JP2000327185A - Sheet winding mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent meandering, skewing, rupturing of a sheet to be wound as well as to prevent inferior separation of a label when using a sheet winding mechanism for winding a mount in a label printer, by winding a long sheet at a constant speed. SOLUTION: In this sheet winding mechanism the tip of a sheet is fixed to a winding core 11 having two grooves 16, 17 on the outer peripheral surface by a clip 12 having straight parts 19, 18 to be engaged with the grooves 16, 17, and the winding core 11 is rotated to wind the sheet. The length of the straight part 19 to be engaged with one groove 16 of two grooves 16, 17 is set larger than the maximum width of the paper to be used. The depth of the grooves 16, 17 is set to such values that parts of the outer peripheral surfaces of the straight parts 19, 18 engaged with the grooves 16, 17 are brought into internal-contact with a virtual circle in which the outer peripheral surface of the winding core 11 is formed. Therefore, since the sheet is wound along the virtual circle including the outer peripheral surface of the winding core 11, the sheet is wound at the approximately constant winding speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper winding mechanism for winding a long sheet.

[0002]

2. Description of the Related Art Conventionally, a paper winding mechanism for winding a long paper has a winding core having a cylindrical outer peripheral surface, and a clip for fixing the leading end of the paper to the winding core. There is something. An example of a winding core and a clip included in such a paper winding mechanism will be described with reference to FIGS.

FIG. 5 is a perspective view showing the appearance of the winding core 1 and the clip 2, FIG. 6 is a front view showing a state where the clip 2 is attached to the winding core 1, and FIG. 7 is a right side view thereof. The winding core 1 has a shaft portion 3 having a cylindrical outer peripheral surface, and two grooves 4 parallel to the axial center are provided at positions symmetrical with respect to the axis of the shaft portion 3. Is formed over.

The clip 2 is a substantially J-shaped linear member having linear portions 5 and 6 having different lengths at both ends, and the longer linear portion 6 is longer than the length of the shaft portion 3. have.
Each straight portion 5, 6 engages with the groove 4, respectively.

[0005] As shown in FIGS. 6 and 7, in the conventional paper take-up mechanism, the straight portions 5 and 6 of the clip 2 attached to the take-up core 1 are partially part of the outer periphery of the shaft 3. Project from the surface.

Such a paper take-up mechanism is provided, for example, in a label printer which prints a label having a glue surface on the back side of a printing surface attached to a long backing sheet, and peels off from the backing sheet to issue. Is used to wind up the backing paper from which the label has been peeled off.

[0007]

In the conventional paper take-up mechanism as shown in FIGS. 5 to 7, the straight portions 5, 6 of the clip 2 project from the outer peripheral surface of the shaft portion 3 of the take-up core 1. Therefore, the paper winding speed changes. For this reason, when this paper take-up mechanism is provided in a label printer and used for take-up of a backing sheet, the backing sheet is loosened or pulled. There is.

Further, at the position where the shorter linear portion 5 is engaged, there is a difference in the winding speed and the tensile force between the portion of the paper 3 on the outer peripheral surface of the shaft portion 3 and the portion on the linear portion 5. Therefore, it may meander or skew, and if the tensile force is large,
The portion of the sheet that hangs on the linear portion 5 is torn.

SUMMARY OF THE INVENTION It is a first object of the present invention to take up a long sheet of paper at a constant speed and to prevent a label peeling defect when the board is used in a label printer and the base paper is taken up.

It is a second object of the present invention to prevent meandering, skew, and tear of a sheet to be wound.

[0011]

According to a first aspect of the present invention, there is provided a sheet take-up mechanism for holding a sheet on a cylindrical outer peripheral surface and fixing a leading end of a long sheet to the take-up core. And a paper winding mechanism that rotates the winding core and winds the sheet, wherein a position symmetrical with respect to an axis of an outer peripheral surface of the winding core is parallel to the axis. The clip is a substantially J-shaped linear member in which both ends are engaged with the groove, and the clip is a linear portion that is parallel to each other and has different lengths. One of the two grooves with which the longer straight portion engages has a length equal to or greater than the maximum width of the paper used, and the groove engages with the groove. A part of the straight portion has a depth inscribed in a virtual circle on which the outer peripheral surface of the winding core is formed.

Therefore, even when the clip is attached, the paper wound around the winding core is wound substantially along the virtual circle including the outer peripheral surface of the winding core, so that the winding speed of the paper is kept substantially constant. It is. Therefore, when winding the backing sheet used in the label printer, the backing sheet is not loosened or pulled, so that it is possible to prevent the label peeling failure due to the loosening of the backing sheet at the start of the label peeling. Further, since the diameter of the core portion of the paper to be wound is substantially constant along the width direction of the paper, the paper does not meander or skew, and the short straight line portion of the clip is formed on the outer peripheral surface of the winding core. Does not protrude from
The paper over that part does not break.

According to a second aspect of the present invention, in the paper winding mechanism according to the first aspect, the one groove is formed in a flat portion in which a cylindrical outer peripheral surface of the winding core is chamfered. The longer straight portion of the straight portion of the clip has a length equal to or greater than the maximum width of the paper used.

Therefore, when removing the wound paper from the take-up core, a small gap is provided between the inner circumference of the paper and the outer circumference of the take-up core by removing the clip first. Therefore, the sheet can be easily removed from the winding core.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a paper winding mechanism according to the present invention will be described with reference to FIGS. 1 is a perspective view showing the appearance of the winding core 11 and the clip 12, FIG. 2 is a front view showing a state where the clip 12 is attached to the winding core 11, and FIG. 3 is a right side view thereof. Winding core 11
A shaft 13 having a cylindrical outer peripheral surface;
And an end plate 14 provided at one end of the sheet for positioning one side end of the sheet to be wound. The shaft portion 13 has a flat portion 15 formed by chamfering a part of the outer peripheral surface in parallel with the axial direction over the entire length of the shaft portion 13.
In the center of 5, a groove 16 is formed which extends in the axial direction over the entire length of the shaft portion 13. In addition, a groove 17 shorter than the groove 16 is formed at a position where the groove 16 on the outer peripheral surface of the shaft portion 13 is formed and a position symmetrical with respect to the axis of the shaft portion 13.

The clip 12 is formed by bending a linear member into a substantially J-shape. Both ends are straight portions 18 and 19 which are parallel to each other and have different lengths. The shorter straight section 18 engages the shorter groove 17,
The longer straight section 19 engages the longer groove 16. The longer straight portion 19 has a length equal to or longer than the length of the shaft portion 13.

Here, the groove 16 is formed so that a part of the outer peripheral surface of the linear portion 19 engaged with the groove 16 is a part of the shaft portion 1 indicated by an imaginary line in FIG.
3 is formed at a depth inscribed in the virtual circle including the outer peripheral surface. Similarly, the groove 17 has a straight portion 18 engaged with the groove 17.
Is formed to a depth inscribed in a virtual circle including the outer peripheral surface of the shaft portion 13 indicated by a virtual line in FIG.

The paper take-up mechanism having such a configuration is provided, for example, in a label printer 20 as shown in FIG. The label printer 20 houses a printer mechanism 22 in a main body case 21, has a liquid crystal display 23 on the main body case 21, and has a keyboard (not shown) on the upper surface of the main body case 21. A label issuing port 24 is provided on the front of the main body case 21.

The printer mechanism 22 includes a paper holding unit 27 that stores and holds the continuous paper 26 on which the label 25 is attached in a roll shape, and a continuous paper 26 that is held and pulled out by the paper holding unit 27. And a guide route 28 for guiding the vehicle to a predetermined route. In the middle of the guide path 28, a printing unit 31 including a platen 29 and a line thermal head 30 that are arranged to face each other with the guide path 28 interposed therebetween, and a release plate 32 located downstream of the printing unit 31 on the sheet transport path.
And are arranged. The take-up core 11 of the present invention is disposed at the end of the guide path 28 and takes up the continuous paper 26 after the label 25 has been peeled off.

In the label printer 20, the continuous paper 26 is guided and conveyed along the guide path 28 by rotating the platen 29, and is adhered to the continuous paper 26 by the line thermal head 30 which comes into contact with the platen 29 via the guide path 28. A predetermined item is printed on the label 25 thus printed. At the same time, the continuous paper 26 is wound by the take-up core 11, whereby the continuous paper 26 is bent at an acute angle by the release plate 32, the printed label 25 is peeled from the continuous paper 26, and the peeled label is removed. 25 is issued from the label issuing port 24.

In the paper winding mechanism of the present embodiment, a part of the outer peripheral surface of the linear portions 18 and 19 is inscribed in a virtual circle including the outer peripheral surface of the shaft portion 13 indicated by a virtual line in FIG. The winding speed becomes substantially constant. Therefore, the backing material to be wound is not loosened or pulled. Therefore, there is no inconvenience that the backing sheet is loosened at the start of the label peeling and the label is not peeled.

Further, since the shorter linear portion 18 does not protrude from the imaginary circle including the outer peripheral surface of the shaft portion 13, meandering, skew, and mounting are caused by the mounting on the linear portion protruding from the outer peripheral surface of the shaft portion 13. No tearing occurs.

When removing the wound backing from the winding core 11, first, the clip 12 is pulled out, and then the backing is removed from the winding core 11. By doing so, the shaft 13
Is provided with the flat portion 15, the length of the inner circumference of the wound backing sheet is longer than the length of the outer circumference of the shaft portion 13 including the flat portion 15, so that the inner circumferential surface of the wound backing sheet is provided. A minute gap is formed between the shaft and the outer peripheral surface of the shaft portion 13, so that the backing sheet can be easily pulled out. Therefore, the wound backing sheet can be easily pulled out from the winding core.

In this embodiment, the case in which the paper take-up mechanism is used in a label printer to wind up the backing paper has been described as an example. It may be used for winding a long sheet of paper.

[0025]

The paper winding mechanism according to the first aspect of the present invention
The groove formed on the outer peripheral surface of the winding core is formed so that a part of the linear portion of the clip engaged with the groove is inscribed in a virtual circle on which the outer peripheral surface of the winding core is formed. Therefore, even with the clip attached, the paper wound on the winding core is wound substantially along the virtual circle including the outer peripheral surface of the winding core, so that the winding speed of the paper is kept substantially constant, for example, When winding the backing sheet used in a label printer, the backing sheet does not become loose or pulled, so that the label is not loosened at the start of the label peeling, so that the label peeling failure does not occur. In addition, since the diameter of the core portion of the paper to be wound is substantially constant along the width direction of the paper, the paper can be wound straight without meandering or skewing.

According to a second aspect of the present invention, in the paper winding mechanism according to the first aspect of the present invention, the one groove is formed in a flat portion in which a cylindrical outer peripheral surface of the winding core is chamfered. Since the longer linear portion of the linear portion of the clip has a length equal to or greater than the maximum width of the paper to be used, when removing the wound paper from the winding core, the clip must be By removing the paper, a minute gap can be provided between the inner circumference of the paper and the outer circumference of the take-up core, so that the paper can be easily removed from the take-up core.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a winding core and a clip provided in an embodiment of a paper winding mechanism of the present invention.

FIG. 2 is a front view showing a state where a clip is attached to a winding core.

FIG. 3 is a right side view thereof.

FIG. 4 is a vertical right side view showing an example of a label printer provided with the paper take-up mechanism of the embodiment.

FIG. 5 is a perspective view showing the appearance of a take-up core and a clip included in an example of a conventional paper take-up mechanism.

FIG. 6 is a front view showing a state in which a clip is attached to a winding core.

FIG. 7 is a right side view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Winding core 12 Clip 15 Flat part 16 (One) groove 17 Groove 18 Linear part 19 (Longer) linear part

Claims (2)

[Claims] 1. A winding core for holding a sheet on a cylindrical outer peripheral surface and a clip for fixing a leading end of a long sheet to the winding core, and rotating the winding core to remove the sheet. In the paper winding mechanism for winding, at a position symmetrical with respect to an axis of an outer peripheral surface of the winding core,
The clip is a substantially J-shaped linear member in which two grooves parallel to the axis are formed, and the clip engages with the grooves at both ends and is a straight portion that is parallel to each other and has a different length. The one of the two grooves with which the longer linear part of the linear part of the clip engages has a length equal to or greater than the maximum width of the paper used, and the groove is A paper winding mechanism, wherein a part of the linear portion engaged with the groove has a depth inscribed in an imaginary circle on which an outer peripheral surface of the winding core is formed. 2. The one groove is formed in a flat portion in which a cylindrical outer peripheral surface of the winding core is chamfered, and a longer straight portion of the straight portion of the clip is used. The paper winding mechanism according to claim 1, wherein the paper winding mechanism has a length equal to or greater than a maximum width of the paper.