JP2012131088A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer uniformly applying a pressure suited for printing to printing paper having a first sheet and a second sheet superposed on the first sheet with a gap by a simple configuration.SOLUTION: The printer 1 includes a transporting part 3 transporting the printing paper having the first sheet 50 and the second sheet 51 superposed on the first sheet 50 with the gap 58, and a printing part 5 performing printing on the printing paper. The printing part 5 has a thermal head 18, and a platen roller 17 disposed in opposition to the thermal head 18. The platen roller 17 has a shaft 30 rotatably supporting it in a direction intersecting with a transporting direction of the printing paper, a columnar body roller 31 disposed on the shaft 30, and an protrusion part 32 protruding in a radially outward direction of the body roller 31 to press a gap 58 part of the printing paper to fill the gap 58.

Description

  The present invention relates to a printer and a platen roller for a printer, and more particularly to a printer and a platen roller for a printer for applying an appropriate pressure to printing on printing paper.

Conventionally, an adhesive and a release agent are formed on the back surface of the first sheet and the second sheet, and alternately formed at positions where the adhesive of one sheet and the release agent of the other sheet are temporarily attached, and both sheets are polymerized. A continuous double-sided label without a backing is known.

  When the above-mentioned double-sided label continuous body without a mount is printed by being pressed and sandwiched by a platen roller and a thermal head, the adhesive extends due to the pressing and adheres to the adjacent adhesive or the other sheet, label There are problems such as sticking out of the outer edge of the adhesive. In order to prevent such a problem, a double-sided label continuous body having a gap between the adhesives arranged next to each other is used.

  FIG. 7 shows a direction orthogonal to the transfer direction when the double-sided label continuous body L in which the adhesives 52 are arranged with a predetermined gap 58 is pressed between the platen roller 59 and the thermal head 60 and printed and transferred. FIG. The double-sided label continuous body L includes a first sheet 50, a second sheet 51, an adhesive 52, and a release agent 53. The first sheet 50 includes a first coloring layer 54 and a first base material 55, and the back surface of the first coloring layer 54 and the surface of the first base material 55 are bonded. The second sheet 51 includes a second coloring layer 56 and a second base material 57, and the back surface of the second coloring layer 56 and the surface of the second base material 57 are bonded in the same manner as the first sheet 50. . On the back surfaces of the first substrate 55 and the second substrate 57, the adhesive 52 and the release agent 53 are alternately applied in a line parallel to the transfer direction, and the adhesive 52 of one sheet is applied to the other. It is temporarily attached to the release agent 53. The width G orthogonal to the application direction of the adhesive 52 is set to be smaller than that of the release agent 53, and when temporarily attached, the width G is arranged via a gap 58 having a width H orthogonal to the application direction. It is supposed to be. The application thickness I of the adhesive 52 is thicker than the application thickness of the release agent 53, and even if the adhesive 52 spreads by being pressed by the platen roller 59 and the thermal head 60, it does not adhere to the adjacent adhesive 52. ing.

  However, when printing is performed on the double-sided label continuum L having the gap 58, an appropriate pressing force is applied to the portion of the color developing layer to be printed that is pressed against the platen roller 59 through the gap 58. There is a problem in that since the heat generated by the thermal head 60 is not transmitted to the color forming layer, printing is not performed in that portion, and printing accuracy is lowered.

JP 2005-272623 A

  The present invention has been made in view of such problems, and printing is performed by filling a gap between a first sheet and a printing sheet having a second sheet obtained by polymerizing the first sheet with a gap. It is an object of the present invention to provide a printer and a platen roller for a printer that can apply pressure suitable for the above.

The present invention relates to a printer having a platen roller having a main body roller provided with a projecting portion projecting radially outward. The gist of the first invention is that the first sheet and a gap are formed in the first sheet. A printer having a transfer unit capable of transferring printing paper having a second sheet superposed and a printing unit for printing the printing paper, the printing unit comprising: a thermal head; and A platen roller disposed opposite to the platen roller, the platen roller being rotatably supported in a direction intersecting the printing paper transport direction, a columnar body roller disposed on the shaft, and the body roller And a protruding portion that protrudes radially outward and presses a gap portion of the printing paper to fill the gap.
The printing unit is located upstream in the transfer direction of the printing paper, and a first thermal head that performs printing on the first surface of the printing paper, and a first thermal head that is disposed opposite to the first thermal head. A platen roller, a second thermal head that is located downstream of the printing paper in the transfer direction and that prints on the second surface of the printing paper, and a second platen roller that is disposed opposite to the second thermal head, , May be configured.
The platen roller is disposed between a shaft supported rotatably in a direction intersecting the printing paper transport direction, a plurality of cylindrical body rollers disposed on the shaft, and the body roller. A protruding roller that protrudes outward in the radial direction of the roller and presses the gap portion of the printing paper to fill the gap may be used.

  According to the printer and the platen roller for a printer of the present invention, when printing on a printing paper having a first sheet and a second sheet superposed with a gap formed in the first sheet, the printing paper is suitable for printing. It is possible to apply pressure uniformly with a simple configuration of only the structure of the platen roller without using an expensive and complicated control device or the like. In particular, according to the printer of the first invention, the print quality can be maintained at a predetermined level. In particular, according to the platen roller for a printer of the second invention, it is possible to cope with printing papers having different gap sizes and the like with a simple operation.

1 is a side view of a printer according to a first embodiment of the present invention applied to a double-sided label printer 1. FIG. FIG. 2 is a front view of the first platen roller 17 in FIG. 1. It is the II-II sectional view taken on the line of FIG. FIG. 2 is a cross-sectional view taken along line II when the first platen roller 17 of FIG. 1 is pressed against the thermal head 20. It is a front view of the 1st platen roller 40 of Example 2 of the present invention. 3 is a front view when the first platen roller 40 is pressed by the first thermal head 18. FIG. It is sectional drawing at the time of the conventional double-sided label continuous body L which has the gap | interval 58 being pressed by the platen roller 59 and the thermal head 60. FIG.

  A first embodiment will be described with reference to FIGS. In addition, below, the part similar to the past is attached | subjected to attaching | subjecting the same code | symbol, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a side view of a double-sided label printer 1 according to a first embodiment of the present invention. As shown in the figure, the double-sided label printer 1 includes a label supply unit 2, a label transfer unit 3, a label detection unit 4, and the like. , A label printing unit 5, a label cutting unit 6, and a control unit 7.

The label supply unit 2 is configured to load the continuous double-sided label L in a roll form on the label supply reel 8 and supply the continuous double-sided label L to the label transfer unit 3.

The label transfer unit 3 includes a guide roller 9, a label width regulation guide 10, a driven roller 11, and a driving roller 12. The guide roller 9 is rotatably arranged on the upstream side of the label printing unit 5 and guides the non-mounting label continuous body L to be transferred to the label printing unit 5. The label width regulation guide 10 is disposed between the guide roller 9, the driven roller 11, and the driving roller 12. By restricting the lateral width of the double-sided label continuum L, a label printing unit without meandering the double-sided label L so that a plurality of protrusions 32 of the first platen roller 17 to be described later fit into the corresponding gaps 58. Move to 5. The driven roller 11 and the driving roller 12 sandwich the label-less continuous body L on the upstream side of the label printing unit 5 and the downstream side of the label width regulation guide 10 and transfer to the label printing unit 5 while preventing meandering and sagging. Are arranged so as to face each other. One end of the shaft of the drive roller 12 is connected to a motor (not shown) via a belt, and a force from the drive source is transmitted to rotate in the transfer direction and the opposite direction. The label width regulation guide 10, the driven roller 11, and the driving roller 12 detect the label so that the plurality of protrusions 32 of the first and second platen rollers 17 and 19 are fitted in the corresponding gaps 58 without any deviation. It may be between the part 4 and the first printing part 15 or between the first printing part 15 and the second printing part 16.

  The label detection unit 4 includes a light emitter 13 and a light receiving unit 14. The light emitter 13 and the light receiving unit 14 are arranged on the back side of the double-sided label continuum L on the upstream side of the label printing unit 5 and on the downstream side of the label transfer unit 3. On the back surface of the double-sided label continuum L, marks (not shown) that reflect the light emitted from the light emitter 13 are printed at equal intervals. The back surface of the continuous body L is caused to emit light, and the light receiving unit 14 receives the reflected light from the mark, thereby detecting the position and transfer amount of the double-sided label continuous body L.

  The label printing unit 5 includes a first printing unit 15 and a second printing unit 16. The first printing unit 15 includes a first platen roller 17 and a first thermal head 18. The first platen roller 17 is the back side of the double-sided label continuous body L, and the first thermal head 18 is a double-sided label continuous. The double-sided label continuum L is placed opposite to each other on the surface side of the body L, and the double-sided label continuum L is sandwiched with a predetermined pressing force, printing is performed on the surface of the double-sided label continuum L, and the double-sided label continuum L is transferred. Yes. The second printing unit 16 includes a second platen roller 19 and a second thermal head 20. The second platen roller 19 is on the back side of the double-sided label continuous body L, and the second thermal head 20 is a double-sided label. The double-sided label continuous body L is placed opposite to the front side of the continuous body L, the double-sided label continuous body L is sandwiched with a predetermined pressing force, and printing is performed on the back surface of the double-sided label continuous body L. It is designed to be transported.

The label cutting unit 6 includes an upper cutter 21 and a lower cutter 22, and is opposed to the downstream side of the label printing unit 5 so that the blades of the upper cutter 21 and the lower cutter 22 are engaged with each other. The double-sided label continuous body L is cut by sandwiching the double-sided label continuous body L between the upper cutter 21 and the lower cutter 22 and driving the lower cutter 22.

  The control unit 7 includes a CPU, ROM, RAM, and the like (not shown), and is connected to the units 2, 3, and 4 through a data bus (not shown), and controls the operation of each unit.

  Next, the first and second platen rollers 17 and 19 will be described in detail. FIG. 2 is a front view of the first platen roller 17 of the printer according to the first embodiment. Since the second platen roller 19 has the same configuration as the first platen roller 17, the description thereof is omitted.

The shaft 30 is a metal such as a cylindrical stainless steel. The shape is not limited to a cylindrical shape, and may be, for example, a cylindrical shape. The material is not limited to metal but may be resin. Both ends of the shaft are supported by a bearing of a double-sided label printer 1 (not shown) so as to face the thermal head 18. Further, one end of the shaft 2 is connected to a drive source such as a motor (not shown) via a belt, and a force from the drive source is transmitted to rotate in the transport direction and the opposite direction. .

  The main body roller 31 is an elastic body made of, for example, urethane rubber or silicone rubber having a hollow central axis. The shaft 30 is inserted and fixed in the hole, and when the shaft 30 is rotationally driven, the main body roller 31 is also rotationally driven.

  As shown in the drawing, the plurality of projecting portions 32 are provided on the periphery of the main body roller at a predetermined interval, and the axial cross section projects in a rectangular shape radially outward. The projecting portion 32 may have an axial cross-sectional shape that is not a rectangle as long as it applies an appropriate pressure to the first coloring layer 54, and may be, for example, a circular shape or an elliptical shape. The length A in the direction of the axis 30 with a predetermined interval between the plurality of protrusions 32 corresponds to the width G of the adhesive 52, and when the protrusion 32 presses the second sheet 51, the release agent 53 becomes an adhesive. In order to be wound in the 52 direction, it is desirable to have a length that allows the release agent 53 to be wound in addition to G. The length B in the axial direction 30 of the protruding portion 32 corresponds to the gap width H of the double-sided label continuous body L, and the adhesive 52 applied to the second sheet 53 adheres to the protruding second base material 57. In order to prevent this, it is desirable that the length be shorter than H and that the first color forming layer 54 has a length to which an appropriate printing pressure is applied. The length C protruding outward in the radial direction shown in FIG. 3 corresponds to the thickness C of the adhesive 52, and in order to apply a uniform printing pressure to the first coloring layer 54, C is I It is desirable that the length be approximately the same as

The double-sided label printer 1 according to the first embodiment has the above-described configuration, and the double-sided label continuous body L is supplied by the label supply unit 2, and the supplied double-sided label continuous body L is supplied by the label transfer unit 3. The width is regulated by the width regulation guide 12 and is conveyed to the label printing unit 5 while being prevented from meandering and skewing by being pressed and sandwiched between the driven roller 11 and the driving roller 12. As shown in FIG. 4, the non-mounting label continuum L transferred to the label printing unit 5 is applied to the first thermal head 18 pressed by the first platen roller 17 and the pressing spring 33 in the first printing unit 15. The gaps 58 of the double-sided label continuum L are filled by pressing the second sheet 51 in the direction of the gap 58 and pressing the second sheet 51 into the gap 58. As a result, an appropriate pressure is applied to the first coloring layer 54, and heat is received at the contact point between the heating element of the thermal head 18 and the coloring layer 54, and information set at a predetermined position is printed. After printing on the first coloring layer 54, it is transferred to the second printing unit 16 and is pressed and clamped between the second platen roller 19 and the second thermal head 20, and the same operation as the first printing unit 15 is performed. The second coloring layer 56 is printed. After printing on both sides, the double-sided label continuum L is cut at a set position by the label cutter 6 driving the upper cutter 21 and the lower cutter 22.

  Thus, according to Example 1, there is a gap 58 between the first sheet 50 and the second sheet 51 of the double-sided label continuum L, and printing is performed on the coloring layer (first coloring layer 54) on which printing is performed. Even when an appropriate pressure is not applied to the other sheet (second sheet 51), the protrusion 58 provided on the periphery of the platen roller 17 is pressed against the other sheet (second sheet 51), and the other sheet is protruded into the gap 58. Can fill up and apply an appropriate pressure to printing. Further, the distance A between the plurality of protrusions 32 in the direction of the axis 30 is set longer than the length G of the adhesive 52 in the direction of the axis 30 and the width B of the protrusion 32 in the direction of the axis 30 is set to an appropriate printing pressure. By making such a length and shorter than the width H in the direction of the axis 30 of the gap 58, the other protruding sheet is prevented from adhering to the adhesive 52, the surface of the other sheet is prevented from being disturbed, and smooth. Can be printed. Further, by making the length C of the protruding portion 32 protruding outward in the radial direction substantially coincide with the thickness I of the adhesive 52, the length C of the protruding other sheet is substantially equal to the thickness I of the adhesive 52. A uniform pressure can be applied to the color-developing layers that are coincident and to be printed. In addition, it is possible to apply an appropriate pressure to the printing and maintain the printing accuracy at a predetermined level only by providing the projection 32 on the platen roller 17 without using a control device or the like that takes up a large amount of cost. Further, even when the double-sided label continuous body L having different dimensions of the adhesive 52, the gap 58, and the release agent 53 is used, the platen can be obtained by making each dimension of the protruding portion 32 correspond to each dimension of the double-sided label continuous body L. By simply exchanging the roller 17, it is possible to correspond to each double-sided label continuum L.

  Although the length C of the protruding portion 32 protruding outward in the radial direction is substantially the same as the thickness I of the adhesive 52, the platen roller 40 and the thermal head 18 are pressed and sandwiched to perform printing. It is only necessary to apply substantially the same pressure as the portion pressed by the main body roller 42, and the length can be appropriately changed according to the elastic modulus of the adhesive.

  Next, the first platen roller 40 according to the second embodiment will be described with reference to FIGS. Since the second platen roller (not shown) has the same configuration as the first platen roller 40, the description thereof is omitted. In addition, the same parts as those in the first embodiment are given the same reference numerals, and duplicate descriptions are omitted.

FIG. 5 is a front view of the first platen roller 40 according to the second embodiment. As illustrated, the first platen roller 40 includes a shaft 41, a main body roller 42, and a protruding roller 43. Yes. Since the shaft 41 has the same configuration as the shaft 30, the description thereof is omitted.

  The main body roller 42 is an elastic body made of, for example, urethane rubber, silicone rubber or the like having a hole in the center axis. A shaft 41 is inserted and fixed in the hole with a predetermined interval, and when the shaft 41 is rotationally driven, the main body roller 42 is also rotationally driven. The length D in the direction of the axis 41 of the main body roller 42 corresponds to the width G of the adhesive 52. In the process in which the gap 58 is filled by the protruding roller 32 pressing the second sheet 51, the release agent 53 is the adhesive. In order to be wound in the 52 direction, it is desirable to have a length that allows the release agent 53 to be wound in addition to the width G.

  Similar to the main body roller 42, the protruding roller 43 is an elastic body having a hole in the center axis, and is inserted and fixed to the hole through the main body roller 42, and the protruding roller 43 rotates as the shaft 41 rotates. It comes to drive. The shape is such that the length E in the direction of the axis 41 of the protruding roller 43 corresponds to the gap width H of the continuous double-sided label L, and the second base material 57 on which the adhesive 52 applied to the second sheet 53 protrudes. In order to prevent adhesion to the first color layer, it is desirable that the length be shorter than H and that the first color forming layer 54 has such a length that an appropriate printing pressure is applied. The length F of the protruding roller 43 protruding outward in the radial direction corresponds to the thickness C of the pressure-sensitive adhesive 52 sandwiched by pressure during printing, so that a uniform printing pressure is applied to the coloring layer 54. , C is preferably a length that substantially matches I.

  The first platen roller 40 according to the second embodiment has the above-described configuration. As illustrated in FIG. 6, the first platen roller 40 presses the double-sided label continuous body L, so that the protruding roller 43 becomes the second sheet. 51 is protruded so as to enter the gap 58, the gap 58 is filled, and a pressure suitable for printing is applied almost uniformly to the first coloring layer 54, and printing is performed with high accuracy.

  As described above, according to Example 2, there is a gap 58 between the first sheet 50 and the second sheet 51 of the double-sided label continuum L, and printing is performed on the coloring layer (first coloring layer 54) on which printing is performed. Even when an appropriate pressure is not applied, the first platen roller 40 is pressed against a sheet (second sheet 51) to which printing is not performed, and the second sheet 51 is projected into the gap 58, so that the gap 58 is filled and printing is performed. Appropriate pressure can be applied. In addition, the length D of the main body roller 42 in the direction of the axis 41 is added to the width G of the corresponding adhesive 52, and a length enough to entrain the release agent 53 is provided, thereby peeling the second sheet 51 caused by pressing. The agent 53 can be smoothly wound around the adhesive 52 without any load. By setting the length E in the shaft 41 direction of the protruding roller 43 to be shorter than the gap 58 width H and to apply an appropriate pressure to printing, the pressure-sensitive adhesive 52 extends in the shaft 41 direction. Adhering to the second base material 57 can be prevented. The length F of the projecting roller 43 projecting outward in the radial direction is substantially matched with the thickness I of the pressure-sensitive adhesive 52 sandwiched by pressure during printing, so that the first coloring layer 54 is pressed through the gap 58. It is possible to apply substantially the same pressure to the portion that is pressed through the adhesive 52. Further, even if the protruding roller 43 is damaged due to wear or the like, only the damaged protruding roller 43 needs to be replaced, so that the cost can be reduced and the working efficiency can be increased. Also, for the double-sided label continuum L having different gaps, adhesives, release agents and the like of the double-sided label continuum L, various combinations of the main body roller 42 and the protruding roller 43 corresponding to each dimension can be used. It can correspond to the double-sided label continuum L.

  The length F of the protruding roller 43 protruding outward in the radial direction is substantially the same as the thickness of the adhesive 52. However, when printing is performed by pressing the platen roller 40 and the thermal head 18 between them, It is only necessary to apply substantially the same pressure as the portion pressed by the roller 42, and there is no particular limitation when the elastic modulus of the protruding roller 43 and the main body roller 42 are different.

  In this embodiment, the number, position, shape, and the like of each constituent member are not limited to the above-described embodiment, and the number, position, shape, and the like suitable for implementing the present invention can be achieved. The present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately changed within the scope of the technical idea of the present invention.

1 Double-sided label printer (Example 1, FIG. 1)
2 Label supply unit 3 Label transfer unit 4 Label detection unit 5 Label printing unit 6 Label cutting unit 7 Control unit 8 Label supply reel
9 Guide roller 10 Label width regulation guide 11 Driven roller 12 Drive roller 13 Light emitter 14 Light receiver 15 First printing unit 16 Second printing unit 17 First platen roller 18 First thermal head 19 Second platen roller 20 Second thermal head 21 Upper cutter 22 Lower cutter 30 Axis
31 Body roller 32 Projection 33 Pressing spring
40 First platen roller (Example 2 FIG. 5)
41 Axis 42 Main body roller 43 Projection roller 50 First sheet 51 Second sheet 52 Adhesive 53 Release agent 54 First coloring layer 55 First substrate 56 Second coloring layer 57 Second substrate 58 Gap

The present invention relates to a printer, and more particularly, to a printing paper, to the printer for providing proper pressure to print.

The present invention has been made in view of such problems, and printing is performed by filling a gap between a first sheet and a printing sheet having a second sheet obtained by polymerizing the first sheet with a gap. and its object is to provide a printer that supplies a pressure suitable for.

According to the printer of the present invention, a first sheet, when printing the printing paper and a second sheet which is polymerized by opening the gap to the first sheet, the printing paper, an appropriate pressure uniformly to the printing The application can be performed with a simple configuration of only the structure of the platen roller without using an expensive and complicated control device or the like. In particular, according to the printer of the first invention, the print quality can be maintained at a predetermined level. Particularly, according to the printer of the second invention, even print paper size and the like of the gap are different, can be dealt with a simple operation.

The label printing unit 5 includes a first printing unit 15 and a second printing unit 16. The first printing unit 15 includes a first platen roller 17 and a first thermal head 18. The first platen roller 17 is the back side of the double-sided label continuous body L, and the first thermal head 18 is a double-sided label continuous. The double-sided label continuum L is placed opposite to each other on the surface side of the body L, and the double-sided label continuum L is sandwiched with a predetermined pressing force to perform printing on the surface of the double-sided label continuum L and to transport the double-sided label continuum L Yes. The second printing unit 16 includes a second platen roller 19 and a second thermal head 20. The second platen roller 19 is on the surface side of the double-sided label continuous body L, and the second thermal head 20 is a double-sided label. Oppositely arranged on the back side of the continuous body L, the double-sided label continuous body L is sandwiched with a predetermined pressing force, printing is performed on the back surface of the double-sided label continuous body L, and the double-sided label continuous body L is fed to the label cutting unit 6. It is designed to be transported.

Thus, according to Example 1, there is a gap 58 between the first sheet 50 and the second sheet 51 of the double-sided label continuum L, and printing is performed on the coloring layer (first coloring layer 54) on which printing is performed. Even when an appropriate pressure is not applied to the other sheet (second sheet 51), the protrusion 58 provided on the periphery of the platen roller 17 is pressed against the other sheet (second sheet 51), and the other sheet is protruded into the gap 58. Can fill up and apply an appropriate pressure to printing. Further, the distance A between the plurality of protrusions 32 in the direction of the axis 30 is set longer than the length G of the adhesive 52 in the direction of the axis 30 and the width B of the protrusion 32 in the direction of the axis 30 is set to an appropriate printing pressure. such degree of length, and by less than the axial 30 direction width H of the gap 58 prevents the other sheet projecting from adhering to the adhesive 52, the smoothness of the other sheet surface is inhibited by it prevent Rukoto can straining facilities printing smoothly. Further, by making the length C of the protruding portion 32 protruding outward in the radial direction substantially coincide with the thickness I of the adhesive 52, the length C of the protruding other sheet is substantially equal to the thickness I of the adhesive 52. A uniform pressure can be applied to the color-developing layers that are coincident and to be printed. In addition, it is possible to apply an appropriate pressure to the printing and maintain the printing accuracy at a predetermined level only by providing the projection 32 on the platen roller 17 without using a control device or the like that takes up a large amount of cost. Further, even when the double-sided label continuous body L having different dimensions of the adhesive 52, the gap 58, and the release agent 53 is used, the platen can be obtained by making each dimension of the protruding portion 32 correspond to each dimension of the double-sided label continuous body L. By simply exchanging the roller 17, it is possible to correspond to each double-sided label continuum L.

Similar to the main body roller 42, the protruding roller 43 is an elastic body having a hole in the center axis, and is inserted and fixed to the hole through the main body roller 42, and the protruding roller 43 rotates as the shaft 41 rotates. It comes to drive . The length E in the axial direction 41 of the protruding roller 43 corresponds to the gap width H of the double-sided label continuous body L, and the adhesive 52 applied to the second sheet 53 adheres to the protruding second base material 57 . In order to prevent this, it is desirable to have a length shorter than H and sufficient to apply an appropriate printing pressure to the first coloring layer 54. The length F of the protruding roller 43 protruding outward in the radial direction corresponds to the thickness I of the adhesive 52 when pressed between the first platen roller 40 and the first thermal head 18 during printing . In order to apply a uniform printing pressure to the coloring layer 54, it is desirable that F has a length that substantially matches I.

Claims (3)

A transfer unit capable of transferring printing paper having a first sheet and a second sheet superposed with a gap formed in the first sheet;
A printer having a printing section for printing the printing paper,
The printing unit is
Thermal head,
It has a platen roller arranged opposite to this thermal head,
This platen roller
A shaft rotatably supported in a direction crossing the transfer direction of the printing paper;
A cylindrical body roller arranged on this shaft;
A protrusion that protrudes radially outward of the main body roller and presses the printing paper to fill the gap;
A printer comprising: The printing unit is
A first thermal head that is located upstream in the transfer direction of the printing paper and that prints on the first surface of the printing paper;
A first platen roller disposed opposite to the first thermal head;
A second thermal head that is located downstream in the transfer direction of the printing paper and that prints on the second surface of the printing paper;
A second platen roller disposed opposite to the second thermal head;
The printer according to claim 1, further comprising: The platen roller is
A shaft rotatably supported in a direction crossing the transfer direction of the printing paper;
A plurality of cylindrical body rollers arranged on this shaft;
A projecting roller that is disposed between the main body rollers, projects outward in the radial direction of the main body roller, and presses the printing paper to fill the gap;
The printer according to claim 1, further comprising:

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