JPH07392B2 - Winding straightening device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curl correction device that can correct curl when a roll recording sheet for facsimile is conveyed.

2. Description of the Related Art Conventionally, as a curl correction device of this type, for example, an endless belt that rotates from an inlet to an outlet and an idler that presses against the endless belt are provided, and a curled paper or the like is inserted from the inlet to form an endless belt. There is one in which curl is corrected by returning a warp of a paper or the like between the belt and the idler (see Japanese Patent Publication No. 54-39550). However, in the habit correction with this configuration, the amount of habit has not been detected. Therefore, when the diameter of the roll paper is large, on the contrary, there is a problem that when the diameter of the roll paper is small, the correction is insufficient.

Further, as another conventional example, there is provided a means for detecting the presence or absence of curl of the paper and the direction of the curl, and a curl removing means which is located at the rear of the detecting means and controlled by the detecting means. There has been proposed a device which automatically corrects in accordance with the direction (see Japanese Patent Laid-Open No. 56-48343). This is a copying machine, which detects habits, but has a problem that the habit correction mechanism is a roller system and the device is large because it is in both directions, and the cost is high.

An object of the present invention is to improve the conventional problems described above. In curl correction of roll paper, reverse curl due to excessive curl removal is obtained by changing the method of winding curl depending on the diameter and curl amount of the roll paper. Another object of the present invention is to provide a curl straightening device that performs curling due to insufficient curl due to insufficient curl removal.

In order to achieve the above object, the present invention provides a curl correction device for correcting curl by sliding a curl on a recording paper drawn from a recording paper roll to correct the curl.
A straightening guide portion having at least two types of curving portions having curvatures, and a flattening portion that slides on the recording paper when the sensor portion detects that the outer diameter of the recording paper roll has changed from large to small. A guide switching unit for switching from the A-curvature one to the B-curvature one is provided.

EXAMPLE FIG. 1 is an explanatory view showing the flow of roll paper using the curl correction device of the present invention, 1 is a recording paper roll, 2 is a straightening guide portion, 3 is a thermal head, 4 is a feed roller, Reference numeral 5 is a fixed tooth, 6 is a rotating tooth, 7 is a tension roller, 8 is a discharge roller, and 9 is a tray.

The recording paper sent from the recording paper roll 1 is straightened by the curl removing guide portion 2 and then printed and recorded by the recording portion including the thermal head 3 and the feed roller 4, and then the fixed blade 5 and the rotary blade are rotated. The sheet is cut by a cutter portion composed of blades 6, and is discharged onto a tray 9 by a tension roller 7 and a discharge roller 8.

The present invention is conceivable because the smaller the radius of the guide of the habit removing guide section 2, the more the habit can be obtained (a reverse curl is applied), and the wrapping angle of the paper in the habit removing guide section 2 is the greater the habit. It was

That is, as the diameter of the recording paper roll 1 becomes smaller, the curl becomes stronger, and the curl cannot be removed sufficiently unless the radius of the straightening guide portion 2 is made small or the winding angle is made large.
Therefore, when the diameter of the roll paper falls below a certain level,
Move the position of the paper core of the roll paper in the direction of arrow a to increase the wrapping angle, and set the curling guide part to the direction of arrow b.
By rotating the roll paper in the direction to reduce the radius of the guide portion, the state after the straightening is made uniform when the diameter of the roll paper is large and when it is small.

FIG. 2 shows a mechanism for moving the paper tube of the recording paper roll shown in FIG.

This is because when the recording paper roll 1 changes from a large state to a small state such as 1 ', the solenoid 11 is attracted to pull the lever 11B to the right, thereby holding the paper tube of the recording paper roll 1. The lever 11A is rotating counterclockwise about the fulcrum 12. For holding the paper tube, use a shaft-shaped
It may be set to 11A, or the inner diameter of the paper tube may be held by spring-like ones from both ends.

FIG. 3 shows a mechanism for switching the radius of the straightening guide portion.

This is because the lever 14 is operated by the suction of the solenoid 13
The straightening guide 16 supported by 15 is switched so that the radius is changed by the rotation of the shaft. Here, the alternate long and short dash line portion is the straightening guide portion 2, and has the same shape in the depth direction (the paper width direction of the recording paper).

FIG. 4 is a diagram showing another example of the straightening guide switching when the recording paper roll 1 is used in the inner winding.

When the diameter of the recording paper roll 1 is large, the roll paper is curled along the small guide 17 for small curl, but when the shape of the recording paper roll 1 is small, the lever 19 is supported by the fulcrum 20 due to absorption of the solenoid 13. Since the guide 18 for large habits jumps out from the conventional conveying path by rotating clockwise around, the roll paper is blunted by it.

Although the wrapping angle is not changed here by moving the position of the paper tube of the recording paper roll 1, the recording paper roll 1 has a roll paper retainer 22 that rotates around a fulcrum 23.
Is pressed against the roll paper holding plate 21. It is assumed that a roll paper outer diameter sensor (for example, the rotation position of the lever is detected by a photo sensor) is attached to the roll paper retainer 22.

FIG. 5 is a view showing the structure of an embodiment in which the straightening guide can be switched to three stages.

This has a habit small guide 17, a habit middle guide 24, and a habit large guide 18 in three places around the fulcrum 20, respectively, so that fine switching (3 steps) can be performed. Although not shown, the driving can be performed by a motor and a sensor, or a solenoid, a claw, and a ratchet wheel.

In the present invention, in addition to the above, a rotary solenoid may be used in place of the solenoid 13 in FIG. 3, and a solenoid and a motor may be used instead of the solenoid in FIGS. good. Further, FIG. 2 and FIG.
In the figure, a solenoid or a motor, which is a control system, may be shared and both controls may be performed simultaneously. However, it is more difficult to carry out the straightening in three steps if done independently.

Further, when the radius of the straightening guide is small, it is better to project to the paper passing surface in order to increase the wrapping angle than when the radius is large.

The example in which the curling guide portion is arranged before recording has been described, but it may be arranged after recording or after cutting. Although the start of changing the curl has been described by detecting the outer diameter of the roll, a sensor for detecting the curl amount may be provided during the conveyance.

In addition, moving the position of the roll paper core in the roll paper storage does not increase the size of the device itself. Fine habits can be removed.

Effect As described above, the present invention corrects the curl by changing the center position of the roll paper according to the diameter or curl amount of the recording paper roll, changing the wrap angle with respect to the curl guide section, or changing the radius of the curl guide section. The effect of overcorrection is eliminated and fine correction can be achieved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the flow of roll paper using the curl straightening device of the present invention, FIG. 2 is a view showing a mechanism for moving the paper tube of the recording paper roll of FIG. 1, and FIG. The figure shows a mechanism for switching the radius of the straightening guide part, FIG. 4 shows another example of the straightening guide switching when the recording paper roll is used inwardly, and FIG. It is a figure which shows the structure of one Example which changed the picking guide to 3 steps | paragraphs. 1,1 '…… Recording paper roll, 2 …… Blank guide section, 3
... Thermal head, 4 Feed roller, 5 Fixed blade, 6 Rotating blade, 7 Tension roller, 8
Discharge roller, 9 ... Tray, 10, 13 ... Solenoid,
11A, 11B, 14, 19 …… Lever, 12, 15, 20, 23 …… Support point, 16…
… Badness removing guide, 17 …… Bad small guide, 18 …… Bad large guide, 21 …… Roll paper holding plate, 22 …… Roll paper retainer, 24 …… Bad medium guide.

Claims (1)

[Claims] 1. A curl correction device for correcting curl by sliding a curl removing portion onto a recording paper pulled out from a recording paper roll, and a sensor unit for detecting a change in the outer diameter of the recording paper roll, The outer diameter of the recording paper roll is changed from large to small by the straightening guide portion having at least two kinds of straightening portions having an A curvature and a B curvature that is smaller than the A curvature. A curl correction device, comprising: a guide switching unit that switches the curl removing portion that comes into sliding contact with the recording paper from the A curvature type to the B curvature type when detected.