JP3491524B2 - Thermal line printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [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 and a measuring device. 2. Description of the Related Art Japanese Patent Application Laid-Open No. 5-58526 discloses a device which has been proposed as a curling 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 device" according to the above publication. In FIG. 5, reference numeral 101 denotes a roll-shaped 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 that presses in the direction opposite to the direction of projection of a, 106 is a spring member that holds the pressing member 105, and 107 is a rear end 10
7a, the roll-shaped recording paper 10 slidably in contact with the wall 102a
1 is a pressing member that enables pressing and abuts the leading end portion 107b against the outer peripheral portion 101a of the roll-shaped recording paper 101. A description will now be given of the curl removal of the roll-shaped recording paper 101 of the conventional roll paper decurling apparatus configured as described above. [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.) On the recording paper discharge side of the recording paper storage unit 102, there is provided a wall portion 102a projecting over the entire width of the recording paper.
The rolled recording paper 101 that is rewound and discharged is the wall 1
02a is carried out 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 by the wall portion 102a and the wall portion 102.
and a pressing member 105 provided between the recording paper part a and the outer peripheral part of the rolled recording paper 101 and held by a spring member 106 capable of pressing the rolled recording paper 101 slidably in 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 figure, and protrudes on the path of the roll-shaped recording paper 101 in a 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. Moreover, 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, so that even if the curl has a strong curl, good curl can be obtained. Things. However, in recent years, with the miniaturization of equipment, the diameter of the platen roller has been decreasing.
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 curl of the roll-shaped recording paper that has passed through the recording section is likely to occur. In recent years, systems for optically reading printed receipts have emerged. For fast and accurate reading, printed receipts must not have a curl habit. The curl removing device removes the curl before the roll-shaped recording paper reaches the recording section, and cannot remove the curl generated by passing through the recording section 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 habit generated on a recording sheet on which printing is performed and ejecting the paper and issuing a printed receipt without the curl habit. [0013] In order 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 rotation of the platen roller. A driving unit, a line-type thermal head, 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 A curl correcting member for correcting the discharge direction of the recording paper by bringing the recording paper printed by the line-type thermal 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 which is printed and discharged and issuing a printed receipt without the curl. 1 is a perspective view of a thermal line printer according to the present invention;
A platen roller pivotally supported by
Rotating drive means, a line-type thermal head,
Head support member for holding the thermal head
Paper and the line type thermal head
Elastic contact with the platen roller via the recording paper
And the body printed with the line type thermal head.
Roll recording paper in contact with the roll-shaped recording paper
A curl straightening member for correcting the orientation,
The other end is in contact with the curl correcting member while the outer
As the roll diameter of the roll-shaped recording paper decreases,
Roll diameter detecting lever for moving the curl correcting member in parallel
Roll-shaped record that is printed and discharged
Curl that increases as the roll diameter decreases on the recording paper
If the effect of correcting the habit is increased and the correction can be performed automatically
It has the effect. An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. (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 section, 4 denotes a thermal head, and 5 denotes a roll-shaped recording paper 2 by a thermal head 4.
A platen roller (not shown for rotating the platen roller 5) for feeding the paper while pressing the paper, a head support member 6, and a thermal head 4 to the platen roller 5 via the roll-shaped recording paper 2. The 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 by 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 being printed. 2 is sent in the discharge direction. The curl of the rolled recording paper 2 on which the printing is performed is more severe than before the printing is performed. As shown in the drawing, the curl is discharged in a clockwise direction. The roll-shaped recording paper 2 comes into contact with the curl correction surface 8a, is corrected in the counterclockwise direction, and is discharged upward. As described above, according to the first embodiment, the curl of the rolled recording paper is corrected 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 has been described as being upward. However, 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 wound outside (the name of the roll paper winding method in which the recording surface is formed outside the roll) is 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 the roll-shaped recording paper 2 is wound inward. By providing the curl correcting member 8 with the R-shaped portion 8c, even if the inner rolled recording paper 2 is rewound, it is smoothly conveyed to the recording unit. The curl existing on the roll-shaped recording paper 2 before reaching the recording unit is in a counterclockwise direction, and a part of the curl is already corrected by passing through the recording unit. For this reason, it is necessary to reduce the curl correcting effect by making a part of the curl correcting front surface 8a of the curl correcting member 8 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 is omitted.
, A roll diameter detection lever having a cam-shaped portion 9a so that the curl correction member 8 can be rotated as the roll diameter of the roll-shaped recording paper 2 decreases as the other end contacts the curl correction 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 detection 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. As the lift increases, the curl correction member 8 rotates counterclockwise in the figure with its 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 so that the curl correcting member 8 can be moved in parallel with the decrease in the roll diameter of the rolled recording paper 2 so as to detect the roll diameter. A 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 detecting lever 10 has a cam-shaped portion 10a and is in contact with the curl correcting member 8, so that the roll-shaped detecting lever 10 rotates clockwise to lift the cam-shaped portion. As the amount increases, the curl correcting member 8 moves 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 surface 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 of the printed roll-shaped recording paper 2 is corrected at a position closer to the pressure contact point 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. 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 discharging direction of the recording paper, and The curl correcting member is rotated or rotated in parallel with the rotation of the diameter detecting lever, and the curl correcting effect is increased so as to increase the curl correcting effect. In a system for optically reading the image, an advantageous effect is obtained that not only can the image be read quickly and accurately, but also the curl habit that increases as the roll diameter decreases can be automatically corrected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-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. FIG. 4 is a schematic cross-sectional view of a thermal line printer according to the third embodiment. FIG. 5 is a schematic cross-sectional view of a conventional thermal line printer. [Description of References] 1 Main body chassis 1a Guide groove 2 Roll-shaped recording Paper 2a Outer peripheral portion 3 Recording paper storage unit 4 Thermal head 5 Platen roller 6 Head support member 7 Elastic body 8 Curl correcting member 8a Curling correcting surface 8b Guide boss 8c, 8d R-shaped portion C8 Center of rotation 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 Roll diameter detection lever Rotation center

Continuation of front page (72) Inventor Satoshi Yamaura 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (56) References JP-A-62-16969 (JP, A) JP-A-4-55255 (JP) , A) Hikaru 4-109952 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 23/34 B41J 2/325 B41J 15/16

Claims (1)

(57) [Claim 1] 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 the line type A head support member for holding a 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 print that is printed by the line-type thermal head. A curl correcting member that abuts the roll-shaped recording paper to correct the discharge direction of the roll-shaped recording paper, and one of which abuts against the outer peripheral portion of the roll-shaped recording paper and the other end thereof contacts the curl-correcting member. A thermal line printer comprising a roll diameter detection lever for moving the curl correcting member in parallel with a decrease in the roll diameter of the rolled recording paper