JP4306869B2 - Label expansion mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, bottles, in mounting the stretch label to be mounted body such as bottles, relates stretch label on the label expansion Organization for increasing expansion than the outer diameter of the mounted body.
[0002]
[Prior art]
A label mounting device for mounting a cylindrical stretch label on the outer peripheral surface of a mounted object such as a bottle or a bottle is usually provided with a label expanding mechanism having an opening / closing claw, and a cylinder is attached to the closed opening / closing claw. After inserting the stretch label, the opening and closing claws are opened to expand the stretch label larger than the outer diameter of the attached body, and the attached body is inserted into the expanded stretch label. A stretch label is attached to the body.
[0003]
An example of the label expanding mechanism is shown in FIG. The label expanding mechanism 50 includes an annular disk 51 having a cam groove 52, a sliding member 53 that slides on the annular disk 51 in the radial direction of the annular disk 51, and a stretch fixed to the sliding member 53. A pair of opening and closing claws 54 of the same shape for expanding the label L is provided, and a cam follower 55 that fits into a cam groove 52 formed in the annular disk 51 is attached to the sliding member 53. .
[0004]
As shown in the figure, the cam groove 52 has a large diameter corresponding to the open position while extending in the rotation direction from the small diameter concentric circle D1 corresponding to the closed position with the rotation center of the annular disk 51 as the center. When the annular disk 51 is rotated in the direction indicated by the arrow in the drawing by a drive mechanism (not shown), the sliding member 53 is moved into the cam groove as shown in FIG. The two pairs of opening / closing claws 54 are closed by moving to the inside in the radial direction of the annular disk 51 by the cam mechanism including the 52 and the cam follower 55.
[0005]
Then, as shown in FIG. 14, when the cylindrical stretch label L is inserted into the closed open / close claw 54 and the annular disk 51 is rotated in the opposite direction, the two pairs of open / close claws 54 are respectively opened and closed. The stretch label L inserted into the nail 54 is expanded.
[0006]
[Problems to be solved by the invention]
By the way, since the label expanding mechanism 50 as described above can only deal with a stretch label L having a specific size (diameter), the stretch label to be expanded is changed to a stretch label having a different size (diameter). If this is done, it must be replaced with another circular disk in which a cam groove corresponding to the changed stretch label is formed. It takes time to change the setup, and for each stretch label having a different size (diameter). There is a problem that a circular disk must be prepared for each.
[0007]
In particular, in a rotary type label mounting apparatus having a number of label mounting heads as described above and having a large number of label mounting heads, all the annular disks must be replaced for each label mounting head. It will take a considerable amount of time. In addition, since the number of annular disks to be prepared is considerably increased, there is a problem that the cost of parts is increased and a storage place for the parts must be secured.
[0008]
Accordingly, an object of the present invention is to provide a label expansion Organization that can correspond to a plurality of stretch labels of different sizes (diameter).
[0009]
[Means for solving the problems and effects thereof]
In order to solve the above-mentioned problem, the present invention includes an opening / closing claw that expands by opening a stretch label inserted in a closed state, and a driving means that opens and closes the opening / closing claw,
Rotating body in which the drive means has a cam groove extending from a small-diameter concentric circle corresponding to the closed position to a large-diameter concentric circle corresponding to the open position while extending in the rotation direction with the rotation center as the center. And cam followers that are respectively attached to the opening and closing claws and fit into the cam grooves, and by rotating the rotating body in forward and reverse directions, the cam followers are arranged on the concentric circle having a small diameter and the concentric circle having a large diameter. In the label expanding mechanism in which the opening and closing claw is opened and closed between the open position and the closed position by moving between the upper and lower positions, the cam groove has an intermediate position of the rotating body. A stop region of the opening / closing claw that extends along a concentric circle having a medium diameter centered on the rotation center is set, and is set between the one end and the other end of the cam groove and at an intermediate position between the one end of the cam groove. Said stop area and The opening / closing claw is opened and closed by moving the cam follower between the stop region set at an intermediate position of the cam groove and the other end of the cam groove, so that at least three different sizes (diameters) are obtained. It corresponds to the kind of stretch label . When multiple pairs of opening and closing claws with different opening and closing directions are provided, the “small diameter concentric circles” corresponding to the closed position and the “large diameter concentric circles” corresponding to the opened position are the same for all opening and closing claws. If the closing position and the opening position are different for each pair of opening and closing claws, there are multiple concentric circles with different diameters for each pair of opening and closing claws. Become. In other words, the “small-diameter concentric circle” and the “large-diameter concentric circle” mentioned here exist for each opening / closing claw, and include those having different opening / closing strokes for each opening / closing claw.
[0010]
With the label expanding mechanism configured as described above, the opening / closing claw can be opened / closed between one end and the other end of the cam groove or the intermediate position of the cam groove can be set only by changing the rotation angle of the rotating body. The open / close claw can be opened / closed between the stop area and the open / close claw can be opened / closed between the stop area set at the intermediate position of the cam groove and the other end. Without doing so, it is possible to support at least three types of stretch labels having different sizes (diameters) and stretchability (two types of diameters at the opening position).
[0011]
Further, since the stop region set at the intermediate position of the cam groove inevitably has a certain distance (length), even if the rotation angle of the rotating body is not set more accurately than necessary, most of the stop region is set. In this case, the cam follower stops within the stop region, and the stop position of the opening / closing claw does not slightly shift every time the opening / closing operation is performed. Furthermore, as in the label expanding mechanism according to claim 3, it is preferable to set stop areas of the opening and closing claws extending along the small-diameter concentric circle and the large-diameter concentric circle at both ends of the cam groove.
[0012]
In particular, in the case where a plurality of stop regions are set at the intermediate position of the cam groove as in the label expanding mechanism according to claim 2, it corresponds to three or more types of stretch labels having different sizes (diameters). This makes it possible to increase versatility.
[0013]
Therefore, by installing the label expanding mechanism as described above in the label mounting device, it is possible to easily perform setup change when the stretch label is changed, and to minimize the number of replacement parts. There is an effect that it can be suppressed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 shows a label mounting system 1 for mounting a cylindrical stretch label (hereinafter referred to as a label) L formed of an elastic stretch film made of polyethylene resin on a PET bottle (hereinafter referred to as a bottle) B. The label mounting system 1 includes a bottle feeder 2 composed of a belt conveyor 7, a star wheel 2a, a screw conveyor 2b, and a star wheel 2c, and a long length fed from a base material roll by a base material feeding portion 3a. A label supply device 3 that sequentially forms the label L while sequentially cutting the label forming base material M and supplies the label L to the first label delivery position α, and the first label delivery position by the label supply device 3 a label delivery device 4 for receiving the label L supplied to α and transporting it to the second label delivery position β, and a bottle supply position γ The bottle B supplied from the bottle supply device 2 is received and conveyed to the bottle delivery position δ, and the label L conveyed by the label delivery device 4 is received at the second label delivery position β. Is transported from the bottle supply position γ to the bottle delivery position δ, and the rotary type label mounting device 5 for mounting the label L on the bottle B and the bottle B to which the label L is mounted by the label mounting device 5 are unloaded. And a bottle conveying device 6 comprising a star wheel 6a, a screw conveyor 6b and a belt conveyor 7.
[0015]
The label-forming base material M is formed by continuously connecting cylindrical labels L attached to the bottle B, and is wound around a drum in a state of being folded into a sheet shape in the base material feeding portion 3a. ing. Further, the sheet-like label forming base material M fed from the base material feeding portion 3a is folded in the middle of its supply so that it can be easily opened into a cylindrical shape when the label L is attached to the bottle B. (See FIG. 1).
[0016]
As shown in FIGS. 1 and 2, the label mounting device 5 is fixed on a concentric circle around the rotation axis via a plurality of support arms 11 and 12 projecting radially from the rotation axis (not shown). A plurality of label mounting heads 10 mounted at intervals are provided, and the cylindrical label L folded into a sheet shape received at the second label delivery position β by each label mounting head 10 is an outer diameter of the bottle B. The expanded label L is attached to the body of the bottle B while the bottle B received at the bottle supply position γ is being transported to the bottle delivery position δ. .
[0017]
The label mounting head 10 includes a label expanding means 20 that expands the cylindrical label L folded in a sheet shape received at the second label delivery position β larger than the outer diameter of the bottle B at the label mounting level. The bottle B placed on the lifting platform 43 at the lower position of the label mounting level at the bottle supply position γ is inserted into the label L expanded at the label mounting level by raising the lifting platform 43. It is comprised from the raising / lowering means 40. FIG.
[0018]
As shown in FIG. 2, the label expanding means 20 receives a label L folded in a sheet shape delivered by the label delivery device 4 at a position directly above the bottle B placed on the lifting platform 43. A label opening mechanism 21 that opens in a shape, and a label expanding mechanism 25 that expands the label L opened by the label opening mechanism 21 larger than the outer diameter of the bottle B by an opening / closing claw. The expansion mechanism 25 is fixedly installed at the label mounting level by the support arm 11, and the label opening mechanism 21 is disposed at a position immediately above the label expansion mechanism 25 so as to be movable up and down.
[0019]
As shown in FIGS. 2 to 5, the label opening mechanism 21 is sucked into the clamp member 22 by sucking from a pair of clamp members 22 that can be opened and closed, and a suction port formed in the clamping portion 22 a of the clamp member 22. It comprises a suction means (not shown) for sucking and holding both sides of the sandwiched label L by the clamp member 22, an opening / closing drive means 23 for opening and closing the clamp member 22, and a lifting means 24 for raising and lowering the clamp member 22. The label opening mechanism 21 receives the label L folded in a sheet shape conveyed by the label delivery device 4 when the clamp member 22 sandwiches the label L at the second label delivery position β, and the suction means operates. In this state, the clamp member 22 is opened in a state where both surfaces of the label L are sucked and held by the holding portions 22a. By separating the two sides of the label L to each other, so as to open the label L into a tubular shape.
[0020]
As shown in FIGS. 1 and 3, the label delivery device 4 has a sheet-like label L attached to the tip of an arm that rotates so as to pass through the first label delivery position α and the second label delivery position β. It has a “U” -shaped label adsorbing portion 4a that adsorbs one side, and the label L adsorbed on the label adsorbing portion 4a is sandwiched by the clamping portion 22a of the clamp member 22 and separated from the label adsorbing portion 4a. Thus, the delivery of the label L is performed.
[0021]
As shown in FIGS. 2 to 5, the opening / closing drive means 23 includes a spring 23 a that normally urges the clamp member 22 in the closing direction, and a pair of rollers 23 b that are attached to the base end side of the clamp member 22. And an operating rod 23c to which a cam member 23d having a cam surface that comes into contact with both rollers 23b by being inserted between the rollers 23b is attached to the lower end portion. As shown in FIG. 2, a cam follower 23e that is supported by the support arm 12 so as to be movable up and down and that fits into a cam groove (not shown) is attached to the upper end portion via an attachment arm 23f.
[0022]
In the opening / closing drive means 23 configured as described above, as shown in FIG. 5B, when the cam follower 23e is lowered by the cam groove, the operation rod 23c is lowered accordingly, and the lower end portion of the operation rod 23c. The cam member 23d attached to the roller 23b pushes the roller 23b to open the clamp member 22. Therefore, the clamp member 22 is opened and closed by moving the operating rod 23c up and down by the cam mechanism including the cam groove and the cam follower 23e.
[0023]
As shown in FIG. 2, the elevating means 24 includes an operating rod 24a supported by the support arm 12 so as to be movable up and down, a support member 24b for attaching the clamp member 22 to the lower end of the operating rod 24a, and an operating rod 24a. And a cam follower 24c fitted in a cam groove (not shown) that is attached to the upper portion of the cam by a mounting arm 24d. By moving the operating rod 24a up and down by a cam mechanism comprising the cam groove and the cam follower 24c, the clamp The member 22 is moved up and down.
[0024]
As shown in FIGS. 6 and 7, the label expanding mechanism 25 is supported by an annular disk 26 having a cam groove 27 rotatably supported by the support arm 11, and slidable in the radial direction of the annular disk 26. And an opening / closing claw 29 fixed to the sliding member 28 for expanding the label L. The opening / closing claw 29 has a lower end of the label L to be inserted. By contact, step portions 29a for positioning the label L are formed.
[0025]
Further, cam followers 30 that fit into cam grooves 27 formed in the annular disk 26 are respectively attached to the sliding members 28, and the cam grooves 27 are formed on the annular disk 26 as shown in FIGS. 7 and 8. Centering on the center of rotation, it extends from a concentric circle C1 having a small diameter corresponding to the closed position to a concentric circle C2 having a large diameter corresponding to the open position while extending in the rotation direction. A stop region 27a of the opening / closing claw 29 is formed extending along a concentric circle C3 having a medium diameter centered on the rotation center.
[0026]
Therefore, as shown by the arrow in FIG. 7, when the annular disk 26 rotates, the cam groove 27 formed in the annular disk 26 moves, so that the cam follower 30 moves between the concentric circle C1 and the concentric circle C2. Thus, the opening / closing claw 29 moves between the open position (see FIG. 7) and the closed position (see FIG. 8).
[0027]
In this embodiment, the annular disk 26 is rotated about 90 degrees so that the cam follower 30 is moved over the entire length of the cam groove 27, but depending on the size (diameter) of the label L to be expanded. By rotating the annular disk 26 so that the cam follower 30 moves between the concentric circle C1 and the concentric circle C3, the state shown in FIG. 8 can be used as the closed state, and the state shown in FIG. 9 can be used as the open state. Further, by rotating the annular disk 26 so that the cam follower 30 moves between the concentric circle C3 and the concentric circle C2, the state shown in FIG. 9 is used as the closed state, and the state shown in FIG. 7 is used as the open state. It is also possible to do.
[0028]
As shown in FIGS. 6 and 7, a shaft 32 is rotatably supported on the support arm 11 via a bearing 31 on the outside of the annular disk 26. A gear 33 that meshes with teeth formed on the outer peripheral surface 26 and an arm 34 with a cam follower 35 attached to the tip are fixed. The cam follower 35 is fitted in a cam groove 36 formed in an annular plate member disposed along the rotation track of the mounting head 10.
[0029]
Therefore, when the arm 34 is swung by the cam mechanism including the cam groove 36 and the cam follower 35, the gear 33 fixed to the shaft 32 rotates, and accordingly, the annular disk 26 with which the gear 33 is engaged rotates. Therefore, the two pairs of opening / closing claws 29 attached to the sliding member 28 are opened and closed in the radial direction of the annular disk 26 by the cam mechanism including the cam groove 27 and the cam follower 30.
[0030]
As shown in FIG. 2, the bottle lifting / lowering means 40 includes an operation rod 41 supported by the support arm 12 so as to be movable up and down, and a bottle B attached to the lower end of the operation rod 41 via an attachment arm 42. And a cam follower 45 that is attached to the operating rod 41 via a mounting arm 44 and fits in a cam groove (not shown). The cam mechanism includes the cam groove and the cam follower 45. The elevator 43 is moved up and down by moving the operating rod 41 up and down.
[0031]
In addition, the bottle elevating means 40 holds the bottle B on the elevating table 43 while lowering the elevating platform 43 while the bottle B is placed, while descending in conjunction with the descending operation of the elevating platform 43. The holding means includes an operating rod 46 that is supported by the support arm 12 so as to be movable up and down, and a head that fits into the head of the bottle B attached to the lower end of the operating rod 46. It comprises a holder 47 and a cam follower 49 fitted in a cam groove (not shown) attached to the center of the operation rod 46 via a mounting arm 48, and the operation rod 46 is moved up and down by a cam mechanism comprising the cam groove and the cam follower 49. By moving it, the head holder 47 is moved up and down.
[0032]
As shown in FIG. 1, the label mounting device 5 configured as described above first clamps a cylindrical label L folded into a sheet that has been conveyed to the label delivery position β by the label delivery device 4. The member 22 is received by being clamped, but at the position immediately before the second label delivery position β, as shown in FIGS. 10A and 10B, the mounting head 10 is fixedly installed at the label mounting level. The head holder 47 and the clamp member 22 are positioned above the open / close claw 29, and the mounting head 10 approaches the label delivery position β as shown in FIGS. The clamp member 22 is gradually closed and the opening / closing claw 29 is also closed. As shown in FIG. 5C, the clamp member 22 grips the label L at the label delivery position β, thereby the label delivery device 4. Receives Luo label L, then the label L is conveyed to the front of the left bottle delivery position δ of the state (see FIG. (D)). In addition, at this time, as shown to the same figure (a)-(d), the bottle B with which the label L was mounted | worn by the previous process is mounted in the raising / lowering base 43, and it shows to the figure (e). In this way, the bottle B with the label L attached is delivered to the bottle transport device 6 at the bottle delivery position δ.
[0033]
Then, as shown in FIG. 5E, the clamp member 22 holding the label L is opened, and after opening the label L into a cylindrical shape, the clamp member 22 and the head holder 47 are gradually lowered. On the other hand, as shown in FIG. 11 (f) (FIG. 11 (f)), at the bottle supply position γ, the label L opened in a cylindrical shape (elliptical shape) is inserted into the open / close claw 29 in the closed state. At the same time, a new bottle B delivered from the bottle supply device 2 is placed on the lifting platform 43.
[0034]
Next, as shown in FIG. 11 (g), the head holder 47 is lowered and the head holder 47 pushes down the label L inserted into the opening / closing claw 29, so that the lower end of the label L is the opening / closing claw 29. Abutting on the stepped portion 29a, the label L is reliably positioned at the label mounting level, and the lifting platform 43 on which the bottle B is placed starts to rise. In addition, when the label L is positioned by the head holder 47, the suction of the clamp member 22 is released, and at the same time, the clamp member 22 is slightly opened, and the suction holding of the label L by the clamp member 22 is released. It is in the state.
[0035]
In this way, when the label L is positioned at the label mounting level, the opening / closing claw 29 is opened as shown in FIG. The head holder 47 rises slightly and waits. When the label L is expanded at the label mounting level, the clamp member 22 is slightly closed, so that the label L is pressed against and held by the opening / closing claw 29, and as shown in FIG. The bottle B rising by the table 43 is inserted into the expanded label L, and the head of the bottle B is fitted into the head holder 47.
[0036]
In this state, since the upper end portion of the label L above the opening / closing claw 29 is in close contact with the outer peripheral surface of the body portion of the bottle B, as shown in FIG. 12 (j) (FIG. 12 (j)) After releasing the gripping of the label L by the clamp member 22, the clamp member 22 is raised, and the label L is held in the bottle B by gripping the upper end portion of the label L that is in close contact with the bottle B together with the bottle B. Is done.
[0037]
Then, as shown in FIG. 12 (k), when the lifting platform 43, the head holder 47, and the clamp member 22 are all raised, the bottle B is temporarily lifted while the clamp member 22 holds the label L on the bottle B. When the opening / closing claw 29 is removed from the label L to cancel the expansion of the label L, the label L is completely attached to the bottle B.
[0038]
Here, when the clamp member 22 is opened, the holding of the label L with respect to the bottle B is released, and as shown in FIG. After retracting the mounted bottle B from the label mounting level, the head holder 47 rises and returns to the original position shown in FIG. 10A, and as described above, at the bottle delivery position δ, the label L The bottle B to which is attached is delivered to the bottle conveying device 6.
[0039]
As described above, the label expanding mechanism 25 employed in the label mounting device 5 is provided with the stop region 27a of the opening / closing claw 29 in advance at the intermediate position of the cam groove 27 constituting the cam mechanism for driving the opening / closing claw 29. Therefore, as described above, by moving the cam follower 30 over the entire length of the cam groove 27, the opening / closing claw 29 can be opened and closed with a large stroke, and one end side of the cam groove 27 starting from the stop region 27a or By moving the cam follower 30 to the other end side, the opening / closing claw 29 can be opened / closed with a small stroke on the closing side or the opening side when the opening / closing claw 29 is largely opened / closed. Accordingly, it is possible to expand at least three types of labels L having different sizes (diameters) and stretchability simply by changing the rotation angle of the annular disk 26.
[0040]
In the label expanding mechanism 25, the stop region 27a set at the intermediate position of the cam groove 27 has a certain length (about 1.5 to 2 times the diameter of the cam follower 30). When the cam follower 30 is moved from the stop area 27a as a starting point, the cam follower 30 normally does not come off from the stop area 27a without stopping the opening / closing claw 29 even if the rotation angle of the annular disk 26 is not set more accurately than necessary. It is possible to reliably stop at a predetermined position corresponding to the region 27a.
[0041]
Therefore, in the label mounting device 5 having such a label expanding mechanism 25, the opening / closing claw can be formed by the three types of opening / closing patterns as described above only by changing the rotation angle of the annular disk 26 by changing the cam groove 36. 29 can be opened and closed, and if it matches the opening and closing pattern, a plurality of types of labels L can be expanded without exchanging the annular disk 26 having the cam groove 27, so that versatility is high. When the label L is changed, the setup change can be easily performed in a short time, and the replacement parts can be minimized.
[0042]
In this embodiment, only one stop region 27a is set at the intermediate position of the cam groove 27. However, a plurality of stop regions can be set at the intermediate position of the cam groove 27. This makes it possible to deal with three or more types of labels having different sizes (diameters).
[0043]
Further, in this embodiment, as shown in FIG. 8, both ends of each cam groove 27 are the same concentric circle so that the two pairs of opening and closing claws 29 are all located on the same concentric circle in the closed state or the opened state. Although it is located on C1 and C2, it is not limited to these, for example, another pair of opening and closing claws so that another pair of opening and closing claws enter inside the pair of opening and closing claws in the closed state. One end of the cam groove that opens and closes the pair of opening and closing claws extends further to the inside than one end of the cam groove that opens and closes the pair of opening and closing claws, thereby changing the opening and closing stroke for each pair of opening and closing claws It is also possible to reduce the area of the region surrounded by the open / close claw in the state.
[0044]
Further, in this embodiment, the case where the stretch label is attached to the PET bottle has been described. However, the attached body is not limited to the PET bottle as described above, and the label expanding mechanism and the label attaching apparatus of the present invention. Can be applied when a stretch label is attached to various containers such as bottles and cans and cylindrical bodies.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing a label mounting system including an embodiment of a label mounting apparatus according to the present invention.
FIG. 2 is a schematic view showing a label mounting head of the label mounting apparatus of the above.
FIG. 3 is a cross-sectional view showing a label opening mechanism in the label mounting head of the above.
FIG. 4 is a plan view showing a clamp member in the label opening mechanism.
FIG. 5 is a side view showing the opening / closing driving means of the clamp member.
FIG. 6 is a cross-sectional view showing a label expanding mechanism in the label mounting head of the above.
FIG. 7 is a plan view showing the internal structure of the label expanding mechanism according to the first embodiment.
FIG. 8 is a schematic view showing a state in which the opening / closing claw is closed in the label expanding mechanism.
FIG. 9 is a schematic view showing a state in which the opening / closing claw is in an intermediate position between an open position and a closed position in the label expanding mechanism according to the embodiment;
FIG. 10 is an operation explanatory view showing a label mounting operation of the label mounting apparatus according to the embodiment.
FIG. 11 is an operation explanatory view showing a label mounting operation of the above label mounting apparatus.
FIG. 12 is an operation explanatory view showing a label mounting operation of the above label mounting apparatus.
FIG. 13 is a schematic configuration diagram showing a conventional label expanding mechanism.
FIG. 14 is a schematic configuration diagram showing a state in which the opening / closing claw is closed in the label expanding mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Label mounting system 5 Label mounting apparatus 10 Label mounting head 20 Label expansion means 25 Label expansion mechanism 26 Annular disk 27 Cam groove 27a Stop area 29 Opening / closing claw 30 Cam follower B Bottle L Stretch label

Claims (3)

An opening / closing claw that expands by opening a stretch label inserted in a closed state; and a driving means for opening / closing the opening / closing claw,
Rotating body in which the drive means has a cam groove extending from a small-diameter concentric circle corresponding to the closed position to a large-diameter concentric circle corresponding to the open position while extending in the rotation direction with the rotation center as the center. And a cam follower that is attached to each of the opening and closing claws and fits into the cam groove,
By rotating the rotating body in the forward and reverse directions, the cam follower is moved between the concentric circle having a small diameter and the concentric circle having a large diameter, so that the opening / closing claw is moved between the open position and the closed position. In the label expansion mechanism that is opened and closed with
In the cam groove, a stop region of the opening / closing claw that extends along a concentric circle with a center diameter around the rotation center of the rotating body is set at an intermediate position thereof ,
Between the one end of the cam groove and the other end, between one end of the cam groove and the stop region set at an intermediate position, or other than the stop region and the cam groove set at an intermediate position of the cam groove. A label expanding mechanism characterized by corresponding to at least three types of stretch labels having different sizes (diameters) by opening and closing the opening / closing claw by moving the cam follower between ends .   The label expanding mechanism according to claim 1, wherein a plurality of the stop areas are set at an intermediate position of the cam groove. 3. The label expanding mechanism according to claim 1, wherein stop areas of the opening and closing claws extending along the small diameter concentric circle and the large diameter concentric circle are respectively set at both ends of the cam groove.

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