JP5716366B2 - Tabletop cutting machine - Google Patents

Description

  The present invention relates to a tabletop cutting machine. In particular, the present invention relates to a tabletop cutting machine that has a circular saw portion that can swing up and down with respect to the upper surface of a base portion and has a protective cover that covers the saw blade on the circular saw portion.

  In conventional tabletop cutting machines, when the workpiece is cut at the maximum machining height or near the maximum machining height, the chips discharged in the tangential direction of the saw blade from the workpiece cutting-up section are round saw. It was conveyed to the operator side by a protective cover that had been turned to the chip discharge port side.

JP 2005-279934 A

  In the structure of the conventional tabletop cutting machine shown in FIG. 9, when the workpiece 35 is cut at the maximum machining height or near the maximum machining height, the protective cover 28 that covers the saw blade 18 cuts the circular saw portion 11. The chips that have prevented the discharge of the chips into the powder discharge port 11a and have entered the protective cover 28 are conveyed in the rotational direction 18a of the saw blade, and the chips are transferred to the operator side as indicated by the arrow 33. It will be scattered.

  This is a problem that arises particularly in a tabletop cutting machine in which the protective cover 28 is rotated inside the circular saw portion 11 (saw cover 11b).

  It is an object of the present invention to eliminate the above-mentioned conventional drawbacks, and in a tabletop cutting machine having a configuration in which the protective cover is rotated inside the circular saw portion, a processing material close to the maximum processing height or the maximum processing height is obtained. When cutting, it is to provide a tabletop cutting machine that secures a chip conveyance path to the chip discharge port, improves dust collection efficiency, and has good workability.

  The above object is supported by a base part having a base on which a workpiece can be placed and a turntable embedded in the base so as to be horizontally rotatable, a support part standing from the base part, and the support part. A cutting portion that houses a cutting blade that cuts the workpiece and a motor that rotationally drives the cutting blade, the cutting portion covering a top outer periphery of the cutting blade, and a lower outer periphery of the cutting blade And a protective cover that can be rotated while covering the outer periphery of the cutting blade with the rotation axis of the cutting blade as a fulcrum inside the saw cover, wherein the protective cover has a diameter of the cutting blade. This can be achieved by having a notch on the outside in the direction.

  With such a configuration, even if the protective cover is configured to rotate inside the saw cover, the chips can be discharged out of the protective cover, and dust collection efficiency can be improved.

  Moreover, it is preferable that the said notch is an opening which connects the outer side and the inner side of the said protective cover. Further, it is preferable that chips of the processed material are discharged from the opening to the outside of the saw cover in a state where the protective cover is rotated to the inside of the saw cover.

  With such a configuration, the chips can be reliably discharged from the opening portion to the outside of the protective cover.

  Further, it is preferable that when the chips of the workpiece are discharged from the opening to the outside of the saw cover, the chips are guided to a guide portion provided on the saw cover.

  With such a configuration, the chips discharged to the outside of the protective cover are discharged to the chip guide part, so that it is possible to suppress the chips from interfering with the cutting operation and to improve the dust collection efficiency. .

  In addition, it is preferable that the cutout portion is provided on an end portion of the protective cover on the base portion side and on the support portion side in a state where the protective cover is rotated inward of the saw cover.

  With such a configuration, when the protective cover is rotated, that is, at the time of cutting, the chips can be reliably discharged from the cutout portion without being in the way of the protective cover.

  Moreover, it is preferable to provide the protrusion part which guides a chip to the said guide part in the radial inside of the said protective cover.

  With such a configuration, since the cutting powder is guided to the guide portion side by the protruding portion, the dust collection efficiency can be improved.

  The protruding portion is provided along the cutout portion, and is on the side opposite to the cutout portion with respect to the cutout portion in a state in which the protective cover is rotated inside the saw cover. It is preferable to be provided on the radially inner side.

  With such a configuration, the dust collection efficiency can be further improved because the chips are reliably guided to the guide portion side after hitting the protruding portion.

  According to the present invention, it is possible to provide a tabletop cutting machine with improved workability and improved dust collection efficiency when cutting a workpiece that can be cut or a workpiece close to the maximum machining height.

The side view which shows one Embodiment of the tabletop cutting machine which becomes this invention. The front view of FIG. The side view which shows the state which the protection cover and the workpiece contact | abutted. The partial cross section figure when cutting the workpiece of the maximum height. AA line sectional view of Drawing 4. FIG. 5 is a partial cross-sectional view showing another embodiment of FIG. 4. BB sectional drawing of FIG. FIG. 5 is a partial cross-sectional view showing another embodiment of FIG. 4. The partial cross section figure when cutting the workpiece of the maximum height with the conventional desktop cutting machine.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, the structure of the tabletop cutting machine of this invention is demonstrated using FIG. 1, FIG. In the tabletop cutting machine, the turntable 2 is embedded in the center of the base 1 so as to be rotatable in the horizontal direction, and the upper surface 2 a of the turntable 2 is flush with the upper surface 1 a of the base 1. A processed material 35 such as wood is placed on the upper surfaces 1 a and 2 a of the base 1 and the turntable 2. In the present invention, members on which the workpiece 35 is placed (in this embodiment, the base 1 and the turntable 2) are collectively referred to as a base portion. A fence 3 that supports a side surface 35 a of the workpiece 35 is fixed to the upper surface 1 a of the base 1. At the rear end of the turntable 2, a holder 5 serving as a support portion is erected via the holder shaft 4, and the holder 5 is arranged so as to substantially coincide with the upper surface 2 a of the turntable 2. 4 is pivotally supported so that it can tilt left and right. A handle 2 </ b> A for rotating and fixing the turntable 2 with respect to the base 1 is provided at the front end of the turntable 2.

  A long hole 2 b (FIG. 2) centered on the rudder shaft 4 is formed at the rear part of the turntable 2. The clamp lever 30 is passed through the long hole 2 b, and a screw portion (not shown) formed at the tip of the clamp lever 30 is a holder 5. It is screwed into the screw hole formed on the back. When the clamp lever 30 is loosened, the holder 5 can be tilted within the range of the elongated hole 2a with the holder shaft 4 as a fulcrum. When the clamp lever 30 is tightened, the turntable 2 is tightened between the clamp lever 30 and the holder 5, and the holder 5 Is fixed at an arbitrary tilt position. The long hole 2a is formed within a range in which the holder 5 can be inclined about 45 degrees in the left-right direction.

  In the state of right-angle cutting in which the holder 5 is erected substantially perpendicular to the turntable 2, two through holes 5 c parallel to the upper surface 2 a of the turntable 2 are formed in the upper portion of the holder 5. A sliding holding member such as a bearing (not shown) is provided in the through hole 5c, and two guide bars 6 serving as sliding members arranged side by side in the left and right (left and right direction in FIG. 2) are inserted into the through hole 5c. Has been. The guide bar 6 is supported by the holder 5 by a slide holding member so as to be parallel to the upper surface 2a of the turntable 2 and slidable in the front-rear direction. A circular saw holder 7 is provided at the front end of the guide bar 6, and a support 8 for preventing the guide bar 6 from coming out of the holder 5 is provided at the rear end. A knob 9 provided on the side surface of the holder 5 fixes the sliding of the guide bar 6.

  A circular saw portion 11, which is a cutting portion, is pivotally supported above the circular saw holder 7 via a shaft 10 so as to be swingable up and down with respect to the upper surface 1 a of the base 1. Between the circular saw part holder 7 and the circular saw part 11, a spring 12 that constantly biases the circular saw part 11 upward is provided around the shaft 10. The stopper receiving portion 7a provided on the front surface of the circular saw holder 7 regulates the swing of the circular saw portion 11 to the lower limit when the stopper bolt 13 supported by the circular saw portion 11 abuts. ing.

  Stoppers 5d and 5e that serve as positioning members when tilting are provided on the front surface of the holder 5, and stopper bolts 20 that are angle adjusting members are positioned behind the upper surface of the turntable 2 so as to be positioned on the movement locus of the stoppers 5d and 5e. , 21 are screwed in the vertical direction. When the holder 5 is tilted, the stoppers 5d and 5e are engaged (contacted) with the heads of the stopper bolts 20 and 21 at a predetermined tilt angle, and the tilt position of the circular saw portion 11 is set. The stopper bolt 20 is provided so as to be engaged with the stopper 5d when the holder 5 is inclined to the position of 45 degrees to the left. Further, the stopper bolt 21 is provided so as to engage with the stopper 5e when the holder 5 is inclined to the position of 45 degrees in the right direction. Further, the turntable 2 has a through hole, and a pin 22 serving as a positioning member at a right angle is pivotally supported so as to be horizontally movable in the front-rear direction of FIG. The stopper bolt 23 is screwed in the vertical direction so as to be positioned on the movement locus of the pin 22. When the holder 5 is in the right-angle cutting position, the tip of the stopper bolt 23 and the outer diameter portion of the pin 22 are in contact with each other, thereby holding the holder 5 in the right-angle cutting position. When tilting left and right, the pin 22 is moved horizontally in the rearward direction of FIG. 1 so as not to contact the stopper bolt 23.

  The circular saw portion 11 is provided with a saw blade 18 fixed to a saw blade shaft 17 rotatably supported by a bolt 25, a first flange 26, and a second flange 27 (FIG. 5). In addition, a motor unit 16 serving as power for the saw blade 18 is connected to the upper portion of the saw blade shaft 17, and a handle 19 having a switch 31 is provided in front of the saw blade 18. Furthermore, it has the saw cover 11b which covers the upper outer periphery of the saw blade 18, and the protective cover 28 which covers the lower outer periphery. The rotational force of the motor unit 16 is transmitted to the saw blade 18 by a transmission mechanism such as a belt (not shown).

  The protective cover 28 is rotatably provided on the outer periphery of the saw blade 18 inside the saw cover 11b with the saw blade shaft 17 as a fulcrum, and is attached to the rotation direction 18a side of the saw blade 18 by a spring (not shown). It is energized. Further, when the circular saw portion 11 is swung downward, the protective cover 28 shown in FIG. 1 is connected by a link mechanism (not shown) so as to rotate counterclockwise. When the workpiece 35 is cut, depending on the height of the workpiece 35, the protective cover 28 rotated by the link mechanism abuts on the workpiece 35 and is provided on the saw cover 11 of the circular saw portion 11 as shown in FIG. The circular saw portion 11 is lowered to the lower limit position set by the stopper bolt 13 and the stopper receiving portion 7a while rotating to the side of the chip discharge port 11a that is the guided portion.

  Next, the operation | movement which cut | disconnects the workpiece 35 using the tabletop cutting machine of this invention is demonstrated.

  In the tabletop cutting machine having the above-described configuration, in order to cut the workpiece 35 at a right angle by setting the circular saw portion 11 to the vertical position, when the holder 5 is in the vertical position, the pin 22 is moved forward to move the tilt adjusting member. The tip of the stopper bolt 23 and the outer diameter portion of the pin 22 are brought into contact with each other, and the clamp lever 30 is tightened to fix the inclined position of the holder 5. When the handle 19 is gripped and the switch 31 provided on the handle 19 is pulled, the motor unit 16 is driven to rotate, and the saw blade 18 is rotated via a transmission mechanism such as a belt and a gear (not shown) and the saw blade shaft 17. To do. In this state, the handle 19 is pushed against the urging force of the spring 12 and the circular saw portion 11 is pushed down to the lower limit position of the swing to cut the workpiece 35. If the force that has pushed down the handle 19 is reduced when the cutting of the workpiece 35 is completed, the circular saw 11 is pushed upward by the spring 12 and returned to the original upper limit position. When the turntable 2 is turned to an arbitrary rotational position with respect to the base 1 and the angle is cut, the handle 2A is gripped and the turntable 2 is rotated to an arbitrary rotational position and processed by the same cutting method. The material 35 is cut.

  Next, the inclined cutting which inclines and cuts the circular saw part 11 to the left-right direction of FIG. 2 is demonstrated. The clamp lever 30 is loosened to release the fixed state of the holder 5, and the holder 5 is tilted leftward or rightward. When the holder 5 is tilted to the left, the stopper 5d comes into contact with the stopper bolt 20 and the circular saw portion 11 is positioned in a state of 45 degrees to the left. In this state, the clamp lever 30 is tightened to fix the tilt position of the holder 5. Thereafter, the workpiece 35 is cut by the cutting method described above. The stopper 5d is not only inclined until it comes into contact with the stopper bolt 20, but can also be inclined and cut at an arbitrary inclination angle. Since the scale is provided in the rear part of the holder 5, the clamp lever 30 may be tightened at a desired inclination angle.

  Further, in the case of slide cutting in which a wide workpiece is cut by right-angle cutting, angle cutting, and inclined cutting, the knob 9 is loosened after the side surface 35a of the workpiece 35 is pressed against the surface of the fence 3 and fixed. When pulled to the front side (right direction in FIG. 1) at 19, the guide bar 6, the circular saw part holder 7, and the circular saw part 11 are moved together as a unit (state of FIG. 3). After the handle 19 is pushed down to the lower limit position of the swing of the circular saw part 11 and a cut is given, slide cutting is performed while sliding the circular saw part 11 backward (to the left in FIG. 1). That is, the slide cutting can cut the workpiece 35 for the length of the guide bar 6. If the force pushed down after the cutting is weakened, the circular saw portion 11 is pushed upward by the spring 12, and the protective cover 28 is urged toward the rotational direction 18a side of the saw blade 18 (not shown). Thus, the state shown in FIG. 1 is restored.

  As described above, according to the tabletop cutting machine of the present invention, combined cutting that combines various cutting methods such as right angle cutting, angle cutting, inclined cutting, slide cutting, and angle cutting and inclined cutting is possible.

  Next, the structure of the protective cover 28 of the tabletop cutting machine according to the present invention will be described with reference to FIGS. FIG. 4 shows the position of the protective cover 28 at the time of cutting the maximum processing height that can be cut by the tabletop cutting machine or the workpiece 35 close to the maximum processing height in each cutting method described above. The protective cover 28 is configured to rotate counterclockwise by the link mechanism when the circular saw portion 11 is swung downward, but the processing material 35 close to the maximum processing height or the maximum processing height. When cutting the protective cover 38, the protective cover 38 comes into contact with the upper surface of the workpiece 35. Since the protective cover 28 is configured to rotate inside the saw cover 11b, the protective cover of the conventional tabletop cutting machine shown in FIG. 9 has a chip discharge port 11a of the circular saw portion 11 when rotated into the saw cover 11b. Therefore, the chips that have entered the protective cover 28 are conveyed in the rotation direction 18a of the saw blade, and the operator side as indicated by the arrow 33 along the protective cover 28. The swarf was scattered, and it was difficult for the swarf to be discharged to the outside through the swarf discharge port 11a.

  Therefore, the protective cover 28 of the tabletop cutting machine of the present invention is tangent to the blade edge of the saw blade 18 from the raised portion 29 of the workpiece 35 at the time of cutting so as not to obstruct the passage of the chips discharged from the workpiece 35. A cutout 28 a is provided on the outer periphery of the protective cover 28 in the direction of the chip discharge direction 32. The notch 28 a is provided on the outer periphery of the protective cover 28 located on the radial extension line of the saw blade 18. Further, the notch 28a is an opening that communicates the inside and outside of the protective cover 28, is located in the chip discharge direction 32, and is provided so as to communicate the inside of the protective cover 28 and the chip discharge port 11a. . A dust collection bag and a dust collector (not shown) are detachable from the chip discharge port 11a.

  The chips discharged from the blade edge of the saw blade 18 in a state where the protective cover 28 is rotated to the chip discharge port 11a side are conveyed in the chip discharge direction 32, passed through the notches 28a of the protective cover 28, and cut. It is discharged to the powder discharge port 11a. Here, the notch 28a is an imaginary line (a chip discharge direction 32) that connects the cut portion 29 of the workpiece 35 to the chip discharge port 11a in a state where the protective cover 28 is rotated toward the chip discharge port 11a. ) Is provided at the end of the protective cover 28 located above. That is, the notch 28a is an end portion of the protective cover 28 located on the base 1 (working material 35) side and closer to the holder 5 side than the saw blade shaft 17 in a state where the protective cover 28 is rotated into the saw cover 11b. Is provided. Accordingly, when the protective cover 28 rotates, the notch 28a is positioned on the chip discharge direction 32, and the protective cover 28 reliably cuts the chips without obstructing the passage of the chips. 11a can be discharged.

  Although the notch 28a shown in FIG.4 and FIG.5 was set as the structure provided in the edge part on the saw blade extended line of the protective cover 28 at slit shape, various structures can be considered. For example, as shown in FIGS. 6 and 7, the cutout 28a of the protective cover 28 is not a slit, but is a long hole 28b, and the chips are passed through the long hole 28b to the chip discharge port 11a of the circular saw portion 11. It can also be transported and discharged. Even in this case, if the notch 28a is positioned on the chip discharging direction 32, the protective cover 28 does not hinder the chip discharging passage.

  Further, as shown in FIG. 8, a protrusion (projection) 28 c protruding from the inner periphery toward the saw blade 18 side is provided in the vicinity of the notch 28 a or the long hole 28 b of the protection cover 28. It can also be provided. That is, by providing the convex portion 28c on the back side in the saw blade rotation direction 18a with respect to the notch 28a or the long hole 28b (on the side opposite to the notch 28a), chips into the protective cover 28 are obtained. Can be prevented and guided to the chip discharge port 11a to be discharged. The convex portion 28c is preferably provided along the portion of the notch 28a opposite to the base. According to this configuration, the chips along the chip discharging direction 32 hit the convex portion 28c to form the notch 28a or the long hole 28b. It is easy to discharge to the chip discharge port 11a. Further, when the protective cover 28 is turned to the inside of the saw cover 11b and the tip of the convex portion 28c is directed downward (on the workpiece 35 side) as shown in FIG. It is also possible to reliably discharge the smashed chips to the swarf discharge port 11a.

  1 is a base, 5 is a holder, 11 is a circular saw, 16 is a motor, 18 is a saw blade, 19 is a handle, 28 is a protective cover, 28a is a notch, 28c is a protrusion, and 35 is a workpiece. is there.

Claims (3)

A base portion having a base on which a workpiece can be placed and a turntable embedded in the base so as to be horizontally rotatable;
A support portion erected from the base portion;
A cutting part supported by the support part and containing a cutting blade for cutting the workpiece and a motor for rotationally driving the cutting blade;
The cutting portion is provided so as to be able to rotate while covering the outer periphery of the cutting blade with the saw cover covering the upper outer periphery of the cutting blade and the lower outer periphery of the cutting blade and covering the outer periphery of the cutting blade around the rotation axis of the cutting blade inside the saw cover. A tabletop cutting machine having a protected cover ,
A notch that is provided at the end of the protective cover on the base portion side and on the support portion side and communicates between the outer side and the inner side of the protective cover in a state in which the protective cover is rotated inside the saw cover. And
In a state where the protective cover is rotated to the inside of the saw cover, chips of the processed material are discharged from the notch portion to the outside of the saw cover,
When the chips of the workpiece are discharged from the opening to the outside of the saw cover, the chips are guided to a guide portion provided on the saw cover,
In processing, when the point at which the tip of the cutting blade finishes contact with the workpiece is taken as the cut-up portion, the cut-out portion is provided on a line connecting the cut-up portion and the guide portion. And tabletop cutting machine. Provided on the radially inner side of the protective cover is a protrusion that guides the chips to the guide,
The projecting portion is provided along the notch portion, and is on the side opposite to the notch portion with respect to the notch portion in a state in which the protective cover is rotated to the inside of the saw cover, and the radial direction of the protective cover The tabletop cutting machine according to claim 1, wherein the tabletop cutting machine is provided inside. A base portion having a base on which a workpiece can be placed and a turntable embedded in the base so as to be horizontally rotatable;
A support portion erected from the base portion;
A cutting part supported by the support part and containing a cutting blade for cutting the workpiece and a motor for rotationally driving the cutting blade;
The cutting portion is provided so as to be able to rotate while covering the outer periphery of the cutting blade with the saw cover covering the upper outer periphery of the cutting blade and the lower outer periphery of the cutting blade and covering the outer periphery of the cutting blade around the rotation axis of the cutting blade inside the saw cover. A tabletop cutting machine having a protected cover,
A notch that is provided at the end of the protective cover on the base portion side and on the support portion side and communicates between the outer side and the inner side of the protective cover in a state in which the protective cover is rotated inside the saw cover. And
A protrusion provided along the notch and provided on the side opposite to the notch with respect to the notch and in the radially inner side of the protection cover in a state where the protection cover is rotated inside the saw cover. And having
In a state where the protective cover is rotated to the inside of the saw cover, chips of the processed material are discharged from the notch portion to the outside of the saw cover,
A tabletop cutting machine characterized in that when the chips of the processed material are discharged from the opening to the outside of the saw cover, the chips are guided by the protrusions to a guide portion provided on the saw cover. .