JP2584568B2 - Threading device for thermal printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal printer for printing on a tag such as a price tag with a thread, which is pulled out from a threaded tag roll wound with a thread near one side edge and fed to a printing section. The present invention relates to a thread removing device that removes a thread on a tag to be removed.

[0002]

2. Description of the Related Art Conventionally, as a thermal printer provided with a thread removing device for removing a thread on a tag, for example, there is a thermal printer as shown in FIGS. In brief, the collar 2 is rotatably fitted to the support shaft 1 shown in FIG. 17, and the roll holder 4 and the boss 5 are fixed to the collar 2 on both sides of the center portion of the rear roll holding plate 3. Each center hole is fitted, and the boss 5 is fixed to the collar 2 with the screw 6, so that the position of the rear roll pressing plate 3 in the axial direction (left and right direction in FIG. 17) with respect to the collar 2 is determined.

[0003] A tag roll 7 formed by winding a tag 10 having a large number of threads 9 near one side edge used for a price tag with a thread or the like around a core 8 in a roll shape on the roll holder 4. Insert as shown,
Another front roll holding plate 11 is attached to the thread 9 side of the tag roll 7 by inserting a hole 11a formed in the center portion into the collar 2, and the front roll holding plate 11 passes through the thread 9 through the thread 9. By pressing the entire tag roll 7, the rear surface 7a of the tag roll 7 is
In this state, the boss 12 fixed integrally with the front roll holding plate 11 is fastened with the screw 13 to be fixed to the collar 2.

Accordingly, the tag roll 7 is sandwiched between the front and rear roll holding plates 11 and 3, and is unified with the roll holder 4, the collar 2, etc. without breaking the winding.
Rotate against. Then, the tags 10 of the tag roll 7 thus held are sequentially pulled out from one end side as shown in FIG. 18, and are conveyed in the direction of arrow A while being sandwiched between the thermal head 21 and the platen 22.

In the transporting process, the tag 10 is guided in the direction of arrow A along the paper guide roller 14, and the thread 9 is removed from the printing surface 10a of the tag 10 by the thread removing brush 15 of the thread removing device. 10 hangs outside.

The thread 9 of the hanging tag 10 is fed to paper guides 17 and 18 for determining the transport position of the tag in the paper width direction.
Is reached, the sheet is sandwiched between them, so that it can ride on the corner of the printing surface 10a again. Then, in this state, the tag 10 is sandwiched between the thermal head 21 and the platen 22 via the ink ribbon 19, and predetermined printing is performed on the printing surface 10a in the printing unit. The paper guides 17 and 18 are fixed on the paper guide 17 side, and the paper guide 18 side is a movable paper guide that can be moved and adjusted in the paper width direction.

[0007]

However, in such a conventional thread removing device of a thermal printer, the thread on the tag sequentially pulled out from the tag roll is removed after passing through the paper guide roller. Since the brush was brushed off the tag print surface, the yarn on the tag was pressed against the tag print surface when passing through the paper guide rollers, causing the yarn to become entangled with the tag. There is a possibility that a notch formed in the side edge at equal intervals along the conveyance direction may cause a conveyance failure or a printing failure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the yarn on the tag pulled out from the tag roll with the yarn is wiped off the tag as soon as possible, so that the yarn and the yarn or the yarn are removed. An object of the present invention is to prevent entanglement of the tag with the tag, that the thread is caught on a component on the transport path, and that the thread does not run over the print position on the tag, thereby preventing defective transport and defective printing. It is also an object of the present invention to release a thread from a tag wound on a tag roll into a notch formed on a side edge of the tag with a thread drawn from the tag roll. And

[0009]

According to the present invention, in order to achieve the above object, a tag pulled out from a tag roll is used in a thread wiper of a thermal printer as described above.
Formed with a pair of opposing members that are slidably slidable from the front and back near the tag roll so as to cross diagonally from the side edge
Only set the thread wiping member form, fulcrum and held to the rotating movable <br/> mainly to follow the thread wiper member to the change in the roll diameter of the tag roll, tags upper thread sweeping member of the pair above
Then , the thread is wiped off the tag by the thread removing member. Further, in the above-described threading device of the thermal printer, it is effective to form the threading member with a pair of bar members facing each other.

[0010]

According to the threading device of the thermal printer constructed as described above, the pair of threading members of the threading device are obliquely crossed from the side edge of the tag pulled out from the tag roll.
To be placed in earthenware pots <br/> by sandwiching possible front and back or et sliding in the vicinity of the tag roll, because the thread wiping member moves following the change in the roll diameter of the tag roll, the tag Always remove tags from tag rolls , even if the amount of
It is possible to draw a smooth, yarn on the tag can be brushed off by the thread wiper member.

Then, the thread from the tag wound on the tag roll is caught in the notch formed on the side edge of the tag pulled out from the tag roll by bringing the thread removing member as close as possible to the tag roll. Sometimes,
The tag can be removed from the tag while being released by the thread removing member. In addition, if the thread removing member is formed of a pair of bar members facing each other, it can be easily manufactured to have a desired shape.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a front view showing the overall configuration of a thermal printer provided with a thread wiping device according to the present invention, FIG. 2 is a perspective view showing first thread wiping means provided in the thermal printer together with a tag roll, and FIG. FIG. 3 is a longitudinal sectional view showing a state where the tag roll is held by a tag roll holding device 20.

As shown in FIG. 1, this thermal printer is provided with a threaded tag 10 (see FIG. 2 for details) from one end of a tag roll 7 held by a tag roll holding device 20 and rotatable in an arrow B direction. The tag 1 is sequentially pulled out, and is nipped and conveyed by a platen 22 and a line type thermal head 21 in the direction of arrow A, and the ink ribbon 1 moved from the supply ribbon 25 to the take-up ribbon 26 on the printing surface 10a of the tag 10
Use 9 to print.

As shown in FIG. 2, the tag roll 7 has a number of notches 23 formed on both side edges at equal intervals in order to be used for a price tag with a thread and a thread near one of the side edges. the yarn tagged 10 with a 9, in which wound continuously on the outer circumference of the ring-shaped core 8 shown in FIG.

As shown in FIG. 1, the tag roll holding device 2
On the transport path between the first thread 0 and the platen 22, thread removing members 91a, 9 for removing the thread 9 on the printing surface 10a of the tag 10 are provided.
1b, which will be described later in detail.
0, a guide roller 95 rotatable in the direction indicated by the arrow is provided, a tag end switch 33 for detecting the presence or absence of the tag 10 is provided downstream of the guide roller 95, and the notch 23 of the tag 10 is further provided downstream thereof (FIG. 2). ) Are provided, respectively.

Further, a paper guide plate 58, which is a guide member for guiding the tag 10 by bringing the side edge opposite to the side where the thread 9 is attached of the tag 10 into contact with the downstream side of the tag in the transport direction of the tag, in the transport direction of the tag. A tag guide means 35 provided movably and positionably in a direction perpendicular to the second direction, and a second thread removing means 4 for removing the thread 9 on the threaded tag downstream thereof.
0 is provided.

The tag roll holding device 20, the support shaft 38 which is fixed at one end to a horizontal state in the drawing to the printer side plates 36 of the main body side by a nut 37 shown in FIG. 3, the rear-side roll pressing of the disk-shaped (see FIG. 2) The center hole 39a of the plate 39 and the slide hole 41a of the boss 41 integrally fixed to the center portion of the right side surface in FIG. Screws 42 are screwed into screw holes formed in the radial direction on the support shaft 41 to fix them to the support shaft 38.
In the axial direction.

Further, receiving shafts 43, 43 (see also FIG. 1) are fixed at intervals above the same height with nuts 37 above the position where the support shaft 38 of the printer side plate 36 is fixed. A collar 44 is rotatably fitted to each end side, and E is provided at both ends in the longitudinal direction of the collar 44 to prevent displacement.
The rings 45, 45 are engaged with grooves formed in the receiving shaft 43 so that the collar 44 does not shift in the axial direction of the receiving shaft 43.

Then, holes 39b each having a diameter slightly larger than the outer diameter of the collar 44 are formed in the rear roll pressing plate 39 corresponding to the two collars 44, 44, respectively.
4 penetrates through the inside of the hole 39b with a slight gap so that the front end side projects from the left-side surface of the rear roll pressing plate 39 in FIG.

On the support shaft 38, a roll holder 47 having a disk-shaped front roll holding plate 46 corresponding to the back roll holding plate 39 is integrally fixed to the inner surface thereof.
Rotatably fits through the roll press plate 4
A knob 48 is integrally fixed to the outside of the central portion of 6 by a screw 49 penetrating the roll holder 47, whereby the front roll pressing plate 46, the roll holder 47 and the knob 48 are integrated.

Accordingly, the center hole 8a of the core 8 of the tag roll 7 is fitted into the outer periphery of the roll holder 47 in a state of being integrated with the front roll pressing plate 46 facing the thread 9 side of the threaded tag 10. Thereby, the entire tag roll 7 can be held.

A knob 4 integrated with the front roll pressing plate 46
8 has a through hole 48b extending from the outer periphery to the center hole 48a.
Are formed in the radial direction, in which a hard ball 52 is fixed to the lower end of a spring 51 and the hard ball 52 is always inserted into the center hole 4.
8a side (downward in FIG. 3) is provided with a plunger 50 which is pressed and urged, and the knob 48 is moved to the front roll holding plate 4
6, a plurality of hard balls 52 of the plunger 50 are formed at equal intervals on the distal end side of the support shaft 38 when the center hole 48a is fitted into the support shaft 38 and inserted to a predetermined set position shown in FIG. Are engaged with the corresponding grooves of the V-shaped ring groove 53 so that the position of the front roll pressing plate 46 is determined.

In this embodiment, as shown in FIG. 2, the front roll pressing plate 46 facing the thread 9 side of the tag 10 is provided with:
Three large windows 54 for thread escape are formed so that the thread 9 of the threaded tag 10 can be freely discharged outside the roll holding plate 46 on the front side thereof. When setting the tag roll 7 in the tag roll holding device 20, first, as shown in FIG. 4, the front roll pressing plate 46 is placed in a horizontal state so that the knob 48 is on the lower side, and the tag roll is placed thereon. 7 so that the thread 9 hangs down with the thread 9 on the lower side, and the inner peripheral surface 8a of the core 8
Into a roll holder 47 fixed to the front roll pressing plate 46 and set.

At this time, the front roll pressing plate 46
Since three large windows 54 are formed as described with reference to FIG. 2, the tag roll 7 has the thread 9 projecting from each of the windows 54 to the outside (the lower side in FIG. 4) of the front roll pressing plate 46. I do.

Next, the front roll holding plate 46 on which the tag roll 7 is set is raised vertically, and the center hole 48a is inserted into the support shaft 38 as shown in FIG.
The tag roll 7 is pushed until the rear surface 7a on the rear side comes into contact with the rear roll pressing plate 39. In this state, the hard roll 52 of the plunger 50 provided on the knob 48 integral with the front roll holding plate 46 engages with the ring groove 53 formed on the distal end side of the support shaft 38 so that the front roll holding is performed. After the position of the plate 46 is determined, the attachment of the tag roll 7 to the tag roll holding device 20 is completed.

According to the tag roll holding device 20, the roll holder 47 holding the tag roll 7 is attached to the tag 1 with thread.
0, which is integrally fixed to the front roll holding plate 46 facing the thread 9 side.
Even if the tag roll 7 is set as described above with only the base roll 6 removed and the other back roll holding plate 39 remaining on the main body side, the front roll holding plate 46 and the roll holder 47 are formed integrally. Since the threads 9 do not get caught between them, the threads 9 or the
The notch 23 (FIG. 2) does not get entangled or caught, so that the tag 10 can be pulled out smoothly.

Further, three large windows 54 are formed in the front roll holding plate 46 facing the yarn 9 side.
When the tag 10 is set, the thread 9 projects out of the window 54 to the outside of the front roll holding plate 46 as shown in FIG.
Because it is not pressed down by the, it can be pulled out more smoothly.

The tag roll 7 is provided on the inner peripheral surface 8 of the core 8.
In addition to being held by the portion a being fitted into the outer peripheral portion of the roll holder 47, the collars 44, 44 rotatably fitted to the outside of the two receiving shafts 43, 43 as shown in FIG. Also the inner peripheral surface 8 on the upper side of the core 8
Since the portion "a" is held by being placed, even if the width W of the tag 10 is significantly wider than the width W1 of the roll holder 47 in FIG. 3, for example, the tag 10 having the width W is wound. By setting the inner peripheral surface 8a of the core (width corresponding to the width W) on the collars 44, 44, the set position of the entire tag roll 7 does not tilt so much as to cause inconvenience.

As shown in FIG. 1, the first threading means 90 is a threading member formed of a pair of opposing rod-like members which sandwich the tag 10 pulled out from the tag roll 7 from the front and back so as to be slidable. 91a and 91b, and the pair of thread wipers 91a and 91b are rotatably held with the screw 94 as a fulcrum following the change in the roll diameter D of the tag roll 7 shown in FIG. The thread 9 on the tag 10 is wiped off by 91a and 91b.

The thread removing members 91a and 91b are integrally rod-shaped members at the rear end side, and the rear end portions are integrally fixed to the mounting plate 93 by mounting screws 92. In the meantime, the tags 10 are vertically arranged in parallel with an interval at which the tags 10 can be sandwiched.

Then, the two thread wipers 91a, 91
1b in the state of being attached to the device shown in FIG.
After extending two in parallel from the fixed portion of the mounting plate 93 in the direction of the front roll holding plate 46, the tag 10 pulled out from the tag roll 7 is bent so as to cross obliquely from the side edge, and further, its tip 91c. , 91d is folded once again in a direction away from the tag roll 7, so that the printing surface 10 of the tag 10 is attached to the tips 91c, 91d.
The thread 9 on a is prevented from being caught.

As shown in FIG. 5, an engagement groove 93a is formed in the mounting plate 93 which fixedly holds the thread removing members 91a and 91b.
Screw 9 that is rotatably attached to a fixing part (not shown)
4 is removably engaged with the annular groove 94a formed in the mounting member 93, and when the engagement is performed, the mounting plate 93 is connected to the pair of thread wipers 9
Together with 1a and 91b, it becomes possible to freely rotate between the position shown by the solid line and the virtual line in FIG. 1 with the screw 94 as a fulcrum.

In this embodiment, as shown in FIG. 2, the shape of the guide roller 95 is such that the diameter of the side of the tag 10 corresponding to the thread 9 is increased, and the guide roller 95 is tapered in such a manner that the taper becomes deeper as it goes further. When the tag 10 is conveyed in the direction indicated by the arrow A, the conveying force of the tag 10 in the direction indicated by the arrow E also acts. 6 and FIG. 7) so that it can be restricted to a predetermined position.

In this embodiment, the tag roll holding device 20
1 is pulled out from the tag roll 7 held in FIG.
After setting the tag 10 on the transport path shown in FIG.
The pair of thread wipers 91a and 91b of the thread wiper 90 are sandwiched from the front and back.

In this manner, the upper thread removing member 91
a comes into contact with the printing surface 10a by its own weight, and at this time, the thread removing member 91a always comes into contact with the upper surface of the thread side edge 10c of the tag 10 shown in FIG. When the tag 10 is conveyed in the direction indicated by the arrow A while the tag 10 is on the printing surface 10a, and reaches the position where the tag 10 comes into contact with the thread sweeping member 91a, it is squeezed as shown by the thread 9b and the thread sweeping member 91a Thread 9c is spread outside the point of contact between the wire and the side edge 10c.

The removed thread is transferred to the lower thread removing member 91.
b, while moving in the direction of arrow A,
As shown by d in FIG.
Is continued to be conveyed, falls off the thread removing member 91b and hangs down, and is conveyed in a state of being aligned with the side edge 10c of the tag 10 as indicated by the threads 9e and 9f.

Therefore, the thread 9 of the tag 10 gets caught on components such as the tag end switch 33 and the notch detection sensor 34 provided on the conveyance path, or runs over the printing position on the tag, resulting in poor printing. To prevent
The thread 9 can be prevented from being caught in the holding portion between the thermal head and the platen.

Next, the tag guide means 35 and the second thread removing means 40 will be described with reference to FIGS. The tag guide means 35 includes a paper guide plate 58 as shown in FIG.
And a paper pressing roller 67 or the like, which is a guide roller for applying a conveying force in a direction in which a rear end surface (side edge) of the side where the tag has no thread is brought into contact with the paper guide plate 58. The plate 58 is bent into an L-shape to form a paper receiving portion 58a.
And two guide pins 59, 59 are fixedly mounted on the back surface of the paper receiving portion 58a at an interval, and the guide pins 59, 59 are mounted on the base 61 in the paper width direction orthogonal to the tag conveying direction. It is movably fitted into the formed guide groove 61a.

A guide hole 62a formed in the center of a holding plate 62 having holding slide sheets 63, 63 adhered to the upper surfaces on both sides thereof is fitted into the guide pins 59, 59, and a guide hole 62a is formed under the holding plate 62. A pressing spring 64 having a diameter larger than the groove width of the guide hole 62a is further inserted into the portion protruding to the side, and the E ring 6
5 is fitted and held in an annular groove formed at the lower end of each guide pin 59, and the slide sheet 6 is held.
The sheet guide plate 3 is pressed against the lower surface of the base 61 by the urging force of the spring 64 to hold the paper guide plate 58 with a predetermined holding force and to be able to move along the guide groove 61a.

The paper guide plate 58 has a U-shaped shaft guide plate 6.
6 are integrally fixed, and an inverted L-shaped guide hole 66b is formed on one side surface 66a of the guide hole 66b.
A guide hole (FIG. 6)
Is formed, and a guide shaft 68 rotatably fitted to the paper holding roller 67 is fitted between the guide holes.

The guide shaft 68 is supported by a U-shaped holder 69 that surrounds the upper and both sides of the paper pressing roller 67. The upper surface of the holder 69 and a shaft guide plate 66 corresponding to the surface are provided. A compression spring 71 is provided between the compression spring 71 and the inner surface of the compression spring 71. Therefore, the paper holding roller 6
7 is pressed against the paper receiving portion 58a of the paper guide plate 58 with a predetermined pressing force via the holder 69 by the urging force of the compression spring 71, so that the tag 10 (see FIG. 2) can be sandwiched therebetween. It has become.

The guide hole 66b of the shaft guide plate 66 for supporting one of the guide shafts 68 has an inverted L-shape as described above. Therefore, when the paper holding roller 67 is set to the use position, the guide shaft 68 is inserted into the guide hole 6 shown in FIG.
6b. By doing so, the tag 10 can be sandwiched between the paper holding roller 67 and the paper receiving portion 58a.

On the other hand, when the tag 10 is set between the paper pressing roller 67 and the paper receiving portion 58a, the guide shaft 68 is set to the retracted position at the upper right end of the guide hole 66b in FIG. By doing so, a gap is formed between the paper pressing roller 67 and the paper receiving portion 58a, so that the tag 10 can be easily set therebetween.

The guide shaft 68 has a paper pressing roller 67.
When the tag 10 is in the above-mentioned use position where the tag 10 can be sandwiched between the paper receiving portion 58a and the paper receiving portion 58a, as shown in FIG. It is set to incline by θ.

Therefore, as shown in FIG. 8A, the tag 10 includes the thermal head 21 and the platen 22 (both in FIG. 1).
) In the direction indicated by the arrow A in FIG.
The tag 10 is conveyed in the direction indicated by the arrow A while the tag 10 is being conveyed in the direction indicated by the arrow A, as shown in FIG. 58 side.

The holding force of the paper guide plate 58 on the base 61 (FIG. 6) is larger than the component force f2, and the spring pressure of the holding spring 64 and the friction coefficient of the holding slide sheet 63 described with reference to FIG. Is set, the paper guide plate 58 does not move even when this component force f2 acts. Therefore, the position of the rear end surface 10b of the tag 10 can be regulated along the guide surface 58b of the paper guide plate 58. .

The second thread wiping means 40 is movable between a thread wiping position indicated by a solid line in FIG. 7B and a retracting position (a position indicated by a phantom line) away from the yarn wiping position.
A brush 72 is provided, and the second brush 72 is screwed and fixed to a brush holding bracket 73 which is long in the paper width direction orthogonal to the conveying direction of the tag 10 as shown in FIG. A bracket 73 is fixed to the second brush shaft 74.

The second brush shaft 74 is rotatably mounted on the printer main body, and the end opposite to the brush holding bracket 73 penetrates the printer side plate 36, as shown in FIG.
(A) protrudes upward, and a positioning bracket 75 is integrally fixed to an end thereof.

Then, one end of a tension spring 76 is attached to the positioning bracket 75, and the other end is attached to the printer side plate 36 via a fixing pin 77, and the positioning bracket 75 is biased by the urging force of the tension spring 76. So that
The printer side plate 36 controls the position by bringing the urging force of the tension spring 76 into contact with the positioning bracket 75.
The stopper is fixed to the
The brush 72 can be moved between a thread-wiping position shown by a solid line in FIG. 7B and a retreat position shown by a virtual line.

Therefore, when the tag 10 is set, if the second brush 72 is set to the retracted position by means of the above-described tension spring 76 for retracting the second brush 72 away from the tag transport surface, the brush tip and the tag Since there is a gap between the print surface 10a (upper surface) and the tag 10, the tag 10 can be easily set there.

The second brush 72 works effectively when the thread 9 of the tag 10 is as light as a silk thread. That is,
In the case of a light thread such as a silk thread, the printing surface 10
The thread 9 once removed by the first thread removing means 90 (FIG. 2) from above may jump up onto the printing surface 10a again. In such a case, the second brush 7
2 removes the thread 9 again from the printing surface 10a,
It is possible to prevent the yarn 9 from being caught in the holding portion between the thermal head and the platen.

In the thermal printer, when printing is performed on the tag 10 with a thread, the hanging thread 9 of the tag 10 is more than the front wall 61b of the base 61 as shown in FIG. So that it is located on the near side (the lower side in the figure)
The paper guide plate 58 is set, and the back roll pressing plate 39 (FIG. 3) of the tag roll holding device 20 is set.

By doing so, the thread 9 that has been wiped off the printing surface 10a of the tag 10 by the first thread wiping means 90 hangs outside the front wall 61b as shown in FIG. Then, the sheet is conveyed along the front wall portion 61b to the holding portion between the thermal head 21 and the platen 22 shown in FIG.

Therefore, the thread 9 remains in a hanging state until the thread 9 reaches the position between the thermal head 21 and the platen 22. And the yarn 9 can be reliably prevented from being caught in the holding portion of the thermal head 21, so that the conveyance failure caused by the yarn 9 being caught or the printing surface 1 of the tag 10 can be prevented.
It is possible to reliably prevent a printing failure that occurs when printing is performed in a state where the thread 9 rests on 0a.

The platen 22 is, as shown in FIG.
The tag 10 is sandwiched between the rubber roller portion 79 and the thermal head 21 via an ink ribbon 19 (see FIG. 1).

At this time, in order to prevent the thread 9 from being caught between the rubber roller portion 79 and the thermal head 21, the tag 10 has a step H between the rubber roller portion 79 and the core bar 78. It is necessary to pass through a stepped portion 81 which is formed and has a length in the axial direction . For this purpose, the distance L1 between the rear end face 10b of the tag 10 (see also FIG. 7) and the end face of the rubber roller portion 79 of the platen 22 is always kept constant, and the thread 9 is not put on the print face 10a of the tag 10. It is necessary to convey the tag 10 during the operation.

Therefore, in this embodiment, in order to keep the distance L1 constant at all times, the back roll pressing plate 39 described in FIG. 3 and the tag guide means 35 described in FIG. The means 90 and the second thread wiping means 40 prevent the thread 9 from getting on the printing surface 10a.

FIG. 10 shows an embodiment in which the first thread wiping means 90 is arranged close to the tag roll 7 so that the thread caught in the notch of the tag can be released. Corresponding parts are denoted by the same reference numerals. In this embodiment, the first threading means 90 is disposed as close as possible to the tag roll 7 and the thread 9 of the tag 10 is disposed.
However, even if the tag 10 is caught in the notch 23 of the tag 10 as shown by the thread 9g in FIGS. 11 and 12, the thread can be removed from the printing surface 10a while being released by the thread removing member 91a.

That is, when the tag roll 7 is an inner roll (a tag roll wound so that the printing surface 10a is on the inside) as shown in FIG.
When the tag 9 is caught in the notch 23 of the tag 10 like the thread 9g shown in the conceptual diagram, the tag 9 is pulled by the tag 10 being conveyed in the direction of the arrow A to form a tension portion te shown in FIG. .

However, in this embodiment, as shown in FIG. 10, the thread wipers 91a and 91b of the first thread wiper 90 are used.
Are arranged close to the tag roll 7, so that the tag 1
When the strut portion te comes into contact with the inclined portion 91e of the thread removing member 91a with the movement in the direction of arrow A of FIG.
As shown in FIG. 2, it is extruded in the direction of arrow G. Therefore, the thread 9g caught in the notch 23 can be released, and the thread can be removed from the printing surface 10a.

FIG. 13 shows an embodiment in which the tag roll is wound outside, and portions corresponding to those in FIG. 10 are denoted by the same reference numerals. As described above, when the tag roll 7 'is an externally wound roll (a tag roll wound so that the printing surface 10a is on the outside), the thread 9 is hooked on the notch 23 of the tag 10 as shown in the conceptual diagram of FIG. Then, the thread 9 is pulled by the tag 10 being conveyed in the direction indicated by the arrow A, and a tension portion te shown in FIG. 13 is formed.

However, since the thread wiping members 91a and 91b of the first thread wiping means 90 are arranged close to the tag roll 7 ', as the tag 10 moves in the direction indicated by the arrow A, the projecting portions are formed. te is the inclined portion 91 of the thread wiper 91b.
When it touches f, it is pushed out of the notch 23 as in the case described in FIG. FIG. 14 shows an embodiment in which the thread caught in the notch of the tag can be released even if the roll diameter of the tag roll becomes small.
The portions corresponding to are denoted by the same reference numerals.

These thread removing members 97a and 97b
An extension 97c is provided at an intermediate portion of the thread removing members 91a and 91b so that the leading end of the thread removing member 91a and 91b can enter the direction approaching the tag roll 7 'and cross the tag 10 obliquely. , 97d are different.

By providing the extension portions 97c and 97d in this way, even if the roll diameter D1 of the tag roll 7 'is reduced to D2 by the decrease of the tag 10, as shown in the conceptual diagram of FIG. 97b is the extension part 97c, 9
7d allows the leading end side to follow the tag roll 7 'having a smaller diameter without interfering with the front roll holding plate 46, so that the thread 9 caught in the notch 23 of the tag 10 can be released regardless of the roll diameter. Along with it, print surface 1
0a can be paid off.

[0065]

As described above, according to the present invention, even if the thread wiping member is disposed upstream of the guide roller for guiding the tag pulled out from the tag roll in the transport direction, the tag can be removed. As the roll diameter of the tag roll becomes smaller as a result of the use of the tag roll, the thread wiper follows the tag roll and moves with the tag sandwiched from the front and back. Can be removed from the tag by the thread wiper early before it is pressed onto the tag, so that it is possible to prevent the thread from becoming entangled or the thread from being caught on the tag, and to prevent the thread from being caught on the tag. It is possible to prevent a print defect from occurring when the print position is reached.

When the thread removing member was moved as close to the tag roll as possible, the thread from the tag wound on the tag roll was caught in the notch formed on the side edge of the tag pulled out from the tag roll. Even in this case, the tag can be removed from the tag while being released by the thread removing member. In addition, if the thread removing member is formed of a pair of bar members facing each other, it can be easily manufactured to have a desired shape.

[Brief description of the drawings]

FIG. 1 is a front view showing the overall configuration of a thermal printer provided with a thread removing device according to the present invention.

FIG. 2 is a perspective view showing a first thread wiping unit 90 provided in the thermal printer together with the tag roll 7;

FIG. 3 is a longitudinal sectional view showing a state in which the tag roll 7 is held by a tag roll holding device 20.

FIG. 4 is a schematic diagram for explaining a procedure for setting a tag roll with a thread 7 in the tag roll holding device 20;

FIG. 5 is an exploded perspective view of the first thread removing means 90 of FIG. 2;

FIG. 6 is an exploded perspective view showing the tag guide means 35 provided in the thermal printer of FIG.

FIG. 7 is a diagram showing the tag guide means 35 and the second thread wiping means 40 together with the vicinity thereof in two planes, a plane and a front.

FIG. 8 is a plan view showing stepwise how the tag guide means 35 conveys the tag while pressing the back end face 10b thereof against the paper guide plate 58;

9 is a left side view showing a state in which the tag 10 is nipped and conveyed by a thermal head 21 and a platen 22 provided in the thermal printer of FIG.

FIG. 10 is a perspective view showing an embodiment in which the first thread removing means 90 is arranged close to the tag roll 7;

FIG. 11 is a conceptual view showing a state in which a tag thread 9g is hooked on a notch 23.

FIG. 12 is a plan view for explaining a state in which the thread caught in the notch of the tag is released by the thread removing means.

FIG. 13 is a perspective view showing an embodiment when the first thread removing means 90 of FIG. 10 is set on an externally wound tag roll.

FIG. 14 is a perspective view showing an embodiment in which a thread caught in a notch of a tag can be released even when the roll diameter of the tag roll becomes small.

FIG. 15 is a conceptual diagram showing a state in which the thread 9 of the tag is hooked on the notch 23 in the embodiment of FIG.

FIG. 16 shows a thread wiper 97a, 9 according to the embodiment of FIG.
FIG. 7b is a conceptual diagram for explaining how the tag roll 7b can follow even when the roll diameter of the tag roll 7 'is small.

FIG. 17 is a longitudinal sectional view showing a tag roll holding device of a conventional thermal printer.

FIG. 18 is an external perspective view showing a thermal printer to which the tag roll holding device is attached.

[Explanation of symbols]

7, 7 'tag roll 9 thread 10 tag 10a printing surface 21 thermal head 22 platen 40 second thread removing means 90 first thread removing means 93 mounting plate 94 screw 91a, 91b, 97a, 97b thread removing member

Claims (2)

(57) [Claims] 1. A yarn removing device for a thermal printer, which removes a yarn on a tag which is pulled out from a tag roll provided with a yarn and wound around one side edge and fed to a printing unit. The tag pulled out from the tag roll is slanted from the side edge.
Only set the thread wiping member formed of a pair of members facing each other sandwiching the slidably contact the front and back in the vicinity of the tag roll across, to follow the yarn sweep member to the change in the roll diameter of the tag roll fulcrum rotates movably held about the front
The upper threading member of the pair is brought into contact with the tag.
Allowed, thread wiping device of the thermal printer being characterized in that so as to shake off the yarn on the tag by thread sweep member. 2. A thread removing device for a thermal printer according to claim 1, wherein said thread removing member is formed of a pair of bar members facing each other.