JP2013193261A - Platen roller and label printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a platen roller having peelability and transportability, and a label printer including the platen roller.SOLUTION: A platen roller 14 for supporting a label continuous body on an elastic body surface coated on a peripheral surface of a cored bar for transport is structured such that a groove is formed on the elastic body surface 24 and many groove patterns having a V-shaped portion 32A acute in a peripheral direction of the elastic body and in a transporting direction of the label continuous body are formed from the groove. A rear face of the label continuous body is supported by the platen roller 14 to transport the label continuous body, and a thermal head is brought into contact with the surface of the label continuous body supported by the platen roller 14. In a label printer thus structured for printing, the platen roller 14 is employed.

Description

  The present invention relates to a platen roller and a label printer, and more particularly to an improvement of a platen roller suitable for a mountless label.

  As a thermal type label printer that performs printing using a thermal head, a thermal transfer type label printer using an ink ribbon (for example, Patent Document 1) and a thermal type (direct thermal type) using a label continuous body having a thermal coloring layer. Label printer).

  In both thermal transfer type and thermal type label printers, the roller part supports the back side of the belt-like label continuous body with a platen roller formed of an elastic material such as rubber, and the label continuous body is generated by the frictional force of the platen roller surface. The thermal head is brought into contact with the surface (printing surface) of the label continuum supported by the platen roller, and printing is performed by the heat scanning.

  In such printing, if the grip force on the peripheral surface of the platen roller is small and slippery with respect to the label continuum, there is a problem that the label continuum is not correctly conveyed and print shrinkage or the like occurs and the print quality is impaired (hereinafter referred to as “conveyance failure”). ").

  On the other hand, if the grip force on the peripheral surface of the platen roller is large and the peelability is too small with respect to the label continuous body, the label continuous body L is sandwiched between the platen roller 102 and the thermal head 104 as shown in FIG. In doing so, there is a problem that the continuous label L is caught on the platen roller 102 without being peeled off from the platen roller 102 (hereinafter referred to as “peeling failure”).

  Therefore, in order to perform high-quality printing on the label continuous body, the platen roller is required to have a roller peripheral surface having both an appropriate conveyance force (grip force) and peeling force for the label continuous body. Is done.

  On the other hand, the label continuum used in the thermal type label printer is roughly classified into a label with mount and a label without mount.

  Conventionally, a label with a general mount, which has been used conventionally, is provided with a strip mount for the purpose of protecting the adhesive layer on the back side of the single label by temporarily attaching the single labels to the strip mount at regular intervals. Therefore, when the label with mount is conveyed through the label printer, the adhesive layer is covered with the mount. Thereby, when using a label with a mount, the peeling force of the platen roller is not so problematic.

However, the label with the mount becomes a garbage because the strip mount is not required after the single label is attached to the adherend. Further, the label with mount and the label without mount are set in the label printer as rolls wound in a roll shape, but the roll diameter of the label with mount is increased by the thickness of the mount. Therefore, there is a problem that the label with the mount is not efficient because the number of unit labels is smaller than the label without the mount with the same roll diameter.
For this reason, in recent years, a label without a mount and a mountless label have been frequently used from the viewpoint of environmental problems and efficiency.

  However, as described with reference to FIG. 10, the label without a mount has a problem that a peeling failure is likely to occur because an adhesive layer is formed on the back surface with which the platen roller 102 contacts.

  As a method for improving the peeling force for a continuous label, particularly a label without a mount, it is conceivable to form a groove on the peripheral surface of the platen roller to reduce the contact area with the back of the label without the mount. For example, Patent Document 2 discloses that a groove is formed on the peripheral surface of the platen roller, although the purpose is to release the gas released from the recording medium by the heat of the thermal head, which is different from the improvement in the peeling force of the present application. Yes.

JP 09-95018 A JP-A-2005-231218

  However, as in Patent Document 2, there is a problem that sufficient peelability cannot be ensured with respect to a label without a mount by simply forming a groove on the peripheral surface of the platen roller. In particular, when there is a long time (for example, 1 hour or more) after printing and issuing a single label, the next single label is printed and issued, the adhesion of the back surface of the label without a mount to the platen roller becomes strong. As a result, when the platen roller is rotated in order to print and issue the next single label, a peeling failure occurs and the risk that the label without a mount is caught on the platen roller increases.

  The present invention has been made in view of such circumstances, and includes a platen roller that does not cause a conveyance failure or a peeling failure even when a label continuum, particularly a label without a mount, is used. An object is to provide a label printer provided.

  In order to achieve the above object, the platen roller according to the present invention is a platen roller that supports and conveys a continuous label body on the surface of an elastic body covered with a peripheral surface of a core metal. And a plurality of groove patterns having sharp V-shaped portions in the circumferential direction of the elastic body and in the transport direction of the label continuous body are formed by the grooves.

  According to the platen roller of the present invention, a plurality of grooves are formed on the surface of the elastic body that is a roller portion of the platen roller, and the grooves are pointed in the circumferential direction of the elastic body and in the conveyance direction of the label continuous body. A large number of groove patterns having a V-shaped portion are formed.

  Accordingly, when the platen roller is rotated to convey the label continuous body, the label continuous body is easily peeled off starting from the sharp V-shaped portions of the groove pattern formed on the elastic body surface.

This is the same reason that when peeling a seal bonded to the backing sheet via an adhesive, it is easier to remove from the corner than from the side of the seal.
In the platen roller of the present invention, the groove pattern is preferably a rhombus pattern.

By making the groove pattern a rhombus pattern, it is possible to form a V-shaped portion on the elastic body surface of the platen roller in a direction opposite to the direction in which the platen roller issues the label continuous body.
As a result, the platen roller may rotate in the direction opposite to the direction in which the label continuum is issued to convey the label continuum. However, by making the groove pattern a rhombus pattern, either the forward direction or the reverse direction The peelability of the label continuum is improved even during transportation.

  In the platen roller of the present invention, the major axis dimension of the rhombus pattern is 1.9 mm or more and 3.9 mm or less, the minor axis dimension is 1.15 mm or more and 2.15 mm or less, and the elastic body surface is JIS spring type hard. It is preferable that it is 30 degrees or more and 70 degrees or less in A hardness by a height tester A type.

  This shows the range of the major axis dimension and the uniaxial dimension preferable for the releasability in the rhombus pattern, and the suitable hardness of the elastic body surface.

  In the platen roller of the present invention, it is preferable that the rhombus pattern is formed at a rate of one per one part when the circumferential direction of the elastic body surface is 10 or more and 20 or less.

  When one rhombus shape formed on the elastic body surface is increased, the area of the groove portion is reduced, so that the contact area with the label continuous body is increased. This acts in a direction in which the conveying force increases and the peeling force decreases. On the other hand, when one rhombus shape formed on the elastic body surface is reduced, the area of the groove portion is increased, so that the contact area with the label continuous body is reduced. This acts in a direction in which the conveying force decreases and the peeling force increases.

  From this point of view, when considering a rhombus shape having an appropriate size, when the circumferential direction of the elastic body surface is equal to or greater than 10 and equal to or less than 20 equal, the rhombus shape is formed at a rate of one per segment. It is preferable.

  In the platen roller according to the present invention, the depth of the groove is preferably 0.05 mm or more and 0.15 mm or less, and the width of the groove is preferably 0.1 mm or more and 0.2 mm or less.

  As a result, the platen roller according to the present invention has an appropriate contact area between the label continuous body and the elastic body surface, and has good transportability and peelability.

  In the platen roller of the present invention, it is preferable that the rhombus pattern has a bulge in which the radius of curvature R is 90 ≦ R ≦ 100 with the point where the major axis and the minor axis intersect with each other.

  As described above, the rhomboid pattern has a curvature radius R of 90 ≦ R ≦ 100, thereby further improving the transportability and the peelability.

In the platen roller according to the present invention, it is preferable that the elastic body is made of a mixture of a thermoplastic elastomer composed of an olefin-based thermoplastic elastomer and a styrene-based thermoplastic elastomer.
Accordingly, the platen roller according to the present invention has an appropriate hardness on the surface of the elastic body, and has good transportability and peelability.

  In order to achieve the above object, the label printer according to the present invention conveys the label continuum by supporting the back surface of the label continuum with a platen roller, and thermally applies the surface of the label continuum supported by the platen roller. In a label printer that performs printing by bringing a head into contact, the platen roller is a label printer that uses the platen roller according to any one of claims 1 to 7.

Since the label printer according to the present invention uses the platen roller according to any one of claims 1 to 7 to improve transportability and peelability, problems such as label clogging and misprinting on the label occur. hard.
In the label printer according to the present invention, it is preferable to use a mountless label as the label continuum.

  As a result, even when a non-mounting label is used as the label continuum, problems such as label clogging and misprinting on the label are unlikely to occur.

  According to the platen roller according to the present invention, even when a label continuous body, in particular, a label without a mount is used as the label continuous body, the label continuous body sticks to the platen roller and is caught in the platen roller. Can be prevented. In addition, it is possible to prevent the label continuous body from sliding on the platen roller and causing a decrease in print quality. In addition, according to the label printer of the present invention, it is possible to suppress clogging and printing misalignment of the label continuum.

The figure which shows the whole structure of the label printer which concerns on embodiment of this invention. Perspective view of roll of label without mount and cross section of label without mount The perspective view explaining the platen roller of an embodiment of the invention The figure which showed the rhombus pattern which is one mode of the groove pattern on the elastic body surface Enlarged view of one diamond part in the diamond pattern Enlarged view of the groove formed on the elastic body Explanatory drawing explaining the effect | action of the rhombus pattern formed in the elastic body surface Explanatory drawing explaining the action of the raised rhombus shape Cross-sectional conceptual diagram showing the intermediate layer Diagram showing a conventional printing device

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a diagram showing an overall configuration of a label printer 10 according to an embodiment of the present invention.

  As shown in FIG. 1, a platen roller 14 is disposed on the label printer main body 12 of the label printer 10, and a thermal head 16 is provided facing the platen roller 14. The platen roller 14 and the thermal head 16 constitute a printing unit 18. In the printing unit 18, the platen roller 14 and the thermal head 16 sandwich the label continuous body 20, thereby applying a certain pressure for printing on the label continuous body 20. On the upstream side of the printing unit 18 that performs this printing, a roll 22 in which the label continuous body 20 is wound in a roll shape is rotatably supported by the paper feed shaft 19. The label continuum 20 is unwound from the label continuum roll 22 and conveyed to the printing unit 18. Then, the rotating shaft 28 </ b> A and the elastic body 23 of the platen roller 14 rotate in the direction of the arrow, whereby the label continuous body 20 is unwound from the roll 22 and conveyed to the printing unit 18. Reference numeral S denotes a sensor that detects a timing mark or the like printed on the label continuum 20 in order to control the printing timing. The label continuum 20 on which printing has been performed by the printing unit 18 is conveyed downstream of the printing unit 18.

  A peeling bar 26 is provided on the downstream side of the printing unit 18. This is because the label printer 10 shown in FIG. 1 is manufactured so as to be compatible with a label 20A without a mount and a label with a mount, which will be described later. In other words, the label printer main body 12 is provided with a peeling bar 26 having a triangular cross section adjacent to the platen roller 14, and the peeling bar 26 can peel the mount and the label so that the label without the mount is provided. In addition to being able to handle labels with mounts.

  In particular, when a non-mounting label 20A (also referred to as a non-separ (R) label, linerless label, etc.) as shown in FIG. 2 is used as the label continuous body 20, the platen roller according to the embodiment of the present invention is It is effective from the viewpoints of transportability and peelability.

FIG. 2 (a) shows a roll 22A around which a mountless label 20A is wound. The boardless label 20A is formed as a roll 22A obtained by winding the boardless label 20A into a roll. For example, perforations Lm are formed on the mountless label 20A at regular intervals, and a portion delimited by the perforations Lm is configured as a single label La.
The timing marks T provided on the non-mounting label 20A are provided at intervals of the single labels La, and rectangular black marks printed on the back side are used.

  FIG. 2B is an enlarged cross-sectional view of the non-mounting label cut along A-A in FIG. As shown in FIG. 2B, the label 20A without mount includes a release agent layer 41 made of silicone or the like that is transparent from the upper layer, a thermosensitive coloring layer 42 that develops color when heated by a thermal head, hot melt glue, emulsion glue, or the like. It is comprised from the adhesive layer 43 which consists of.

  FIG. 2B shows an example of a non-mounting label 20A applied to a thermal label printer. The non-mounting label applied to a transfer type label printer provided with an ink ribbon does not require the thermosensitive coloring layer 42.

  When the mountless label 20 </ b> A as shown in FIG. 2 is used as the label continuous body 20, the platen roller 14 according to the embodiment of the present invention particularly effectively exhibits good transportability and peelability.

  The platen roller 14 according to the embodiment of the present invention can be applied to both a direct type (also referred to as a thermal type) and a transfer type (also referred to as an ink ribbon type) label printer.

  FIG. 3 is a perspective view showing the platen roller 14. The platen roller 14 is formed by covering a circumferential surface of a cored bar 28 with a cylindrical elastic body 23, and a cored bar portion protruding left and right of the elastic body 23 is rotatably supported by a bearing (not shown) as a rotation shaft 28A. . As a result, the back surface of the label continuum 20 unwound from the roll 22 is supported by the elastic body surface 24 of the elastic body 23, and the rotating shaft 28 </ b> A of the platen roller 14 is rotated by a drive mechanism (not shown). Transport.

  The elastic surface 24 is formed with grooves and a plurality of groove patterns having V-shaped portions 32A that are pointed in the circumferential direction of the elastic body 23 and in the conveying direction of the label continuous body 20 by the grooves. Yes. The angle v of the V-shaped portion is 90 ° ≦ v ≦ 170 °, preferably 100 ° ≦ v ≦ 150 °, and more preferably 120 ° ≦ v ≦ 140 °. When the angle v is within the above range, the peelability tends to be improved.

In the embodiment of the present invention shown in FIG. 3, the sharp V-shaped portions are arranged in the circumferential direction of the elastic body. The sharp V-shaped portion is formed in the transport direction of the label continuum (indicated by an arrow in FIG. 3).
FIG. 4 shows a rhombus pattern which is a preferred embodiment of the groove pattern having the V-shaped portion 32A.

  As shown in FIG. 4, a plurality of grooves 30 intersecting each other are formed on the elastic body surface 24 of the platen roller 14 according to the embodiment of the present invention, and a large number of rhombuses 32 are elastically formed by the intersecting grooves 30. A rhombus pattern is formed which is arranged in the circumferential direction of the body and in the axial direction (roll width direction). The size of the rhombus pattern is preferably uniform.

  FIG. 5 is an enlarged view of one rhombus 32 in the rhombus pattern on the elastic surface 24, FIG. 5 (a) is a view of the rhombus viewed from the side, and FIG. It is the figure seen from the top.

  5 (a) and 5 (b), X is a short axis among the axes connecting the opposite corners of the rhombus 32, and Y is a long axis. The upper limit of the length of the short axis X in the rhombus 32 is 2.15 mm or less, preferably 2 mm or less, more preferably 1.75 mm or less. The lower limit of the length of the minor axis X in the rhombus 32 is 1.5 mm or more, preferably 1.6 mm or more, and more preferably 1.7 mm or more.

  The upper limit of the length of the major axis Y in the rhombus 32 is 3.9 mm or less, preferably 3.7 mm or less, more preferably 3.5 mm or less. The lower limit of the length of the major axis Y is 1 mm or more, preferably 1.5 mm or more, more preferably 1.75 mm or more.

  The area of the theoretical rhombus 32 determined by the minor axis X × major axis Y ÷ 2 is related to the contact surface between the rhombus surface 34 and the label continuum 20, and is therefore related to the transportability and peelability. . That is, the larger the area of the rhombus 32, the greater the frictional force at the contact surface between the rhombus surface 34 and the label continuum 20 and the better the conveying force. However, since the frictional force at the contact surface between the rhombus surface 34 and the label continuum 20 is increased, the peelability is deteriorated. On the other hand, the smaller the area of the rhombus surface 34, the worse the conveying force but the better the peelability. From this, it is preferable that the rhombus 32 has the rhombus 32 formed at a rate of one per one part when the circumferential direction of the elastic body surface is 10 or more and 20 or less. The number of rhombuses 32 formed in the axial direction of the elastic body 23 is defined by the width dimension of the elastic body 23.

  As a result, the V-shaped portions 32A are appropriately arranged so that both the transportability and the peelability can be balanced. Moreover, when equally divided as described above, it is efficient from the viewpoint of manufacturing the platen roller 14 of the present invention.

  FIG. 6 is a cross-sectional view of the elastic body 23 of the platen roller 14 according to the present invention. As shown in FIG. 6, the groove 30 has a groove depth H and a groove width W. The groove depth H in the groove 30 is 0.05 mm or more and 0.15 mm or less, preferably 0.07 mm or more and 0.12 mm or less. The groove width W in the groove 30 is 0.1 mm or more and 0.2 mm or less, preferably 0.12 mm or more and 0.175 mm or less.

  As described above, since a large number of rhombuses 32 are formed by the grooves 30 on the surface 24 of the elastic body 23, when the platen roller 14 is rotated to convey the label continuous body 20, the label continuous body 20 Is easy to peel off from the pointed V-shaped portion 32A of the rhombus 32.

  As shown in FIG. 7, in the seal S, when the seal portion C adhered to the mount portion B via an adhesive is peeled off, it is peeled off from the corner portion C2 rather than from the side portion C1 of the seal portion C. This is the same reason that it is easier to peel off.

  That is, in the platen roller 14 according to the present invention, a plurality of V-shaped portions 32 </ b> A, which are the many corner portions C <b> 2 described above, are formed on the surface of the elastic body 23 along the conveyance direction of the label continuous body 20. As a result, when the platen roller 14 is rotated, it is considered that the V-shaped portions 32A arranged in the conveyance direction of the label continuous body 20 are peeled one after another. Thereby, it is thought that the peelability of the label continuous body 20 and the elastic body surface 24 improves.

  In addition, as shown in FIG. 5A, the rhombus surface 34 of the rhombus 32 has a curved shape that rises with the center point F (see FIG. 5B) of the rhombus 32 as a vertex. preferable. For example, as a degree of swell of the rhombus 32, the radius of curvature R is 90 ≦ R ≦ 110, more preferably 95 ≦ R ≦ 105.

  Thus, when the rhombus surface 34 is curved and raised, it differs from the theoretical contact area of the surface 34 of the rhombus 32 determined by the short axis X × long axis Y / 2. Therefore, the contact area between the surface 34 of the rhombus 32 and the label continuum 20 is appropriate, and the transportability and peelability are improved.

  FIG. 8 shows a contact surface between the raised rhombus 32 and the label continuum 20. That is, as shown in FIG. 8A, by raising the rhombus 32, a gap is formed between the rhombus surface 34 of the rhombus 32 and the label continuous body 20. By forming this gap, it is considered that the peelability is improved.

  When the label continuum 20 is at the same position on the platen roller for a long time (the label printer is stopped), the label continuum 20 sticks to the entire surface 34 of the rhombus 32 as shown in FIG. , There may be no gap.

  However, even in the case shown in FIG. 8 (b), the platen roller 14 of the present invention has a label continuous body due to the synergistic action of the V-shaped portion 32A of the rhombus 32 formed on the elastic body 23 and the rise of the rhombus 32. 20 can be easily peeled off.

  Therefore, when the adhesive layer on the back side of the label is in direct contact with the platen roller 14 as in the label 20A having no mount in the label continuous body 20, the rhomboid 32 is raised because the peelability is required more than the transportability. It is effective.

  The elastic body 23 of the platen roller 14 of the present invention is preferably made of a mixture of a thermoplastic elastomer composed of an olefin-based thermoplastic elastomer and a styrene-based thermoplastic elastomer.

  The ratio of the hard segment to the soft segment in the olefin-based thermoplastic elastomer is such that the hard segment is 10 to 50 parts by weight, the soft segment is 50 to 90 parts by weight, and the total is 100 parts by weight. preferable. The ratio of the hard segment to the soft segment in the styrene-based thermoplastic elastomer is 10 to 50 parts by weight of the hard segment, 50 to 90 parts by weight of the soft segment, and the total is 100 parts by weight. Is preferred.

  As the third component diene of the ethylene-propylene-diene copolymer, dicyclopentadiene and 5-ethylidene-2-norbornene are preferably used from the viewpoint of polymerization reactivity.

  Further, in order to sufficiently provide the necessary characteristics as a platen roller, the blending ratio of the olefinic thermoplastic elastomer and the styrene thermoplastic elastomer is such that the olefinic thermoplastic elastomer is 20 parts by weight or more and 80 parts by weight or less. The thermoplastic elastomer is preferably 20 parts by weight or more and 80 parts by weight or less, and the total of these two thermoplastic elastomers is preferably 100 parts by weight.

  When the olefin-based thermoplastic elastomer is less than 20 parts by weight (styrene-based thermoplastic elastomer is more than 80 parts by weight), it is impossible to polish with a low hardness, and heat with good polishing processability with a high hardness. There is a drawback that it cannot be polished to the same extent as a curable rubber. On the other hand, when the olefinic thermoplastic elastomer exceeds 80 parts by weight (the styrene thermoplastic elastomer is less than 20 parts by weight), the friction coefficient decreases and the conveying power is high. Cannot be ensured, and wear resistance is poor.

  The platen roller of the present invention is a platen roller excellent in peelability. The peelability as used herein refers to the ease of peeling (separating) from the platen roller of the label continuum. If the peelability is not good, as shown in FIG. 10, there arises a problem that the label continuum L is caught around the platen roller 102.

  The platen roller 14 of the present invention is a platen roller having high transportability. “High transportability” means that the label continuous body 20 can be transported by the platen roller 14 without any problem. The problem here means that the label continuum 20 slides on the elastic body surface 24 of the platen roller 14, and the label continuum 20 cannot be conveyed.

  The platen roller 14 of the present invention is a platen roller having high peelability. The high peelability means that the label continuous body 20 is easily peeled off from the platen roller 14 after the label continuous body 20 is sandwiched between the platen roller 14 and the thermal head 16. In particular, when the label without a mount is not high in peelability, there arises a problem that the label continuum L is caught in the platen roller 102 as shown in FIG.

  As shown in FIG. 9, in the platen roller 14 of the present invention, one or a plurality of intermediate layers 36 may be provided between the rotating shaft 28 </ b> A and the elastic body 23.

  The printer including the platen roller excellent in peelability and transportability according to the present invention is less likely to cause problems such as clogging of the label continuous body. That is, since the platen roller of the present invention has good peelability, it is difficult to cause a problem when the label continuous body is wound. Also, since the platen roller of the present invention has excellent transportability, the label continuous body is made of the platen roller. It is difficult for problems such as sliding on the rollers to occur.

  For example, the platen roller of the present invention can be manufactured as follows. As a material for the platen roller 14 made of silicone rubber, a material having a diameter φ = 10.1 mm and a hardness Q = 50 ° (weight 12.5 g) is prepared. It was prepared by polishing and removing a groove having a width of 1 mm and a width W = 0.1 mm with a grinding wheel. The produced grooves form a pattern in which rhombuses having a major axis of 3 mm and a minor axis of 1.75 mm are uniformly arranged on the elastic body surface.

  Furthermore, in the embodiment of the present invention, conditions such as the diameter of the platen roller, the length of the portion with the peripheral surface, the weight, the number of grooves, etc. are not necessarily limited to this, and may be changed as appropriate. It does not matter.

10: label printer, 12: label printer main body, 14: platen roller, 16: thermal head, 18: printing unit, 19: paper feed shaft, 20: label continuous body, 20A: label without mount, 22: label continuous body roll 22A: label continuous roll without mount, 23: elastic body, 24: elastic body surface, 26: peeling bar, 28: core bar, 28A: rotating shaft, 30: groove, 32: rhombus, 32A: V-shaped part, 34: rhombus surface, 36: intermediate layer, 41: release agent layer, 42: thermosensitive coloring layer, 43: adhesive layer, 100: printing section, 102: platen roller, 104: thermal head, B: mount section, C: Seal part, C1: Side part, C2: Corner part, F: Center point, H: Groove height, L: Label continuous body, La: Single label, Lm: Perforation, M: Seal, W: Groove width, X : Short axis, Y: long axis, S: Sen , T: timing mark

In particular, when using mount unlabeled 20A as shown in FIG. 2 (also referred to as La Inaresuraberu) as the label continuum 20, a platen roller according to the embodiment of the present invention, the conveyance resistance, that peelability It is more effective from the viewpoint.

Claims (9)

In the platen roller that supports and conveys the label continuum on the elastic body surface coated on the peripheral surface of the core metal,
On the surface of the elastic body, grooves are formed and a plurality of groove patterns having sharp V-shaped portions in the circumferential direction of the elastic body and in the transport direction of the label continuous body are formed by the grooves. A featured platen roller.   The platen roller according to claim 1, wherein the groove pattern is a rhombus pattern.   The major axis dimension of the rhombus forming the rhombus pattern is 1.9 mm or more and 3.9 mm or less, the minor axis dimension is 1.15 mm or more and 2.15 mm or less, and the elastic body surface is JIS spring type hardness tester A The platen roller according to claim 1 or 2, wherein the A hardness according to the mold is 30 ° or more and 70 ° or less.   The rhombus that forms the rhombus pattern is formed at a rate of one per one portion when the circumferential direction of the elastic body surface is 10 or more and 20 or less. The platen roller described in 1.   The platen roller according to any one of claims 1 to 4, wherein a depth of the groove is 0.05 mm or more and 0.15 mm or less, and a width of the groove is 0.1 mm or more and 0.2 mm or less.   The platen roller according to any one of claims 1 to 5, wherein the rhombus forming the rhombus pattern has a bulge in which the radius of curvature R is 90≤R≤100 with the point where the major axis and the minor axis intersect as an apex. .   The platen roller according to any one of claims 1 to 6, wherein the elastic body is a mixture of a thermoplastic elastomer composed of an olefin-based thermoplastic elastomer and a styrene-based thermoplastic elastomer. In a label printer that supports the back side of the label continuum with a platen roller and conveys the label continuum, and performs printing by bringing a thermal head into contact with the surface of the label continuum supported by the platen roller,
A label printer using the platen roller according to claim 1 as the platen roller.   The label printer according to claim 8, wherein the label continuum is a label without a mount.

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