JP2010036271A - Board cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact board cutting tool easy to be handled. <P>SOLUTION: An eccentric wheel (E) is mounted at a distal end part of a rotary shaft (5) interlocked and connected to a rotating prime mover. Two sheets of reciprocating moving plates (11) and (120) formed with oval groove holes (13) and (14) externally fitted to the eccentric wheel E are mounted on the eccentric wheel E in a state in which major axes of the oval groove holes (13) and (14) are orthogonal to each other. At an end part of the major axis side of each of the reciprocating moving plates (11) and (12), each blade plate (20) and (21) is fixed to be parallel with a rotary axial center (5) in a state orthogonal to the major axis direction of each of the oval groove holes (13) and (14). <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention is, for example, a gypsum boat used for a partition wall of a building, a steel plate, a plywood plate, a plywood, an aluminum plate, a tex, etc., a hole for mounting a switch or an outlet, a ventilation hole, a piping hole, etc. It is related with the board cutting tool for cutting construction.

As such a board cutting tool, a rotating shaft rod having a crank portion at the intermediate portion, and a plurality of loosely fitted to the crank portion of the rotating shaft rod and reciprocating in a linear direction in a plane perpendicular to the rotating shaft rod. The blade plate is arranged in parallel to the axial direction of the slide plate and the rotary shaft 保持 held on this slide plate, and the board is cut out by reciprocating the blade plate as the rotary shaft 回 転 rotates. Things have been proposed. (Patent Document 1)
Japanese Patent No. 2617895

  However, in the conventional board cutting tool described above, the tip of the rotary shaft rod that forms the crank portion at the intermediate portion is formed at the acute-pointed tip that bites the workpiece, so that it rotates during the work. Since the rotational force acts on the tool body due to the reaction when the tip of the shaft rod bites into the workpiece, that is, the reaction force during the drilling action, a twisting force acts on the blade plate. For this reason, in order to drive the blade plate, a rotational driving force is required, a rotating motor requires a large output, and the components are enlarged, so that the handling as a cutting tool becomes troublesome. was there.

  The present invention has been proposed in view of such a point, and an object thereof is to provide a board cutting tool that is small and easy to handle.

  In order to achieve the above-mentioned object, according to the present invention, an oblong slot is provided in which an eccentric ring is attached to the tip of a rotating shaft that is linked to a rotary prime mover, and the outer ring is fitted to the eccentric ring. Are attached to the eccentric wheel with the long-diameter portion of the oval slot being orthogonal to each other, and each blade plate is attached to each end of the reciprocating plate on the long-diameter side. It is characterized by being fixed so as to be parallel to the rotation axis in a state orthogonal to the major axis direction of the slot.

  The invention according to claim 2 is characterized in that the eccentric ring according to the invention according to claim 1 is formed by a radial bearing mounted in a state of being eccentric with respect to the rotational axis of the rotary shaft. A third aspect of the invention is characterized in that, in the first or second aspect of the invention, a plurality of eccentric rings are mounted on a rotating shaft.

  In the present invention, two reciprocating plates formed with an elliptical slot fitted to the eccentric ring are mounted on an eccentric ring mounted on a rotating shaft in a state where the major axis portions of the elliptical slot are orthogonal to each other. Therefore, each reciprocating plate independently reciprocates in a direction orthogonal to each other in a plane orthogonal to the rotation axis, and the end of each reciprocating plate is parallel to the rotation axis. The blade plates fixed so as to perform linear reciprocation while maintaining a state parallel to the rotation axis.

  At this time, since only the blade plate reciprocating linearly acts on the workpiece, no force for rotating the tool body is generated. As a result, the torsional force does not act on the blade plate, and the weight of the blade plate does not need to be considered for the torsional force, so that the weight can be reduced and the driving force of the blade plate can also be rotated with a small output. A prime mover can be used, and a board cutting tool that is small and easy to handle can be obtained.

  In the invention according to claim 2, in addition to the above-mentioned effects, the eccentric ring is constituted by a radial bearing, so that the contact friction between the reciprocating plate and the eccentric ring is reduced, and each reciprocating movement is performed. The blade plate fixed to the plate and the reciprocating plate can be easily reciprocated.

  Furthermore, in the invention described in claim 3, since a plurality of eccentric rings are mounted on the rotation shaft, the eccentric rings are individually operated on each reciprocating plate, so that the reciprocating movement from the eccentric rings is performed. The transmission of the operating force to the plate can be performed smoothly, and the rotation-linear movement conversion can be performed smoothly.

FIG. 1 shows an embodiment of a board cutting tool according to the present invention. FIG. 1 is an exploded perspective view of a main part, and FIG. 2 is a central longitudinal sectional view.
This board cutting tool (1) has a motor support plate (3) that supports the electric motor (2) and a housing (4) that surrounds the outer periphery of the electric motor (2). ) Is supported by the motor support plate (3) and the ceiling wall portion of the housing (4) through bearings (6) and (7) so as to be freely rotatable. One of the rotating shafts (5) of 2) protrudes from the motor support plate (3) to become an output shaft (5a).

  A connecting tube (8) is fitted and fixed to the output shaft (5a), and the shaft core of the connecting tube (8) is located slightly eccentric with respect to the shaft core of the output shaft (5a). ing. Further, two radial bearings (9) and (10) are fitted to the connecting cylinder (8), and the connecting cylinder (8) and the radial bearings (9) and (10) are respectively connected to the eccentric ring (E). Will be configured.

  The two radial bearings (9) and (10) are fitted in oval slots (13) and (14) formed in the reciprocating plates (11) and (12), respectively. The reciprocating plates (11) and (12) are arranged in a state in which the major axis directions of the oval grooves (13) and (14) are orthogonal to each other in a plane orthogonal to the axis of the output shaft (5a). As the output shaft (5a) rotates, the reciprocating plates (11) and (12) reciprocate, and their moving directions are relatively perpendicular to each other.

  At the end of each reciprocating plate (11) (12) in the major axis direction, a flat blade plate support portion (15) extending in a direction parallel to the rotating shaft (5) and the blade plate support portion (15) A blade plate holding plate (17) is formed which includes a flange portion (16) integrally formed outward at an edge portion located on the motor support plate (3) side. Then, the guide frame (18) is fixed to the motor support plate (3) in a state where the flange portion (16) of the blade plate holding plate (17) is mounted in the guide recess (19) of the guide frame (18). Thus, the reciprocating plates (11) and (12) are positioned so as to be able to reciprocate in different directions while preventing the reciprocating plates (11) and (12) from coming off the rotating shaft (5).

  Then, the blade plates (20) and (21) are mounted and fixed to the blade plate support portions (15) of the blade plate holding plates (17) of the reciprocating plates (11) and (12), respectively. As shown in FIGS. 1 and 3, the blade plates (20) and (21) are composed of a pair of wide blade plates (20) and a pair of narrow blade plates (21). In (20) and (21), a chevron straight blade is continuously formed. A pair of blade plates (20) and (21) are arranged corresponding to the blade plate support portion (15) of the blade plate holding plate (17) so that a rectangular window hole can be drilled.

  And each blade plate (20) (21) is slightly smaller than the edge protrusion amount of the angled straight blade located in the middle (about 2 mm in this embodiment). ) Largely formed. By configuring in this way, the blade tip is directly stabbed into the work piece at a total of 8 positions on both ends of each blade board (20) and 21 by simply pressing the blade plate against the work piece. It is possible to more strongly prevent rotation in the initial stage of cutting and vibration vibration in the front-rear and left-right directions.

  FIG. 4 shows another embodiment of the blade plates (20) and (21). In this embodiment, the heights of the angled straight blades formed on the blade plate are all the same. In this way, the height of the cutting edge can be pointed well and the root can be pierced directly into the work piece by simply pressing the cutting edge lightly against the work piece. Since it is a reciprocating motion, it does not cause rotation and vibration vibration (slip) in the front-rear and left-right directions.

  Reference numeral 22 in FIGS. 1 and 2 denotes a dustproof cover that covers the outer periphery of the blade plates 20 and 21. Reference numeral (23) denotes a dust suction port formed in the housing (4). The dust suction port (23) communicates with the dust cover (22), and a dust bag (not shown) is connected to the dust suction port (23). ) Is also applied to the dust bag so that the cutting powder generated by the reciprocating operation of the blade plates (20) and (21) during the operation can be removed by suction.

FIG. 5 shows the rotation angle of the rotating shaft, the behaviors of the two reciprocating plates (11) and (12), and the blade plates (20) and (21) when the two reciprocating plates (11) and (12) are combined. FIG.
When the rotation angle of the rotating shaft (5) is in the range of 0 to 90 degrees, the radial bearing (9) that constitutes the eccentric ring (E) of the reciprocating plate (11) has an oval slot (13). The reciprocating plate (11) moves to the right in the figure, but in the reciprocating plate (12), the radial bearing (10) constituting the eccentric ring (E) has an oval slot ( In contact with the wall surface of 14), the reciprocating plate (12) moves downward in the figure.

  When the rotation angle of the rotating shaft (5) is in the range of 90 to 180 degrees, the radial bearing (9) constituting the eccentric ring (E) of the reciprocating plate (11) has an oval slot (13). The reciprocating plate (11) is reversed to the left in the figure, but in the reciprocating plate (12), the radial bearing (10) constituting the eccentric ring (E) is oval. The reciprocating plate (12) contacts the wall surface of the slot (14) and continues to move downward in the figure.

  When the rotation angle of the rotating shaft (5) is in the range of 180 to 270 degrees, the reciprocating plate (11) has a radial bearing (9) that constitutes an eccentric ring (E) with an oval slot (13). The reciprocating plate (11) continues to the left in the figure, but the radial bearing (10) constituting the eccentric ring (E) is oval in the reciprocating plate (12). The reciprocating plate (12) contacts the wall surface of the groove (14) and reversely moves upward in the figure.

  When the rotation angle of the rotary shaft (5) is in the range of 270 to 360 degrees, the radial bearing (9) that constitutes the eccentric ring (E) of the reciprocating plate (11) has an oval slot (13). The reciprocating plate (11) is reversed to the right in the figure, but the radial bearing (10) constituting the eccentric ring (E) is oval in the reciprocating plate (12). The reciprocating plate (12) contacts the wall surface of the slot (14) and continues to move upward in the figure.

  In the above embodiment, the two radial bearings (9) and (10) are fitted to the connecting cylinder (8) to form the eccentric ring (E), but are fitted to the connecting cylinder (8). There may be one radial bearing.

  In the above embodiment, the radial ring is used for the eccentric ring (E). However, the rotating cylinder can be idled at a position where the central axis of rotation on the tip surface of the rotating shaft is eccentric. You may make it support and make it an eccentric ring | wheel.

  The board cutting tool according to the present invention is most suitable for an operation for opening a hole for opening a switch or an outlet, wiring, or a pipe outlet on a partition wall or an outer wall of a building.

It is a disassembled perspective view perspective view of the principal part in one Embodiment concerning this invention. It is a center longitudinal cross-sectional view of the thing of embodiment of FIG. It is a front view of a blade board. It is a front view which shows the modification of a blade plate. It is a figure which shows the behavior of two pairs of blade plates.

Explanation of symbols

  2 ... Rotary motor, 5 ... Rotating shaft, E ... Eccentric ring (9.10 ... Radial bearing), 11.12 ... Reciprocating plate, 13.14 ... Oval slot, 20.21 ... Blade plate.

Claims (3)

  An eccentric ring (E) is attached to the tip of the rotating shaft (5) linked to the rotary motor (2), and an oval slot (13) (14) that fits outside the eccentric ring (E) is provided. The two reciprocating plates (11) and (12) thus formed are mounted on the eccentric wheel (E) in a state where the major diameter portions of the oval slots (13) and (14) are orthogonal to each other, and each reciprocating plate ( 11) At the end on the long diameter side of (12), make the blade plates (20) and (21) parallel to the rotation axis in a state perpendicular to the long diameter direction of each of the oval slots (13) and (14). Board cutting tool characterized by being fixed to   The board cutting tool according to claim 1, wherein the eccentric wheel (E) is a radial bearing (9) (10) mounted in a state of being eccentric with respect to the rotation axis of the rotation shaft (5).   The board cutting tool according to claim 1 or 2, wherein a plurality of eccentric rings (E) are mounted on the rotating shaft (5).

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