Paper tube cutting device

Abstract

To provide a paper tube cutting device capable of appropriately cutting a paper tube while suppressing damage to rotary blades and chuck claws.SOLUTION: Since a main spindle-side rotary blade 2 and a follower-side rotary blade 3 cut toward grooves 73, 83a, 83b when cutting a paper tube 100, in a case where each rotary blade 2, 3 cuts into the inner circumferential side of the paper tube 100, the cutting edges of each rotary blade 2, 3 can be received inside the grooves 73, 83a, 83b. Accordingly, contact between each rotary blade 2, 3 and chuck claws 70, 80 can be prevented, thereby suppressing damage to each rotary blade 2, 3 and chucks 7, 8. In addition, since the paper tube 100 is cut by cutting of each rotary blade 2, 3 toward the grooves 73, 83a, 83b of the chuck claws 70, 80, the paper tube 100 after separation is not separated from the chuck claws 70, 80. Therefore, even immediately before being cut by each rotary blade 2, 3, since the paper tube 100 can be stably rotated, the paper tube 100 can be appropriately cut.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a paper tube cutting device, and more particularly to a paper tube cutting device capable of appropriately cutting a paper tube while suppressing damage to a rotary blade and a chuck.

Background Art

[0002] For example, Patent Document 1 describes a technique of using a paper pipe 1 (paper tube) as a tube for filling gunpowder for a hand-held firework. According to this technique, unlike the case of manufacturing a hand-held firework by filling gunpowder into bamboo, operations such as degreasing and knotting of bamboo can be omitted, so the manufacturing process of the hand-held firework can be simplified. In addition, when launching a hand-held firework, an explosion due to the breakage of bamboo can be prevented, so the safety can be improved.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There are various types of hand-held fireworks, such as a relatively short hand-held tube (so-called yokan) held with one hand and a tube held with both hands. Therefore, it is necessary to cut the paper tube to a length corresponding to the type of hand-held firework, but conventionally, the paper tube has been cut manually. Therefore, a technique for easily cutting a paper tube for a hand-held firework is required.

[0005] Therefore, the applicant of the present application conceived of an apparatus that grips and rotates the inner peripheral surfaces of both ends in the longitudinal direction of a paper tube with chuck jaws and cuts the paper tube by pressing a rotary blade against the rotating paper tube (not known at the time of filing of the present application). However, in the case of such a cutting apparatus, if the paper tube is cut in the area gripped by the chuck jaws, the rotary blade that has cut into the inner peripheral side of the paper tube contacts the chuck jaws, and the rotary blade and the chuck jaws are likely to be damaged.

[0006] On the other hand, if cutting is performed on the central side in the longitudinal direction of the paper tube rather than the gripping portion of the chuck jaws, the cut paper tube is separated from the chuck jaws, so the rotation of the paper tube becomes unstable near the end of cutting. Therefore, the paper tube cannot be cut appropriately.

[0007] The present invention has been made to solve these problems, and an object thereof is to provide a paper tube cutting apparatus that can appropriately cut a paper tube while suppressing damage to a rotary blade and chuck jaws.

Means for Solving the Problems

[0008] To achieve this object, the paper tube cutting apparatus of the present invention includes chuck jaws that rotate around the axis of a main shaft and grip the inner peripheral surface of a paper tube, and a first rotary blade that cuts the paper tube rotated by the chuck jaws. A groove extending in the direction around the axis is formed on the outer peripheral surface of the chuck jaws, and the first rotary blade cuts toward the groove when cutting the paper tube.

Effects of the Invention

[0009] According to the paper tube cutting device described in claim 1, a groove extending in the direction around the axis is formed on the outer peripheral surface of the chuck jaw, and the first rotary blade cuts into the groove when cutting the paper tube. Therefore, when the first rotary blade cuts into the inner peripheral side of the paper tube, the cutting edge of the first rotary blade can be received inside the groove. Thus, it is possible to prevent the first rotary blade from contacting the chuck jaw, and there is an effect that damage to the rotary blade and the chuck jaw can be suppressed. Further, since the paper tube is cut by the cutting of the first rotary blade toward the groove of the chuck jaw, the cut paper tube is not separated from the chuck jaw. Therefore, even at the end of the cutting by the first rotary blade, the paper tube can be stably rotated, and there is an effect that the paper tube can be appropriately cut.

[0010] According to the paper tube cutting device described in claim 2, in addition to the effects achieved by the paper tube cutting device described in claim 1, the following effects are achieved. Since it includes a second rotary blade that cuts the central side of the paper tube in the axial direction relative to the first rotary blade, and support rollers that are arranged on both axial sides sandwiching the second rotary blade and rotatably support the paper tube, the cut paper tube cut by the second rotary blade can be supported by the support rollers. Thereby, even when the central side of the paper tube is cut by the second rotary blade, the rotation of the paper tube can be stabilized, and there is an effect that the paper tube can be appropriately cut.

[0011] According to the paper tube cutting device described in claim 3, in addition to the effects achieved by the paper tube cutting device described in claim 2, the following effects are achieved. Since the first rotary blade is configured to be movable to a first cutting position where the paper tube is cut by cutting into the groove and a second cutting position where the central side of the paper tube in the axial direction relative to the chuck jaw is cut, when the first rotary blade cuts the paper tube at the second cutting position, both ends of the paper tube cut between the first rotary blade and the second rotary blade are separated from the chuck jaw.

[0012] On the other hand, since the paper tube cutting device is arranged above the support roller and is provided with a pressing roller that rotatably presses the upper surface of the paper tube, the paper tube whose both ends are separated from the chuck claws can be clamped from above and below by the support roller and the pressing roller. That is, even when both ends of the paper tube are separated from the chuck claws after cutting, the rotation of the paper tube can be stabilized, so that there is an effect that the paper tube can be appropriately cut.

[0013] According to the paper tube cutting device described in claim 4, in addition to the effect exhibited by the paper tube cutting device described in claim 2, the following effect is exhibited. The second rotary blade cuts the paper tube by being displaced in the horizontal direction, and the support roller includes a side roller that supports the side surface of the paper tube on the side opposite to the second rotary blade, and a lower roller that supports the paper tube from below. Since the rotation axis of the side roller is located at a height that coincides with the axis or above the axis, the force when the second rotary blade cuts into the paper tube (the force with which the second rotary blade pushes the paper tube) can be effectively supported by the side roller. Thereby, since the cutting force of the second rotary blade along the horizontal direction is likely to be applied to the paper tube, the paper tube can be appropriately cut.

[0014] Also, since the rotation axis of the lower roller is located on the second rotary blade side of the axis, the paper tube can be stably supported by the lower roller and the side roller arranged on both sides sandwiching the axis (paper tube). Thereby, since the rotation of the paper tube can be stabilized, there is an effect that the paper tube can be appropriately cut.

[0015] According to the paper tube cutting device described in claim 5, in addition to the effect exhibited by the paper tube cutting device described in claim 2, the following effect is exhibited. A paper tube with a relatively small diameter is defined as a small-diameter tube, and a paper tube with a diameter larger than that of the small-diameter tube is defined as a large-diameter tube. When defined in this way, it is possible to form a support state in which the small-diameter tube is supported by the support roller when cutting the small-diameter tube and a non-support state in which the large-diameter tube is not supported by the support roller when cutting the large-diameter tube. Thereby, even when a support roller for supporting the small-diameter tube is provided, a large-diameter tube having a diameter larger than that of the small-diameter tube can be cut by the same paper tube cutting device. Therefore, there is an effect that the versatility of the paper tube cutting device can be improved.

[0016] According to the paper tube cutting device described in claim 6, in addition to the effects achieved by the paper tube cutting device described in claim 1, the following effects are achieved. On the chuck jaw, a first groove and a second groove are formed side by side in the axial direction. At least one of the chuck jaw and the first rotary blade is configured to be movable to a first position where the first rotary blade cuts into the first groove and a second position where the first rotary blade cuts into the second groove. Therefore, by the cutting of the first rotary blade toward the first groove or the second groove, it becomes possible to cut the ends of paper tubes with different lengths to the same length, or to cut the ends of paper tubes with the same length to different lengths. Thus, there is an effect that the versatility of the paper tube cutting device can be improved.

[0017] According to the paper tube cutting device described in claim 7, in addition to the effects achieved by the paper tube cutting device described in claim 1, the following effects are achieved. A guide extending in a horizontal direction orthogonal to the axial direction, a support body configured to be slidable along the guide and supporting the first rotary blade, a regulating wall disposed on the front side in the sliding direction of the support body, and a regulating member that regulates the slide toward the front side in the sliding direction of the support body by being sandwiched between the regulating wall and the support body. Since the thickness of the regulating member in the sliding direction of the support body is formed to be a thickness corresponding to the inner diameter of the paper tube, even when cutting paper tubes with different inner diameters, the first rotary blade can be slid by a cutting amount corresponding to the inner diameter of the paper tube. Thus, it is possible to suppress the cutting edge of the first rotary blade from contacting the bottom surface of the groove of the chuck jaw, and there is an effect that damage to the first rotary blade and the chuck jaw can be prevented.

[0018] According to the paper tube cutting device described in claim 8, in addition to the effects achieved by the paper tube cutting device described in claim 7, the following effects are achieved. It is provided with first detection means for detecting whether a regulating member is disposed between the support and the regulating wall. When the regulating member is not detected by the first detection means, since cutting of the paper tube becomes impossible, it is possible to suppress the start of cutting of the paper tube by the first rotary blade in a state where the regulating member is not placed between the support and the regulating wall. Therefore, it is possible to suppress the first rotary blade from excessively cutting into the paper tube, and thus it is possible to suppress the cutting edge of the first rotary blade from contacting the bottom surface of the groove of the chuck jaw. Therefore, there is an effect that breakage of the first rotary blade and the chuck jaw can be suppressed.

[0019] According to the paper tube cutting device described in claim 9, in addition to the effects achieved by the paper tube cutting device described in claim 8, the following effects are achieved. It is provided with first detection means capable of detecting the type of the regulating member and second detection means capable of detecting the inner diameter of the paper tube gripped by the chuck jaw. When the thickness of the regulating member detected by the first detection means and the inner diameter of the paper tube detected by the second detection means correspond to each other, cutting of the paper tube is permitted, so that cutting by the first rotary blade can be surely performed with a cutting amount corresponding to the inner diameter of the paper tube. Thereby, it is possible to suppress the cutting edge of the end rotary blade from contacting the bottom surface of the groove of the chuck jaw, and thus there is an effect that breakage of the first rotary blade and the chuck jaw can be suppressed.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0021] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, with reference to FIGS. 1 and 2, the overall configuration of the paper tube cutting device 1 will be described. FIG. 1 is a front perspective view of the paper tube cutting device 1 in the first embodiment, and FIG. 2 is a partially enlarged perspective view of the paper tube cutting device 1 with the II portion in FIG. 1 enlarged. In FIGS. 1 and 2, the arrow directions U-D, F-B, and L-R indicate the vertical direction, the front-rear direction, and the left-right direction of the paper tube cutting device 1, respectively, and the same applies to FIGS. 3 and subsequent figures.

[0022] As shown in FIG. 1, the paper tube cutting device 1 is a device for cutting a cylindrical paper tube 100 with a plurality of rotary blades 2 to 4. In the following description, among the rotary blades 2 to 4, the one that cuts one end (the end on the arrow L side) of the paper tube 100 is referred to as the main shaft side rotary blade 2, the one that cuts the other end (the end on the arrow R side) of the paper tube 100 is referred to as the driven side rotary blade 3, and the one that cuts the central portion of the paper tube 100 between the rotary blades 2 and 3 is referred to as the central rotary blade 4 for description.

[0023] The paper tube 100 is a paper-made cylinder in which a large number of layers of base paper are adhered with an adhesive, and is a hard cylinder that is also used for a film winding core or the like. The paper tube 100 cut by the paper tube cutting device 1 serves as a substitute for bamboo for filling the gunpowder of hand-held fireworks.

[0024] The paper tube cutting device 1 includes a housing 5 (installation table) installed on the installation surface, and a spindle base 6 for rotating the paper tube 100 is supported on the housing 5. The spindle base 6 includes a spindle (not shown) and a spindle motor for applying power to rotate the spindle, etc., and since a known configuration (used for a known lathe, etc.) can be adopted, detailed description is omitted. In the following description, the direction along the axis C of the spindle of the spindle base 6 (the direction of the arrow L-R) will be simply described as the left-right direction.

[0025] A spindle chuck 7 is attached to the spindle end (the end on the arrow R side) of the spindle of the spindle base 6, and a driven chuck 8 is provided at a position facing the spindle chuck 7 in the left-right direction. Each of these chucks 7, 8 is a three-jaw chuck having a plurality (three in this embodiment) of chuck jaws 70, 80 arranged around the axis C.

[0026] The chuck jaw 70 is an L-shaped claw (internal jaw) including a mounting portion 71 (see FIG. 2) extending in a direction perpendicular to the axis C and attached to each chuck 7, and a protruding portion 72 protruding in the left-right direction (toward the driven chuck 8) from the end on the axis C side of the mounting portion 71. The chuck jaw 80 of the driven chuck 8 is also formed in an L-shape with similar mounting portion 81 and protruding portion 82 (both see FIG. 3).

[0027] The chuck jaws 70, 80 are configured to be reciprocally movable in a direction perpendicular to the axis C. Each of the chucks 7, 8 may be a manual scroll chuck that operates the chuck jaws 70, 80 by operating a chuck handle, or a power chuck that operates the chuck jaws 70, 80 by pneumatic or hydraulic pressure.

[0028] The spindle chuck 7 is fixed to the housing 5 so as not to be relatively displaceable, while the driven chuck 8 is configured to be slidable along a rail 9 fixed to the upper surface of the housing 5. The rails 9 are provided in a pair at intervals in the horizontal direction (the direction of the arrow F-B) perpendicular to the axis C (hereinafter simply referred to as the "front-rear direction"), and this pair of rails 9 extends linearly along the left-right direction.

[0029] On each of the pair of rails 9, a pair of blocks 10 are slidably engaged, and the rail 9 and the block 10 constitute a linear guide mechanism. On the upper surfaces of the four blocks 10 provided on the pair of rails 9, a support plate 11 is fixed, and a bearing base 12 protrudes upward from the upper surface of the support plate 11. A driven chuck 8 is rotatably supported by a bearing 13 attached to the bearing base 12, and the rotation axis of the driven chuck 8 around the bearing 13 coincides with the axis C.

[0030] A clamper 14 is fixed to the lower surface of the support plate 11, and the relative position of the block 10 (driven chuck 8) with respect to the rail 9 is fixed by the operation of the clamper 14. Since a known structure for fixing and releasing the block 10 by the clamper 14 can be adopted, a detailed description is omitted. By operating the clamper 14 to rotate, a brake shoe provided on the clamper 14 is brought into contact with or separated from the rail 9.

[0031] When supporting the paper tube 100 on each of the chucks 7 and 8, first, with the driven chuck 8 retracted (slid in the direction of arrow R) along the rail 9 with respect to the spindle chuck 7, the chuck jaws 70 (the protruding portions 72 shown in FIG. 2) of the spindle chuck 7 are inserted into the inner peripheral surface of one end side of the paper tube 100. Next, the driven chuck 8 is slid along the rail 9 toward the spindle chuck 7 side, and the chuck jaws 80 (the protruding portions 82) are inserted into the inner peripheral surface of the other end side of the paper tube 100.

[0032] In this state, the relative position of the driven chuck 8 with respect to the rail 9 is positioned by the operation of the clamper 14, and by expanding the diameters of the respective chuck jaws 70 and 80, the inner peripheral surfaces on both ends (the end portions in the arrow L - R direction) of the paper tube 100 are gripped by the chuck jaws 70 and 80.

[0033] As will be described later, when the main spindle chuck 7 rotates by the driving force applied from the main spindle base 6 (main spindle) with both ends of the paper tube 100 gripped by the chuck claws 70 and 80, the driven chuck 8 rotates around the bearing 13 following the rotation. As a result, the paper tube 100 also rotates around the axis C, and the paper tube 100 is cut by the cutting edges of the rotary blades 2 to 4 being inserted into the paper tube 100 in such a rotating state.

[0034] The cutting of each of the rotary blades 2 to 4 toward the paper tube 100 is performed by the sliding displacement of each of the rotary blades 2 to 4 by the slide units 15a to 15c. Since the slide units 15a to 15c that support these rotary blades 2 to 4 each have the same configuration, in the following description, the configuration of the slide unit 15a that supports the main spindle side rotary blade 2 will be mainly described, and the slide units 15b and 15c that support the driven side rotary blade 3 and the center rotary blade 4 will be given the same reference numerals as the slide unit 15a and the detailed description thereof will be omitted.

[0035] As shown in FIG. 2, the slide unit 15a includes a flat bottom plate 150 extending in the front-rear direction (arrow F - B direction), and this bottom plate 150 is fixed to the upper surface of the housing 5. From the front end (the end on the arrow F side) of the bottom plate 150, a front wall 151 rises upward, and from the rear end (the end on the arrow B side) of the bottom plate 150, a rear wall 152 rises upward.

[0036] Between the front wall 151 and the rear wall 152, a guide rod 153 extending in the front-rear direction is spanned, and a rectangular parallelepiped block 154 is slidably engaged with the guide rod 153. A support plate 155 is fixed to the upper surface of the block 154, and the displacement of the support plate 155 along the front-rear direction is guided by the guide rod 153 by the sliding of the block 154 along the guide rod 153.

[0037] Although illustration is omitted, a pair of guide rods 153 are provided at intervals in the left - right direction, and a screw shaft 156 of a ball screw is provided between the pair of guide rods 153. The screw shaft 156 extends in the front - rear direction and is bridged between the front wall 151 and the rear wall 152. A nut (not shown) of the ball screw is engaged with the screw shaft 156. The nut of the ball screw is fixed to the lower surface of the support plate 155, and a handle 157 is attached to the rear end of the screw shaft 156 that penetrates the rear wall 152. Therefore, by rotating the screw shaft 156 by operating the handle 157, a driving force for operating the support plate 155 (nut of the ball screw) in the front - rear direction is applied.

[0038] From the rear - end side (the end on the arrow B side) of the support plate 155 of the slide unit 15a, a mounting plate 16 rises upward, and a bracket 17 is fixed to the front surface (the surface facing the arrow F side) of the mounting plate 16. The bracket 17 protrudes forward from the mounting plate 16, and a bearing 18 for pivotally supporting each of the rotary blades 2 - 4 is fixed to the front - end side of the bracket 17.

[0039] The axial directions of the rotation axes of each of the rotary blades 2 - 4 (bearing 18) are all parallel to the left - right direction, and by operating the handle 157 described above, each of the rotary blades 2 - 4 can slide in the front - rear direction. In the following description, the direction in which each of the rotary blades 2 - 4 slides toward the paper tube 100 side (axis C side) by operating the handle 157 is described as the cutting direction.

[0040] In the paper tube cutting device 1, by cutting both ends of a large - diameter tube 100a (see FIG. 3) of the paper tube 100 having a relatively large diameter (inner diameter) and both ends of a medium - diameter tube 100b (see FIG. 6) having a smaller diameter (inner diameter) than the large - diameter tube 100a with the rotary blades 2 and 3, it is possible to manufacture one cylinder for hand - held fireworks (of normal length) held by both hands. Also, in the paper tube 100, by cutting three locations, i.e., both ends and the central side of a small - diameter tube 100c (see FIG. 8) having the smallest diameter (inner diameter), it is possible to manufacture two cylinders for hand - held fireworks (so - called yokan) held by one hand with the rotary blades 2 - 4.

[0041] First, a method of cutting only both ends of the large-diameter pipe 100a with the rotary blades 2 and 3 will be described with reference to FIGS. 3 to 5. FIG. 3 is a partially enlarged top view of the paper tube cutting device 1 as viewed in the direction of arrow D in FIG. 1, FIG. 4 is a partially enlarged cross-sectional view of the paper tube cutting device 1 taken along line IV-IV in FIG. 3, and FIG. 5 is a partially enlarged cross-sectional view of the paper tube cutting device 1 taken along line V-V in FIG. 3. In FIG. 3, the large-diameter pipe 100a (paper tube 100) held by the chuck jaws 70 and 80 is shown by a two-dot chain line.

[0042] As shown in FIGS. 3 and 4, the driven rotary blade 3 for cutting the other end (the end on the arrow R side) of the large-diameter pipe 100a is configured to be slidable along the rail 19. The rails 19 are provided in a pair at intervals in the front-rear direction (arrow L-R direction), and each of these pairs of rails 19 extends linearly along the left-right direction.

[0043] A pair of blocks 20 arranged in the left-right direction are slidably engaged with each of the pair of rails 19 (see FIG. 4). These rails 19 and blocks 20 have the same configuration as the rails 9 and blocks 10 for sliding the driven chuck 8 described above. The bottom plate 150 of the slide unit 15b that supports the driven rotary blade 3 is fixed to the upper surface of the block 20.

[0044] As a result, the slide displacement of the slide unit 15b itself along the rail 19 (left-right direction) becomes possible. That is, the driven rotary blade 3 can be slid in the left-right direction on the rail 19 in addition to the slide displacement in the cutting direction (arrow F-B direction) on the slide unit 15b, and by this slide along the rail 19, the cutting position of the driven rotary blade 3 is configured to be variable in the left-right direction.

[0045] The slide displacement of the driven rotary blade 3 along the rail 19 is restricted by the main shaft side stopper 21a and the driven side stopper 21b attached to the upper surface of the housing 5. Each of these stoppers 21a and 21b is composed of a stopper portion 210 made of a rubber-like elastic body and an L-shaped support portion 211 that supports the stopper portion 210 on the upper surface of the housing 5.

[0046] The support portions 211 of the stoppers 21a and 21b are fixed to the housing 5 between the opposing pair of rails 19. In this fixed state, the stopper portions 210 of the stoppers 21a and 21b face the slide unit 15b (bottom plate 150) in the left-right direction.

[0047] The stopper portion 210 of the spindle-side stopper 21a is disposed on the displacement locus of the slide unit 15b (bottom plate 150) facing the spindle chuck 7 side (arrow L side). Therefore, the slide displacement of the driven-side rotary blade 3 facing the spindle chuck 7 side is restricted by the contact between the slide unit 15b and the spindle-side stopper 21a (stopper portion 210).

[0048] The stopper portion 210 of the driven-side stopper 21b is disposed on the displacement locus of the slide unit 15b (bottom plate 150) facing away from the spindle chuck 7 side (arrow R side). Therefore, the slide displacement of the driven-side rotary blade 3 moving away from the spindle chuck 7 is restricted by the contact between the slide unit 15b and the driven-side stopper 21b (stopper portion 210). The positioning of the driven-side rotary blade 3 is performed by the contact between each of these stoppers 21a and 21b and the slide unit 15b.

[0049] Further, the slide displacement of the driven chuck 8 along the rail 9 is restricted by a chuck stopper 22 (see FIG. 4) attached to the upper surface of the housing 5. The chuck stopper 22 includes a stopper portion 220 made of a rubber-like elastic body, an L-shaped support portion 221 that supports the stopper portion 220 on the upper surface of the housing 5, and a clamp portion 222 for fixing the support portion 221 to the housing 5.

[0050] Columnar large-diameter pins 23a and medium-diameter pins 23b for gripping by the clamp portion 222 are fixed to the upper surface of the housing 5. These pins 23a and 23b are provided in a pair side by side in the left-right direction, and the large-diameter pin 23a is disposed at a position (arrow R side) farther from the spindle chuck 7 side than the medium-diameter pin 23b.

[0051] The large-diameter pin 23a is grasped by the clamp portion 222 when cutting the large-diameter pipe 100a, and the medium-diameter pin 23b is grasped by the clamp portion 222 when cutting the medium-diameter pipe 100b (see Fig. 6). Since a known configuration (pin hole clamp) can be adopted for the clamp portion 222 that grasps these pins 23a and 23b, a detailed description thereof will be omitted. As a known configuration, the technology described in Japanese Patent Application Laid-Open No. 2023-019607 is exemplified.

[0052] When the chuck stoppers 22 are fixed to the respective pins 23a and 23b, the stopper portion 220 of the chuck stopper 22 faces the support plate 11 (see Fig. 4) in the left-right direction. That is, the stopper portion 220 of the chuck stopper 22 is located on the displacement locus of the support plate 11 in the direction approaching the main spindle chuck 7 side (arrow L side). Therefore, the slide displacement of the driven chuck 8 (chuck jaws 80) toward the main spindle chuck 7 side is restricted by the contact between the support plate 11 and the chuck stopper 22 (stopper portion 220). By this contact, the positioning of the driven chuck 8 is performed.

[0053] When cutting both ends of the large-diameter pipe 100a with the respective rotary blades 2 and 3, first, the driven chuck 8 is positioned by the chuck stopper 22 fixed to the large-diameter pin 23a, and this positioned state is fixed by the clamper 14 (see Fig. 1). After that, the cutting position of the driven-side rotary blade 3 is positioned by the driven-side stopper 21b, and this positioned state is fixed by a clamper (not shown). This clamper has the same configuration as the above-described clamper 14 (see Fig. 1).

[0054] After positioning the driven chuck 8 and the driven-side rotary blade 3, the large-diameter pipe 100a is rotated around the axis C by the driving force of the spindle chuck 7 (spindle), and the handle 157 is operated to slide each rotary blade 2, 3 toward the rotating large-diameter pipe 100a. Since each rotary blade 2, 3 is pivotally supported by a bearing 18 (see FIG. 2) so as to be freely rotatable, when each rotary blade 2, 3 contacts the rotating large-diameter pipe 100a, each rotary blade 2, 3 rotates following the rotation of the large-diameter pipe 100a. By this rotation (driven with respect to the large-diameter pipe 100a) of each rotary blade 2, 3, both ends of the large-diameter pipe 100a are cut by each rotary blade 2, 3.

[0055] The chuck jaws 70, 80 that grip the inner peripheral surfaces of both ends of the large-diameter pipe 100a are arranged on the front side (arrow F side) in the cutting direction of each rotary blade 2, 3. Therefore, when cutting the large-diameter pipe 100a, the driven-side rotary blade 3 is cut toward the chuck jaws 70, 80. A groove 73 (see FIG. 3) is formed in the chuck jaw 70 of the spindle chuck 7 to prevent contact with the spindle-side rotary blade 2 during this cutting.

[0056] The groove 73 is a recess that linearly extends in the direction around the axis C (the rotation direction of the large-diameter pipe 100a) on the outer peripheral surface of the protruding portion 72 of the chuck jaw 70, and the groove 73 is formed in each of a plurality (three) of chuck jaws 70. When viewing the chuck jaw 70 in the cutting direction (arrow F-B direction) of the spindle-side rotary blade 2, the groove 73 is formed at a position where the cutting edge of the spindle-side rotary blade 2 overlaps. When cutting the large-diameter pipe 100a, the spindle-side rotary blade 2 is cut toward the groove 73.

[0057] In addition, large-diameter grooves 83a and medium-diameter grooves 83b arranged in the left-right direction are formed in the chuck jaw 80 of the driven chuck 8. The large-diameter groove 83a is a groove used when cutting the large-diameter pipe 100a, and the medium-diameter groove 83b is a groove used when cutting the medium-diameter pipe 100b (see FIG. 6). The large-diameter groove 83a is formed at a position closer to the spindle chuck 7 side (arrow L side) than the medium-diameter groove 83b.

[0058] The grooves 83a and 83b are recesses that linearly extend in the direction around the axis C (the rotation direction of the large-diameter pipe 100a) on the outer peripheral surface of the protruding portion 82 of the chuck jaw 80, and the grooves 83a and 83b are formed in each of the plurality (three) of chuck jaws 80.

[0059] In a state where the position of the driven-side rotary blade 3 is positioned by the driven-side stopper 21b and the driven chuck 8 is positioned by the chuck stopper 22 fixed to the large-diameter pin 23a (the states in FIGS. 3 and 4), when the chuck jaw 80 is viewed in the cutting direction of the driven-side rotary blade 3 (arrow F-B direction), it is arranged at a position where the large-diameter groove 83a and the cutting edge of the driven-side rotary blade 3 overlap. Therefore, by sliding the driven-side rotary blade 3 toward the large-diameter pipe 100a in this state, the driven-side rotary blade 3 cuts into the large-diameter groove 83a.

[0060] Thus, in the present embodiment, the grooves 73, 83a, and 83b that extend in the direction around the axis C are formed on the outer peripheral surfaces of the chuck jaws 70 and 80, and when cutting the large-diameter pipe 100a, each rotary blade 2 and 3 cuts toward the grooves 73 and 83a.

[0061] As a result, as shown in the enlarged portion of FIG. 5, when the main spindle-side rotary blade 2 cuts inside the inner peripheral surface of the large-diameter pipe 100a, the cutting edge of the main spindle-side rotary blade 2 can be received inside the groove 73 of the chuck jaw 70. Also, although not shown, similarly for the driven-side rotary blade 3 (see FIG. 4), when it cuts inside the inner peripheral surface of the large-diameter pipe 100a, the cutting edge of such a driven-side rotary blade 3 can be received inside the groove 83a. Therefore, it is possible to prevent each rotary blade 2 and 3 from contacting the chuck jaws 70 and 80, and thus it is possible to suppress damage to each rotary blade 2 and 3 and the chuck jaws 70 and 80.

[0062] As shown in Fig. 3, by cutting each of the rotary blades 2 and 3, the large-diameter pipe 100a is separated into a processed product 101a used as a tube of a hand-held fireworks tube and an end material 102a separated from the processed product 101a. After these cuttings, the inner peripheral surfaces of both the processed product 101a and the end material 102a are gripped by the chuck jaws 70 and 80. That is, since the rotary blades 2 and 3 cut into the grooves 73 and 83a formed on the outer peripheral surfaces of the chuck jaws 70 and 80, the processed product 101a after cutting of the large-diameter pipe 100a is not separated from each of the chucks 7 and 8 (chuck jaws 70 and 80). Therefore, even at the end of the cutting by each of the rotary blades 2 and 3, the large-diameter pipe 100a can be stably rotated, so that the processed product 101a can be appropriately cut by each of the rotary blades 2 and 3.

[0063] Next, with reference to Fig. 6, a method of cutting a medium-diameter pipe 100b having a diameter (inner diameter) smaller than that of the large-diameter pipe 100a and a shorter length will be described. Fig. 6 is a partially enlarged cross-sectional view of the paper tube cutting device 1 showing a state of cutting the medium-diameter pipe 100b. Note that in Fig. 6, a cross-section cut in the same plane as Fig. 4 is shown.

[0064] As shown in Fig. 6, when cutting the medium-diameter pipe 100b, the chuck stopper 22 removed from the large-diameter pin 23a is fixed to the medium-diameter pin 23b (the medium-diameter pin 23b is gripped by the clamp portion 222). Next, by sliding the driven chuck 8 (block 10 and support plate 11) along the rail 9, the support plate 11 is brought into contact with the chuck stopper 22 (stopper portion 220) fixed to the medium-diameter pin 23b. On the other hand, the slide unit 15b (bottom plate 150) that supports the driven-side rotary blade 3 is kept in contact with the stopper portion 210 of the driven-side stopper 21b.

[0065] In this state, when the chuck jaws 80 are viewed in the cutting direction of the driven-side rotary blade 3, they are arranged at a position where the middle-diameter groove 83b and the cutting edge of the driven-side rotary blade 3 overlap. This is because the distance between the large-diameter pin 23a and the middle-diameter pin 23b in the left-right direction is the same as the distance between the large-diameter groove 83a and the middle-diameter groove 83b in the same direction. Therefore, by cutting the driven-side rotary blade 3 of the driven chuck 8 into the groove 83b in this state, the middle-diameter pipe 100b can be cut by the driven-side rotary blade 3.

[0066] As described above, in this embodiment, on the chuck jaws 80 of the driven chuck 8, a large-diameter groove 83a (first groove) and a middle-diameter groove 83b (second groove) are formed side by side in the left-right direction, and the driven chuck 8 is slidable to a position (first position) where the driven-side rotary blade 3 cuts into the large-diameter groove 83a and a position (second position) where the driven-side rotary blade 3 cuts into the middle-diameter groove 83b. Thereby, without changing the position of the driven-side rotary blade 3, by adjusting the position of the driven chuck 8 according to the lengths of the large-diameter pipe 100a and the middle-diameter pipe 100b, the large-diameter pipe 100a and the middle-diameter pipe 100b with different lengths can be cut. Therefore, the versatility of the paper tube cutting device 1 can be improved.

[0067] Although not shown in the figure, it is also possible to cut into the grooves 83a and 83b by changing the cutting position of the driven-side rotary blade 3 along the rail 19 instead of changing the position of the driven chuck 8. That is, for example, from the state of FIG. 6, the cutting position of the driven-side rotary blade 3 is slid along the rail 19, and the driven-side rotary blade 3 may be cut into the large-diameter groove 83a. Thereby, both ends of the middle-diameter pipe 100b can be cut at different lengths. Similarly, when cutting the large-diameter pipe 100a, by changing the cutting position of the driven-side rotary blade 3 to the middle-diameter groove 83b (and accordingly changing the mounting position of the driven-side stopper 21b) from the state of FIG. 4, both ends of the large-diameter pipe 100a can be cut at different lengths.

[0068] Next, referring to FIGS. 7 to 9, a case of manufacturing a tube for hand-held fireworks with a smaller diameter (inner diameter) than the middle-diameter tube 100b will be described. First, referring to FIG. 7, the configuration of the support unit 24 used when cutting the smaller-diameter tube 100c will be described. FIG. 7 is a front perspective view of the support unit 24.

[0069] As shown in FIG. 7, the support unit 24 includes a flat bottom plate 240 extending in the left-right direction (arrow L-R direction). On the upper surface of this bottom plate 240, a pair of a main shaft side unit 241a and a driven side unit 241b arranged in the same direction are provided.

[0070] Each of these units 241a and 241b has the same configuration. Therefore, in the following description, the configuration of the main shaft side unit 241a will be mainly described, and the driven side unit 241b will be given the same reference numeral as the main shaft side unit 241a and the detailed description thereof will be omitted.

[0071] The main shaft side unit 241a includes a support plate 242 whose lower end is fixed to the bottom plate 240. The support plate 242 is formed in a flat plate shape extending vertically. From the upper end of the support plate 242, a pair of protrusions 242a and 242b arranged in the front-rear direction (arrow F-B direction) protrude upward. Of the pair of protrusions 242a and 242b, the one arranged at a position closer to each of the rotary blades 2 to 4 (arrow B side) is the protrusion 242a. The height of the protrusion 242a from the upper end of the support plate 242 is formed lower than the height of the protrusion 242b.

[0072] A pair of support plates 242 are provided side by side in the left-right direction, and a cylindrical lower roller 25 and a side roller 26 are pivotally supported between the opposing sides of this pair of support plates 242. The lower roller 25 is bridged between the protrusions 242a of the pair of support plates 242, and the side roller 26 is bridged between the protrusions 242b. Each of these rollers 25 and 26 is a roller for supporting the smaller-diameter tube 100c (see FIG. 8) from below.

[0073] The upper surface 242c of the support plate 242 that connects the protrusions 242a and 242b to each other in the front and rear directions is formed in an arc shape centered on the axis C of the main shaft (not shown), that is, in a curved shape along the outer peripheral surface of the small-diameter pipe 100c (see FIG. 8). Thereby, contact between the small-diameter pipe 100c and the upper surface 242c of the support plate 242 when the small-diameter pipe 100c is supported by each of the rollers 25 and 26 is prevented.

[0074] On the front side (arrow F side) of the side roller 26, a support plate 243 whose lower end is fixed to the bottom plate 240 is provided. The support plate 243 is formed in a flat plate shape extending vertically, and at the upper end of the support plate 243, a flat plate-shaped mounting plate 244 extending in the front-rear direction (arrow F-B direction) is rotatably supported. A pair of upper rollers 27 arranged in the front-rear direction are attached to the mounting plate 244. This pair of upper rollers 27 are rollers for pressing the small-diameter pipe 100c (see FIG. 8) from above.

[0075] By rotating the mounting plate 244 with respect to the support plate 243, the pair of upper rollers 27 (mounting plate 244) are configured to be displaceable between a retracted position where they retract from the upper region of the small-diameter pipe 100c (opening the upper surface of the small-diameter pipe 100c) and a pressing position where they press the upper surface of the small-diameter pipe 100c. The state of being arranged at this pressing position is fixed by the clamp 245.

[0076] On the rear side (arrow B side) of the lower roller 25, support plates 246a and 246b for supporting the clamp 245 are provided. The lower end of the support plate 246a is fixed to the bottom plate 240, and the support plate 246a is formed in a flat plate shape extending upward from the bottom plate 240. A flat plate-shaped support plate 246b extending vertically is fixed to the upper end of the support plate 246a, and the clamp 245 is fixed to the upper end of this support plate 246b. Since the clamp 245 can employ a known toggle clamp, a detailed description is omitted, but examples of known toggle clamps are those described in Japanese Patent Application Laid-Open No. 2005-297322.

[0077] The clamp 245 is configured to be able to form a state in which the mounting plate 244 disposed at the pressing position is pressed from above to restrict the rotation of the upper roller 27 (mounting plate 244) to the retracted position, and a state in which the restriction state (the state of pressing the upper surface of the mounting plate 244) is released to allow the rotation of the upper roller 27 (mounting plate 244) to the retracted position.

[0078] Handles 247 are attached to both ends of the bottom plate 240 in the left - right direction. By lifting the support unit 24 with these handles 247, the support unit 24 (each roller 25 - 27) is attached to and detached from the housing 5 (see FIG. 8). A clamper 248 is provided between the handle 247 and the support plate 242. This clamper 248 is the same pin - hold clamper as the clamp portion 222 (see FIG. 4) of the above - mentioned chuck stopper 22. Although not shown, a pin for gripping by this clamper 248 is fixed to the upper surface of the housing 5.

[0079] Next, with reference to FIGS. 8 and 9, a method for cutting the small - diameter pipe 100c supported by the support unit 24 will be described. FIG. 8 is a partially enlarged top view of the paper - tube cutting device 1 showing the state of cutting the small - diameter pipe 100c supported by the support unit 24, and FIG. 9 is a partially enlarged cross - sectional view of the paper - tube cutting device 1 taken along line IX - IX of FIG. 8.

[0080] In FIG. 8, the lower roller 25 hidden by the small - diameter pipe 100c is shown by a dashed line. Also, in FIG. 8, the paper - tube cutting device 1 is shown in the same range as FIG. 3, but the scale of FIG. 8 is larger than that of FIG. 3.

[0081] As shown in FIG. 8, when cutting the small - diameter pipe 100c, first, the support unit 24 that supports each roller 25 - 27 is attached to the upper surface of the housing 5. After attaching the support unit 24 to the upper surface of the housing 5, with the small - diameter pipe 100c placed on the lower roller 25 and the side roller 26, both ends of the small - diameter pipe 100c are gripped by the respective chuck jaws 70, 80 in the same procedure as the above - mentioned large - diameter pipe 100a.

[0082] At this time, whether to position the driven chuck 8 with the chuck stopper 22 fixed to the large-diameter pin 23a shown in Fig. 4 or with the chuck stopper 22 fixed to the medium-diameter pin 23b may be appropriately changed according to the length of the small-diameter pipe 100c. After gripping the small-diameter pipe 100c with the chuck jaws 70 and 80, the mounting plate 244 is rotated to press the upper surface of the small-diameter pipe 100c with the upper roller 27 and fixed with the clamp 245.

[0083] Next, the slide unit 15b (bottom plate 150) that supports the driven rotary blade 3 is slid along the rail 19 to the position where it contacts the spindle-side stopper 21a (stopper portion 210) (in the direction of arrow L), and this contact state is fixed with a clamper (not shown). Thereby, the cutting position of the driven rotary blade 3 when cutting the small-diameter pipe 100c is positioned.

[0084] After positioning the driven rotary blade 3, the small-diameter pipe 100c is rotated by the driving force of the spindle chuck 7 (spindle), and by operating the handle 157, each rotary blade 2 - 4 is slid toward the rotating small-diameter pipe 100c. Thereby, the small-diameter pipe 100c is cut by each rotary blade 2 - 4.

[0085] Among the rotary blades 2 - 4, the cutting of the spindle-side rotary blade 2 is performed in the gripping region of the small-diameter pipe 100c by the chuck jaw 70, similar to when cutting the large-diameter pipe 100a (see Fig. 3). On the other hand, the cutting by the driven rotary blade 3 is performed in the region between the chuck jaw 80 and the driven-side unit 241b (see Fig. 7), that is, on the central side in the longitudinal direction of the small-diameter pipe 100c rather than in the gripping region of the chuck jaw 80.

[0086] Also, the cutting of the central rotary blade 4 is performed in the region between the spindle-side unit 241a (see Fig. 7) and the driven-side unit 241b of the support unit 24, at an intermediate position (center) between the cutting position of the spindle-side rotary blade 2 and the cutting position of the driven rotary blade 3.

[0087] Of the small-diameter pipes 100c after being cut by each of these rotary blades 2 to 4, one end of the small-diameter pipe 100c cut by the main-spindle-side rotary blade 2 (the end on the arrow L side) is taken as the end material 101c, and the part cut in the region between the main-spindle-side rotary blade 2 and the center rotary blade 4 is taken as the processed product 102c. Also, of the small-diameter pipes 100c after being cut, the part cut in the region between the driven-side rotary blade 3 and the center rotary blade 4 is taken as the processed product 103c, and the other end of the small-diameter pipe 100c cut by the driven-side rotary blade 3 (the end on the arrow R side) is taken as the end material 104c. The processed products 102c and 103c are used as the tubes of hand-held fireworks.

[0088] The cutting of the small-diameter pipe 100c by the main-spindle-side rotary blade 2 is performed toward the groove 73 of the chuck jaw 70, similar to when cutting the large-diameter pipe 100a (see FIG. 3). For this reason, one end of the processed product 102c after being cut (the end on the arrow L side) is not separated from the main-spindle chuck 7. On the other hand, although the other end of the processed product 102c (the end on the arrow R side) is separated from the processed product 103c (chuck jaw 80) by the cutting of the center rotary blade 4, this processed product 102c is rotatably supported by each of the rollers 25 to 27. Therefore, the rotation of the small-diameter pipe 100c at the end of the cutting of the processed product 102c can be stabilized.

[0089] Also, since the cutting of the small-diameter pipe 100c by the driven-side rotary blade 3 is performed on the center side in the longitudinal direction of the small-diameter pipe 100c (the region where the chuck jaw 80 does not exist) rather than the chuck jaw 80, the other end of the processed product 103c after being cut (the end on the arrow R side) is separated from the chuck jaw 80. Also, similarly, one end of the processed product 103c (the end on the arrow L side) is separated from the processed product 102c (chuck jaw 70) by the cutting of the center rotary blade 4. That is, although both ends of the processed product 103c are separated from the chuck jaws 70 and 80, this processed product 103c is also rotatably supported by each of the rollers 25 to 27. Therefore, the rotation of the small-diameter pipe 100c at the end of the cutting of the processed product 103c can be stabilized.

[0090] Thus, in this embodiment, since the small-diameter pipe 100c is rotatably supported by the lower rollers 25 and the side rollers 26 arranged on the left and right of the central rotary blade 4, even when the central longitudinal portion of the small-diameter pipe 100c is cut by the central rotary blade 4, the rotation of the small-diameter pipe 100c (workpieces 102c, 103c) at the end of the cutting can be stabilized. Therefore, the small-diameter pipe 100c (workpieces 102c, 103c) can be cut appropriately.

[0091] Also, since the upper surface of the small-diameter pipe 100c is pressed by the upper roller 27 arranged above the lower roller 25 and the side roller 26, the workpiece 103c whose both ends are separated from the chuck jaws 70, 80 can be sandwiched from above and below by the rollers 25 to 27. Thereby, since the rotation of the small-diameter pipe 100c at the end of the cutting of the workpiece 103c can be stabilized, the small-diameter pipe 100c (workpiece 103c) can be cut appropriately.

[0092] As shown in FIG. 9, the central rotary blade 4 cuts the small-diameter pipe 100c by sliding along the guide rod 153 of the slide unit 15c (in the horizontal direction), and its rotation axis 40 (rotation center) is at the same height as the axis center C. On the other hand, the side roller 26 that supports the side surface of the small-diameter pipe 100c on the side opposite to the central rotary blade 4 has its rotation axis 260 (rotation center) located above the axis center C. Thereby, the force when the central rotary blade 4 cuts into the small-diameter pipe 100c (the force that pushes the small-diameter pipe 100c) can be effectively supported by the side roller 26. Therefore, since the cutting force of the central rotary blade 4 along the horizontal direction is less likely to escape in other directions, the small-diameter pipe 100c can be cut appropriately.

[0093] In order for the side roller 26 to effectively support the force when the central rotary blade 4 cuts into the small-diameter pipe 100c, it is sufficient that the rotation axis 260 of the side roller 26 is at least at the same height as the axis center C. However, it is particularly preferable that the rotation axis 260 (rotation center) of the side roller 26 is located above the axis center C as in the present embodiment. Thereby, when the central rotary blade 4 cuts into the small-diameter pipe 100c, the small-diameter pipe 100c is easily pushed downward of the side roller 26 by the force, so that the small-diameter pipe 100c can be stably supported by the lower roller 25 and the side roller 26.

[0094] Also, since the rotation axis 250 of the lower roller 25 is located closer to the central rotary blade 4 than the axis center C, the small-diameter pipe 100c can be stably supported by the lower roller 25 and the side roller 26 arranged on both the front and rear sides with the axis center C (small-diameter pipe 100c) in between. Thereby, the rotation of the small-diameter pipe 100c can be stabilized, so that the small-diameter pipe 100c can be appropriately cut.

[0095] As described above, in the present embodiment, when manufacturing a single-handed flashlight firework tube by cutting the small-diameter pipe 100c, the support unit 24 (each roller 25 to 27) is attached to the upper surface of the housing 5. On the other hand, when manufacturing a two-handed flashlight firework tube by cutting the above-mentioned large-diameter pipe 100a (see FIG. 3) and medium-diameter pipe 100b (see FIG. 6), the support unit 24 is removed from the housing 5.

[0096] This is because the rollers 25 to 27 are arranged according to the outer diameter of the small-diameter pipe 100c. For example, if the large-diameter pipe 100a and the medium-diameter pipe 100b are supported by the rollers 25 to 27, the centers of these pipes 100a and 100b will deviate from the axis center C. That is, if the purpose is simply to manufacture a single-handed flashlight firework tube, the support unit 24 (each roller 25 to 27) may not be removable from the housing 5. However, in such a configuration, the types of flashlight firework tubes that can be manufactured are reduced, so that the versatility of the paper tube cutting device 1 is lowered.

[0097] In contrast, in the present embodiment, by attaching and detaching the support unit 24 to and from the housing 5, a support state in which the small-diameter pipe 100c is supported by the rollers 25 to 27 and a non-support state in which the large-diameter pipe 100a and the medium-diameter pipe 100b are not supported by the rollers 25 to 27 can be formed. Thereby, even when the rollers 25 to 27 for manufacturing a single-handed hand-held firework tube (cutting the small-diameter pipe 100c) are provided, a double-handed hand-held firework tube having a larger diameter than that can be manufactured by the same paper tube cutting device 1. Therefore, the versatility of the paper tube cutting device 1 can be improved.

[0098] When aiming to form such a support state or non-support state, for example, it is also possible to slide the support unit 24 in the front-rear direction by a linear guide mechanism (a configuration similar to the above-described rail 19 and block 20). However, in such a configuration, since it is necessary to secure a space for sliding the support unit 24 on the upper surface of the housing 5, the paper tube cutting device 1 becomes larger.

[0099] In contrast, since the support unit 24 of the present embodiment is detachably attached to the upper surface of the housing 5, it is not necessary to provide a space for sliding the support unit 24 as described above, and a state in which the large-diameter pipe 100a and the medium-diameter pipe 100b are not supported by the rollers 25 to 27 and a state in which the small-diameter pipe 100c is supported by the rollers 25 to 27 can be formed. Therefore, the paper tube cutting device 1 (housing 5) can be downsized.

[0100] Here, since the inner diameters of the large-diameter pipe 100a and the medium-diameter pipe 100b are larger than the inner diameter of the small-diameter pipe 100c, the outer diameters of the chuck claws 70, 80 (protrusions 72, 82) when gripping the large-diameter pipe 100a and the medium-diameter pipe 100b are larger than the outer diameters of the chuck claws 70, 80 when gripping the small-diameter pipe 100c. For this reason, if the large-diameter pipe 100a or the medium-diameter pipe 100b is cut with the same cutting amount as when cutting the small-diameter pipe 100c, the main shaft side rotary blade 2 and the driven side rotary blade 3 may contact the chuck claws 70, 80 (the bottom surfaces of the grooves 73, 83a shown in FIG. 3).

[0101] In order to prevent contact between each of the rotary blades 2 and 3 and the chuck jaws 70 and 80 (the bottom surfaces of the grooves 73 and 83a), it is necessary to adjust the cutting amount of each of the rotary blades 2 and 3 according to the inner diameter of each of the tubes 100a to 100c (the outer diameter of the chuck jaws 70 and 80). The adjustment of this cutting amount may be automatically performed by NC control. However, in this embodiment, the cutting amount of each of the rotary blades 2 and 3 is adjusted by the large-diameter block 28a (see FIG. 5) and the small-diameter block 28b (see FIG. 9). Although not shown, when cutting the medium-diameter tube 100b shown in FIG. 6, the cutting amount of each of the rotary blades 2 and 3 is adjusted by the medium-diameter block.

[0102] That is, a plurality of blocks for adjusting the cutting amount of each of the rotary blades 2 and 3 are prepared according to the inner diameter of the paper tube 100 to be cut. In the following description, mainly with reference to FIG. 10, the configurations of the large-diameter block 28a and the small-diameter block 28b will be described. FIG. 10(a) is a partially enlarged cross-sectional view of the paper tube cutting device 1 taken along the line Xa-Xa in FIG. 5, and FIG. 10(b) is a partially enlarged cross-sectional view of the paper tube cutting device 1 taken along the line Xb-Xb in FIG. 9.

[0103] As shown in FIG. 10, the large-diameter block 28a and the small-diameter block 28b are formed in a substantially rectangular parallelepiped shape. The width dimensions of the respective blocks 28a and 28b in the left-right direction (the direction of the arrow L-R) are formed slightly smaller than the interval between the pair of guide rods 153 of the slide units 15a to 15c. Recesses 280 are formed in the lower surfaces of the blocks 28a and 28b at positions corresponding to the screw shafts 156 of the ball screws. The recesses 280 are formed in a semi-elliptical cross-sectional shape, and these recesses 280 penetrate both the front and rear surfaces of the blocks 28a and 28b.

[0104] By inserting the screw shafts 156 into the inside of the recesses 280 and inserting the blocks 28a and 28b between the pair of guide rods 153, the blocks 28a and 28b are sandwiched between the front wall 151 of the slide units 15a to 15c and the block 154 (see FIGS. 5 and 9).

[0105] Note that a handle 261 is attached to the upper surfaces of the blocks 28a and 28b. By the operator holding this handle 261, operations such as inserting the blocks 28a and 28b between the opposing front wall 151 and block 154, or removing the blocks 28a and 28b from between the opposing surfaces, are performed.

[0106] The thickness of the blocks 28a and 28b in the front - rear direction (arrow F - B direction) is formed to be a thickness corresponding to the inner diameters (diameters) of the large - diameter pipe 100a and the small - diameter pipe 100c. For example, as shown in FIG. 5, when the block 154 of the slide units 15a to 15c is slid until it contacts the large - diameter block 28a, the cutting edges of the respective rotary blades 2 and 3 are set to a thickness such that they do not contact the bottom surface of the grooves 73 and 83a and are accommodated inside the grooves 73 and 83a.

[0107] Also, similarly, the thickness of the small - diameter block 28b shown in FIG. 9 is set to a thickness such that when the block 154 of the slide units 15a to 15c is slid until it contacts the small - diameter block 28b, the cutting edge of the main - shaft - side rotary blade 2 does not contact the bottom surface of the groove 73 and is accommodated inside the groove 73.

[0108] In this way, by adjusting the cutting amount of the respective rotary blades 2 and 3 with the blocks 28a and 28b having a thickness corresponding to the inner diameters of the large - diameter pipe 100a and the small - diameter pipe 100c, even when cutting large - diameter pipes 100a and small - diameter pipes 100c with different inner diameters, it is possible to prevent the cutting edges of the respective rotary blades 2 and 3 from contacting the bottom surfaces of the grooves 73, 83a, and 83b of the chuck jaws 70 and 80. Therefore, breakage of the respective rotary blades 2 and 3 and the chuck jaws 70 and 80 can be suppressed.

[0109] As shown in FIG. 10, sensors 158a and 158b for detecting the presence or absence of blocks 28a and 28b are provided on the bottom plates 150 of the slide units 15a to 15c. As an example of these sensors 158a and 158b, switches or pressure-sensitive sensors (contact-type sensors) that are pushed in by the blocks 28a and 28b placed on the bottom plate 150 are exemplified. However, the sensors 158a and 158b may use other non-contact-type sensors such as optical sensors.

[0110] The presence or absence of the blocks 28a and 28b is detected by the sensors 158a and 158b. In a control device (not shown) provided in the paper tube cutting device 1, when the blocks 28a and 28b are not detected by the sensors 158a and 158b, the cutting of the large-diameter tube 100a and the small-diameter tube 100c by each of the rotary blades 2 to 4 is configured to be impossible. Examples of such a configuration include a configuration in which the rotation of each chuck 7 and 8 cannot be started (the main shaft does not start), and a configuration in which each chuck 7 and 8 rotates at a loose speed such that the large-diameter tube 100a and the small-diameter tube 100c cannot be cut.

[0111] In this way, when the blocks 28a and 28b are not detected by the sensors 158a and 158b, by disabling the cutting of the large-diameter tube 100a and the small-diameter tube 100c, it is possible to suppress the start of the cutting of the large-diameter tube 100a and the small-diameter tube 100c by the rotary blades 2 and 3 in a state where the blocks 28a and 28b are not placed on the bottom plate 150. Therefore, it is possible to suppress the excessive cutting of the large-diameter tube 100a and the small-diameter tube 100c by the rotary blades 2 and 3, and thus it is possible to suppress the cutting edges of the rotary blades 2 and 3 from contacting the bottom surfaces of the grooves 73, 83a, and 83b of the chuck jaws 70 and 80. Accordingly, it is possible to suppress the damage of the rotary blades 2 and 3 and the chuck jaws 70 and 80.

[0112] Also, in the present embodiment, the cutting of the large-diameter tube 100a and the small-diameter tube 100c can be started only when the blocks 28a and 28b corresponding to the inner diameters of the large-diameter tube 100a and the small-diameter tube 100c are placed on the bottom plate 150.

[0113] Specifically, sensors 158a and 158b are arranged at intervals in the left-right direction (arrow L-R direction), and a recess 282 is formed on the lower surface of the large-diameter block 28a at a position corresponding to the sensor 158a. Therefore, when the large-diameter block 28a is placed on the bottom plate 150, the sensor 158b is pushed in by the large-diameter block 28a, while the sensor 158a is not pushed in (the sensor 158a fits into the recess 282).

[0114] Also, no recess like the recess 282 of the large-diameter block 28a is formed on the lower surface of the small-diameter block 28b. Therefore, when the small-diameter block 28b is placed on the bottom plate 150, both sensors 158a and 158b are pushed in by the small-diameter block 28b.

[0115] That is, the pushing states of the plurality of sensors 158a and 158b change when the large-diameter block 28a and the small-diameter block 28b are placed on the bottom plate 150, and the types of the blocks 28a and 28b are determined from this change in the pushing state.

[0116] Furthermore, although not shown in the figure, a recess is formed only at a position corresponding to the sensor 158b on the lower surface of the medium-diameter block used when cutting the medium-diameter pipe 100b (see FIG. 6). Therefore, when the medium-diameter block is placed on the bottom plate 150, the sensor 158a is pushed in by the medium-diameter block, while the sensor 158b is not pushed in. Thus, it is determined whether the medium-diameter block is placed on the bottom plate 150.

[0117] Also, the paper tube cutting device 1 is provided with an inner diameter detecting means (not shown) for detecting the inner diameters of the respective tubes 100a to 100c from the positions (outer diameters) of the chuck jaws 70 and 80. Since a known configuration can be adopted for this inner diameter detecting means, a detailed description is omitted. Examples of the known configuration include the techniques described in Japanese Patent Application Laid-Open No. 2003-311591 and Japanese Patent Application Laid-Open No. 2007-307677.

[0118] When it is determined that the large-diameter pipe 100a is gripped by the chuck jaws 70 and 80 and that the large-diameter block 28a is placed on the bottom plate 150, only then do the chucks 7 and 8 start to rotate, enabling the cutting of the large-diameter pipe 100a. Similarly, when it is determined that the small-diameter pipe 100c is gripped by the chuck jaws 70 and 80, the cutting of the small-diameter pipe 100c becomes possible only when the small-diameter block 28b is placed on the bottom plate 150.

[0119] Thus, in this embodiment, there are provided sensors 158a and 158b (first detection means) capable of detecting the types of the blocks 28a and 28b, and an inner diameter detection means (second detection means) capable of detecting the diameters (inner diameters) of the large-diameter pipe 100a and the small-diameter pipe 100c gripped by the chucks 7 and 8. When the types (thicknesses) of the blocks 28a and 28b detected by these detection means correspond to the diameters (inner diameters) of the large-diameter pipe 100a and the small-diameter pipe 100c, the cutting of the large-diameter pipe 100a and the small-diameter pipe 100c is permitted. Thereby, since the cutting by the rotary blades 2 and 3 can be performed with a cutting amount corresponding to the diameter (inner diameter) of each pipe 100a and 100b, it is possible to reliably prevent the cutting edges of the rotary blades 2 and 3 from contacting the bottom surfaces of the grooves 73, 83a, and 83b of the chuck jaws 70 and 80. Therefore, damage to the rotary blades 2 and 3 and the chuck jaws 70 and 80 can be suppressed.

[0120] As described above, the present invention has been described based on the above embodiment. However, it is easily conceivable that the present invention is not limited to the above embodiment at all, and various modifications and improvements are possible without departing from the spirit of the present invention.

[0121] In the above embodiment, the case where one groove 73 is formed in the chuck jaw 70 and two grooves 83a and 83b are formed in the chuck jaw 80 has been described. However, it is not necessarily limited to this. For example, either one of the grooves 73, 83a, and 83b of either the chuck jaw 70 or the chuck jaw 80 may be omitted, or a plurality of grooves arranged in the left-right direction may be formed in the chuck jaw 70. Also, either one of the grooves 83a and 83b of the chuck jaw 80 may be omitted, or in addition to the grooves 83a and 83b, another groove may be added.

[0122] In the above embodiment, the case where the rotary blades 2 to 4 cut the paper tube 100 by being displaced in the horizontal direction has been described, but it is not necessarily limited to this. For example, the paper tube 100 may be cut by the rotary blades 2 to 4 that are displaced in a direction different from the horizontal direction (for example, the vertical direction). Further, the displacement of each of the rotary blades 2 to 4 is not limited to sliding (linear motion), and the paper tube 100 (each tube 100a to 100c) may be cut by the rotational displacement of each of the rotary blades 2 to 4.

[0123] In the above embodiment, the configuration in which the rotary blades 2 to 4 are pivotally supported by the bearing 18 so as to be freely rotatable, that is, the case where the rotary blades 2 to 4 are driven by the rotation of the paper tube 100 has been described, but a driving force for independently rotating each of the rotary blades 2 to 4 may be applied.

[0124] In the above embodiment, the case where the driven-side rotary blade 3 and the driven chuck 8 are slidable in the left-right direction has been described, but it is not necessarily limited to this. For example, the driven-side rotary blade 3 may be non-slidable in the left-right direction, or any one or all of the main-spindle-side rotary blade 2, the central rotary blade 4, and the main-spindle chuck 7 may be slidable in the left-right direction.

[0125] In the above embodiment, as an example of the structure for sliding each of the rotary blades 2 to 4 in the cutting direction, and the structure for sliding the slide unit 15b (driven-side rotary blade 3) and the driven chuck 8 in the left-right direction, the slide structure by the guide rod 153 and the block 154, and the slide structure by the rails 9, 19 and the blocks 10, 20 have been exemplified, but the slide displacement thereof may be guided by other known guides.

[0126] In the above embodiment, the case where the lower rollers 25, the side rollers 26, and the upper rollers 27 are arranged on both the left and right sides sandwiching the central rotary blade 4 has been described, but it is not necessarily limited to this. For example, the central rotary blade 4 and each of the rollers 25 to 27 may be omitted. Further, only the upper roller 27 may be omitted, and the paper tube 100 (small-diameter tube 100c) may be supported only by the lower rollers 25 and the side rollers 26.

[0127] In the above-described embodiment, the case where the rotation axis 260 of the side roller 26 is located above the axial center C has been described, but it is not necessarily limited to this. For example, the rotation axis 260 of the side roller 26 is preferably at least at the same height as the axial center C, but the rotation axis 260 may be located below the axial center C.

[0128] In the above-described embodiment, the case where the small-diameter pipe 100c is sandwiched at four points by the lower roller 25, the side roller 26, and the pair of upper rollers 27 has been described, but it is not necessarily limited to this. For example, one of the rollers 25 to 27 may be omitted and the small-diameter pipe 100c may be sandwiched at three points, or a roller different from the rollers 25 to 27 may be added and the small-diameter pipe 100c may be sandwiched at five or more points.

[0129] In the above-described embodiment, when cutting the small-diameter pipe 100c, the support unit 24 (each roller 25 to 27) is attached to the housing 5, while when cutting the large-diameter pipe 100a or the medium-diameter pipe 100b, the support unit 24 (each roller 25 to 27) is removed from the housing 5. However, it is not necessarily limited to this. For example, a support unit for supporting each of the rollers 25 to 27 arranged according to the outer diameter of the large-diameter pipe 100a or the medium-diameter pipe 100b may be prepared separately, and the support unit may be replaced according to the outer diameter of the paper pipe 100 to be cut. Further, the support positions of the rollers 25 to 27 in the support unit 24 may be made variable according to the outer diameter of the paper pipe 100.

[0130] In the above-described embodiment, the case where the cutting amount of each of the rotary blades 2 to 4 is adjusted by sandwiching the large-diameter block 28a or the small-diameter block 28b between the front wall 151 of the slide units 15a to 15c and the block 154 has been described, but it is not necessarily limited to this. For example, the cutting amount of each of the rotary blades 2 to 4 may be automatically adjusted by NC control.

[0131] In the above-described embodiment, when the blocks 28a and 28b are not detected by the sensors 158a and 158b, the cutting of the paper tube 100 (the large-diameter tube 100a or the small-diameter tube 100c) becomes impossible. On the other hand, when the types of the blocks 28a and 28b detected by the sensors 158a and 158b match the inner diameters of the paper tubes 100 (the large-diameter tube 100a or the small-diameter tube 100c) held by the respective chuck jaws 70 and 80, the cutting of the paper tube 100 is permitted. However, the present invention is not necessarily limited to this. For example, a configuration may be adopted in which the cutting of the paper tube 100 is permitted simply when the blocks 28a and 28b are detected by the sensors 158a and 158b (without determining the types of the blocks 28a and 28b). Further, the sensors 158a and 158b may be omitted.

Explanation of Reference Numerals

[0132] 1 Paper tube cutting device 2 Main shaft side rotary blade (first rotary blade) 3 Driven side rotary blade (first rotary blade) 4 Central rotary blade (second rotary blade) 70 Chuck jaw 73 Groove 80 Chuck jaw 83a Groove (first groove) 83b Groove (second groove) 151 Front wall (restricting wall) 153 Guide rod (guide) 154 Block (support) 155 Support plate (support) 158a, 158b Sensors (first detection means) 25 Lower roller (support roller) 250 Rotation shaft 26 Side roller (support roller) 260 Rotation shaft 27 Upper roller (pressing roller) 28a Large-diameter block (restricting member) 28b Small-diameter block (restricting member) 100 Paper tube 100a Large-diameter tube (paper tube) 100b Medium-diameter tube (paper tube) 100c Small-diameter tube (paper tube) C Axis

Claims

1. It includes a chuck jaw that rotates around the axis of the spindle and grips the inner peripheral surface of the paper tube, and a first rotary blade that cuts the paper tube rotated by the chuck jaw. A groove extending in the direction around the axis is formed on the outer peripheral surface of the chuck jaw. The first rotary blade is a paper tube cutting device characterized in that it cuts into the groove when cutting the paper tube.

2. It further includes a second rotary blade that cuts the central side of the paper tube in the axial direction relative to the first rotary blade, and support rollers that are arranged on both sides in the axial direction sandwiching the second rotary blade and rotatably support the paper tube. The paper tube cutting device according to Claim 1 is characterized by this.

3. The first rotary blade is configured to be movable to a first cutting position where it cuts the paper tube by cutting into the groove and a second cutting position where it cuts the central side of the paper tube in the axial direction relative to the chuck jaw. The paper tube cutting device according to Claim 2 is characterized by including a pressing roller that is arranged above the support roller and rotatably presses the upper surface of the paper tube.

4. The second rotary blade cuts the paper tube by being displaced in the horizontal direction. The support roller includes a side roller that supports the side surface of the paper tube on the side opposite to the second rotary blade and a lower roller that supports the paper tube from below. The rotation axis of the side roller is at the same height as the axis or located above the axis. The rotation axis of the lower roller is located on the second rotary blade side relative to the axis. The paper tube cutting device according to Claim 2 is characterized by this.

5. When the paper tube with a relatively small inner diameter is defined as a small-diameter tube and the paper tube with an inner diameter larger than that of the small-diameter tube is defined as a large-diameter tube. The paper tube cutting device according to Claim 2 is characterized in that it can form a support state in which the support roller supports the small-diameter tube when cutting the small-diameter tube and a non-support state in which the support roller does not support the large-diameter tube when cutting the large-diameter tube.

6. The first groove and the second groove are formed side by side in the axial direction on the chuck jaw. At least one of the chuck jaw and the first rotary blade is configured to be movable to a first position where the first rotary blade cuts into the first groove and a second position where the first rotary blade cuts into the second groove. The paper tube cutting device according to Claim 1 is characterized by this.

7. A guide extending in a horizontal direction orthogonal to the axial direction, a support configured to be slidable along the guide and supporting the first rotary blade, a regulating wall disposed on the front side in the sliding direction of the support, and a regulating member that regulates the slide of the support toward the front side in the sliding direction by being sandwiched between the regulating wall and the support. The paper tube cutting device according to claim 1, wherein the thickness of the regulating member in the sliding direction of the support is formed to be a thickness corresponding to the inner diameter of the paper tube.

8. It includes first detection means for detecting whether the regulating member is disposed between the support and the regulating wall. The paper tube cutting device according to claim 7, wherein when the regulating member is not detected by the first detection means, the cutting of the paper tube becomes impossible.

9. It includes the first detection means capable of detecting the type of the regulating member and second detection means capable of detecting the inner diameter of the paper tube gripped by the chuck jaws. The paper tube cutting device according to claim 8, wherein when the thickness of the regulating member detected by the first detection means and the inner diameter of the paper tube detected by the second detection means correspond to each other, the cutting of the paper tube is permitted.

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