JPH1142509A - Bench cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a bench cutter that infiltration is prevented of foreign matter in a positioning mechanism, in the case of particularly constituting this positioning mechanism in a plunger type, infiltration into a recessed part of the foreign matter is prevented, not only avoiding deposition of the foreign matter in the recessed part but also preventing even infiltration of the foreign matter in a plunger bore, a plunger can be smoothly moved, in this way, relating to a base, a position holding function of a turn table can be properly maintained over a long period. SOLUTION: In a bench cutter comprising a base 1, turn table 2 mounted able to turn in the base 1, and a positioning mechanism 4 for holding the turn table 2 selectively in any one of a plurality of its preset turn positions relating to the base 1, the positioning mechanism 4 is provided in a contact slide part A between the base 1 and the turn table 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a desktop cutting machine in which a turntable is rotatably mounted on a base, and a rotation position of the turntable with respect to the base is held by a positioning mechanism.

[0002]

2. Description of the Related Art Generally, a desktop cutting machine includes a base 21 and a turntable 22 rotatably mounted on the base 21 as shown in FIG.
The material to be cut placed thereon is cut by the cutting means. In this type of tabletop cutting machine, a turntable 22 is provided.
A positioning mechanism 24 is provided for selectively holding the turntable 22 at one of a plurality of preset rotational positions of the turntable 22 with respect to the base 21.

A positioning mechanism 24 of this type includes a downwardly facing plunger bore 2 formed on the lower surface of a turntable 22.
5, a ball-type plunger 26 disposed in the plunger bore 25 so as to be able to protrude and retract from the lower end of the plunger bore 25, and the plunger 26 is connected to the plunger bore 25.
A coil spring 28 as an elastic member disposed in the plunger bore 25 so as to be pushed out from the lower end of the plunger, and the distance from the rotation center of the turntable 21 to the plunger 26 is set to be a radius so that the plunger 26 can be received. And a plurality of recesses 29 provided on the upper surface of the base 21 along the circumference of the circle.

According to the positioning mechanism 24 described above, when the turntable 22 is rotated by a predetermined angle with respect to the base 21, the plunger 26 is received in one of the plurality of recesses 29, In this manner, the turntable 22 is positioned at one of a plurality of preset rotational positions of the turntable 22 with respect to the base 21.
One is selectively retained.

However, between the base 21 and the turntable 22 at the mounting portion of the plunger 26,
A gap 27 is formed in which foreign matter such as chips, sand, dust, and dust can enter. Therefore, these foreign substances may accumulate in the concave portion 29 formed in the base 21, or may be deposited in the plunger bore 25.
Or penetrate inside. When foreign matter accumulates in the recess 29 formed in the base 21, the plunger 26
, And it becomes difficult to maintain the positioning of the turntable 22 with respect to the base 21. on the other hand,
When foreign matter enters the plunger bore 25, the foreign matter restricts the movement of the plunger 26 improperly. It is possible that the rotation of the turntable 22 is impossible or extremely difficult.

In view of such circumstances, Japanese Utility Model Publication No. 5-601
No. 0 (hereinafter referred to as “prior art”) discloses a recess (that is, a stopper) 2 in a base 21 as shown in FIG.
9 communicates with the lower surface of the base 21 through the through hole 30;
A method is disclosed in which foreign matter that has entered the recess 29 is discharged below the base 21 through the through hole 30.

[0007]

However, in the prior art, foreign matter that has entered the concave portion 29 of the base 21 can be discharged to the outside to some extent through the through hole 30, but a small amount of foreign matter still remains in the concave portion 29. Survive,
This may accumulate in the recess 29. In addition, although the above-described through hole 30 has a function of discharging the foreign matter that has entered the concave portion 29 to the outside, it has a problem that foreign foreign matter is introduced into the concave portion 29. This problem is remarkable when the tabletop cutter is installed in a place where a large amount of chips are placed, and causes accumulation of foreign matter in the recess 29. Such accumulation of foreign matter in the concave portion 29 causes the above-described problem that it is difficult to maintain the positioning of the turntable 22 with respect to the base 21.

In the prior art, no fundamental measures have been taken to prevent foreign substances from entering the recess 29. Therefore, the problem that foreign matter enters the plunger bore 25 remains to be solved.

Accordingly, an object of the present invention is to prevent foreign matter from entering the positioning mechanism, and in particular, to prevent foreign matter from entering into the concave portion when the positioning mechanism is configured as the plunger type described above. Thus, not only is it possible to avoid the accumulation of foreign matter in the concave portion, but also to prevent foreign matter from entering the plunger bore, enabling the plunger to move smoothly, thereby providing the positioning and holding function of the turntable with respect to the base. An object of the present invention is to provide a tabletop cutting machine that can be properly maintained for a long period of time.

[0010]

The present invention according to claim 1 comprises a base (1), a turntable (2) rotatably mounted on the base (1), and a turntable (2). And a positioning mechanism (4) for selectively holding the turntable (2) at any one of a plurality of preset rotational positions with respect to the base (1). In the above, the positioning mechanism (4)
Are provided at a contact sliding portion (A) between the base (1) and the turntable (2).

According to a second aspect of the present invention, in the tabletop cutting machine according to the first aspect, the positioning mechanism (4) is provided on the base (1) and the turntable (2) at the contact sliding portion (A). A plunger bore (5) penetrating either one of the plunger bores (5), and arranged in the plunger bore (5) such that the plunger bore (5) can protrude and retract from one end of the plunger bore (5) on the side of the contact sliding portion (A). Plunger (6)
An adjusting mechanism (7) provided at the other end of the plunger bore (5); an elastic member (8) arranged between the adjusting mechanism (7) and the plunger (6); In order to be able to receive the plunger (6), a plurality of recesses (9a, 9b, 9c).

Hereinafter, the present invention will be described with reference to the drawings showing embodiments of the present invention. However, the present invention is not limited to the illustrated embodiment.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of a table cutting machine according to an embodiment of the present invention, FIG. 2 is a plan view showing a base and a turntable of the table cutting machine of the present invention, and FIG. III- of FIG.
FIG. 4 is a partial plan view of a base of the tabletop cutting machine of the present invention, and FIG. 5 is a cross-sectional view showing a positioning mechanism of the tabletop cutting machine of the present invention.

As is apparent from FIG. 1, the table cutting machine according to the present invention comprises a base 1, a turntable 2, and a circular saw main body 3.
It has a basic configuration consisting of

As shown in FIG. 2, the base 1 has four legs 1a, and has a circular turntable mounting portion 1b at the center thereof. A plurality of spaces 20 are formed in the turntable mounting portion 1b so as to leave the ribs 1c radially arranged.
Thereby, the desired strength is obtained and the weight of the base 1 is reduced (see FIG. 4). A fence 31 is fixed to the base 1, and the positioning of the fence 31 is performed by bringing a cut material 32 such as wood into contact with the fence 31. An angle scale 33 for displaying the angle of the turntable 2 with respect to the base 1 is provided in a part of the base 1 around the turntable mounting portion 1b (see FIG. 2).

The turntable 2 is, as shown in FIG.
A circular portion 2a mounted on a turntable mounting portion 1b (see FIG. 4) of the base 1 and rotatably mounted on the base 1 via a vertically extending support shaft 10 (see FIG. 3); And a rectangular portion 2b integrally formed at one end of the circular portion 2a. The lower end of the circular portion 2a is the turntable mounting portion 1 of the base 1.
b to form a ring-shaped contact sliding portion A (see FIG. 4). On the upper surface of the turntable 2 configured as described above, a pair of blade edge plates 18 and 18 are attached in parallel at intervals along the length direction of the rectangular portion 2b. When cutting the blade, the tip of the saw blade 19 can be inserted between the pair of blade plates 18.

A bracket 34 is rotatably mounted on a circular portion 2a of the turntable 2 at a position opposite to a side where the rectangular portion 2b is formed, via a support shaft 35 extending in the horizontal direction. (See FIG. 3). The circular saw main body 3 is attached to the bracket 34 via a pair of links 11 and 12 so as to be movable in the left-right direction in FIGS. 1 and 3, reference numeral 13 denotes
A drive unit incorporating a motor (not shown) for rotating the saw blade 19, a power transmission mechanism (not shown) for transmitting the output shaft of the motor to the saw blade 19, and the like;
14a and 14b are a first handle and a second handle provided on the circular saw main body 3, respectively.

The above-described base 1 and turntable 2
And the link 11, 12, the circular saw main body 3 is supported by the turntable 2 and the support shaft 10.
(See FIG. 3), while being rotatable along a horizontal plane around a horizontal plane, independently of the turntable 2, and further being rotatable along a vertical plane about a support shaft 35. The main body 3 can move at any position within such a rotation range along the same plane as the saw blade 19 within the range of a predetermined stroke allowed by the links 11 and 12.

Therefore, the saw blade 19 is maintained vertically, and the saw blade 19 thus maintained vertically is attached to the fence 31 such that the saw blade 19 is perpendicular to the contact surface of the cut material 32 with the fence 31. If the saw blade 19 is moved in the plane direction while maintaining the position, the material to be cut 32 can be cut straight, and the saw blade 19 is maintained vertically, and thus maintained vertically. The material 3 to be cut is placed so that the saw blade 19 is not orthogonal to the contact surface of the material 32 to be cut against the fence 31.
If the saw blade 19 is moved in the plane direction while holding the mounting position of 2, the workpiece 32 can be cut diagonally in the plane, and the saw blade 19 is inclined with respect to the vertical line. The saw blade 19, which is maintained in the inclined state, is maintained in the inclined state.
If the saw blade 19 is moved in the plane direction while maintaining the mounting position of the material to be cut 32 so as to be orthogonal to the contact surface of No. 2, the material to be cut 32 can be cut obliquely on its side surface. Further, by arbitrarily combining the above-described arrangements of the saw blade 19 and the material to be cut 32, it is possible to perform cutting in accordance with a cutting pattern according to each combination.

In the tabletop cutting machine of the present invention having the above-described basic configuration, a positioning mechanism 4 is provided at the above-mentioned ring-shaped contact sliding portion A between the base 1 and the turntable 2 (see FIG. 4). (See FIG. 3).

The positioning mechanism 4 includes a plunger bore 5 and
It comprises a plunger 6, an adjusting mechanism 7, an elastic member 8, and a plurality of recesses 9a, 9b, 9c.

That is, the plunger bore 5 vertically penetrates the turntable 2 at a position between the circular portion 2a and the rectangular portion 2b of the turntable 2 so as to reach the contact sliding portion A. It is provided. As shown in FIG. 5, a female screw portion 5a for the adjusting mechanism 7 is formed in an upper portion of the plunger bore 5.

The plunger 6 is a ball-type plunger, and is disposed in the plunger bore 5 so as to be able to protrude and retract from one end of the plunger bore 5 on the side of the contact sliding portion A.

The adjusting mechanism 7 is formed by a headless male screw having a hexagonal hole at the upper end, and is screwed to a female screw portion 5 a formed at an upper portion of the plunger bore 5. Therefore,
The adjusting mechanism 7 configured as a male screw can move up and down in the female screw part 5a by rotating itself.

The elastic member 8 is composed of a compression coil spring, is disposed between the adjusting mechanism 7 and the plunger 6, and presses the plunger 6 downward with a predetermined elastic force.

The plurality of recesses 9a, 9b, 9c are formed in the base 1 so as to face the contact sliding portion A so as to receive the plunger 6 pressed downward by the elastic member 8 as described above. Each is formed. Accordingly, the distance between the center of the opening in each of the plurality of recesses 9a, 9b, 9c and the center of the support shaft 10 is the same as each other, and this distance is equal to the center of the plunger 6 and the support shaft. Equal to the distance to the center of 10. Of the plurality of recesses described above, the recess 9a receives the plunger 6 when the turntable 2 is placed in the neutral position, and the plurality of recesses 9b allows the turntable 2 to move from the neutral position to a plurality of positions. When rotated counterclockwise in FIG. 2 at any one of the different predetermined angles, the plunger 6 is received, and the plurality of recesses 9c allow the turntable 2 to move from the neutral position to any of a plurality of different predetermined angles. It is configured to receive the plunger 6 when rotated clockwise in FIG. Of course,
Recess 9a for holding turntable 2 in neutral position
The angle between the straight line connecting the center of the opening and the center of the support shaft 10 and the straight line connecting the center of the opening and the center of the support shaft 10 in each of the other recesses 9b and 9c is set to a desired value in advance. The rotation angle of the turntable 2 is set, and is read by an angle scale 33 provided on the base 1 based on a pointer P provided on the turntable 2 (see FIG. 2).

The plurality of recesses 9a, 9b, 9c described above
Is different from the recess 29 in the prior art (see FIG. 6).
Does not have a through hole. That is, these recesses 9a, 9b,
Only the upper part of 9c is open, and the lower part is closed. Therefore, it is possible to prevent foreign matter from entering the recess through the through hole as in the prior art.

According to the positioning mechanism 4 described above, the adjusting mechanism 7 configured as a male screw can be moved up and down in the female screw portion 5a by rotating itself. Since the elastic force applied to the plunger 6 by the elastic member 8 composed of a coil spring can be adjusted, the elastic force can be set to a value desired by the operator.

The above-mentioned tabletop cutter according to the present invention has a miter lock mechanism (not shown) for fixing and releasing the turntable 2 to and from the base 1, and operates the miter lock mechanism. A miter lock handle 15 is disposed at an end of the rectangular portion 2b of the turntable 2. This miter lock handle 1
5, the turntable 2 is fixed to the base 1 so that the turntable 2 cannot be turned. On the other hand, by loosening the miter lock handle 15, the turntable 2 is fixed to the base 1 of the turntable 2. Is released, and the turntable 2 is placed in a state where it can be rotated.

The table cutting machine of the present invention tilts the circular saw main body 3 together with the links 11, 12 and the bracket 34 with respect to the turntable 2, and locks the circular saw main body 3 at a desired position (FIG. A bevel lock handle 16 for operating the bevel lock mechanism is arranged coaxially with the above-mentioned miter lock handle 15 at the end of the rectangular portion 2b of the turntable 2. By tightening the bevel lock handle 16, the circular saw main body 3 is fixed to the turntable 2 together with the links 11, 12 and the bracket 34, and the circular saw main body 3 is held at a desired inclination angle. On the other hand, by loosening the bevel lock handle 16, the fixation of the circular saw main body 3 to the turntable 2 is released, and the circular saw main body 3 is connected to the links 11, 12 and the bracket 34.
And can be tilted.

Further, the tabletop cutting machine of the present invention comprises a circular saw body 3
Is tilted with respect to the turntable 2 together with the links 11, 12 and the bracket 34 to maintain the inclination angle of the saw blade 19 at 0 °, that is, 0 ° for holding the saw blade 19 vertically. A stopper mechanism (not shown) is provided. A stopper lever 17 for operating the 0 ° inclination stopper mechanism is provided at the end of the rectangular portion 2b of the turntable 2 at the end of the miter lock handle 15 and the bevel lock. It is arranged alongside the handle 16. The tilting 0 ° stopper mechanism includes a return spring (not shown) that always acts so as to maintain the tilting angle of the saw blade 19 at 0 ° when tilting from one side of the saw blade 19 to the other side. I have. Therefore, when the saw blade 19 is tilted from one side to the other side, a tilt 0 ° stopper mechanism operates to maintain the tilt angle of the saw blade 19 at 0 °. When the stopper lever 17 is rotated in this state, the holding of the saw blade 19 at the inclination angle of 0 ° is released, and the saw blade 19 can be further tilted to the other side.

Next, a method of operating the above-described desk cutting machine of the present invention will be described below.

A first cutting is performed in which the material to be cut 32 made of rectangular parallelepiped wood is cut in a state where the turning angle of the turntable 2 is maintained at 0 ° and the inclination angle of the saw blade 19 is maintained at 0 °. The pattern will be described. First, one surface (hereinafter, referred to as “outer side surface”) of the material to be cut 32 is
, And in this state, the cut material 32 is fixed on the turntable 2 via a fixing bracket (not shown).

Next, with the inclination angle of the saw blade 19 maintained at 0 ° by a 0 ° inclination stopper mechanism (not shown), the bevel lock handle 16 is tightened, and the circular saw main body 3 is connected to the links 11 and 12. And the turntable 2 is locked via the bracket 34.

Next, the miter lock handle 15 is loosened to release the fixation of the turntable 2 to the base 1,
In this state, the turntable 2 is rotated so that the pointer P of the turntable 2 is set to 0 ° on the angle scale 33 of the base 1. At this time, the plunger 6 of the positioning mechanism 4 is received in the recess 9a formed in the base 1 at the contact sliding portion A. When the plunger 6 is received in the recess 9a in this manner, a click sound is generated, and a small impact force is transmitted to the operator, and not only the visual sensation at the angle scale 33 but also the auditory sound due to the click sound. The operator can reliably recognize that the rotation angle of the turntable 2 with respect to the base 1 is 0 ° due to the uncomfortable feeling and the tactile sensation due to the small impact force transmitted to the operator together with the click sound. In this state, the turntable 2 is locked to the base 1 by tightening the miter lock handle 15.

Next, with the circular saw main body 3 held at the uppermost position as shown in FIG. 1, the circular saw main body 3 is moved to the front side of the turntable 2, that is, to the right side in FIG. By driving a motor (not shown), the saw blade 19 is rotated, and the circular saw body 3 is pressed downward. In conjunction with the pressing operation of the circular saw main body 3, the safety cover 36 covering the exposed portion around the saw blade 19 is retracted into the casing of the circular saw main body 3, and the lower half of the saw blade 19 is closed. It is exposed, and therefore a cut is made in the front part of the material 32 to be cut. When the circular saw main body 3 is pressed downward as described above and reaches the lowermost position, the lower end portion of the saw blade 19 is inserted between the pair of blade plates 18 mounted on the turntable 2.

In the state described above, the circular saw main body 3 is moved to the rear side of the turntable 2 while being pressed downward (see FIG. 3). Thereby, the material to be cut 32 is cut straight in the vertical direction with respect to the outer side surface, in other words, the material to be cut 32 is the upper side of the outer side surface in the plane (hereinafter, “reference line”). Is cut so as to have a cut surface defined by a cutting line perpendicular to the reference line and a cutting line perpendicular to the reference line on the outer side surface.

In the bench cutter according to the above-described embodiment of the present invention, the plunger bore 5 of the positioning mechanism 4 is formed on the turntable 2 while the plurality of recesses 9 are formed.
Although a, 9b, and 9c have been described as being formed on the base 1, however, if they satisfy the condition that they are arranged so as to face the contact sliding portion A between the base 1 and the turntable 2, The plurality of recesses 9a, 9b, 9c may be formed in the turntable 2 while the plunger bore 5 is formed in the base 1.

The position at which the positioning mechanism 4 is provided is not limited to the above-described position, and the positioning mechanism 4 may be provided at any other portion as long as it is a contact sliding portion A between the base 1 and the turntable 2. You may.

The recesses 9a, 9 of the positioning mechanism 4 described above
b and 9c have been described as being provided in total of nine, but are not limited to this number, and even if eight or less,
The number may be 10 or more.

The positioning mechanism 4 includes a plunger bore 5 and
It comprises a plunger 6, an adjusting mechanism 7, an elastic member 8, and a plurality of recesses 9a, 9b, 9c. A ball-type plunger is used as the plunger 6, and a compression coil spring is used as the elastic member 8, Although it has been described that a headless male screw having a hexagonal hole is used as the adjusting mechanism 7, the present invention is not limited to these specific examples. For example, another type of plunger, such as a cylindrical plunger having a hemispherical tip, may be used as the plunger 6. Further, as the elastic member 8, an elastic block made of synthetic resin, synthetic rubber, or the like, a leaf spring, or the like may be used. As the adjusting mechanism 7, a combination of a cover detachably attached to the upper end of the plunger bore 5 and a plurality of spacers disposed between the cover and the compression coil spring 8 may be used.

Furthermore, the positioning mechanism 4 has been described as being provided with the adjusting mechanism 7 as described above and capable of adjusting the elastic force applied to the plunger 6 by the elastic member 8, but is applied to the plunger 6. When it is not necessary to adjust the elastic force, the adjusting mechanism 7 described above may be omitted.

In the tabletop cutter according to the above-described embodiment of the present invention, the circular saw main body 3 has been described as being configured to be movable within the range of the predetermined stroke permitted by the links 11 and 12. , These links 11,
Instead of 12, means for horizontally moving the circular saw body 3 may be employed. If the circular saw body 3 does not need to be movable within a predetermined stroke, the circular saw body 3 is directly and rotatably mounted on the bracket 34 without using the links 11 and 12. It is also possible.

[0044]

According to the present invention described in detail above, a base, a turntable rotatably mounted on the base, and a plurality of preset turntables of the turntable with respect to the base are provided. And a positioning mechanism for selectively holding at any one of the rotation positions, the desktop cutting machine, wherein the positioning mechanism,
Since it is provided in the contact sliding portion between the base and the turntable, it prevents intrusion of foreign matter into the positioning mechanism. To prevent intrusion into
In addition to avoiding the accumulation of foreign matter in the recess,
A tabletop cutting machine that also prevents foreign matter from entering the plunger bore, enables the plunger to move smoothly, and thus can properly maintain the function of positioning and holding the turntable with respect to the base for a long period of time. Can be provided.

The positioning mechanism can be extended and retracted from a plunger bore provided through one of the base and the turntable in the contact sliding portion and one end of the plunger bore on the contact sliding portion side. A plunger arranged in the plunger bore, an adjusting mechanism provided on the other end side of the plunger bore, an elastic member arranged between the adjusting mechanism and the plunger, and receiving the plunger. And a plurality of recesses provided on one of the base and the turntable in the contact sliding portion so that the elastic force applied to the plunger by the elastic member is adjusted by the adjusting mechanism. It can be adjusted and its elastic force can be set to a value desired by the operator.

[Brief description of the drawings]

FIG. 1 is a front view of a desk cutting machine according to an embodiment of the present invention.

FIG. 2 is a plan view showing a base and a turntable of the desk cutting machine of the present invention.

FIG. 3 shows the state of FIG. 2 with the circular saw body attached.
I-III sectional drawing.

FIG. 4 is a partial plan view of a base of the bench cutter according to the present invention.

FIG. 5 is a cross-sectional view showing a positioning mechanism of the desk cutting machine according to the present invention.

FIG. 6 is a partial cross-sectional view of a prior art tabletop cutter.

[Explanation of symbols]

 1: Base 2: Turntable 3: Circular saw body 4: Positioning mechanism 5: Plunger bore 6: Plunger 7: Adjusting mechanism 8: Elastic members 9a, 9b, 9c: Recess A: Contact sliding part

Claims (2)

[Claims] 1. A base, a turntable rotatably attached to the base, and the turntable,
A tabletop cutting machine having a positioning mechanism for selectively holding the turntable at any one of a plurality of preset rotation positions of the turntable with respect to the base, wherein the positioning mechanism includes the base and the base. A desktop cutting machine, which is provided on a sliding portion in contact with the turntable. 2. The plunger bore provided through one of the base and the turntable in the contact sliding portion, and one end of the plunger bore on the contact sliding portion side is provided. A plunger arranged in the plunger bore so that it can appear and disappear,
An adjusting mechanism provided on the other end of the plunger bore;
An elastic member disposed between the adjusting mechanism and the plunger; and a plurality of elastic members provided on one of the base and the turntable in the contact sliding portion so as to be able to receive the plunger. The tabletop cutting machine according to claim 1, comprising a recess.