JPH0126982B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is for correcting the curling of rolled paper such as recording paper used in facsimile machines and copy paper that tends to curl. This invention relates to a curl correction device for curl correction.

(Prior art) As a conventional curl correction device, for example,
-No. 34180 "Decurling device for copy paper", Utility Model 51
No. 90957, ``Apparatus for straightening the curl of roll paper,'' etc. are known.

All of these methods use rollers to correct curls, but large rolls (2 inches to
It is effective when using a 5-inch paper core), but the problem cannot be removed with a small roll (1-inch paper core). 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.

Furthermore, there is also Japanese Patent Application Laid-Open No. 57-9662 entitled ``Recording Paper Curl Removal Device.'' This handles the paper by reversing its curl. Therefore, the upstream of the handling member,
A feed roller is provided on each downstream side, so that the circumferential speed of the downstream feed roller is faster than the circumferential speed of the upstream feed roller, and the frictional force of the downstream feed roller against the paper is lower than the frictional force of the upstream feed roller against the paper. It is necessary to reduce the size of the device, and the structure of the device becomes unavoidably complicated.

FIG. 1 shows an example of a relatively simple structure of the curl correction section of recording paper (hereinafter referred to as paper) used in other conventional facsimile devices. A roll of paper (not shown) is sequentially fed out by a roller or the like, and the received signal is recorded by, for example, a thermal head, and then cut into a predetermined length and marked by arrow A 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 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 paper with the first and second leaf springs 4 and 5, and sends the paper 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, there is a phenomenon that the amount of habit removal is limited and if a strong habit is formed, it cannot be removed. It is not very advantageous to reduce the diameter and provide a counter roller on the opposite side 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.

(Objective of the Invention) The present invention is intended to solve the above-mentioned problems with a relatively simple configuration.The radius of the decurling portion is made small, and the paper can be turned around parts with a small diameter. The object of the present invention is to provide a curl correction device that can effectively remove curls by doing so.

(Structure and operation of the invention) FIG. 2 shows the structure of a decurling section according to an embodiment of the invention, and the same parts as in FIG. 1 are designated by the same reference numerals. 12 is a drive roller, 13 is a feed roller, 14 is a feed roller, 16 and 17 are leaf springs for giving conveying force to the rollers 13 and 14, and other symbols are the same as those shown in FIG. It is.

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 feed 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 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. In addition, there is a decurling roller 3 facing the R section, but without this, the paper would not follow the R section and the paper would be ejected without fully reversing the curve, so the decurling roller 3 would not be able to fully remove the curls. do not have. Further, the feeding force of the feed roller 13 is preferably strong for removing the curls and conveying the edge removed portion, and since the feed roller 14 is used only for conveying, a very strong feeding force is not required. Furthermore, if the feeding force of the main conveyance section upstream of the entrance 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 in FIG. 2 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 modified embodiment of FIG. 2, in which the decurling roller 3 is connected to a belt (or a gear) 1
5 is used to rotate in synchronization with the drive roller 12, thereby improving the reliability of paper passing.

FIG. 5 shows another modified embodiment of FIG. 2, in which the feeding and feeding rollers are rotated in synchronization with the drive roller 12 using gears, thereby improving the reliability of paper feeding. Note that the gear 18 is connected to the drive roller shaft 12', and also to the gears 19 and 20.
are the infeed and feed roller shafts 1, respectively.
3' and 14'.

The present invention provides a
A deformation part is provided. If the distance between the feed roller and the deforming section is long, the paper will jam at the deforming section unless the paper is strong. In the present invention, it is possible to remove the kinks by using the feeding force and the stiffness of the paper to advance the paper along a guide with a small radius, so the structure of the kink removing section is simple, especially in the case of an edge type thermal head, etc. It is also possible to use a platen roller (not shown) of the recording section as a feed roller.

(Effects of the Invention) As explained above, although the present invention has a simple structure, it is able to remove even strong curls caused by paper curls, thereby improving the image quality of received images and improving stacking performance. Furthermore, since small rolls can also be used, downsizing is possible. In addition, since rollers are used instead of leaf springs as in the past, conveyance performance is good. Furthermore, since the holding means for holding the lower guide plate and the decurling roller can be opened and closed with respect to the drive roller, paper jams can be easily removed.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of the structure of a paper curl correction unit used in a conventional facsimile machine,
3 shows a modification of FIG. 2; FIG. 4 shows a modification of FIG. 2;
This figure shows another modified embodiment of FIG. 2, and FIG. 5 shows another modified embodiment of FIG. 2. 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 roller, 13'...Feed roller shaft, 14...Feed roller, 14'
...Feeding roller shaft, 15...Belt, 1
6, 17... leaf spring, 18-20... gear.

Claims (1)

[Claims] 1. Upper and lower guide plates for guiding fed paper;
a feeding section consisting of a feeding roller that feeds the fed paper further into the interior; a curl correction section provided downstream of the feeding section and close to the feeding section;
The curl correcting unit has a feeding section consisting of a feeding roller that sends out the curl-corrected paper, and a single driving roller that drives the feeding roller and the feeding roller, and the curl correcting section has a guide with a small radius of curvature at one end of the lower guide plate. and a decurling roller provided on the inner side facing the guide portion, and a holding means for holding the lower guide plate and the decurling roller is configured to be openable and closable with respect to the drive roller. A curl correction device. 2. The curl correction device according to claim 1, wherein the decurling roller rotates in synchronization with the drive roller. 3. The curl correction device according to claim 1, wherein the feed roller rotates in synchronization with the drive roller. 4. The curl correction device according to claim 1, wherein the delivery roller rotates in synchronization with the drive roller.