JP2014042988A - Cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting machine capable of adjusting a cutting angle and increasing capacity of a dust box.SOLUTION: A dust box 70 is rotatably connected to a saw cover 60. The connection is performed so that the dust box 70 is fitted to an outer periphery of a cylindrical connection section 61 in the saw cover 60 and the dust box 70 is rotatable around the connection section 61 using a cylindrical cover member formed on the dust box 70 side. Therefore, the connection section 61 (opening 62) becomes a rotary shaft (dust box rotary shaft) of the dust box 70. A space capable of storing chips is formed in the dust box 70. A portion to be formed into a chamfered shape on a bottom surface of the dust box 70 can be locally provided on a right side in Fig. 1 by rotatably providing the dust box 70 with respect to the saw cover 60.

Description

  The present invention relates to a structure of a cutting machine in which a rotary blade is fixed to a base, and the lower surface of the base is brought into contact with the sample to be cut to cut the sample to be cut.

  In order to cut wood, for example, wood board, a hand-held small cutting machine is used. In such a cutting machine, a motor (driving unit) that rotates a rotary blade (circular saw blade) is fixed to the upper surface side of the base, and the circular saw blade partially protrudes from the lower surface of the base. The user can perform the cutting operation by bringing the lower surface of the base into contact with the sample to be cut (for example, a wooden board) and moving the cutting machine or the sample to be cut.

  At this time, the cutting depth in the sample to be cut is determined by the protruding amount of the circular saw blade from the lower surface of the base, and the protruding amount can be adjusted. For this purpose, the drive unit is configured to rotate (first rotation) about the rotation axis (first rotation axis) on the upper surface side of the base, and the protruding amount of the circular saw blade is desired. After the operator adjusts the rotation angle so as to be a value, the drive unit is fixed to the base. In general, a circular saw blade is normally brought into contact with the upper surface of the sample to be cut, and the sample to be cut is often cut perpendicularly from the upper surface (the cutting angle is vertical). It may be necessary to cut the sample to be cut at an angle deviating from the angle. In order to cope with such a case, the drive unit can also rotate in a direction perpendicular to the first rotation direction (the angle formed by the surface constituting the circular saw blade and the surface of the sample to be cut can be changed). (Rotation: second rotation). That is, the cutting depth and the cutting angle can be adjusted by rotating the drive unit and the circular saw blade rotated by the driving unit by such two types of rotation.

  In addition, in a region where the circular saw blade does not come into contact with the sample to be cut, a saw cover is also fixedly installed on the drive unit so as to prevent the operator from being scattered and chips. Although the scattering of the chips is suppressed to some extent by the saw cover, in order to accommodate the chips, a dust box is often used as described in Patent Document 1, for example. The dust box is fixed to the saw cover, and the inside of the dust box is connected to a space covered with the saw cover through an opening provided in the saw cover. By providing the opening on the downstream side of the cutting portion and outside the circular saw blade when the circular saw blade moves, the dust box can efficiently store chips.

JP 2011-68073 A

  Here, in the case where the second rotation is made so that the cutting angle can be adjusted, especially when the drive unit is greatly inclined to the side where the dust box is attached, the lower surface side of the dust box is the upper surface of the base. May come into contact. For this reason, when a dust box is used, the cutting angle is greatly limited. Alternatively, correspondingly, the lower surface side of the dust box can be prevented from contacting the upper surface of the base by making the lower surface side of the dust box not contact the upper surface of the base. However, in this case, the capacity inside the dust box (capacity that can accommodate chips) is reduced.

  That is, it has been difficult to obtain a cutting machine in which the cutting angle can be adjusted and the capacity of the dust box is increased.

  The present invention has been made in view of such problems, and an object thereof is to provide an invention that solves the above problems.

In order to solve the above problems, the present invention has the following configurations.
In the cutting machine according to the present invention, on the upper surface of the base, the drive unit that drives the rotation shaft to which the rotary blade is fixed can perform a first rotation and a second rotation whose rotation directions are different from each other. The amount of protrusion of the rotary blade partially protruding from the lower surface of the base is adjusted by the first rotation, and the inclination angle of the rotary blade with respect to the base is adjusted by the second rotation. A cutting machine having a configuration in which the rotating blade is covered on the upper surface side of the base, and is covered with the saw cover via a saw cover fixed to the driving unit and an opening provided in the saw cover. The space and the inside are spatially coupled, and are rotatable with respect to the saw cover about the dust box rotation axis, and the saw is located on the opposite side of the drive unit from the saw cover. Characterized by comprising a dust box which is connected to the cover, a.
In the cutting machine according to the present invention, the dust box rotation shaft is configured to exist in the opening.
In the cutting machine of the present invention, the rotation direction of the rotary blade is a first rotation in which the direction in which the outer periphery of the rotary blade on the lower side moves during rotation is the rotation shaft in the first rotation from the rotation shaft. It is set so that it may become the direction which goes to a moving shaft, The said opening part and the said dust box rotation axis | shaft were provided in the side with the said 1st rotation axis | shaft rather than the said rotation axis, It is characterized by the above-mentioned.
In the cutting machine according to the present invention, an end of the lower portion of the dust box on the side away from the saw cover has a chamfered shape.
The cutting machine of the present invention is characterized in that, in the dust box, the chamfered shape is formed only in a region closer to the first rotation shaft than the rotation shaft.
In the cutting machine according to the present invention, the dust box may be located on the upper side or the lower side with reference to the lower end of the rotational position of the dust box when the amount of protrusion of the rotary blade from the lower surface of the base is adjusted to be maximum. Further, it is also possible to rotate.

  Since this invention is comprised as mentioned above, the cutting angle can be adjusted and the cutting machine which enlarged the capacity | capacitance of the dust box can be obtained.

It is a side view which shows the structure of the cutting machine used as embodiment of this invention. It is sectional drawing of the cutting machine used as embodiment of this invention. It is a side view (a) of a dust box used in a cutting machine used as an embodiment of the present invention, and sectional views (b) and (c) in two different directions. It is sectional drawing which shows the form at the time of making a rotary blade incline in the cutting machine used as embodiment of this invention. It is a side view which shows the structure of an example of the conventional cutting machine. It is sectional drawing of an example of the conventional cutting machine. It is a side view (a) of a dust box used in an example of the conventional cutting machine, and sectional views (b) and (c) in two different directions. It is sectional drawing which shows the form at the time of making a rotary blade incline in an example of the conventional cutting machine. It is a side view which shows the structure at the time of adjusting the cutting depth shallowly in the cutting machine used as embodiment of this invention. It is a side view which shows the form at the time of performing the attachment or detachment operation | work of a rotary blade in the cutting machine used as embodiment of this invention. It is sectional drawing which shows the form at the time of performing the attachment or detachment operation | work of a rotary blade in the cutting machine used as embodiment of this invention. In the structure of an example of the conventional cutting machine, it is a side view which shows the form at the time of removing a dust box in order to perform the attachment or detachment operation | work of a rotary blade. It is a side view which shows the structure of another example of the conventional cutting machine. It is sectional drawing which shows the structure of another example of the conventional cutting machine. It is a side view (a) of a dust box used in other examples of the conventional cutting machine, and sectional views (b) and (c) in two different directions.

  Hereinafter, a cutting machine according to an embodiment of the present invention will be described. In this cutting machine, a drive unit that rotates a rotary blade (round saw blade) is used, and this drive unit is fixed on the base. The sample to be cut is placed on the lower surface side of the base, and is cut by a rotary blade protruding from the lower surface of the base. However, the drive unit is configured to be able to rotate (first rotation and second rotation) in two different directions on the base, and by the first rotation, the protrusion of the rotary blade tool from the lower surface of the base. The amount is adjusted, and the angle (cutting angle) between the rotary blade and the upper surface of the sample to be cut can be adjusted by the second rotation. In addition, a saw cover that covers the rotary blade, and a dust box that is attached to the saw cover and accommodates chips are also used.

  FIG. 1 is a side view showing the configuration of the cutting machine 10, and FIG. 2 is a cross-sectional view in the AA direction (vertical direction). Here, the side view (FIG. 1) is a view seen from the side where the dust box is provided in a direction perpendicular to the rotary blade (a direction along the rotation axis). In this cutting machine 10, the drive unit 30 is installed on the upper surface side of the base 20, the rotary blade 50 is rotated by the drive unit 30, and the sample 100 to be cut installed on the lower surface side of the base 20 is cut. Is done. The state shown in FIG. 1 corresponds to a state where the cutting depth in the cutting machine 10 is maximized.

  As shown in FIG. 2, in the drive unit 30, a motor 31 is built in a motor housing 32. The rotation output of the motor 31 is obtained by the motor output shaft 35 rotatably supported by the bearings 33 and 34 fixed to the motor housing 32. A cooling fan 36 is attached to the motor output shaft 35, and the motor 31 is air-cooled during rotation. Further, a pinion gear 37 is fixed to the left end of the motor output shaft 35 inside the gear case 41 fixed to the motor housing 32 on the left side of the motor housing 32 in FIG. 40 side.

  In the rotational drive transmission mechanism 40 in the gear case 41, the rotational motion is transmitted to the rotary shaft 43 to which the gear 42 is fixed via the pinion gear 37. The rotating shaft 43 and the motor output shaft 35 are set not to be on the same straight line. At this time, the reduction ratio in the rotation drive transmission mechanism 40 is set so that the rotation speed of the rotation shaft 43 is reduced to a rotation speed suitable for cutting.

  On the left side of the rotary shaft 43 in FIG. 2, a rotary blade 50 having a disk shape and having a blade attached to the outer peripheral portion thereof is detachably fixed (in the drawing, the description of the blade is omitted). Therefore, the rotary blade 50 is positioned and supported by the flange 44 fixed to the rotary shaft 43, and the flange 45 is fixed from the left side of the rotary blade 50 in FIG. Thus, the rotary blade 50 is fixed to the rotary shaft 43. The rotary blade 50 (rotary shaft 43) is set to rotate counterclockwise in FIG. 1 during cutting. The rotary blade 50 projects downward from the lower surface of the base 20. As a result, as shown in FIG. 1, the rotary blade 50 abuts on the sample 100 under the base 20, and the rotary blade 50 (cutting machine 10) moves from the left side to the right side in FIG. The cutting is done.

  The saw cover 60 is fixed and installed on the gear case 41 (drive unit 30) so as to cover the rotary blade 50 on the upper side of the base 20 in FIG. Thereby, when cutting the to-be-cut | disconnected sample 100, it is suppressed that chips are scattered on the upper side. A cylindrical connecting portion 61 is connected to the saw cover 60, and the inside of the cylindrical shape is an opening 62 connected to the inside covered with the saw cover 60. The connection part 61 (opening part 62) is provided on the outer side of the rotary blade 50 and the right side in FIG. Thereby, the probability that the chips generated on the lower side of the base 20 reach the opening 62 is increased. In order to facilitate attachment / detachment of the rotary blade 50, the saw cover 60 has a shape that does not cover the flange 45 and the fastening member 46. In FIG. 2, the dust box 70 is connected to the saw cover 60 on the side opposite to the gear case 41 (driving unit 30) when viewed from the saw cover 60. For this reason, in FIG. 1, the drive unit 30 and the saw cover 60 are hidden in the dust box 70.

  On the other hand, a protective cover 63 is installed below the base 20 so as to cover the outer peripheral portion of the rotary blade 50. However, the right end region below the base 20 of the rotary blade 50 is set not to be covered by the protective cover 63, and the sample 100 is cut in this region. The protective cover 63 is installed on the inner surface of the saw cover 60 so as to be rotatable about the rotation shaft 43. At this time, the protective cover 63 is provided with a spring (not shown) so that a repulsive force acts counterclockwise in FIG. 1 about the rotation shaft 43 (the same direction as the rotation direction of the rotation shaft 43). . The base 20 is formed with a rectangular long hole through which the rotary blade 50 and the protective cover 63 penetrate. Accordingly, when the cutting machine 10 moves from the left side to the right side in FIG. 1 with respect to the sample 100 to be cut, the right end portion of the protective cover 63 comes into contact with the sample 100 to be cut. The abutted state is maintained. As the cutting machine 10 moves to the right side, the protective cover 63 rotates clockwise in FIG. 1, and the left portion of the protective cover 63 in FIG. 1 is gradually accommodated inside the saw cover 60. Thereby, during the cutting operation, the rotary blade 50 is covered by the saw cover 60 and the protective cover 63 except for the cutting portion.

  As shown in FIG. 1, the drive unit mounting portion 47 fixed to the right side of the drive unit 30 (the motor housing 32, the gear case 41) is in contrast to the rotation support unit 21 fixed to the upper surface side of the base 20. The drive unit 30 as a whole can be rotated (first rotation) with respect to the base 20 in FIG. 1 around the rotation pin (first rotation axis) 22. Thereby, the amount of protrusion from the lower surface of the base 20 of the rotary blade 50 in FIG. 1 toward the lower side can be adjusted. A driving portion fixing portion 48 is formed on the opposite side of the driving portion mounting portion 47 when viewed from the rotating shaft 43. In the base 20, the link 23 is installed at a location corresponding to the driving portion fixing portion 48. The link 23 is formed with an elongated hole that guides the rotation of the drive unit 30 around the rotation pin 22, and a first positioning fixed to the drive unit 30 side during the first rotation. The pin 81 is configured to slide in the elongated hole. By fixing the first positioning pin 81 in the elongated hole, the positional relationship between the drive unit 30 and the base 20 during the first rotation can be fixed. Thereby, the protrusion amount from the lower surface of the base 20 of the rotary blade 50 can be fixed, and the cutting depth can be determined.

  On the other hand, the rotation support portion 21 is also provided with a second rotation shaft (not shown) extending in the left-right direction in FIG. For this reason, the drive unit 30 is set to be capable of rotating (second rotation) with respect to the base 20 in FIG. 2 around the second rotation axis via the drive unit mounting portion 47. The Correspondingly, the rotation support portion 21 is formed with an arc-shaped elongated hole centering on the second rotation axis and extending in the direction perpendicular to the paper surface in FIG. The fixed second positioning pin 82 is configured to slide in the elongated hole. By fixing the second positioning pin 82 using the knob 83 in the elongated hole, the positional relationship between the drive unit 30 and the base 20 during the second rotation can be fixed. Thereby, the cutting angle can be determined. Corresponding to this configuration, the link 23 is also installed on the upper surface of the base 20 in such a form that it can freely rotate in the second rotation direction.

  In order to move the cutting machine 10 at the time of cutting, adjust the amount of protrusion of the rotary blade 50 by the first rotation, adjust the cutting angle by the second rotation, etc., the drive unit 30 (motor housing 32) includes The handle portion 64 is fixed toward the upper side in FIG. A grip space for allowing a human finger or hand to be inserted is formed between the handle portion 64 and the motor housing 32, and the user can perform these operations by holding the handle portion 64. it can. A switch 65 is provided on the gripping space side of the handle portion 64. The user can control on / off of the cutting machine 10 (on / off of rotation of the rotary blade 50) by operating the switch 65.

  As shown in FIG. 2, the dust box 70 is rotatably connected to the saw cover 60 on the side opposite to the gear case 41 when viewed from the saw cover 60. This connection is achieved by fitting a cylindrical cover member 71 formed on the dust box 70 side so that the dust box 70 can be rotated around the connection portion 61 by fitting to the outer periphery of the cylindrical connection portion 61 in the saw cover 60. Done with. For this reason, the connection part 61 (opening part 62) becomes a rotation axis (dust box rotation axis) of the dust box 70. Here, the dust box rotation shaft may be provided at a position different from the opening 62 as long as the opening 62 and the inside of the dust box 70 can be connected when the dust box 70 is rotated to the maximum. However, the dust box rotation shaft is preferably provided in the vicinity of the opening 62. Further, if the dust box rotation shaft is configured to be located in the opening as in the present embodiment, the connecting portion between the saw cover 60 and the dust box 70 is always connected, so that a simple structure can be achieved. .

In addition, a space that can accommodate chips is formed inside the dust box 70. With the above configuration, this space is spatially coupled to the portion covered with the saw cover 60 via the opening 62 provided in the saw cover 60. Further, in order to support the dust box 70 when the dust box 70 rotates, a dust box link 66 is formed on the saw cover 60, and a dust box guide portion 72 is formed on the dust box 70 side. When the dust box 70 is rotated, the third positioning pin 84 fixed in the dust box guide portion 72 is set to slide in an elongated hole provided in the dust box link 66. The relationship between the dust box link 66 and the third positioning pin 84 is the same as the relationship between the link 23 and the first positioning pin 81.

  3 is a side view (a) of the dust box 70 viewed from the same direction as FIG. 1, a sectional view (b) in the BB direction, and a sectional view (c) in the CC direction. Here, the right side in FIGS. 3B and 3C is the direction in which the saw cover 60 exists. The cross-sectional shape (FIG. 3B) on the left side in FIG. 3A of the dust box 70 is a substantially rectangular shape, whereas on the right side, as shown in FIG. The lower end portion on the side away from 60 is chamfered. As shown in FIG. 3A, the chamfered region becomes shallower as the distance from the opening 62 increases, and there is no chamfered region in the cross section in the BB direction (FIG. 3B).

  When using the cutting machine 10 having the above configuration, the user rotates the rotary blade 50 by holding the handle portion 64 and operating the switch 65. In this state, after the lower surface of the base 100 is brought into contact with the sample 100 to be cut, the rotary blade 50 is brought into contact with the sample 100 to be cut. In this state, the sample to be cut 100 is cut by moving the cutting machine 10 toward the right side in FIG. At this time, the chips generated from the cut portion pass through the opening 62 and are accommodated in the space inside the dust box 70. When performing this cutting, the cutting depth is arbitrarily adjusted by the first rotation in the drive unit, and the cutting angle is arbitrarily adjusted by the second rotation.

  Here, FIG. 4 is a cross-sectional view corresponding to FIG. 2 in the case where the cutting angle is set by performing the second rotation so that the drive unit 30 and the rotary blade 50 are inclined to the side where the dust box 70 is located on the upper surface of the base. It is. 1 to 3, when the drive unit 30 and the rotary blade 50 are tilted by the second rotation to the side where the dust box 70 is located, the lower left side (side away from the saw cover 60) of the dust box 70. The end portion comes into contact with the upper surface of the base 20. However, as shown in FIG. 3, the lower part on the right side of the dust box 70 in FIG. 1 has a chamfered shape, and in this case, it is in contact with the upper surface of the base 20 in FIG. It is an end portion on the side away from the saw cover 60 at the lower part of the left region. For this reason, when this contact occurs, a force for rotating the dust box 70 clockwise around the opening 62 acts on the left side region of the dust box 70 in FIGS. 1 and 3A. FIG. 4 shows a form in which the inclined angle of the rotary blade 50 is further increased and the chamfered portion of the dust box 70 is in contact with the upper surface of the base 20.

  That is, in the cutting machine 10 described above, the rotary blade 30 can be largely inclined toward the side where the dust box 70 is located. Alternatively, even when the rotary blade 50 is greatly inclined, the lower portion of the left region in FIG. 3A of the dust box 70 moves upward by the rotation of the dust box 70. For this reason, the lower part of the area | region of the left side in Fig.3 (a) of the dust box 70 does not need to be a chamfering shape. For this reason, it becomes possible to enlarge the volume of the space inside the dust box 70 (the space in which chips are accommodated). In addition, when the dust box 70 rotates, the opening 62, which is a chip entry port, is not affected at all, and the efficiency of collecting chips into the dust box 70 is not lowered.

  On the other hand, FIG. 5 is a side view corresponding to FIG. 1 of a cutting machine having a conventional structure in which the dust box 170 does not rotate, and FIG. 6 is a cross-sectional view corresponding to FIG. ). FIG. 7 is a side view (a) showing the dust box 170 in this case in the same manner as FIG. 3, a cross-sectional view in the EE direction (b), and a cross-sectional view in the FF direction. FIG. 8 is a cross-sectional view showing a configuration when the rotary blade 50 is tilted toward the dust box 170 side from the state of FIG. Here, the same components as in FIG. 1 and the like are used except that the shape of the dust box 170 and the mechanism related to the second rotation are not used because the dust box 170 does not rotate. And

  In the dust box 170, when the rotary blade 50 is inclined to the side where the dust box 170 is located, as shown in FIG. 8, the dust box 170 extends from the lower saw cover 60 over the entire left and right direction in FIG. The far side contacts the upper surface of the base 20. For this reason, as shown in FIG. 7, it is necessary to form a chamfered shape throughout the left-right direction in FIG. For this reason, it is difficult to increase the volume of the space inside the dust box 170. Or in order to make this volume large, it is necessary to make it the form which expanded the dust box 170 in the area | regions other than the lower part. In this case, since the whole cutting machine becomes large, it is not preferable as a portable small cutting machine.

  On the other hand, in the above-described cutting machine 10, the dust box 70 is provided so as to be rotatable with respect to the saw cover 60, whereby the chamfered portion on the bottom surface of the dust box 70 is locally located on the right side in FIG. 1. Should be provided. For this reason, even when it is set as the setting which can take the inclination angle with respect to the base 20 of the rotary blade 50 large, the capacity | capacitance inside the dust box 70 can be enlarged.

  The dust box 70 can be rotated upward and downward with reference to the lower end of the rotational position of the dust box 70 when the protrusion amount of the rotary blade 50 from the lower surface of the base 20 is adjusted to be maximum. It is preferable to set so that. Accordingly, the dust box 70 can be set not to come into contact with the upper surface of the base 20 regardless of how the protrusion amount of the rotary blade 50 is set.

  Next, in the above-described cutting machine 10, a case where the amount of protrusion on the lower surface side of the base 20 of the rotary blade 50 is reduced will be described. As described above, this adjustment corresponds to the case where the first rotation is performed clockwise in FIG. FIG. 9 is a side view corresponding to FIG. 1 in this case. In this case, since the dust box 70 rotates counterclockwise from the state of FIG. 1, the lower left portion of the dust box 70 in FIGS. 9 and 3A abuts the upper surface of the base 20, and the lower right portion. And the upper surface of the base 20 are separated from each other. Accordingly, the chip accommodation is not particularly affected, and the situation that the rotary blade 50 is covered with the saw cover 60 is not changed on the upper surface side of the base 20, so that the chip scattering is not affected. Absent.

  Even when the second rotation is performed so that the rotary blade 50 is inclined to the opposite side to the saw cover 60 from this situation, the dust box 70 is shown in FIG. 6 because the left side of the dust box 70 contacts the upper surface of the base 20. Rotate clockwise. When the inclination angle increases, the end portion of the dust box 70 on the right side of the dust box 70 on the side away from the saw cover 60 finally comes into contact with the upper surface of the base 20, as in FIG. 4. For this reason, this operation | movement is smoothly performed only by making only the location which finally contact | abuts into a chamfering shape.

  That is, in this cutting machine 10, the dust box 70 having a large internal capacity can be used regardless of the amount of protrusion on the lower surface side of the base 20 of the rotary blade 50.

  Next, the form at the time of attaching / detaching the rotary blade 50 in this cutting machine 10 is demonstrated. Even in this case, the above-described configuration in which the dust box 70 is rotatable is effective.

  FIG. 10 is a side view of a configuration in which the dust box 70 is rotated in the clockwise direction from the state of FIG. 1 for this work, and FIG. 11 is a sectional view in the GG direction. As shown in FIG. 10, the tightening member 46 and the flange 45 can be exposed by rotating the dust box 70. Thereby, after removing the fastening member 46 using a tool, the flange 45 can be removed, and the rotary blade 50 can be removed from the rotating shaft 43. Thereby, the rotary blade 50 can be easily replaced.

  On the other hand, in the cutting machine having the conventional configuration shown in FIG. 5, in order to perform this operation, as shown in FIG. 12 with the dust box 170 removed, the fastening member 46 and the flange 45 are exposed. Therefore, it was necessary to remove the fastening member 46 and the flange 45. In this case, the replacement work of the rotary blade 50 becomes complicated for the user.

  Alternatively, the cutting machine can have a configuration shown in a side view in FIG. 13 and a cross-sectional view in the HH direction in FIG. Here, FIG. 15A shows a side view similar to FIG. 3, FIG. 15B shows a cross-sectional view in the II direction, and FIG. 15C shows a cross-sectional view in the JJ direction. A dust box 270 having a different shape is used. Thereby, even if the dust box 270 is mounted, if the tightening member 46 and the flange 45 are exposed, it is not necessary to remove the dust box 270 when the rotary blade 50 is replaced. However, in this case, it is clear that the capacity of the space inside the dust box 270 is reduced.

  In the cutting machine 10 described above, since the dust box 70 is configured to rotate with respect to the saw cover 60, the replacement work of the rotary blade 50 is facilitated.

  In the above configuration, the rotation axis of the dust box 70 and the central axis of the opening 62 (the connecting portion 61) are the same. However, an opening for accommodating chips can be secured. And if it is the structure which can rotate a dust box with respect to a saw cover, these do not need to be the same. However, when the rotation axis of the dust box 70 is present in the opening 62, it is more preferable because even when the dust box 70 is largely rotated, the chip accommodation does not change greatly.

  In addition, a mechanism other than the above mechanism can be used as long as the drive unit can be configured to perform the first rotation and the second rotation on the base. It is clear that it is effective to use a saw cover and a dust box having the structure. Further, the specific shapes of the saw cover and the dust box are arbitrary as long as the above configuration can be realized.

DESCRIPTION OF SYMBOLS 10 Cutting machine 20 Base 21 Rotation support part 22 Rotation pin (1st rotation axis)
23 Link 30 Drive part 31 Motor 32 Motor housing 33, 34 Bearing 35 Motor output shaft 36 Cooling fan 37 Pinion gear 40 Rotation drive transmission mechanism 41 Gear case 42 Gear 43 Rotation shaft 44, 45 Flange 46 Tightening member 47 Drive part attachment part 48 Drive Part fixing part 50 rotary blade (round saw blade)
60 saw cover 61 connecting portion 62 opening portion 63 protective cover 64 handle portion 65 switch 66 dust box links 70, 170, 270 dust box 71 cover member 72 dust box guide portion 81 first positioning pin 82 second positioning pin 83 knob 84 third Positioning pin 100 Sample to be cut

Claims (6)

On the upper surface of the base, a drive unit that drives a rotation shaft to which the rotary blade is fixed is installed in a state in which the first rotation and the second rotation with different rotation directions are possible. A cutting having a configuration in which the amount of protrusion of the rotary blade partially protruding from the lower surface of the base is adjusted by the rotation of 1, and the inclination angle of the rotary blade with respect to the base is adjusted by the second rotation. Machine,
A saw cover that covers the rotary blade on the upper surface side of the base and is fixed to the drive unit;
The portion covered with the saw cover and the inside are spatially coupled through an opening provided in the saw cover, and are rotatable with respect to the saw cover around a dust box rotation shaft. A dust box connected to the saw cover on the side opposite to the drive unit as seen from the saw cover;
A cutting machine comprising:   The cutting machine according to claim 1, wherein the dust box rotation shaft is configured to exist in the opening. The rotation direction of the rotary blade is such that the direction in which the outer periphery of the rotary blade moves on the lower side during rotation is a direction from the rotation shaft toward a first rotation shaft that is a rotation shaft in the first rotation. Is set to
2. The cutting machine according to claim 1, wherein the opening and the dust box rotating shaft are provided on a side of the first rotating shaft with respect to the rotating shaft.   The cutting machine according to any one of claims 1 to 3, wherein an end portion of the lower part of the dust box on the side away from the saw cover has a chamfered shape. In the dust box,
The cutting machine according to claim 4, wherein the chamfered shape is formed only in a region closer to the first rotation shaft than the rotation shaft.   The dust box can be rotated upward and downward with reference to the lower end of the rotational position of the dust box when the amount of protrusion of the rotary blade from the lower surface of the base is adjusted to be maximum. The cutting machine according to claim 1.

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