JP2001192154A - Paper feeder of label printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feeder of a label printer capable of preventing meandering, skewing and printing misregistration due to missetting of paper. SOLUTION: This label printer for printing for continuous form of labels, tags and the like, is provided with a supply core 18 for holding rolled continuous form, a pair of supply holders 19, 20 slidably fitted to the supply core and provided on both sides of the continuous form to determine the position of the continuous form, and a paper positioning mechanism capable of centering the paper when the paper is forced in by the supply holder on the paper insert side of the paired supply holders.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a paper feeder for a label printer which prints barcodes, tags, etc. on continuous paper.

[0002]

2. Description of the Related Art Conventionally, continuous paper on which bar codes, tags, and the like are printed is wound on a paper core, and the paper core is set on a supply core of a paper supply device. That is, the claw of the supply holder that supports the continuous paper from both sides is fitted to the latch provided on the supply core. To adjust the position of the supply holder, the supply holder installed on the back side of the supply core is visually positioned using equally spaced scales provided on the supply core, and then the paper is set. Was inserted into the supply core. The other supply holder is also positioned by fitting into a latch provided on the supply core.

In order to fix a paper core in which continuous paper is wound around a supply core, a roller or a leaf spring mounted on the supply core is set to a size matching the supply core and larger than the inner diameter of the paper core. ing. When the user sets continuous paper, the supply core is fixed to the paper by forcibly pushing the paper in such a way as to crush the paper tube.

[0004]

However, the pitch of the scales provided on the supply core is rough and difficult to see, making it difficult to set the position of the paper accurately. Also,
Since the nail of the supply holder fitted to the latch of the supply core is easily released, the position reproducibility when setting the next sheet is poor.

Further, when the paper core of the paper is fixed to the supply core, if the paper core of the paper is pushed in from the side, the winding state of the paper wound on the paper core does not collapse. However, when fixing the paper core to the supply core, if the outside of the paper is pushed in, the paper core part will not be pushed in due to resistance, so only the paper wound around the outside of the paper core will be pushed. The paper was pushed outward, and the wound state of the paper was broken.

[0006] As described above, if printing is started while the wound state of the paper is broken, the printing position shifts, meandering, skewing, printing shifts, and other problems have been caused.

The present invention has been made in view of the above points, and has as its object to meander, skew, and skew due to a mistake in setting a sheet.
It is an object of the present invention to provide a paper supply device for a label printer that can prevent the occurrence of print misalignment.

[0008]

According to a first aspect of the present invention, in a label printer for printing on continuous paper such as a label or a tag, the continuous paper wound in a roll shape has one end. And a pair of supply holders provided so as to be movable along the axial direction of the supply core and provided on both sides of the continuous paper to determine the position of the continuous paper. A paper positioning mechanism is provided, which can set the paper by centering when the paper is pushed in by the supply holder on the paper insertion side of the pair of supply holders.

Thus, the continuous paper can be easily adjusted to the center position only by pushing the supply holder (insertion side).

According to a second aspect of the present invention, there is provided a label printer for printing on continuous paper such as a label or a tag, wherein the supply core holds continuous paper wound in a roll shape on a paper tube. A pair of supply holders slidably mounted on the supply core and provided on both sides of the continuous paper to determine the position of the continuous paper, and a lever operated to fix the paper tube to the supply core. When the lever is moved to the fixed position, the roller moves so as to contact the inside of the paper tube, and when the lever is moved to the release position, the link mechanism moves the roller to the inside of the inner diameter of the paper tube. It is characterized by the following.

As described above, when the lever is operated to the fixed position, the roller moves so as to contact the inside of the paper tube, so that the paper tube can be securely fixed to the supply core. That is, since the direction of the roller is in the direction orthogonal to the rotation direction of the paper tube, the position of the roller does not shift even if the supply core rotates. Furthermore, specifically, even if the supply core rotates forward or backward, the relative position between the supply core and the paper core does not change.

According to a third aspect of the present invention, when the lever of the second aspect is moved to a fixed position, an elastic member attached to a side surface of the lever fixes the lever from the inside of the supply holder. It is characterized by the following.

As described above, when the lever is set at the fixed position,
Since the supply member is fixed from the inside of the supply holder by an elastic member attached to the side surface of the lever, the center position of the continuous paper set between the supply holders does not shift.

According to a fourth aspect of the present invention, when the lever according to the third aspect is operated to a fixed position, the mounting position of the elastic member is such that the continuous paper is inserted more than the fulcrum of the lever. It is characterized by being shifted toward the direction side.

As described above, when the lever is operated to the fixed position, the mounting position of the elastic member is located closer to the continuous paper insertion direction than the fulcrum of the lever. Can be stabilized. For this reason, the displacement of the supply holder can be eliminated.

According to a fifth aspect of the present invention, there is provided a paper supply device for a label printer, wherein the supply holder on the paper insertion side of the pair of supply holders according to the third aspect is located at the position of the supply holder on the paper insertion side due to a difference in width of continuous paper. The shape of the fixing portion is provided so that the elastic member can be fixed from the inside of the supply holder by the elastic member.

As described above, the fixing portion of the supply holder can be fixed from the inside of the supply holder by the elastic member even if the position of the supply holder on the paper insertion side moves due to the difference in the width of the continuous paper. Even if the width of the continuous paper is different, the position of the supply holder can be reliably fixed.

According to a sixth aspect of the present invention, when the lever according to the second aspect is tilted to the release position, the lever is lower than the height of the supply core and smaller than the inner diameter of the paper tube. Positioning the continuous core at the position facilitates insertion and removal of the continuous paper from the supply core.

By doing so, it is possible to easily insert and remove the continuous paper from the supply core.

According to a seventh aspect of the present invention, there is provided a paper supply device for a label printer, wherein the paper supply device is a device externally attached to a printer housing of the label printer, the center of the sensor itself, the center of the guide of the label printer, and the paper supply device. The printer is mounted on the printer housing via a position adjustment plate so that the center of the printer coincides with the center of the printer.

As described above, since the paper supply device is attached to the printer housing via the position adjusting plate, the center of the guide of the label printer and the center of the guide of the paper supply device can be matched.

According to a eighth aspect of the present invention, in the paper supply apparatus for a label printer, the paper positioning mechanism according to the first aspect,
A pinion disposed in the center of the supply holder and supported by the supply core; and a pinion disposed inside the supply core so as to be movable in the axial direction and meshing with the pinion with the pinion interposed therebetween and the pair of supply holders. A rack-pinion mechanism having a pair of racks connected to the rack.

By thus configuring the paper positioning mechanism with a rack-pinion mechanism, continuous paper can be accurately centered by a simple operation.

According to a ninth aspect of the present invention, there is provided a paper supply apparatus for a label printer, wherein the supply core according to the first aspect has an upper and lower divided structure, and a meshing portion is meshed in an uneven shape.

As described above, since the upper and lower supply cores, which are divided into two, engage with each other in an uneven manner, the supply cores can be reliably integrated.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a label printer having a four-color thermal head printing mechanism.
In FIG. 1, reference numeral 11 denotes a printer housing of a label printer that performs printing on continuous paper such as labels and tags. The printer housing 11 is provided with four thermal head printing mechanisms described later with reference to FIG.

On the front surface of the printer housing 11, an LCD display section 12, various switches 13, and a paper discharge port 14 are provided.

A paper supply device 15 for supplying continuous paper such as labels and tags is attached to the back of the printer housing 11. The holder block 16 of the paper supply device 15 is attached to the back of the printer housing 11 as described later with reference to FIG. A DC motor (not shown) is built in the holder block 16. The rotation of the DC motor is transmitted to the rotation shaft 17 via a gear.

A supply core 18 having a vertically divided structure is fitted on the rotating shaft 17. The detailed configuration of the supply core 18 will be described later with reference to FIG.

A pair of supply holders 19 and 20 are slidably attached to the supply core 18.
Of the pair of supply holders 19, 20, the supply holder (rear side) 19 on the holder block 16 side is fixed to one end of a rack and pinion mechanism R described later incorporated in the supply core 18. The other end of the rack and pinion mechanism R is configured to be able to be pushed in by a part of the supply holder (insertion side) 20. That is, the supply holders 19 and 20 are connected by the rack and pinion mechanism.
By sliding in a direction approaching or separating from each other, the continuous paper 21 indicated by a broken line is held at the center position between the supply holders 19 and 20.

The continuous paper 21 is wound around a paper tube 110 as described with reference to FIG. The inner diameter of the paper tube 110 is set to be slightly larger than the outer diameter of the supply core 18.

Therefore, a roller 22 is provided to lock the supply core 18 and the paper tube 110 so that the rotation of the supply core 18 can be transmitted to the paper tube.

The roller 22 is linked with a lever 23,
When the head of the roller 22 is retracted to a position retracted from the outer peripheral surface of the supply core 18 or protrudes from the outer peripheral surface of the supply core 18 to a position where the roller 22 bites into the paper tube 110 as shown in FIG. The paper tube 110 is locked at 18. The position of the lever 23 in FIG. 1 is at the locked position. The configuration between the lever 23 and the roller 22 will be described later with reference to FIGS.

Next, referring to FIG.
A brief description will be given of the four thermal head printing mechanisms housed in the printer.

In FIG. 2, a continuous paper 21 fixed to the supply core 18 has a paper transport path 32 formed through a paper guide 31.

A paper guide 3 is provided on the paper transport path 32.
2, a pair of rollers including a vinch roller 33 and a driving roller 34, a paper leading edge sensor 35 for detecting the leading edge of the paper, and thermal heads 36a to 36d are arranged in this order.

The platen 37 is located at a position facing the thermal heads 36a to 36d with the sheet transport path 32 interposed therebetween.
a to 37d are provided, respectively. Platen 37a
And 37b are driven by a platen motor 38a.
7c and 37d are driven by a platen motor 38b, respectively.

A roller 39 for supplying an ink ribbon is provided between the thermal head 36a and the platen roller 37a.
The black ink ribbon is supplied from a and is taken up by the ink ribbon take-up roller 39b.

Further, between the thermal head 36b and the platen roller 37b, an ink ribbon supply roller 4 is provided.
A cyan ink ribbon is supplied from 0a and is taken up by an ink ribbon take-up roller 40b.

Further, between the thermal head 36c and the platen roller 37c, an ink ribbon supply roller 4 is provided.
A magenta ink ribbon is supplied from 1a and is wound by an ink ribbon winding roller 41b.

Further, between the thermal head 36d and the platen roller 37d, an ink ribbon supply roller 4 is provided.
A yellow ink ribbon is supplied from 2a, and is taken up by an ink ribbon take-up roller 42b.

Reference numeral 43 denotes a drive motor for rotating the drive roller 34.

Next, a structure for attaching the holder block 16 to the back surface of the printer housing 11 will be described with reference to FIG.

In FIG. 3, a fixing plate 51 is attached to the back of the printer housing 11. This fixing plate 51
The four sides are bent so that a space is formed between the four sides of the printer housing 11.

The fixing plate 51 has long holes 54a to 54d which are long in the vertical direction.

Further, female screws 55a and 55b are engraved directly above the long holes 54a and 54b, respectively.
Immediately below c and 54d, female screws 55c and 55d are cut.

Further, a female screw 55e for fixing the holder block 16 is cut.

Further, a position adjusting plate 56 can be attached so as to cover the fixing plate 51.
The position adjusting plate 56 has long holes 57a to 57d at positions matching the long holes 54a to 54d formed in the fixed plate 51.
7d is open. Here, the horizontal width of the long holes 54a to 54d is set wider than the horizontal width of the long holes 57a to 57d. This is because even if the position adjusting plate 56 is moved in the horizontal direction, the long holes 54a to 54d and the long holes 57a
This is because the protrusions 60a and 60b and the hooks 60c and 60d, which will be described later, can be inserted through the holes 57 to 57d.

Further, the position adjusting plate 56 is provided with long holes 58a to 58d in the horizontal direction so that the female screws 55a to 55d formed on the fixing plate 51 can be seen. By providing the long holes 58a to 58d in the horizontal direction in this way, the horizontal position when the position adjusting plate 56 is attached to the fixed plate 51 can be adjusted.

Further, a hole 59 is formed in the position adjusting plate 56 so that a screw for fixing the holder block 16 can pass through to the female screw 55e.

Printer housing 11 of holder block 16
The projections 60a and 60b and the hook 60
c and 60d are provided. These projections 60a, 60
b, the thickness of the hook portions 60c and 60d in the horizontal direction is set substantially equal to the width of the long holes 57a to 57d provided in the position adjusting plate 56.

Further, when the holder block 16 is mounted on the position adjusting plate 56, the holder block 16 is cut into the fixing plate 51 through a hole 59 formed in the position adjusting plate 56 on the side surface on the printer housing 11 side. Female screw 5
A male screw 61 to be screwed into 5e is attached.

As described above, the position adjusting plate 56 is
1, the long holes 58a to 58d are provided in the position adjusting plate 56 in the horizontal direction.
6 can be adjusted in the horizontal mounting position.
As described above, since the mounting position of the position adjusting plate 56 in the horizontal direction can be adjusted, the mounting position of the holder block 16 in the horizontal direction can be adjusted.

Therefore, the center position of the continuous paper 22 set on the supply core 18 attached to the holder block 16 can be matched with the center of the guide of the label printer. For this reason, printing deviation can be eliminated.

Next, referring to FIGS. 4A and 4B, a detailed configuration of the supply core 18 will be described. The supply core 18 has a two-part structure including an upper supply core 18a and a lower supply core 18b. Each of the upper supply core 18a and the lower supply core 18b has a semi-cylindrical shape. Four corners of the upper supply core 18a are screwed with the upper supply core 18a and the lower supply core 18b sandwiched about the rotation shaft 17 (shown in FIG. 1). At this time, the two sides of the upper supply core 18a and the lower supply core 18b along the rotation axis 17 are concave and convex shapes 75a, 7a, respectively.
5b, the upper supply core 18a
And the lower supply core 18b.

The upper supply core 18a is formed so as to be concave so that a flat portion 76 is formed at the center in the longitudinal direction. The flat portion 75 is provided with four slits 77 to 80 along the longitudinal direction. As shown in FIG. 4B, the back surface of the upper supply core 18a
The rack and pinion mechanism R described later with reference to FIG. 7 is attached, and the projections 81 to 81 having U grooves provided in the rack and pinion mechanism R through four slits 77 to 80.
84 are appearing.

A link mechanism is attached to the flat portion 76 as shown in FIG. The link mechanism will be described with reference to FIG. In FIG. 5, reference numeral 91 denotes a movable plate having a U-shaped cross section. The roller 22 shown in FIG. 1 is provided between the opposed side plates 91a and 91b of the movable plate 91.
Is attached.

A connecting plate 92 is connected to one end of the movable plate 91.
Is rotatably mounted about a shaft 93.

One end of the lever 23 is rotatably connected to the other end of the connecting plate 92 about a shaft (not shown) inserted through the hole 94. Note that the lever 23 is rotatable about a rotation shaft 95.

A long hole 96 is formed in the bottom plate 91c of the movable plate 91 to restrict the movement of the movable plate 91 in the longitudinal direction. Further, a long hole 97 is formed in the bottom plate 91c at a predetermined interval from the long hole 96.

A washer 98 a is fixed to the long hole 96 by a screw 98. Vertical movement of the movable plate 91 is restricted by the washer 98a.

As shown in FIG. 8, the bottom plate 91c beside the long hole 96 is bent in a U-shape to form a tapered portion 101. The bottom plate 91c beside the long hole 97 is also shown in FIG.
As shown in the figure, the tapered portion 102 is formed by bending in a V shape.

The flat portion 75 has the tapered portion 10
Projections 103 and 104 having a height δ (shown in FIG. 13) are formed at substantially the same interval as the interval between 1 and 102. On one side surface of the projections 103 and 104, tapered portions 103a and 104a having substantially the same angle as the tapered portions 101 and 102 are formed.

When the lever 23 is turned to the lock position shown in FIG. 8, the bottom plate 91c of the movable plate 91
This is because it is easy to get on the projections 103 and 104 from the position shown in FIG.

A U-shaped notch 106 is provided at the other end of the bottom plate 91c. This U-shaped notch 106
, A washer 107 is screwed by a screw 107a.

Incidentally, in FIG. 7, the lever 23 is in the unlock position, and in FIG. 8, the lever 23 is in the lock position.

In the locked position shown in FIG. 8, since the bottom plate 91c of the movable plate 91 rides on the projections 103 and 104, the height of the movable plate 91 increases by δ. Thus, when the height of the movable plate 91 increases by δ, the roller 2
The vertex of 2 moves so as to abut the inside of the paper tube 110, and is raised to a position where it bites into the paper tube 110 as shown in FIG. As shown in FIG.
Is set slightly smaller than the inner diameter of the paper tube 110. When the lever 23 is in the unlocked position as shown in FIG. 7, the lever 23 and the movable plate 91 are moved to a position retracted from the outer diameter of the supply core 18, and
Is stored.

As a result, when the lever 23 is at the unlock position, the continuous paper 21
Facilitates insertion and removal of

As shown in FIG. 8, a pair of elastic rings 120 are attached to both side surfaces of the lever 23. As shown in FIG. 8, when the lever 23 is at the lock position, the center of the elastic ring 120 is shifted from the rotation shaft 95 of the lever 23 by Δx in the insertion direction of the continuous paper 21.

By doing so, when the lever 23 is in the locked position, the supply holder 20 is set to a stable position slightly pushed back from the peak position pushed up from the inside.

Next, the rack and pinion mechanism R will be described with reference to FIG. The upper supply core 18a is provided with racks 130 and 131 that slide in parallel with each other and in directions different from each other by 180 degrees. The pinions 32 are engaged with the teeth carved on the opposing surfaces of the racks 130 and 131. The pinion 32 is rotatably screwed to the center position of the lower supply core 18b.

The rack 130 is formed integrally with a base 134 provided with the projections 81 and 83 having the above-described U-shaped grooves. The rack 131 is integrally formed with the base 133 provided with the projections 82 and 84 having the above-described U-shaped grooves.

By providing the rack and pinion mechanism in this manner, the bases 133 and 134 are slid in the direction of approaching each other around the pinion 32 or in the direction of separating from each other.

Next, the supply holder (back side) 19 will be described with reference to FIG. FIG. 9 is a perspective view of the supply holder (rear side) 19 as viewed from the holder block 16 side, and the base 134 and the base 134 are mounted on the base 134 so that the relationship with the rack and pinion mechanism shown in FIG. The projections 81 and 83 provided with the provided U grooves are also illustrated.

As shown in FIG. 9, a pair of rack connecting portions 141 and 142 are provided extending downward from above the inner peripheral surface of the boss portion 140 of the supply holder (rear side) 19. Protrusions 141aa and 142a are provided at one ends of the rack connecting portions 141 and 142, respectively, toward the outside. The protrusions 141a and 142a are provided on the base 134 described above.
Are engaged with the U-grooves formed on the projections 81 and 83 provided on the ridge.

Further, on the inner peripheral surface of the boss portion 140 of the supply holder (rear side) 19, the rack connecting portion 14
A pair of ribs 143 and 144 are formed almost directly below the first and second ribs 142.

Next, the configuration of the supply holder (insertion side) 20 will be described with reference to FIG. The boss portion 150 of the supply holder (insertion side) 20 is composed of a fixing portion 151 having an inverted U-shaped cross section and a cylindrical portion 152. Fixed part 15
1 is provided with a notch 153 so that the lever 23 can rotate when the lever 23 is in the locked position in the axial direction. The fixing portions 15 located on both sides of the notch 153
1, a pair of ribs 15 are provided in the vertical direction.
4,155 are provided. These ribs 154, 155
Are provided for pressing the projections 82 and 84 provided on the base 133 of the rack and pinion mechanism shown in FIG.
The axial length L of the notch 153 varies depending on the width of the continuous paper to be set.
The setting is such that the lever 23 can be pulled up to the locked position even if the position of 20 changes. further,
No matter where the lever 23 is locked due to the difference in the width of the continuous paper to be set, the elastic rings 1 provided on both sides of the lever 23 are provided inside the fixing portion 151.
20 has a fixing part shape such that the fixing part 151 can be pushed up from below. Further, a pair of rack connecting portions 156 and 157 are formed below the cylindrical portion 152. Projections 156a and 157a are formed on the rack connecting portions 156 and 157 outward.

Next, a case where the continuous paper 21 is set in the paper supply device 15 will be described. At the time of assembling the paper supply device 15, the supply holder (rear side) 19 is inserted into the supply core 18. Supply holder (back side)
The projections 141a and 142a provided on one end of the rack connection portions 141 and 142 provided on the inner peripheral surface of the 19 boss portion 140 are respectively provided on the base 134 integrally formed with the rack 131. , 83 (FIG. 9). Thus, the supply holder (rear side) 19 and the rack 131 can be linked. Then, the supply holder (rear side) 19 is pushed down to the holder block 16 side.

While the lever 23 is kept at the unlock position (release position) as shown in FIG. 12, the continuous paper 21 is inserted until it comes into contact with the supply holder (back side) 19. Next, the supply holder (insertion side) 20 is connected to the supply core 18.
Insert

When the supply holder (insertion side) 20 is inserted into the supply core 18, the supply holder (insertion side)
20. Ribs 154, 1 provided inside fixing portion 151
55 is a base 133 of the rack and pinion mechanism shown in FIG.
Starts pushing the projections 82 and 84 provided on the. Thus, when the projections 82 and 84 provided on the base 133 are pushed in the insertion direction, the base 134 slides so as to approach the base 133 by the rack and pinion mechanism R shown in FIG.
Protrusions 141a and 142a provided at one ends of rack connecting portions 141 and 142 provided on the inner peripheral surface of the boss portion 140 of the supply holder (rear side) 19 are respectively formed on a base 134 integrally formed with the rack 130. Are engaged with the U-shaped grooves of the projections 81 and 83 provided on the supply holder (rear side) 19 and the supply holder (insertion side) 20.
Approaching. Then, finally, a state of being sandwiched between the supply holder (rear side) 19 and the supply holder (insertion side) 20 is obtained.

As described above, the supply holder (back side) 19
Between the paper and the supply holder (insertion side) 20
Is in the state of being sandwiched, the continuous paper 21 is located at the center position. This is because the pinion 32 is rotatably screwed to the center position of the upper supply core 18a. The center position of the continuous paper is naturally aligned with the center of the guide of the label printer.

Next, as shown in FIG.
Pull up to the lock position. On both sides of the lever 23,
A pair of elastic rings 120 are attached. As shown in FIG. 8, when the lever 23 is at the lock position,
Since the center of the elastic ring 120 is shifted from the rotation shaft 95 of the lever 23 by Δx (shown in FIG. 8) in the insertion direction of the continuous paper 21, when the lever 23 is in the lock position, the supply holder (insertion side) 20 The supply holder (insertion side) 20 is set to the supply core 18 by setting the
Can be fixed.

Further, when the lever 23 is set to the lock position, as described above, the roller 22 bites into the paper tube 110 as shown in FIG. Thus, the supply core 18 and the paper tube 110 are fixed. Since the direction of the roller 22 is perpendicular to the direction of rotation of the paper tube 110, the position of the roller 22 does not shift even when the supply core 18 rotates. Further, specifically, even if the supply core 18 rotates forward or backward, the relative position between the supply core 18 and the paper core 110 does not collapse.

As described above, the supply holder (insertion side) 20 can be fixed to the supply core 18, and the paper tube 110 can be fixed to the supply core 18.

Therefore, when color printing is performed on the continuous paper 21 by the four thermal head printing mechanisms provided in the housing 11, even when the continuous paper 21 needs to be back-fed, Can be done.

When the continuous paper 21 is inserted into the supply core 18, since there is a space between the paper core 110 and the supply core 18, the continuous paper is wound neatly on the paper core 110. Supplying continuous paper 21 to supply core 1
8 can be inserted. For this reason, by eliminating the occurrence of the collapse of the continuous paper 21, the shift of the printing position,
Problems such as meandering and skew of paper can be prevented.

In particular, in a color printer in which different colors are printed by a plurality of heads, a printing deviation occurs when the paper meanders. By adopting such a structure, the paper meandering is reduced, and therefore the printing quality is reduced. Will be better.

Next, another embodiment will be described with reference to FIGS.

In this embodiment, the paper supply device is of a built-in type provided inside a printer housing of a label printer. FIG. 15 is a sectional view schematically showing a label printer with a built-in paper supply device.

Referring to FIG. 15, reference numeral 201 denotes a printer housing.
The continuous paper 21 wound around the paper tube 110 is disposed inside the printer housing 201 as described above, and is supported by the paper supply device of this embodiment as described later. The supported continuous paper 21 is fed out by the feed roller 202 and then the pinch roller 2.
The label 21 a conveyed by the label 03 is peeled off by the label peeling member 204 and is wound up by the take-up reel 205. When the continuous paper 21 passes through the thermal head 206 in front of the peeling member 204,
Printing is performed on the label 21a via the ink ribbon 207 that is separately conveyed.

Next, the paper supply device will be described with reference to FIGS. The paper supply device of this embodiment is of a type in which a supply core is fixed and does not rotate. FIG. 16 to FIG. 22 show a paper supply device.
16 is a cross-sectional view showing the entire paper supply apparatus, FIG. 17 is a front view showing the entire paper supply apparatus as viewed from above, FIG. 18 is a perspective view showing a state where a supply holder on the continuous paper insertion side is removed, and FIG. FIG. 20 is a perspective view showing a state where the supply core is detached from the supply holder, FIG. 20 is a perspective view showing the supply core divided into upper and lower parts, and FIG. 21 is a perspective view showing the upper part and the pinion-rack mechanism of the supply core viewed from below. FIG. 22 is a diagram showing the upper part of the supply core and the pinion-rack mechanism as viewed from below, and FIG. 23 is a perspective view showing the supply holder on the paper insertion side.

In the figure, reference numeral 211 denotes a supply core 221 which is a cylindrical body closed at both ends for supporting the continuous paper 21.
Reference numerals 213 and 213 denote a pair of supply holders for pressing both ends in the axial direction of the continuous paper 21 supported by the supply core 211. The supply core 211 is disposed horizontally inside the printer housing 201, and one end is provided at the printer housing 201.
The entire axial direction is divided into an upper part and a lower part by a horizontal diameter line passing through the central axis, and the lower supply core 221 and the upper supply core 222 are combined and configured. And the upper supply core 222
Is divided into a left part and a right part in the axial direction at the center part in the axial direction, and is configured by combining an upper supply core 222A on the fixed side and an upper supply core 222B on the insertion side.

The lower supply core 221 has a semicircular cross section, is cut off at the top, and is open. The fixed end is a disk end surface 223 which also serves as the end surface of the upper supply core 222A. In the lower supply core 221, through-holes 224 are formed on both sides in the width direction (diameter direction) of the lower supply core 221 on the fixed side with respect to the center in the axial direction. Through holes 225 penetrating along the vertical direction are formed on both sides in the width direction (diameter direction) of the portion on the paper insertion side. The through holes 224 and 225 are for inserting the connecting screws 215, and the through holes 224 on the fixed side are elongated holes extending along the supply core axis direction. This makes the upper supply core 222A displaceable along the axial direction, and its length corresponds to the displacement distance.

Further, a bolt supporting portion 226 for supporting the fixing bolt 214 is formed on the lower supply core 221.
A through hole 227 is formed in the disk end surface 223 on the supply core center axis. Lower supply core 22
Reference numeral 1 denotes an arrangement in which the disk end surface portion 223 is in contact with the surface of a vertical wall of the printer housing 201. The fixing bolt 214 is disposed on the lower supply core 221 and the bolt supporting portion 226
The lower supply core 221 is fixed to the printer housing 201 by being horizontalized on the central axis of the supply core, inserted through the through hole 227 and screwed into a screw hole 216 formed in the printer housing 201. . In FIG.
Reference numeral 4a denotes a nut screwed into a fixing bolt 214 inserted into a screw hole 216 formed in the printer housing 201.
A pin 228 protruding from the outer surface of the disk end surface 223
Are formed on the wall of the printer housing 201 and engaged with the pin holes 217 to prevent the lower supply core 221 from rotating. Note that an engagement step 229 is formed on the peripheral edge of the upper opening of the lower supply core 221.

The upper supply core 222A and the upper supply core 222B each have a semicircular cross section and are cut and opened at the lower part. The upper supply core 222A on the fixed side has an end face at the fixed end and a central side. Both end surfaces are open, and the upper part of the center end is protruded in the axial direction toward the upper supply core 222B to form a projection 230 for pinion attachment. A bearing 231 for attaching a pinion is formed below the protrusion 230 (inside the supply core) along the vertical direction. Upper supply core 222A is upper supply core 22
2, the upper supply core 222B is slightly shorter than half of the axial length of the whole. Upper supply core 22
The 2A projection 230 protrudes beyond half the axial length of the entire upper supply core 222, and the bearing 231 is located at a position half the axial length. Upper supply core 22
A guide slot 232 is formed at the top of 2A along the axial direction, and the length of the guide slot 232 corresponds to a rack movement distance described later. Also, the upper supply core 222
A screw hole 233 is formed on both sides in the width direction (diameter direction) of A along the vertical direction, and the screw hole 233 is a long hole-shaped through hole formed on the fixed side portion of the lower supply core 221. 224.

The upper supply core 222B on the paper insertion side has an end face at the insertion side end closed, and both end faces at the center side end are open, and the top at the center side end is an upper supply core 222B. The notch 234 formed at the end of the center portion on the side of the center and engaged with the projection 230 for attaching a pinion is formed so as to be recessed along the axial direction. At the top of the upper supply core 222B, a guide slot 2 extends along the axial direction.
35, and the length of the guide slot 235 corresponds to a rack moving distance described later. The upper supply core 222B has an opening 236 that communicates with the guide slot 234 at the end face on the insertion side end. Further, screw holes 237 are formed on both sides in the width direction (diameter direction) of the upper supply core 222B along the vertical direction, and the screw holes 237 are formed on the insertion side of the lower supply core 221 on the insertion side. It faces the hole 225. An engagement step 238 is formed at an edge of the lower open portion of the upper supply core 222A and the upper supply core 234B.

[0097] The upper supply core 222A and the upper supply core 222B abut each other at their center-side ends,
The projection 230 of the upper supply core 222A is engaged with the notch 234 of the upper supply core 234B and arranged in a line on the same axis. The upper supply core 222A is located at the upper opening of the fixed side of the lower supply core 221. The upper supply core 222 </ b> B is disposed above the upper opening of the sheet insertion side while being disposed on the upper side. Then, the connection screw 215 is inserted from the lower side of the lower supply core 221 into the elongated through-hole 224 formed on the fixed side thereof, and then screwed into the screw hole 233 of the upper supply core 222A to be tightened. Further, the connecting screw 215 is inserted from the lower side of the lower supply core 221 into the through hole 225 formed on the paper insertion side thereof, and then screwed into the screw hole 237 of the upper supply core 222A and tightened. As a result, the upper supply core 222A and the upper supply core 222B are integrally connected to the lower supply core 221 to form a supply core 211 that forms a cylindrical body. Note that the engagement step 238 of the upper supply core 234B and the upper supply core 222A and the engagement step 229 of the lower supply core 221 are engaged, and both supply cores are securely engaged.

Here, since the through hole 224 formed from the lower side of the lower supply core 221 to the fixed side thereof forms an elongated hole along the axial direction, the connecting screw 215 to be inserted is formed in the elongated through hole 224. The inside of the upper supply core 234A can be moved along the supply core axial direction by moving the connection screw 215 along the supply core axial direction. Thereby, the protrusion 230 and the bearing 231 move together with the upper supply core 234A. Note that the projection 230 of the upper supply core 222A is formed by the notch 234 of the upper supply core 234B.
The upper supply core 222 moves in the axial direction along the inside.
A is running away.

Further, the pair of supply holders 212 and 21
3 is the supply core 2
The other supply holder 212 is movably supported on the paper insertion side while the other supply holder 212 is movably supported by the fixed side portion of the paper supply 11. The fixed-side supply holder 212 has a cylindrical portion 241 and a pressing plate portion 242 formed around the cylindrical portion 241. The cylindrical portion 241 is fitted with the supply core 211 so as to be movable in the axial direction. The cylindrical portion 241 has an inner diameter corresponding to the outer diameter of the supply core 211, and has a claw portion that bites into the outer peripheral surface of the supply core 211 to prevent rotation. 243 are formed. At the top of the cylindrical portion 241 is a rack 2 described later.
A hole 244 for engaging the 62 connection claws 266 is formed. The pressing plate portion 242 comes into contact with and presses one end face of the continuous paper 21.

The supply holder 213 on the paper insertion side has a cylindrical portion 245 and a pressing plate portion 246 formed around the cylindrical portion 245. The cylindrical portion 245 has the inner diameter corresponding to the outer diameter of the supply core 211 and is fitted on the outer peripheral surface of the supply core 211 to prevent rotation. A claw portion 247 to be inserted is formed. Also,
A plurality of slits 248 are formed in the cylindrical portion 245 at a plurality of positions spaced apart in the circumferential direction and extend in the axial direction from the distal end opening toward the base end where the holding plate portion 246 is formed. Each of the divided portions of the cylindrical portion 245 can be elastically displaced radially inward and outward with the base end as a fulcrum. The screw portion 24 is provided on the outer peripheral surface of the cylindrical portion 245.
9 are formed. This cylindrical portion 245 has a stationary ring 25
0 is screwed. The fixed ring 250 has an inner diameter smaller than the outer diameter of the cylindrical portion 245, and has a threaded portion 25 on its inner peripheral surface.
1 is formed. That is, in a state where the cylindrical portion 245 is fitted to the supply core 211, the fixed ring 250 is fitted to the cylindrical portion 245, the screw portion 251 is screwed to the screw portion 249, rotated, and moved in the axial direction. The supply core 211, into which the cylindrical portion 245 is fitted, is displaced inward by being clamped by the fixed ring 250,
Is pressed from the outer peripheral side to the entire periphery to grip the supply core 211. Thus, the supply holder 212 is fixed to the supply core 211.

Further, a rack-pinion mechanism R is provided inside the supply core 211, and the rack-pinion mechanism R includes one pinion 261 and the pinion 2
61 and a pair of racks 262 and 263 meshed with the rack 61. One pinion 261 is rotatably supported by a shaft 264 and a washer 265 which are vertically mounted on the bearing 231 of the projection 230 of the upper supply core 222A on the fixed side. Each of the racks 262 and 263 is a linear rod-shaped member having a length substantially half of the entire length of the supply core 211, and has teeth formed on one side edge over substantially the entire length in the length direction. .

One of the racks 262 is disposed along the axial direction on one side in the core width direction with respect to the pinion 261 inside the upper supply core 222A on the lake bottom side, and the teeth are formed on the outer peripheral surface of the pinion 361. It is in mesh with the teeth. At the end of the rack 262 on the same side as the end on the supply core fixed side, there is formed a connecting claw 266 projecting outward through a guide slot 232 formed at the top of the upper supply core 222A. Guide slot 23
2 can be moved along the axial direction. The connecting claw 266 is inserted and engaged with the hole 244 of the cylindrical portion 241 of the fixed-side supply holder 212 fitted to the supply core 211, and is attached by a screw 267. As a result, the supply holder 212 and the rack 262 are connected, guided by the elongated guide hole 232, and moved along the axial direction. The large diameter portion 261a is provided below the pinion 261.
Is formed on the upper supply core 234B.
68 are formed, and the rack 262 is movably supported from below.

The other rack 263 is disposed along the axial direction on the other side in the core width direction with respect to the pinion 261 inside the upper supply core 222B on the paper insertion side, and has teeth formed on the outer peripheral surface of the pinion 361. Meshed with the teeth. At the end of the rack 262 on the same side as the end on the supply core fixed side, there is formed an engagement recess 270 that is open at the end face and extends in the axial direction. An engagement claw 271 is formed vertically on the top of the inside of the cylindrical portion 245 of the supply holder 213 on the paper insertion side. This engagement claw 271 is
When the supply holder 213 is inserted into the supply core 211, the engagement claws 272 are inserted into the supply core 211 through the opening 236 at the end surface of the supply core 211, and are inserted into the engagement recesses 270 at the end of the rack 262. Insert and engage. In this case, the engagement recess 270 is provided in the supply holder 213.
The engagement between the supply holder 213 and the rack 263 is ensured by the engagement with the engagement claws 271 by elastic force. As a result, the supply holder 213 and the rack 263 are connected, guided by the guide elongated holes 235, and moved along the axial direction. In addition,
A large diameter portion 261a is formed below the pinion 261.
A support projection 269 is formed on the upper supply core 234A, and the rack 263 is movably supported from below.

Then, the supply holder 21 on the paper insertion side is
When 3 is moved along the axial direction of the supply core 211,
Since the rack 263 moves integrally with the pinion 261 in the axial direction, the pinion 261 rotates in a direction corresponding to the direction in which the rack 263 moves. Since the pinion 361 rotates by meshing with the rack 262, the rack 262 moves in accordance with the rotation direction of the pinion 361, and the supply core 212 on the lake bottom side is integrated with the rack 262.
Moves along the axial direction of the supply core 11. For example, when the supply holder 213 moves toward the center of the supply core 211, the rack 263 moves in the same direction, the pinion 361 rotates, the rack 262 moves, and the supply holder 212 moves toward the center of the supply core 211. Move. That is, a pair of supply cores 21
2, 213 move equidistantly so as to approach each other. When the supply holder 213 moves toward the insertion-side end of the supply core 211, the rack 263 moves in the same direction, the pinion 361 rotates, and the rack 262 moves, and the supply holder 212 moves to the fixed side of the supply core 211. Move towards the end. That is, the pair of supply cores 212 and 213 move equidistantly so as to be separated from each other. When the pair of supply cores 212 and 213 approach and separate from each other, the supply cores 212 and 213 always move equidistantly about the pinion 361 at the longitudinal center of the supply core 211. For this reason, by inserting the continuous paper 21 into the supply core 211 and pressing both end surfaces with the pair of supply cores 212 and 213, the axial center of the continuous paper 21 is made coincident with the longitudinal center of the supply core 211. Can be held down.

When assembling this paper supply apparatus, after fixing the lower supply core 221 to the printer housing 201, the upper supply core 222A.P with the pinion 261 and the racks 262,263 is provided. The supply core 211 is assembled by combining 222B with the lower supply core 221. Thereafter, the fixed-side supply holder 212 is fitted to the supply core 211 and connected to the rack 262.

When the continuous paper 21 is held by the paper supply device, the continuous paper 21 is inserted from the insertion end of the supply core 211 and supported, and then the supply holder 213 on the insertion side is inserted into the insertion core of the supply core 211. It is fitted to the end and connected to the rack 263. Then, the pair of supply cores 212 and 213 are moved by the above-described operation to press both end faces of the continuous paper 21. Note that the continuous paper 21 is supported by the supply core 211 and is rotated and fed out.

Thus, the continuous paper 21 is supplied to the supply core 2
11, racks 262, 26 serving as a sheet positioning mechanism provided inside the supply core 211 when supporting it by inserting it into the supply core 211.
By using the pinion 3 and the pinion 261, the center of the continuous paper 21 can be accurately aligned (centered) with the axial center of the supply core 211 and supported by a simple operation.

The upper part of the supply core 211 is divided into an upper supply core 222A and an upper supply core 222B at the center in the axial direction, and one of the upper supply cores 222A to which the pinions 261 are attached is pivoted with respect to the lower supply core 221. The position of the pinion 261 can be displaced along the axial direction of the supply core 211 in order to combine the pinions 261 so that they can move in the directions. Pinion 261
Is displaced in the axial direction of the supply core 211, the position of the continuous paper 21 inserted into the supply core 211 and pressed by the pair of supply holders 212 and 213, that is, the position of the axial center of the continuous paper 21 can be displaced. . Therefore, when the center of the continuous paper set in the paper supply device is shifted with respect to the axial center of the thermal head provided in the printer, one upper supply core is axially displaced in accordance with the amount of the shift. By stopping with a screw, the center of the continuous paper to be supported can be aligned with the center of the thermal head of the printer.

Another different embodiment will be described with reference to FIGS. FIG. 24 is a front view showing the entire sheet supply device in this embodiment as viewed from above,
FIG. 25 is a perspective view showing the entire sheet feeding apparatus according to the embodiment, and FIG. 26 is a perspective view showing a state where the supply holder in the sheet feeding apparatus according to the embodiment is removed. 24 to 26, the same parts as those in FIGS. 17 to 23 are denoted by the same reference numerals.

In the paper feeding apparatus of this embodiment, support shafts 281 located on the center axis are provided at both ends of the supply core 211, and bearings 282 are provided at the ends of the support shafts 281. . A pair of shaft supports 283 are formed at predetermined positions in the paper feeder arrangement position inside the printer housing 201, and the pair of shaft supports 283 are formed.
Is formed with a shaft support 284 that is open at the upper edge.

The continuous paper 21 is provided between the pair of shaft supports 283 as the supply core 211,
11 is provided with a pair of shaft supports 283.
Is inserted from above. As a result, the supply core 211 is rotatably supported by the bearing 282, and the continuous paper 21 rotates integrally with the supply core 211 and is fed out.

The supply core 211, the supply holder 222, and the rack-pinion mechanism in the paper supply device of this embodiment have the same configuration, operation and effect as those of the above-described embodiment.

The present invention is not limited to the above-described embodiment, but can be implemented with various modifications. For example,
In the first embodiment described above, the case where the paper supply device is used for paper supply of a color printer has been described.
Not limited to a color printer, a monochrome printer may be used as long as continuous paper is used, and the second embodiment may be applied to a color printer.

[0114]

As described above in detail, according to the paper feeding apparatus of the first aspect, when setting continuous paper, the continuous paper can be easily set to the center position simply by pushing the supply holder (insertion side). In addition, since the paper tube can be fixed and the paper tube can be fixed without causing the paper to collapse, it is possible to prevent the printing position from shifting, and the paper from meandering and skewing.

According to the paper supply apparatus of the second aspect of the present invention,
When the continuous paper is set, when the lever is operated to the fixing position, the roller moves so as to contact the inside of the paper tube, so that the paper tube can be securely fixed to the supply core. In other words, since the direction of the rollers is perpendicular to the direction of rotation of the paper tube, even if the supply core rotates,
The position of the rollers does not shift. Furthermore, specifically, even if the supply core rotates forward or backward, the relative position between the supply core and the paper core does not change. Therefore, according to the third aspect of the present invention, the continuous paper can be easily adjusted to the center position and the paper tube can be fixed without causing the paper to collapse.
When the lever is in the fixed position, the center of the continuous paper set between the supply holders does not shift because the elastic member attached to the side of the lever fixes the lever from the inside of the supply holder.

According to the invention of claim 4, in the invention of claim 3, when the lever is operated to the fixed position, the mounting position of the elastic member is closer to the insertion direction of the continuous paper than the fulcrum of the lever. , The lever can be stabilized at the fixed position. For this reason, the displacement of the supply holder can be eliminated.

According to the fifth aspect of the present invention, in the third aspect of the present invention, the shape of the fixing portion of the supply holder can be changed even if the position of the supply holder on the paper insertion side moves due to the difference in width of the continuous paper. Since the member can be fixed from the inside of the supply holder, the position of the supply holder can be reliably fixed even if the width of the continuous paper is different.

According to the invention described in claim 6, in the invention described in claim 2, it is possible to easily remove and insert the continuous paper into the supply core.

According to the paper supply device of the present invention, since the paper supply device externally attached to the printer housing is attached to the printer housing via the position adjusting plate, the guide of the label printer is provided. The center can be aligned with the center of the guide of the paper supply device.

[0120] The paper supply device for a label printer according to the eighth aspect of the present invention is the same as the first aspect, wherein the continuous paper is accurately centered by a simple operation by a paper alignment mechanism comprising a rack-pinion mechanism provided inside the supply core. Matching can be performed.

According to the ninth aspect of the present invention, in the first aspect of the present invention, the upper and lower supply cores, which are divided into two, engage with each other in an uneven manner.
The supply core can be surely integrated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a paper supply device according to an embodiment of the present invention is attached to the back of a housing of a label printer.

FIG. 2 is a view showing a mechanism of a thermal printer provided in a label printer housing according to the embodiment.

FIG. 3 is an exploded perspective view illustrating an attached state of a holder block on a back surface of the label printer housing according to the embodiment.

FIG. 4 is a perspective view showing a structure of a supply core in the embodiment.

FIG. 5 is an exemplary perspective view showing a link mechanism according to the embodiment;

FIG. 6 is an exemplary perspective view showing a rack and pinion mechanism according to the embodiment;

FIG. 7 is a plan view of the upper supply core in the embodiment.

FIG. 8 is a sectional view of an upper supply core in the embodiment.

FIG. 9 is a supply holder (rear side) in the embodiment.
FIG.

FIG. 10 is a perspective view of a supply holder (insertion side) in the embodiment.

FIG. 11 is a diagram showing a state in which the lever in the embodiment is at a lock position.

FIG. 12 is a diagram showing a state in which the lever according to the embodiment is at an unlock position.

FIG. 13 is a view for explaining a state in which the lever in the embodiment is in an unlock position.

FIG. 14 is a diagram showing a relationship between a roller and a paper tube when the lever in the embodiment is at a lock position.

FIG. 15 is a diagram illustrating a printer equipped with a paper supply device according to another embodiment of the present invention.

FIG. 16 is a cross-sectional view showing the entire sheet supply device in the embodiment.

FIG. 17 is a diagram illustrating the entire sheet feeding apparatus according to the embodiment as viewed from above.

FIG. 18 is a perspective view showing a state in which the supply holder is removed in the paper supply apparatus of the embodiment.

FIG. 19 is an exemplary perspective view showing a state in which the supply core is removed from the supply holder in the paper supply apparatus according to the embodiment;

FIG. 20 is an exemplary perspective view showing a supply core in the paper supply device of the embodiment, which is vertically divided;

FIG. 21 is an exemplary perspective view showing an upper portion of a supply core and a pinion-rack mechanism in the paper supply apparatus according to the embodiment;

FIG. 22 is a diagram illustrating the upper part of the supply core and the pinion-rack mechanism as viewed from below in the paper supply apparatus of the embodiment.

FIG. 23 is a perspective view showing a supply core in the paper supply device of the embodiment.

FIG. 24 is a diagram illustrating an entire sheet supply apparatus according to another embodiment viewed from above.

FIG. 25 is a perspective view showing the entire sheet supply device in the embodiment.

FIG. 26 is a perspective view showing a state in which the supply holder is removed in the paper supply device of the embodiment.

[Explanation of symbols]

 11 printer housing, 15 paper feeder, 16 holder block, 18 supply core, 19 supply holder (back side), 20 supply holder (insertion side), 21 continuous paper, 22 roller, 23 ... Lever, 211 ... Supply core, 212 ... Supply holder, 213 ... Supply holder, R ... Rack-pinion mechanism.

Claims (9)

[Claims] 1. A label printer for printing on continuous paper such as a label or a tag, wherein a continuous core wound in a roll shape is inserted from one end side to hold the continuous paper; A pair of supply holders provided movably along the axial direction and provided on both sides of the continuous paper for determining the position of the continuous paper; and a supply holder on the paper insertion side of the pair of supply holders A sheet feeding device for a label printer, comprising a sheet positioning mechanism capable of setting a sheet by centering when the sheet is pushed in by a printer. 2. A label printer for printing on continuous paper such as a label or a tag, comprising: a supply core for holding a continuous paper wound in a roll shape around a paper core; A pair of supply holders provided on both sides of the continuous paper for determining the position of the continuous paper, a lever operated when fixing the paper tube to the supply core, and a roller when the lever is operated to the fixed position, the roller is operated. A sheet feeding device for a label printer, comprising: a link mechanism for moving the roller so as to contact the inside of the paper tube and operating the lever to a release position so that the roller moves inward from the inner diameter of the paper tube. . 3. The paper for a label printer according to claim 2, wherein when the lever is operated to a fixed position, the supply member is fixed from the inside of the supply holder by an elastic member attached to a side surface of the lever. Feeding device. 4. The apparatus according to claim 3, wherein when the lever is operated to the fixed position, the mounting position of the elastic member is closer to the continuous paper insertion direction than the fulcrum of the lever. Paper feeder for label printer. 5. A supply holder on the paper insertion side of the pair of supply holders, even if the position of the supply holder on the paper insertion side moves due to a difference in width of the continuous paper, the elastic member allows the supply holder to move from the inside of the supply holder. 4. The sheet supply device for a label printer according to claim 3, wherein a fixing portion shape is provided so as to be fixed. 6. When the lever is moved to the release position, the lever is located at a position lower than the height of the supply core and smaller than the inner diameter of the paper tube, so that the lever can be moved to the supply core. 3. The paper supply device for a label printer according to claim 2, wherein the continuous paper can be easily inserted and removed. 7. An apparatus externally attached to a printer housing of a label printer, wherein the label printer is attached to the printer housing via a position adjusting plate such that the center of the guide of the label printer coincides with the center of the device itself. A sheet supply device for a label printer. 8. The paper positioning mechanism includes a pinion disposed at the center of the inside of the supply holder and supported by the supply core, and a pinion disposed inside the supply core so as to be movable in an axial direction thereof and sandwiching the pinion. 2. The paper supply device for a label printer according to claim 1, wherein the rack-pinion mechanism has a pair of racks meshed with the pinion and connected to the pair of supply holders. 9. The paper supply device for a label printer according to claim 1, wherein said supply core has a vertically divided structure, and a meshing portion thereof is meshed in an uneven shape.