JPH06206204A - Cutting tool - Google Patents

Abstract

PURPOSE:To sharply cut an object to a specified position without leaving any remainder. CONSTITUTION:A rocking arm 1 to be driven in rocking motion is installed to a cutting blade 2. The cutting blade 2 is rocked back and forth by the rocking arm 1 and at the same time, the cutting blade 2 is moved reciprocatingly in its longer direction to cut an object 4 to be cut. When the cutting blade 2 is positioned at the front edge of its scope of rocking, the cutting blade 2 is installed to the rocking arm 1 in such a way as the longer direction of the cutting blade 2 meets at the right angles with the base 5 which is set alongside with the object 4 to be cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool used for cutting veneer boards, gypsum boards and the like, and more specifically, cutting by swinging the blade back and forth and reciprocating in the longitudinal direction of the blade. It is about tools.

[0002]

2. Description of the Related Art Conventionally, as a cutting tool of this type, for example, there is a jigsaw having an orbital function as shown in FIG. The tool 2 is attached to a rocking arm 1 which is rockingly driven, and the tool 2 is rocked back and forth and the tool 2 is vertically reciprocally driven to cut the object 4 to be cut. There is. The blade 2 may have a saw blade-shaped cutting edge 3 or may be a cutter knife.

[0003]

However, in such a conventional example, when the blade 2 is swung back and forth and the blade 2 is positioned at the front end, the blade 2 as shown in FIG.
Is inclined with respect to a direction orthogonal to the object to be cut 4 and the base 5. That is, the upper part of the blade 2 is inclined so as to go forward. For this reason, an uncut portion a is formed in the cut portion, and if the cutting portion is cut too much from the original range to be cut, the opening will not be clearly opened when the cutting is made, or there will be too much cutting marks on the object to be cut. There is a problem of leaving.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a cutting tool that can cut to a predetermined position without leaving uncut portion and can cut neatly.

[0005]

In order to achieve the above object, the cutting tool of the present invention has a tool 2 attached to a rocking arm 1 which is rockingly driven, and rocks the tool 2 in the front-back direction by the rocking arm 1. In the cutting tool that reciprocates the blade 2 in the longitudinal direction of the blade 2 to cut the workpiece 4, the base 5 that follows the workpiece 4 with the blade 2 positioned at the front end of the swing range. The blade 2 is attached to the swing arm 1 so that the longitudinal direction of the blade 2 is orthogonal to the blade 2.

Further, the blade 2 is provided with a saw blade-shaped cutting edge 3a at its front edge, and the cutting edge 3a is inclined downward with respect to the base 5 when the blade 2 is orthogonal to the base 5 (negative angle). ) It is also preferable to be characterized by having a scooping angle β. Further, it is also preferable that the scooping angle β is set to 0 ° <β <-15 °.

[0007]

According to the above construction, when the blade 2 is swung back and forth and the blade 2 is reciprocated in the longitudinal direction of the blade 2 for cutting, the blade 2 is advanced to the front end while the blade 2 is the base. 5 and the object 4 to be cut, without leaving an uncut portion in the cutting portion cut by the blade 2 (a vertical cutting surface does not cause uncut portion) and without overcutting It can cut accurately to a predetermined position as well as cleanly.

The blade 2 is provided with a saw blade-shaped cutting edge 3a on its front edge, and the cutting edge 3a is inclined downward (negative angle) with respect to the base 5 when the blade is orthogonal to the base 5. Scooping angle β
When the blade 2 is reciprocated in the longitudinal direction of the blade 2 and is cut, a force for pulling the object 4 directly above is not applied, and the blade 4 can be prevented from fluttering.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 5 and 6, a housing 6 to which a base 5 is attached has a grip portion 7 inclined with respect to the base 5 and a motor accommodating portion 8 extending parallel to the base 5. Is equipped with. A battery pack 20 is detachably attached to an end of the grip portion 7, and a power switch (trigger switch) 9 is provided at an intersection of the grip portion 7 and the motor housing portion 8.

A rotary shaft 10 is installed between both side walls of the housing 6 as shown in FIG. 7, and shaft supporting portions 10a and 10b at both ends of the rotary shaft 10 are rotatably supported by the housing 6. A driven gear 11 is integrally mounted on the rotary shaft 10, and a drive gear 12 connected to a prime mover such as a motor.
Is engaged with the driven gear 11, and the rotary shaft 10 is rotationally driven by the drive gear 12. The rotary shaft 10 is provided with an eccentric cam 13 which is eccentric to the axis of the rotary shaft 10 by a predetermined amount, and the eccentric cam 13 is rotated in an engagement hole 14 provided at the base end of the swing arm 1. Freely engaged,
The swing arm 1 can be driven by the eccentric cam 13. A vertically long slot 15 is provided in an intermediate portion between the base end and the tip of the swing arm 1, and a blade 2 is attached to the tip of the swing arm 1. Long hole 15 of swing arm 1
A swing fulcrum 16 is provided on the housing 6 at a position corresponding to, and the swing fulcrum 16 is inserted into the elongated hole 15 of the swing arm 1. The blade 2 is formed in a rectangular plate shape that is long in the vertical direction, and a large number of cutting blades 3 are provided in the vertical direction in a sawtooth shape. In the case of this embodiment, the cutting edge 3 is the first edge on the front side in the traveling direction of the blade 2.
Cutting edge 3a, a second cutting edge 3b at the rear edge, and a third cutting edge 3c at the lower edge. The blade 2 is sandwiched between the tip of the swing arm 1 and the pressing plate 17, and is attached by tightening a tightening screw 18. A blade insertion recess 23 for accommodating the thin plate-shaped blade 2 is provided at the tip of the swing arm 1, and a pair of screw holes 24 are bored at the tip of the swing arm 1. Insertion holes 25 corresponding to the screw holes 24 on both sides of the pressure plate 17 to be mounted on the swing arm 1 are drilled, the tool 2 is inserted into the tool insertion recess 23, and the pressure plate is attached to the swing arm 1 from above. 17, the tightening screw 18 is screwed into the screw hole 24 from the insertion hole 25, and the tightening screw 18 is tightened to clamp and attach the blade 2 between the swing arm 1 and the pressing plate 17. The blade 2 is formed with a long hole 26 in the longitudinal direction of the blade 2, and the boss 27 provided on the pressing plate 17 is provided with the long hole 26.
The blade 2 is guided by being inserted into the. The tip of the boss 27 is fitted in a fitting recess 28 provided in the swing arm 1. The tip of the swing arm 1 projects from the housing 6, the blade 2 is inserted into the slit 19 of the base 5, and the blade 2 is projected on the lower surface of the base 5.

When the blade 2 is attached to the tip of the swing arm 1, the blade 2 swings back and forth by the swing arm 1 so that the blade 2 is located at the front end, and the blade 2 is moved in the longitudinal direction (vertical direction). ) Is attached so as to be orthogonal to the base 5. That is, the blade 2 is attached so that the angle α with respect to the base 5 is 90 °. By the way, the conventional angle α is α ≠ 90 °, which is less than 90 °. Further, the scooping angle β of the first cutting edge 3a on the front side of the blade 2 is inclined so as to incline downward with respect to a horizontal plane parallel to the base 5 with the blade 2 positioned at the front end as shown in FIG. There is. Incidentally, the conventional scooping angle β was horizontal and the angle was zero.
The rake angle γ of the rear cutting edge 3b is inclined upward with respect to the horizontal plane. In FIG. 4, 30 is a cutting action part.

When the rotating shaft 10 is rotated, the swinging arm 1 is driven by the eccentric cam 13 so as to swing about the swinging fulcrum 16, and the blade 2 together with the swinging arm 1 is driven. Swings back and forth and reciprocates in the longitudinal direction (vertical direction) of the blade 2 (swing + vertical reciprocating movement = orbital movement), and the blade 4 cuts the workpiece 4. That is, the blade 2 operates together with the swing arm 1 in the order of (a), (b), (c), and (d) of FIG.
By driving the blade 2 in this manner, the blade tip of the blade 2 moves as shown by the arrow in FIG. 8 to swing back and forth and reciprocate vertically. Where X is the amount of vertical movement, and Y
Is the amount to reciprocate back and forth. Further, the cutting object 4 is cut by the movement of the blade 2 as described above.
As shown in FIG. 2 (b) and FIG. 2 (b), the blade 2 moves vertically to the front end (when it is cut forward), the blade 2 becomes vertical, and the cut surface of the object 4 becomes vertical, resulting in the cut. The object 4 can be accurately cut to a predetermined position without being left uncut or overcut. Further, when the blade 2 is reciprocally moved up and down to cut the object 4 to be cut, even if the blade 2 is driven so as to be pulled up, the scooping angle β is directed downward, so the blade 2 is pulled up in the direction of arrow A in FIG. The force is applied, the fluttering of the object 4 to be cut can be prevented, and the cutting operation can be easily performed.
Conventionally, since the rake angle is zero, a force for pulling up the object 4 to be cut is applied, resulting in large fluttering.

The scooping angle β in the present invention is an angle formed by the base 5 and a parallel horizontal plane when the blade 2 is positioned at the front end when swinging and is orthogonal to the base 5, and is a negative angle. Has become. The scooping angle β is an angle when acting on the object to be cut 4, and changes depending on the attachment angle of the blade 2 and the swing angle (not the angle when the blade 2 alone is viewed). FIG. 9 shows the swing locus of the apex of each saw blade of the cutting blade 3a of the cutting tool 2 for the gypsum board shown in FIGS. In FIG. 9, d is the moving direction of the blade, e is the initial contact portion of the blade, and f is the point at which the blade comes off. FIG. 10 shows the results of cutting a composite material of gypsum board and rockwool board by changing the scooping angle β.
With this, line a shows the cutting speed, line b shows the work amount, and c is the vibration. The amount of work is a length that allows one battery pack 20 to work. The scooping angle β
With a negative angle, when cutting gypsum board, rock wool board, etc., the cutting speed is increased by setting a negative angle, and has a peak around -11 °. Similarly, the work amount increased by setting a negative angle, and peaked at around -11 °. Vibration is reduced by setting a negative angle, and stabilizes at around -12 °. From this, it is understood that in the cutting tool 2 for gypsum board or the like, the scooping angle β may be set within the range of 0 ° <β <−15 °.

FIG. 11 shows a cutting tool 2 for woodworking. The front edge and the rear edge of the blade 2 are provided with saw blade-shaped cutting blades 3a and 3b that are cut in opposite directions, and a cutting blade 3c is provided at the tip of the blade 2 so as to be continuous with the cutting blade 3a. It is provided. Cutting edge 3c
A notched portion 31 that is obliquely cut is provided at the rear of the. The front cutting blade 3a and the tip cutting blade 3c are provided with a clam, and the rear cutting blade 3b is not provided with a clam. Cutting edge 3
The saw blades a, 3b and 3c are alternately inclined in opposite directions as shown in the figure. FIG. 12 shows the result of cutting the plywood by changing the scooping angle β. Line a shows cutting speed, line b shows work amount, and c is vibration. The cutting speed rises on the negative angle side and peaks at around -8 °. The amount of work rises on the negative side and peaks at around -6 °. The vibration has little fluctuation, but tends to increase near -20 °. Therefore, in the woodworking blade 2, the scooping angle β may be set to 0 ° <β <-15 ° (the cutting speed, which is an important factor in cutting, is emphasized). As a result, the scooping angle β of the cutting edge 3a of the cutting tool 2 for both plasterboard and woodworking is 0.
It is desirable to set in the range of <° <β <-15 °.

FIG. 13 shows another embodiment of the blade 2.
A long hole 26 is formed in the blade 2 along the longitudinal direction, and a boss 27 that guides the long hole 26 to the swing arm 1 to the pressing plate 17.
In the case in which the slot 26 is provided and the slot 2 can be slid along the boss 27 to adjust the protruding amount of the cutting tool 2, as shown in FIG. With the provision of, it is possible to easily perform the adjustment of the generation amount without the need to measure with a ruler or the like. Since the boss 27 passes through the long hole 26 when adjusting the protruding amount, the protruding amount can be smoothly adjusted, and there is little risk that the blade 2 is twisted and the blade tip is damaged. Further, since the boss 27 is caught in the long hole 26 of the blade 2, it is safe that the blade 2 does not come off during cutting.

[0016]

As described above, according to the present invention, the tool is mounted on the swing arm so that the longitudinal direction of the tool is orthogonal to the base along which the tool is to be cut while the tool is positioned at the front end of the swing range. Since it is attached, when cutting by swinging the tool back and forth and reciprocating the tool in the longitudinal direction of the tool, the tool is orthogonal to the base and the object to be cut in the state where the tool is advanced to the front end. Therefore, it is possible to accurately cut to a predetermined position and to cut neatly without causing an uncut portion at a cutting portion cut by a blade.

According to a second aspect of the present invention, the blade has a saw blade-shaped cutting edge on the front edge thereof, and the cutting blade faces downward with respect to the base when the blade is orthogonal to the base. Since it has an inclined (negative angle) scooping angle, when reciprocating the blade in the longitudinal direction of the blade and cutting it, the force to pull the cut object straight up is not applied, and the flap of the cut object is eliminated. It can be easily cut.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating an operation of a main part of the above.

3A is an enlarged cross-sectional view for explaining a cutting state of the same, FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A, and FIG.
6 is a cross-sectional view taken along the line CC of FIG.

4A is an enlarged view of an E portion of FIG. 3A, and FIG. 4B is an enlarged view of an F portion of FIG. 3A.

FIG. 5 is an overall perspective view of the above.

FIG. 6 is a partially cutaway front view of the above.

FIG. 7 is an exploded perspective view of a main part of the above.

FIG. 8 is an explanatory diagram illustrating an operation of the cutting edge of the above.

FIG. 9 is an explanatory diagram for explaining the movement of the cutting edge of the saw blade of the above cutting blade.

FIG. 10 is a graph showing characteristics when the scooping angle of the cutting tool for a plaster board of the same is changed.

FIG. 11 is a cross-sectional view showing a state of cutting with the above woodworking blade.

FIG. 12 is a graph showing characteristics when the scooping angle of the above woodworking blade is changed.

FIG. 13 is a front view of another embodiment of the same blade.

FIG. 14 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 1 swing arm 2 blade 3a cutting edge 4 object to be cut 5 base

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Hongo 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (3)

[Claims] 1. A cutting tool is attached to a swinging arm that is driven to swing, and the swinging arm swings the tool in the front-rear direction and reciprocates the tool in the longitudinal direction of the tool to cut an object to be cut. In the cutting tool, the cutting tool is attached to the swing arm so that the longitudinal direction of the cutting tool is orthogonal to the base along which the cutting tool is located in the front end of the swing range. Cutting tool. 2. The blade comprises a saw blade at the front edge thereof, and the blade has a rake angle (negative angle) inclined downward with respect to the base when the blade is orthogonal to the base. The cutting tool according to claim 1, wherein: 3. The cutting tool according to claim 1, wherein the scooping angle β is set to 0 ° <β <-15 °.