JPS6181353A - Curing device for curl propensity - Google Patents

Abstract

PURPOSE:To enhance performance of recording paper to be transported and enable the device to be miniaturized by guiding paper sheet by means of a lower guide plate while utilizing proper propensity of paper itself and its weight and arranging the lower guide plate and the decurling roller of a curl propensity curing unit on the side where curl propensity of paper dominates. CONSTITUTION:A paper sheet moved to the left in A direction while passing through between an upper guide plate 1 and a lower guide plate 2, and is fed in furthermore by means of a device roller 12 and press feed roller 13 on inlet side. Then, since the curl propensity of paper faces downward, the tip of the paper sheet advances along the lower guide plate 2. R part formed by about 130 deg. bending turn is provided on the tip of the lower guide plate 2, and a paper sheet advancing along the lower guide plate 2 is sooner or later bent at the R portion in opposite direction to its original propensity, and further sent out in B direction, being clamped between the drive roller 12 and the press, feed roller 14. The curl propensity is deleted at the R portion by being curled in reverse direction, but if the R portion is too large, the propensity is hardly eliminated and if it is too small, paper jam is liable to take place. Meanwhile, a decurling roller 3 is arranged to face the R portion so that it may sufficiently eliminate curl propensity of paper sheet by guiding the paper sheet along the R position.

Description

Detailed Description of the Invention ■ Technical Field The present invention is for correcting the curling of recording paper used in facsimile machines, rolled paper such as copy paper that tends to curl, and film. This invention relates to a curl correction device for curl correction.

■ Prior art As a conventional curl correction device, for example, the
18 Or Copy Paper Curl Removal Device”, Utsukai Showa 5l-90
957r roll paper curl correction device" is 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 of the strength cannot be made very small, and the curls cannot be removed sufficiently.

Figure 1 shows an example of the structure of the curl correction unit for recording paper (hereinafter referred to as paper) used in conventional facsimile machines. (not shown) is sequentially fed out by a roller or the like, and after the received signal is recorded by a thermal head or the like, it is cut into a predetermined length and is shown at the arrow mark in the figure.
It is fed into the curl correction section from the direction of.

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 a bracket, 7 is a support of the lower guide plate 2 and the bracket 6, 8 is a right guide plate, 9 is a left guide plate, 10 is a fulcrum of the left guide plate 9, and 11 is a stay.

The leading edge of the paper fed in from the direction of arrow A travels to the left between the upper guide plate 1 and the lower guide plate 2, and then passes through the first leaf spring 4.
It enters between the decurling roller 3 and the first leaf spring 4 along the . The peculiarity of the paper at this time is that the tip is facing downwards. This paper is pressed against the decurling roller 3 by the first leaf spring 4 and the second leaf spring 5, thereby removing 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 decurling, it can only be made as small as 7 to 8 m. Therefore, there is a phenomenon that the amount of habit removal is limited and if a strong habit is formed, it cannot be removed.

Reducing the diameter and providing a stopper roller on the opposite side is not very advantageous in terms of space, cost, and torque. In addition, 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, leading to jams, poor cutting due to loose paper, and paper feed. There is a problem in that tension is generated between the roller (recording paper main conveyance roller) and the decurling roller, which tends to deteriorate the feeding accuracy.

■Purpose The present invention is intended to solve the above-mentioned problems, and improves the conveyance performance of recording paper by utilizing the curl of roll paper etc. before the curl correction, and also reduces the size of the device. The present invention is intended to provide a curl correction device that achieves this goal.

■Structure Figure 2 shows the structure of the decurling part used in the present invention. 12 is a drive roller, 13 and 14 are Dango rollers on the entrance and exit sides, and 16 and 17 are Dango rollers. This is a leaf spring for applying a conveying force to 13 and 14, and the other symbols are the same as those shown in FIG.

The paper moves to the left between the upper guide plate 1 and the lower guide plate 2 from the direction of arrow A, and is further fed into the back by the drive roller 12 and the entrance side dump roller (feeding tension roller) 13. At this time, since the curl of the paper is directed downward, the leading edge of the paper advances along the lower guide plate 2. Lower guide plate 2
An R section with a rotation of approximately 130'' is provided at the tip of the paper, and the paper that has advanced along the lower guide plate 2 is eventually bent in the opposite direction at the R section, and is further bent by the drive roller 12 and the exit side Dango roller ( It is gripped by the feed-out tension roller 14 and sent out in the direction of arrow B.The R part reversely creates a kink to remove the kinks, but if the R is large, the kinks cannot be removed very well, and if the R is small, it may cause a jam. Also, there is a decurling roller 3 facing the R part, but without it, the paper would not follow the R part, and the paper would not follow the R part properly.
Because it is expelled, the habit cannot be removed sufficiently. Furthermore, the tension (feeding force) of the entrance-side bump roller 13 should be strong for removing the curls and transporting the bump-removal portion, while the exit-side bump roller 14 is only used for conveyance, so 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 around 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 the drive roller 12 is used as a 'dango' roller, and the upper guide plate 1 is extended and used in place of the decurling roller. Although this configuration has the advantage of being low-cost, it is better to use the decurling roller 3 shown in FIG. 2 than to use the upper guide plate 1 in terms of paper feeding load and protection of the recording surface. It's advantageous.

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. It is.

FIG. 5 shows another modification of FIG. 2, in which the feeding and feeding tension rollers are connected to the drive roller 12 using a gear.
The reliability of paper feeding is improved by rotating in synchronization with the paper. The gear 18 is fixed to the drive roller shaft 12', and the 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.

In the case of a normal 1-inch paper tube wound with 100 m of thermal paper, the outer diameter is about 95 mm, and the amount of residual curl at the beginning of the winding is 4 to 5 m. This amount of residual curl decreases with recording, but does not reach O.

The present invention aims at downsizing the curl correction section by guiding the paper with a lower guide using the inherent curl and gravity of the paper.

FIG. 7 is an explanatory diagram showing the conveyance state of paper, where 21 indicates a lower guide, 22 indicates paper, the leading edge of paper 22 is curled toward the winding side (downward), and the relationship of gravity is also added. , is conveyed in the direction of arrow A while contacting the lower guide 21. In this case, no upper guide is needed unless the curl becomes extremely large.

FIG. 8 shows the configuration of an embodiment of the present invention, in which 3 is a decurling roller, 12 is a drive roller, 21 is a lower guide, 22 is paper, 23 is a feeding tension roller,
A indicates the conveyance direction.

The paper advances in the direction of arrow A along the lower guide until it reaches the entrance of the correction section (in front of a pair of rollers). Here, a pair of rollers (drive roller 12 and tension roller 23) are tilted at an angle of 456.

9 and 10 show other embodiments of the present invention in which the pair of rollers are tilted at 90° and 135°, respectively,
All the symbols are the same as in FIG.

Comparing Figures 8, 9, and 10, the contact of the leading edge of the paper with the tension roller is due to the downward curl, so the case in Figure 8 is the smoothest, and the contact in Figure 10 is the smoothest. Since it deviates by nearly 90'' from the gripping angle shown in the figure, it is likely that the conveyance timing will shift, noise will be generated, and the tip will break.

The leading edge of the paper, whose conveying direction is changed by a pair of rollers, advances along a guide plate further below the conveying direction, and eventually,
As the back of the paper moves along the decurling roller 3, the curls are supposed to be corrected, but in Fig. 8,
A part of this decurling roller 3 is located below the paper conveyance direction.

This increases the winding angle of the paper around the decurling roller, and reduces the discharge angle (the difference in angle between the conveying direction before and after the decurling roller).

In Fig. 9, nine decurling rollers 3 and lower guides 21 are installed at the top and bottom of the conveyance direction, and in Fig. 10, the lower guide 21 comes out above the conveyance direction, contrary to Fig. 8. .

The transportation itself is more common in the case shown in Figure 10 (unrelated to #)
However, even in the case shown in Fig. 8, there is almost no difference (the difference in conveyance performance at a part of the decurling roller is small compared to the difference in conveyance performance at the entrance of a part of the tension roller), and the discharge angle is Figure 8 is the smallest.

Therefore, by arranging the paper as shown in FIG. 8, it is possible to improve the conveyance property by utilizing the curl of the paper, and at the same time, it is possible to make the paper compact and to make the conveyance direction almost straight. The fact that the conveyance direction can be almost straight except for the skew correction section means that in the case of Figures 9 and 10, it is necessary to change the conveyance direction to either side after the page is ejected, whereas in the case of Figure 8 In this case, the conveyance path is not complicated and complicated related parts are not used, so the conveyance performance (jam rate) is improved and the jam removal performance is also improved.

■Effects As explained above, the present invention utilizes the inherent curl of paper and gravity to guide the paper with the lower guide, thereby reducing the size of the curl correction unit and changing the conveyance direction from the curl correction unit. It has the advantage that it can be made almost straight, and it can be made smaller.

[Brief explanation of the drawing]

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. Second
4 is a diagram showing another modification of FIG. 2, FIG. 5 is a diagram showing another modification of FIG. 2, and FIG. 6 is a diagram showing the outside of the rolled recording paper. A characteristic diagram showing the relationship between the diameter (winding diameter) and the amount of curl, FIG. 7 is an explanatory diagram showing the conveyance state of paper, FIG. 8 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 9 and FIG. 10 are diagrams showing the configuration of another embodiment of the present invention. 1... Upper guide plate, 2... Lower guide plate, 3...
・Decurling roller, 4, 5 ... Leaf spring, 6
...bracket, 7,10...fulcrum, 8...
Right guide plate, 9...Left guide plate, 11...Stay, 12...Drive roller, 12'...Drive roller shaft, 13...Entrance side Dango roller, 13'
... Feed-in tension roller shaft, 14... Outlet side Dango roller, 14'... Delivery tension roller shaft, 15... Heald, 16, 17... Leaf spring, 18-20... Gear, 21...lower guide, 2
2...Paper, 23...Feeding tension roller. Patent applicant Rico Co., Ltd. Nippon Telegraph and Telephone Public Corporation Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A feeding section consisting of a lower guide plate that guides the fed paper, a feeding tension roller that feeds the fed paper further into the interior, a curl correction section provided close to the feeding section, and a feeding tension roller that drives the feeding section. The leading edge of the paper is conveyed along the lower guide plate with a curl in the direction of contact with the lower guide plate, and a lower guide plate is provided on the curl side of the paper with respect to the feeding direction. and a curl correction device comprising a decurling roller of the curl correction section.