JPH0233622B2 - MAKIHEKIKYOSEISOCHI - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention corrects the curling of recording paper used in facsimile machines, rolled paper such as copy paper that tends to curl, film, etc. The present invention relates to a curl correction device for

Prior art As a conventional curl correction device, for example,
−34180 “Copy paper curl removal device”, Utility Model 1977−
90957 ``Device for straightening roll paper'' and the like are well known.

All of these methods use rollers to correct curls, but while they are effective when using large rolls (2-inch to 5-inch paper cores), curls cannot be removed when using small rolls (1-inch paper cores). .
That is, since the decurling roller, which is a small-diameter roller, has opposing rollers, the diameter cannot be made too small in terms of strength, so the curls cannot be removed sufficiently.

Figure 1 shows an example of the configuration of the curl correction unit for recording paper (hereinafter referred to as paper) used in conventional facsimile machines. (Not shown.)
This is successively repeated by a roller or the like, and after the received signal is recorded by, for example, a thermal head, the paper is cut into a predetermined length and sent to the curl correction section from the direction of arrow A in the figure.

In the figure, 1 is the upper guide plate, 2 is the lower guide plate, 3 is the decurling roller, 4 is the first leaf spring, 5 is the second leaf spring, 6 is the bracket, and 7 is the lower guide plate 2.
and the fulcrum of the support of the bracket 6; 8, the right guide plate; 9, the left guide plate; 10, the fulcrum of the left guide plate 9; and 11, the stay.

The leading edge of the paper fed from the direction of arrow A travels to the left between the upper guide plate 1 and the lower guide plate 2,
a decurling roller 3 along the first leaf spring 4;
and the first leaf spring 4. The peculiarity of the paper at this time is that the tip points downward. This paper is pressed against the decurling roller 3 by the first leaf spring 4 and the second leaf spring 5 to remove its curls.

Here, the decurling roller 3 conveys the paper in the direction of arrow B by pressing the first and second leaf springs 4 and 5, and the paper is delivered to a stacker or the like via a paper discharge roller (not shown). In order to transport the paper stably, the decurling roller 3 must be a rubber roller, and considering the pressure and transport torque required for removing curls, the decurling roller 3 can only be made as small as φ7 to φ8 mm. Therefore, if the amount of habit removal is limited and a strong habit develops, there will be a phenomenon that it will not be possible to remove it. Reducing the diameter and providing a stopper roller on the opposite side is not very advantageous in terms of space, cost, and torque. Also, pressing the leaf spring strongly against the roller has some effect on removing curls, but it also makes it harder to grip the leading edge of the paper, resulting in jams, poor cutting due to loose paper, and paper feed. There is a problem in that tension is likely to occur between the roller (recording paper main conveyance roller) and the decurling roller, resulting in poor feeding accuracy.

Purpose The purpose of the present invention is to solve the above-mentioned problems and improve conveyance performance.

Configuration In order to achieve the above object, the present invention has a single drive roller that is in pressure contact with an infeed tension roller and a delivery tension roller and drives both tension rollers, and a drive roller that is connected to the delivery tension roller and the drive roller. The pressure contact force is made smaller than the pressure contact force between the feed tension roller and the drive roller.

Embodiment FIG. 2 shows the structure of the decurling section used in the present invention, in which 12 is a driving roller, 13 and 14 are a feeding tension roller and a feeding tension roller, and 16 and 17 are tension rollers 13. and 14, and the other symbols are the same as those shown in FIG.

The paper moves from the direction of arrow A to the left between the upper guide plate 1 and the lower guide plate 2, and is further fed into the back by the drive roller 12 and the feed tension roller 13. At this time, since the paper is bent downward, the leading edge of the paper advances along the lower guide plate 2. At the tip of the lower guide plate 2, there is provided an R part that rotates approximately 130 degrees, and the paper that has advanced along the lower guide plate 2 is eventually bent in the opposite direction at the R part, and is further transferred to the drive roller 12 and sent out. It is held in the tension roller 14 and sent out in the direction of arrow B. On the contrary, the curve is removed by the rounded portion, but if the curve is large, the curve cannot be removed very well, and if the curve is small, it tends to jam. Furthermore, a decurling roller 3 is provided opposite the R section, but without this, the paper would not follow the R section and would be ejected at an appropriate R, making it impossible to remove the curls sufficiently. Furthermore, the tension (feeding force) of the feeding tension roller 13
It is better to have a strong tension roller 14 for removing kinks and conveying the curvature-removal portion.On the other hand, since the sending tension roller 14 is used only for conveyance, a very strong tension is not required. Furthermore, if the feeding force of the main conveyance section upstream of the input side is not sufficiently stronger than that of the deformation entrance side, it will adversely affect the feeding accuracy. The decurling roller 3 is pivotally supported by a bracket 6 that holds the lower guide plate 2, and the bracket 6 rotates counterclockwise about a fulcrum 7 to facilitate jam removal. Similarly, the left guide plate 9 is also rotatable to the left about the fulcrum 10.

FIG. 3 shows a modification of FIG. 2, in which an extended upper guide plate 1 is used instead of the decurling roller. Although this configuration has the advantage of being low-cost, it is better to use the second guide plate than the upper guide plate 1.
Using the decurling roller 3 shown in the figure is more advantageous in terms of paper feeding load and protection of the recording surface.

FIG. 4 shows another modification of FIG. 2, in which the decurling roller 3 is rotated synchronously with the drive roller 12 using a belt (or a gear) 15 to improve the reliability of paper passing. .

FIG. 5 shows another modification of FIG. 2, in which the feeding and feeding tension rollers are rotated synchronously with the drive roller 12 using gears, thereby improving the reliability of paper feeding. Furthermore, gear 1
8 is fixed to the drive roller shaft 12', and gears 19 and 20 are fixed to the feed and feed tension roller shafts 13' and 14', respectively.

FIG. 6 is a characteristic diagram showing the relationship between the outer diameter (winding diameter) of a roll of recording paper and the amount of curl, and the amount of curl increases as the outer diameter of the roll paper becomes smaller.

Standard 1 inch (2.54 cm) paper tube
In the case of a 100m roll of thermal paper, the outer diameter is approximately 95
mmφ, the amount of residual curl at the beginning of winding is 4~
It is 5mm. This amount of residual curl decreases with recording, but does not become zero.

Effects As is clear from the above explanation, according to the present invention, the pressure force between the feed tension roller and the drive roller is made smaller than the pressure force between the feed tension roller and the drive roller, and the paper is It can be fed and sent out smoothly,
Moreover, a sufficient curl correction effect can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the configuration of a paper curl correction unit used in a conventional facsimile machine, FIG. 2 is a diagram showing the configuration of a decurling unit used in the present invention, and FIG. Figure 4 showing a modification of Figure 2.
The figure shows another embodiment of Fig. 2, and Fig. 5 shows the second embodiment.
FIG. 6, which is a diagram showing another modification of the diagram, is a characteristic diagram showing the relationship between the outer diameter (winding diameter) of a roll of recording paper and the amount of curl. 1... Upper guide plate, 2... Lower guide plate, 3...
Decaling roller, 4, 5...Plate spring, 6...
... Bracket, 7, 10 ... Fulcrum, 8 ... Right guide plate, 9 ... Left guide plate, 11 ... Stay, 12
... Drive roller, 12' ... Drive roller shaft,
13...Feed tension roller, 13'...
...Feeding tension roller shaft, 14...Feeding tension roller, 14'...Feeding tension roller shaft, 15...Belt, 16,1
7...Plate spring, 18-20...Gear, 21...
Lower guide, 22...Paper, 23...Feed tension roller.

Claims (1)

[Claims] 1. A lower guide section that guides the fed paper, a feeding section consisting of a feeding tension roller that feeds the fed paper further inside, a curl correction section provided close to the feeding section, and a curl correction section. It has a delivery tension roller that sends the paper discharged from the paper downstream, and a single drive roller that is in pressure contact with the delivery tension roller and the delivery tension roller and drives both tension rollers, and the delivery tension roller and the delivery tension roller are driven. A curl correction device characterized in that a pressure contact force with the roller is smaller than a pressure contact force between the feed tension roller and the drive roller.