JPH082766A - Print recording apparatus and method for removing curl of the apparatus - Google Patents

Abstract

PURPOSE:To prevent forming a reversely bending habit in recording paper by a curl removing mechanism at unused time, in a recording device having the curl removing mechanism of recording paper. CONSTITUTION:Thermosensible recording paper 3 is pressed by a press contact roller 4 and recorded by a thermosensible recording head 5. The thermosensible recording paper 3 wound in a roll shape is curled after recording discharge. In order to prevent this curling, a reversely warped part 8 having a reverse round part R is provided, to generally remove a curl by pressing the thermosensible recording paper 3 with the reverse R part between an in-coming side guide 9 and an out-going side guide 10. However, in this condition, when held for a long time, a reversely bending habit is formed by the reverse R part in the thermosensible recording paper 3. Therefore, here is provided a means turning the reversely warped part 8 in the counterclockwise direction after ending recording and also pulling back a point end of the thermosensible recording paper 3 to just before the thermosensible recording head 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing recording apparatus capable of keeping a printed recording sheet flat and improving file characteristics in a facsimile, a printer or the like, and a curl removing method for the apparatus.

[0002]

2. Description of the Related Art For example, a heat-sensitive recording apparatus is often used by mounting it on the apparatus in a state where a heat-sensitive recording paper is wound in a roll shape in order to downsize the apparatus. In this case, since the thermosensitive recording paper has a strong curl in the portion near the core of the roll, the thermosensitive recording paper after recording becomes roll-shaped, and the recorded contents are In order to see it, it was necessary to wind the roll-shaped heat-sensitive recording paper in the opposite direction and take a curl. In the case of a thermal recording device with a cutter, the
One sheet of thermal recording paper rolls up and scatters,
The usability was extremely poor.

As a method of removing the curl of the recording thermal paper, a reverse warping roller is provided between the recording paper roll and the thermal recording section, and the reverse warping roller is used as the thermal recording paper. It is known to carry out curling by pressing. However, if the thermal recording device is not used for a long time, the thermal recording paper has a drawback that the portion against which the reverse warping roller is pressed is bent in the opposite direction.

In view of this, Japanese Patent Laid-Open No. 61-64655 or Japanese Utility Model Laid-Open No. 58-75251 proposes a device for canceling the reverse warping roller at the time of non-recording. In these devices, a solenoid connected to the reverse sled roller is provided, and the reverse sled roller is pressed against the heat-sensitive recording paper at the time of recording. It is designed to be separated from the thermal recording paper by a solenoid.

[0005]

However, in the above-mentioned prior art, the roll for the curl removing mechanism of the thermal recording paper is used.
In addition to the heat sensitive recording paper, a solenoid or the like is required as a control means for preventing the curl of the thermal recording paper when it is not used, and a dedicated control circuit for controlling the operation of the solenoid or the like must be provided. There is a problem that the recording device becomes complicated and expensive.

An object of the present invention is to provide a print recording apparatus and a method for removing the curl of the apparatus, which can avoid curling of the thermal recording paper or the recording paper when not in use by using a simple mechanism. is there.

[0007]

In order to achieve the above object, the present invention relates to a thermal recording paper which is wound in a roll shape and curled with a certain curvature, and a thermal recording head for printing on the thermal recording paper. A pressure contact roller that conveys the heat sensitive recording paper in pressure contact with the heat sensitive recording head; a power unit that rotationally drives the pressure contact roller; and the heat sensitive recording paper by bending the heat sensitive recording paper to an opposite curvature. In the image recording apparatus having the curl removing mechanism for removing the curl, the releasing means is provided for canceling the curl removing operation on the thermal recording paper by the curl removing mechanism at the end of recording.

Specifically, at the end of recording, the operation of the curl removing mechanism may be stopped so that the curl removing mechanism cannot bend the thermosensitive recording paper to the opposite curvature, or the pressure roller may be provided. The thermal recording paper may be reversed so that it has a slack.

The present invention can also be applied to an image recording apparatus that prints on recording paper using an ink film having an ink layer.

[0010]

According to the above construction, at the time of recording, the thermosensitive recording paper is bent by the curl removing mechanism to have an opposite curvature, and the curl is removed before printing out. Then, even after the recording is finished, the curl in the opposite direction is attached when the state remains as it is, that is, the thermal recording sheet is still bent to the opposite curvature by the curl removing mechanism, but as in the above configuration,
If you cancel the curl removal operation at the end of recording,
Curling in the opposite direction is prevented, and the first thermal recording paper to be printed out next time can be flattened.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a longitudinal section of an image recording apparatus according to the first embodiment of the present invention. As shown in the figure,
A thermosensitive recording paper 3 wound in a roll is set on the inner recording paper tray 2, and the thermosensitive recording paper 3 is conveyed by being pressed against a thermal recording head 5 by a pressing roller 4. And
The thermal recording paper 3 is printed by the thermal recording head 5 when passing under the thermal recording head 5 during conveyance. A power transmission unit 6 composed of a gear train is connected to the pressure contact roller 4, and the rotational force of the motor 7 is transmitted to the pressure contact roller 4 via the power transmission unit 6.

Since the thermosensitive recording paper 3 is wound in a roll, the thermosensitive recording paper 3 is curled after recording and discharging. In order to prevent this, a reverse sled component 8 is provided. The reverse sled component 8 is a lever-shaped component, and the reverse R portion 8a at the tip of the reverse sled component 8 is provided between the inlet side guide 9 and the outlet side guide 10 to form the thermosensitive recording paper 3.
By pressing it against the paper surface, the heat-sensitive recording paper 3 is given a curvature opposite to the curled curvature. The reverse sled component 8 is attached to the gear 6a, which is one of the components of the power transmission unit 6, via the torque limiter 11, and the upper stopper 12 and the lower stopper 1 are attached.
Rotate between 3

The pressure contact roller 4, the thermal recording head 5, the power transmission section 6, the inlet side guide 9, the outlet side guide 10, the torque limiter 11, the upper stopper 12 and the lower stopper 13 are attached to the chassis 14, respectively. . FIG. 3 shows how the above-mentioned components are attached to the chassis 14.
Shown in In FIG. 3, 11a is a power transmission shaft for transmitting the rotation of the gear 6a to the reverse sled component 8 via the torque limiter 11.

FIG. 4 shows a detailed structure of the reverse sled component 8. Both sides of the reverse sled component 8 are formed in a substantially L shape, and one end of the L shape is a reverse R portion 8a. The reverse R portion 8a is provided in the width direction of the reverse sled component 8, and the cross-sectional shape of the tip thereof is formed in a round shape. Reference numeral 8b is a thermal recording paper guide, which is formed in a plate shape having a cylindrical surface.

In the heat-sensitive recording apparatus having the above-described structure, the reverse sled component 8 rotates clockwise along with the rotation of the pressure roller 4 during recording. In this case, the reverse sled component 8 is
It is connected to the gear 6a of the power transmission unit 6 via the limiter 11, and since the upper stopper 12 and the lower stopper 13 for restricting the turning angle of the reverse sled component 8 are provided, the reverse sled is provided. The positional relationship between the reverse R portion 8a of the component 8, the entrance side guide 9 and the exit side guide 10 can be kept constant. As a result, the reverse R portion 8a is stably held between the entrance side guide 9 and the exit side guide 10, and in this state, the reverse R portion 8a is held.
a bends the thermal recording paper 3 to the opposite curvature,
It is possible to remove the curl from the thermal recording paper 3.

Next, after the recording is completed, in order to save the thermal recording paper 3, the tip of the thermal recording paper 3 is placed just before the thermal recording head 4 from the position of a cutter (not shown) provided on the output side of the thermal recording head 5. Control to return to is performed. In this control, the gear 6a rotates counterclockwise, and the reverse sled component 8 also rotates counterclockwise accordingly, so that the curled state of the thermosensitive recording paper 3 is released. As a result, as shown in FIG.
It is possible to avoid a situation in which the reverse warp mechanism causes a bending tendency in the recording standby state, since the space between the output side guide 10 and the output side guide 10 is substantially flat. In FIGS. 1 and 2, reference numeral 3a indicates an already recorded portion, and after the recording is completed, the recording portion 3a moves from the position of FIG. 1 to the position of FIG.

In this embodiment, the inverted R portion 8a has a shape with a predetermined curvature, but the portion in contact with the thermal recording paper 3 may be a roller having a diameter of 6 mm or less to obtain the reverse warp effect. . In this case, by making the roller rotatable, the carrying load at the reverse R portion 8a is reduced, and the motor 7
There is an effect that the torque capacity of can be made small.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention. The feature of this embodiment is that the driven gear 6b is rotatably provided on the upper case 1a side of the housing 1, and the reverse sled component 8 is attached to the driven gear 6b via the torque limiter 11. During recording, the driven gear 6b rotates in the clockwise direction in the drawing with the rotation of the power transmission section 6, whereby the curl of the thermosensitive recording paper 3 can be removed. After recording, the driven gear 6b reversely rotates with the reverse rotation of the power transmission unit 6 and the driven gear 6b rotates counterclockwise, so that the curled state is released.

Further, in this embodiment, the thermal recording head 5 is also attached to the upper case 1a side via a pressure contact force applying mechanism (not shown), and when the upper case 1a is opened with the opening / closing pin 15 as the center of rotation, The thermal recording head 5, the reverse sled component 8 and the like move together with the upper case 1a, so that the thermal recording paper 3 has its upper surface exposed. Therefore, the thermal recording paper 3
When replacing the paper, insert the tip of the thermal recording paper 3 into the cutter 16
There is an operability advantage that the thermosensitive recording paper 3 can be replaced with one touch by simply closing the upper case 1a after passing through.

(Third Embodiment) FIGS. 6 and 7 show a third embodiment of the present invention. The feature of the present embodiment is that a friction roller 17 is provided integrally with one gear forming the power transmission unit 6, a fan-shaped friction sliding member 18 in contact with the friction roller 17, and the friction sliding member. The reverse sled part 8 attached to 18 is provided. The friction slide member 18 and the reverse sled component 8 are attached to the upper case 1a via the elastic support member 19. When the upper case 1a is opened with the opening / closing pin 15 as the center of rotation, the friction slide member 18 and the reverse slide member 8 are reversed. The sled component 8 moves together with the upper case 1a, and the upper surface of the thermal recording paper 3 is exposed as in the case of the second embodiment.

In the above structure, at the time of recording, the friction roller 17 is rotated in accordance with the rotation of the power transmission unit 6 and the friction sliding member 18 is rotated, so that the reverse sled component 8 is rotated clockwise in the drawing. Then, the reverse sled component 8 stops at the position of the lower stopper 13, and the friction roller 17 and the friction sliding member 1
A slip occurs between 8 and the reverse sled mechanism is activated.
Next, the friction roller 17 is reversely rotated by the reverse rotation of the power transmission unit 6 at the end of recording, the friction sliding unit 18 is rotated counterclockwise, and the operation of the reverse warpage mechanism is released. Reverse sled parts 8
Is rotated counterclockwise, the fan-shaped friction sliding member 1
When the end of 8 (the part where the arc is broken) comes into contact with the friction roller 17, the rotational force is not transmitted from the friction roller 17 to the friction sliding member 18, and the reverse sled component 8 is rotated counterclockwise. It will stop at a fixed amount. According to the present embodiment, since friction transmission is used, the device can be configured without using a relatively expensive gear, torque limiter or the like.

In this embodiment, instead of the inlet guide 9 and the outlet guide 10, R portions 9a and 10a are formed in a part of the recording paper tray 2 as shown in FIG.
The same effect can be obtained even if the reverse R portion 8a is brought into contact with the thermal recording paper 3 between 0a. In FIG. 8, the elastic support member 19
Has been omitted. By doing so, the inlet side guide 9 and the outlet side guide 10 are not required, and there is a cost advantage.

(Fourth Embodiment) In the above-described embodiments, the reverse sled mechanism is operated and released by moving the reverse sled parts. However, the same is true by moving the guide member on the entrance side or the exit side. Can be obtained. 9 and 10 show an example in which such a mechanism is applied to a facsimile machine. The facsimile device mainly includes a recording unit 20, a reading unit 21, an operation panel unit 22 that performs operations such as transmission, reception, and copying, and a control unit 23 that controls the entire device. The recording unit 20 has a structure in which the chassis is shared with the reading unit 21, and the power transmission unit is also shared with the reading unit 21. Therefore, the apparatus can be provided at a low cost, can be adapted to various layouts, and can be readily adapted to a recording / reading facsimile alone.

FIG. 9 shows a state during recording.
In the figure, the pressure contact roller 4 is provided with an inlet side guide support member 24 via a torque limiter 11, and an inlet side guide 9 is attached to the tip of the inlet side guide support member 24. The delivery side guide is not specially provided, and the pressure contact roller 4 is also used. Further, a reverse sled component 25 is attached to the main body of the device, and the reverse R portion 25a thereof is
The heat-sensitive recording paper 3 can be bent.

In the above structure, as the pressure contact roller 4 rotates in the counterclockwise direction, the inlet side guide support member 24 also rotates in the counterclockwise direction, and the inlet side guide 8 is moved to the position shown in FIG. Retained. As a result, the curl removal operation state is set, and the thermal recording paper 3 is decurled.
Next, after the recording is completed, the inlet side guide support member 24 also rotates clockwise along with the clockwise rotation of the pressure contact roller 4, and the inlet side guide 8 is held at the position shown in FIG. As a result, decurling is released. here,
The rotation of the pressure contact roller 4 in the clockwise direction is performed in the cueing operation of the heat sensitive recording paper 3 in which the cut surface is returned to the position immediately before the pressure contact roller 4 after cutting the heat sensitive recording paper 3 with a cutter at the end of recording. There is a feature that no special control is required for the operation and release of the taking mechanism.

Next, a curl removing mechanism for the thermosensitive recording paper 3 by the reverse warp component 8 or 25 in the first to fourth embodiments will be described. The case of the reverse warp component 8 is described here, but the same applies to the case of the reverse warp component 25.

As shown in FIG. 11, the curl removing mechanism for the thermosensitive recording paper 3 by the reverse sled component 8 has a reverse R portion 8a and a reverse R portion 8a for imparting a reverse curvature to the thermosensitive recording paper 3. It comprises an entrance side guide 9 and an exit side guide 10 for giving a winding angle A of 3. When decurling the thermal recording paper 3, the radius of curvature of the guide 9 on the entrance side, the distance B between the guide 9 and the reverse R portion 8a, the radius of curvature of the reverse R portion 8a, The distance C between the R portion 8a and the exit side guide 10, the radius of curvature of the exit side guide 10,
It is determined from the insertion depth D of the reverse R portion 8a with respect to the entrance side guide 9 and the exit side guide 10, the pullout force E, and the magnitude of the conveyance resistance force F due to the frictional force between the thermal recording paper 3 and the recording paper tray 2. It

As an example, the relationship between the radius of curvature of the inverted R portion 8a and the pulling-out force E is shown in FIG. In this figure, the gap B between the entrance side guide 9 and the reverse R part 8a is 10 mm, the gap C between the reverse R part 8a and the exit side guide 10 is 10 mm, the insertion depth D of the reverse R part 8a is 10 mm, and it is roll-shaped. It shows the curl removing effect when the radius of curvature of the inverted R portion 8a is variously changed in a state where the wound thermosensitive recording paper 3 is directly placed on the recording paper tray 2. Here, the curl removal amount of the thermal recording paper 3 is indicated by the curvature, and for the measurement, one side of the thermal recording paper 3 after curling is placed on a table to reduce the friction with the table. This was done by measuring the radius of curvature of the paper 3.

As a result, the radius of curvature of the inverted R portion 8a is 3.5 m.
It was found that when the drawing force E is larger than m, the curl removing effect is small, and when the radius of curvature of the inverted R portion 8a is small, the curling can be performed even if the drawing force E is small. The curl removal mechanism was optimized along with other experimental results, and the radius of curvature of the reverse R portion 8a was 0.5 mm to 3 mm.
When the radius of curvature of the entrance side guide 9 is 0.5 mm to 2 mm, the radius of curvature of the exit side guide 10 is 2 mm to 20 mm, and the winding angle A of the thermosensitive recording paper 3 around the reverse R portion 8a is 40 degrees to 120 degrees, The curvature of the thermal recording paper 3 was ± 0.02 / 1 / mm, and the pulling-out force E was within 15N.

(Fifth Embodiment) FIGS. 13 and 14 show a fifth embodiment of the present invention. The feature of this embodiment is that the reverse sled component 30 whose both ends contact the thermal recording paper 3 is rotatably supported by the upper case 1a. With this structure, tension is applied to the thermosensitive recording paper 3 as the pressure roller 4 rotates during recording as shown in FIG. 13, and the thermosensitive recording paper 3 is stretched flat without slack. Then, the thermal recording paper 3 pushes up the left end side of the reverse sled component 30 upward, whereby the reverse sled component is rotated clockwise, and the reverse R is provided between the inlet side guide 9 and the outlet side guide 10.
The portion 30a presses the thermal recording paper 3 from above, and the curling of the thermal recording paper 3 is possible. At this time, since the supporting point position of the reverse sled component 3 supported by the upper case 1a is offset to the reverse R portion 30a side, the lever principle works and a sufficient force for curling can be obtained. In addition,
The position of the supporting point can be appropriately moved according to the type of the thermal recording paper 3.

When the pressure contact roller 4 is reversed by a predetermined amount as shown in FIG. 14 at the time of non-recording, the thermosensitive recording paper 3 is loosened immediately before the thermosensitive recording head 5, whereby the left end side of the reverse warp component 30 is moved. The reverse R portion 30a is pulled down and rotated in the counterclockwise direction so as to be separated from the thermosensitive recording paper 3, so that the thermosensitive recording paper 3 can be prevented from being bent when not recorded.

In this embodiment, the thermal recording paper 3 of the reverse R portion 30a is used.
The radius of curvature of the portion contacting with 10 mm or more. Further, in the present embodiment, the reverse R portion 30a can always push the thermal recording paper 3, and the reverse R portion 30a can operate as a reverse warp mechanism depending on the amount of rotation of the reverse sled component 30 depending on whether the thermal recording paper 3 is loose or not. , The supporting point position of the reverse sled part 30 to the upper case 1a was determined. Although the core rod 31 is provided on the roll-shaped thermal recording paper 3 in the present embodiment, the core rod 31 can be removed if the capacity of the motor 7 (see FIG. 1) can be increased. The reverse warp mechanism can be operated more effectively by utilizing the conveyance resistance force of the thermal recording paper 3 due to its own weight.

(Sixth Embodiment) FIGS. 15 to 17 show a sixth embodiment of the present invention. In this embodiment, in order to avoid contact between the reverse R portion and the entrance side guide when opening and closing the upper case of the apparatus main body, the entrance side guide support member 32 is part of the apparatus main body (recording paper tray 2 in the figure). Is swingably attached to the inlet side guide support member 32 by a support pin 33.
An entrance side guide 9 is provided. A coil spring 34 is attached to the support pin 33, and the entry side guide support member 32 is biased counterclockwise by the coil spring 34.
Further, the entrance-side guide support member 32 is configured so that the amount of rotation in the clockwise and counterclockwise directions is restricted by a pin (not shown) provided on the apparatus body side. Further, a reverse sled component 35 is attached to the upper case of the apparatus body.

According to the above configuration, when it is not necessary to remove the curl of the thermosensitive recording paper 3, that is, when the roll diameter of the thermosensitive recording paper 3 is large and the curl amount is small, the thermal resistance of the thermosensitive recording paper 3 due to its own weight causes resistance to conveyance. The input side guide 9 is rotated clockwise to reach the state shown in FIG. As a result, the wrap angle of the thermal recording paper 3 around the reverse R portion 35a is reduced, excessive curl removal is suppressed, and at the same time, the carrying load of the thermal recording paper 3 at the reverse R portion 35a can be reduced, so It becomes possible to use the power motor 7 (see FIG. 1). Next, when the roll diameter of the thermosensitive recording paper 3 becomes small and the curl amount becomes large, the entrance side guide 9 rotates counterclockwise as shown in FIG. The curl can be effectively removed by increasing the wrap angle.

When recording is not performed, the pressure contact roller 4 is rotated in the reverse direction so that the inlet side guide 9 and the pressure contact roller 4 are rotated as shown in FIG.
It is possible to avoid the problem that the heat-sensitive recording paper 3 is loosened during the period between and, and the heat-sensitive recording paper 3 is bent due to the reverse warping mechanism in the recording waiting state.

In this embodiment, the pressure guide roller 4 is used as the delivery side guide.
The number of components can be reduced, and the reduction of the number of components has an effect of allowing a large storage space for the thermal recording paper 3.

As an example, FIG. 18 shows the curl removal state when recording is carried out with the thermosensitive recording paper 3 of 30 m roll mounted. The curvature in the figure is measured by the method shown in FIG. Further, the broken line in the drawing shows the recording in the curl removal state when the entrance side guide 9 is fixed to the left side in FIGS. From this result, when the input guide 9 is fixed and the roll diameter of the thermal recording paper 3 is large, an excessive conveyance resistance force F (see FIG. 11) is generated due to the frictional force between the recording paper tray 2 and the thermal recording paper 3. It acts and causes excessive reverse warpage. This state is improved as the roll diameter of the thermal recording paper 3 becomes smaller, but excessive reverse warpage poses a problem in terms of usability.

On the other hand, when the entrance side guide 9 is made movable, curling can be performed substantially uniformly regardless of the roll diameter of the thermosensitive recording paper 3 as shown by the solid line.
Furthermore, by elastically supporting the entrance side guide 9,
It has become possible to prevent image quality deterioration. That is, when the roll-shaped thermal recording paper 3 is placed directly on the recording paper tray 2, the thermal recording paper 3 rotates while climbing the wall of the recording paper tray 2 as the pressure roller 4 rotates. Due to the relationship between the self-weight of No. 3 and the friction coefficient between the recording paper tray 2, dropping onto the bottom of the recording paper tray 2 is repeated. Then, due to this phenomenon, a pulsating conveyance resistance force F that hinders the rotation of the pressure contact roller 4 is applied, and a printing defect due to jitter occurs. However, in this embodiment, the elastically supported entrance side guide 9 absorbs the above-mentioned conveyance resistance force F, so that it is possible to prevent defective printing.

Further, in the apparatus of this embodiment, when the pressure contact roller 4 is not reversed after recording, the thermosensitive recording paper 3 is pressed against and held by the reverse R portion 35a of the reverse warp component 35. At this time, The results of recording after various holding times are shown in FIG. From this, it can be seen that a fold of about 20 degrees occurs after holding for 1 minute after recording, and the fold angle increases as the holding time increases. Therefore, the method of separating the thermal recording paper 3 from the reverse R portion 35a by reversing the pressure roller 4 immediately after recording in this embodiment is very effective in preventing the thermal recording paper 3 from being bent when it is not recorded. is there.

(Seventh Embodiment) FIGS. 20 and 21 show a seventh embodiment of the present invention. The feature of the embodiment shown in FIG. 20 is that the recording paper lower guide 40 is provided in a part of the recording paper tray 2, the recording paper upper guide 41 is provided in the apparatus main body, and the recording paper lower guide 40 has a recess 40a.
The upper part 41 of the recording paper is formed with a convex part 41a that fits into the concave part 40a. And the thermal recording paper 3
Is conveyed between the concave portion 40a and the convex portion 41a while being bent, and then the reverse R is integrally provided on the recording paper upper guide 41.
The curl is removed by the portion 41b.

The feature of the embodiment shown in FIG. 21 is that the recording paper lower guide 42 is provided in a part of the recording paper tray 2, the bent portion 43 is provided at the tip thereof, and the recording paper upper guide 44 is reversed. That is, the R portion 44a is integrally formed. In addition, the bent portion 43 has a conveyance resistance force F of the thermal recording paper 3.
(See FIG. 11) As long as 50 gf to 300 gf can be obtained, the shape is not particularly limited. Also, the reverse R section 4
4a has a radius of curvature of the tip of 0.2 to 1.5 mm and an inverted R portion 44a.
The wrap angle 19 of the heat-sensitive recording paper 3 was 40 degrees to 120 degrees.

Also in the case of FIGS. 20 and 21, the pressure contact roller 4 is reversed when no recording is performed, so that the pressure contact roller 3 is rotated.
It is possible to cause the thermal recording paper 3 to slacken immediately before, and it is possible to prevent a problem that the reverse warping mechanism causes a curl in the recording standby state.

According to these embodiments, when the roll diameter of the thermosensitive recording paper 3 becomes small, the conveyance resistance force F required for removing the curl of the thermosensitive recording paper 3 is generated by the concave portion 40a and the convex portion 41a or the bent portion 43. Since it can be obtained, it is possible to decurl the final end of the thermal recording paper 3.

Further, FIGS. 22 and 23 show that the recording paper lower guide 42 in the embodiment of FIG. 21 is made of an elastic member. That is, the recording paper lower guide 45 is swingably attached to the recording paper tray 2 via the recording paper lower guide support pin 46, and is further pressed upward by the recording paper lower guide elastic support member 47. The mechanism that does not rotate clockwise from the state of FIG. 23 is provided by a rotation stopper (not shown).

With such a structure, when the roll diameter of the thermosensitive recording paper 3 is large, the conveying resistance force F is large, so that the recording paper lower guide 45 moves counterclockwise as shown in FIG. As a result, the winding angle A (see FIG. 11) of the thermal recording paper 3 around the reverse R portion 44a becomes large, and the curl is not removed. However, when the roll diameter of the thermosensitive recording paper 3 becomes smaller, the conveyance resistance F decreases, and the recording paper lower guide elastic support member 47 brings about the state of FIG. As described above, in this embodiment, in addition to the curl removal of the roll core of the thermal recording paper 3, the conveyance resistance force F when the roll diameter is large can be reduced.

(Eighth Embodiment) In the above embodiment, the heat-sensitive recording apparatus using the roll-shaped heat-sensitive recording paper 3 has been described, but the embodiment of the heat-sensitive recording apparatus shown in FIG. 6 is applied to the heat-sensitive transfer recording apparatus. An example is shown in FIG. In this embodiment, the plain paper 50 is wound in a roll shape, and an ink film 51 for supplying ink to the plain paper 50 when the plain paper 50 passes through the thermal recording head 5 is provided. .
Then, the ink film 51 is guided by the supply guide 52 and the winding guide 53. Other configurations are shown in FIG.
Is almost the same as The elastic support member 19 in FIG. 6 is omitted in FIG.

In the above structure, the friction roller 17 is rotated along with the rotation of the power transmission portion during recording, and at the same time, the friction slide member 18 is rotated in conjunction with the rotation of the reverse sled component 8 in the clockwise direction. To do. Then, the reverse warpage component 8 stops at the position of the rotation stop (not shown), slippage occurs between the friction roller 17 and the friction sliding member 18, and the reverse warpage mechanism is activated. Next, the friction roller 17 rotates in the reverse direction due to the reverse rotation of the power transmission unit at the end of recording, and the friction sliding member 18 rotates counterclockwise to release the reverse warping mechanism. When the reverse sled component 8 rotates counterclockwise and the end of the fan-shaped friction sliding member 18 (the portion where the arc is interrupted) comes into contact with the friction roller 17, the friction sliding from the friction roller 17 occurs. The rotational force is not transmitted to the member 18, and the counter-sliding part 8 is automatically stopped from rotating counterclockwise by a predetermined amount. According to this embodiment, the plain paper 50 wound in a roll shape can be decurled.

(Ninth Embodiment) FIGS. 25 and 26 show a ninth embodiment of the present invention. The feature of this embodiment is that the thermal recording paper 3 is rewound before the entrance side guide at the end of recording in order to more reliably remove the crease of the thermal recording paper 3 when unrecorded. That is, in this embodiment, the recording paper tray 2 is provided with an inclination angle 60 as a means for rewinding the thermal recording paper 3, and the thermal recording paper 3 is on the left side of the recording paper tray 2 as shown in FIG. However, the thermal recording paper 3 rolls in the recording paper tray 2 by the reverse rotation of the pressure contact roller 4 after the recording is completed, and moves to the right side of the recording paper tray 2 as shown in FIG. As a result, the thermosensitive recording paper 3 is not only loosened but is also fed back. Then, at the time of next recording, the reverse R portion 35a of the thermosensitive recording paper 3 is reversed again from the front of the portion 61 where the strong crease is formed.
Since it is sent to the portion 35a, there is a feature that the previous breakage point can be corrected. In this embodiment, the inclination angle is 6
Although 0 was set to 20 degrees, the inclination angle 60 was practically effective in the range of 10 degrees to 30 degrees.

[0049]

As described above, according to the present invention,
By utilizing the power transmission system of the pressure contact roller or the tension of the recording paper, it is possible to easily remove the curl of the recording paper and prevent the recording paper from having a reverse curl when not in use.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a thermal recording apparatus according to a first embodiment of the present invention during recording.

FIG. 2 is a longitudinal sectional view of the thermal recording apparatus shown in FIG. 1 when unrecorded.

FIG. 3 is a top view of the thermal recording apparatus shown in FIG. 1 with the upper case removed.

FIG. 4 is a perspective view of a reverse sled component.

FIG. 5 is a longitudinal sectional view of the thermal recording apparatus according to the second embodiment of the present invention during recording.

FIG. 6 is a longitudinal sectional view of the thermal recording apparatus according to the third embodiment of the present invention during recording.

7 is a cross-sectional view taken along the line XX of FIG.

FIG. 8 is a diagram showing a modified example of the thermal recording apparatus of FIG.

FIG. 9 is a longitudinal sectional view of the thermal recording apparatus according to the fourth embodiment of the present invention during recording.

10 is a vertical cross-sectional view of the thermal recording apparatus shown in FIG. 9 when unrecorded.

FIG. 11 is a diagram illustrating details of curl removal by the reverse warpage mechanism.

FIG. 12 is a diagram showing basic characteristics of a reverse sled mechanism.

FIG. 13 is a longitudinal sectional view of the thermal recording apparatus according to the fifth embodiment of the present invention during recording.

14 is a longitudinal sectional view of the thermal recording apparatus shown in FIG. 13 when unrecorded.

FIG. 15 is a vertical cross-sectional view showing a state at the time of recording by the thermal recording apparatus according to the sixth embodiment of the present invention, when there are many thermal recording sheets.

16 is a diagram showing a case where the heat-sensitive recording paper is small as compared with FIG.

FIG. 17 is a longitudinal sectional view of the thermal recording apparatus shown in FIG. 15 when unrecorded.

FIG. 18 is a diagram showing the results of an experiment on decurling of thermal recording paper.

FIG. 19 is a diagram showing an experimental result regarding a crease of a thermal recording paper.

FIG. 20 is a longitudinal sectional view of the thermal recording apparatus according to the seventh embodiment of the present invention during recording.

21 is a diagram showing a modified example of the thermal recording apparatus of FIG.

22 is a vertical cross-sectional view showing another modified example of the heat-sensitive recording apparatus of FIG. 20, when there are many heat-sensitive recording papers.

FIG. 23 is a diagram in the case where the thermal recording paper is small in comparison with FIG. 22.

FIG. 24 is a longitudinal sectional view of the thermal transfer recording apparatus according to the eighth embodiment of the present invention during recording.

FIG. 25 is a longitudinal sectional view of the thermal recording apparatus according to the ninth embodiment of the present invention during recording.

26 is a longitudinal sectional view of the thermal recording apparatus shown in FIG. 25 when unrecorded.

[Explanation of symbols]

1 Case 1a Upper case 1b Lower case 2 Recording paper tray 3 Thermal recording paper 3a Recording part 4 Pressing roller 5 Thermal recording head 6 Power transmission part 7 Motors 8, 25, 30, 35 Reverse sled parts 8a, 25a, 30a, 35a , 41b, 44a Reverse R
Part 9 Inlet guide 10 Outlet guide 11 Torque limiter 12 Upper stopper 13 Lower stopper 14 Chassis 15 Open / close pin 16 Cutter 17 Friction roller 18 Friction sliding member 19 Elastic support member 24, 32 Inlet guide support member 33 Support pin 34 Coil spring 40, 42, 45 Recording paper lower guide 40a Recess 41,44 Recording paper upper guide 41a Convex 43 Bent 46 Recording paper lower guide support pin 47 Recording paper lower guide elastic support member 50 Plain paper 51 Ink film 52 Supply Guide 53 Winding guide

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyasu Sato, 502 Jintamachi, Tsuchiura-shi, Ibaraki Prefecture, Hiritsu Seisakusho Co., Ltd. (72) Inventor, Shogo Matsumoto 502, Kintate-cho, Tsuchiura-shi, Ibaraki, Hitachi, Ltd. Machinery Research Laboratory (72) Inventor Motoo Oga 1410 Inada, Katsuta-shi, Ibaraki Hitachi Information & Video Media Division (72) Inventor Akira Shimizu 1410 Inada, Katsuta-shi, Ibaraki Hitachi, Ltd. Information & Video Media Division (72) Inventor Yoichi Narii 1410 Inada, Katsuta City, Ibaraki Prefecture Hitachi, Ltd. Information & Video Media Division

Claims (17)

[Claims] 1. A thermosensitive recording paper which is rolled into a roll and curled with a certain curvature, a thermosensitive recording head for printing on the thermosensitive recording paper, and the thermosensitive recording paper which is pressed against the thermosensitive recording head and conveyed. A printing roller having a pressing roller for rotating the pressing roller, a power unit for driving the pressing roller to rotate, and a curl removing mechanism for bending the thermal recording paper to an opposite curvature to remove the curl of the thermal recording paper. The printing recording apparatus according to claim 1, further comprising a releasing unit that releases the curl removing operation of the curl removing mechanism with respect to the thermal recording paper at the end of recording. 2. A thermosensitive recording paper wound in a roll shape and curled with a certain curvature, a thermosensitive recording head for printing on the thermosensitive recording paper, and the thermosensitive recording paper being pressed into contact with the thermosensitive recording head and conveyed. A printing roller having a pressing roller for rotating the pressing roller, a power unit for driving the pressing roller to rotate, and a curl removing mechanism for bending the thermal recording paper to an opposite curvature to remove the curl of the thermal recording paper. In the apparatus, after the recording is finished, the curl removal operation of the curl removing mechanism prevents the curl having the opposite curvature from curling, and flattens the first thermosensitive recording paper to be printed next time. An image recording apparatus comprising means. 3. A thermosensitive recording paper which is rolled into a roll and curled with a certain curvature, a thermosensitive recording head for printing on the thermosensitive recording paper, and the thermosensitive recording paper which is pressed against the thermosensitive recording head and conveyed. Pressure roller, a power unit for rotationally driving the pressure roller, two guides for guiding the conveying direction of the thermosensitive recording paper, one end of which is swingably supported and the other end of which is convex. A rod-shaped swing member capable of abutting against the thermal recording paper, and the swing member is rotated in one direction by a driving force from the power unit, thereby swinging the guide member between the guides. In an image recording apparatus for removing the curl of the thermal recording paper by bending the thermal recording paper to the opposite curvature by the convex portion on the end side, at the end of recording, the swing member is rotated in the opposite direction to Equipped with release means to release the curl removal operation on the recording paper Printing recording apparatus characterized by the. 4. The image recording apparatus according to claim 3, wherein the swinging member is detachable from the power unit. 5. A thermosensitive recording paper wound in a roll shape and curled with a certain curvature, a thermosensitive recording head for printing on the thermosensitive recording paper, and the thermosensitive recording paper being pressed into contact with the thermosensitive recording head and conveyed. Pressure contact roller, a power unit for rotationally driving the pressure contact roller, one end of which is swingably attached to the shaft of the pressure contact roller, and the other end of which is provided with a guide for guiding the thermal recording paper. A rod-shaped rocking member, and a fixing member that can come into contact with the thermosensitive recording paper between the pressure roller and the guide and that has a convex portion, and the rocking member is driven by the driving force from the power unit. By rotating in one direction, the convex portion of the fixing member between the pressure roller and the guide presses the thermosensitive recording paper to an opposite curvature to remove the curl of the thermosensitive recording paper. At the end of recording,
An image recording apparatus comprising: a releasing unit that rotates the swing member in a reverse direction to release a curl removing operation on the thermal recording sheet. 6. The image recording apparatus according to claim 3, wherein the swinging member transmits the driving force from the power unit via a gear or a friction roller. 7. A thermosensitive recording paper wound in a roll shape and curled with a certain curvature, a thermosensitive recording head for printing on the thermosensitive recording paper, and the thermosensitive recording paper being pressed into contact with the thermosensitive recording head and conveyed. Pressure contact roller, a power unit for rotationally driving the pressure contact roller, at least two guide members for guiding the conveying direction of the thermal recording paper, and an intermediate portion swingably supported, and both ends thereof. Includes a rod-shaped rocking member capable of contacting the heat-sensitive recording paper, and by pushing up one end side of the rocking member by the tension of the heat-sensitive recording paper, the rocking member on the other end side is moved between the guide members. In a print recording apparatus in which a convex portion presses the thermosensitive recording paper to an opposite curvature to remove the curl of the thermosensitive recording paper, at the end of recording, the pressure contact roller is reversed to allow the thermosensitive recording paper to have slack. The other end of the swing member The convex portion is detached from the heat-sensitive recording paper, printing recording apparatus characterized by comprising a releasing means for releasing the operation of removing curl for thermosensitive recording paper. 8. A thermosensitive recording paper wound in a roll shape and curled with a certain curvature, a thermosensitive recording head for printing on the thermosensitive recording paper, and the thermosensitive recording paper being pressed into contact with the thermosensitive recording head and conveyed. Pressure contact roller, a power unit for rotationally driving the pressure contact roller, and a rod-shaped rocking member having one end swingably supported and the other end provided with a guide for guiding the thermosensitive recording paper. A fixing member which is capable of contacting the thermosensitive recording paper between the pressure contact roller and the guide and has a convex portion, and the other end of the swinging member is moved according to the roll diameter of the thermosensitive recording paper. Thus, the print recording is provided with a swinging member driving means for removing the curl of the thermosensitive recording paper by bending the thermosensitive recording paper to the opposite curvature by the convex portion of the fixing member between the pressure contact roller and the guide. In the device, reverse the pressure contact roller at the end of recording. The heat-sensitive recording paper is provided with a slack so that the heat-sensitive recording paper is detached from the convex portion of the fixing member, and the heat-sensitive recording paper is provided with a releasing means for releasing the curl removing operation. Print recording device. 9. The image recording apparatus according to claim 3, 5, 7, or 8, wherein the rocking range of the rocking member is set to a predetermined range. . 10. A thermosensitive recording paper which is rolled into a roll and curled with a certain curvature, a thermosensitive recording head for printing on the thermosensitive recording paper, and the thermosensitive recording paper being pressed against the thermosensitive recording head and conveyed. Pressure roller, a power unit for rotationally driving the pressure roller, and a bending portion for sandwiching the thermosensitive recording paper from both sides to guide the conveying direction and bending the thermosensitive recording paper at the time of conveyance. And a fixing member for removing a curl of the heat-sensitive recording paper by bending the heat-sensitive recording paper into a reverse curvature by a convex portion between the guide member and the pressure roller, By providing the slack in the thermosensitive recording paper by reversing the pressure contact roller, the thermosensitive recording paper is detached from the convex portion of the fixing member, and the releasing means for releasing the curl removing operation for the thermosensitive recording paper is provided. Printing recording apparatus characterized by the. 11. The image recording apparatus according to claim 10, wherein the guide member is provided with adjusting means for adjusting a degree of bending. 12. The image recording apparatus according to claim 3, 5, 7, 8 or 10, wherein the radius of curvature is 0.5 mm from the other end side of the swinging member or the tip of the convex portion of the fixing member. An image recording apparatus having a thickness of 3 mm, preferably 1 mm to 2 mm. 13. The image recording apparatus according to claim 3, 5, 7, or 8, wherein a guide of the thermal recording paper in the conveyance direction of the guides is a conveyance direction of the thermal recording paper at the time of recording. Above, 2 mm to 10 mm from the other end of the swing member or the center position of the convex portion of the fixed member.
It is installed at the position of mm and the radius of curvature is from 0.5 mm to 2 mm.
A print recording apparatus characterized by being formed in a. 14. The image recording apparatus according to claim 3, wherein a guide of the guides on the delivery side of the thermal recording paper in the transport direction is the swinging member in the transport direction of the thermal recording paper during recording. An image recording apparatus, which is provided at a position of 2 mm to 50 mm from the center position of the convex portion on the other end side and has a radius of curvature of 2 mm to 20 mm. 15. The print recording apparatus according to claim 3, 5, 7, 8, or 10, wherein a wrap angle of the other end side of the swinging member or the tip of the convex portion of the fixing member with respect to the thermosensitive recording paper. Is set to 40 to 120 degrees, preferably 60 to 100 degrees during recording, and 120 to 180 degrees during non-recording. 16. A thermal recording head for rolling a roll of recording paper curled with a certain curvature, an ink film having an ink layer, and melting and transferring the ink layer of the ink film onto the recording paper for printing. A pressure contact roller that conveys the recording paper and the ink film in pressure contact with the thermal recording head, and a power unit that rotationally drives the pressure contact roller.
A curl removing mechanism for removing the curl of the recording paper by bending the recording paper to the opposite curvature, and releasing the curl removing operation for the recording paper by the curl removing mechanism at the end of recording. An image recording apparatus, comprising: a releasing unit for canceling. 17. A printing recording device for removing a curl of a thermosensitive recording paper by curving the thermosensitive recording paper in an opposite curvature when printing on a thermosensitive recording paper which is wound in a roll shape and curled with a certain curvature. A curl removing method for a print recording apparatus, wherein the curl removing operation is canceled at the end of recording.