JP4850002B2 - Pipe cutting device - Google Patents

Description

  The present invention relates to a pipe material cutting device for cutting a pipe material.

  Conventionally, as a device for cutting a metal tube, a pipe material cutting device as shown in Patent Document 1 has been proposed. As shown in FIG. 8, this pipe material cutting apparatus rotates the pipe material 53 by two drive roller members 52 provided on the upper surface of the apparatus main body 51, and pushes down the substantially disc-shaped cutter wheel 54, so that the pipe material 53 Is a device that cuts the tube material 53 by sandwiching it between the cutter wheel 54 and the drive roller member 52. In order to cope with the tube material 53 having different outer diameters, the push-down mechanism 55 that pushes down the cutter wheel 54 can be moved up and down. ing.

  As shown in FIG. 9, the push-down mechanism 55 is mounted in the column 56 and urges the slide member 57 upward, and is attached to the slide member 57 to lock the slide member 57 from rising. It comprises a ratchet member 59 and a lever handle 61 that pushes the cutter wheel 54 down to the position of the pipe 53. The ratchet member 59 includes a ratchet groove 62 formed on the front side of the column 56 and a ratchet claw 59a pivotally attached to the slide member 57. The ratchet claw 59a is provided by a spring 64 that urges the ratchet claw 59a in the clockwise direction. Although the ratchet pawl 59a is pressed and locked in the ratchet groove 62, the ratchet pawl 59a disengages from the ratchet groove 62 when a pressing force is applied to the slide member 57. In the state where the lifting force is applied to 57, the ratchet pawl 59a bites into the ratchet groove 62 so as not to allow the lifting.

  When the lever handle 61 is lifted in the upward direction, the protrusion 61a provided at the base end of the lever handle 61 presses the release protrusion 59b provided on the ratchet member 59, and the ratchet member 59 rotates to ratchet claw 59a. Thus, the ratchet groove 62 is removed and the slide member 57 can be raised and lowered, and the cutter wheel 11 can be adjusted to the outer diameter of the pipe material.

  When the lever handle 61 is rotated in the direction of pushing down, the cam 61b provided at the base end of the lever handle 61 presses the free arm 66 pivotally supported by the shaft support point 67 on the slide member 57, and the free arm 66 is The cutter wheel 54 is pivoted about the shaft fulcrum 67 so that the cutter wheel 54 is lowered.

  However, since the pressing mechanism 55 is composed of a large number of parts, there is a problem that the cost is increased and the weight of the apparatus is increased.

  In this tube cutting apparatus, a cutting assisting pressing roller 65 is pivotally supported coaxially with the cutter wheel 54. When the cutter wheel 54 is cut beyond the thickness of the workpiece, which is the tube material 53, and the rotational driving force on the workpiece is lost, the cutting assisting presser roller 65 is applied to the driving roller member 52. The workpiece is pressed to give a rotational force to the workpiece. The outer diameter difference between the cutter wheel 54 and the cutting assisting presser roller 65 may be substantially equal to the thickness of the work piece. The thickness differs between the maximum processing diameter and the minimum processing diameter, but the difference is an elastic cutting aid. It is absorbed by the presser roller 65. However, since the different thicknesses of the workpiece were absorbed by the elasticity of the cutting assisting pressure roller 65, the absorption width was narrow, and the thick tube material could not be cut. There was a problem that could not be done.

On the other hand, as shown in FIG. 8, a reamer 70 that is rotationally driven in conjunction with the drive roller 52 in order to remove the burrs on the cut cross section of the pipe material and improve the finish, as shown in FIG. However, since the reamer 70 protrudes from the tube cutting device, there is a problem that the entire width is increased. Further, the reamer 70 has a conical shape, and holds the cut tube material by hand, applies the cut surface of the tube material obliquely to the rotating reamer 70, and sequentially applies the cut surface of the tube material to remove burrs. There was a problem that the taking operation was complicated.
JP 2004-9275 A

  The present invention solves the above-mentioned conventional problems, reduces the number of parts, does not increase the cost, is light and small, can sufficiently cope with pipes of different wall thickness, and simplifies deburring work. A tubular material cutting device is provided.

  In order to solve the above problems, the present invention includes a driving roller member provided on the upper part of the apparatus body for receiving and rotating a workpiece, a support column installed on the body, and attached to the support column so as to be movable up and down. And a substantially disc-shaped cutter wheel rotatably attached to the slide member, and the workpiece is cut from the outer peripheral surface with the workpiece sandwiched between the drive roller member and the cutter wheel. In the tubular material cutting device, a rack is provided on the support column, a link member is pivotally supported on a first fulcrum on the upper part of the slide member, and the rack is mounted on a second fulcrum of the link-side tip of the link member. The rack and the pinion are engaged with each other by pivotally supporting a handle on which a pinion gear having the second fulcrum as the center of the pitch circle is formed and pushing the handle down from a predetermined handle position. The slide member is lowered, but when the handle is pushed up from a predetermined handle position, the rack and the pinion gear are disengaged, and the slide member can be raised and lowered. is there.

  When the handle is provided with a protrusion that contacts the link member, the handle is pushed up, and when the protrusion contacts the link member, the handle rotates about the first fulcrum, disengaging the rack and the gear, and sliding. It is preferable that the member can be raised and lowered.

  Moreover, it is preferable that the slide member is urged upward.

  Further, it is preferable that an arm whose tip is biased downward is pivotally supported on the slide member, and a cutting assisting pressing roller is pivotally supported on the tip of the arm.

  A substantially conical reamer that is rotationally driven in conjunction with the drive roller and has a conical surface provided with at least one blade is disposed inside the apparatus main body so that the tip of the reamer does not protrude from the apparatus main body. It is preferable.

  A rack is provided on the support column, the link member is pivotally supported on the first fulcrum at the upper part of the slide member, the second fulcrum at the end of the link side of the link member is engaged with the rack, and the second fulcrum is Since the handle on which the pinion gear at the center of the pitch circle is formed is pivotally supported, the number of parts can be reduced as compared with the prior art, and the weight of the apparatus can be reduced while contributing to cost reduction.

  If the handle is provided with a protrusion that contacts the link member, the handle is pushed up, and when the protrusion contacts the link member, the handle rotates about the first fulcrum to disengage the rack from the gear, and the slide member Therefore, the slide member can be raised and lowered in accordance with the outer diameter of the pipe material, and the pipe materials having different outer diameters can be cut. Further, the number of parts can be reduced as compared with the conventional case, and the weight of the apparatus can be reduced while contributing to cost reduction.

  If the slide member is configured to be biased upward, it can be instantly returned by one operation of rotating the handle in the direction of pushing up the handle, so even if the workpiece has a different size (outer diameter) for each work. After cutting, the tube can be instantly returned to the state, and the tube can be cut simply by operating the handle so that the slide member is pushed down from this state, reducing the time required for continuous cutting and lowering of the tube. It is possible to improve productivity.

  When a slide member is pivotally supported by a third fulcrum with an arm whose tip is biased downward, and a cutting assisting presser roller is pivotally supported at the tip of this arm, the arm of different thickness is covered. The cutting material can be cut.

  When the reamer is configured to rotate in conjunction with the drive roller, it is not necessary to provide an electric motor for rotating the reamer, and a light and small tube cutting device can be provided. Further, when the reamer is disposed inside the apparatus main body so that the tip of the reamer does not protrude from the apparatus main body, the outer shell of the apparatus main body serves as a safety cover that protects the rotation of the reamer and is safe. Further, since the reamer does not protrude from the apparatus main body, it is possible to provide a safe tube cutting device that does not catch the tip of the reamer with a foot or the like, and it is also possible to provide a lightweight and small tube cutting device. It becomes possible. In addition, if the reamer is a substantially conical reamer with at least one blade provided on the conical surface, the deburring operation is completed simply by applying the pipe material to the reamer in the direction of the reamer's rotation axis after cutting the pipe material. Therefore, it is possible to remove the burrs easily and reliably as compared with the conventional case.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a pipe cutting apparatus showing an embodiment of the present invention, FIG. 2 is a front view of the pipe cutting apparatus showing an embodiment of the present invention, and FIG. 3 is viewed from the opposite side of FIG. 4 is a side view of the tubular material cutting device, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. 1, showing the configuration of the gear. In FIG. 1, reference numeral 1 denotes an apparatus body having a box shape. The upper part of the apparatus main body 1 is open, and the driving roller 2 and the driven roller 3 are arranged in parallel at the same height, and are rotatably supported on the upper part of the apparatus main body 1. The driving roller 2 and the driven roller 3 are metal cylinders having the same or substantially the same outer diameter. The driving roller 2 and the driven roller 3 are close to each other, and a workpiece, which is a tube material, is received in a recess between the driving roller 2 and the driven roller 3. On the surfaces of the driving roller 2 and the driven roller 3, concave grooves 2a and 3a in which a cutter wheel 11 described later can intervene are formed.

  As shown in FIG. 4, the drive roller 2 is rotationally driven by an electric motor 5 through a plurality of gears. The plurality of gears includes a first gear 21 that decelerates the electric motor 5, a second gear 22 that meshes with the first gear 21 and decelerates, and a third gear that meshes with the second gear 22 and decelerates. And a fourth gear 24 provided coaxially with the drive roller 2 and meshing with the third gear 23 to increase the speed.

  On the other hand, the driven roller 3 is rotatably driven by the apparatus main body 1 without being driven to rotate by the electric motor 5.

  A toggle switch 6 for turning on / off the electric motor 5 is attached to the apparatus main body 1.

  A columnar column 7 is erected on the rear side of the driving roller 2 of the apparatus main body 1. A rack 7a is formed on the outer surface of the support column 7 on the drive roller 2 side. A slide member 8 is mounted on the column 7 so as to be movable up and down. The slide member 8 includes a hug 8 a that holds the column 7 and an arm 8 b that protrudes horizontally from the hug 8 a toward the drive roller 2. . The distal end portion of the arm portion 8b is bifurcated in the width direction of the pipe material cutting device.

  As shown in FIG. 5, a long hole 7 b having a longitudinal direction as a height direction is provided in the upper portion of the support column 7, and a support shaft 19 penetrating the long hole 7 b and the slide member 8 is provided in the long hole 7 b. Is slidably attached. A coil spring 10 is provided inside the column 7, and in a compressed state, the coil spring 10 has a lower end abutting against a shaft 7 c that penetrates the column 7, and a support shaft whose upper end penetrates the slide member 8. 19, and the slide member 8 is elastically biased upward.

  FIG. 6 is a sectional view taken along line BB in FIG. As shown in FIGS. 5 and 6, the cutter wheel 11 is rotatably supported between the two crotch portions of the arm portion 8 b of the slide member 8. The outer edge of the cutter wheel 11 has an acute blade shape as shown in FIG. The center axis of the cutter wheel 11 and the center axis of the workpiece having different diameters are always on the vertical plane. With this configuration, the pressing force of the cutter wheel 11 to the workpiece is accurately transmitted to the driving roller member composed of the driving roller 2 and the driven roller 3, and the workpiece slips or is driven. The roller member is prevented from falling off.

  On both sides of the arm portion 8b of the slide member 8, a substantially L-shaped arm 12 with its distal end facing downward is pivotable at a third fulcrum 43 between the distal end and the proximal end of the arm portion 8b. It is pivotally supported. The tip of the arm 12 is always urged downward by a torsion spring 13 attached to the third fulcrum 43. The tip of the arm 12 is bifurcated in the width direction of the tube cutting device, and the substantially cylindrical shape of the auxiliary cutting press formed from a flexible material such as urethane or synthetic rubber at the tip of the arm 12 A roller 14 is rotatably supported.

  As shown in FIG. 1, the cutter wheel 11 and the cutting assisting pressing roller 14 are substantially coaxial with respect to the longitudinal direction of the pipe material cutting device, but as shown in FIG. The rotation axis of the auxiliary pressing roller 14 is slightly below the rotation axis of the cutter wheel 11, and the lower end of the cutting auxiliary pressing roller 14 is slightly lower than the lower end of the cutter wheel 11. It is configured to be.

  As shown in FIG. 1, a link member 15 having a substantially U-shaped cross-section is formed on the first fulcrum 41 at the top of the slide member 8, with the opening directed toward the cutter wheel 11, and the slide member 8. Is supported by the above-described support shaft 19 so as to be able to rotate.

  A pipe-shaped handle 16 is pivotally supported at the second fulcrum 42 at the end of the link member 15 on the rack 7a side so as to be rotatable. A grip 16 a molded from a flexible material such as synthetic resin is attached to the tip of the handle 16. The shaft support portion of the handle 16 is provided with a pinion gear 16b having the second fulcrum 42 as the center of the pitch circle. The pinion gear 16 b engages with a rack 7 a provided on the column 7.

  On both sides of the handle 16 slightly on the distal end side of the handle 16 with respect to the second fulcrum 42, protrusions 16c are projected in the width direction of the pipe material cutting device. The protrusion 16c is configured to come into contact with the protrusion receiver 15a of the link member 15 when the handle 16 is pushed up and rotated.

  With this configuration, when the handle 16 is pushed up from a predetermined handle position where the projection 16c contacts the projection receiver 15a of the link member 15, the rack 7a and the pinion gear 16b are disengaged, and the slide member can be raised and lowered. . On the other hand, when the handle 16 is pushed down from a predetermined handle position, the rack 7a and the pinion gear 16b are engaged, and the slide member 8 is lowered.

  Next, the operation of the pipe cutting device of the present invention will be described. A workpiece, which is a tube material, is placed on a driving roller member composed of the driving roller 2 and the driven roller 3. When the handle 16 is pushed up and rotated, the protrusion 16 c protruding from the handle 16 comes into contact with the protrusion receiver 15 a of the link member 15. The handle 16 rotates about the second fulcrum 42 until a predetermined handle position where the protrusion 16c and the protrusion receiver 15a abut, but after the protrusion 16c and the protrusion receiver 15a abut (predetermined handle position). When the handle 16 is further pushed up, the rotation of the handle 16 around the second fulcrum 42 is suppressed, and the handle 16 rotates around the first fulcrum 41. When the handle 16 rotates about the first fulcrum 41, the pinion gear 16b provided on the handle 16 is disengaged from the rack 7a provided on the support shaft 7 (state of FIG. 7). Can be moved up and down.

  In accordance with the outer diameter of the workpiece, the slide member 8 is lowered until the tip of the cutting assisting pressing roller 14 comes into contact with the workpiece. When the handle 16 is pushed down and rotated in this state, the pinion gear 16b and the rack 7a are engaged. When the handle 16 is further pushed down and rotated, the pinion gear 16b rotates and meshes sequentially with the rack 7a, so that the slide member 8 descends and the workpiece is sandwiched between the drive roller member and the cutting assisting pressing roller 14. It becomes a state.

  In this state, the toggle switch 6 is operated, the power is turned on, and the drive roller 2 is rotated.

  When the handle 16 is further pushed down and rotated, the slide member 8 is lowered, and the cutter wheel 11 supported by the slide member 8 is also lowered. On the other hand, the cutting assisting presser roller 14 is in contact with the workpiece, and therefore cannot be lowered. The cutting assisting presser roller 14 and the arm 12 are attached to the slide member 8 around the third fulcrum 43. Rotate upward. Then, the lower end of the cutter wheel 11 protrudes relatively from the lower end of the cutting assisting pressing roller 14, and the cutter wheel 11 comes into contact with the workpiece.

  When the handle 16 is further pushed down, the cutter wheel 11 strongly presses the workpiece, the frictional force between the workpiece and the roller member increases, a strong rotational force is applied to the workpiece, and the workpiece slips. It is reliably rotated.

  In response to the cutting of the cutter wheel 11 into the workpiece, the handle 16 is pushed down to make a cut, and when the cutter wheel 11 cuts beyond the thickness of the workpiece, the cutter wheel 11 and the drive roller member The rotational force is not transmitted to the workpiece. However, since the cutting assisting presser roller 14 presses the workpiece, a strong rotational force is applied to the workpiece. As a result, the cutter wheel 11 continues to cut the workpiece beyond the wall thickness, and the workpiece is cut off when the workpiece is rotated approximately once by being pressed by the pressing assist pressing roller 14. .

  In this way, when the handle 16 is pushed down, the cutting assisting pressure roller 14 is rotated upward with respect to the slide member 8 around the third fulcrum 43, and the cutter wheel 11 is cut into the workpiece. Since the cutting assisting pressing roller 14 follows and presses the workpiece, it is possible to cut a thick workpiece, and it is possible to sufficiently cope with workpieces having different thicknesses. .

  When the tube material cutting operation is completed and the handle 16 is rotated in the upward direction, as described above, the engagement of the pinion gear 16b and the rack 7a is released, and the slide member 8 is biased upward. As shown in FIG. 5, the slide member 8 is automatically lifted up to a position where the support shaft 19 comes into contact with the upper end of the long hole 7b, and instantly returns to the return state. As described above, the operation of rotating the handle 16 in the direction of pushing up makes it instantaneously return, so even when cutting pipes having different sizes (outer diameters) for each operation, the operation is instantaneously performed after cutting. The tube can be cut simply by operating the handle 16 so as to push down the slide member 8 from this state, and the time required for continuous cutting and lowering of the tube can be greatly reduced. And productivity can be improved.

  Next, the deburring reamer will be described. A burr | flash generate | occur | produces in the cut surface of the pipe material after a cutting | disconnection. Therefore, as shown in FIGS. 3 and 4, a reamer 17 is provided on the side surface of the apparatus main body 1. The reamer 17 is a substantially conical reamer in which at least one blade is provided on a conical surface, and in the embodiment, one blade 17a is provided. A cylindrical chip cover 17b having a bottom portion is provided so as to enclose the reamer 17 to prevent the chips from scattering. As shown in FIG. 4, the reamer 17 is chucked by a shaft 23 a provided coaxially with the third gear 23 and is driven to rotate in conjunction with the drive roller 2. As described above, since the reamer 17 is chucked on the third gear 23 that drives the driving roller 2, it is not necessary to provide an electric motor for driving the reamer 17. Since the third gear 23 has a larger gear ratio than the fourth gear 24, the rotation speed of the reamer 17 is slower than the rotation speed of the gear 2.

  As shown in FIG. 4, the reamer 17 is disposed inside the apparatus main body 1 so that the tip of the reamer 17 does not protrude from the apparatus main body 1. Thus, since it comprised so that the front-end | tip of the reamer 17 might not protrude from the apparatus main body 1, the outline of the apparatus main body 1 played the role of the safety cover which protects rotation of a reamer, and is safe. Further, since the reamer 17 does not protrude from the apparatus main body 1, the reamer 17 is not caught by a foot or the like, which is safe. Further, the overall width does not increase.

  After cutting the pipe material, the deburring operation of the cut surface of the pipe material is completed simply by applying the cut surface of the pipe material to the reamer 17 in the direction of the rotation axis of the reamer 17.

  Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. The scope of the invention can be changed as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and a tube cutting tool accompanying such changes should also be understood as being included in the technical scope. I must.

It is a side view of a pipe material cutting device showing an embodiment of the invention. It is a front view of a pipe material cutting device showing an embodiment of the invention. It is a side view of the pipe material cutting device seen from the opposite side of FIG. It is a block diagram of a gear. It is sectional drawing of a handle part. It is AA sectional drawing of FIG. It is a use condition figure of a pipe material cutting device. It is a front view of the conventional pipe material cutting device. It is detail drawing of the pressurization mechanism part of the conventional pipe material cutting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Drive roller 2a Concave groove 3 Driven roller 3a Concave groove 5 Electric motor 6 Toggle switch 7 Post 7a Rack 7b Long hole 7c Shaft 8 Slide member 8a Embracing part 8b Arm part 9 First spindle 10 Coil spring 11 Cutter wheel 12 Arm 13 Torsion spring 14 Cutting assisting pressure roller 15 Link member 15a Protrusion receiver 16 Handle 16a Grip 16b Pinion gear 16c Protrusion 17 Reamer 17a Blade 17b Chip cover 19 Support shaft 21 First gear 22 Second gear 23 Third Gear 23a shaft 24 4th gear 41 1st fulcrum 42 2nd fulcrum 43 3rd fulcrum 51 device main body 52 drive roller member 53 pipe material 54 cutter wheel 55 pressing mechanism 56 strut 57 slide member 58 slide spring 59 ratchet member 59 a Ratchet claw 59b Release protrusion 61 Lever handle 62 Ratchet groove 63 Ratchet claw 64 Spring 65 Pressing roller for cutting assistance 66 Floating arm 70 Reamer

Claims (5)

  A drive roller member provided at the upper part of the apparatus main body for receiving and rotating a workpiece, a support column erected on the main body, a slide member attached to the support column so as to be movable up and down, and rotatable on the slide member In a tubular material cutting device that has a substantially disc-shaped cutter wheel attached thereto, and cuts the workpiece from the outer peripheral surface with the workpiece sandwiched between the drive roller member and the cutter wheel, the rack is provided on the support column, A link member is pivotally supported at a first fulcrum at the upper part of the slide member, and is engaged with the rack at a second fulcrum at the tip of the link side of the link member, and the second fulcrum is the center of the pitch circle. When the handle on which the pinion gear is formed is pivotally supported and the handle is pushed down from a predetermined handle position, the rack and the pinion gear are engaged, and the slide member is lowered, Pushing the handle from the home of the handle position, disengaged from the rack and the pinion gear, tube cutting apparatus, characterized in that the slide member is movable up and down.   When the handle is provided with a protrusion that contacts the link member, the handle is pushed up, and when the protrusion contacts the link member, the handle rotates about the first fulcrum, the rack and the gear disengage, and the slide member The pipe cutting apparatus according to claim 1, wherein the pipe cutting apparatus can be moved up and down.   The pipe material cutting device according to claim 2, wherein the slide member is biased upward.   The slide member is rotatably supported by an arm whose front end is biased downward, and a cutting assisting pressure roller is rotatably supported at the front end of the arm. The pipe material cutting device according to any one of the above.   A substantially conical reamer that is rotationally driven in conjunction with the drive roller and has at least one blade provided on a conical surface is disposed inside the apparatus main body so that the tip of the reamer does not protrude from the apparatus main body. The tube material cutting device according to any one of claims 1 to 4, wherein

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