JPH1016337A - Label printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add tension in a degree wherein mounting paper is not loosened to the mounting paper in back feed while tension capable of peeling off a label is added to the mounting paper in winding by a method wherein a one way clutch is provided, and first and second friction faces of which frictional forces are different to each other, are provided. SOLUTION: Rotary force of a winding axis 31 is transmitted to a winding roller 30 via a one way clutch 32 in winding. When tension of mounting paper becomes larger than maximum static frictional force of a first frictional face 3A, since slipping is generated on the first frictional face 3A, comparatively large tension is applied to the mounting paper, and a label can be peeled off from the mounting paper. Besides, since frictional force of the second frictional face 3B is set to be less than that of the first frictional face 3A in back feed, a clutch board 33 is rotated to a second frictional plate 36 on the second frictional face 3B, and comparatively small rotary resistance is generated on the winding roller 30. Therefore, comparatively small tension is given to the mounting paper, and the mounting paper may not hang down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label printer and, more particularly, to a winding device for winding a used backing paper.

[0002]

2. Description of the Related Art In this type of label printer, a label on a mount (label sheet) is printed, and then the printed label is separated from the mount. The peeled label is
It is affixed to a packaging material such as a pack product, and the mount is wound up by a winding roller. FIGS. 8 and 9 show an example of a backing mechanism for a mount of a label printer of this type.
No. 3260).

In FIG. 8A, a print roller 101 is in pressure contact with a print head 100 via a print paper L. A peeling shaft 102 is provided in front of the printing roller 101, and the peeling shaft 102 folds the printing paper L wound along the printing roller 101 at an acute angle so that the label printed from the printing paper L is printed. Peel off L1. The mount L3 from which the label L1 has been peeled off is taken up by the take-up roller 112.

In FIG. 9, a take-up roller 112 is rotatably mounted on a take-up shaft 111 driven by a motor (not shown). On the other hand, a friction plate 113
Is fixed, and the friction plate 113 is
Is pressed against the end surface 112a of the coil spring 114 by the spring force of the coil spring 114. This pressing force causes the take-up roller 112
, The winding speed of the winding roller 112 is set to be higher than the sending speed of the printing roller 101,
The take-up roller 112 is rotated forward in the take-up direction while slipping with respect to the take-up shaft 111, and the mount L3 sent out from the print roller 101 in FIG.
Take up to 2. Thereby, at the time of winding, by applying tension to the mount L3, the label L1
It is possible to peel off.

In this type of label printer,
When the printed label L1 is sent to a position where the label L1 is peeled, the leading end of the subsequent label L2 passes through the printing position P. If this state is left, a blank portion that cannot be printed occurs at the leading end of the label L2. Therefore, conventionally, as shown in FIG. 8B, by rotating the print roller 101 and the take-up roller 112 in opposite directions, the subsequent label L2
Is slightly retracted (back feed), and then the label L
2 is started.

However, as described above, the winding speed of the winding roller 112 during the winding shown in FIG.
Since the transmission speed is set to be higher than the transmission speed in FIG.
At the time of the back feed in (b), the unwinding speed of the winding roller 112 is higher than the unwinding speed of the printing roller 101. Therefore, the mount L3 hangs down as the mount L3 hangs down. As described above, when the mount L3 becomes loose, even if the print roller 101 and the take-up roller 112 shown in FIG. 8A are subsequently rotated forward, the generation of tension in the mount L3 at the peeling shaft 102 is delayed. Therefore, the label L2 is not peeled off, and
A situation occurs in which the side is wound up.

In this type of label printer, a conveyor for transporting articles is provided below the label pasting machine. Therefore, when the mount L3 hangs down as shown in FIG. 8B, there arises a problem that the mount L3 comes into contact with the upper surface of the article.

Therefore, a winding device which solves such a problem has been proposed (Japanese Utility Model Laid-Open No. 5-60852). This is shown in FIG. In FIG. 10, a take-up roller 111 is fixed to a take-up shaft
Reference numeral 1 is driven by a DC motor different from the stepping motor for driving the print roller 101 (FIG. 8). The DC motor rotates the winding shaft 111 at a speed corresponding to the winding diameter of the mount L3 in FIG. 8A to apply an appropriate tension to the mount L3 during winding.

On the other hand, a one-way clutch 115 for transmitting the rotational force of the winding shaft 111 only when the winding shaft 111 rotates in reverse (back feed) is mounted on the winding shaft 111. The clutch plate 116 mounted on the one-way clutch 115 is moved by the spring force of the coil spring 114.
It is in pressure contact with the friction plate 117. In this conventional technique, the DC motor is stopped during reverse rotation (at the time of back feed), and the take-up roller 112 and the take-up shaft 11 are mounted together with the mount L3 (FIG. 8).
1 reversely rotates the clutch plate 116 via the one-way clutch 115, and the frictional force between the clutch plate 116 and the friction plate 117 causes the backing sheet L in FIG.
3 is applied to such an extent that it does not loosen.

However, in the latter conventional example, it is necessary to rotate the winding roller 112 by using a DC motor different from the stepping motor of the printing roller 101 (FIG. 8). Becomes Further, at the time of back feed, the DC motor is stopped while the stepping motor is rotated in the reverse direction, so that the control becomes complicated. Further, at the time of back feed, the output shaft (not shown) of the DC motor is generated as the take-up shaft 111 rotates in the reverse direction.
Rotates in reverse, the uneven braking of the DC motor acts on the output shaft, so that an uneven braking force may also act on the mount L3 in FIG. 8B. For this reason, there is a problem that the positioning accuracy of the retracted label L2 is reduced.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a label printer with a tension capable of peeling off a label at the time of winding on a backing paper.
An object of the present invention is to provide a label printer capable of applying a tension to the mount so that the mount does not loosen during back feed and rotating the printing roller and the winding roller with one motor.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a winding roller rotatably mounted on a winding shaft driven by a motor. A label printer for rotating the winding paper forwardly in the winding direction to wind the mount sent out from the printing roller around the winding roller, wherein the winding roller rotates forwardly with the rotation of the winding shaft. A one-way clutch that transmits the rotational force of the take-up shaft to a first friction surface that transmits the take-up force from the one-way clutch to the take-up roller during take-up and allows the take-up roller to slip; A second friction surface that has a frictional force set to be smaller than the first frictional surface and provides a rotational resistance to the winding roller by the frictional force when the backing paper is back-fed.

According to the present invention, at the time of winding the mount, the printing roller and the winding shaft rotate forward in the winding direction, and the winding roller rotates via the one-way clutch as the winding shaft rotates forward. With the forward rotation, the mount is wound up by the winding roller.
During this winding, the winding force from the one-way clutch is transmitted to the winding roller, and the winding roller slips on the first friction surface with a relatively large first friction force.
Therefore, since a relatively large tension is applied to the backing sheet at the time of winding, the label is peeled off from the backing sheet by a peeling shaft for peeling off the label.

On the other hand, at the time of back feed, the printing roller is rotated in the reverse direction, the printing paper is slightly retracted, and the mounting sheet is unwound from the winding roller, whereby the winding roller is pulled by the mounting sheet and rotates in the reverse direction. During this back feed, a relatively small rotational resistance is generated on the winding roller by the second frictional force smaller than the first frictional force. Therefore, it is possible to prevent the unwinding amount of the backing paper from being larger than the rewinding amount of the printing paper by the printing roller, and to apply a small tension to the backing paper. Therefore, there is no fear that the unwound mount hangs down. Further, since only a smaller tension is generated on the backing sheet than at the time of winding, the tension does not hinder the rewinding operation by the printing roller. As a result, the amount of rewinding by the printing roller becomes the expected length, and the accuracy of the stop position (rewinding position) of the printing paper is also improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, a label printing / pasting apparatus including a label printer A, a label pasting machine B, a conveyor C, and the like as shown in FIG. 1 will be described.
The label printer A prints a label and peels off the label from the backing paper to issue the label. The label sticking machine B sticks the issued label on the surface of the article on the conveyor C.

FIG. 2 schematically shows the winding device 1 for the printing paper L of the label printer A. The winding device 1 has a drive gear 12 rotated by a stepping motor M indicated by a broken line, a number of idle gears 13, a first driven gear 14 and a second driven gear 15, and the rotation of the motor M The winding shaft 31 (FIG. 5) of the printing roller 20 and the winding roller 30 is intermittently rotated forward and backward. By rotating the motor M in the forward direction, the winding device 1 transfers the printing paper L from the label roll Lr attached to the unwinding roller 10 to the printing roller 2 at the lower left of the drawing.
The winding roller 30 is folded back around zero.
To take up. On the other hand, when the motor M rotates in the reverse direction, the winding device 1 slightly rewinds the mount L3 of the winding roller 30 in the arrow R direction.

FIGS. 3 and 4 show the structure of the printing unit 2. FIG. The printing unit 2 changes from the mounted state in FIG.
And a detachable printing unit 21 as shown in FIG.
The print unit 21 includes a print head 22 and the print head 22.
And a unit body 24 for fixing the unit with screws 23.
As shown in FIG. 4A, the printing unit 21 slightly rotates the printing unit 21 around the pin 26 in the direction of the arrow against the spring force of the coil spring 25.
As shown in (b), by pulling out to the left side, it can be removed from the bracket 11. After the removal, the screws 23 are loosened to replace the print head 22, thereby facilitating the positioning when the print head 22 is replaced.

In FIG. 3A, a pressing roller 27 is provided below the printing roller 20. The pressing roller 2
Reference numeral 7 indicates that the print roller 20 is constantly pressed upward by the coil spring 28 to press the print roller 20 toward the print position P of the print head 22. A crescent-shaped peeling shaft 29 is provided near the printing roller 20. The peeling shaft 2
9 is for peeling off the label L1 from the printing paper L by folding back the printing paper L wound along the printing roller 20 at an acute angle. The peeled label L1
Is attached by a label attaching machine B to the upper surface of an article conveyed on the conveyor C in FIG.

Next, the main part of the present invention will be described.
FIG. 5 is a sectional view showing the winding roller 30 and the like. In FIG. 5, the winding roller 30 is rotatably mounted on a winding shaft 31 driven by the motor M.
(FIG. 2). The winding roller 30
Is mounted with a mount pressing rod 30b for pressing the end of the mount L3 (FIG. 2) between the winding roller 30 and the winding roller 30. The product of the outer diameter of the winding roller 30 and the number of rotations of the winding shaft 31 is set to be greater than the peripheral speed of the printing roller 20 (FIG. 2). Winding shaft 3
By rotating forward in the winding direction while slipping with respect to 1, the winding roller 30 winds up the mount L3 in a state where tension is applied to the mount L3 sent out from the print roller 20.

The winding shaft 31 has a one-way clutch 3
2 is installed. The one-way clutch 32 transmits the rotational force of the winding shaft 31 to the winding roller 30 via the clutch plate (clutch member) 33 and the first friction plate 34 when the winding shaft 31 rotates forward. When the winding shaft 31 rotates in the reverse direction, no torque is transmitted. The clutch plate 33 has a set screw 33a on the outer periphery of the one-way clutch 32.
The one-way clutch 3
2, and is mounted on the winding shaft 31. The first friction plate 34 is interposed between the clutch plate 33 and the winding roller 30.

The winding roller 30 has a cylindrical shape, and a compression coil spring (spring member) 35 is housed in a hollow portion thereof. The spring 35 is connected to the end surface 30 of the winding roller 30.
is pressed toward the first end surface 33b of the clutch plate 33, and both end surfaces of the first friction plate 34 are pressed against the first end surface 33b of the clutch plate 33 and the end surface 30a of the winding roller 30 by this spring force. ing. The surface between the first friction plate 34 and the winding roller 30 constitutes a first friction surface 3A. The first friction surface 3A is formed by a first frictional force generated by the spring force.
When the mount L3 is taken up by the frictional force of
3 is transmitted to the winding roller 30 via the first friction plate 34, and when the tension of the backing sheet L3 becomes larger than a predetermined value, the winding roller 30 on the first friction surface 3A.
Is slipped with respect to the first friction plate 34 to allow the winding roller 30 to slip with the clutch plate 33.

On the other hand, the second end surface 33 of the clutch plate 33
The second friction plate 36 is pressed against c. The second friction plate 36 is provided between the clutch plate 33 and the cylindrical member 37. The take-up shaft 31 passes through the cylindrical member 37, and the cylindrical member 37 is
Is engaged with the tip of the male screw 37a.

The surface between the second friction plate 36 and the clutch plate 33 constitutes a second friction surface 3B. The second friction surface 3B has a frictional force (second frictional force) that is equal to the first frictional surface 3A.
The clutch plate 33, the first friction plate 34 and the winding roller 30 are allowed to rotate in the reverse direction during the back feed of the mount L3, and the winding roller is rotated by the second frictional force. By applying a rotational resistance to 30, a tension is applied to the back-fed mount L3.

In order to set the two kinds of frictional forces, in the present embodiment, for example, the first friction plate 34 is made of cork, the second friction plate 36 is made of metal, and the cylindrical member 37, the clutch plate 33 and The winding roller 30 is made of a synthetic resin. The first friction surface 3A is set to have a larger area than the second friction surface 3B. Note that a sheet made of a synthetic resin having a different material from that of the winding roller 30 may be fixed to the end surface 30a of the winding roller 30.

The take-up shaft 31 is rotatably supported by a feeder body frame 38 at a bearing 39. A thrust bearing 40 receiving the spring force of the spring 35 is provided at an end of the winding shaft 31.

Next, the operation of the winding device will be described. First, at the time of winding the mount L3 of FIG. 2, the motor M is rotated forward by a predetermined number of rotations, and the printing roller 20 and the winding shaft 31 (FIG. 5) are rotated forward in the winding direction F. By the forward rotation of the printing roller 20, the printing paper L in FIG. 3 advances in the winding direction F, and printing is performed on the label L1.

On the other hand, as the winding shaft 31 in FIG. 5 rotates forward, the clutch plate 33, the first friction plate 34 and the winding roller 30 rotate forward through the one-way clutch 32, and (FIG. 2) is taken up by the take-up roller 30. At the time of this winding, the rotational force of the winding shaft 31 is transmitted to the winding roller 30 via the one-way clutch 32, but it is larger than the maximum static friction force of the first friction surface 3A.
When the tension of 3 increases, slip occurs on the first friction surface 3A. Therefore, the mount L3 can be prevented from breaking, and a relatively large tension is applied to the mount L3.
Therefore, the label L1 can be peeled from the mount L3 by the peeling shaft 29 in FIG. In addition, the peeled label L1 is stuck on goods by the label sticking machine B (FIG. 1).

Next, the case of back feed will be described. At the time of back feed, the motor M of FIG.
(FIG. 5) is reversely rotated. When the printing roller 20 rotates in the reverse direction, the label L2 in FIG. 3B is slightly retracted rearward R, and is positioned with respect to the printing position P. 5 is unwound from the take-up roller 30.

At the time of this back feed, the winding roller 3
0 rotates in the reverse direction, the winding shaft 31 also rotates in the reverse direction, and the angular velocity of the winding shaft 31 is larger than that of the winding roller 30.
, The winding roller 30 is allowed to rotate in reverse with the first friction plate 34 and the clutch plate 33. Therefore, the print roller 20 and the take-up roller 30 can be driven to rotate by one motor M shown in FIG. 2, so that the cost can be reduced.

On the other hand, the frictional force of the second friction surface 3B in FIG.
Since the first friction surface 3A is set smaller than the first friction surface 3A, the clutch plate 33 on the second friction surface 3B
6 and a relatively small rotational resistance is produced on the winding roller 30. Therefore, the printing roller 2 shown in FIG.
The unwind amount of the mount L3 can be prevented from becoming larger than the unwind amount of the print paper L by 0, and a relatively small tension is applied to the mount L3. Therefore, the winding roller 30
There is no possibility that the mount L3 unwound from the hangs down.

Further, since only a smaller tension is generated on the backing sheet L3 than at the time of winding and the tension is always constant, there is no possibility that the tension may cause a variation in the rewind amount of the printing roller 20. That is, since the amount of rewinding by the print roller 20 becomes the expected length, the accuracy of the stop position when the label L2 in FIG. 3B is retracted is improved. Moreover, after rewinding, a slight tension remains on the backing sheet L3, so that when printing on the label L2, a large tension is immediately generated on the label L2. Can be increased.

In the above embodiment, the first friction plate 34 separate from the clutch plate 33 and the winding roller 30 shown in FIG.
Although the second friction plate 36 is provided, the first friction surface 3A and the second friction surface 3B may be provided in the present invention. That is, the first frictional surface is formed by providing a resin or metal film on the end surface 30a of the winding roller 30, the first end surface 33b, and the second end surface 33c of the clutch plate 33, or by applying predetermined processing to these surfaces. The surface 3A and the second friction surface 3B may be configured.

Further, the first friction surface 3A only needs to be set to have a larger friction force than the second friction surface 3B, and the present invention does not limit the friction coefficient or the size of the contact area.

Next, a description will be given of a device for adjusting the fixed position in the present label printing / pasting apparatus. In FIG. 1, the fixing position adjusting device D adjusts the fixing position of the conveyor C in the width direction W of the label pasting machine B disposed above the conveyor C. The fixed position adjusting device D includes an adjustment fixed frame 5 disposed above the label pasting machine B. The fixed frame 5 is fixed with a rail 50 shown in FIG. 6 extending along the longitudinal direction W of the fixed frame 5 (the width direction of the conveyor). The moving frame 6 is accommodated in the fixed frame 5. A large number of rollers (wheels) 63 that sandwich the rail 50 from above and below are rotatably attached to the moving frame 6. A positioning groove 50a for positioning the roller 63 in the lateral direction is formed in one of the rails 50.

Below the movable frame 6, a label pasting machine B is attached via a connecting portion 60 and a label printer A shown in FIG. The moving frame 6 is shown in FIG.
The top plate 61 and a pair of side plates (side portions) 62 as shown in FIG.
have. The top plate 61 is covered by the top plate 51 of the fixed frame 5, while each side plate 62 faces a pair of side plates 52 of the fixed frame 5. In addition, the pair of rails 50, 50 protrude toward the inside of the fixed frame 5.

As shown in FIG. 7, the top plate 61 of the moving frame 6 has a plurality of engaging through holes 64 penetrating vertically.
Is provided. A plurality of engagement pipes (engagement rods) 70 that engage with the engagement through holes 64 pass through the engagement through holes 64. A first plate 71 and a second plate (pressed upper portion) 72 are fixed above and below the engagement pipe 70. A plurality of pressed members 73 are fixed on the upper surface of the first plate 71. The pressed member 73 is made of, for example, rubber, and exerts a fixing force (friction force) for fixing the moving frame 6 to the fixed frame 5 by being pressed against the lower surface of the top plate 51 of the fixed frame 5.

The fixed frame 5 has an operation shaft 7
4 is rotatably supported. The axis of the operation shaft 74 is set along the longitudinal direction W of the fixed frame 5. A large number of cam portions 75 are fixed to the operation shaft 74. The cam 75 is shown in FIG.
As shown in (a) and (b), when the operation shaft 74 rotates, the second plate 72 is moved up and down. As shown in FIG. 6A, the cam portion 75 pushes the second plate 72 upward, thereby connecting the pressed member 73 via the engagement pipe 70 and the first plate 71 to the top plate of the fixed frame 5. By pressing the moving frame 6 against the fixed frame 5, the pressing force is exerted on the pressed member 73.
Fixed to On the other hand, as shown in FIG. 6B, the cam portion 75 retreats the second plate 72 downward, moves the pressed member 73 away from the top plate 51 of the fixed frame 5, and moves the moving frame 6. Enable. Note that the end 74a of the operation shaft 74 in FIG. 7 can be given a rotational force by a tool, a lever, or the like (not shown).

Next, a method of adjusting the fixed position will be described. The goods conveyed on the conveyor C in FIG.
If the size of the tray is different and the size of the item is significantly different, it is necessary to adjust the label attaching position. In this case, first, the operation shaft 74 is rotated from the fixed state in FIG. 6A to the movable state in FIG. 6B. Thereafter, the label applicator B of FIG. 1B is moved together with the label printer A and the moving frame 6 to a desired position in the longitudinal direction W. After this movement, FIG.
The operating shaft 74 is rotated again from the movable state of (b) to bring it into the fixed state of FIG.

When the pressing force is applied to the moving frame 6 to fix the moving frame 6, the moving frame 6 is distorted, and the roller 63 does not rotate smoothly. . On the other hand, in this embodiment, since the engagement pipe 70 is engaged with the through hole 64 for engagement of the moving frame 6, the pressing force of the pressed member 73 and the cam portion 75 is not applied to the moving frame 6. Therefore, there is no possibility that the moving frame 6 is distorted.
Therefore, since the roller 63 rotates smoothly, the moving operation of the label pasting machine B in FIG. 1 is facilitated.

[0040]

As described above, according to the present invention,
Since the one-way clutch is provided and the first and second friction surfaces having different frictional forces are provided, a large tension necessary for peeling off the label can be applied to the backing paper during winding. On the other hand, a small tension can be applied to the backing sheet so that the backing sheet does not loosen, and the backing sheet does not hang down, so that the backing sheet does not interfere with the article. Moreover, since the tension of the backing sheet during the back feed is small, the amount of rewinding of the backing sheet due to the rotation of the printing roller is the desired amount, so that the accuracy of the stop position of the label to be printed next is improved. Also, when backing the backing paper,
Since not only the print roller but also the take-up shaft is rotated, one motor can rotate both the print roller and the take-up shaft, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front and side layout diagram of a label printing and sticking apparatus according to the present invention.

FIG. 2 is a schematic front layout diagram showing a label printer showing one embodiment of the present invention.

FIG. 3 is a partially sectional front view showing the structure of a printing unit.

FIG. 4 is a front view showing a method of removing a printing unit.

FIG. 5 is a longitudinal sectional view showing a main part of the winding device.

FIG. 6 is a schematic cross-sectional view of an adjustment device for a fixed position.

FIG. 7 is a longitudinal sectional view of the same.

FIG. 8 is a schematic front view of a conventional winding device.

FIG. 9 is a longitudinal sectional view of the same.

FIG. 10 is a longitudinal sectional view of another conventional winding device.

[Explanation of symbols]

 1: winding device 20: printing roller 29: peeling shaft 30: winding roller 30a: end surface 31: winding shaft 32: one-way clutch 33: clutch member 34: first friction plate 35: spring member 36: second friction plate 3A: First friction surface 3B: Second friction surface L: Printing paper L1, L2: Label L3: Mount

Claims (4)

[Claims] A take-up roller rotatably mounted on a take-up shaft driven by a motor is rotated forward in the take-up direction while slipping with respect to the take-up shaft, so that the backing sheet sent from the print roller is rotated. A label printer that winds around the winding roller, wherein the one-way clutch transmits a rotational force of the winding shaft so that the winding roller rotates forward with the normal rotation of the winding shaft; and A first friction surface for transmitting the winding force from the one-way clutch to the winding roller and allowing the winding roller to slip; a friction force set to be smaller than the first friction surface; A second friction surface for providing a rotational resistance to the winding roller by the frictional force during feeding. 2. A take-up roller rotatably mounted on a take-up shaft driven by a motor is rotated forward in the take-up direction while slipping with respect to the take-up shaft, so that the backing sheet sent from the print roller is rotated. A label printer that winds around the take-up roller, wherein the one-way clutch transmits torque when the take-up shaft rotates forward, and the label printer is fixed to the one-way clutch, and is connected to the take-up shaft via the one-way clutch. A mounted clutch member, a spring member for pressing an end surface of the winding roller toward one end surface of the clutch member, and transmitting a winding force from the clutch member to the winding roller when winding the mount. A first friction surface that allows the take-up roller to slip with the clutch member; and a frictional force set to be smaller than the first friction surface. Label printer that includes a second friction surface to impart rotational resistance on the take-up roller by friction forces. 3. A take-up roller rotatably mounted on a take-up shaft driven by a motor is rotated forward in the take-up direction while slipping with respect to the take-up shaft, so that the take-up roller is mounted on the backing sheet sent from the print roller. A label printer that winds the backing sheet around the winding roller in a state where tension is applied, and peels off the label from the backing sheet by a peeling shaft provided in the vicinity of the printing roller. A one-way clutch that transmits torque when the take-up shaft rotates forward, and does not transmit torque when the take-up shaft rotates reversely; the one-way clutch is fixed to the one-way clutch, and the winding is performed via the one-way clutch. A clutch plate mounted on a shaft; a spring member for pressing an end surface of the winding roller toward a first end surface of the clutch plate; and a spring member provided between the winding roller and a first end surface of the clutch plate. A first friction plate that transmits a winding force from the clutch plate to a winding roller during winding of the mount and allows the winding roller to slip between the clutch plate and a second end surface of the clutch plate; A second friction plate, wherein the friction force is set to be smaller than the first friction plate, and the second friction plate imparts rotational resistance to the winding roller by the friction force when the backing paper is back-fed. 4. The label printer according to claim 1, wherein the print roller and the take-up shaft are driven to rotate by a single motor.