microcapsules of the microcapsule paper A are destroyed, and the dye precursors contained therein are exposed, and this reacts with the color developer of the color developer paper H to form a color, thereby forming an image.

After this development is completed, microcapsule paper A and color developer paper B are separated by a separation roller 24, microcapsule paper A is wound up on a winding shaft 25, and color developer paper B is sent to a heat fixing device 26.

``Problems to be Solved by the Invention'' However, there is a pressure developing device equipped with a skewed one-type backup roller of the structure previously filed by the present applicant, that is, as shown in FIGS. 1 and 2, and the structure will be described later. In a pressure developing device, the backup roller has a certain intersection angle with one of the pressure rollers, so the distance from the center of rotation of the nip opening/closing between the pair of pressure rollers to the center of the end face of the backup roller, Left and right when viewed from the side? Because of this difference, the appropriate pressure distribution required for development cannot be obtained unless the pressure force (pressure spring) of the pressure means on the side far from the center of rotation is set to a higher load than on the opposite side. Therefore, when a high-load pressure means is provided on the side far from the center of rotation, the rotary drive device for opening and closing between the pressure rollers should be installed on the side of the pressure means with a lower set load of the eccentric camshaft. When installed, there are problems such as threads appearing on the eccentric cam shaft, time differences occurring between the left and right sides of the pressure roller when opening and closing between the pressure rollers, and adjustment of the pressure force of the pressure means becoming complicated. There was.

The present invention has been made to solve the above-mentioned problems, and is a pressure developing device that includes a skewed one-type backup roller and a plurality of pressurizing means with different pressurizing forces, and controls the pressurizing force with an eccentric camshaft. It is an object of the present invention to provide a pressure developing device that can minimize twisting occurring in an eccentric camshaft, easily adjust the pressing force of a pressing means, and form excellent images.

[Means for Solving the Problems] In order to solve the above-mentioned objects, the pressure developing device of the present invention provides: a) a pressure developing device that develops pressure-sensitive recording paper by applying pressure between a pair of pressure rollers; ) A second pressure roller is attached to the fixed member equipped with the first pressure roller, and a swinging member equipped with a second pressure roller and a backup roller crossing the second pressure roller. The roller is connected via a pivot shaft so that it rotates in a fixed direction approaching and separating from the first pressure roller, and C) the distance from the pivot shaft to the support portion of the backup roller is determined by the distance between the second pressure roller and the second pressure roller. The fixing member is provided with a plurality of pressurizing means in which the farthest pressurizing means is set to have a higher load than the nearer pressurizing means when viewed from the longitudinal direction of the roller, and a plurality of pressurizing means that abuts on these pressurizing means are provided. An eccentric cam shaft serving as a pressure control section is provided on the swinging member, and d) a rotation drive device is connected to the pressure means side of the eccentric cam shaft set to a high load.

[Function] According to the pressure developing device of the present invention having the above configuration,
Since the backup roller is skewed by a certain intersection angle with respect to the second pressure roller, the distance from the support portion of the backup roller to the pivot shaft differs between the left and right sides. Therefore, in order to obtain a symmetrical pressure distribution between the pressure rollers, the load setting of the pressure means with the longer distance (further) between the support part and the pivot shaft should be set higher than that of the other pressure means. If it is set as such, the rotary drive device is connected to the higher set load of the eccentric camshaft pressurizing means, so twisting of the eccentric camshaft can be minimized and , there is no difference in pressurization timing between the left and right sides.

[Example] The configuration of a pressure developing device according to an example of the present invention will be described with reference to FIGS. 1 and 2.

The pressure developing device is bilaterally symmetrical, and as shown in FIG. A large-diameter work roller l serving as one pressure roller and an eccentric camshaft 2 serving as a pressure force control unit are each rotatably supported at both ends via bearings (not shown).

On the other hand, inside the base plate 3.3, a pair of side plates 7.7 as swinging members are arranged parallel to each other at a constant interval, and each side plate 7 is connected to the base plate 3 by a pivot shaft 6. Rotatably connected. A small-diameter work roller 4 as a second pressure roller and a backup roller 5 are rotatably supported at both ends between the side plates 7 and 7 via bearings (not shown) as supporting parts. . In FIG. 1, the backup roller 5 has its left side skewed toward the small diameter work roller 4, and therefore,
A pressurizing spring 10- of the left side (FIG. 1) pressurizing means 8, which will be described later.
The pressing force of L is set higher than that of the pressing spring 10-R of the pressing means 8 on the right side.

Further, as shown in FIG. 2, pressure means 8 for the large-diameter work roller 1 and the small-diameter work roller 4 are attached to the side plate 7. This pressurizing means 8 includes a pressurizing spring 1
0, blocks 9a and 9b, a cap 11, a pair of fixing plates 16, nuts 12a and 12b, and a pressure bolt 13, and is fixed on the side plate 7 with a mounting bolt 14 at a predetermined interval. block 9a within plate 16;
The pressure spring 10 is sandwiched between the pressure springs 9b and 9b, and the pressure spring 10 is
It is held in a shortened state to an appropriate length by a nut 12a. In addition, the cap II is tapped, and the stroke ML is different from the cap 11 and the nut 12.
b is set to an appropriate length. Furthermore, the block 9a.

9b, the pressure spring 10, and the nuts 12a, 12b are inserted into the notch 17 of the side door and fixed there.

A link-shaped bearing body 2a is press-fitted around the eccentric cam shaft 2, and a pressure means 8 is attached to this hair ring body 2a.
The tip of the cap 11 is brought into contact with the tip of the cap 11. In FIG. 1, on the left end of the eccentric camshaft 2, in other words, on the side where the pressure of the pressure means 8 (pressure spring IO) is increased,
A drive motor 15 as a rotational drive device is a reduction gear device 1
5a. In addition, the code 1 in Figure 2
8 is a separation roller.

Next, the operation of the pressure developing device of the above embodiment will be explained.

First, in a state where no pressure is applied (this is set as the initial state), that is, the long microcapsule paper A and the color developer paper B are overlapped and passed between the large-diameter work roller l and the small-diameter work roller 4. In order to create a state where there is sufficient clearance, the contact point with the cap 11 should be the point where the distance from the axis of the eccentric camshaft 2 to the outer periphery of the bearing body 2a is the minimum (in the state shown in Fig. 2). From eccentric camshaft 2,
By rotating the eccentric camshaft 2 by the drive motor 15 so that the eccentric camshaft 2 is rotated approximately 180 degrees, the side plate 7.7 is rotated about the pivot shaft 6 with respect to the base plate 3.3 due to the weight of the pressurizing means 8, etc. and rotate. As a result, a gap is created between the large-diameter work roller 1 and the small-diameter work roller 4. In addition, not only in the pressurized state described below but also in this initial state, the cap 11 is in contact with the bearing body 2a on the eccentric camshaft 2 due to the weight of the pressurizing means 8 and the like.

On the other hand, in the pressurized state, that is, when microcapsule paper A and color developer paper B are brought into pressure contact between work rollers 1 and 4, the required pressure differs depending on the size of color developer paper B used, so You have to apply pressure. Therefore, when the eccentric camshaft 2 is rotated from the initial state, the contact point between the cap 11 and the bearing body 2a moves in the direction of arrow C (FIG. 2), and a force is exerted in the direction of compressing the pressure spring 10. Therefore, the angle at which the eccentric camshaft 2 is rotated from the initial state is set by the drive motor 15.
By controlling the pressure means 8, the pressure applied by the pressure means 8 can be adjusted as desired, and the pressure can be set to a pressure suitable for developing paper B of various sizes. Note that FIG. 2 shows a state in which the eccentric camshaft 2 has rotated to a position where the pressing force generated by the pressure means 8 is approximately at its maximum.

By the way, the backup roller 5 is skewed by a certain intersection angle with respect to the small-diameter work roller 4, that is, the first
In the figure, the left end is offset toward the manual hitting side. Therefore, the distance from the support portion of the backup roller 5 to the pivot shaft 6 is longer on the left side than on the right side. Therefore, in order to obtain a symmetrical pressure distribution between the work rollers 1.2, the load setting of the left pressure spring 10-L was changed to that of the right pressure spring 10-L.
-It is higher than R.

Under the above spring conditions, - the eccentric cam shaft 2
When transmitting the power from the drive motor 15 to the left and right pressure springs 10-S and 10-R at the same time, suppose that the drive motor I5
When connected to the right side of the eccentric camshaft 2 (lower spring load side), due to the resistance due to the strong spring force of the pressure spring 10-L on the left side, twisting occurs on the left and right sides of the eccentric camshaft 2, causing the pressure to increase. There will be a difference in timing between the left and right sides. However, in the present invention, since the drive motor 15 is connected to the left side of the eccentric cam shaft 2, the eccentric cam shaft 2
Twisting and differences in left and right pressurization timing are unlikely to occur.

[Effects of the Invention] As is clear from the detailed description above, according to the pressure developing device of the present invention, the rotary drive device for opening and closing between the pressure rollers is controlled by the setting load of the pressure means of the eccentric camshaft. Since it is connected to the higher side, the eccentric cam shaft is less likely to be twisted, the pressing force of the pressing means can be easily adjusted, and high-quality images can be formed.

[Brief explanation of drawings]

1 to 3 show embodiments embodying the present invention. FIG. 1 is a front view of the pressure developing device, and FIG. 2 is a sectional view taken along the line II-II of FIG. 1. be. FIG. 3 is a side view showing an outline of a conventional general pressure developing device. l... Large diameter work roller (pressure roller), 2 - Eccentric cam soyaft (pressure force control unit), 3... Heath plate (fixing member), 4... Small diameter work roller (pressure roller), 5... Backup roller, 6/pivot shaft, 7...
Side plate (swinging member), 8...pressure means, 10...
・Pressure spring, 15... drive motor (rotary drive device),
A: Microcapsule paper, B: Developing paper. Figure 3

Claims (1)

[Scope of Claims] In a pressure developing device that develops pressure-sensitive recording paper by applying pressure between a pair of pressure rollers, a second pressure roller is attached to a fixed member provided with the first pressure roller. and a swinging member provided with a backup roller that intersects with the second pressure roller. The distance from the pivot shaft to the support portion of the backup roller is such that the pressure means that is farther from the second pressure roller when viewed from the longitudinal direction is subjected to a higher load than the pressure means that is closer. A set plurality of pressurizing means are provided on the fixed member, and an eccentric camshaft as a pressurizing force control unit that comes into contact with the pressurizing means is provided on the swinging member, and the eccentric camshaft is set to a high load. A pressure developing device characterized in that a rotary drive device is connected to the pressure applying means side.