JP2004210307A - Cylindrical film cutting mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical film cutting mechanism capable of prolonging the service life of a cutting blade. <P>SOLUTION: The cylindrical film cutting mechanism comprises a first rotating body 32 rotatably supported so as to surround a mandrel 10, a first gear 32a fitted to the first rotating body 32, a second rotating body 33 rotatably supported by the first rotating body 32, a cutting blade 34 turnably supported by the second rotating body 33, a second gear 35 fitted to a rotary shaft 34a to turnably support the cutting blade 34 and engaged with the first gear 32a, a drive motor 36 to rotate the second rotating body 33 at a predetermined speed, a coil spring 37 to connect the first rotating body 32 and the second rotating body 33 to each other, a brake motor 38 to brake the rotation of the first rotating body 32, and a stopper 39 fitted to the second rotating body 33 while being fitted in a long hole 32b formed in the first rotating body 32, and is disposed so that the center of rotation of the cutting blade 34 is deviated from the center of the mandrel 10. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting mechanism for cutting a long cylindrical film, which is mounted on, for example, a labeling device for mounting a cylindrical shrink label or a stretch label on a bottle container or the like.
[0002]
[Prior art]
As this type of labeling apparatus, for example, there is one as shown in FIG. This labeling device 60 is for inserting a cylindrical label L formed of a shrink film into the body of the container B, and as shown in the figure, the cylindrical labels L are continuously connected. Further, the long strip-shaped tubular film LF folded in a sheet shape is pulled down to the cutting position by the feeding roller 62 while being opened in a predetermined state by being inserted into the cylindrical mandrel 61, and cut at the cutting position. After the individual labels L are formed by sequentially cutting to a predetermined length by the cutting mechanism 63 installed in the printer, the opened individual labels L are sequentially sent out to a predetermined label insertion position by the sending roller 64. The label L is inserted into the body of the container B sequentially transported to the label insertion position.
[0003]
The cutting mechanism 63 moves the cutting blade 63a into the cylindrical film LF while rotating the cutting blade 63a along the outer peripheral surface of the cylindrical film LF outside the cylindrical film LF opened by the mandrel 61. The cutting mechanism 63 is arranged so that the center of the open tubular film LF and the rotation center of the cutting blade 63a coincide with each other. Have been.
[0004]
[Patent Document 1]
JP, 2002-154506, A
[Problems to be solved by the invention]
By the way, in the cutting mechanism 63 as described above, a cutting blade 63a having a certain length is used. As shown in FIG. 7, the center of the opened tubular film LF and the cutting blade 63a are Since the center of rotation coincides with the rotation center, when cutting the tubular film LF, only a predetermined length portion from the tip of the cutting blade 63a always enters the tubular film LF, and the identification is performed. Only the portion will be used for cutting the tubular film LF. Therefore, in such a cutting mechanism 63, there is a problem that the life of the cutting blade 63a is shortened and the cutting blade 63a must be frequently replaced.
[0006]
Accordingly, an object of the present invention is to provide a tubular film cutting mechanism that can maximize the life of a cutting blade so that the cutting blade does not need to be replaced frequently.
[0007]
Means for Solving the Problems and Their Effects
In order to solve the above problem, the invention according to claim 1 is configured to cut the cylindrical film by causing a cutting blade that rotates and moves outside the open cylindrical film to enter the cylindrical film. In the tubular film cutting mechanism, in the cutting process after the cutting blade has entered the tubular film, a cutting portion of the cutting blade with respect to the tubular film is changed. The present invention provides a mechanism for cutting a film.
[0008]
As described above, in this cutting mechanism, in the cutting process after the cutting blade has entered the tubular film, the cutting portion of the cutting blade with respect to the tubular film is changed. Only the part is not used for cutting the tubular film, and the tubular film can be cut while widely using the severable area of the cutting blade, so that the effect of extending the life of the cutting blade is obtained. can get.
[0009]
In particular, as in the invention according to claim 2, a cutting blade rotatably supported on the outside of the tubular film in an open state, a rotation driving unit for rotating the cutting blade, and the cutting blade, Providing advance / retreat driving means for advancing / retreating between an entry position for entering the tubular film and a retracted position separated from the tubular film, and causing the cutting blade to enter the entry position while rotating and moving, In the tubular film cutting mechanism that is configured to cut the tubular film, the rotation center of the cutting blade is eccentric from the center of the tubular film, and if it is disposed, it is in a state of entering the entry position. As the cutting blade rotates outside the tubular film, the cutting portion of the cutting blade with respect to the tubular film naturally changes.
[0010]
Therefore, in this cutting mechanism, it is not necessary to employ a complicated mechanism in order to change the cutting portion of the cutting blade with respect to the cylindrical film, and it is possible to extend the life of the cutting blade easily and inexpensively.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 shows a labeling device equipped with a cutting mechanism of the present invention. As shown in the figure, the labeling apparatus 1 separates individual shrink labels L from a long tubular film CF in a state of being folded into a sheet, in which cylindrical shrink labels L are continuously connected. By sequentially transmitting the shrink labels L to the label insertion position α, the shrink labels L are inserted into the body of the container B sequentially conveyed to the label insertion position α by the belt conveyor C at a predetermined conveyance pitch. A metal mandrel 10 which is opened in a predetermined state by inserting a tubular film CF fed from a material roll (not shown) mounted on a roll feeder, and which is inserted into the mandrel 10. Feeding means 20 for feeding the cylindrical film CF to the lower end side of the mandrel 10, and a cylindrical film CF opened by the mandrel 10 for a predetermined length. And a label sending means 40 for sending the shrink label L separated from the tubular film CF by the cutting mechanism 30 to the label insertion position α.
[0012]
In addition, the cylindrical film CF (shrink label L) is formed of a heat-shrinkable film having a thickness of 20 to 80 μm substantially uniaxially stretched in the circumferential direction and made of a polypropylene-based resin, a polystyrene-based resin, or the like. It is supplied as a raw roll wound around.
[0013]
As shown in FIG. 1, the mandrel 10 has a cylindrical main body 10 a having an upper end formed in a conical column or a wedge shape, and a conical column or wedge formed to extend upward from the main body 10 a. And a guide plate 10b fitted to the upper end side of the main body 10a. The main body 10a has a pair of left and right upper rollers 11 mounted above the cutting position β. A pair of left and right lower rollers 12 is attached to the lower end of 10a.
[0014]
As shown in FIG. 1, the film feeding means 20 sandwiches the cylindrical film CF inserted into the mandrel 10 between the upper film 11 and the upper roller 11 attached to the mandrel 10, and A pair of right and left feeding rollers 21 for feeding is provided. The feeding roller 21 contacts the lower roller 11 of the upper roller 11 of the mandrel 10 to support the mandrel 10 via the upper roller 11. It has become.
[0015]
As shown in FIGS. 1 to 3, the cutting mechanism 30 is fixed to the base member 31 via a bearing so as to surround the base member 31 fixed to the frame 30a and the mandrel 10 (tubular film CF). A first rotatable body 32 rotatably supported, a first gear 32 a attached to the first rotatable body 32, and a fixed position rotating about a rotation center of the first rotatable body 32, A second rotating body 33 supported by the first rotating body 32 via a bearing; and a plurality of cutting blades 34 rotatably supported by the second rotating body 33 via a rotating shaft 34a. A plurality of second gears 35, each of which meshes with the first gear 32a of the first rotating body 32, attached to each of the rotating shafts 34a rotatably supporting the respective cutting blades 34; Drive mode for rotating the body 33 at a constant speed 36 and a plurality of coil springs 37 interconnecting the first rotating body 32 and the second rotating body 33 so that the first rotating body 32 rotates in the same direction as the second rotating body 33 rotates. And a brake motor 38 that generates a torque in a direction opposite to the rotation direction of the second rotator 33 by applying a current to brake the rotation of the first rotator 32, and a length formed in the first rotator 32. A stopper 39 attached to the second rotating body 33 is provided in a state fitted in the hole 32b. As shown in FIG. 2, the cutting mechanism 30 is provided at the center of the mandrel 10 (tubular film CF). On the other hand, between the upper roller 11 and the lower roller 12 in the mandrel 10, the rotation center of the cutting blade 34, that is, the rotation center of the first rotating body 32 and the second rotating body 33 is eccentric about 1 to 4 mm. Are located.
[0016]
When the first rotator 32 and the second rotator 33 rotate relative to each other, the second gear 35 meshed with the first gear 32a of the first rotator 32 rotates. As shown in FIG. 3A, the stopper 39 attached to the second rotating body 33 is elongated by the urging force of the coil spring 37 formed in the first rotating body 32 as shown in FIG. 32b is held in contact with one end thereof, so that the relative rotation between the first rotating body 32 and the second rotating body 33 is regulated, and the cutting blade 34 is positioned inside the first rotating body 32 having a cylindrical shape. It does not protrude and is held in a retracted position.
[0017]
Therefore, if the drive motor 36 is simply operated without energizing the brake motor 38, the first rotating body 32 and the second rotating body 33 rotate integrally, and the cutting blade 34 When the mandrel 10 (the cylindrical film CF) is rotated outside the mandrel 10 (the tubular film CF) in a state where the mandrel 10 is held at the retracted position without protruding inside the rotating body 32, when the brake motor 38 is energized in the middle thereof, The brake is applied to the first rotating body 32, and the first rotating body 32 moves with respect to the second rotating body 33 until the stopper 39 contacts the other end side of the elongated hole 32b as shown in FIG. The cutting blade 34 rotates relative to the rotation direction in a direction opposite to the rotation direction, and the cutting blade 34 rotates in a state in which the cutting blade 34 protrudes inside the cylindrical first rotating body 32, that is, enters the circumferential groove 13 formed in the mandrel 10. You have to move, So that the tubular film CF which is fitted on the mandrel 10 is disconnected.
[0018]
Further, since the cutting mechanism 30 is arranged such that the rotation center of the cutting blade 34 is eccentric with respect to the center of the mandrel 10 (the tubular film CF), as shown in FIG. Is rotated, the cutting portion of the cutting blade 34 with respect to the circumferential groove 13 (the tubular film CF) formed in the mandrel 10 naturally changes according to the rotational position.
[0019]
The label sending means 40 sandwiches the shrink label L separated from the tubular film CF by the cutting mechanism 30 between the lower roller 12 attached to the lower end of the mandrel 10 as shown in FIG. A pair of right and left delivery rollers 41 for sequentially delivering from the mandrel 10 is provided. With the use of the delivery rollers 41, the shrink labels L separated from the cylindrical film CF are sequentially inserted into the mouth of the container B. .
[0020]
As described above, in the labeling apparatus 1, when cutting the tubular film CF inserted into the mandrel 10, during the cutting process after the cutting blade 34 enters the tubular film CF, the cutting to the tubular film CF is performed. Since the cutting portion of the blade 34 is changed, when cutting the tubular film inserted into the mandrel, in the cutting process after the cutting blade enters the tubular film, the cutting blade cuts the tubular film. Unlike a conventional cutting mechanism in which the portion is always constant, only a specific portion of the cuttable area of the cutting blade is not used for cutting the tubular film, and the cuttable area of the cutting blade 34 is widely used. However, since the tubular film CF can be cut, the effect of extending the life of the cutting blade 34 can be obtained.
[0021]
Further, in the labeling apparatus 1, the cutting mechanism 30 is arranged so that the center of rotation of the cutting blade 34 is eccentric from the center of the mandrel 10 (the cylindrical film CF). Since the cutting site of the cutting blade 34 with respect to the cylindrical film CF is naturally changed, there is no need to employ a complicated mechanism to change the cutting site of the cutting blade 34 with respect to the cylindrical film CF. The life of the cutting blade 34 can be extended easily and inexpensively.
[0022]
In particular, in the labeling apparatus 1, the first rotating body 32 is relatively rotated with respect to the second rotating body 33 by applying a brake to the first rotating body 32 by the brake motor 38. Since the cutting blades 34 are simultaneously rotated, it is not necessary to provide a separate actuator or the like for directly rotating or moving the respective cutting blades 34 on the rotating body side, so that the apparatus can be simplified and downsized. In addition to this, it is possible to obtain an effect that the entering operation and the retreating operation with respect to the tubular film CF can be performed at a higher speed than when the cutting blade 34 is directly driven by such an actuator.
[0023]
In the above-described embodiment, the cutting mechanism 30 is arranged so that the rotation center of the cutting blade 34 is eccentric from the center of the cylindrical film CF, thereby changing the cutting portion of the cutting blade 34 with respect to the cylindrical film CF. However, the present invention is not limited to this. For example, the first rotator 32 and the second rotator 33 are respectively rotated by individual motors, and the rotation speed of the first rotator 32 is appropriately adjusted. When it is changed, the cutting portion of the cutting blade 34 with respect to the tubular film CF can be changed without decentering the rotation center of the cutting blade 34 from the center of the tubular film CF.
[0024]
For example, as shown in FIG. 5, the first rotating body 32 rotating at the same speed as the second rotating body 33 is moved from the start of cutting the tubular film CF to a predetermined rotating speed lower than the rotating speed of the second rotating body 33. After the cutting blade 34 enters the cylindrical film CF by reducing the rotation speed to the rotation speed of the first rotating body 32, the cutting blade 34 enters the cylindrical film CF by maintaining the rotation speed of the first rotating body 32 for a predetermined time. Gradually increase the amount. Then, after increasing the rotation speed of the first rotating body 32 to a predetermined rotation speed that exceeds the rotation speed of the second rotating body 33, the rotation speed of the first rotating body 32 is maintained for a predetermined time, so that the cylindrical shape is obtained. The amount of the cutting blade 34 approaching the film CF is gradually reduced, and the rotation speed of the first rotating body 32 is started to decrease again immediately before the end of the cutting. By matching, the cutting blade 34 may be retracted from the tubular film CF.
[0025]
However, the configuration in which the cutting mechanism 30 is arranged such that the rotation center of the cutting blade 34 is eccentric from the center of the mandrel 10 (the cylindrical film CF) and the cutting portion of the cutting blade 34 with respect to the cylindrical film CF is changed is described in the first embodiment. In comparison with a configuration in which the rotation speed of one rotating body 32 is changed by an individual motor to change the cutting portion of the cutting blade 34 with respect to the tubular film CF, cutting is performed while the rotation angle of the cutting blade 34 is minimized. This is advantageous in that the cutting portion of the blade 34 can be changed.
[0026]
In the above-described embodiment, the four cutting blades 34 are attached to the second rotating body 33, and the second rotating body 33 is rotated by 1/4 to cut the cylindrical film CF inserted into the mandrel 10. However, the present invention is not limited to this, and the number of cutting blades 34 attached to the second rotating body 33 may be 1 to 3 or 5 or more. However, it goes without saying that the rotation angle of the second rotating body 33 required for cutting the tubular film CF must be set according to the number of cutting blades 34 attached to the second rotating body 33.
[0027]
In the above-described embodiment, the cutting blade 34 is rotated in order to move the cutting blade 34 between the retracted position and the entering position. However, the present invention is not limited to this. The blade 34 can be linearly advanced and retracted in the radial direction of the second rotating body 33.
[0028]
In the above-described embodiment, the cutting mechanism 30 mounted on the labeling device 1 that separates the shrink label L from the long tubular film CF and inserts the shrink label L into the body of the container B has been described. However, the cutting mechanism of the present invention is not limited to, for example, a cap seal insertion device that inserts a cylindrical cap seal into the mouth of a container while opening a long cylindrical film to a predetermined length. Needless to say, the present invention can be applied to various devices for cutting into pieces.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a labeling device on which an embodiment of a cutting mechanism according to the present invention is mounted.
FIG. 2 is a sectional view showing a cutting mechanism of the same.
FIGS. 3A and 3B are partially cutaway plan views showing a first rotating body and a second rotating body in the cutting mechanism according to the first embodiment;
FIG. 4 is an explanatory diagram for explaining a state in which a cutting blade enters the tubular film when the tubular film is cut by the cutting mechanism according to the first embodiment.
FIG. 5 is a timing chart showing an operation of a cutting mechanism according to another embodiment.
FIG. 6 is a schematic configuration diagram showing a labeling device equipped with a conventional cutting mechanism.
FIG. 7 is an explanatory diagram for explaining a state in which a cutting blade enters the tubular film when the tubular film is cut by the cutting mechanism.
[Explanation of symbols]
Reference Signs List 1 labeling device 10 mandrel 11 upper roller 12 lower roller 13 circumferential groove 20 film feeding means 21 feeding roller 30 cutting mechanism 31 base member 32 first rotating body 32a first gear 32b long hole 33 second rotating body 34 cutting blade 34a Rotating shaft 35 Second gear 36 Drive motor 37 Coil spring 38 Brake motor 39 Stopper 40 Label sending means 41 Sending roller CF Cylindrical film L Shrink label B Container

Claims (2)

In the tubular film cutting mechanism that cuts the tubular film by allowing the cutting blade that rotates and moves outside the opened tubular film to enter the tubular film,
A cutting mechanism for a tubular film, wherein a cutting portion of the cutting blade with respect to the tubular film is changed in a cutting process after the cutting blade enters the tubular film. A cutting blade supported rotatably on the outside of the open tubular film,
Rotation driving means for rotating the cutting blade,
An advance / retreat driving unit that advances / retreats the cutting blade between an entry position for entering the tubular film and a retracted position separated from the tubular film,
In the cutting mechanism of the tubular film, which is configured to cut the tubular film, by causing the cutting blade to enter the entry position while rotating and moving,
A tubular film cutting mechanism, wherein a rotation center of the cutting blade is arranged to be eccentric from a center of the tubular film.

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