JPH09277201A - Cutting machine having link mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent hindrance from developing during cutting work by a method wherein the positions of a rotary blade at the start of cutting and at the end of cutting are held horizontally irrespective of the rocking angle of the rotary blade. SOLUTION: The reference line 57 of a bracket 15 at a cut starting position (the first limit position) and that at a cut finishing position (the second limit position) are set to be nearly parallel to each other. Further, since the height H1 of a cutter cover shaft 4J from a base 5 at the first limit position and the height H2 of that at the second limit position become equal to each other, the positions of a saw blade 3 at the start of cutting and at the end of cutting can be held horizontal (a line L1). Furthermore, even when the rocking limit of the saw blade 3 to the direction indicated with the arrow 92 is lowered by an angle R3, the positions of the saw blade 3 are horizontal (a line L2). In addition, the reference line 57 is also parallel to the top surface of the base 5 and the orbit 1 of the saw blade 3 is well-balanced in the right and left directions and formed in a near straight line. And, the first limit position and the second limit position can be controlled with a backward limit stopper and a forward limit stopper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cutting machine having a link mechanism, and in particular, regardless of the swing angle of the rotary blade, the positions of the rotary blade at the start and end of cutting can be secured horizontally. The present invention relates to a cutting machine having a link mechanism that does not hinder cutting work.

[0002]

2. Description of the Related Art As a cutting machine having a link mechanism, there is a rotary circular saw device described in JP-A-4-366601. This rotary circular saw device is shown in FIG. The wood 10 is placed on the base 100, and is cut by the circular saw blade 112. The support part 1 is provided on the pivot 112 of the base 100.
02 is fixed, and a fixed link 103 is further fixed to the support portion 102. That is, the support portion 102
The positional relationship between the fixed link 103 and the fixed link 103 is immovable.

An arrow 9 is attached to the hinge 104 of the support 102.
One end of the main support link 105 is connected so as to be rotatable in the 2,93 directions. A support arm 107 is connected to the hinge portion 106 at the other end of the main support link 105 so as to be rotatable in the directions of arrows 92 and 93. This support arm 1
A circular saw blade 112 is provided at the tip of the 07, and the circular saw blade 11
2 is driven by a motor to rotate and cut the wood 10.

One end of a swing restriction link 109 is connected to the rear end of the support arm 107 via a pin 108.
A long hole 111 is formed in the swing restriction link 109, and a pin 108 is slidably inserted into the long hole 111. That is, the support arm 107 has the hinge portion 10.
6 can be swung in the range of the elongated hole 111 in the directions of arrows 92 and 93. The swing restriction link 10
The other end of 9 is rotatably connected to the hinge portion 110 of the fixed link 103.

When cutting the wood 10, the support arm 10
7 in the direction of arrow 93 centering on the hinge 106,
Cut into wood 10. Figure 1 shows the cut wood piece 10.
4A. Then, from this state, the circular saw blade 112 is moved in the direction of arrow 91 to cut the wood 10 as shown in FIG. 14B.

[0006]

The cutting machine has a circular saw blade 11 for cutting wide wood 10, for example.
There is one that can adjust the swing of 2 downward. By swinging the circular saw blade 112 downward so that the lower end of the circular saw blade 112 is located below the surface of the base 100, a wide cutting width (directions of arrows 90 and 91) can be secured.

FIG. 15 is a schematic view of the operation when the swing mechanism of the circular saw blade 112 is provided in the rotary circular saw device shown in FIG. It is assumed that a swing fulcrum 113 is provided on the support arm 107, and the circular saw blade 112 can swing around the swing fulcrum 113 in the direction of arrow 93 (FIG. 14).
The swing fulcrum 113 is not shown in FIG.

Here, the height of the circular saw blade 112 with respect to the base 100 is the same when the circular saw blade 112 is moved to the limit in the direction of arrow 90 and when it is moved to the limit in the direction of arrow 91. Is better. That is, circular saw blade 1
If the height of the cutting start and the cutting end of 12 are not in a horizontal relationship, the cutting operation may be hindered.

As shown in FIG. 16, when the height H9 of the rotary shaft of the circular saw blade 112 at the start of cutting and the height H8 of the rotary shaft of the circular saw blade 112 at the end of cutting are displaced from each other by the height H7. , For example, the rotating shaft is wood 10 near the end of cutting
May hit you. Conversely, height H8 is H9
If the height is higher than this, there is a risk that the wood 10 will have uncut residue. Therefore, as indicated by a line L8 in FIG. 16, each link length of the link mechanism is set in advance so that the heights of the cutting start and the cutting end of the circular saw blade 112 have a horizontal relationship.

By the way, as described above, the swing fulcrum 113
It is assumed that the circular saw blade 112 is swung in the direction of the arrow 93 by an angle R9 around the center. In this case, as shown in FIG. 15, there is a problem that the height of the circular saw blade 112 at the start of cutting and the height of the circular saw blade 112 at the end of cutting are displaced by a height H7. That is, as shown by the line L9 in FIG. 15, the heights of the cutting start and the cutting end of the circular saw blade 112 vary. As described above, if the height of the cutting start of the circular saw blade 112 and the height of the cutting end thereof are not in a horizontal relationship, the cutting operation may be hindered.

Therefore, the present invention is a cutting machine having a link mechanism that can secure the positions of the rotary blades at the start and end of cutting horizontally regardless of the swinging angle of the rotary blades and does not hinder the cutting work. For the purpose of providing.

[0012]

A cutting machine having a link mechanism according to a first aspect of the present invention includes a base having a base fulcrum, a link mechanism rotatably connected to the base fulcrum, a first link fulcrum of the link mechanism, and A parallel movement part that is rotatably connected to the second link fulcrum and a rotary blade for cutting the target member are rotatably held, and are connected to the parallel movement part so as to be swingable about a swing fulcrum. In the cutting machine having a link mechanism including a rotary blade holding part, the parallel moving part moves in a first direction or a second direction by rotating the link mechanism around a base fulcrum. The parallel movement part is the limit in the first direction, the first limit position, or the second limit position.
Is configured to reach a second limit position in the direction,
When a reference line passing through the first link fulcrum and the second link fulcrum is assumed in the parallel moving part, the reference line at the first limit position and the reference line at the second limit position are in a substantially parallel positional relationship, It is characterized in that the distance between the swinging fulcrum of the parallel moving part at the first limit position and the base is substantially the same as the distance between the swinging fulcrum of the parallel moving part at the second limit position and the base.

A cutting machine having a link mechanism according to a second aspect is the cutting machine having a link mechanism according to the first aspect, wherein the reference line at the first limit position is substantially parallel to the base and the second limit position. The reference line at is substantially parallel to the base.

A cutting machine having a link mechanism according to a third aspect is the cutting machine having the link mechanism according to the first aspect, wherein a first adjusting section for adjusting a first limit position of the parallel moving section,
It is characterized in that a second adjusting part for adjusting the second limit position of the parallel moving part is provided.

[0015]

In the cutting machine having the link mechanism according to the first aspect of the present invention, when the link mechanism rotates about the base fulcrum, the parallel moving part moves in the first direction or the second direction, and the parallel moving is performed. The part is configured to reach a first limit position that is a limit in the first direction, or a second limit position in the second direction.

When a reference line passing through the first link fulcrum and the second link fulcrum is assumed in the parallel moving part, the reference line at the first limit position and the reference line at the second limit position are substantially parallel to each other. There is a positional relationship. Further, the distance between the swinging fulcrum of the parallel moving part at the first limit position and the base is substantially the same as the distance between the swinging fulcrum of the parallel moving part at the second limit position and the base.

That is, it is possible to horizontally secure the positions of the rotary blades at the first limit position and the second limit position, regardless of the swing angle of the rotary blade holding portion about the swing fulcrum. Therefore, even if the swinging angle of the rotary blade holder is adjusted, the cutting operation will not be hindered.

In the cutting machine having the link mechanism according to the second aspect, the reference line at the first limit position is substantially parallel to the base, and the reference line at the second limit position is substantially parallel to the base. is there.

Therefore, when the parallel moving part is moved in the first direction or the second direction, the orbit of the rotary blade becomes a substantially straight line along the base. Therefore, the rotary blade can be efficiently moved in the first direction or the second direction.

In the cutting machine having the link mechanism according to the third aspect of the present invention, the first limit position for adjusting the first limit position of the parallel moving part is adjusted.
A second adjusting unit for adjusting the second limit position of the adjusting unit and the parallel moving unit is provided.

Therefore, the first adjusting unit and the second adjusting unit can adjust the reference line at the first limit position and the reference line at the second limit position so as to have a substantially parallel positional relationship. Further, by adjusting the first limit position and the second limit position using the first adjusting unit and the second adjusting unit, the moving range of cutting by the rotary blade is arbitrarily set according to the size of the target member. Will be possible.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

1. First Embodiment (1) Overall Configuration of Cutting Machine A first embodiment of a cutting machine having a link mechanism according to the present invention will be described with reference to FIGS. 1 to 11. 1 is a left side view of the entire cutting machine, and FIGS. 2 and 3 are right side views of the entire cutting machine.

FIG. 4A is a sectional view taken along line IIIA-IIIA shown in FIG. 1, and FIG. 4B is a sectional view taken along line IIIB-IIIB shown in FIG. FIG. 4C is a plan view of a partial cross section of the cutting machine. 5 is a rear view of the cutting machine, and FIG.
FIG. 3 is a front view of a cutting machine. 7 to 10 are left side views of the entire cutting machine, showing the operation during cutting. Further, FIG. 11 is a conceptual diagram for explaining the operation of the cutting machine.

As shown in FIGS. 1 to 3, a wood 10 as a target member is placed on the base 5. Base 5
A fence 7 is fixed to the fence 7, and the wood 10 is positioned by bringing the wood 10 into contact with the fence 7.

A turntable 6 is rotatably provided on the base 5. The turntable 6 is provided with a table handle 8, and the turntable 6 can be rotated by holding the table handle 8 to set the orientation of the saw blade 3. The position of the turntable 6 can be fixed by tightening the table handle 8.

The turntable 6 has a holder shaft 1
A holder 9 is attached via 3. The holder 9 is rotatable around the holder shaft 13. The holder 9 can be rotated by loosening the knob 14 of the holder shaft 13, and the inclination angle of the saw blade 3 can be set arbitrarily. FIG. 6 (front view) shows a state in which the saw blade 3 is angled substantially vertically with respect to the wood 10 placed on the base 5. A central space 7c is formed in the center of the fence 7, and the saw blade 3 is located here to cut the wood 10.

After loosening the knob 14 and turning the holder 9 around the holder shaft 13 in the direction of arrow 90 or 91, the knob 14 is tightened to fix the inclination angle of the holder 9. The fence 7 has a second
A recess 7b is formed as a clearance for the belt cover 22. Further, in order to secure a sufficient inclination angle of the saw blade 3 while ensuring a wide contact surface with the wood 10 on the fence 7, an inclined portion 7a is formed as a peeling portion of the saw blade 3.

As shown in FIGS. 1 to 3, the holder 9 is connected to one ends of a first link 11 and a second link 12. The first link 11 is connected to the link connecting shaft 31 so as to be rotatable in directions of arrows 92 and 93, and the second link 12 is connected to the link connecting shaft 32 as arrows 92 and 9.
It is connected so as to be rotatable in three directions. The first link 11 and the second link 12 are the link mechanism in this embodiment, and the link connecting shafts 31 and 32 are the base fulcrums.

A bracket (parallel movement part) 15 is connected to the other ends of the first link 11 and the second link 12.
The first link 11 is connected to the bracket 15 via a link connecting shaft 33 as a first link fulcrum, and the bracket 15 is rotatable about the link connecting shaft 33 in the directions of arrows 92 and 93. The second link 12 is connected to the bracket 15 via a link connecting shaft 34 as a second link fulcrum, and the bracket 15 is connected to the link connecting shaft 3 by the bracket 15.
4 can be rotated in the directions of arrows 92 and 93.

The bracket 2 is provided with the motor 2. A blade cover (rotary blade holding portion) 4 is connected to the bracket 15 so as to be swingable in the directions of arrows 92 and 93. The blade cover 4 is a blade cover shaft (swing center) 4J
While swinging about, the saw blade (rotary blade) 3 is held rotatably around the saw blade shaft 3J. FIG.
As shown in A and C, the center line of the drive shaft of the motor 2 is located so as to be included in the rotary blade plane 55 of the saw blade 3.

As shown in FIG. 4A, the motor shaft 2 of the motor 2
A bevel gear 37 is provided at the tip of the J. And
A bevel gear 38 meshes with the bevel gear 37, and the bevel gear 38 is provided on the short shaft 39.
A pulley 40 is fixed to the end of the short shaft 39.

On the other hand, as shown in FIG. 4B, a long shaft 44 is provided so as to penetrate the blade cover shaft 4J. That is, the blade cover shaft 4J and the long shaft 44 are located coaxially. A pulley 43 is fixed to one end of the long shaft 44, and a first belt is hung between the pulley 43 and the pulley 40 (not shown). The first belt cover 21 covers the first belt.
(FIG. 1) is provided. That is, the drive of the motor 2 is transmitted to the long shaft 44 via the bevel gear 37, the bevel gear 38, the short shaft 39, the pulley 40, the first belt and the pulley 43, and the like.

As shown in FIG. 4B, the long shaft 44 penetrates the blade cover shaft 4J, and a pulley 45 is fixed to the other end thereof. The pulley 4 is attached to the saw blade shaft 3J of the saw blade 3.
6 is fixed, and the second belt 42 is stretched between the pulley 45 and the pulley 46. The second belt cover 22 is provided so as to cover the second belt 42. That is, the rotation of the long shaft 44 is transmitted to the saw blade shaft 3J via the pulley 45, the second belt 42, and the pulley 46.

As described above, the drive of the motor 2 is transmitted to the saw blade shaft 3J via the long shaft 44, and the saw blade 3 rotates to rotate the wood 1
Cut off 0. Here, the long shaft 44 is provided coaxially with the blade cover shaft 4J as described above, and the blade cover 4 swings around the blade cover shaft 4J. Therefore, even if the blade cover 4 swings, the axis of the long shaft 44 and the saw blade shaft 3J
The intervals between and are the same, and the rotation can be reliably transmitted to the saw blade 3 by the second belt 42.

The blade cover 4 is provided with a duct nozzle 20, and chips of the wood 10 are discharged to the outside through the duct nozzle 20. A dust bag for accommodating chips is attached to the duct nozzle 20. As described above, since the short shaft 39, the blade cover shaft 4J, and the long shaft 44 are provided in a stepped manner up and down, the space 4S shown in FIG. 1 is formed, and the dust bag is connected to the duct nozzle 20. The space can be secured. Further, since the short shaft 39, the blade cover shaft 4J, and the long shaft 44 are provided at different levels in the vertical direction, the length of the cutting machine in the front-rear direction can be shortened.

As shown in FIGS. 1 to 3, the handle 2
A switch 24 is provided inside 3 and an operator holds the handle 23, and when the switch 24 is gripped, the motor 2 is driven and the saw blade 3 starts rotating. When the switch 24 is released, the motor 2 stops driving,
The rotation of the saw blade 3 is also stopped.

The stopper block 1 is attached to the bracket 15.
6 is provided, and the rear limit stopper (second adjusting portion) 1
8 is screwed in and penetrated. The tip of the latter limit stopper 18 contacts the boss 48 of the second link 12. Also, the stopper block 1 is attached to the bracket 15.
7 is also provided, and the front limit stopper (first adjusting part) 1
9 is screwed in and penetrated. The front end of the front limit stopper 19 comes into contact with the boss 47 (FIGS. 5 and 8) of the first link 11.

Further, the cutter cover 4 is provided with a stopper block 25.
A swing stopper 28 is screwed into and penetrates 5. The tip of the swing stopper 28 contacts the bracket 15, and the arrows 92, 9 of the blade cover 4 centering on the blade cover shaft 4J.
The swing range in three directions is restricted.

When the swing stopper 28 is loosened and the protruding length from the stopper block 25 is shortened, the swing limit of the blade cover 4 is changed accordingly, and the blade cover 4 can be rotated in a larger direction in the arrow 92 direction. . On the contrary, if the swing stopper 28 is tightened to increase the length of protrusion from the stopper block 25, the blade cover 4
Of the blade cover 4 changes, and the swinging of the blade cover 4 in the direction of the arrow 92 becomes smaller.

The swing stopper 28 is provided with double nuts 26 and 27 with the stopper block 25 interposed therebetween. The movement range of the swing stopper 28 with respect to the stopper block 25, that is, the swing range of the blade cover 4 is limited by the double nuts 26 and 27.

As shown in FIG. 2, a spring 29 is provided between the pin 36 on the bracket 15 side and the pin 35 on the blade cover 4 side. The blade cover 4 is biased in the direction of arrow 93 by the spring force of the spring 29. That is, normally, the blade cover 4 is located in a state of being pulled up in the direction of arrow 93 as shown in FIG.

The blade cover 4 is provided with a guard portion 30. By a link mechanism with the blade cover 4,
When the blade cover 4 moves in the direction of arrow 92, the guard portion 30 is housed in the blade cover 4.
FIG. 3 shows a state where the blade cover 4 is pulled up in the direction of arrow 93 and the guard portion 30 is exposed from the blade cover 4. On the other hand, FIGS. 1 and 2 show the blade cover 4
Is pushed down in the direction of the arrow 92, and the guard portion 30 is stored in the blade cover 4.

(2) Procedure for Cutting Wood 10 with Saw Blade 3 Next, the procedure for cutting the wood 10 with the saw blade 3 will be described with reference to FIGS. 7 to 10. FIG. 7 shows the initial state, in which the blade cover 4 is pulled up in the direction of arrow 93 by the spring 29 (FIG. 3).

From this state, the operator handles 2
3 and pull the blade cover 4 in the direction of arrow 94.
As a result, the first link 11 and the second link 12 rotate about the link connection shafts 31 and 32 in the arrow 92 direction, and the bracket 15 also moves in the arrow 94 direction (first direction). FIG. 8 shows a state where the bracket 15 and the blade cover 4 have moved in the direction of arrow 94, and this position is the first limit position in the direction of arrow 94. In this case, the tip of the front limit stopper 19 contacts the boss 47 of the first link 11, and the movement of the bracket 15 and the blade cover 4 in the arrow 94 direction is restricted.

From the state shown in FIG. 8, the operator grips the switch 24 and drives the motor 2 to rotate the saw blade 3. Then, the operator holds the handle 23 and swings the blade cover 4 around the blade cover shaft 4J in the direction of the arrow 92 to pull it down. In this case, as described above, the tip end of the swing stopper 28 contacts the bracket 15, and the blade cover 4 swung in the direction of the arrow 92 is positioned.

FIG. 9 shows a state in which the blade cover 4 is pulled down in the direction of arrow 92, and the saw blade 3 cuts the wood 10. At this time, as described above, the guard portion 30 is housed in the blade cover 4 by the link mechanism.

From the state shown in FIG. 9, the operator moves the blade cover 4 in the direction of arrow 95 while holding the switch 24 still in hand, and cuts the wood 10 laterally. This state is shown in FIG. In this case, as shown in FIG.
The end of the rear limit stopper 18 is the boss 48 of the second link 12.
And the movement of the bracket 15 and the blade cover 4 in the arrow 95 direction (second direction) is restricted. The state of FIG. 10 is the second limit position in the direction of arrow 95.

When the state shown in FIG. 9 is moved to the state shown in FIG. 10, the second link 12 is connected to the link connecting shaft 3
2, the first link 11 rotates about the link connecting shaft 31 in the arrow 93 direction.

The above is the operation when the saw blade 3 is moved in the directions of the arrows 94 and 95 to cut the wood 10. However, when cutting the wood 10 having a relatively narrow width, for example, from the state shown in FIG. As it is, the saw blade 3 is swung in the direction of arrow 92 and pulled down. That is, the narrow wood 10 can be cut without moving the saw blade 3 in the directions of the arrows 94 and 95.

Here, the link connecting shaft 3 is attached to the bracket 15.
3 and the reference line 57 passing through the link connecting shaft 34, the reference line 57 at the cutting start position (first limit position in the direction of arrow 94) shown in FIG. 9 and the cutting end position shown in FIG. 10 ( The reference line 57 at the second limit position in the direction of arrow 95) is set to be substantially parallel.

FIG. 11 is a conceptual diagram showing the operation of the cutting machine. Angles R11 and 21 with respect to the vertical line 60 at the first limit positions of the first link 11 and the second link 12 (see FIG. 11).
A) and the angles R12, 22 (FIG. 11B) with respect to the vertical line 60 at the second limit position are adjusted to be equal. As a result, the reference line 57 can be positioned in parallel between the first limit position and the second limit position.

Further, in this case, since the lengths of the first link 11, the second link 12, and the bracket 15 are constant,
The height H1 of the blade cover shaft 4J to the base 5 at the limit position (FIG. 11A) is equal to the height H2 of the blade cover shaft 4J to the base 5 at the second limit position (FIG. 11B).

Therefore, the position of the saw blade 3 can be secured horizontally at the start of cutting (first limit position) and the end of cutting (second limit position), and as shown in FIGS.
Is located horizontally along the line L1.

By the way, for example, a relatively wide wood 1
In order to cut 0, it is assumed that the above-mentioned swing stopper 28 is rotationally adjusted to lower the swing limit of the saw blade 3 in the direction of arrow 92 by the angle R3. Even in such a case, since the reference line 57 is located in parallel between the first limit position and the second limit position, and the height of the blade cover shaft 4J up to the base 5 is the same, the saw blade is cut at the start and the end. 3 is the same in the vertical direction, and the lower end of the saw blade 3 is line L as shown in FIGS. 11A and 11B.
Located horizontally along 2.

As described above, the positions of the saw blade 3 at the first limit position and the second limit position can be secured horizontally regardless of the swing angle of the blade cover 4 about the blade cover shaft 4J. Therefore, even when the limit of the swinging angle of the blade cover 4 is adjusted, the cutting work is not hindered.

Further, in the present embodiment, the reference lines 57 are parallel to each other at the first limit position and the second limit position, and are also parallel to the upper surface of the base 5. . FIG. 11C shows a track 61 at the lower end of the saw blade 3 from the first limit position to the second limit position. For convenience of explanation, the orbit at the lower end of the actual saw blade 3 is shown as an orbit 61 by magnifying 10 times in the vertical direction. As shown in FIG. 11C, the track 61 of the saw blade 3 is formed in a state close to a straight line without being biased in the left-right direction in a well-balanced manner.

As described above, the reference line 57 at the first limit position and the reference line 57 at the second limit position are the base 5
When the bracket 15 is moved in the directions of the arrows 94 and 95,
The orbit of the saw blade 3 is almost linear along the upper surface of the base 5. Therefore, the saw blade 3 can be efficiently moved to the arrows 94, 9
It is possible to move in 5 directions.

(3) Adjustment of movement limit of bracket 15 Next, adjustment of movement limits (first limit position, second limit position) of the bracket 15 in the directions of arrows 94 and 95 will be described.
As described above, the bracket 15 is provided with the stopper blocks 16 and 17, and the rear limit stopper 18 and the front limit stopper 19 are screwed and penetrated, respectively. The tip ends of the latter limit stopper 18 and the former limit stopper 19 are respectively the boss 48 of the second link 12 and the first link 11
It comes into contact with the boss 47.

First, when the movement limit (first limit position) of the bracket 15 in the direction of arrow 94 is adjusted, the front limit stopper 19 is rotationally adjusted. If the front limit stopper 19 is loosened and the protrusion length from the stopper block 17 is shortened, the movement limit of the bracket 15 is changed accordingly, and the bracket 15 can be moved more in the direction of arrow 94. On the contrary, when the front limit stopper 19 is tightened to increase the protruding length from the stopper block 17, the movement of the bracket 15 in the arrow 94 direction becomes small.

When adjusting the movement limit (second limit position) of the bracket 15 in the direction of the arrow 95, the rear limit stopper 18 is rotationally adjusted. If the rear end stopper 18 is loosened and the protrusion length from the stopper block 16 is shortened, the movement limit of the bracket 15 is changed accordingly, and the bracket 15 can be moved in the direction of arrow 95 to a larger extent. On the contrary, if the rear end stopper 18 is tightened to increase the protruding length from the stopper block 16, the movement of the bracket 15 in the direction of arrow 95 becomes smaller.

As described above, by adjusting the movement limit of the bracket 15 in the directions of arrows 94 and 95,
The reference line 57 at the first limit position and the reference line 57 at the second limit position can be set to be parallel to each other. Further, by adjusting the first limit position and the second limit position, it becomes possible to arbitrarily set the movement range of cutting by the saw blade 3 according to the size of the wood 10.

[0062] 2. Second Embodiment A second embodiment of a cutting machine having a link mechanism according to the present invention will be described based on FIG. FIG. 12A is a diagram showing an outline of a cutting machine at the start of cutting (first limit position) and at the end of cutting (second limit position), and FIG. 12B is a saw blade 3 and wood 10.
It is a figure which shows the positional relationship with. As shown in FIG. 12A, in the present embodiment, the reference line 57 and the second line at the first limit position
The reference line 57 at the limit position is not parallel to the upper surface of the base 5, but is positioned so as to be inclined so that the tip end thereof rises upward.

However, the reference line 57 at the first limit position
And the reference lines 57 at the second limit position are set to be parallel to each other. That is, the first link 1
Vertical line 60 at the first limit position of the first and second links 12
Are adjusted so that the angles R31, 41 with respect to and the angles R32, 42 with respect to the vertical line 60 at the second limit position are equal. This allows the reference line 57 at the first limit position and the reference line 57 at the second limit position to be positioned in parallel.

The height of the blade cover shaft 4J up to the base 5 at the first limit position is equal to the height of the blade cover shaft 4J at the second limit position up to the base 5. Therefore, the start of cutting (first limit position) and the end of cutting (second limit)
The position of the saw blade 3 can be secured horizontally with the (limit position), and the lower end of the saw blade 3 is positioned horizontally along the line L1 as shown in FIG. 12A.

Even when the swing limit of the saw blade 3 in the direction of arrow 92 is lowered by the angle R4, the reference line 57 is located in parallel between the first limit position and the second limit position, and Since the cover shaft 4J has the same height up to the base 5, the lower end of the saw blade 3 is positioned horizontally along the line L2. The rest of the configuration is similar to that of the first embodiment.

As described above, also in this embodiment, the positions of the saw blades 3 at the first limit position and the second limit position are secured horizontally regardless of the swinging angle of the blade cover 4 about the blade cover shaft 4J. can do. Therefore, even when the limit of the swinging angle of the blade cover 4 is adjusted, the cutting work is not hindered.

It should be noted that FIG. 12B shows that from the first limit position to the second limit position.
The trajectory 62 of the lower end of the saw blade 3 up to the limit position is shown. For convenience of explanation, the track of the lower end of the actual saw blade 3 is illustrated as a track 62 by magnifying 10 times in the vertical direction.

3. Third Embodiment A third embodiment of a cutting machine having a link mechanism according to the present invention will be described based on FIG. FIG. 13A is a diagram showing an outline of a cutting machine at a cutting start (first limit position) and a cutting end (second limit position), and FIG. 13B is a saw blade 3 and a wood 10.
It is a figure which shows the positional relationship with. As shown in FIG. 13A, in the present embodiment, the reference line 57 and the second line at the first limit position
The reference line 57 at the limit position is not parallel to the upper surface of the base 5 but is positioned so as to be inclined so that the tip of the reference line 57 is lowered.

However, the reference line 57 at the first limit position
And the reference lines 57 at the second limit position are set to be parallel to each other. The angles R51 and 61 with respect to the vertical line 60 at the first limit position of the first link 11 and the second link 12 and the angles R52 and 62 with respect to the vertical line 60 at the second limit position are adjusted to be equal. Accordingly, the reference line 57 at the first limit position
And the reference line 57 at the second limit position can be positioned parallel to each other.

Further, the height of the blade cover shaft 4J up to the base 5 at the first limit position is equal to the height of the blade cover shaft 4J at the second limit position up to the base 5. Therefore, the start of cutting (first limit position) and the end of cutting (second limit)
With the (limit position), the position of the saw blade 3 can be secured horizontally, and the lower end of the saw blade 3 is positioned horizontally along the line L1 as shown in FIG. 13A.

Even when the swing limit of the saw blade 3 in the direction of arrow 92 is lowered by the angle R5, the reference line 57 is located in parallel between the first limit position and the second limit position, and Since the cover shaft 4J has the same height up to the base 5, the lower end of the saw blade 3 is positioned horizontally along the line L2. The rest of the configuration is similar to that of the first embodiment.

As described above, also in this embodiment, the positions of the saw blade 3 at the first limit position and the second limit position are secured horizontally regardless of the swing angle of the blade cover 4 about the blade cover shaft 4J. can do. Therefore, even when the limit of the swinging angle of the blade cover 4 is adjusted, the cutting work is not hindered.

Incidentally, FIG. 13B shows that from the first limit position to the second limit position.
The trajectory 63 of the lower end of the saw blade 3 up to the limit position is shown. For convenience of description, the orbit at the lower end of the actual saw blade 3 is illustrated as an orbit 63 by magnifying 10 times in the vertical direction.

4. Other Embodiments The cutting machine in each of the above-described embodiments is provided with the rear limit stopper 18 and the front limit stopper 19 for adjusting the first limit position and the second limit position. However, it is also possible to adopt a configuration in which the latter limit stopper 18 and the former limit stopper 19 are not provided.

Further, in the above embodiment, the first link 11 and the second link 12 are exemplified as the link mechanism, and the bracket 15 is exemplified as the parallel moving portion. However, the link mechanism and the parallel moving part are not limited to these, and other shapes and configurations can be used. Furthermore, although the end limit stopper 18 and the front limit stopper 19 are illustrated as the first adjustment unit and the second adjustment unit, other types may be used as long as they adjust the first limit position and the second limit position of the parallel movement unit. You may employ the structure of.

[Brief description of drawings]

FIG. 1 is a first cutting machine having a link mechanism according to the present invention.
It is a left side view of the whole in the embodiment of.

FIG. 2 is a first cutting machine having a link mechanism according to the present invention.
It is a right side view of the whole in the embodiment of.

FIG. 3 is a first cutting machine having a link mechanism according to the present invention.
It is a right side view of the whole in the embodiment of.

FIG. 4 is a first cutting machine having a link mechanism according to the present invention.
FIG. 3 is a diagram showing an embodiment of the present invention, where A is IIIA-IIIA shown in FIG. 1.
2 is a sectional view taken along the line IIIB-IIIB shown in FIG. 1, and C is a plan view of a partial section of the cutting machine.

FIG. 5 is a first cutting machine having a link mechanism according to the present invention.
3 is a rear view of the embodiment of FIG.

FIG. 6 is a first cutting machine having a link mechanism according to the present invention.
It is a front view in the embodiment.

FIG. 7 is a first cutting machine having a link mechanism according to the present invention.
FIG. 4 is a left side view for explaining a cutting state of the cutting machine in the embodiment.

FIG. 8 is a first cutting machine having a link mechanism according to the present invention.
FIG. 4 is a left side view for explaining a cutting state of the cutting machine in the embodiment.

FIG. 9 is a first cutting machine having a link mechanism according to the present invention.
FIG. 4 is a left side view for explaining a cutting state of the cutting machine in the embodiment.

FIG. 10 is a left side view for explaining a cutting state of the cutting machine in the first embodiment of the cutting machine having the link mechanism according to the present invention.

FIG. 11 is a conceptual diagram for explaining the operation of the cutting machine in the first embodiment of the cutting machine having the link mechanism according to the present invention.

FIG. 12 is a conceptual diagram for explaining the operation of the cutting machine in the second embodiment of the cutting machine having the link mechanism according to the present invention.

FIG. 13 is a conceptual diagram for explaining the operation of the cutting machine in the third embodiment of the cutting machine having the link mechanism according to the present invention.

FIG. 14 is a left side view showing a conventional cutting machine.

FIG. 15 is a conceptual diagram for explaining the operation of a conventional cutting machine.

FIG. 16 is a diagram showing a positional relationship between a circular saw blade and wood.

[Explanation of symbols]

 3 ... saw blade 4 ... blade cover 4J ... blade cover shaft 5 ... base 10 ... wood 11 ... first link 12 ...・ ・ ・ ・ Second link 15 ・ ・ ・ Bracket 18 ・ ・ ・ Last stopper 19 ・ ・ ・ Last stopper 31, 32, 33, 34 ・ ・ ・ Link connecting shaft 57 ・ ・... Base line

Claims (3)

[Claims] 1. A base having a base fulcrum, a link mechanism rotatably connected to the base fulcrum, a parallel moving part rotatably connected to a first link fulcrum and a second link fulcrum of the link mechanism, A cutting machine having a link mechanism including a rotary blade holding section that holds a rotary blade for cutting a target member rotatably and is swingably connected to a parallel moving section about a swing fulcrum. The translation mechanism moves in the first direction or the second direction when the link mechanism rotates about the base fulcrum, and the translation unit moves to the first limit position, which is a limit in the first direction. Alternatively, when a reference line passing through the first link fulcrum and the second link fulcrum is assumed in the parallel movement part, the reference line at the first limit position is configured to reach the second limit position in the second direction. And in the second limit position The reference line is in a substantially parallel positional relationship, and the distance between the swing fulcrum of the parallel moving part and the base at the first limit position and the distance between the swing fulcrum of the parallel moving part and the base at the second limit position are A cutting machine having a link mechanism characterized by being almost the same. 2. A cutting machine having a link mechanism according to claim 1, wherein the reference line at the first limit position is substantially parallel to the base, and the reference line at the second limit position is substantially parallel to the base. A cutting machine having a link mechanism characterized by the following. 3. A cutting machine having a link mechanism according to claim 1, wherein a first adjusting part for adjusting a first limit position of the parallel moving part, a second adjusting part for adjusting a second limit position of the parallel moving part, A cutting machine having a link mechanism comprising: