JPH0445052A - Curl straightener - Google Patents

Abstract

PURPOSE:To perform the straightening of a curl averagely by installing a curl straightening means which shows the maximum ironing effect in a width central part, where tension in a sheet of roll paper becomes minimized, and reduces the ironing effect toward both ends where it becomes maximized. CONSTITUTION:A chart 20 drawn out of a chart storage chamber is ironed by a curl straightening means 26 while it is drawn out by a platen 23. This curl straightening means 26 is composed of a metal or plastic ironing plate, and respective ironing surfaces 26a-26c are not uniform, that is, each is formed into a circular surface that curvature at both ends (a) is small but that at the center (c) is large. Accordingly, the central part, where tension of the chart 20 comes to minimum, is large in curvature and small in ironing effect, but both the ends, where the tension is large, show a large ironing effect with the small curvature. Therefore in the chart 20, the ironing effect is averagely brought into full play in the cross direction.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a method for curl correction in which curls are removed by squeezing unfed recording paper in copying machines, facsimile machines, etc. that use roll paper as recording paper. between the devices.

[Background of the Invention] Rolled thermal recording paper is widely used in facsimile machines.

This heat-sensitive recording paper is coated with a white or transparent coloring agent in which leuco dye and phenol compound are dispersed in a binder so that they do not come into contact with each other, and the binder in the coloring agent is removed by contact heating with a thermal head. When melted, the leuco dye and phenol compound come into contact, causing a chemical reaction that produces a black color.

The above-mentioned recording paper has a coloring agent coated on one side and is in roll form, so when it is unrolled and printed, it inevitably curls, and this tendency becomes more noticeable as it approaches the original volume. . In addition, this curl caused the paper to jam at the paper exit.

As a means to prevent such curling, as shown in FIG. The end of the guide 27 is raised at a substantially right angle, and the recording paper 20 is squeezed at the corner to correct curling.

As another means, as shown in FIG. 6, an ironing plate 2 is installed above the area between the recording paper storage chamber 21, the thermal pad 22 for printing, and the platen 23 for feeding out the recording paper.
With the help of #6, the curling of the recording paper 20 was corrected using the rubbing board #26.

[Problem to be Solved by the Invention] Both the corner of the upper guide 27 shown in FIG. 5 and the ironing plate 26# shown in FIG. Ta.

However, the stiffening effect is greatest at both ends in the width direction where the tension is maximum, and the tension is weaker in the center of the width direction, making it impossible to obtain a sufficient effect. was not obtained.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a curl correction means in which a paper feed roller that pulls the roll paper in the paper feeding direction from the roll paper feed opening is provided with a curl correction means. The straightening device is characterized by being provided with a curl straightening means that exerts the greatest straining effect at the center of the curl of the roll paper where the tension is lowest, and reduces the straining effect toward both ends where the tension is highest. It is something to do.

[Function] In FIGS. 1 to 3 showing the first example of implementation, when image information is received, a receiving motor (not shown) starts, and the platen 23 as a paper feeding roller rotates clockwise. The recording paper 20 is sequentially fed out from the recording paper storage chamber 21.

At this time, the curl correction means 26 disposed from the outlet (recording paper feeding opening) of the recording paper storage chamber 21 to the platen 23 tightens the curl.

This squeezing is weak at both ends where the tension by the platen 23 is maximum, and strong at the center where the tension is minimum.

The same applies to the second implementation example shown in FIG.

[Embodiment] Next, as an embodiment of the curl straightening device according to the present invention, an example in which silk is applied to a facsimile machine will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram of a facsimile machine F incorporating a curl straightening device according to the present invention.

In FIG. 1, the facsimile machine F is composed of a box-type exterior case 1, a transmitting means 2 for reading original images with an optical reading system, and a receiving means 3 for printing and recording incoming image information. There is.

The exterior case 1 includes a lower cover 4 serving as a base, a back cover 6 to which a reception tray 5 is attached, site covers 7.7 on both sides (only one is shown), and a transmission door with an operation panel 8 on the top surface. It consists of a cover 9 and a reception door 10 arranged on the rear side of the top surface.

The operation panel 8 disposed on the slanted upper surface of the exterior case l is connected to the LCD board (rI!) of the liquid crystal display unit as usual.
J (not shown) and a panel assembly (not shown) of pushbutton switches such as a numeric keypad are arranged.

The transmitting means 2 includes a document stacker 11 mounted on the upper part of the upper surface of the outer case 1, a separation bat unit 13 that separates the bi-leaf documents 12 one by one, and a self-supplying roller 14 that sends the separated documents 12 to the optical system. The document stacker 11 is composed of a pressure roller 15, a feed roller 16, a paper ejection roller 17, and an optical reading unit 18 disposed below the self-feeding roller 14, which are arranged opposite to each other across the surface on which the document 12 moves.
The multi-page originals 12 stacked on top are separated one by one, the images are read by the optical reading unit 18, and the images are sent out to the paper discharge port I9.

The image signal read by the optical reading unit 18 is transmitted to the other party using a communication line.

The receiving means 3 includes a recording paper storage chamber 21 that stores a roll of recording paper 20 in a manner that it can be freely fed out, and a curl correction means 26 that squeezes the recording paper 20 that is fed out from the recording paper storage chamber 21.
It is composed of a thermal head 22 and a platen 23 that print and record the image information transmitted to the recording paper 20, and a cutter unit 24 that cuts the recording paper 20 on which the received information is printed and recorded into a predetermined length. The transmitted image information is marked '71. on the iL's recording paper 20. ．． ．． Pfi
Fixed length (, □'' Cut 1 and publish from RL 25 to Receive 1.I 51. ζ.

FIG. 2 is a schematic perspective view ζ' showing a first embodiment of the present invention ζ and the curl straightening device.

In this $2 figure, the curl (j)→-stage 2.6 is the result of one unrolled roll of recording paper 20 and one roll of recording paper 20.
Graphene 12 as one FF-1 for feeding paper
A state in which the recording paper 20 that runs in three leaps t'1' is squeezed ゛ζ
will be placed.

Note that the recording paper 20 is biased against the platen 23J and the marble 22.

The curl correction means 26 is a sawing board made of metal or synthetic resin, and has a cutting surface 26a on the lower surface.

As shown in Fig. 3, 26b and 26e have no uniform C, the curvature of both ends a and a is small, and the curvature of the center C becomes large, so that a large straining effect is exerted. There is.

FIG. 3(a) is an enlarged sectional view of both ends ma, a of the curl correction means 26 shown in FIG.

In FIG. 3(a), the straining surface 26a is formed with a curved surface having a center of curvature 01 and a radius rl, and produces a small straining effect 111.

3' is an enlarged cross-sectional view of the middle part of the first stage 26 of the first stage 26 in Figure 2.

This (D Fig. 83 (b)) Ni:J:;ii2,Si(!゛ki% 26b) A curved surface with an intermediate curve 1X with a center of curvature of 02 and a radius of c2 is formed, and an intermediate straining effect is obtained. Demonstrate your abilities.

FIG. 3 ((•) is an enlarged cross-sectional view of the central portion C of the edge/curl correction means 26 in FIG. 2).

The straining surface 2B+ is formed with a curved surface having a center of curvature 03 and a radius r3, and exhibits a large straining effect.

In this way, the curl correction means 26 of the first embodiment suppresses the squeezing effect in both I11 parts where the tension is maximum, and maximizes the squeezing effect in the center where the tension is minimal. By doing so, an average squeezing effect is exerted in the width direction of the recording paper 20.

FIG. 4 is a schematic perspective view showing a second embodiment of the curl correction device according to the present invention.

In FIG. 4, the curl correction means 26' rotates in one direction every time the roll-shaped recording paper 20 is fed out.
The recording paper 20 running between the platens 23 and 23 which feeds out the recording paper 20 is arranged in a squeezed state.

The recording paper 20 is pushed one by one by the thermal head 22 on the platen 23.

Then, the curl correction means 26' is made of metal or vp.
! The cutting board is made of high quality synthetic resin, and the cutting surface 26'a on the lower surface is configured in an arc shape.

Therefore, a large squeezing effect is exerted at the center where the tension on the recording paper 20 is weak, and the squeezing effect decreases toward the outside where the tension on the recording paper 20 is stronger, and as a whole, the squeezing effect is exerted in the width direction of the recording paper 20. On the other hand, the average straining effect is demonstrated first.

In addition, in the embodiment described in 1-1, the curl correction means 26° 26
' is provided downward through the soil guide plate 27, but as shown in FIG. Good too.

[Effects of the Invention As shown in L, the curl straightening device according to the present invention exhibits the maximum straining effect at the center n of the width of the roll paper where the tension is lowest, and at both ends t where the tension is highest. A curl correction means that reduces the stiffening effect is arranged between the roll paper feed opening and the paper feed roller.

With this method, the curls are evenly corrected and the paper is stretched flat.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a facsimile machine incorporating a curl correction device according to the present invention, FIG. 2 is a perspective view showing a first example of implementation of the curl correction device, and FIGS. 3(a) and (b)
), (c) are enlarged sectional views of parts a, l) and C in Fig. 2, Fig. 4 is a perspective view showing a second implementation example of the curl straightening device according to the present invention, and Fig. 5 is a conventional example. , - and FIG. 6 is a schematic sectional view of the second conventional example. F...Facsimile machine 20...Recording paper 21...Recording paper storage chamber 22...Thermal head 23 Fist jar/platen 26.26'...Curl correction means 26 Force correcting means Fig. (+12) (shi) (c) 26 curls drying position diagram n boo burnt (7 hetsu r < diagram

Claims (1)

[Claims] (1) In a curl straightening device in which a curl straightening means is provided between the paper feeding rollers that pull the roll paper in the paper feeding direction from the roll paper feed opening, the maximum tension is placed at the center of the width of the roll paper where the tension is the lowest. A curl straightening device characterized by being provided with a curl straightening means in which the squeezing effect decreases toward both ends where the squeezing effect is exerted and the tension is highest.