JP2008168327A - Laser beam cutting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser beam cutting apparatus requiring no post process such as polishing and capable of obtaining a state of a consistent cut surface when cutting a pipe or a bar. <P>SOLUTION: The laser beam cutting apparatus (10) comprises a first roller (11) and a second roller (12) parallel to each other, a third roller (13) provided on the extension line of the axis (18) of rotation of the first roller (11) via a separation part (L1), and a fourth roller (14) provided on the extension line of the rotation axis (19) of the second roller (12) via the other separation part (L4), and a laser beam source (5) for applying laser beams to the separation part (L1). The first roller (11), the second roller (12), the third roller (13) and the fourth roller (14) are rotated in the same direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a laser cutting device for cutting a member to be cut by a laser light source.

Conventionally, when cutting a tube or a rod, cutting with a cutting tool or fusing by local heating is generally used. In the case of a thin glass tube or the like, a notch is cut into a portion to be cut with a cutting tool or the like, or local rapid heating and cooling are performed on the portion to cause cracks. After that, cutting is performed by applying a bending load to the notch portion or the crack occurrence portion and folding the glass tube or the like at the position (for example, Patent Document 1).
Japanese Patent Laying-Open No. 2002-241122 (FIG. 2)

However, in the case of a thin glass tube or the like, the state of the cut surface after breaking the notched portion or the crack occurrence portion is rough, and a post-process such as polishing is usually required for use as a product.
Furthermore, even when polishing or the like is performed, hair cracks that cannot be detected by sensory inspection may remain.

  An object of the present invention is to improve the quality of an object to be cut by a laser beam.

  In order to solve the above-described problem, the invention according to claim 1 is characterized in that a first roller and a second roller that are axially attached to a rotation shaft that is parallel to each other, and a separation portion on an extension line of the rotation shaft of the first roller. A third roller provided via the fourth roller, a fourth roller provided on another extension of the rotation axis of the second roller, and a laser between the first roller and the third roller. Each of the rollers in the order of the second roller, the first roller, the third roller, and the fourth roller in the rotation axis direction, or vice versa. The rollers are arranged so as to freely rotate in the same direction.

  According to the said structure, since a cut surface becomes uniform, the quality improvement of a to-be-cut object is achieved.

  According to a second aspect of the present invention, in addition to the first aspect, the first roller and the third roller may be connected to the rotation shafts on both sides of the separation portion on an extension line via other separation portions, respectively. The fifth roller and the sixth roller are provided, and the distance between the other separation portions is wider than the width of the second roller and the fourth roller in the rotation axis direction, and the second roller and the fourth roller The first roller, the third roller, the fifth roller, and the sixth roller are such that the interval between the rotation shafts is shorter than the sum of the radius of the first roller and the radius of the second roller. It is a feature.

  According to the said structure, a to-be-cut object is mounted stably. Thereby, a stable cutting process can be provided.

  According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, a pipe or a rod is provided between the second roller and the fourth roller and the first roller and the third roller. The laser light source melts the pipe or the bar rotating with the rotation of the first roller and the third roller.

  According to the said structure, when cutting the pipe or rod assumed as a long material, the mounting state of material does not fluctuate and it can provide the stable cutting process.

  According to a fourth aspect of the present invention, there is provided a first roller, a second roller, a third roller and a fourth roller, a laser light source for irradiating a laser beam between the first roller and the third roller, and the first roller An abutting member that abuts one end of a pipe or a rod placed between one roller and the second roller and between the third roller and the fourth roller, the second roller, the first roller The rotation centers of the roller, the third roller, and the fourth roller are positioned at the respective vertices of the trapezoidal shape in the horizontal direction in this order or in the reverse order, and the rollers freely rotate in the same direction. The third roller is provided on a line connecting the rotation center of the first roller and the rotation center of the third roller via a separation portion, and the fourth roller is provided with the second roller. The rotation center of the roller is connected to the rotation center of the fourth roller. The rotating shaft of at least one of the first roller to the fourth roller is separated from a contact portion between the pipe or the rod and the contact member. The other rollers are attached to the same rotating shaft or are parallel to each other.

  According to the above configuration, the rotation shaft of at least one roller is cut to the contact member side in the longitudinal direction of the rotation shaft of the pipe or rod by giving a predetermined angle with respect to the rotation shaft of the other roller. It is possible to apply a pressing force to the pipe or the rod to be performed, to prevent misalignment during processing, and to provide a more stable cutting process.

  According to a fifth aspect of the invention, in addition to the fourth aspect of the invention, the first roller and the third roller are respectively provided on both sides of the separation portion on the rotation axis extension line via other separation portions. The fifth roller and the sixth roller are provided, and the distance between the other separation portions is wider than the width of the second roller and the fourth roller in the rotation axis direction, and the second roller and the fourth roller The first roller, the third roller, the fifth roller, and the sixth roller are characterized in that the interval between the rotation shafts is shorter than the sum of the radii of the rollers.

  According to the above configuration, when cutting a pipe or rod that is assumed to be a long material, the mounting state of the material does not change, and it is possible to prevent the occurrence of deflection of the material due to its own weight and the occurrence of runout due to rotation. A cutting process can be provided.

  According to a sixth aspect of the present invention, in addition to the fourth or fifth aspect of the present invention, the pipe or bar includes the second roller, the fourth roller, the first roller, and the third roller. At least a part of the outer surface of the pipe or rod opposite to each roller and the pipe or rod, with the rotation center of the pipe or rod sandwiched between the roller and the pipe or rod when placed between the rollers. An auxiliary roller that comes into contact with is provided.

  According to the configuration, the pipe or the rod assumed as a material is placed between the second roller and the fourth roller, and the first roller and the third roller, and further on the outer surface. By bringing the auxiliary roller into contact with at least a part, the material loading state does not change, the material can be prevented from being bent due to its own weight, and the occurrence of run-out due to rotation can be prevented, and a stable cutting process can be provided. .

Invention according to claim 7, in the invention described in claims 3 to 6, wherein the pipe or rod is a glass tube, the laser light source, CO ₂ for irradiating a focused laser beam It is a laser light source.

  According to the said structure, a glass tube can be fused.

  The invention described in claim 8 is the invention described in any one of claims 3 to 7, wherein clean air or nitrogen gas is injected toward a portion of the pipe or the rod irradiated with the laser beam. It is characterized by that.

According to the above configuration, by generating a high-speed gas flow, the molten metal can be blown off by the heat input of the laser, and the optical path of the laser beam can be ensured. be able to.
Furthermore, since the oxidation reaction heat can be used for cutting in cutting metal by injecting clean air into the part of the pipe or rod to be melted, the cutting speed and processing limit can be improved.
Further, by injecting nitrogen gas into the part of the pipe or rod to be melted, cutting can be performed without generating an oxide film, and the cut surface can be made uniform.

  The invention according to claim 9 is provided with a laser cutting device and a conveyance unit, and the laser cutting device is the laser cutting device according to any one of claims 1 to 8. This is a laser cutting system.

  A laser cutting system can be provided by combining the laser cutting device and the transport unit.

  According to the laser cutting device of the present invention, it is possible to improve the quality of an object to be cut by laser light.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1A shows a front view of a laser cutting system 1 according to an embodiment of the present invention, and FIG. 1B shows a side view thereof.

  As shown in FIG. 1A, the laser cutting system 1 positions a processing portion of a material to be cut indicated by a work (pipe or bar) 8 that is an object to be cut, and uses a laser light source 5 to perform fusing. A cutting device 10 (hereinafter referred to as “cutting device”) and a transport unit 50 for supplying the workpiece 8 to the cutting device 10 as shown in FIG.

FIG. 2 is a schematic diagram illustrating details of the cutting device 10 of the laser cutting system 1.
The cutting device 10 will be described with reference to FIG. Here, FIG. 2A is a front view of the vicinity of the laser light source 5 of the cutting device 10, and FIG. 2B is a side view of the cutting device 10 taken along the line AA in FIG. It is what showed what was seen from.

  As shown in FIG. 2A, the cutting device 10 includes a first roller 11, a second roller 12, a third roller 13, a fourth roller 14, a fifth roller 15, and a sixth roller 16 on which the work 8 is placed. And a plurality of auxiliary rollers 30, a contact member (positioning plate) 17 that restrains the movement of the workpiece 8 in the longitudinal direction of the rotation axis, and a laser light source 5 that melts the workpiece 8.

The first roller 11, the second roller 12, the third roller 13, the fourth roller 14, the fifth roller 15, and the sixth roller 16 are configured to stably place the linear workpiece 8.
Further, the first roller 11, the third roller 13, the fifth roller 15, and the sixth roller 16 are attached to the same rotating shaft 18 in order to give the same rotation speed when each roller is driven to rotate. Moreover, the radius R of each roller 11, 13, 15, 16 is equal.

The installation positions of the fifth roller 15 and the sixth roller 16 can move in the horizontal direction, and are determined according to the length of the workpiece 8 in the longitudinal direction. Specifically, from the relationship with the installation positions of the first roller 11 and the third roller 13, the installation position is determined so that the workpiece 8 can rotate stably and the workpiece 8 can be fused.
Each of the rollers 11, 13, 15, and 16 is rotated by driving a common rotation shaft 18 by a roller rotation motor (not shown).

  As shown in FIG. 2A, the first roller 11, the third roller 13, the fifth roller 15, and the sixth roller 16 are each attached at a predetermined distance in the horizontal direction.

  Further, as shown in FIG. 2B, the rotation shafts 19 of the second roller 12 and the fourth roller 14 are the rotation shafts 18 of the first roller 11, the third roller 13, the fifth roller 15, and the sixth roller 16. In contrast, they are set parallel to each other and at a horizontal position.

  The second roller 12 and the fourth roller 14 are attached to the rotary shaft 19 at a predetermined distance in the horizontal direction. In the present embodiment, the radii of the second roller 12 and the fourth roller 14 are the same as the radii R of the first roller 11, the third roller 13, the fifth roller 15, and the sixth roller 16.

  The second roller 12 and the fourth roller 14 are pivotally attached to the rotary shaft 19 in a freely rotatable state, and the first roller 11, the third roller 13, the fifth roller 15 and the sixth roller 16 are not shown. When driven to rotate by the roller rotating motor, it can rotate in the same direction as the first roller 11, the third roller 13, the fifth roller 15 and the sixth roller 16 using a belt (not shown) (FIG. 2 ( b) Around the center of each of the rollers 11, 12, 13, 14, 15, 16, 30 in the direction of the arrows representing rotation). Thereby, the workpiece 8 rotates in the opposite direction.

  The rotation shafts 19 of the second roller 12 and the fourth roller 14 are rotated by the roller rotation motor (not shown) and the rotation shafts 18 of the first roller 11, the third roller 13, the fifth roller 15 and the sixth roller 16 are rotated. It may be rotated in synchronization.

  The inter-axis distance D between the rotation shaft 18 of the first roller 11, the third roller 13, the fifth roller 15 and the sixth roller 16 and the rotation shaft 19 of the second roller 12 and the fourth roller 14 is the first roller 11, The radius R of the third roller 13, the fifth roller 15, and the sixth roller 16 is shorter than the sum of the radius R of the second roller 12 and the fourth roller 14.

  As described above, by defining the distance D between the rotation axes in relation to the radius R of the roller, the first roller 11, the third roller 13, and the fifth roller 15 can be reliably manufactured even for the workpiece 8 having a small diameter. The workpiece 8 can be placed between the sixth roller 16 and the second roller 12 and the fourth roller 14, and the workpiece 8 is dragged by the rollers 11, 12, 13, 14, 15, 16. For example, it can be prevented from falling.

  Each roller can rotate freely without interfering with each other, in order of the sixth roller 16, the second roller 12, the first roller 11, the third roller 13, the fourth roller 14, the fifth roller 15, or its In the reverse order, they are arranged in the directions of the rotary shafts 18 and 19.

  Describing in detail the arrangement of the rollers in the horizontal direction, the first roller 11 and the third roller are provided via a separation portion L1, and the second roller 12 and the fourth roller 14 are provided outside the separation portion L1. Further, the fifth roller 15 and the sixth roller 16 are provided on both sides of the separation portion L1 via other separation portions L2 on the extension lines of the rotation shafts of the first roller 11 and the third roller 13. .

  Since the width of the other separation portion L2 is wider than the width L3 of the second roller 12 and the fourth roller 14, it is possible to prevent rollers having different rotation axes from interfering with each other during rotation.

  As described above, since the distance D between the rotation axes is shorter than the sum of the radiuses of the rollers (R + R), the first roller 11, the third roller 13, the fifth roller 15, the sixth roller 16, the second roller 12, The four rollers 14 can freely rotate without interfering with each other.

  As shown in FIG. 2A, the contact member 17 is on the outside of the first roller 11, the third roller 13, the fifth roller 15, and the sixth roller 16 on the extension line of the rotation shaft 18 in the direction of the fifth roller 15. is set up.

  The contact member 17 contacts the end surface of the work 8 in the longitudinal direction. In FIG. 2A, the contact member 17 is installed on the fifth roller 15 side, but it can also be installed on the sixth roller 16 side.

  Further, as shown in FIG. 2A, two auxiliary rollers 30 and 30 are arranged on the same plane as the second roller 12 and the fourth roller 14 so as to hold the work 8.

  The auxiliary roller 30 is opposite to the contact surface between each roller and the workpiece 8 when the workpiece 8 is placed between the second roller 12 and the fourth roller 14 and the first roller 11 and the third roller 13. It arrange | positions so that it may contact | abut at least one part of the outer surface of the workpiece | work 8 of the side.

  As described later, after the work 8 is placed on the first roller 11, the third roller 13, the fifth roller 15 and the sixth roller 16, and the second roller 12 and the fourth roller 14, The roller 30 moves downward in FIG. 2B and pinches the workpiece 8.

  The auxiliary roller 30 may determine the shape, size, etc. of the work 8 so that the vertical downward binding force in FIG. 2B can be efficiently applied according to the material to be cut. preferable.

  The contact surface of each of the rollers 11, 12, 13, 14, 15, 16 with the workpiece 8 is less slipped to transmit the rotational driving force to the workpiece 8, such as rubber or plastic. In consideration of the material of the workpiece 8 and the surface state in contact with the roller, it is preferable to use a material having high static friction. Further, an elastic buffer member such as rubber may be attached to the outer surface of each roller 11, 12, 13, 14, 15, 16.

  Here, between the 1st roller 11 and the 3rd roller 13, the separation part L1 which has a predetermined distance as mentioned above is provided. In the separation portion L1, the workpiece 8 placed on the roller is irradiated with the laser light collected from the laser light source 5, and the workpiece 8 is melted while being rotated.

  As shown in FIG. 2B, the laser light source 5 is slightly inclined from the vertical direction. This is a measure for preventing deterioration due to dust or the like when the laser light source 5 is used, and is an installation method recommended as a known technique.

  About the distance of the front-end | tip of the laser light source 5, and the workpiece | work 8, it is preferable to set according to the focal distance, capability, and characteristic of the laser beam to be used.

The laser beam may be one generally used for welding and fusing. For example, in the case of glass, a CO ₂ laser, in the case of metals such as aluminum and iron, a CO ₂ laser or a YAG (Yttrium / Aluminum / Garnet) laser, depending on the material to be blown It is preferable to select.

  Next, the conveyance unit 50 will be described with reference to FIG. FIG. 3 shows the flow of the conveyance in the order of (a) to (d), paying attention to the workpiece 8 which is a material to be cut in the conveyance unit 50, and the side surface as in FIG. 1 (b). It is explanatory drawing which looked at the conveyance part 50 from.

  As shown in FIG. 3A, the workpiece 8 rolls on the upper surface of the carry-in device 51 inclined downward from the hopper (not shown) toward the cutting device 10 and reaches the workpiece feeding jig 54. In FIG. 3A, the arrow shown at the top of the workpiece 8 indicates the direction of the hopper. Further, after a series of steps described later is completed, the workpiece 8 proceeds in the direction of the arrow described as the next step.

  Here, the carry-in device 51 is loaded in the longitudinal direction of the material (the depth direction in the drawing in FIG. 3A) so as to carry in while preventing the workpiece 8 which is a long material from dropping or swinging. It is preferable that the workpiece 8 can be placed in contact at a plurality of locations or the entire surface. For example, a plurality of plate-like members having a flat upper surface and a rod-like member having a flat upper surface are provided in parallel.

  The workpiece 8 that has reached the workpiece feeding jig 54 is stopped on the carry-in device 51 while it is in contact with the top 56 of the workpiece feeding jig 54 (not shown). The workpiece feeding jig 54 rotates in the direction of the counterclockwise arrow in FIG. 3A, and the groove portion 55 of the workpiece feeding jig 54 is on the descending inclined side of the upper surface of the carry-in device 51 as shown in FIG. One workpiece 8 is inserted into the groove 55 when it substantially coincides with the tip portion.

  Here, the workpiece feeding jig 54 is formed with a groove portion 55 for positioning the workpiece 8, and the groove portion 55 has a circumferential portion or the like when viewed from the front in FIG. It is cut out at the angle division position. In FIG. 3A, twelve notches are provided in 12 equal parts, that is, every 30 degrees in angle, but the number of groove portions 55 is not limited to this. And depending on control of a rotation angle, the position of the groove part 55 is not limited to the equally divided position.

  In addition, the shape of the notch of the groove 55 is also a substantially triangular shape in FIG. 3A, but it is determined depending on the handling of the material to be cut and the relationship with the carry-in device 51. It is not limited.

  Note that when the work feeding jig 54 is provided with twelve equal groove portions 55 as in the present embodiment, the work 8 is sequentially moved to a processing position to be described later one by one. It is a single intermittent rotation. However, this depends on the position of the groove 55, the shape of the material, etc., and is not limited.

  Next, as shown in FIG. 3 (b), the workpiece feeding jig 54 rotates counterclockwise, and the workpiece 8 inserted into the groove portion 55 comes into contact with the workpiece guide 53. Move along.

  As shown in FIG. 3B, when the groove portion 55 into which the workpiece 8 is inserted moves to the topmost portion that is the cutting position of the cutting device 10, the workpiece 8 is moved from the top of the workpiece guide 53 to the first roller 11. , The second roller 12, the third roller 13, the fourth roller 14, the fifth roller 15, and the sixth roller 16.

  When a sensor (not shown) detects that the workpiece 8 is inserted into the groove portion 55, the control device (not shown) lowers the auxiliary roller 30 as shown in FIG. 11, the second roller 12, the third roller 13, the fourth roller 14, the fifth roller 15, and the sixth roller 16 are restrained from three directions (see FIG. 2B).

  After the workpiece 8 is restrained from the three directions by the respective rollers, a roller rotation driving motor (not shown) rotates the rotation shaft 18. At this time, the rotating shaft 19 also rotates.

  The workpiece 8 rotates as the first roller 11, the third roller 13, the fifth roller 15, and the sixth roller 16 rotate. Note that it is desirable to select an appropriate value for the rotation speed depending on the material to be cut, the size, the shape, the capability of the laser light source, the installation position, and the like.

  The laser light source 5 irradiates the rotating workpiece 8 with a laser beam to melt the workpiece 8. At this time, the laser light source 5 can irradiate a laser beam uniformly on the circumference of the workpiece 8 by rotating the workpiece 8, and applies a deformation in the rotational direction to the workpiece 8 to be cut. Can be blown without

  After the workpiece 8 is rotated and melted, a roller rotation driving motor (not shown) is stopped, and a control device (not shown) raises the auxiliary roller 30 to an appropriate stop position and stops it.

  A sensor (not shown) transmits to the control device (not shown) that the auxiliary roller 30 has been detected to be lifted and stopped, and the control device (not shown) rotates the workpiece feeding jig 54.

  As the work feeding jig 54 rotates, the work 8 again comes into contact with the work guide 53, moves along the work guide 53, and returns to the state inserted in the groove 55.

  Then, as shown in FIG. 3 (d), the workpiece feeding jig 54 repeats intermittent counterclockwise rotation until the workpiece 8 inserted in the groove 55 contacts the upper surface of the unloader 52. When the workpiece 8 moves, the workpiece 8 rolls on the upper surface which is the descending slope of the unloader 52 from the groove portion 55 and moves to the next step.

  Next, based on FIG. 4, a case will be described in which the rotation axis of at least one roller shown in a cutting device 10 ′, which is a modification of the embodiment, has an inclination. In this modification, all of the third roller 13, the fourth roller 14, and the fifth roller 15 between the laser light source 5 and the contact member 17 are inclined (see FIG. 2). In the description, the relationship between the inclination of the fourth roller 14 ′ and the contact member 17 is described as a representative example, but the same applies to the third roller and the fifth roller.

  FIG. 4 schematically shows the relationship between the workpiece 8, the contact member 17, and the fourth roller 14 ′ in the modified example from the arrow B in FIG.

  The rotation shaft 19 ′ of the fourth roller 14 ′ has a predetermined angle θ with respect to the rotation shafts 18 (not shown) of the first roller 11, the third roller 13, the fifth roller 15 and the sixth roller 16. ing. The predetermined angle θ is such that when the fourth roller 14 ′ comes into contact with the work 8 with respect to the rotation shaft of another roller, the intersection of the extension line of the rotation shaft 19 ′ and the contact member 17 is the work 8. And the contact member 17 is inclined in the vertical direction so as to be separated from the contact portion.

  In this way, by giving the rotation shaft 19 ′ of the fourth roller 14 ′ an inclination with respect to the rotation shaft 18 of the first roller 11 or the like, toward the contact member 17 side in the longitudinal direction of the rotation shaft of the work 8, That is, a pressing force is applied to the workpiece 8 to be cut.

  In this way, by applying a pressing force in a certain direction and ensuring the restraint of the material to be processed, it is possible to prevent misalignment during processing that may occur due to vibration due to rotation, vibration, vibration of laser pulses, etc. Provide a stable cutting process.

  As described above, the contact member 17 is installed on the fifth roller 15 side in FIG. 2, but can also be installed on the sixth roller 16 side.

  However, in regard to the modified example, when the rotation shaft 19 ′ of the fourth roller 14 ′ has a predetermined angle θ with respect to the rotation shaft 18 such as the first roller 11, the fourth roller 14 ′. When the rotation shaft 19 'is extended in the direction of the contact member 17, the intersection of the extension line of the rotation shaft 19' and the contact surface of the contact member 17 is relative to the rotation center of the fourth roller 14 '. , It must be tilted away from the center of rotation of the workpiece 8. This is because the end of the roller abuts on the inclination of the rotation shaft 19 ′ of the fourth roller 14 ′ and the direction of the force pressing the workpiece 8 changes (see FIG. 4).

Next, another modification 10 ″ will be described with reference to FIG.
A high-pressure cylinder 101 is connected to the laser light source 5 by an introduction tube 102. Here, a compressed auxiliary gas 100 (clean air or nitrogen gas) is sealed in the high-pressure cylinder 101. When the laser light source 5 irradiates the workpiece 8 with the laser beam (see FIG. 2), the auxiliary gas is ejected from the conical tip portion of the laser light source 5 toward the workpiece 8 in the same direction as the optical path of the beam.
As the auxiliary gas 100, clean air or nitrogen gas is used depending on the type of cutting material and the required cutting quality.

  According to the present modification, the workpiece 8 is rotated to stabilize the laser irradiation conditions of the melted section, and the auxiliary gas 100 is injected to blow off the molten metal by the heat input of the laser, so that the optical path of the laser beam Therefore, the dimensional accuracy of the melted surface of the workpiece 8 can be secured, a smooth melted surface without cracks can be obtained, and high cutting quality can be provided.

  As described above, in the embodiment, it is possible to complete the cutting process of pipes and rods, which have conventionally required a plurality of processes of cutting and finishing, in addition to the conveying apparatus that enables automatic conveyance of the material to be cut. In combination with this, productivity can be improved and human work environment can be improved.

  Also, by positioning and fixing the material to be automatically cut, it is possible to prevent positional misalignment and the like, and to perform minimal local cutting, ensuring high-accuracy dimensions with little variation between products. be able to. Furthermore, since it is smooth and potential defects such as hair cracks can be eliminated as much as possible, the reliability of the product can be improved, and the productivity of subsequent processes such as the inspection process can be improved.

  Next, an example of a workpiece to which the present embodiment is applied is shown in FIG. The workpiece shown in FIG. 6 is used for, for example, a discharge tube, the ratio of the outer diameter to the total length (WD: WL) is 2-3: 1000, and the ratio of the wall thickness to the total length (WT: WL) is about 0.00. 8: 1000 long thin glass tube.

  The present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 is an overall view showing an embodiment of a laser cutting device to which the present invention is applied. It is the schematic diagram showing the detail about one Example of the cutting part of the laser cutting device of this invention. It is the schematic diagram which represented the flow of the conveyance in order of (a)-(d) paying attention to the pipe or rod which is the material cut | disconnected in the conveyance part of this invention. It is explanatory drawing about the relationship between the inclination of the 2nd roller of this invention, and the 4th roller, and a contact member. It is explanatory drawing about the other modification of this invention. It is side surface sectional drawing which shows an example of the workpiece | work with which the Example of this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laser cutting system 5 Laser light source 10 Cutting device (laser cutting device)
DESCRIPTION OF SYMBOLS 11 1st roller 12 2nd roller 13 3rd roller 14 4th roller 15 5th roller 16 6th roller 17 Contact member 18 Rotating shaft (1st roller, 3rd roller, 5th roller, 6th roller)
19 Rotating shaft (2nd roller, 4th roller)
20 Rotating shaft (auxiliary roller)
30 Auxiliary roller 50 Conveying part 51 Carrying-in device 52 Carrying-out device 53 Work guide 54 Work feed jig 55 Groove part 56 Top part Theta inclination angle

Claims (9)

A first roller and a second roller axially mounted on rotation axes parallel to each other;
A third roller provided via a separation portion on an extension line of the rotation shaft of the first roller, and a fourth roller provided via another separation portion on an extension line of the rotation shaft of the second roller;
A laser light source for irradiating laser light between the first roller and the third roller;
The rollers rotate freely in the same direction in the rotation axis direction in the order of the second roller, the first roller, the third roller, and the fourth roller, or vice versa. The laser cutting device characterized by the above-mentioned. A fifth roller and a sixth roller are provided on both sides of the separation portion on an extension line to the rotation shafts of the first roller and the third roller, respectively, via other separation portions,
An interval between the other spacing portions is wider than a width of the second roller and the fourth roller in the rotation axis direction.
The second roller and the fourth roller, the first roller, the third roller, the fifth roller, and the sixth roller are spaced apart from each other by a distance between the rotation axes and the second roller. Shorter than the sum of the radii of the rollers
The laser cutting device according to claim 1. A pipe or a rod is placed between the second roller and the fourth roller and between the first roller and the third roller;
3. The laser cutting device according to claim 1, wherein the laser light source melts and cuts the pipe or the bar rotating with the rotation. 4. A first roller, a second roller, a third roller and a fourth roller;
A laser light source for irradiating a laser beam between the first roller and the third roller;
An abutting member that abuts one end of a pipe or a rod placed between the first roller and the second roller and between the third roller and the fourth roller;
The rotation centers of the second roller, the first roller, the third roller, and the fourth roller are positioned at the vertices of the trapezoidal shape in the horizontal direction in this order or vice versa, and each roller Are arranged to rotate freely in the same direction,
The third roller is provided on a line connecting the rotation center of the first roller and the rotation center of the third roller via a separation portion,
The fourth roller is provided on a line connecting the rotation center of the second roller and the rotation center of the fourth roller via another separation portion, and is provided with at least one of the first to fourth rollers. The rotating shaft of the roller is inclined in the vertical direction so as to be away from the contact portion between the pipe or the rod and the contact member,
The said other roller is attached to the same rotating shaft, or is mutually parallel, The laser cutting device characterized by the above-mentioned. A fifth roller and a sixth roller are provided on both sides of the separation portion on the rotation axis extension line of the first roller and the third roller via other separation portions, respectively.
An interval between the other spacing portions is wider than a width of the second roller and the fourth roller in the rotation axis direction.
In the second roller and the fourth roller, the first roller, the third roller, the fifth roller, and the sixth roller, the interval between the rotation shafts is shorter than the sum of the radii of the rollers.
The laser cutting device according to claim 4. When the pipe or the rod is placed between the second roller and the fourth roller, and the first roller and the third roller, each roller and the pipe or the rod are brought into contact with each other. 6. The laser cutting device according to claim 4, further comprising an auxiliary roller that abuts at least a part of an outer surface of the pipe or rod opposite to the rotation center of the pipe or rod. . The pipe or the rod is a glass tube,
The laser cutting apparatus according to any one of claims 3 to 6, wherein the laser light source is a CO ₂ laser light source that irradiates a condensed laser beam.   The laser cutting device according to any one of claims 3 to 7, wherein clean air or nitrogen gas is injected toward a portion of the pipe or the rod irradiated with a laser beam. . A laser cutting system comprising a laser cutting device and a transport unit,
9. The laser cutting system according to claim 1, wherein the laser cutting device is the laser cutting device according to any one of claims 1 to 8.

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