JPH09174893A - Label printer without release sheet - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] Since only the pressure-sensitive adhesive layer 5 is provided on the back surface of the label 1 without a release sheet, when the label 1 is wound in a roll shape, the pressure-sensitive adhesive layer 5 forms the label. In order to stick to the surface, a peelable coating film 4 such as silicon is applied to the surface of this label. However, at the time of printing, this coating film dust adheres to the thermal head and the printing effect is poor. SOLUTION: When printing a label 1 without a release sheet wound in a roll, a protective film 6 is provided so as to surround a pressure contact surface of a thermal head 10 opposed to a platen roller 11, and the label 1 without a release sheet. By sandwiching between the thermal head 10 and the platen roller 11 with the protective film 6 interposed therebetween for printing, silicon dust on the label surface side does not adhere to the thermal head 10 and clear printing is obtained on the label.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label printing apparatus having no release sheet.

[0002]

2. Description of the Related Art As shown in FIGS. 6 and 7, a conventional label continuum 50 includes a label 5 having a division cut line 56.
A pressure-sensitive adhesive layer 52 is provided on the back surface side of No. 1, and a strip-shaped release sheet 53 is attached to this layer. A thermosensitive color former layer 54 is provided on the front surface side of the label 51, and the label 51 is wound into a roll and set in a printer. Then, the label continuum 50 is heated by the thermal head of the printer to cause the thermosensitive color former layer 54 of the label 51 to develop color, and after the desired printing 55 is performed, the label 51 is transferred by the turning action of the release sheet 53. Attach it to the product.

[0003]

However, in such a label continuous body 50, after the label 51 is applied, the release sheet 53 remains, and it is not only time-consuming to dispose of it as dust, but also waste of resources is required. Also becomes. Furthermore, this release sheet has a defect that the cost is higher than that of the label substrate and the cost of the entire label is high. Therefore, the release sheet 53
So-called strip-shaped labels without a release sheet have been developed. In such a band-shaped label, since the adhesive layer is present on the back surface, when it is wound in a roll, the adhesive is attached to the inner label surfaces that overlap each other, so a non-adhesive material such as silicone Removable coating film dust coated with the above, residual glue dust, label paper dust, and the like adhere to the thermal head, and in particular, defects occur in bar code printing. It is an object of the present invention to prevent such coating dust, residual glue dust, and paper dust from adhering to the thermal head and to provide clear printing.

[0004]

In order to achieve the above-mentioned object, the present invention has a thermosensitive color developing agent layer 3 which sequentially develops color by heat on the surface side of a label substrate 2 and a releasability of silicon or the like on this surface. In a printing apparatus for a label 1 without a release sheet, which is provided with a coating film 4 and only the pressure-sensitive adhesive layer 5 is provided on the back surface side of the label base material 2, the label 1 without a release sheet is wound in a roll shape to form a printer. When the label 1 is set and printing is performed on the label 1, a thin protective film 6 is interposed between the thermal head 10 which is a printing means of the printer and the platen roller 11 to directly heat the label 1 without the release sheet. The head 10 is configured so as to print without contacting the head 10. In this way, since the peelable coating film 4 such as silicon, which is located on the front surface side of the label base material 2, does not directly contact the thermal head 10, the thermal head is coated with this coating residue, and further the back surface of the label base material 2. Since the adhesive dust on the side and the paper dust of the label itself do not adhere, clear printing can be performed on the label. Further, the protective film 6 is configured such that the label substrate 2 is surface-endlessly fed, a carbon ribbon or the like is fed, or the label substrate 2 is laminated on the surface of the label substrate 2.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An outline of a printer for a label without a release sheet of the present invention is shown in FIGS. 3, 4 and 5.
Before describing this printing apparatus, the structure of the label 1 without a release sheet will be described first with reference to FIG. 1 showing a perspective view thereof and FIG. 2 showing a sectional view thereof. As is clear from the figure,
Label 1 without release sheet applied to the printer of the present invention
Has a thermosensitive color developing agent layer 3 sequentially on the surface side of the label substrate 2, and a peelable coating film 4 of silicon or the like on the surface. On the back side of the label substrate 2, only the pressure sensitive adhesive layer 5
There is no release sheet.

Thus, such a label 1 without a release sheet is wound into a roll and set in a printer as shown in FIG. In this case, the releasable coating film 4 applied to the front surface of the label 1 functions as a release sheet, and is wound around a roll to attach the pressure-sensitive adhesive layer 5 with adhesiveness applied to the back surface of the label 1. There is an effect to prevent. Therefore, although it is not adhered even when wound in a roll shape, defects such as a residue of the releasable coating film 4 such as silicon have a bad printing effect.

The present invention is a printer devised as a countermeasure to this problem, which will be described below in order. In FIG. 3 shown as the first embodiment, the label 1 without the release sheet is wound, loaded into a supply shaft 30 of a printer, passed through guide rollers 31 and 32, and a thermal head 10 serving as a printing means and a platen. Lead to the roller 11 part. Here, an endless protective film 6A in which the protective film 6 is suspended in an endless manner is provided so as to surround the pressure contact surface of the thermal head 10 above the printing means portion. Specifically, the endless protective film 6A is the platen roller 1
1 so as to protect the thermal head 10 provided opposite to
Located between the thermal head 10 and the platen roller 11, the drive roller 12 of the motor M and the pinch roller 13
It is a circulation system in which it is sandwiched between and and passes through the guide rollers 14, 15 and 16 and then returns to the drive roller 12 and the pinch roller 13.

Thus, the label 1 without release sheet is
The releasable coating film 4 of silicon or the like on the surface is in contact with the protective film 6A and does not directly contact the thermal head 10.
Does not adhere to. At this time, the printed state of the label 1 without the release sheet is the thermal head 1 with the protective film 6A interposed.
It is in a state of being sandwiched between 0 and the platen roller 11. Then, the heat from the thermal head 10 is transmitted to the label 1 through the protective film 6A, but the protective film 6 is extremely thin, so that the thermosensitive color developing agent layer 3 is sufficiently colored to form a desired barcode or the like. Is printed 3a (see FIG. 2).

Next, the label 1 is moved by the rotation of the platen 10 so that one label is transferred to the conveyor belt 1.
8 is conveyed and stopped temporarily. At the time of this stop, it is cut by the cutter means 17, and the cut single leaf label 1A is attached to the product by the pressure roller 19 provided in the front part of the printer. Next, description will be given with reference to FIG. 4 shown as the second embodiment. The difference from the first embodiment is only the means for supplying the protective film 6, and the other parts are the same, and therefore the same reference numerals are given and omitted. The supply means of the protective film 6B is a transfer type such as a carbon ribbon, that is, a feed supply,
Specifically, in the upper part of the printing means of the printer, the protective film 6 is passed from the supply shaft 20 via the guide roller 22 so as to surround the pressure contact surface of the thermal head 10, and the lower part thereof is passed through. It is a system in which it is wound around the winding shaft 21 via 23. As described above, even when the protective film 6B is fed, the peelable coating film 4 of the label 1 without a release sheet contacts the protective film 6B and does not directly contact the thermal head 10. It does not adhere to the thermal head 10.

Next, a description will be given with reference to FIG. 5 shown as the third embodiment. Similar to the second embodiment, the protective film 6 is a kind of feeding supply.
Is not wound and is laminated on the label 1 to form a single leaf laminate 1B. In this case, a thin adhesive layer is provided on the back surface of the protective film 6C to achieve adhesiveness. The protective film 6C is wound around the supply shaft 24 at the upper part of the printing means of the printer, guided to the lower part of the thermal head 10 via the guide roller 25. Thus, the release sheet-less label 1 is guided between the platen roller 11 and the thermal head 10 from the supply shaft 30 wound in a roll through the guide rollers 31 and 32 in the same manner as described above, and the protective film 6C is interposed. Then thermal printing is performed. Therefore, similarly to the above, since the label 1 also does not directly contact the thermal head 10 due to the interposition of the protective film 6C, the silicon dust or the like applied to the surface is not attached to the thermal head 10. Thus, the label covered with the protective film 6C adhered to the surface of the label 1 is
8 is conveyed to the top of the label 8, and is cut by the cutter means 17 in the length portion corresponding to one label to form the laminated single-leaf label 1B.

[0011]

As described above, according to the present invention, the label base material 2 has the thermosensitive color former layer 3 and the peelable coating film 4 such as silicon on the front surface side, and the pressure sensitive adhesive layer 5 on the back surface side. In the printing apparatus for the label 1 without the release sheet provided with only the protection film 6 so as to surround the pressure contact surface of the thermal head 10.
Is placed between the platen roller 11 and the thermal head 10, and the thermal head 10, the protective film 6, the label 1 without the release sheet, and the platen roller 11 are sequentially printed in order to print on the label without the release sheet. Since it is configured, the surface of the label without the release sheet does not directly contact the thermal head 10. Therefore, the coating film dust and the like formed on the surface of the label without the release sheet do not adhere to the thermal head, so that clear printing is performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a label without a release sheet used in a printing apparatus of the present invention is wound into a roll.

FIG. 2 is an enlarged cross-sectional view of a label without a release sheet of the same.

FIG. 3 is a schematic explanatory diagram of a first embodiment (endless type) of the printing apparatus of the present invention.

FIG. 4 is a schematic explanatory diagram of a second embodiment (transfer type) of the printing apparatus of the present invention.

FIG. 5 is a schematic explanatory diagram of a third embodiment (laminate type) of the printing apparatus of the present invention.

FIG. 6 is a perspective view of a conventional label with a release sheet wound in a roll shape.

FIG. 7 is an enlarged cross-sectional view of the same label with a release sheet.

[Explanation of symbols]

 1 Label without Release Sheet 1A Single Leaf Label 1B Laminate Single Leaf Label 2 Label Base Material 3 Thermosensitive Coloring Agent Layer 3a Printing 4 Peelable Coating (Silicone) 5 Pressure Sensitive Adhesive Layer 6 Protective Film 6A Endless Protective Film 6B Supply Protective Film 6C Laminate Protective film 10 Thermal head 11 Platen roller M Motor 12 Drive roller 13 Pinch roller 14, 15, 16, 22, 23, 25 Guide roller 17 Cutter means 18 Conveyor belt 19 Crimping roller 20, 24 Protective film supply shaft 21 Protective film Winding shaft 30 Label supply shaft 31, 32 Label guide roller

Claims (4)

[Claims] 1. A printing apparatus for a label without a release sheet, comprising a thermosensitive color former layer and a peelable coating film on the front surface side of a label substrate, and a pressure sensitive adhesive layer on the back surface side of the label substrate. The protective film is interposed between the platen roller and the thermal head so as to surround the pressure contact surface of the thermal head, the protective film, the label without the release sheet, and the release sheet without the release sheet in the positional relationship of the platen roller. A printer for a label without a release sheet, which is configured to print on a label. 2. The printing apparatus for a label without a release sheet according to claim 1, wherein the protective film is endlessly supplied to the surface of the label base material. 3. The printing of a label without a release sheet according to claim 1, wherein the protective film is configured to be supplied to the surface of the label base material from a supply shaft to a winding shaft in a carbon ribbon feeding state. apparatus. 4. A label without a release sheet according to claim 1, wherein a protective film having a thin adhesive layer on the back surface of the protective film is coated and adhered to the surface of the label substrate. Printing device.