JP2008161949A - Film cutting device, film cutting method and film roll body manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film cutting device capable of cutting a film in any position linearly and sharply for a long period and a film roll body manufacturing method capable of manufacturing a film roll as a beautiful cylindrical body with good appearance. <P>SOLUTION: The device for cutting carried film is provided with (A) a circular cutting blade, (B) a pair of rollers having suction ports on the outer peripheral faces and suction paths communicated with the suction ports in the inner parts, and (C) a film widthwise moving means for moving a casing supporting the circular cutting blade and the pair of rollers to the film width direction; and (D) the pair of rollers are constituted so that an angle θ between a perpendicular from the center of a projection circle projected from the rotation axis direction of the roller toward an intersection line between the plane and a virtual film carrying path and a line segment which connects the center of the projection circle with a point positioned on the outer peripheral face of the projection circle and intersecting with the cutting edge of the circular cutting blade when the circular cutting blade is projected on the plane is set to be -0.17 rad < θ < 0.17 rad. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a film cutting device, a film cutting method, and a film roll body manufacturing method.

  Conventionally, when winding a plastic film as a film roll body, the edges of the film are trimmed, or the film is slit into a predetermined width and divided into a number of films. The film is cut by.

  For example, Patent Document 1 discloses a technique for cutting a film while providing a suction port on the surface of the lower blade roller to prevent the film from meandering when the film is shear-cut like scissors between the upper blade and the lower blade roller. Has been.

  However, when a thin film is cut by shear cutting as in Patent Document 1, a problem occurs in that the cut ends become wrinkled and the cut end is disturbed. Moreover, in this technique, since the lower blade roller extends over the entire width of the film and there is a blade between the segments having the suction port, it is impossible to achieve both stabilization of the film by suction and free setting of the cutting position of the film. Have serious problems. Further, since the suction port is provided over the entire width of the lower blade roller, it causes a problem such as scratches on the entire width of the film, and it is necessary to wind the film around the lower blade roller to some extent.

 Patent Document 2 discloses a method in which a film is expanded by an expansion roller, then niped over the entire width of the film, and then cut in order to stabilize the tension in the width direction at the cutting point. However, even if the expansion is performed over the entire width, the cutting point is not always stable when viewed locally. The curving roller in Patent Document 2 is the one that most strongly expands the central portion in the width direction of the film. However, when the cutting point is the end portion in the width direction of the film, the wrinkles at the cutting point cannot be completely removed and the cutting is stable. Can not do. In addition, when a thin film is nipped during conveyance, there is also a problem that the film breaks.

  As a cutting device having a roller and a cutting means in a casing movable in the width direction, there is a sheet body cutting device disclosed in Patent Document 3. In this apparatus, a blade is disposed between the rollers, and the film is brought into close contact with the rollers by suction from a gap between the rollers and the casing, so that the cutting is stabilized.

  However, in such a means, the air flow between the rollers is intense, and the film at the cutting point flutters, resulting in disorder of the film cut. Moreover, in order to implement | achieve the support method of the blade illustrated by patent document 3, the components structure which is not specified will be needed and an apparatus will be enlarged.

  Conventionally, it is known that a circular blade is rotationally driven for stable cutting. This is to avoid cutting failure due to rotation or avoid cutting error due to rotation failure. As a cutting method for rotationally driving a circular blade, there are a film cutting device of Patent Document 4 and a slit device of Patent Document 5. When the rotational drive means and the blade are concentrically connected as in Patent Document 4, the drive transmission device is simplified. However, in order to keep the cut surface of the film good, the requirement to reduce the blade and shorten the contact distance between the blade and the film and the requirement to prevent seizure by enlarging the motor to some extent are not compatible. On the other hand, Patent Document 5 uses a belt and a pulley to transmit the drive to decenter the motor and blade, and can use a small blade while using a large motor with little seizure, but the belt has a problem of dust, It is not preferable as a film cutting apparatus that dislikes the above. In addition, the belt drive mechanism becomes large.

  As described above, conventionally, it has been difficult to stably cut a film with a good cut edge at any position without generation of dust and the like.

Examples of non-contact drive transmission means in the present invention to be described later are described in Patent Documents 6 to 7.
JP 2000-127082 A JP-A-60-252559 JP-A-11-33987 JP 2004-50307 A JP 2000-343492 A Japanese Patent No. 3466005 Japanese Patent Laid-Open No. 9-257116

  An object of the present invention is a small film cutting apparatus capable of cutting a film at an arbitrary position in the width direction, having no cutting failure due to wrinkles, etc., having a small amount of dust and having a long life and a small failure, and a method for cutting such a film Is to provide.

  Moreover, the 2nd objective of this invention is providing the manufacturing method of the film roll body which manufactures a high quality film roll body by using the said film cutting device.

  In order to achieve the above object, according to the present invention, there is provided a cutting device for a film being transported, comprising: (a) a circular blade rotatably supported; and (b) the circular shape so as not to contact the circular blade. At least a pair of rollers that are rotatably supported at predetermined intervals on both sides of the blade, have a suction port on the outer peripheral surface, and have a suction path communicating with the suction port inside; (c) the circular blade; Film width direction moving means for moving the casing supporting the at least one pair of rollers in the width direction of the film, and (d) the at least one pair with respect to a plane perpendicular to the axial direction including the cutting edge of the circular blade. A perpendicular line drawn from the center of a projected circle formed by projecting the roller from at least one of the rotation axis directions of the roller to the intersection of the plane and the virtual film transport path; and the projected circle An angle θ between a center and a point on the outer circumference of the projection circle and a line segment connecting points close to the film conveyance path among points intersecting with the blade edge when the circular blade is projected onto the plane is There is provided a film cutting apparatus characterized by satisfying −0.17 rad <θ <0.17 rad.

  Further, according to another aspect of the present invention, there is provided a cutting device for a film being transported, comprising: (a) a circular blade that is rotatably supported; and (b) the circular blade that is not in contact with the circular blade. At least a pair of rollers that are rotatably supported at predetermined intervals on both sides, have suction ports on the outer peripheral surface, and have suction paths communicating with the suction ports inside; (c) the circular blade and the at least A film width direction moving means for moving a casing supporting the pair of rollers in the width direction of the film, and (d) each of the at least a pair of rollers when a negative pressure is applied to the suction path. A film cutting device is provided in which the cutting edge of the circular blade is configured to cut the film in the middle of the portion of the film sucked to the outer peripheral surface.

  According to a preferred aspect of the present invention, there is provided a film cutting apparatus comprising a suction unit that applies a negative pressure to the suction path of the at least one pair of rollers.

  Moreover, according to the preferable form of this invention, it has a suction port in an outer peripheral surface, About the plane perpendicular | vertical to the axial direction of the said circular blade including the blade edge | tip of the said circular blade upstream from the said circular blade seeing from a film conveyance direction. Symmetrically, there is provided a film cutting device comprising at least a pair of inclined rollers arranged so that the rotation direction of the roller surface in contact with the film is widened toward the end.

  Moreover, according to the preferable form of this invention, it has a suction opening in an outer peripheral surface, it is located downstream of the said circular blade seeing from the said film conveyance direction, and was offset by the said film width direction with respect to the said circular blade. There is provided a film cutting device comprising at least one inclined roller.

  According to a preferred embodiment of the present invention, there is provided a film cutting apparatus comprising a rotation support portion for the circular blade on the same side as the at least one pair of rollers with respect to the virtual film transport path. .

  According to still another preferable aspect of the present invention, when the rotation support portion that supports the circular blade is projected onto the plane, the support portion is outside the projection circle, and the at least one pair of rollers is a piece. There is provided a film cutting device characterized by being held and supported.

  According to a preferred embodiment of the present invention, (a) a rotational drive means for rotationally driving the circular blade, and (b) a non-contact drive transmission means for transmitting a driving force of the rotational drive means to the circular blade. A film cutting apparatus is provided.

  According to another aspect of the present invention, the film is disposed on at least a pair of rollers that are movable in the film width direction, are negatively applied to the outer peripheral surface, and are rotatably supported at a predetermined interval in the rotation axis direction. The at least one pair of rollers is movable in the film width direction in synchronism with the at least one pair of rollers in the vicinity of the middle of the portion of the film sucked on the outer peripheral surface of each of the at least one pair of rollers. A film cutting method of cutting the film while rotating a non-contacting circular blade, wherein the middle vicinity means at least one of the at least one pair of rollers with respect to a plane perpendicular to the axial direction including the cutting edge of the circular blade One of the rollers is projected from the center of the projected circle formed by projecting the roller from the direction of the rotation axis of the roller and the film conveyance path. The angle θ formed by the perpendicular line drawn to the line of intersection with the line segment connecting the center of the projected circle and the point where the blade edge of the circular blade cuts the film satisfies −10 ° <θ <10 °. There is provided a method for cutting a film, characterized by cutting the film.

  According to a preferred aspect of the present invention, there is provided a film cutting method characterized in that the at least one pair of rollers and the circular blade are those having a central axis of rotation located on the same side as viewed from the film. .

  According to a preferred embodiment of the present invention, the roller has a suction port on the outer peripheral surface, and is in contact with the film symmetrically with respect to a plane including the blade edge of the circular blade upstream of the circular blade as viewed from the film conveying direction. A film cutting method is provided in which the film before cutting is widened by at least a pair of inclined rollers arranged so that the rotation direction of the surface is widened toward the end.

  According to another aspect of the present invention, there is provided a method for producing a film roll body, wherein the film is cut into a predetermined width and wound using the film cutting device.

  In the present invention, “film” refers to a plastic such as a polyethylene terephthalate film, a polyethylene naphthalate film, a polypropylene film, a polystyrene film, a polycarbonate film, a polyimide film, a polyphenylene sulfide film, a nylon film, an aramid film, a polyethylene film, and an acrylic film. Say film. The present invention is also suitable for other webs such as fabric and paper.

  In the present invention, “intermediate” refers to a position in the width direction sandwiched between a pair of rollers having suction ports on the surface.

  Further, in the present invention, the “circular blade” means that the outer periphery is circular as viewed from the axial direction and the outer edge portion is processed so sharply as to cut a film or the like as viewed from the width direction. These have a single-edged shape in which the cutting edge is formed only on one side and a double-edged shape, and both can be used.

  In the present invention, the “outer peripheral surface” refers to a surface where the roller contacts the film or a surface assuming contact.

  In the present invention, the “suction port” refers to an opening through which gas can flow. Further, the “suction path” refers to a path through which gas can flow from one end having a pressure difference toward the other end. In the present invention, these are communicated to realize a negative pressure at the suction port provided at one end of the suction path by generating a negative pressure at the other end of the suction path. Preferably, a suction means described later is used to apply a negative pressure to the other end.

  In the present invention, the “suction means” refers to a device that transfers air by power and forms a negative pressure at a predetermined site. For example, a vacuum pump or a blower can be used.

  In the present invention, the “casing” refers to a component that supports the roller and the blade.

  In the present invention, the “means for moving the casing in the film width direction” means an apparatus that can move the casing in the film width direction. For example, it is preferable to use a means such as a ball screw or a linear bearing, or a simple combination such as a hole and a shaft engaged therewith.

  Further, in the present invention, “virtual film transport path” refers to suction on the outer peripheral surface of a film cutting device that is rotatably supported at predetermined intervals on both sides of the circular blade so as not to contact the circular blade. A path through which a film is conveyed when there is no at least a pair of rollers having a mouth and a suction path communicating with the suction port. For example, it is a virtual film transport path 5 as shown in FIG.

  In the present invention, the term “inclined roller” refers to a roller having a rotation vector having a finite angle with respect to the rotation vectors of the circular blade and the rollers on both sides of the circular blade.

  Further, in the present invention, “at least one inclined roller offset with respect to the circular blade” is shifted in the film width direction with respect to the blade and opposite to the upstream inclined roller on the same side as viewed from the circular blade. It means a roller inclined in the direction.

  In the present invention, the “rotation driving means for rotating the circular blade” may be a rotational power source such as an electric motor, an air motor, a hydraulic motor, or a windmill.

  In the present invention, “non-contact drive transmission means” refers to means for transmitting rotational driving force without direct contact. For example, it is preferable to use a magnetic pulley that transmits torque by the repulsive force of magnetic force.

  ADVANTAGE OF THE INVENTION According to this invention, the film cutting apparatus which can cut | disconnect a film linearly and sharply over a long period of time in the arbitrary positions of a film width direction can be obtained. In addition, by using the cutting device, a film having a beautiful cut surface is obtained, and when this is wound up as a film roll body, the film roll body can be manufactured as a beautiful cylindrical body having an excellent appearance. You can get the method. This film roll body is also characterized by few scratches on the surface in the width direction.

  Hereinafter, an example in which the embodiment of the present invention is applied to a plastic film winding process will be described as an example with reference to the drawings.

  FIG. 1 is a schematic sectional view of a film cutting apparatus according to an embodiment of the present invention, and FIG. 2 is an example of a schematic plan view thereof.

  In FIG. 1, a roller 1 is composed of two rollers, a roller 1 a and a roller 1 b, and is paired with a circular blade 2 interposed therebetween. FIG. 2 shows a top view of this. The pair of rollers 1a and 1b are positioned at a certain interval in the width direction of the film 3, and the cutting edge of the circular blade 2 is positioned between the gaps. The roller 1 has a suction port 14 on both sides of the roller 1a and the roller 1b. The suction port 14 communicates with the suction path 16 and is connected to the suction means 9 via the suction connection port 11 and the hose 12. Negative pressure is applied. The roller 1 and the circular blade 2 are rotatably supported by the housing 7. The circular blade 2 is driven by the rotation driving means 6 through the drive transmission means. Here, the drive transmission means is preferably non-contact drive transmission means 51, 52 as shown in FIG. The rotation driving means 6 is fixed to the casing by means such as screws or adhesion. The non-contact drive transmission means 51 and 52 may be arranged in parallel or may transmit the rotational torque in the vertical direction. Moreover, the thing which transmits torque with the angle between them may be used. Here, as shown in FIG. 1, a device that transmits the drive torque at a right angle is used. Thereby, the apparatus can be made compact.

  As can be seen from FIG. 1, when observed from the axial direction of the circular blade 2, the blade edge of the circular blade 2 is positioned near the portion where the roller 1 and the film 3 are in contact with each other. FIG. 8 shows this in detail. FIG. 8 shows the conveyance path of the roller 1, the circular blade 2, and the film 3 projected onto a plane perpendicular to the axial direction of the circular blade 2. At this time, a perpendicular line drawn from the center of the projected circle of the roller 1 to the intersection with the virtual transport path of the film 3, and the circumference of the projected circle and the circumference of the circular blade 2 from the center of the projected circle The angle formed by the line segment drawn at the intersection is θ. In FIG. 8, the film 3 is preferably cut at the intersection of the roller 1 and the film 3, but since the actual film is slightly wound around the roller 1 by suction, θ has a range, preferably −0.17 rad <θ <0.17 rad.

  Thereby, the film 3 adheres to the surface of the roller 1 and is stably cut.

  Further, in the present embodiment, the suction port 14 is only the outer peripheral surface of the roller, and therefore no excessive air flow is generated between the roller 1 and the casing or between the roller 1 and the circular blade 2. Further, the film 3 adsorbed on the outer peripheral surface of the roller 1 by suction is not pushed into the groove by the blade and does not float on the contrary.

  The casing 7 is supported by the width direction moving means 8, and the width direction moving means 8 is supported by a frame or the like. This is because the width of the casing is smaller than the film width, and the position of the film cutting apparatus can be changed in the width direction, so that the cutting position of the film can be freely changed. That is, the film cutting device of this embodiment is a unit device that abuts a part in the film width direction. This is because there are a suction roller and an inclined roller only in the vicinity of the film cutting portion, so that the roller group 1 comes into contact with the film 3 with almost no winding around the film 3. A preferable range of the winding angle is about ± 0.26 rad. Thereby, the film can be cut without changing the pass line of the film. In addition, this configuration makes it possible to achieve both stable cutting of the film 3 by adsorption to the roller 1 and enabling cutting at an arbitrary position.

  It is preferable that the rotation direction of the rotation driving means 6 can be reversed. Moreover, what can adjust a rotational speed suitably is preferable. Thereby, the direction and speed of a rotary blade can be changed, and the film 3 can be cut | disconnected on the conditions with the best sharpness. More preferably, the circular blade is rotated in the direction as shown in FIG. Thereby, the relative speed between the cross section of the film 3 after cutting and the circular blade is reduced, and unnecessary rubbing of the cut surface can be prevented.

  Moreover, it is preferable to have the rotation support part of the circular blade 2 in the same surface side as a pair of roller 1 with respect to a film conveyance path | route. In order to realize this, preferably, when the rotation support portions of the roller 1 and the circular blade 2 are projected on a plane perpendicular to the axial direction of the circular blade 1, the rotation support portion of the circular blade 2 becomes the roller 1. The pair of rollers 1 are preferably cantilevered at the same time. With these configurations, the circular blade 2 and the roller 1 can move integrally in the width direction, the film cutting position can be easily adjusted, and the relative position between the circular blade 2 and the roller 1 is once. Since it does not change once determined, a sharp state can be maintained for a long time.

  FIG. 3 is a schematic plan view of a film cutting apparatus according to another embodiment of the present invention. In addition to the configuration of FIG. 2, a pair of inclined rollers 4 is disposed upstream of the roller 1. Like the roller 1, the inclined roller 4 has a suction port 14 on the surface, and a negative pressure is applied by the suction means 9. In addition, the inclined roller 4 is rotatably supported by the housing 7 like the roller 1. As can be seen from FIG. 3, the inclined rollers 14 are arranged symmetrically with the circular blade 2 in between, and the wrinkles of the film 3 are locally removed immediately before the upstream of the circular blade 2 to enable cutting while stretching. At this time, the inclined roller 4 is inclined in a plane parallel to the film, and is inclined so that the cosine component of the roller rotation direction vector is the axial direction of the roller 4. When the inclination angle is preferably 0.05 rad to 0.8 rad from the axial direction of the roller 4, a widening effect can be obtained, and more preferably 0.17 rad to 0.34 rad, because widening can be achieved while avoiding scratches. Further, the inclined roller is a means capable of expanding the film with almost no winding of the film.

  FIG. 4 is a schematic sectional view showing a method of supporting the roller 1 and the inclined roller 4 and a suction path. The suction port 14 of the roller 1 communicates with the suction path 16 of the shaft 13 of the roller 1 and is connected to the suction connection port 11 through a suction path formed inside the housing 7. The housing does not necessarily have a suction path, and the suction connection port 11 may be provided directly in the suction path 16 of the roller. Further, the suction path shown in FIG. 3 is not necessarily processed at a time, and may be formed by plugging the end of the hole after processing the through hole. Here, the suction connection port 11 is a part or component connected to the hose 12. The roller 1 and the inclined roller 4 are rotatably supported by a bearing 10. The bearing 10 is engaged and supported by a shaft 13. The shaft 13 is supported by the housing 7. Here, the roller 1 and the inclined roller 3 do not necessarily have the shaft 13, and the shaft 13 may be integrally manufactured, and may be rotated and supported by the bearing 10, and the bearing 10 may be supported by the housing 7.

  Also, in order to efficiently attract the film to the roller 1 even with a small winding angle, the suction path 16 is not opened all around as shown in FIG. 4 but only within the range where the film is to be wound. It is preferable that the opening is made in the range of the above-described winding angle ± 0.26 rad.

  FIG. 5 is a schematic cross-sectional view showing a method for supporting the circular blade 2. The circular blade 2 is supported by a shaft 16, the shaft 16 is rotationally supported by a bearing 19, and the bearing 19 is engaged and supported by the housing 7. The circular blade 2 and the shaft 16 may be fixed by friction between the nut 17 and the shaft 16 as shown in the figure, or fixed by a key provided between the shaft 16 and the circular blade 2 to transmit the driving force. May be. A tactile drive transmission means, preferably a non-contact drive transmission means 51 is fixed to a part of the shaft 16 by means such as a set screw, an O-ring or a key. The circular blade 2 may be cantilevered by the shaft 16, but preferably it is both supported by further connecting the shaft 18 as shown in FIG. 5. Further, in the figure, the shaft 18 also plays the role of a double nut, and preferably plays a role of preventing loosening of the screw. As with the shaft 16, the shaft 18 is rotatably supported by a bearing 19. Further, the casing 7 may be partially divided so that the circular blade 2 can be removed and replaced. The divided casing 7 is fixed by fitting or screws.

  In addition, a guide roller 15 may be appropriately disposed upstream of the inclined roller 4 as shown in FIG. Thereby, it is possible to prevent the film 3 from being damaged or torn at the corners of the casing 7 and the widening roller 4.

  FIG. 6 shows an example of the case where the film cutting apparatus of one embodiment of the present invention is used as a method for producing a film roll body. The film 3 is discharged as a film roll body 31 by discharging the melted polymer from the base 20 and solidifying it on the drum 21, and then transported by the guide roll 22 or the like. In FIG. 6, the base 20 is fixedly supported on a frame or the like. The guide roll 22, the winding core 23, and the like are rotatably supported by bearings and are driven to rotate by a motor or the like. The bearing is appropriately supported by a frame or the like. In addition, an apparatus for stretching the film 3, a corona treatment apparatus, a thickness measuring instrument, and the like are appropriately disposed on the downstream side of the drum 21. In FIG. 6, in order to trim both ends of the film 3, a pair of film cutting devices according to an embodiment of the present invention are arranged at positions before winding. The film cutting device can be installed at an arbitrary position in the width direction as appropriate by the width direction moving means 8 or manually by a driving device such as a motor, and is preferably fixed with a stopper or the like when the position is determined. The width direction moving means 8 in FIG. 6 is a combination of a hole and a shaft, and the housing moves in the width direction of the film 3 by sliding the shaft and the hole. In this case, the shaft is supported by a frame or the like, thereby supporting the weight of the casing of the film cutting apparatus. Although omitted in FIG. 6, when an electric motor is used for the rotation driving means 6, a rotation or torque control device and a power source are connected. The trimmed film 32 is appropriately collected, and the cut film 3 is wound on the core 23 as a film roll 31.

  FIG. 7 shows a more preferable embodiment of the film cutting device according to one embodiment of the present invention. When the film cutting apparatus shown in FIG. 3 is installed as shown in FIG. 6, even if the cutting point is extended cleanly by the inclined roller 4, wrinkles created by the inclined roller 4 inside the cutting point may remain after cutting. is there. In order to remove this, it is preferable to place the inclined roller 24 on the downstream side of the circular blade 2 as shown in FIG. At this time, the inclined roller 24 is arranged on the end side of the film 3. Therefore, in the situation shown in FIG. 6, the inclined roller 24 in FIG. 7 is symmetrical in the left and right cases.

  Further, the roller 1 may be arranged on the downstream side of the circular blade 2 as shown in FIG. Thereby, it is possible to prevent the film 3 from being lifted by the rotation of the circular blade 2, and the film 3 is stabilized when the rotation direction of the circular blade 2 is reversed.

  The material of the circular blade 2 is not particularly selected, but for example, carbon steel, stainless steel, fine ceramic, etc. can be used. Further, a material obtained by quenching high carbon steel or a material that has been subjected to nitriding treatment, diamond-like carbon coating, or the like to improve wear resistance is preferable.

  In general, the roller 1, the inclined roller 4, and the inclined roller 24 are preferably made of resin and metal. The surface may be rubber-lined. In the case of a metal, steel or the like is used, but considering the generation of rust, stainless steel, plated one, or non-ferrous metal such as aluminum alloy is preferable. The same applies to the housing 7. Since the housing 7 may come into contact with the film 3, it is preferable to chamfer the corners. Further, it is preferable that the suction port on the surface of the roller 1 and the corners of the surface of the roller 1 are all chamfered.

  Further, when the film 3 is charged by the film cutting device, it is preferable to remove the charge by appropriately disposing a static eliminator downstream of the device.

[Example 1]
An example of one embodiment of the present invention will be described in detail with reference to the drawings. The film cutting apparatus of FIG.1 and FIG.2 was used for the manufacturing method of a film roll body. The film is a biaxially stretched polypropylene film (Torayfan (registered trademark), manufactured by Toray) having a thickness of 4 μm and a width of 3 m. This is cut into a width of 2.5 m and wound up as a film roll body 31. The film winding speed is 350 m / min.

  The roller 1 of FIG. 1 is made of stainless steel except for the bearing, and a deep groove ball bearing made of steel and made by NTN was used as the bearing. The outer diameter of the roller 1 is 30 mm, and the width is 40 mm. The circular blade 2 shown in FIG. 1 was a double-edged shape made of carbon steel having a diameter of 60 mm and a width of 0.3 mm. The bearing is similar to the roller 1. The gap of the roller 1 into which the circular blade 2 is inserted was 1 mm. The width of the housing is 140 mm for a film width of 2.5 m, and the length is 100 mm. The suction ports on the surface have an elliptical shape with a long diameter of 6 mm and a short diameter of 2 mm, and are provided so as to be almost evenly arranged at 20 places in the circumferential direction, 5 places in the axial direction, and a total of 100 places per roller.

  Further, Magtran FD type orthogonal type (trade name) manufactured by FC Co., Ltd. was used as the non-contact drive transmission means 51 and 52 for transmitting the rotational drive force to the circular blade 2. An AC non-contact speed control motor (trade name) manufactured by Oriental Motor was used as the rotation driving means 6, and a control device and a distribution board were separately prepared. The casing 7 was made from a machined aluminum alloy. The width direction moving means 8 consisted of a shaft having a diameter of 15 mm and a hole, and was fixed by a set screw.

  As the suction means 9, a vortex blower (trade name) manufactured by Hitachi, Ltd. was used. Part of the hose has a separate intake damper. The suction pressure was 3 kPa.

  Further, in this embodiment, θ in FIG. 8 is arranged so that θ = 0 rad by setting the distance between the axial centers of the circular blade 2 and the roller 1 to x = 23.8 mm and y = 3.2 mm, respectively. .

As the evaluation method, film cut surface observation with a microscope and film breakage occurrence time due to film cutting error were adopted. Film tearing occurs when wrinkles enter the cut point or the film flutters. Moreover, in order to confirm whether a film cutting position can be set arbitrarily, the error with respect to the target cutting width of 2.5 m was measured.
[Example 2]
A detailed description will be given based on drawings of another example of one embodiment of the present invention. The film cutting apparatus of FIG. 7 was used for the manufacturing method of a film roll body. The film is the same as in Example 1. The roller 1, the inclined roller 4, and the inclined roller 24 of FIG. 7 are of the same material, support method, and dimensions as the roller 1 of the first embodiment. The axial direction of the tilting roller 4 and the tilting roller 24 was tilted by 0.3 rad with respect to the axial direction of the roller 1. The same circular blade, suction means, drive transmission means, and rotation drive means as those in Example 1 were used. The width | variety of the housing | casing 7 is the same as Example 1, and length is 200 mm.

The positional relationship between the circular blade 2 and the roller 1 is the same as that in the first embodiment.
[Comparative Example 1]
The cutting evaluation of the film similar to the example was carried out by a shear cut type cutting means using a receiving blade roller having a suction port manufactured based on Patent Document 1. Unlike the embodiment, this receiving blade roller is integrated on both sides of the blade. Moreover, the receiving blade roller exists in the entire width of the film 1 and does not have a width direction moving means. Further, since the film is wound by 3 rads around the receiving blade roller, θ in FIG. 8 cannot be defined. The receiving roller is subjected to hard chrome plating, and the width of each divided roller is 30 mm. The suction means was the same as in the example. The slit blade was made of cemented carbide and the thickness was 1 mm. The diameter of the suction port is 1 mm. The receiving blade roller has a diameter of 250 mm and a surface length of 3.5 m.

  The present invention can be applied not only to a film device but also to a thin web having a thin width such as a cloth or paper cutting device, but the application range is not limited thereto.

1 is a schematic cross-sectional view of a film cutting device according to an embodiment of the present invention. It is a schematic plan view of the film cutting device concerning one Embodiment of this invention. It is a schematic plan view of the film cutting device concerning another embodiment of this invention. It is a fragmentary sectional view of the film cutting device concerning one Embodiment of this invention. It is a fragmentary sectional view of the film cutting device concerning one Embodiment of this invention. It is a schematic perspective view of the manufacturing method of the film roll body concerning one Embodiment of this invention. It is a schematic plan view of the film cutting device concerning another embodiment of this invention. It is the projection figure which showed the positional relationship of the circular blade of this invention, a roller, and a film.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 A pair of rollers 1a One roller of a pair of rollers 1b The other roller of a pair of rollers 2 Circular blade 3 Film 5 Virtual film conveyance path 6 Rotation drive means 7 Case 8 Width direction movement means 9 Suction means 10 Bearing 11 Suction connection port 12 Hose 13 Shaft 14 Suction port 15 Guide roller 16 Suction route 17 Nut 18 Shaft 19 Bearing 20 Base 21 Drum 22 Guide roller 23 Core 31 Film roll body 32 Film edge 51 Non-contact drive transmission means 52 Non-contact drive transmission means
61 Film conveyance direction 62 Circular blade rotation direction x Distance between the horizontal axis of the circular blade and the roller y Distance between the vertical axis of the circular blade and the roller

Claims (12)

A cutting device for a film being transported, comprising: (a) a circular blade that is rotatably supported; and (b) a circular blade that is rotatably supported at predetermined intervals on both sides of the circular blade so as not to contact the circular blade. Further, at least a pair of rollers having a suction port on the outer peripheral surface and having a suction path communicating with the suction port inside, and (c) a casing that supports the circular blade and the at least one pair of rollers, (D) rotating at least one of the at least one pair of rollers with respect to a plane perpendicular to the axial direction including the cutting edge of the circular blade. A perpendicular line drawn from the center of the projected circle projected from the axial direction to the intersection of the plane and the virtual film transport path, the center of the projected circle, and a point on the outer circumference of the projected circle. An angle θ formed by a line segment connecting points close to the film conveyance path among points intersecting with the blade edge when the circular blade is projected onto the plane is −0.17 rad <θ <0.17 rad. A film cutting apparatus. A cutting device for a film being transported, comprising: (a) a circular blade that is rotatably supported; and (b) a circular blade that is rotatably supported at predetermined intervals on both sides of the circular blade so as not to contact the circular blade. Further, at least a pair of rollers having a suction port on the outer peripheral surface and having a suction path communicating with the suction port inside, and (c) a casing that supports the circular blade and the at least one pair of rollers, And (d) a portion of the film that is sucked to the outer peripheral surface of each of the at least one pair of rollers when a negative pressure is applied to the suction path. A film cutting apparatus characterized in that the blade edge of the circular blade is configured to cut the film in the middle. The film cutting apparatus according to claim 1, further comprising a suction unit that applies a negative pressure to the suction path of the at least one pair of rollers. Rotation of the roller surface in contact with the film, having a suction port on the outer peripheral surface, symmetrically with respect to a plane perpendicular to the axial direction of the circular blade including the cutting edge of the circular blade upstream of the circular blade as viewed from the film conveying direction The film cutting device according to any one of claims 1 to 3, further comprising at least a pair of inclined rollers arranged in a direction in which the direction is widened toward the end. It has a suction port on the outer peripheral surface, and is provided with at least one inclined roller positioned downstream of the circular blade as viewed from the film conveying direction and offset in the film width direction with respect to the circular blade. The film cutting device according to any one of claims 1 to 4. 6. The film cutting device according to claim 1, further comprising a rotation support portion of the circular blade on the same side as the at least one pair of rollers with respect to the virtual film conveyance path. When the rotary support portion that supports the circular blade is projected onto the plane, the support portion is outside the projection circle, and the at least one pair of rollers is cantilevered. The film cutting device according to any one of claims 1 to 6. 8. (a) A rotary drive means for rotationally driving the circular blade, and (b) a non-contact drive transmission means for transmitting a driving force of the rotary drive means to the circular blade. The film cutting device according to any one of the above. The film is sucked onto at least a pair of rollers that are movable in the film width direction, negative pressure is applied to the outer peripheral surface, and is rotatably supported at a predetermined interval in the rotation axis direction. The film is cut while rotating a circular blade that is movable in the film width direction in synchronization with the at least one pair of rollers and does not contact the at least one pair of rollers in the vicinity of the middle of the film portion sucked on the outer peripheral surface. In the method of cutting a film, the vicinity of the intermediate means that at least one of the at least one pair of rollers is a rotation axis of the roller with respect to a plane perpendicular to the axial direction including the cutting edge of the circular blade A perpendicular drawn from the center of the projected circle made by projecting from the direction to the intersection of the plane and the film transport path, and A film characterized in that the film is cut such that an angle θ formed between a center of a shadow circle and a line segment connecting the film to a point where the blade edge of the circular blade cuts is −10 ° <θ <10 ° Cutting method. The film cutting method according to claim 9, wherein the at least one pair of rollers and the circular blade are ones having a central axis of rotation on the same side as viewed from the film. A suction port is provided on the outer peripheral surface, and at the upstream of the circular blade as viewed from the film conveying direction, the rotational direction of the roller surface in contact with the film is arranged in a divergent manner symmetrically with respect to a plane including the cutting edge of the circular blade. The film cutting method according to claim 9 or 10, wherein the film before cutting is expanded by a pair of inclined rollers. A method for producing a film roll, comprising using the film cutting device according to claim 1 to cut the film into a predetermined width and winding the film.

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