JPH11322149A - Thermal line printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically correct a curling tendency of recording paper by bringing a line type thermal head into pressure contact with a platen roller via the recording paper by means of an elastic body and bringing the recording paper printed by the line type thermal head into contact by means of a curl correcting member so as to correct the recording paper ejection direction. SOLUTION: Rolled recording paper 2 stored in a recording paper housing unit 3 is unwound so as to be led between a thermal head 4 and a platen roller 5 with its curling tendency maintained. The rolled recording paper 2 put between the thermal head 4 and the platen roller 5 is pressed to the thermal head 4 by means of a pressure of an elastic body 7. The printed rolled recording paper 2, which is curled further in comparison with itself before printing, is discharged while curled clockwise. This curled paper is brought into contact with a curl correcting face 8a in a curl correcting member 8, and the rolled recording paper 2 is corrected counterclockwise and discharged upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a thermal line printer used as an output terminal of a POS, an ECR, a handy terminal or a measuring device.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 5-58526 discloses a curl correction device for roll-shaped recording paper.
There is an official gazette.

FIG. 5 is a schematic sectional view showing the structure of a "roll paper curling apparatus" according to the above publication.

In FIG. 5, reference numeral 101 denotes a roll of recording paper,
02 is a recording paper storage unit, 102a is a wall protruding from the recording paper discharge side, 103 is a thermal head, 104 is a platen roller for feeding the roll-shaped recording paper 101 while pressing it against the thermal head 103, and 105 is The roll-shaped recording paper 101 discharged in sliding contact with the wall 102a is
a pressing member for pressing in a direction opposite to the protruding direction of a, a spring member for holding the pressing member 105, and a rear end portion 107 for the pressing member 105.
7a, the roll-shaped recording paper 10 slidably in contact with the wall 102a
1 is a pressing member that allows pressing and abuts the leading end portion 107b against the outer peripheral portion 101a of the roll-shaped recording paper 101.

A description will be given of the curl removal of the roll-shaped recording paper 101 of the conventional roll paper curl removing device having the above-described configuration.

[0006] The roll-shaped recording paper 101 is stored in the recording paper storage unit 102 such that the paper winding direction is clockwise in the figure (in the direction of the arrow in the figure, the roll-shaped recording paper is rewound and discharged). Counter-clockwise direction).

A recording paper discharge side of the recording paper storage unit 102 is provided with a wall 102a protruding over the entire width of the recording paper.
The roll-shaped recording paper 101 that is rewound and discharged is the wall 1
02a to the recording section.

The recording section includes a thermal head 103 and a platen roller 104. The roll-shaped recording paper 101 discharged from the recording paper storage section 102 is a platen roller 104.
Is pressed by the thermal head 103 and heated by the thermal head 103 to perform dot printing.

The printed roll-shaped recording paper 101 is discharged from the recording section to the left in FIG. 5 by the rotation of the platen roller 104. The roll-shaped recording paper 101 has a curl in the direction in which it is wound.
1 is configured to be removed before reaching the recording unit. That is, the curl removal is performed on the wall portion 102a and the wall portion 102.
and a pressing member 105 provided between the recording paper portion a and the recording member 101. The pressing member 105 is held by a spring member 106 capable of pressing the recording paper sheet 101, which is in contact with the outer peripheral portion of the recording paper sheet 101 and is in sliding contact with the wall 102a. The pressing is performed by the pressing member 107.

The pressing member 105 is, for example, a leaf spring bent in a J-shape as shown in the drawing, and protrudes on the path of the roll-shaped recording paper 101 in the direction opposite to the direction in which the wall portion 102a protrudes. The roll-shaped recording paper 101 discharged in sliding contact with 102a is pressed in a direction opposite to the curl habit to bend and curl. In addition, the pressing member 107 and the spring member 10
Due to the effect of 6, when the outer diameter of the roll-shaped recording paper 101 is reduced, the tension of the roll-shaped recording paper 101 between the wall portion 102a and the platen roller 104 is increased, and even if the curl has a strong curl, good curl can be obtained. Things.

[0011]

However, in recent years, the platen roller has been reduced in diameter along with the miniaturization of equipment.
Rolled recording paper fed by a small-diameter platen roller has a stronger curl habit, and the printing surface of the rolled recording paper is heated by the principle of a thermal line printer. Since the side expands thermally, the roll-shaped recording paper that has passed through the recording section tends to have a curl tendency. In recent years, systems for optically reading printed receipts have emerged. In order to quickly and accurately read printed receipts, the printed receipts must not have a curl habit. The curl removing device removes the curl before the roll-shaped recording paper reaches the recording portion, and cannot remove the curl generated by passing through the recording portion as described above. have.

The present invention solves such a conventional problem,
It is an object of the present invention to provide a thermal line printer capable of removing a curl generated on a recording paper printed and discharged and issuing a printed receipt without the curl.

[0013]

To solve this problem, a thermal line printer according to the present invention comprises: a platen roller rotatably supported by a chassis of a thermal line printer main body; and a driving means for rotating the platen roller. A line-type thermal head, a head supporting member for holding the line-type thermal head, a recording paper, an elastic body for pressing the line-type thermal head against the platen roller via the recording paper, and the line-type thermal head. And a curl correcting member for correcting the discharge direction of the recording paper by bringing the recording paper printed by a head into contact with the curl correcting member.

According to this configuration, it is possible to obtain a thermal line printer capable of removing the curl generated on the recording paper that is printed and discharged, and issuing a printed receipt without the curl.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to a first aspect of the present invention is directed to a platen roller rotatably supported on a chassis of a thermal line printer main body, a rotation driving means for the platen roller, and a line type thermal head. A head support member for holding the line-type thermal head, a recording sheet, an elastic body for pressing the line-type thermal head against the platen roller via the recording sheet, and printing by the line-type thermal head. Since the recording paper is configured to have a curl correcting member that makes contact with the recording paper to correct the discharge direction of the recording paper, it has an effect that a curl generated on the recording paper that is printed and discharged can be removed.

According to a second aspect of the present invention, there is provided a platen roller rotatably supported on a chassis of a thermal line printer main body, rotation driving means for the platen roller, a line type thermal head, and a line type thermal head. A head support member for holding the thermal head, a roll-shaped recording paper, an elastic body that presses the line-type thermal head against the platen roller via the roll-shaped recording paper, and printing is performed by the line-type thermal head. A curl correcting member for abutting the roll-shaped recording paper to correct the discharge direction of the roll-shaped recording paper; and a curling correcting member for making one abut on the outer peripheral portion of the roll-shaped recording paper and bringing the other end into contact with the curl correcting member. Since the roll-shaped recording paper is constituted by a roll diameter detection lever that rotates the curl correcting member with a decrease in the roll diameter of the recording paper, printing is performed. To increase the effect of correcting curling habit which becomes stronger with decreasing roll diameter occurring rolled recording paper is discharged, and has an effect of correction can automatically.

According to a third aspect of the present invention, there is provided a platen roller rotatably supported on a chassis of a thermal line printer main body, rotation driving means for the platen roller, a line type thermal head, A head support member for holding the thermal head, a roll-shaped recording paper, an elastic body that presses the line-type thermal head against the platen roller via the roll-shaped recording paper, and printing is performed by the line-type thermal head. A curl correcting member for correcting the discharge direction of the roll-shaped recording paper by bringing the roll-shaped recording paper into contact with the curl-correcting member; And a roll diameter detection lever that translates the curl correcting member in parallel with a decrease in the roll diameter of the rolled recording paper. Made to increase the effect of correcting curling habit strongly with decreasing roll diameter occurring rolled recording paper discharged Te, and the correction has the effect that it automatically.

An embodiment of the present invention will be described below with reference to FIGS. (First Embodiment) FIG. 1 is a schematic sectional view of a thermal line printer according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a main body chassis of a printer, 2 denotes roll-shaped recording paper, 3 denotes a recording paper storage, 4 denotes a thermal head, and 5 denotes a roll-shaped recording paper 2 by a thermal head 4.
Roller for feeding the paper while pressing the platen (rotation driving means of the platen roller 5 is not shown), 6 is a head supporting member, and 7 is the thermal head 4 to the platen roller 5 via the roll-shaped recording paper 2. An elastic body 8 to be pressed is a curl correcting member that changes the discharge direction of the roll-shaped recording paper 2 by bringing the roll-shaped recording paper 2 printed by the thermal head 4 into contact.

The operation of the embodiment will be described below with reference to FIG. The roll-shaped recording paper 2 stored in the recording paper storage unit 3 is rewound (indicated by an arrow in the drawing) and guided between the thermal head 4 and the platen roller 5 while maintaining a curl habit. I will The roll-shaped recording paper 2 sandwiched between the thermal head 4 and the platen roller 5 is pressed against the thermal head 4 by the pressure of the elastic body 7. By controlling the timing of energizing the thermal head 4 and energizing the motor which is the driving source of the rotation driving means (not shown) of the platen roller 5, the printing is performed on the rolled recording paper 2 while the rolled recording paper 2 is printed. 2 is sent in the discharge direction. The curl of the rolled recording paper 2 on which the printing has been performed is in a more severe state than before the printing is performed, and is curled clockwise as shown in the drawing, and is discharged. The roll-shaped recording paper 2 abuts against the curl correction surface 8a, is corrected in a counterclockwise direction, and is discharged upward.

As described above, according to the first embodiment, the curl correction of the rolled recording paper is performed after the printing on the rolled recording paper, so that a printed receipt without curl can be obtained. In a system for optically reading contents, advantageous effects such as quick and accurate reading can be obtained.

In the present embodiment, the discharge direction of the roll-shaped recording paper 2 is described as being upward, but an optimum curl correction amount is required depending on the diameter of the platen roller 5 used and the position of the curl correction front surface 8a. Therefore, the discharge direction of the roll-shaped recording paper 2 is not limited to the upward direction.

In the description, a roll-shaped recording paper is used. However, the present invention is not limited to the roll-shaped recording paper, and the curl correction after the printing of the cut-shaped recording paper can be more effective than the roll-shaped recording paper.

In the present embodiment, the case where the roll-shaped recording paper is externally wound (the name of the roll paper winding method in which the recording surface is formed outside the roll) has been described. It is also possible to use the case where the recording surface is a roll paper winding method formed inside the roll).
This will be briefly described with reference to FIG.

In FIG. 2, the difference from FIG. 1 is that the curl correction member 8 is provided with R-shaped portions 8c and 8d, and that the roll-shaped recording paper 2 is wound inward.

By providing the R-shaped portion 8c on the curl correcting member 8, even if the inner rolled recording paper 2 is rewound, it is smoothly conveyed to the recording unit. The curl existing in the roll-shaped recording paper 2 before reaching the recording section is in the counterclockwise direction, and a part of the curl has already been corrected by passing through the recording section. For this reason, it is necessary to reduce the curl correcting effect by forming a part of the curl correcting front surface 8a of the curl correcting member 8 as an R-shaped portion 8d. By providing the R-shaped portions 8c and 8d in the curl correcting member 8 as described above, the same effect can be obtained for the inner-wound roll-shaped recording paper 2 as for the outer-wound roll paper.

(Embodiment 2) FIG. 3 is a schematic sectional view of a thermal line printer according to a second embodiment of the present invention.

In FIG. 3, the description of the same reference numerals as those in FIG. 1 will be omitted.
A roll diameter detecting lever having a cam-shaped portion 9a so that the curl correcting member 8 can be rotated as the roll diameter of the roll-shaped recording paper 2 decreases with the other end contacting the curl correcting member 8; C8 is the rotation center of the curl correction member 8, and C9 is the rotation center of the roll diameter detection lever 9.

The operation of the embodiment will be described below with reference to FIG. Regarding the operation to correct the curl of the rolled recording paper after printing on the rolled recording paper,
Although the description is omitted because it is the same as that of the first embodiment, the roll diameter of the roll-shaped recording paper 2 gradually decreases as the roll-shaped recording paper 2 is used. One of the roll diameter detecting levers 9 is urged by a spring force of a spring material (not shown) so as to contact the outer peripheral portion 2a of the roll-shaped recording paper 2, so that the roll diameter of the roll-shaped recording paper 2 is small. With this, the roll diameter detection lever 9 rotates clockwise in the figure with its rotation center C9 as the center of rotation. The other end of the roll diameter detection lever 9 has a cam-shaped portion 9a and is in contact with the curl correcting member 8, so that the rotation of the roll diameter detection lever 9 in the clockwise direction causes the cam-shaped portion 9a to rotate. The lift amount increases, and the curl correction member 8 rotates counterclockwise in the figure with the rotation center C8 as the center of rotation.

When the curl correcting member 8 rotates in the counterclockwise direction, the curl correcting surface 8a also rotates by the same amount, and the discharge direction of the recording paper 2 changes slightly from the upper left to the lower left. Is large, and the curl habit that becomes strong as the roll diameter becomes small can be sufficiently corrected.

As described above, according to the second embodiment, since the curl of the roll-shaped recording paper is corrected after printing on the roll-shaped recording paper, a printed receipt without curl can be obtained. Not only can be obtained, but also a curl habit that becomes stronger as the roll diameter decreases can be automatically corrected.

In the present embodiment, the example in which the other end of the roll diameter detecting lever 9 has a cam shape has been described. However, similar effects can be obtained by applying gear meshing or a link mechanism. Needless to say.

(Embodiment 3) FIG. 4 is a schematic sectional view of a thermal line printer according to a third embodiment of the present invention.

In FIG. 4, the description of the same reference numerals as those in FIG. 1 will be omitted.
a, the other end of which comes into contact with the curl correcting member 8 and has a cam-shaped portion 10a so that the curl correcting member 8 can be translated in parallel with the decrease in the roll diameter of the rolled recording paper 2. Lever, 1a is a guide groove provided in the main body chassis 1, 8b is a guide boss provided in the curl correcting member 8, and C10 is a rotation center of the roll diameter detection lever 10.

The operation of the embodiment will be described below with reference to FIG. Regarding the operation to correct the curl of the rolled recording paper after printing on the rolled recording paper,
Although the description is omitted because it is the same as that of the first embodiment, the roll diameter of the roll-shaped recording paper 2 gradually decreases as the roll-shaped recording paper 2 is used. One of the roll diameter detecting levers 10 is urged by a spring force of a spring material (not shown) so as to contact the outer peripheral portion 2a of the roll-shaped recording paper 2, so that the roll diameter of the roll-shaped recording paper 2 is small. As the roll diameter detecting lever 10 has its center of rotation as its center of rotation, the roll diameter detecting lever 10 rotates its center of rotation C10 as the roll diameter of the rolled recording paper 2 decreases. It rotates clockwise in the figure as the center. The other end of the roll diameter detection lever 10 has a cam-shaped portion 10a and is in contact with the curl correcting member 8, so that the rotation of the roll diameter detection lever 10 in the clockwise direction causes the lift of the cam-shaped portion. As the amount increases, the curl correcting member 8 translates to the left in the drawing along the guide groove 1a. When the curl correcting member 8 moves parallel to the left in the figure, the curl correcting front 8a also moves parallel by the same amount, and the discharge position of the roll-shaped recording paper 2 moves to the left as shown in the figure. That is, since the curl habit of the printed roll-shaped recording paper 2 is corrected at a position closer to the pressure contact between the platen roller 5 and the thermal head 4, the effect of correcting the curl of the roll-shaped recording paper 2 is increased, and the roll diameter is reduced. It is possible to sufficiently correct a curl habit that becomes strong as the diameter becomes smaller.

As described above, according to the third embodiment, since the curl of the roll-shaped recording paper is corrected after printing on the roll-shaped recording paper, a printed receipt without curl can be obtained. Not only can be obtained, but also a curl habit that becomes stronger as the roll diameter decreases can be automatically corrected.

[0037]

As described above, in the thermal line printer according to the present invention, the printed recording paper is brought into contact with the curl correcting member to change the discharge direction of the recording paper, and the roll diameter detecting lever is used. The curl correcting member is rotated with the rotation, or the curl correcting effect is increased by moving the curl correcting member in parallel, so that a printed receipt without curl can be obtained, and the printed contents can be optically printed. An advantage of the present invention is that not only can the system read quickly and accurately, but also it is possible to automatically correct a curl habit that becomes stronger as the roll diameter decreases.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a thermal line printer according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of another configuration.

FIG. 3 is a schematic sectional view of a thermal line printer according to the second embodiment.

FIG. 4 is a schematic sectional view of a thermal line printer according to the third embodiment.

FIG. 5 is a schematic sectional view of a conventional thermal line printer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body chassis 1a Guide groove 2 Roll-shaped recording paper 2a Outer perimeter 3 Recording paper storage part 4 Thermal head 5 Platen roller 6 Head support member 7 Elastic body 8 Curl straightening member 8a Curl straightening face 8b Guide boss 8c, 8d R shape part C8 Rotation center of curl correcting member 9 Roll diameter detection lever 9a Cam-shaped part C9 Rotation center of roll diameter detection lever 10 Roll diameter detection lever 10a Cam-shaped part C10 Rotation center of roll diameter detection lever

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Yamaura 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A platen roller rotatably supported by a chassis of a thermal line printer main body, rotation driving means for the platen roller, a line type thermal head, and a head support member for holding the line type thermal head. A recording sheet, an elastic body that presses the line-type thermal head against the platen roller via the recording sheet, and the recording sheet printed by the line-type thermal head, and a discharge direction of the recording sheet. Thermal line printer composed of a curl correction member that corrects the image. 2. A platen roller rotatably supported by a chassis of a thermal line printer main body, rotation driving means for the platen roller, a line type thermal head, and a head support member for holding the line type thermal head. A roll-shaped recording paper, an elastic body that presses the line-type thermal head against the platen roller via the roll-shaped recording paper, and the roll-shaped recording paper printed by the line-type thermal head are brought into contact with each other. A curl correcting member for correcting the discharge direction of the roll-shaped recording paper; A thermal line printer comprising: a roll diameter detection lever for rotating the curl correcting member as the curl decreases. 3. A platen roller rotatably supported by a chassis of a thermal line printer main body, rotation driving means for the platen roller, a line type thermal head, and a head support member for holding the line type thermal head. A roll-shaped recording paper, an elastic body that presses the line-type thermal head against the platen roller via the roll-shaped recording paper, and the roll-shaped recording paper printed by the line-type thermal head are brought into contact with each other. A curl correcting member for correcting the discharge direction of the roll-shaped recording paper; A thermal line printer comprising: a roll diameter detection lever that translates the curl correcting member in parallel with the decrease.