JPH04189573A - Curl correction device and recording device having the curl correction 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 <Industrial Application Field> The present invention relates to a curl correction device for correcting the curl of a recording sheet wound into a roll, and a recording apparatus having the curl correction device.

<Conventional technology> Office equipment such as facsimile machines and printers have been widely used in the past, and the recording systems of these devices generally use sheet rolls in which long recording sheets are wound around a core. .

Because the recording sheets mentioned above are wound in a roll, they tend to curl (hereinafter referred to as "curls"), and curled recording sheets can cause jams during transportation.
becomes easier to produce. For this reason, many recording apparatuses using the sheet roll are equipped with a curl correction device equipped with a curl correction member for correcting or reducing curl. This curl straightening device will be illustrated below.

First, as shown in FIG. 9, the apparatus main body 50 and the lid 51 are configured to be openable and closable with a pin 52, and a roll holder 53. Platen roller 54. cutter 55
a, 55b, and a roller shaft 56 which is a curl correction member, and a recording head 57 is provided on the lid body 51.

In the above recording device, the recording sheet 58 is placed on the winding core 58a.
A sheet roll 58b wound into a roll is loaded into the roll holder 53, and the recording sheets are conveyed by rotation of the platen roller 54. At this time,
When the recording sheet 58 passes through the roller shaft 56, the recording sheet 58 is bent in the opposite direction to the curl to reduce the curl and is conveyed to the recording head 57.
On the other hand, an image is formed by the recording head 57 according to the recording information, the image is cut from the trailing edge by the canter 55, and the image is discharged out of the apparatus by a pair of discharge rollers 59a and 59b.

FIG. 12 also shows the device main body 5 as a curl correction member.
A guide member 56a is provided in the inside of the curl correction device, and a guide member 56b that constitutes a curl correction device together with the guide member 56'a is provided in the lid 51.

In the above recording device, when the recording sheet 58 passes through the bending path formed by the guide members 56a and 56b, it is bent in the opposite direction to the curl, thereby reducing the curl and conveying it to the recording head 57. It is something.

<Problems to be Solved by the Invention> However, in the curl straightening device shown in FIG. 9, when the roll diameter of the sheet roll 58b is large, the wrapping of the recording sheet 58 around the roller shaft 56 is . is small and the curl of the recording sheet 58 is relatively weak, so that an appropriate curl correction effect can be obtained. However, as shown in FIGS. 10 and 11, the sheet roll 58b
As the roll diameter of the recording sheet 58 becomes smaller, the curl of the recording sheet 58 becomes stronger, whereas the recording sheet 58 is wrapped around the roller shaft 56 at an angle θ. As a result, there is a possibility that a sufficient curl correction effect of the recording sheet 58 may not be obtained.

Further, since the roller shaft 56 is fixed to the main body 50 of the apparatus, it is often difficult to pull out the leading end of the recording sheet 58 and insert it to the platen roller 54 when loading the sheet roll 58b.

Furthermore, in the curl straightening device shown in Section 12, the recording sheet 58 is kept folded between the guide members 56a and 56b in the recording standby state, so if the standby state is long, the recording sheet 58 will curl backwards. There was a risk that this would occur.

Furthermore, since the bending angles of the guide members 56a and 56b that perform curl correction are always constant, it is difficult to properly correct curls that vary depending on the roll diameter.

The present invention solves the problems of the prior art described above, and by pressing the curl correction member against the outer periphery of the sheet roll or by pressing the recording sort with the curl correction member, curling can be prevented even if the roll diameter changes. It is an object of the present invention to provide a curl correction device capable of properly correcting curls and a recording device having the curl correction device.

<Means for Solving the Problems> A typical means for solving the above-mentioned problems of the prior art and applied to the embodiments described below is a loading member for loading a sheet roll in which a recording sheet is wound into a roll. a conveyance means for conveying the recording sheet from the sheet roll loaded on the loading member; a curl correction member for correcting the curl of the recording sheet pulled out from the sheet roll; and biasing means for pressing the roll against the outer periphery of the roll.

Further, the recording apparatus includes the curl correction device and recording means for forming an image on the recording sheet according to recording information.

According to the above means, since the curl correction member is constantly pressed against the outer periphery of the sheet roll by the urging means, the winding of the recording sheet around the curl correction member becomes angular in response to changes in the winding diameter of the sheet roll. changes.

Alternatively, when the curl correction member presses the recording sheet using the urging means while maintaining a position where the conveying force of the conveying means and the urging force of the urging means are balanced, the recording sheet may be corrected according to changes in the winding diameter of the sheet roll. When the sheet is wrapped around the curl correction member, the angle changes.

Further, when the cover of the sheet roll is opened, the biasing force of the curl correction member is released and retreated,
Sheet rolls can be easily taken out and loaded.

Further, when the pressure on the recording sheet by the urging means is released while the recording sheet is reversely conveyed by the conveyance means and is placed on standby, the recording sheet can be given slack to prevent reverse curling.

Furthermore, when the recording device is equipped with the curl correction device, it is possible to prevent the recording sheet from curling, etc.
Image quality can be maintained.

<Embodiment> An embodiment of a recording apparatus to which the present invention is applied will be described below with reference to the drawings.

Fig. 1 is a perspective explanatory view showing the main parts of the curl correction device;
4 through 4 are cross-sectional explanatory views of the recording apparatus.

First, a schematic configuration of a recording apparatus to which the present invention is applied will be explained with reference to FIGS. 1 and 2.

1 is a housing-like device body, and a fulcrum 2 is provided on the top side of the device body.
A lid body 3 is attached so as to be openable and closable.

Reference numeral 4 denotes a heat-sensitive recording sheet that develops color when heated, and a sheet roll 4b in which the elongated recording sheet 4 is wound around an inner core 4a in the apparatus main body l is a drop-in type roll that is a loading member. It is loaded into the holder 5.

A roller shaft 6, which is a curl correction member, is provided at a portion of the sheet roll 4b where the recording sheet 4 is pulled out. Both ends of the roller shaft 6 are held movably within guide grooves 7 provided on the side surfaces of the main body 1 of the apparatus.

Further, a tension coil spring 9, which is a biasing means, is connected to both ends of the roller shaft 6, and one end of which is fixed to a fixed shaft 8 projecting from the side surface of the main body l of the apparatus. Therefore, due to the elastic force of the tension coil spring 9, the roller shaft 6 is pressed against the outer periphery of the sheet roll 4b at the part where the recording sheet 4 is pulled out from the sheet roll 4b. Thereby, the recording sheet 4 is wound around the roller shaft 6 in the opposite direction to the curl and is squeezed, thereby making it possible to correct the curl.

Reference numeral 10 denotes a recording head, which is a recording means, and includes heating elements that are individually energized and generate heat in accordance with recording information, which are arranged in a row in the width direction.

A platen roller 11 is a means for conveying the recording sheet 4, and is made of a material having a high g-friction coefficient, such as hard rubber, molded into a roller shape, and is rotationally driven by a drive source (not shown). Further, the recording head 10 is configured to come into pressure contact with the surface of the platen roller 11.

Reference numerals 12a and 12b are counters for cutting the recording sheet 4 in page units after image recording, and 13a and 13b are a pair of discharge rollers for discharging the cut recording sheet 4 out of the apparatus.

The recording sheet 4 pulled out from the sheet roll 4b has its curl corrected on the roller shaft 6 by rotating the platen roller 11, and is conveyed to the recording head 10.

An image is recorded on the recording sheet 4 by conveying the recording sheet 4 and synchronously generating heat from the heating element of the recording bed 1o corresponding to the recording information.

The recorded recording sheet 4 is canted page by page by the cutters 12a and 12b, and then the discharge roller pair 13a,
13b, it is discharged from the device.

Next, the curl correction operation of the recording sheet 4 when the winding diameter of the sheet roll 4b changes will be explained with reference to FIGS. 2 to 4.

As mentioned above, the roller shaft 6 moves within the guide groove 7 due to the elastic force of the tension coil spring 9 and moves toward the sheet roll 4b.
It is constantly in pressure contact with the outer periphery of the

Therefore, as the winding diameter of the sheet roll 4b becomes smaller (as shown in FIGS. 2 to 3 and 4), the curl of the recording sort 40 becomes stronger, but the winding angle around the roller shaft 6 becomes smaller. Since θ becomes small, the curl can be properly corrected according to the winding diameter of the sheet roll 4b.

In addition, when replacing the sheet roll 4b, the lid 3
When the roller shaft 6 is released around the fulcrum 2, the roller shaft 6 retreats along the guide groove 7 to the upper end position shown at 6', making it easier to load the sheet roll 4b and to move the recording sheet 4 up to the platen roller 11. Easy to pull out and set.

<Other Embodiments> Next, other embodiments of the curl straightening device shown in the above embodiments will be described with reference to FIGS. 5 to 8.

In the embodiment described above, even if the winding diameter of the sheet roll 4b changes, the roller shaft 6 is brought into pressure contact with the outer periphery of the sheet roll 4b.

In this embodiment, as shown in FIG. 5, the roller shaft 6 is configured to press the recording sheet 4 instead of the outer periphery of the sheet roll 4b.

That is, the roller shaft 6 is configured to stop and press the recording sheet 4 at a position where the conveyance force by the platen roller 11 and the urging force by the tension coil spring 9 are balanced.

Next, the curl correction operation of the recording sheet 4 when the winding diameter of the sheet roll 4b changes will be explained with reference to FIGS. 6 and 7.

In FIG. 6, when the winding diameter of the sheet roll 4b is large, while the recording sheet 4 is being conveyed in the direction of the arrow a,
The tension f1 applied to the recording sheet 4 in the roller shaft 6 is given by the weight of the sheet roll 4b and the conveyance force by the platen roller 11, and this tension f1 is applied to the recording sheet 4 at the roller shaft 6.
1 and the biasing force f2 by the tension coil spring 9, the angle θ of the winding of the recording sheet 4 around the roller shaft 6 is set to be large. Therefore, when the winding diameter is large, the curl is relatively weak and the curl correction force is also set small.

Next, in the seventh time, when the winding diameter of the sheet roll 4b is small, the tension f applied to the recording sheet 4 at the roller shaft 6 is greater than the tension f1 while the recording sort 4 is being conveyed in the direction of the arrow a. The angle θ2 of the recording sheet 4 around the roller shaft 6 is set small, which is applied by the weight of the sheet roll 4b and the conveyance force by the platen roller 10, and by this tension f3 and the biasing force f4 by the tension coil spring 9. .

Therefore, when the winding diameter is small, the curl is relatively strong and the curl correction force is also set to be large.

According to the above configuration, the roller shaft 6 moves within the guide groove 7 in response to changes in the winding diameter of the sheet roll 4b, and the winding angle of the recording sheet 4 changes, so that curls can be corrected appropriately. I can do it.

Further, when the recording apparatus is in a recording standby state, it is possible to make the recording sheet 4 slack.

That is, as shown in FIG. 8, after the recorded recording sheet 4 is cut into pages, the recording saw 14 is conveyed by a certain amount by the rotation of the platen roller 11 in the direction of arrow A, and then the platen roller By rotating in the direction of arrow B 11, the leading edge of the recording sheet 4 is returned to the recording position of the recording head 10.

At this time, the roller shaft 6 comes into pressure contact with the outer periphery of the sheet roll 4b due to the urging force of the tension coil spring 9, and the pressure on the recording sheet 4 is released, so that there is no slack between the sheet roll 4b and the platen roller 11. arise. Therefore,
In the recording standby state, it is possible to prevent reverse curl from occurring on the recording sheet 4.

Note that by rotating the platen roller 11 in the direction of arrow B,
As long as the recording sheet 4 is fed backwards and the roller shaft 6 releases the pressure on the recording sheet 4, even if the winding diameter of the sheet roll 4b changes, the recording sheet will be removed by the rotation of the platen roller 11 in the direction of arrow A. By changing the amount of conveyance of the recording sheet 4, it is possible to maintain an appropriate amount of slack in the recording sheet 4.

Further, the roller shaft 6 and the wire shaft 14 attached to the lid 3 are connected by a wire (not shown). Therefore, when the lid body 3 is rotated around the fulcrum 2 to open the top surface of the device main body 1, the wire is pulled upward and the roller shaft 6 moves along the guide groove 7 to the position 6' and retreats. do. Further, the recording head 10 is also retracted together with the lid 3.

Therefore, the transport path for the recording sheet 4 is wide open, so
It becomes easy to replace the sheet roll 4b and set the recording sheet 4.

In each of the embodiments described above, the biasing means for the roller shaft 6 is not limited to a tension coil spring, but may be a torsion coil spring or the like, for example.

It goes without saying that the recording apparatus shown in this embodiment can be applied to various recording apparatuses such as a printer 2 facsimile.

<Effects of the Invention> As described above, in the present invention, since the curl correction member is constantly pressed against the outer periphery of the sheet roll by the urging means, the curl correction member of the recording sheet can be moved in accordance with changes in the winding diameter of the sheet roll. The angle of wrapping changes.

Alternatively, since the curl correction member presses the recording sheet while maintaining a position where the conveyance force of the conveyance means and the urging force of the urging means are balanced, the curl correction member of the recording sheet is pressed in accordance with a change in the winding diameter of the sheet roll. The angle of the winding changes.

Therefore, the curl correction member moves according to the winding diameter of the sheet roll, and the angle at which the recording sheet is wound around the curl correction member changes, so that curls that differ depending on the winding diameter can be properly corrected.

Further, when the cover of the sheet roll is opened, the biasing force of the curl correction member is released and retreated,
Sheet rolls can be easily taken out and loaded.

Further, when the pressure on the recording sheet by the urging means is released while the recording sheet is reversely conveyed by the conveyance means and is on standby, the recording sheet can be given slack to prevent reverse curling.

Furthermore, when the recording device is equipped with the curl correction device, it is possible to prevent the recording sheet from curling, etc.
'Image quality can be maintained.

[Brief explanation of the drawings] Fig. 1 is a perspective explanatory view showing the main parts of the curl correction device;
4 to 4 are cross-sectional views of the recording apparatus, FIGS. 5 to 8 are views of the other side, and FIGS. 9 to 12 are views of the conventional example. 1 is the device body, 2 is the fulcrum, 3 is the lid, 4 is the recording sheet,
4a is an inner core, 4b is a sheet roll, 5 is a roll holder, 6 is a roller shaft, 7 is a guide groove, 8 is a fixed shaft, 9 is a tension coil spring, 10 is a recording head, 11 is a platen roller, 12a and 12b are cutters , 13a, 1
3b is a pair of discharge rollers, and 14 is a wire shaft.

Claims (6)

[Claims] (1) a loading member for loading a sheet roll with a recording sheet wound thereon; a conveyance means for conveying the recording sheet from the sheet roll loaded on the loading member; A curl correction device comprising: a curl correction member for correcting curls in a recording sheet; and a biasing means for pressing the curl correction member against an outer periphery of a sheet roll. (2) The curl correction device according to claim 1, wherein the curl correction member moves in accordance with a change in the winding diameter of the sheet roll. (3) The curl correction device according to claim 1, wherein the urging means presses the curl correction member against the recording sheet. (4) The curl straightening device according to claim 3, wherein the curl straightening member stops at a position where the conveying force by the conveying means and the urging force by the urging means are balanced. (5) The curl straightening device according to claim 3, wherein the pressure on the recording sheet by the urging means is released while the recording sheet is reversely conveyed by the conveying means and placed on standby. (6) A recording apparatus comprising: the curl correction device according to any one of claims (1) to (5); and a recording means for forming an image on the recording sheet according to recording information.