JP2010089229A - Portable cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable cutting machine capable of cutting an uneven plate-like workpiece. <P>SOLUTION: The portable cutting machine comprises a guide member 10 which couples an upper part 30, a lower part 20, a lower side of the upper part 30 and an upper side of the lower part 20, and has a horizontal face 50 rectangular in a plan view for guiding a workpiece W, a disk-like lower blade 21 which is fitted in a freely rotatable manner to a fixed shaft 22 fitted parallel to the width direction of the horizontal face 50 at the lower part 20 so that an upper end 21a is projected from the upper side of the lower part 20, a disk-like upper blade 31 fixed to a first rotary shaft 32 fitted parallel to the fixed shaft 22 at the upper part 30, and a portable electric drill 2 for rotating the first rotary shaft 32. In the upper blade 31, a disk surface of its lower end 31a is arranged facing a disk surface at an upper end of the lower blade 21 so as to bite a workpiece W between the lower blade 21 and the upper blade. The upper blade 31 and the lower blade 21 have notches 31b, 21b capable of biting the workpiece W on a circumferential surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cutting machine, and more particularly to a portable cutting machine for cutting a plate-like workpiece.

  It is convenient if plate-like workpieces such as various metal plates, waterproof sheets, and sheet-like wall materials used as building materials can be used while being appropriately cut at a construction site in order to increase construction accuracy. Therefore, a portable cutting machine capable of cutting a plate-like workpiece at a construction site is provided.

  For example, Patent Document 1 discloses a machine frame having wheels and a pair of rotary cutters that are rotatably held with their blade edges meshed with each other in a state in which a workpiece can be bitten in this machine frame and with the rotation axis parallel. And a gear portion that rotates the pair of rotary cutters in the reverse rotation direction with each other, and a drive unit that transmits the rotational driving force to the gear unit is attached to the machine frame, and the machine frame or the drive unit A portable cutting machine provided with a handle is described.

  When cutting a workpiece using this cutting machine, the workpiece is placed on a guide rail having a predetermined cutting shape such as a linear shape or an arc shape, and the wheel can move along the guide rail with respect to the workpiece. Arrange the cutting machine so that. Further, the rotational driving force from the drive unit is transmitted to the pair of rotary cutters via the gear unit, thereby rotating the pair of rotary cutters in the reverse direction. And if the edge part of a workpiece | work is applied between a pair of rotary cutters and a wheel is moved along a guide rail, a pair of rotary cutter will cut | disconnect a workpiece | work according to the shape of a guide rail, interposing a workpiece | work between them. At this time, since the cut work piece warps in the vertical direction and opens in the left-right direction, the cutting machine can smoothly advance along the guide rail, thereby making the work into the guide rail. Can be cut along.

Japanese Patent Laying-Open No. 2005-118928

  The cutting machine described in Patent Document 1 can cut a flat plate-like workpiece, but has a plate-like workpiece having irregularities such as a plate-like body in which ribs for reinforcement are provided in parallel. Is difficult to cut smoothly. This is because the cut workpiece piece warps in the vertical direction or opens in the horizontal direction is restricted by the unevenness, so that the workpiece is clogged between the rotary cutters and the progress of the cutting machine is hindered. .

  An object of the present invention is to make it possible to smoothly cut a plate-shaped workpiece having projections and depressions with a portable cutting machine.

  The present invention relates to a portable cutting machine for cutting a plate-like workpiece, and this portable cutting machine joins an upper part, a lower part, and an upper lower side and a lower upper side to guide the work. The upper end protrudes from the upper side of the lower part with respect to the guide member having a rectangular horizontal surface, the handle attached to the guide member, and the fixed shaft attached to the lower part in parallel to the width direction of the horizontal surface. A disk-shaped lower blade whose center is mounted so as to be freely rotatable, a disk-shaped upper blade whose center is fixed to the rotating shaft mounted in parallel with the fixed shaft at the top, and a rotating shaft And a drive mechanism for rotating. The upper blade is arranged so that the disk surface at the lower end faces the disk surface at the upper end of the lower blade so that the workpiece can be caught between the upper blade and the upper blade, Each of the lower blades has a score on the circumferential surface.

  When this portable cutting machine is used, the upper blade is set in a rotating state by rotating the rotating shaft by a driving mechanism. Then, when the workpiece is horizontally abutted between the upper blade and the lower blade and the guide member is moved in the cutting direction of the workpiece with the handle, the workpiece is moved upward by the notch of the upper blade and the lower blade. The lower blade rotates around the fixed axis in the direction opposite to the rotation direction of the upper blade following the rotation of the upper blade. Thereby, the cutting machine can apply a driving force in the cutting direction of the workpiece and can smoothly advance in the cutting direction of the workpiece. The workpiece is smoothly cut by the upper blade and the lower blade according to the moving direction of the guide member while the cut work piece is guided by the horizontal surface of the guide member.

  In one form of the portable cutting machine according to the present invention, a first disk having a smaller diameter and a larger thickness than the lower blade, the central portion of which is attached to the fixed shaft so as to be freely rotatable so as to be adjacent to the lower blade. The second disk having a smaller diameter and a larger thickness than the upper blade, the first disk and the second disk being respectively fixed to the rotation axis so as to be adjacent to the upper blade. A part of the circumferential surface faces the circumferential surfaces of the upper blade and the lower blade with a gap.

  In the case where such a first disc and a second disc are further provided, the work piece cut by the upper blade and the lower blade is restrained from being pushed up and pushed up by the lower blade and pushed to the upper blade. Thus, the lowering is suppressed, and at the same time, the opening in the left-right direction is suppressed. Therefore, the portable cutting machine of this form can cut the workpiece more smoothly and stably.

  In the portable cutting machine of the present invention, the drive mechanism transmits, for example, the portable electric drill that can be attached to the upper part of the guide member and the rotational force of the portable electric drill provided on the upper part of the guide member to the rotating shaft. And a portable electric drill also serves as a handle.

  Since the portable workpiece cutting machine of the present invention is configured as described above, it can smoothly cut a plate-shaped workpiece having irregularities in addition to a flat plate-shaped workpiece.

  With reference to FIGS. 1 to 5, one embodiment of the portable cutting machine of the present invention will be described. In the figure, a portable cutting machine 1 is for cutting a plate-shaped workpiece W using a portable electric drill 2 as a drive device, and includes a guide member 10 to which the portable electric drill 2 can be mounted. Yes.

  The guide member 10 has a lower part 20 and an upper part 30. The lower portion 20 is a rectangular thick plate member, and the upper portion 30 is a generally triangular thick plate member whose lower side is set to have the same length as the longitudinal direction of the lower portion 20 and whose upper side is inclined. is there. The lower part 20 is arranged in an upright state with the longitudinal direction as the horizontal direction, and the upper part 30 is arranged in parallel with the upright state at a distance from the lower part 20. And the upper side of the lower part 20 and the lower side of the upper part 30 are integrally connected by a horizontal plane 50 made of a thick plate member with a gap 40 provided on one end side. The horizontal surface 50 is a rectangular shape whose planar shape extends in the longitudinal direction of the lower portion 20.

  The lower blade 21 is attached to the lower portion 20 in the gap 40. The lower blade 21 is formed in a disk shape, and a central portion is attached to the lower shaft 20 so as to be freely rotatable with respect to a fixed shaft 22 attached in parallel to the width direction of the horizontal plane 50. Further, the lower blade 21 is attached so that the upper end portion 21 a protrudes from the upper side of the lower portion 20. This protrusion amount (P in FIG. 4) is usually preferably set to 0.04 to 0.12 times the radius of the lower blade 21, and particularly preferably set to 0.05 to 0.07 times.

  As shown in FIG. 5, the lower blade 21 has notches 21 b on the circumferential surface. The notches 21b are composed of a number of grooves parallel to the axial direction.

  The upper part 30 is inclined so that the upper side descends from the gap 40 side toward the horizontal plane 50 side, and includes the upper blade 31, the gear mechanism 60, and the fixed piece 70 of the portable electric drill 2.

  The upper blade 31 is formed in a disk shape that is substantially the same diameter as the lower blade 21, and in the upper portion 30, a first rotation parallel to the fixed shaft 22 that is preferably mounted directly above the fixed shaft 22. A central portion is fixed to the shaft 32. For this reason, the upper blade 31 is rotatable with the rotation of the first rotation shaft 32.

  Here, the upper blade 31 has a small distance D between the disk surface of the lower end portion 31a and the disk surface of the upper end portion 21a of the lower blade 21 so that the workpiece W can be caught between the upper blade 31 and the lower blade 21. (FIG. 5) is provided and arranged to face each other. The position of the upper blade 31 is preferably adjusted so that the lower end portion 31 a is positioned above the upper side of the lower portion 20. Further, the interval D is usually preferably set to 0.01 to 0.3 mm.

  As shown in FIG. 5, the upper blade 31 has a notch 31b on the circumferential surface. This notch 31b consists of a number of grooves parallel to the axial direction.

  The gear mechanism 60 is provided on the back side of the mounting surface of the upper blade 31 in the upper portion 30 and mainly includes a first gear portion 61 and a second gear 62. The first gear portion 61 includes an annular gear 63 and a disk-shaped output gear 64 disposed between the annular gear 63 and the back surface of the upper portion 30. The annular gear 63 and the output gear 64 are The upper portion 30 is coaxially fixed to the second rotation shaft 65 provided in parallel with the first rotation shaft 32. An annular gear 63 meshes with an input gear 66 having a shaft 3 that can be attached to and detached from the portable electric drill 2, and the input gear 66 forms an annular gear 63 and a bevel gear. The output gear 64 is rotatable with the rotation of the annular gear 63. The second gear 62 is a disc-like gear fixed to the first rotating shaft 32 and meshes with the output gear 64.

  The fixed piece 70 is a plate-like member fixed perpendicularly to the back surface direction of the mounting surface of the upper blade 31 with respect to the inclined upper side of the upper portion 30, and is used for rotatably penetrating the shaft 3. An insertion hole 71 and a holding portion 72 of the portable electric drill 2 are provided. The holding portion 72 is a member formed in a Y-shape, and is used for stably holding the guide member 10 with respect to the portable electric drill 2 by sandwiching the handle 4 of the portable electric drill 2 with an urging force. It is.

  In the portable cutting machine 1 of this embodiment, the shaft 3 of the portable electric drill 2 is inserted into the insertion hole 71 of the fixed piece 70, and this shaft 3 is attached to the input gear 66. The guide member 10 to which the shaft 3 of the portable electric drill 2 is attached is held by the holding portion 72 with respect to the handle 4 of the portable electric drill 2.

  When the plate-shaped workpiece W is cut by the portable cutting machine 1 described above, the portable electric drill 2 is operated and the shaft 3 is rotated. As a result, the input gear 66 rotates, and this rotational force is transmitted to the output gear 64 through the annular gear 63. Then, the rotational force transmitted to the output gear 64 rotates the first rotary shaft 32 via the second gear 62 and rotates the upper blade 31 in the counterclockwise direction (arrow R direction) in FIG.

  In this state, the handle 4 of the portable electric drill 2 is held, and the guide member 10 is cut in the cutting direction of the workpiece W so that the end portion of the workpiece W is sandwiched between the upper blade 31 and the lower blade 21 as shown in FIG. Move gently (for example, in the direction of arrow M in FIG. 2). As a result, the lower blade 21 follows the rotation of the upper blade 31 and rotates in the opposite direction (that is, the clockwise direction in FIG. 2), and the workpiece W is caused by the notch 31b of the upper blade 31 and the notch 21b of the lower blade 21. It is bitten between the upper blade 31 and the lower blade 21. Then, the portable cutting machine 1 that has bitten the workpiece W in this way is given a driving force in the cutting direction by the rotating upper blade 31 and the lower blade 21, and the workpiece W is moved from the upper side by the upper blade 31. In addition, the lower blade 21 is simultaneously cut from the lower side. At this time, since the cut piece of the workpiece W is guided by sliding on the horizontal plane 50, it is difficult to prevent the guide member 10 from proceeding in a cutting direction such as a straight line or a curved line.

  The above-described portable cutting machine 1 is bent in a flat plate-like or sheet-like workpiece made of metal, resin, inorganic building material, or the like, or a plate-like workpiece having irregularities, for example, a mountain-like shape as shown in FIG. The plate-like workpiece W provided with a large number of ribs 80 arranged in parallel for the purpose of reinforcement as shown in FIG. Incidentally, the portable cutting machine 1 can cut these workpieces W in the direction in which the peaks or valleys extend or in the direction in which the ribs 80 extend, as indicated by the one-dot chain arrows in FIGS. 6 and 7.

  The above-described portable cutting machine 1 may further include a first disk 23 adjacent to the lower blade 21 and a second disk 33 adjacent to the upper blade 31 as shown in FIG. The first disc 23 is attached to the fixed shaft 22 so as to be freely rotatable so as to sandwich the lower blade 21 with the lower portion 20, and the thickness is set larger than that of the lower blade 23. In addition, a part of the circumferential surface is set to have a smaller diameter than the lower blade 21 so as to face the circumferential surface of the upper blade 31 with a gap. On the other hand, the center of the second disc 33 is fixed with respect to the first rotating shaft 32 so that the upper blade 31 is sandwiched between the upper portion 30 and the thickness is set larger than that of the upper blade 31. In addition, a part of the circumferential surface is set to have a smaller diameter than the upper blade 31 so as to face the circumferential surface of the lower blade 21 with a gap.

  When the workpiece is cut using the portable cutting machine 1 according to this modification, the workpiece is caught between the upper blade 31 and the lower blade 21 by the notch 31b of the upper blade 31 and the notch 21b of the lower blade 21. In rare cases, the upper blade 31 is simultaneously cut from the upper side and the lower blade 21 is simultaneously cut from the lower side. The work piece thus cut is brought into contact with the circumferential surface of the second disk 33 so that a downward pressing force is applied, and a force in the pushing-up direction is exerted by contacting the circumferential surface of the first disk 23. Therefore, it is effectively restrained from being pushed up by the lower blade 21 and jumping upward, and from being pushed down by the upper blade 31 and effectively lowered, and simultaneously opened in the left-right direction. Is suppressed. For this reason, according to this modification, the workpiece being cut is less likely to be clogged between the lower blade 21 and the upper blade 31, and the workpiece can be cut more smoothly and stably.

  In the portable cutting machine 1 according to the above-described embodiment, the portable electric drill 2 is mounted on the fixed piece 70 and the handle 4 is also used as the handle of the guide member 10. The present invention can be similarly implemented when a portable electric screwdriver is used instead of the drill 2.

  The portable cutting machine of the present invention can also rotate the upper blade using a dedicated motor as a drive mechanism without using a portable electric drill or portable electric screwdriver. In this case, an appropriate handle is provided on, for example, the upper portion of the guide member.

1 is an overall perspective view of a portable cutting machine according to an embodiment of the present invention. The fragmentary perspective view of the said portable cutting machine. The figure seen from the arrow III direction of FIG. The figure seen from the arrow IV direction of FIG. The elements on larger scale of FIG. The perspective view of an example of the workpiece | work which can be cut | disconnected with the said portable cutting machine. The perspective view of the other example of the workpiece | work which can be cut | disconnected with the said portable cutting machine. The figure corresponded in FIG. 4 of the modification of the said portable cutting machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable cutting machine 2 Portable electric drill 4 Handle 10 Guide member 20 Lower part 21 Lower blade 21a Upper end part 21b Notch 22 Fixed shaft 23 First disc 30 Upper part 31 Upper blade 31a Lower end part 31b Notch 32 First rotating shaft 33 First Double disc 50 Horizontal plane 60 Gear mechanism W Workpiece

Claims (3)

A portable cutting machine for cutting plate-like workpieces,
A guide member having a horizontal plane in which the planar shape for guiding the workpiece is coupled to the upper side, the lower side, and the lower side of the upper part and the upper side of the lower part;
A handle attached to the guide member;
A disc-shaped lower blade with a central portion attached so as to be freely rotatable so that an upper end protrudes from an upper side of the lower portion with respect to a fixed shaft attached in parallel with the width direction of the horizontal plane in the lower portion,
A disc-shaped upper blade having a central portion fixed to a rotating shaft attached in parallel to the fixed shaft at the upper portion;
A drive mechanism for rotating the rotating shaft,
The upper blade is arranged so that the disk surface at the lower end thereof faces the disk surface at the upper end of the lower blade so that the workpiece can be bitten between the upper blade and the lower blade,
Each of the upper blade and the lower blade has a score on the circumferential surface,
Portable cutting machine.   A first disc having a diameter smaller than that of the lower blade and having a larger thickness than the lower blade, the central portion of which is attached to the fixed shaft so as to be freely rotatable so as to be adjacent to the lower blade, and the rotary shaft so as to be adjacent to the upper blade And a second disk having a smaller diameter and a larger thickness than the upper blade, wherein the first disk and the second disk are each part of a circumferential surface. The portable cutting machine according to claim 1, wherein a gap is provided between the circumferential surfaces of the upper blade and the lower blade with a gap.   The drive mechanism includes a portable electric drill that can be attached to the upper portion, and a gear mechanism that is provided on the upper portion and transmits a rotational force of the portable electric drill to the rotating shaft. The portable cutting machine according to claim 1 or 2, wherein a portable electric drill also serves as the handle.

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