JP3992856B2 - Printer paper supply mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper supply mechanism of a printer, and more particularly to a paper supply mechanism of a printer that pulls out a roll paper from a supply shaft such as a roll paper such as a tag / label.
[0002]
[Prior art]
Thermal printers can be used as printers that are used in supermarkets and department stores to print on paper such as labels and tags attached to products.
This thermal printer includes a supply shaft that rotatably holds a roll paper that is wound around a core and rolls the paper, and a printing unit that includes a platen roller and a thermal head.
Then, characters, prices, barcodes and the like are printed on the paper by the heat generation action of the thermal head while the roll paper is fed out and transported by rotation of the platen roller.
[0003]
Generally, paper such as labels and tags used in such printers can be classified into plain paper and thermal paper.
When printing on plain paper, the thermal head generates heat and transfers to plain paper via an ink ribbon attached to the printer. When printing on thermal paper, no ink ribbon is required. As described above, a heat-sensitive color is generated by the heat-sensitive color forming layer of the thermal paper to the heat generation action of the thermal head.
[0004]
However, since plain paper and thermal paper cannot be distinguished from each other by appearance, they may be loaded in the printer by mistake.
For example, small printers are aimed at miniaturization, so the mechanism of the ink ribbon is eliminated, so only thermal paper is used, but even if plain paper is accidentally loaded into such a printer and printing is issued. Since color printing is not performed, there is a problem that the operator misidentifies that the printer has failed.
[0005]
In addition, there is a method of manufacturing by printing a mark or the like to distinguish between plain paper and thermal paper on the paper itself, but this causes problems such as poor appearance and reduced product value when attached to the product.
[0006]
[Problems to be solved by the invention]
In view of the above problems, the present invention provides a printer paper supply mechanism that displays a warning message without performing a printing operation when a non-printable paper is loaded in a printer.
[0007]
[Means for Solving the Problems]
The present invention focuses on determining whether or not the paper is proper, and the gist of the invention of claim 1 is that a roll paper having a core and a cylindrical shape that fits and holds the core . In a paper supply mechanism of a printer comprising a supply shaft and a side plate member that rotatably supports the supply shaft, a cylindrical central shaft fixed to the side plate member via a cavity inside the supply shaft, and A cylindrical engagement member provided at least one on the outer peripheral surface of the supply shaft so as to be able to protrude and retract, and one end of the engagement member is projected from the outer peripheral surface of the supply shaft by a coil spring. By loading the core that is energized and does not have a hole into the supply shaft, one end of the engagement member is pressed by the previous core, and the other end of the engagement member is the center shaft So as to brake the rotation of the supply shaft In the paper feed mechanism of the printer, characterized in that the.
According to a second aspect of the present invention, there is provided a paper supply mechanism for a printer according to the first aspect, wherein an elastic member that abuts against the central shaft is provided at the other end of the engagement member .
According to a third aspect of the present invention, there is provided a paper supply mechanism for a printer according to the first aspect, wherein a detection sensor for detecting the rotation of the supply shaft is provided inward of the middle shaft.
[0008]
Therefore, the printer can issue a print by loading the appropriate thermal paper, and the engagement member provided on the supply shaft and the hole provided in the core do not fit by loading the incorrect paper. A braking force is applied so that the supply shaft does not rotate. Thus, since paper can not be transported, and a warning display as improper paper, does not have the printing operation, it can be readily known to a determination whether the appropriate paper operator accurately subsequent processing can do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
1 is a schematic explanatory view of the printer of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, FIG. 3 is a perspective view of a winding core, and FIG. It is.
[0010]
A label continuum 21 in which a plurality of labels L are temporarily attached to a belt-like mount 20 at a predetermined interval is wound around a core 18 described later to form a roll label continuum 22 (roll paper).
The label L is temporarily attached with thermal paper having a heat-sensitive color developing layer formed on the surface of the paper L as a base.
[0011]
The label printer 1 includes a supply unit 3, a guide roller 4, a printing unit 5, and a control unit (not shown), and a roll-shaped continuous label body 22 is rotatably fitted and held in the supply unit 3. A supply shaft 9 is provided at the rear part of the printer 1.
A printing unit 5 is disposed at the front of the printer 1, and includes a platen roller 7 and a thermal head 8, and the thermal head 8 is provided so as to be able to contact with and separate from the platen roller 7. The platen roller 7 is rotatably provided by driving a drive source (not shown).
[0012]
The guide roller 4 is disposed between the supply unit 3 and the printing unit 5, and a paper sensor 6 is disposed in the vicinity of the guide roller 4.
The sheet sensor 6 is provided with detection marks (not shown) at predetermined intervals on the surface opposite to the surface on which the label L of the belt-like mount 20 is temporarily attached, and a sensor for detecting the detection marks. Based on the detection result of the detection sensor, the label is stopped at a predetermined printing position.
Further, a guide plate (not shown) for guiding the label continuous body 21 along a predetermined transfer path may be provided between the guide roller 4 and the printing unit 5.
[0013]
The supply shaft 9 is made of plastic or synthetic resin. A cylindrical intermediate shaft 11 that does not contact the outer periphery of the supply shaft 9 is provided inside the supply shaft 9 via the cavity 10. While being fixed to the side plate 2, the supply shaft 9 is rotatably provided on the side plate 2.
Although not shown, a detection sensor for detecting the rotation of the supply shaft 9 is provided. A preferable position of the detection sensor is that a detection hole (not shown) is provided in the middle shaft 11 and a detection sensor (not shown) is provided inside the middle shaft 11 to rotate the supply shaft 9 through the detection hole. Detect.
A through hole 12 is provided at a predetermined position on the outer peripheral surface of the supply shaft 9, and an engagement member 14 that can be protruded and retracted from the outer peripheral surface of the supply shaft 9 is provided in the through hole 12.
[0014]
The body portion of the engaging member 14 has a substantially cylindrical shape, one end of which is a semi-spherical shape, and can protrude and retract from the outer peripheral surface of the supply shaft 9 (arrow in FIG. 2). The insertability of the core 18 is improved. The other end has a planar shape.
In the engaging member 14, the washer 15 is fixed in the vicinity of the semicircular spherical side, and the washer 15 is brought into contact with the outer peripheral surface of the supply shaft 9 so that the engaging member 14 does not fall off.
[0015]
A coil spring 16 is fitted into the engaging member 14, one abutting against the washer 15 and the other abutting against the inner peripheral surface of the supply shaft 9 to supply the semispherical portion of the engaging member 14. The shaft 9 is biased so as to protrude from the outer peripheral surface. When the semicircular spherical portion of the engaging member 14 is pressed, the engaging member 14 is pressed inward of the supply shaft 9, and the flat portion of the engaging member 14 and the middle shaft 11 come into contact with each other, so that the supply shaft 9. rotation are to control the dynamic be so that to. A member having a frictional force on the rubber-based surface, which is an elastic body, may be provided on the flat portion of the engaging member 14.
[0016]
With this configuration, when the roll paper 22 wound with the thermal paper as a label is loaded on the supply shaft 9 of the printer 1, the semicircular spherical portion of the engaging member 14 and the hole portion 19 of the winding core 18 are formed. Since it is engaged, the supply shaft 9 rotates as the label continuous body 21 is transferred.
Further, when a winding core (without a hole) on which plain paper is wound is loaded, the semicircular portion of the engaging member 14 of the supply shaft 9 is pressed and the engaging member 14 and the middle shaft 11 come into contact with each other. The braking force increases so that 9 does not rotate, making it difficult to rotate.
[0017]
Accordingly, since the detection sensor (not shown) does not detect the rotation of the supply shaft 14 because the supply shaft 9 does not rotate, the operation can be performed by displaying a warning display such as “use thermal paper”. Since the person notices that the paper is plain paper, the proper thermal paper can be loaded into the printer.
[0018]
As described above, when the detection sensor that detects the rotation of the supply shaft 9 by pressing the start key of the printer 1 operation unit (not shown) detects the rotation of the supply shaft 9 at a predetermined timing, the control unit ( By supplying a signal to a not-shown signal, a print issuance signal is waited for, and printing is issued by a print signal.
Further, when the detection sensor cannot detect the rotation of the supply shaft 9, it does not supply a signal to the control unit, so that a warning is displayed and the operation stops.
[0019]
Accordingly, the printer 1 can issue a print by loading an appropriate thermal paper, and if a paper other than the thermal paper is loaded, a warning message indicating that the paper cannot be used and a print issuance operation are not performed. The judgment of the paper can be easily notified, and the subsequent processing can be performed accurately and practically.
[0020]
Although one hole portion 19 formed in the winding core 18 shown in the present embodiment is provided on one side in the width direction of the winding core 18, it may be provided on both the other side, in which case Alternatively, the core 18 may be loaded on the supply shaft 9 from any direction.
Further, in order to properly fit the engaging member 14 and the hole 19 of the core 18, an alignment mark may be preferably provided on the engaging member 14 and the core 18.
[0021]
In the embodiment of the present invention, an example using thermal paper is shown. However, in a printer dedicated to plain paper, plain paper may be wound around the core of the present invention.
Moreover, although the label continuous body has been described as the roll paper, any paper that can be printed, such as a tag for a tag, can be adopted.
[0022]
【The invention's effect】
As described above in detail, the present invention can easily notify the operator of whether or not the paper is appropriate, and if an inappropriate paper is loaded in the printer, a warning is displayed. It can be judged whether it is appropriate or not.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram of a printer of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a perspective view of the core of the present invention.
FIG. 4 is a perspective view of a roll-shaped label continuous body.
[Explanation of symbols]
1 Printer
2 side plate 9 supply shaft 10 cavity
11 Central shaft 12 Through hole 14 Engaging member 15 Washer 16 Coil spring 18 Core 19 Hole 22 Roll-shaped label continuous body (roll paper)
L label

Claims (3)

In a paper supply mechanism of a printer comprising a roll paper having a winding core, a cylindrical supply shaft that fits and holds the winding core, and a side plate member that rotatably supports the supply shaft.
A cylindrical middle shaft fixed to the side plate member via a cavity inside the supply shaft;
A columnar engagement member provided on at least one of the outer peripheral surfaces of the supply shaft so as to freely protrude and retract ,
One end of the engaging member is urged by a coil spring so as to protrude from the outer peripheral surface of the supply shaft, and the winding core having no hole is loaded into the supply shaft.
A printer according to claim 1, wherein one end portion of the engagement member is pressed by a previous core, and the other end portion of the engagement member abuts on the middle shaft to brake the rotation of the supply shaft . Paper supply mechanism. The elastic member which contact | abuts to the said center axis | shaft was provided in the other end part of the said engagement member, The feature characterized by the above-mentioned. 1 The paper supply mechanism of the printer described. 2. The paper supply mechanism for a printer according to claim 1, wherein a detection sensor for detecting rotation of the supply shaft is provided inward of the middle shaft.

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