JP2014087988A - Elastic roller and method of supplying release agent to peripheral surface of elastic material of elastic roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic roller which replenishes a release agent 26, e.g. silicone oil, which tends to transfer from the peripheral surface of an elastic roller to an adhesive layer of a mount-less label or the like and can keep non-adhesiveness and detachability or releasability, over a long period and a method of supplying a release agent to the peripheral surface of the elastic material in the elastic roller.SOLUTION: An elastic material 22 has a two-layer structure consisting of an inner layer side elastic material 23 and an outer layer side elastic material 24 and contains a release agent 26 in the inner layer side elastic material 23, and the release agent 26 is exuded from a plurality of slits 25 onto the peripheral surface of the outer layer side elastic material 24. The inner layer side elastic material 23 contains the release agent 26; a plurality of the slits 25 perpendicular to the axial direction of the roller shaft 21 are formed along the axial direction from the outer layer side elastic material 24 to the inner layer side elastic material 23; and the release agent 26 in the inner layer side elastic material 23 can be exuded through the slits 25 to the peripheral surface of the outer layer side elastic material 24.

Description

    The present invention relates to an elastic roller and a method for supplying a release agent to the peripheral surface of the elastic material in the elastic roller, and in particular, a platen roller or a nip roller for transferring a label without a mount or a general label with a mount or other belt-like member Other rollers, especially an elastic body in an elastic body roller and an elastic body roller that can prevent the adhesive layer or the adhesive layer from sticking and prevent the unmounted paper label from being caught when transporting a non-mounting label, etc. The present invention relates to a method for supplying a release agent to the peripheral surface.

Conventionally, a non-mounting label has been developed that does not use a release paper (so-called backing) that is temporarily attached to the back side of the pressure-sensitive adhesive layer of the label, and is expected to be a resource-saving material because there is no mounting that will be discarded after use. Has been.
FIG. 9 is a perspective view showing a state in which a conventional non-mounting label 1 is wound in a roll shape. The non-mounting label 1 is a label base material as shown in an enlarged cross section in FIG. 2, a pressure-sensitive adhesive layer 3 on the back surface side, a heat-sensitive color former layer 4 on the front surface side, and a transparent release agent layer 5 on the upper layer side.
A position detection mark 6 is printed in advance on the back side of the label substrate 2.
Moreover, fixed information (not shown), such as a label user's mark, name, and other designs, can be printed in advance on the surface side of the label substrate 2 as necessary.
This label 1 without mount can be made into a single-leaf label piece 1A by cutting at a predetermined pitch along the planned cutting line 7.

    FIG. 10 shows an outline of a thermal printer 8 that is loaded with the non-mounting label 1 and prints variable information such as price, barcode, and other product information about goods and management information about goods or services as needed. The thermal printer 8 includes a supply unit 9 for the label 1 without mount, a guide unit 10, a detection unit 11, a printing unit 12, and a cutting unit 13.

    The supply unit 9 holds the roll-less mountless label 1 and allows the mountless label 1 to be fed out in a strip shape in the direction of the guide unit 10, the detection unit 11, the printing unit 12, and the cutting unit 13.

    The guide unit 10 includes a guide roller 14 and can guide the fed unmounted label 1 toward the detection unit 11 and the printing unit 12.

    The detection unit 11 includes a position detection sensor 15, detects the position detection mark 6 on the back side of the label 1 without mount, and detects the relative position of the label 1 without label (label piece 1 A) with respect to the print unit 12. Make it possible.

    The printing unit 12 includes a thermal head 16 and a platen roller 17 (elastic roller). The label 1 without a mount is sandwiched between the thermal head 16 and a platen roller 17 with a predetermined printing pressure. The platen roller 17 is rotationally driven at a constant speed. By supplying print data to the thermosensitive color former layer 4, the predetermined variable information can be printed on the label 1 without label (label piece 1 </ b> A).

    The cutting unit 13 has a fixed blade 18 and a movable blade 19, cuts the printed non-mounting label 1 transferred between them at the portion of the predetermined cutting line 7 with a predetermined pitch, and issues a label piece 1A. To do.

In the thermal printer 8 having such a configuration, a roller made of an elastic material such as a rubber material is used as the platen roller 17 for transferring and printing the label 1 without the mount, but the adhesive of the adhesive layer 3 is attached. In order to make it difficult for the platen roller 17 to adhere, the platen roller 17 is made of a silicone rubber material to which an adhesive does not easily adhere, or silicone oil, silicone-based paint, or the like is applied to the outer peripheral surface of the platen roller 17.
However, when the pressure-sensitive adhesive layer 3 comes into contact with the platen roller 17, the silicone oil moves to the pressure-sensitive adhesive of the pressure-sensitive adhesive layer 3. As a result of the gradual shortage of silicone oil on the outer peripheral surface of the platen roller 17, there is a problem that the peelability or releasability from the non-mounting label 1 is reduced.
Therefore, it is difficult to completely prevent adhesion of the adhesive during long-term use, and the non-mounting label 1 that has passed through the platen roller 17 is stuck to the platen roller 17 as it is (see FIG. 10 (see the phantom line)), there is a problem that the label is clogged, and the normal transfer of the label 1 without the mount, the printing, and the issuance of the label piece 1A are hindered.
Further, when the printing issue is stopped while the label 1 without the mount is sandwiched between the thermal head 16 and the platen roller 17, the label 1 without the mount is difficult to peel off from the surface of the platen roller 17. Thus, similarly to the above, there is a problem that the mountless label 1 is likely to be caught.

Therefore, in general, it is necessary to repeat maintenance such as the operation of cleaning the outer peripheral surface of the platen roller 17 or the replacement operation of the platen roller 17, and the platen roller 17 (which enables stable transfer and printing over a long period of time). An elastic roller) is demanded.
In addition to the platen roller 17, a label 1 without a mount, such as a nip roller (not shown) composed of a pair of rollers that are rotationally driven for transferring the label 1 without a mount according to the configuration of the printer, and a guide roller 14. There is also a demand for an elastic roller excellent in non-adhesiveness or releasability (release property) as a roller for simply guiding the above.

Furthermore, there is a demand for an elastic roller that can stably transfer the label 1 without mount or a label with a general mount even if any of these is loaded.
Similarly to the above-mentioned label 1 without mount, for example, in a coater or a printing machine, when transporting or guiding a paper or film-based belt-like member having an adhesive layer or an adhesive layer on the back side, as described above There are concerns about the occurrence of various problems, and an elastic roller excellent in non-adhesiveness or releasability (releasability) has been demanded.

JP 2011-31426 A

    The present invention is considered in view of the above problems, and is a non-adhesive or exfoliating (releasing property) platen roller or other elastic body roller, and peeling to the elastic material peripheral surface of the elastic body roller. It is an object of the present invention to provide an agent supply method.

    In addition, the present invention provides an elastic roller capable of replenishing a release agent such as silicone oil that moves from the peripheral surface of the elastic roller to an adhesive layer such as a label without a mount, and peeling to the elastic material peripheral surface of the elastic roller. It is an object of the present invention to provide an agent supply method.

    Moreover, this invention makes it a subject to provide the peeling agent supply method to the elastic material surrounding surface in an elastic body roller which can maintain non-adhesiveness and peelability over a long period of time, and an elastic body roller.

    That is, according to the present invention, an elastic material has a two-layer structure (an inner layer side elastic material and an outer layer side elastic material), a release agent is contained in the inner layer side elastic material, and a plurality of slits formed in the elastic material. Focusing on the exfoliation of the release agent on the outer surface of the outer elastic material, the first invention has a roller shaft and an elastic material attached around the roller shaft. An elastic roller for contacting and transporting the belt-shaped member, wherein the elastic material includes an inner-layer side elastic material provided on the outer periphery of the roller shaft and an outer periphery of the inner-layer side elastic material. The inner layer side elastic material contains a release agent, and extends from the outer layer side elastic material to the inner layer side elastic material and is perpendicular to the axial direction of the roller shaft. An elastic body characterized by forming the lit along the axial direction of the roller shaft so that the release agent of the inner layer side elastic material can ooze to the peripheral surface of the outer layer side elastic material through these slits It is a roller.

    The second invention has a roller shaft and an elastic material attached around the roller shaft, and the elastic member for the elastic roller for bringing the elastic material into contact with a belt-like member and transferring it to the circumferential surface of the elastic material. In the release agent supplying method, the elastic material includes an inner layer side elastic material provided on the outer periphery of the roller shaft, and an outer layer side elastic material provided on the outer periphery of the inner layer side elastic material and in contact with the belt-shaped member. The inner layer side elastic material contains a release agent, and has a plurality of slits perpendicular to the axial direction of the roller shaft in the axial direction of the roller shaft from the outer layer side elastic material to the inner layer side elastic material. Forming the release agent of the inner layer side elastic material through the slits to the peripheral surface of the outer layer side elastic material, and A release agent supplying method to the elastic member circumferential surface of the elastic body roller and supplying a release agent.

    The inner layer side elastic material is formed from a material containing the release agent, and the outer layer side elastic material is formed from a material not containing the release agent.

    The rubber hardness (hereinafter referred to as “A hardness”) according to the durometer type A defined in JIS K6253 standard of the inner layer side elastic material is desirably lower than the A hardness of the outer layer side elastic material.

    It is desirable that the inner layer side elastic material has an A hardness of 10 to 30 degrees, and the outer layer side elastic material has an A hardness of 30 to 80 degrees.

    A groove that communicates with the slit and opens on the peripheral surface of the outer layer-side elastic member can be formed at the outer end of the slit on the outer layer-side elastic member side in the slit.

    The peripheral surface of the outer layer side elastic material can be covered with a silicone-based paint containing fine powder.

    The inner layer side elastic material can have an uneven shape on the outer periphery.

    The inner layer side elastic member may have a star shape in cross section along the radial direction of the roller shaft.

    In the elastic roller according to the present invention and the method for supplying the release agent to the elastic material peripheral surface in the elastic roller, the elastic material has a two-layer structure, the inner layer side elastic material contains the release agent, and is formed into an elastic material. Since the release agent is allowed to exude to the peripheral surface of the outer layer side elastic material by a plurality of slits, the surface of the outer layer side elastic material (peripheral surface) is consumed with the use of the elastic roller. The release agent can be replenished from the inner layer side elastic material via the slit, and improves the non-adhesiveness or peelability of the elastic roller used by contacting with a predetermined pressure against a non-mounting label or other belt-like member be able to.

    In particular, according to the elastic roller of the first invention, the release agent contained in the inner layer side elastic material can be gradually supplied to the outer layer side elastic material little by little through the slit. A non-adhesiveness as an elastic roller can be maintained by supplementing and supplying the agent.

    In particular, according to the release agent supply method to the elastic material peripheral surface in the elastic roller of the second invention, the release agent is contained in the inner layer side elastic material, and this release agent is passed through the slit of the outer layer side elastic material. Since it is gradually supplied to the peripheral surface little by little, it is possible to replenish and supply the release agent that is consumed on the peripheral surface of the elastic roller.

It is a perspective view of the elastic body roller (platen roller 20) by the 1st example of the present invention. 2 is a side view of the platen roller 20. 2 is an enlarged cross-sectional view of the main part of the platen roller 20 in the axial direction. It is a principal part expanded sectional view of the axial direction of the elastic body roller (platen roller 30) by the 2nd Example of this invention. It is a perspective view of the elastic body roller (platen roller 40) by the 3rd Example of this invention. 2 is a side view of the platen roller 40. FIG. FIG. 10 is an enlarged sectional view in the axial direction of the roller shaft 21 in a state where the label 1 without mount is sandwiched between the thermal head 16 and the platen roller 40 in the thermal printer 8 (FIG. 10). 3 is an enlarged sectional view of the roller shaft 21 in the radial direction. It is a perspective view of the state which wound the conventional label 1 without the mount in roll shape. FIG. 5 is a schematic side view of a thermal printer 8 that is loaded with a label 1 without a mount and prints variable information such as prices, barcodes, and other product information about products and management information about goods or services as needed. is there.

    In the present invention, the elastic material has a two-layer structure, the release agent is contained in the inner layer side elastic material, and the release agent is exuded on the peripheral surface of the outer layer side elastic material by a plurality of slits formed in the elastic material. The replenishing agent that is consumed is replenished and supplied, so an elastic roller with excellent non-adhesiveness or releasability (release property) and a method for supplying the release agent to the elastic material peripheral surface in the elastic roller have been realized. .

Next, in the same manner as the platen roller 17 (FIG. 10), the platen roller in the thermal printer 8 is the same as the platen roller 17 (FIG. 10) in the elastic roller and the elastic roller according to the first embodiment of the present invention. An example of a case 20 (label elastic roller) will be described with reference to FIGS. However, the same parts as those in FIGS. 9 and 10 are denoted by the same reference numerals, and detailed description thereof will be omitted.
1 is a perspective view of a platen roller 20 (an elastic roller for labels), FIG. 2 is a side view of the platen roller 20, and FIG. 3 is an enlarged cross-sectional view of a main part in the axial direction of the platen roller 20.
The platen roller 20 includes a roller shaft 21 and an elastic material 22 that is attached to the periphery of the roller shaft 21 and can be rotated integrally with the roller shaft 21, and a label (for example, the above-described label 1 without mount, FIG. 9) is brought into contact and transferred.

    The elastic member 22 includes an inner layer side elastic member 23 provided on the outer periphery of the roller shaft 21 and an outer layer side elastic member 24 provided integrally with the outer periphery of the inner layer side elastic member 23 and in contact with the mountless label 1. .

As shown in the drawing, the outer circumference of the inner layer side elastic member 23 has a circular cross section.
That is, the inner layer side elastic material 23 has a uniform cross-sectional shape in the radial direction of the roller shaft 21, and the diameter of the inner layer side elastic material 23 is constant in the radial direction cross section of the roller shaft 21.

Further, a plurality of slits 25 (shown by dotted lines in FIG. 2) around the circumference in the direction perpendicular to the axial direction of the roller shaft 21 from the outer layer side elastic material 24 to the inner layer side elastic material 23. The elastic material 22 is divided into a plurality of unit elastic portions 22A, 22B, 22C,... That can be displaced independently of each other (FIGS. 1 and 3).
In the illustrated example, the slits 25 have a uniform slit interval W (FIG. 3) between adjacent slits 25 along the axial direction of the roller shaft 21.
For example, the slit 25 has a slit interval W of 0.50 to 1.00 mm.
Of course, the slit 25 can also make the slit interval W of the adjacent slits 25 non-uniform along the axial direction of the roller shaft 21.
When the slit width W exceeds 1.00 mm, the amount of exfoliation of the release agent 26 (described later) such as silicone oil is reduced, and sufficient peelability cannot be obtained.
When the slit width W is less than 0.50 mm, the strength of the platen roller 20 cannot be maintained. ,

The slit 25 is cut to a part of the inner layer side elastic member 23 through the outer layer side elastic member 24. In the illustrated example, the slit 25 is cut to the inner layer side elastic member 23 having a circular shape with a uniform depth in the elastic member 22.
Depending on the material of the platen roller 20 or its diameter, the slit 25 has its slit depth D (FIG. 3) inward from the outer surface of the elastic material 22, for example, the diameter of the platen roller 20 as a whole. In the case of about 10 to 30 mm, it can be set to 1.00 to 3.00 mm.

Of course, this slit depth D is arbitrary, and the slit 25 can be cut from the outer layer side elastic member 24 through the inner layer side elastic member 23 to the depth immediately before reaching the roller shaft 21 at the deepest. Thus, the amount and speed of exudation of the release agent 26 (described later) such as silicone oil can be adjusted.
In addition, the slit depth D can be provided non-uniformly or uniformly for each slit 25 in the axial direction of the roller shaft 21.
Furthermore, also in the radial direction of the roller shaft 21, the slit depth D can be provided non-uniformly or can be made uniform.

The ratio D: W of the slit depth D to the slit interval W can be in the range of 6: 1 to 1: 3, and is preferably in the range of 3: 1 to 1: 2.
When the ratio D: W exceeds 6: 1, that is, even when the slits 25 are formed deeper and the interval between them is narrowed, the deep portions of the unit elastic portions 22A, 22B, 22C,. In this case, since the amount of deformation is small, it is impossible to improve the exfoliation effect of the release agent, and the platen roller 20 is easily damaged.
On the other hand, when the ratio D: W is less than 1: 3, it is difficult to obtain the release agent exudation effect due to the formation of the slit 25.

Further, the inner layer side elastic member 23 contains a release agent 26 (particularly drawn with dots in FIG. 3) such as silicone oil, and a pressing force (printing pressure) from the thermal head 16 is applied. The release agent 26 oozes out from the inner layer side elastic member 23 to the peripheral surface of the outer layer side elastic member 24 through the slit 25 by the pump action in the unit elastic portions 22A, 22B, 22C,. It is configured as follows.
However, even without the pumping action, the release agent 26 gradually exudes to the peripheral surface of the outer layer side elastic member 24 due to the capillary phenomenon of the slit 25 formed from the outer layer side elastic member 24 to the inner layer side elastic member 23.

The inner layer side elastic material 23 has an A hardness (rubber hardness according to durometer type A defined in JIS K6253 standard) equal to or lower than the A hardness of the outer layer side elastic material 24, and the inner layer side elastic material It is desirable that the elastic deformation 23 is larger than the outer layer side elastic material 24.
That is, an elastic repulsive force is generated with respect to the pressing force (printing pressure) from the thermal head 16 in each of the unit elastic portions 22A, 22B, 22C,. The unit elastic portions 22A, 22B, 22C, ... are adjacent to each other so that there is a slight difference in frictional force. The unit elastic portions 22A, 22B, 22C,... Do not return to the same state at the same timing, but push out the label 1 without the mount away from the platen roller 17 based on the restoring force. Acts so as to peel off the non-mounting label 1 that is transferred while contacting the platen roller 20 from the surface of the platen roller 20. There is expected.

As described above, the inner layer side elastic member 23 is likely to contain the release agent 26 such as silicone oil, and the outer layer side elastic member 24 is formed of a material that hardly contains the release agent 26.
Accordingly, as described above, the release agent 26 of the inner layer side elastic member 23 can gradually exude to the peripheral surface of the outer layer side elastic member 24 through the respective slits 25 by the pump action and the capillary phenomenon.

The inner layer side elastic member 23 and the outer layer side elastic member 24 can be formed of a thermoplastic elastic member.
Further, the inner layer side elastic member 23 and the outer layer side elastic member 24 can be made of a thermosetting elastic material such as silicone rubber of the same series.
Examples of the synthetic resin constituting the inner layer side elastic material 23 and the outer layer side elastic material 24 include polyethylene, polypropylene, polymethylpentene, polybutene, crystalline polybutadiene, polybutadiene, styrene butadiene resin, polyvinyl chloride, polyvinyl acetate, poly Vinylidene chloride, ethylene vinyl acetate copolymer, ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ionomer, polymethyl methacrylate, polytetrafluoroethylene, ethylene polytetrafluoroethylene copolymer, polyacetal (polyoxyl Methylene), polyamide, polycarbonate, polyphenylene ether, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polystyrene, polyethersulfone, polyi Polyamide, polyimide sulfide, polyphenylene sulfide, polyoxybenzoyl, polyether ether ketone, polyether imide, polystyrene, polyurethane, polyester, 1,2-polybutadiene, phenol resin, urea resin, melamine resin, benzoguanamine resin, diallyl phthalate resin, alkyd Resins, epoxy resins, and silicon resins can be used.
Further, for example, thermosetting elastic materials such as thermosetting silicone rubber, one-component RTV (Room Temperature Vulcanizing) rubber, two-component RTV rubber, LTV (Low Temperature Vulcanizable) silicone rubber, and oil-resistant thermosetting rubber. Can be used.

The action of supplying the release agent 26 to the peripheral surface of the outer-layer elastic material 24 by the platen roller 20 having such a configuration will be described with reference to FIG.
The inner layer side elastic material 23 contains a release agent 26, and a plurality of slits 25 are formed along the axial direction of the roller shaft 21 from the outer layer side elastic material 24 to the inner layer side elastic material 23, whereby a predetermined pressing force is formed. The release agent 26 of the inner layer side elastic member 23 is passed through the slits 25 of the outer layer side elastic member 24 along with the transfer of the non-mounting label 1 by the platen roller 20 and the thermal head 16 under pressure or printing pressure. It can be exuded on the peripheral surface (see dotted arrows in FIG. 3).
Therefore, the release agent 26 that supplies the release agent 26 to the peripheral surface of the elastic material 22 (outer layer side elastic material 24) is supplied, and the peelability or non-adhesiveness as the platen roller 20 can be maintained over a long period of time. The stable transfer of the label 1 without the mount can be ensured.

FIG. 4 is an enlarged cross-sectional view of the principal part of the platen roller 30 according to the second embodiment of the present invention in the axial direction. The platen roller 30 is the platen roller 20 described above (first embodiment, FIG. 1). However, in the platen roller 30, the slit 25 communicates with the slit outer end 25 </ b> A on the outer layer side elastic member 24 side and opens on the peripheral surface of the outer layer side elastic member 24. A groove 31 is formed.
The shape of the groove 31 is arbitrary, and in the illustrated example, the groove 31 has a V-shape that opens to the outer side of the outer layer side elastic member 24.

Further, the peripheral surface of the outer layer side elastic member 24 can be covered with a silicone-based paint 33 such as silicone oil containing the fine powder 32.
Examples of the fine powder 32 include calcium carbonate, magnesium carbonate, alumina, aluminum hydroxide, talc, clay, silica, kaolin, diatomaceous earth, mica, ritbon, barium sulfate, glass powder, antimony trioxide, chlorinated paraffin, and carborundum. Silica stone powder, benzophenone, polytetrafluoroethylene, polyethylene wax, and silicone resin particles can be used. Either inorganic powder or organic powder may be used.
As the silicone type paint 33, it is sufficient if it has a releasability or a releasability like the release agent 26, and it is preferable if it is the same type as the release agent 26. Any substance can be employed as long as it does not interfere with the peelability of the film.

    Also in the platen roller 30 having such a configuration, the release agent 26 of the inner layer side elastic member 23 passes through the slit 25 and the groove 31 and the outer layer side elastic member 24 similarly to the platen roller 20 (first embodiment, FIGS. 1 to 3). The release agent 26 that is supplied so as to exude to the peripheral surface of the platen roller 30 is continuously replenished with the use of the platen roller 30, and the platen roller 30 is non-adhesive or peelable (release property). Can be maintained over a long period of time.

In particular, since the groove 31 is formed in the slit outer end portion 25A of the slit 25, the release agent 26 temporarily stays in the groove 31, and the supply of the release agent 26 to the peripheral surface of the outer layer side elastic member 24 is performed. Can be stabilized.
Moreover, since the fine powder 32 is contained in the silicone type paint 33, the release agent 26 or the silicone type paint 33 can be stably held on the peripheral surface of the outer layer side elastic material 24, and the adhesive. Since the contact area with the agent layer 3 is reduced, the peelability can be further improved.

    5 is a perspective view of a platen roller 40 according to a third embodiment of the present invention, and FIG. 6 is a side view of the platen roller 40. The platen roller 40 includes the roller shaft 21 and an elastic material 41. In addition, the label 1 (FIG. 9) without the mount is brought into contact with the elastic member 41 and transferred.

    The elastic member 41 includes an inner layer side elastic member 42 provided on the outer periphery of the roller shaft 21 and an outer layer side elastic member 43 that is provided integrally on the outer periphery of the inner layer side elastic member 42 and contacts the mountless label 1. .

As shown in the drawing, the inner layer side elastic member 42 has an uneven outer periphery and is different from the outer periphery shape of the outer layer elastic member 43.
Specifically, the concavo-convex shape of the inner layer side elastic member 42 is a star shape in cross section along the radial direction of the roller shaft 21, and this cross sectional shape is the same star at any axial position of the roller shaft 21. It is a shape.
In the illustrated example, this star shape has eight peak portions 42A and eight valley portions 42B located between the peak portions 42A.

Further, the plurality of slits 25 (shown by dotted lines in FIG. 6) around the circumference along the axial direction of the roller shaft 21 from the outer layer side elastic material 43 to the inner layer side elastic material 42 and in a direction perpendicular to the axial direction. The elastic material 41 is divided into a plurality of unit elastic portions 41A, 41B, 41C,... That can be displaced independently of each other (FIGS. 5 and 7).
The slit interval W and the slit depth D of the slit 25 are the same as those of the platen roller 20 (FIG. 1, first example) and the platen roller 30 (FIG. 4, second example) described above. can do.

    For example, each slit 25 is cut into a part of the inner layer side elastic material 42 through the outer layer side elastic material 43. In the example shown in the figure, the slit 25 is cut to the peak portion 42A of the inner layer side elastic material 42 having the above-mentioned star-shaped uneven shape at a uniform depth in the elastic material 41, and does not reach the valley portion 42B. .

The inner layer side elastic member 42 is formed so that the A hardness of the inner layer side elastic member 42 is lower than the A hardness of the outer layer side elastic member 43 so that the inner layer side elastic member 42 is more elastically deformed than the outer layer side elastic member 43.
That is, a stronger elastic repulsive force is generated with respect to the pressing force (printing pressure) from the thermal head 16 in each of the unit elastic portions 41A, 41B, 41C, ... formed by the plurality of slits 25. It is desirable that the mountless label 1 that is transferred while being in contact with the platen roller 20 acts to peel off the surface of the platen roller 20.
The inner layer side elastic member 42 and the outer layer side elastic member 43, which are the main components of the platen roller 20, can be made of a synthetic resin material having an A hardness in the following range.
For example, the inner layer side elastic material 42 has an A hardness of 10 to 30 degrees, preferably 20 to 30 degrees, and the outer layer side elastic material 43 has an A hardness of 30 to 80 degrees, preferably 50 to 60 degrees.
When the A hardness of the inner layer side elastic member 42 is less than 10 degrees, the inner layer side elastic member 42 becomes too soft and each unit elastic portion 41A, 41B, 41C,... Has a necessary elastic force or repulsive force. It is difficult to obtain, and when it exceeds 30 degrees, it becomes hard on the contrary, and the unit elastic portions 41A, 41B, 41C,.
When the A layer hardness of the outer layer side elastic material 43 is less than 30 degrees, the contact friction force with the label 1 without the mount becomes excessive, and the transfer function as the platen roller 20 is hindered. It is difficult to transmit the repulsive force to the label 1 without the mount.

The transfer action of the label 1 without the mount 1 (FIG. 9) by the platen roller 40 having such a configuration and the supply action of the release agent 26 to the peripheral surface of the outer layer side elastic member 43 will be described with reference to FIGS.
FIG. 7 is an enlarged sectional view in the axial direction of the roller shaft 21 in a state in which the label 1 without the mount is sandwiched between the thermal head 16 and the platen roller 40 in the thermal printer 8 (FIG. 10), and FIG. FIG. However, in FIG. 7, the peak portion 42 </ b> A and the valley portion 42 </ b> B of the star-shaped inner-layer-side elastic member 42 are shown separately on the same drawing.

    As shown in FIGS. 7 and 8, the label 1 without the mount is sandwiched between the thermal head 16 and the platen roller 40, and the adhesive layer 3 is pressed against the platen roller 40 with a predetermined printing pressure (pressing force). It will be in the same state as if it was pasted.

First, the transfer action of the label 1 without the mount will be described. Since the platen roller 40 has a plurality of slits 25, the unit elastic portions 41 </ b> A that can be independently displaced and are divided by the respective slits 25 so as to be adjacent to each other. , 41B, 41C, 41D, 41E, 41F (located on the right side in FIG. 7), and unit elastic portions 41G, 41H, 41I, 41J, 41K (located on the left side in FIG. 7),. . Each show an independent behavior.
That is, each unit elastic part 41A-41F, 41G-41K is comprised from the inner layer side elastic material 42 and the outer layer side elastic material 43, but since the volume of the inner layer side elastic material 42 is slightly different, respectively. The amount of elastic deformation is different and it does not bend to the same shape.
In addition, when the boardless label 1 that has been printed is separated from the thermal head 16, the bent unit elastic portions 41A to 41F and 41G to 41K are in contact with each other, so there is a slight difference in frictional force. When returning to the original shape, the unit elastic portions 41A to 41F and 41G to 41K do not return to the same state at exactly the same timing, and the unitless labels 1 are separated from the platen according to the respective restoring forces. It pushes away from the roller 17.
The unit elastic portions 41G to 41K in which the slit 25 does not reach the inner layer side elastic material 42 are integrated with the adjacent unit elastic portions 41G to 41K at the base portion (inward side), but the end portions ( It is a separate body on the outer side), and although the repulsive force itself is reduced, it exerts a different restoring action while cooperating with each other, and similarly exerts a function of pushing the mountless label 1 away from the platen roller 17 .

Further, since the inner layer side elastic member 42 has a star-shaped uneven shape, the single unit elastic portions 41A to 41F and 41G to 41K are also separated from the thermal head 16 as the platen roller 40 rotates. The peeling function is ensured.
That is, as shown in FIGS. 7 and 8, the unit elastic portions 41A to 41F in which the volume of the inner layer side elastic member 42 having a relatively small A hardness is large, and the unit elastic portions 41G to 41K in which the volume of the inner layer side elastic member 42 is small. Then, even if the pressing force received from the platen roller 40 is the same, when the platen roller 40 is rotated so as to transport the label 1 without the mount, the unit elastic portions 41A to 41F are moved toward the unit elastic portions 41G to 41K. However, a relatively large repulsive force is generated.
The difference in the amount of restitution or restoration produced between the unit elastic portions 41A to 41F having a large volume of the inner layer side elastic member 42 and the unit elastic portions 41G to 41K having a small volume acts so that the label 1 without mount is easily peeled off, The label 1 without the backing paper does not stick to the platen roller 40.
In this way, the unit elastic portions 41A, 41B, 41C,..., 41G,... 41K push back the non-mounting label 1 separately, thereby improving the non-adhesiveness and releasing property of the platen roller 40, None The label 1 is not caught while the label 1 is stuck to the platen roller 40, or the traveling direction is bent and label clogging does not occur.

    Thus, when a printing medium having a multilayer structure such as a label 1 without mount or a label with mount is loaded into the thermal printer 8 for printing, the outer peripheral surface of the outer layer side elastic member 43 is a smooth curved surface, and the platen roller 40 is A print medium can be stably brought into contact with the entire surface of the thermal head 16, and a stable transfer printing operation can be ensured.

7 and 8, the unit elastic portions 41A to 41F of the platen roller 40 are described as unit elastic portions having a large volume of the inner layer side elastic material 42, and the unit elastic portions 41G to 41K are described as unit elastic portions having a small volume. However, this is a state that occurs instantaneously while being pressed by the thermal head 16, and the size of the volume changes one after another as the platen roller 40 rotates.
For example, when the platen roller 40 is slightly rotated counterclockwise from the illustrated state in FIG. 8, the peak portion 42A of the inner layer side elastic member 42 is shifted to the downstream side in the transport direction of the non-mounting label 1; The outer layer side elastic material in which the volume of the inner layer side elastic material 42 in the unit elastic portions 41A to 41F and 41G to 41K becomes smaller at the contact portion with the thermal head 16 where the printing pressure is generated with respect to the label 1 without the mount. Thus, the elastic repulsive force as described above by the unit elastic portions 41A to 41F and 41G to 41K changes.
In other words, since the surface of each of the unit elastic portions 41A to 41F and 41G to 41K operates independently so as to finely pulsate from the contact portion with the label 1 without mount to the downstream side, the surface of the platen roller 40 As a result of the non-mounting label 1 in the attached state being peeled off from the platen roller 40 autonomously and forcibly by non-uniform peeling force acting in the transport direction and width direction, the label is jammed. Can be properly transported without generating any.

Next, the action of supplying the release agent 26 to the peripheral surface of the outer layer side elastic member 43 will be described. The platen roller 20 (first embodiment, FIG. 1) and the platen roller 30 (second embodiment, FIG. Similarly to 4), the inner layer side elastic member 42 contains a release agent 26 such as silicone oil, and since the pressing force (printing pressure) from the thermal head 16 is applied, each elastic unit can be independently displaced. Due to the pumping action in the portions 41A to 41F and 41G to 41K, the release agent 26 can ooze out from the inner layer side elastic material 42 through the slit 25 onto the peripheral surface of the outer layer side elastic material 43.
However, the release agent 26 gradually exudes to the peripheral surface of the outer-layer-side elastic material 43 by the capillary phenomenon of the slit 25 formed from the inner-layer-side elastic material 42 to the outer-layer-side elastic material 43 even without the pumping action. Go.
Therefore, the release agent 26 that supplies the release agent 26 to the peripheral surface of the elastic material 41 (outer layer side elastic material 43) is supplied, and the peelability or non-adhesiveness as the platen roller 20 can be maintained over a long period of time. The stable transfer of the label 1 without the mount can be ensured.

    By adjusting the slit depth D of the slit 25, it is possible to change the cut amount (cross-sectional area) impregnated with the release agent 26 in the inner layer side elastic member 42, and thus the peripheral surface of the outer layer side elastic member 43. It is possible to adjust the exudation amount and exudation speed of the release agent 26 at each site.

    Further, like the platen roller 30 according to the second embodiment (FIG. 4), a structure in which a groove 31 communicating with the slit 25 is formed, or a silicone-based paint 33 such as silicone oil containing fine powder 32 is applied to the outer layer side elasticity. A configuration in which the peripheral surface of the material 43 is covered can also be adopted.

    The irregular shape of the inner layer side elastic member 42 in the third embodiment described above is not shown in the drawing, but the regularity in the radial direction or the axial direction of the roller shaft 21 is completely achieved in addition to the configuration as described above. It is also possible to adopt any shape that has been eliminated, or a shape in which a plurality of warts of a large or small size or a predetermined shape or height are projected, or any other shape that is a combination of a curved surface or a flat surface. As a roller or other elastic roller, the surface changes pulsatingly or irregularly as the pressing force is applied, and the belt-like member such as a non-mounting label is actively peeled off from the roller surface. Such a function can be provided.

1 Label without mount (band material without mount, Fig. 9)
DESCRIPTION OF SYMBOLS 1A Label piece of label 1 without mount 2 Label base material 3 Adhesive layer 4 Thermosensitive color-developer layer 5 Release agent layer 6 Position detection mark 7 Scheduled cutting line 8 Thermal printer (FIG. 10)
DESCRIPTION OF SYMBOLS 9 Supply part 10 Guide part 11 Detection part 12 Printing part 13 Cutting part 14 Guide roller (elastic body roller)
15 Position detection sensor 16 Thermal head 17 Platen roller (elastic body roller)
18 fixed blade 19 movable blade 20 platen roller (first embodiment, FIG. 1)
21 Roller shaft 22 Elastic material 22A, 22B, 22C, ... Unit elastic part (Figs. 3 and 4)
23 inner layer side elastic material 24 outer layer side elastic material 25 slit 25A slit outer end of slit 25 on outer layer side elastic material 24 side (FIG. 4)
26 Release agent 30 Platen roller (second embodiment, FIG. 4)
31 V-shaped groove 32 Fine powder 33 Silicone-type paint 40 Platen roller (third embodiment, FIG. 5)
41 elastic material 41A-41F, 41G-41K unit elastic part (FIG. 7)
42 Inner layer side elastic material 42A Peak portion 42B of inner layer side elastic material 42 Valley portion 43 of inner layer side elastic material 42 Outer layer side elastic material

Claims (9)

A roller shaft;
An elastic material attached around the roller shaft, and an elastic roller for transferring the elastic material in contact with the belt-shaped member,
The elastic material is
An inner layer side elastic material provided on the outer periphery of the roller shaft;
The outer layer side elastic material provided on the outer periphery of the inner layer side elastic material and in contact with the belt-shaped member, and
The inner layer side elastic material contains a release agent,
By forming a plurality of slits perpendicular to the axial direction of the roller shaft from the outer layer side elastic material to the inner layer side elastic material, the release agent for the inner layer side elastic material is formed. The elastic body roller can be oozed to the peripheral surface of the outer layer side elastic material through these slits. The inner layer side elastic material is formed from a material containing the release agent,
The elastic roller according to claim 1, wherein the outer layer side elastic material is formed of a material not containing the release agent.     The rubber hardness (hereinafter referred to as “A hardness”) according to durometer type A defined in JIS K6253 standard of the inner layer side elastic material is lower than the A hardness of the outer layer side elastic material. Elastic body roller. A hardness of the inner layer side elastic material is 10 to 30 degrees,
The elastic body roller according to any one of claims 1 to 3, wherein the outer layer side elastic material has an A hardness of 30 to 80 degrees.     5. The groove formed at the outer end of the slit on the outer-layer-side elastic material side in the slit so as to communicate with the slit and open on the peripheral surface of the outer-layer-side elastic material. The elastic roller according to any one of the above.     6. The elastic roller according to claim 1, wherein the peripheral surface of the outer layer side elastic material is covered with a silicone-based paint containing a fine powder.     The elastic roller according to any one of claims 1 to 6, wherein the inner layer side elastic material has an uneven outer periphery.     The elastic roller according to any one of claims 1 to 7, wherein the inner layer side elastic member has a star shape in a cross-sectional shape along a radial direction of the roller shaft. A roller shaft;
An elastic material attached around the roller shaft, and a release agent supply method to the elastic material circumferential surface in the elastic roller for transferring the elastic material in contact with the belt-shaped member,
The elastic material is
An inner layer side elastic material provided on the outer periphery of the roller shaft;
The outer layer side elastic material provided on the outer periphery of the inner layer side elastic material and in contact with the belt-shaped member, and
The inner layer side elastic material contains a release agent,
From the outer layer side elastic material to the inner layer side elastic material, by forming a plurality of slits perpendicular to the axial direction of the roller shaft along the axial direction of the roller shaft, the inner layer side elastic material of the inner layer side elastic material Exfoliate the release agent to the outer surface of the outer layer side elastic material through these slits,
The release agent is supplied to the peripheral surface of the elastic material, and the release agent is supplied to the peripheral surface of the elastic material.

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