JP4795097B2 - Cutting machine - Google Patents

Description

  The present invention relates to a cutting machine such as a tabletop circular saw machine that performs a cutting operation by moving a cutting machine body having a rotating circular cutting blade up and down with respect to a table for fixing a cutting material such as wood.

In this kind of cutting machine, what is provided with the dust collector in order to prevent scattering of the cutting powder (cutting powder) which generate | occur | produces during a cutting operation and to maintain a favorable work environment is provided.
Conventionally, a technique has been provided in which cutting powder generated mainly in the vicinity of a cutting site during a cutting operation is forcibly collected in a blade case by wind generated by, for example, rotation of a cutting blade and forcibly collected by a dust collector. Conventionally, for example, Japanese Patent Application Laid-Open No. 2005-14309 or Japanese Patent No. 3445336 discloses a technique related to dust collection of cutting powder generated during cutting work.
JP 2005-14309 A Japanese Patent No. 3445336

As described above, various devices for preventing the scattering of cutting powder generated during the cutting work have been conventionally made, and the work environment is maintained well.
On the other hand, when removing cutting powder remaining on the table or other various parts when the cutting machine is not operated, for example, after the cutting work is completed, compressed air is separately used using an air gun or the like. And so on. For this reason, an air gun or the like must be prepared to clean the cutting machine (removal of cutting powder) after the cutting operation is completed, which is troublesome in this respect.
In addition, when an air gun or compressed air supply equipment is not provided at the work site, the worker blows to clean the cutting machine after cutting work, or blows off the cutting powder or wipes with a cloth scrap. It was inconvenient in this regard.
The present invention has been made in view of the above-described conventional problems. Even when cutting work is not performed, the cutting powder can be blown away and removed without using an air gun or the like, whereby the cutting machine can be easily cleaned. An object is to provide a cutting machine having a convenient function.

For this reason, this invention was set as the cutting machine described in each claim of a claim.
According to the cutting machine of the first aspect, by switching to the second operation mode, it is possible to start the electric motor without rotating the saw blade and realize a state in which the motor cooling air is blown from the outlet. For this reason, when the cutting machine is cleaned (removal of cutting powder) after the cutting operation is finished, the cutting powder is blown off by the blown-out motor cooling air without worrying about the rotation of the saw blade. Can be cleaned.
According to the cutting machine according to claim 2, when the operation member is switched to the first operation mode side, the drive gear is engaged with the output shaft of the electric motor, and the rotation output of the electric motor passes through the drive gear and the spindle. Is transmitted to. On the other hand, when the operating member is switched to the second operation mode side, the drive gear moves in the axial direction of the spindle and is detached from the output shaft of the electric motor. In this state, since the drive gear is not meshed with the output shaft of the electric motor, the rotation output is not transmitted to the spindle, and therefore the saw blade does not rotate.
The first operation mode in which the electric motor is activated and the saw blade is rotated, and the electric motor is activated but the saw blade is not rotated with a simple configuration in which the drive gear is moved by the operation of moving the operation member in this way. Switching to the second operation mode in which the electric motor is idling can be realized.
According to the cutting machine of the third aspect, when the operation member is moved to the power cut-off position, the flexible pipe is positioned at the outlet and the cooling air is blown out through the flexible pipe. For this reason, by changing the direction of the flexible tube arbitrarily, the cooling air can be blown toward various parts, thereby efficiently cleaning the cutting machine after the cutting operation (blowing off the cutting powder). It can be carried out.
In particular, since the saw blade is not rotating, it does not hinder the work, so that the cutting powder adhering to the inside and the periphery thereof can be efficiently blown out with the flexible pipe directed into the blade case.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a cutting machine 1 including an operation mode switching mechanism 40 according to the first embodiment. The cutting machine 1 to be described below is characterized in that it includes an operation mode switching mechanism 40, and other basic configurations common to this type of cutting machine are not particularly changed in this embodiment.
As shown in FIG. 1 and FIG. 2, the cutting machine 1 is a so-called table-top type slide type circular saw machine, a table 2 for fixing a cutting material, and a cutting machine body supported so as to be movable up and down with respect to the table. 10 is provided. In the case of the present embodiment, the cutting machine main body 10 includes a support arm 4 that is supported by a lower slide mechanism 3 so as to be movable in the table surface direction. A cutting machine main body 10 is supported on the upper portion of the support arm 4 via an upper slide mechanism 5 so as to be horizontally movable in the table surface direction and tiltable up and down around the support shaft 6. FIG. 2 shows only the cutting machine main body 10.
The cutting machine main body 10 has an electric motor 12 built in the rear part of the main body case 11. The output shaft 12a of the electric motor 12 is supported by the main body case 11 via bearings 13 and 14 so as to be rotatable about the axis. A cooling fan 15 is attached to the output shaft 12 a of the electric motor 12. For this reason, when the electric motor 12 is started, the cooling fan 15 rotates. When the cooling fan 15 rotates, outside air (cooling air) is introduced into the inside through an intake port 11 a provided at the rear of the main body case 11. The introduced outside air flows forward (left side in FIG. 2) while cooling the commutator 12b, the winding portion 12c and the like of the electric motor 12. Cooling air that has cooled the electric motor 12 is exhausted to the outside through a blowout port 11 b provided in a side portion of the main body case 11. In FIG. 2, the flow of the cooling air exhausted is indicated by white arrows.
A loop-shaped handle portion 16 is integrally provided on the side portion of the main body case 11. As shown in FIG. 1, a trigger type switch lever 17 is provided on the inner peripheral side of the handle portion 16. When the operator holds the handle portion 16 and pulls the switch lever 17 with his fingertip, the electric motor 12 is activated and the cutting machine 10 can be operated.

As shown in FIG. 2, a gear case 20 is attached to the front portion of the main body case 11. The distal end side of the output shaft 12 a of the electric motor 12 is projected into the gear case 20 through the bearing 13. A gear portion 12d is formed at the tip of the output shaft 12a.
A spindle 21 is rotatably supported in the gear case 20 via bearings 22 and 23. The spindle 21 is arranged in parallel with the output shaft 12 a of the electric motor 12. The tip end side of the spindle 21 protrudes into the blade case 25 through the bearing 22. A circular saw blade 30 is attached to the tip of the spindle 21 protruding into the blade case 25.
The blade case 25 is a substantially semicircular case body that covers a substantially half range of the upper side of the saw blade 30, and is integrally provided at the tip of the gear case 20. A cover 26 is supported on the blade case 25 via a support shaft 27. The cover 26 is provided so as to be rotatable around the saw blade 30 about the support shaft 27. The lower half of the saw blade 30 protruding downward from the blade case 25 is covered by the cover 26. The cover 26 rotates about the support shaft 27 in conjunction with the vertical movement of the cutting machine main body 10, and thereby, the lower half of the saw blade 30 is automatically opened and closed. When the cutting machine body 10 is moved downward, the cover 26 is opened and the lower part of the saw blade 30 is exposed, so that the cutting operation can be performed.

The spindle 21 is provided with a spline shaft portion 21a. A driving gear 28 is supported on the spline shaft portion 21a. For this reason, the drive gear 28 is integrated with the spindle 21 for rotation, and is supported so as to be movable for movement in the axial direction. A compression spring 31 is interposed between the drive gear 28 and the receiving seat 29. The receiving seat 29 is mounted on the rear side of the spindle 21 (near the right end in FIG. 2). Since the receiving seat 29 is pressed against the side of the inner ring of the bearing 23 by the compression spring 31, it does not substantially displace in the axial direction and rotates integrally with the spindle 21. The drive spring 28 is urged by the compression spring 31 from the power transmission position indicated by the solid line in FIG. 2 toward the power cutoff position indicated by the two-dot chain line in FIG. 2 (leftward in FIG. 2).
In a state where the drive gear 28 is located at the power transmission position, the drive gear 28 is engaged with the gear portion 12 d of the output shaft 12 a of the electric motor 12. For this reason, when the electric motor 12 is started in a state where the drive gear 28 is located at the power transmission position, the rotational power is transmitted to the spindle 21 via the drive gear 28, thereby rotating the saw blade 30. This state corresponds to the first operation mode.
When the drive gear 28 is located at the power cutoff position, the drive gear 28 is not engaged with the gear portion 12d of the output shaft 12a of the electric motor 12. For this reason, in the state where the drive gear 28 is located at the power cut-off position, even if the electric motor 12 is activated, the rotational power is not transmitted to the spindle 21 via the drive gear 28, and therefore the saw blade 30 does not rotate (electric motor). 12 idling states).

An operation member 35 for switching between the first operation mode and the second operation mode is provided on a side portion of the gear case 20. The operation member 35, the drive gear 28 supported on the spindle 21 so as to be axially movable, the compression spring 31 and the like constitute an operation mode switching mechanism 40. Details of the operation mode switching mechanism 40 are shown in FIG.
The operation member 35 has a rectangular flat plate shape that is slightly curved along a certain range of the circumferential surface of the gear case 20 having a cylindrical shape. FIG. 4 shows a state in which the operation member 35 is viewed from the direction of the arrow (4) in FIG. Further, FIG. 6 shows a sectional view taken along line (6)-(6) in FIG. As shown in these drawings, an engagement piece 35a is integrally formed on the inner surface (upper surface in FIG. 3) of the operation member 35. The engaging piece portion 35 a projects from the inside of the gear case 20 through a window portion 20 a provided on the side portion of the gear case 20. The drive gear 28 is pressed against the engagement piece 35a by the compression spring 31. For this reason, the urging force of the compression spring 31 is always indirectly acting on the engagement piece 35 a and the operation member 35. Further, the movement of the drive gear 28 toward the power cut-off position side is restricted by the engagement piece 35a and the operation member 35. On the other hand, the engagement piece portion 35a is slidably contacted with the front surface of the engagement piece portion 35a without obstructing the rotation operation of the drive gear 28.
The operation member 35 is supported so as to be movable along the outer surface of the gear case 20. As shown in FIGS. 4 to 6, guide rail portions 20c and 20d having a U-shaped cross section are provided on the left and right sides of the window portion 20a so as to face each other. Both guide rail portions 20c, 20d are provided in parallel to each other along the axial direction (front-rear direction) of the spindle 21. Further, both guide rail portions 20 c and 20 d extend in a range straddling between the outer surface of the gear case 20 and the outer surface of the main body case 11. Left and right side portions 35b and 35c (left and right side portions in FIG. 6) of the operation member 35 are movably held by the guide rail portions 20c and 20d, so that the operation member 35 is attached to the outer surface of the gear case 20 and the main body case 11. It is supported so as to be movable within a certain range in the front-rear direction along the outer surface.
Further, the left-right distance (the vertical distance in FIGS. 4 and 5) between the guide rail portions 20 c and 20 d is set wider than the left-right width of the operation member 35. Therefore, as shown in FIGS. 4 and 5, the operation member 35 is supported so as to be movable within a certain range in the left-right direction (the vertical direction in FIGS. 4 and 5, the circumferential surface direction of the gear case 20). This will be described later.

As described above, the operation member 35 can be moved in a certain range in the front-rear direction along the axial direction of the spindle 21 and can also be operated in a certain range in the direction around the axis of the spindle 21 (left-right direction). It is supported.
On the outer surface of the operation member 35, a knob portion 35f, a blowout port 35g, and a connection port 35h are provided side by side. The operator can grasp the knob portion 35f with a fingertip and move the operation member 35 in the front-rear direction and the left-right direction. The blowout port 35g and the connection port 35h will be described later.
By operating the operation member 35 to move back and forth, the drive gear 28 is moved between the power transmission position and the power cut-off position, whereby the operation mode of the cutting machine 1 is changed to the first operation mode and the second operation mode. Can be switched to. As shown in FIG. 4, when the operation member 35 is moved forward, the operation mode of the cutting machine 1 is switched to the second operation mode. Conversely, when the operation member 35 is moved rearward as shown in FIG. 5, the operation mode of the cutting machine 1 is switched to the first operation mode. When the operation mode of the cutting machine 1 is the first operation mode, the drive gear 28 moves to the rear power transmission position against the compression spring 31 as shown by the solid line in FIG. It will be in the state meshed | engaged with the gear part 12d of 12a. Therefore, in this first operation mode, the rotational output of the electric motor 12 is transmitted to the spindle 21 via the drive gear 28. Therefore, in the first operation mode, when the electric motor 12 is activated, the saw blade 30 rotates, and thus the cutting operation can be performed.
On the contrary, when the operation mode of the cutting machine 1 is the second operation mode, the drive gear 28 is moved to the front power cut-off position by the urging force of the compression spring 31 as shown by a two-dot chain line in FIG. Therefore, in the second operation mode, the drive gear 28 is not engaged with the gear portion 12d of the output shaft 12a of the electric motor 12. Accordingly, in this second operation mode, the rotation output of the electric motor 12 is not transmitted to the spindle 21, so the saw blade 30 does not rotate even when the electric motor 12 is activated.

Next, by moving the operating member 35 in the left-right direction, the operating member 35 can be held on the first operation mode side, and this holding state can be canceled. As shown in FIG. 4, two holding recesses 35 d and 35 e are provided on the left side portion of the operation member 35 at a constant interval in the front-rear direction. Corresponding to the two holding recesses 35d and 35e, the left guide rail portion 20c is provided with two holding projections 20e and 20f.
As shown in FIG. 5, the operation member 35 is moved to the first operation mode side on the rear side, and further moved to the left side (the upper side in FIG. 5, the position indicated by the two-dot chain line in FIG. 6). The holding protrusions 20e and 20f are fitted in the recesses 35d and 35e, respectively.
When the fingertip is released from the knob portion 35f in this fitted state, the operation member 35 is pushed forward by the urging force of the compression spring 31, and the holding projections 20e and 20f are fitted into the holding recesses 35d and 35e. Is retained. By holding the fitting state, the operation member 35 is held on the first operation mode side on the rear side, and the drive gear 28 is held at the power transmission position, so that the cutting machine 1 is held in the first operation mode. Is done. In FIG. 6, the operation member 35 in the first operation mode is indicated by a two-dot chain line.
As shown in the figure, in this holding state, the rear portions of both holding projections 20e and 20f are engaged with the rear portions of both holding recesses 35d and 35e in the left-right direction, and this engagement state is indirectly held by the biasing force of the compression spring 31. It has come to be. For this reason, the said operation member 35 is reliably hold | maintained at the position (position shown in FIG. 5) by the side of the 1st operation mode, and the 1st operation mode state of the cutting machine 1 is cancelled | released carelessly by the vibration etc. There is no such thing.
In order to move the operation member 35 from the first operation mode side to the second operation mode side, the operator holds the knob 35f and slightly moves the operation member 35 to the rear side against the compression spring 31. Thus, the left and right meshing states of both holding projections 20e and 20f with respect to both holding recesses 35d and 35e are released. From this release state, the operation member 35 is moved to the right. As a result, the operating member 35 and thus the drive gear 28 can move to the front power cut-off position side by the urging force of the compression spring 31. For this reason, if the fingertip is released from the knob portion 35f in this released state, the drive gear 28 pushes the operating member 35 forward by the urging force of the compression spring 31 and moves to the power cutoff position side (the direction indicated by the white arrow in FIG. 3). ) Thus, the operation mode of the cutting machine body 10 can be switched from the first operation mode to the second operation mode.
Conversely, when the operation mode of the cutting machine body 10 is switched from the second operation mode to the first operation mode, the operation member 35 is opposed to the urging force of the compression spring 31 to transmit the rear power. If the slide operation is performed to the position side and then the left end is moved to release the fingertip, the holding projections 20e and 20f are engaged with the holding recesses 35d and 35e by the indirect action of the compression spring 31, respectively, and the operation member 35 is engaged. Is held in the power transmission position, and thus the cutting machine body 10 is held in the first operation mode.

Next, the operation member 35 is provided with blowout ports 35g to 35g and a connection port 35h in addition to the engagement piece portion 35a and the knob portion 35f described above. As shown in FIGS. 4 and 5, the air outlets 35 g to 35 g are constituted by three slits that are long in the width direction at substantially the center in the longitudinal direction (front-rear direction) of the operation member 35. The connection port 35h has a cylindrical shape and projects outward (lower side in FIGS. 2 and 3). The connection port 35h penetrates the operation member 35 in the plate thickness direction. A flexible pipe 36 that is flexible over the entire length and can be oriented in any direction is connected to the connection port 35h. A blowing nozzle 37 is attached to the distal end side of the flexible tube 36.
As shown in FIGS. 2 and 5, in the first operation mode state of the cutting machine 1 in which the operation member 35 is positioned on the first operation mode side, the blowing ports 35 g to 35 g of the operation member 35 are blown out of the main body case 11. Located in the mouth 11b. Therefore, the cooling air generated by the cooling fan 15 is exhausted to the outside through the air outlet 11b of the main body case 11 and the air outlets 35g to 35g of the operation member 35. Further, as shown in FIG. 2, in the first operation mode state, the connection port 35 h is located on the side portion of the main body case 11 and is closed.
On the other hand, in the second operation mode state of the cutting machine 1 in which the operation member 35 is positioned on the second operation mode side as shown in FIGS. 3 and 4, the outlets 35g to 35g of the operation member 35 are gear cases. It will be in the state which was located in the side part of 20 and was plugged up. Further, in the second operation mode state, the connection port 35 h is positioned at the blowout port 11 b of the main body case 11 instead of the blowout ports 35 g to 35 g. For this reason, in the second operation mode state, the cooling air generated by the cooling fan 15 flows into the flexible tube 36 through the outlet 11b and is exhausted from the outlet nozzle 37. In this second operation mode state, the cutting powder can be removed using the cooling air blown from the blowing nozzle 37. By directing the flexible tube 36 in an arbitrary direction, the cutting machine 1 and its surrounding chips can be blown away.

According to the embodiment exemplified above, the operation mode of the cutting machine 1 can be switched between the first operation mode and the second operation mode by manually operating the operation member 35. In the first operation mode shown in FIGS. 2 and 5, the drive gear 28 is engaged with the gear portion 12 d of the output shaft 12, and the rotational power of the electric motor 12 is transmitted to the spindle 21. Therefore, the cutting operation can be performed in the first operation mode. In the first operation mode, the motor cooling air is exhausted from the side of the cutting machine main body 10 through the air outlet 11b of the main body case 11 and the air outlets 35g to 35g of the operation member 35.
On the other hand, in the second operation mode shown in FIGS. 3 and 4, the drive gear 28 is not engaged with the gear portion 12d of the output shaft 12a. Therefore, the rotation output of the electric motor 12 is not transmitted to the spindle 21 (the idling state of the electric motor 12), and therefore the saw blade 30 is not rotated. However, when the switch lever 17 of the handle portion 16 is turned on in the second operation mode, the electric motor 12 is activated, and thereby outside air is introduced from the intake port 11a at the rear portion of the main body case 11. Outside air (motor cooling air) introduced into the main body case 11 is blown into the flexible pipe 36 through the blowout port 11b by the cooling fan 15, and finally blown out from the blowout nozzle 37 to the outside. Using the motor cooling air blown from the blowing nozzle 37, the cutting powder adhering to and accumulating on each part of the cutting machine 1 and the cutting powder scattered around the cutting machine 1 can be blown off. The operator can efficiently perform the work of blowing cutting powder (cleaning of the cutting machine 1) by directing the flexible tube 36 in an arbitrary direction.
Therefore, when cutting powder adhering to the cutting machine 1 is removed after the cutting operation is completed, it is not necessary to prepare a tool such as an air gun as in the conventional case, so that the cutting machine 1 can be easily cleaned. And can be done quickly.

Various modifications can be made to the embodiment described above. For example, the operation mode switching mechanism 40 configured to urge the drive gear 28 toward the power cut-off position side using the compression spring 31 is illustrated, but the same operation and effect can be obtained by a configuration in which the compression spring 31 is omitted. Can do. The cutting machine main body 10 provided with the operation mode switching mechanism 50 according to the second embodiment is shown in FIGS. The same members and configurations as those of the operation mode switching mechanism 40 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The operation member 51 of the operation mode switching mechanism 50 of the second embodiment includes a knob portion 51a, outlets 51b to 51b, and a connection portion 51c on the outer side surface (lower surface in FIGS. 7 and 8). The configuration is the same as in the first embodiment.
As shown in FIG. 9, the operation member 51 is supported so as to be slidable in the front-rear direction through guide rail portions 54 and 55 having a U-shaped cross section provided on the side portion of the gear case 20 as in the first embodiment. Both guide rail portions 54 and 55 are provided in parallel to each other along the left and right side portions of the window portion 52 provided on the side portion of the gear case 20. In the second embodiment, the operation member 51 moves only in the front-rear direction and does not move in the left-right direction unlike the first embodiment.
On the inner surface (upper surface in FIGS. 7 and 8) of the operation member 51, two engagement piece portions 51d and 51e are provided in parallel with a certain distance from each other. Both the engaging piece portions 51 d and 51 e project into the gear case 20 through a window portion 52 provided on the side portion of the gear case 20. The window 52 is formed to have a larger opening in the front-rear direction than the window 20a in the first embodiment. A drive gear 53 is sandwiched between the engaging pieces 51d and 51e. That is, the engagement piece 51d is slidably contacted with the front surface of the drive gear 53 in a state that does not inhibit the rotation operation, and the engagement piece 51e is slidably contacted with the rear surface of the drive gear 53 in a state that does not inhibit the rotation operation. Has been. The drive gear 53 is supported on the spindle 21 via the spline shaft portion 21a as in the first embodiment. Accordingly, the drive gear 53 is integrated with the spindle 21 for rotation, and is supported so as to be relatively movable with respect to movement in the axial direction. However, unlike the first embodiment, the drive gear 53 is not spring-biased in the spindle axis direction.
The operation member 51 is supported so as to be movable by manual operation in the front-rear direction and the left-right direction as in the first embodiment. A flexible pipe 36 is connected to the connecting portion 51c, and a blowing nozzle 37 is attached to the tip of the flexible pipe 36.
Although not shown, a mechanism for holding the operation member 51 between the operation member 51 and the guide rail portions 54 and 55 at the front power cutoff position and the rear power transmission position. Is incorporated. For example, the position holding mechanism can be configured to hold a position by pressing a leaf spring or a spring-biased steel ball against the operation member 52.

According to the operation mode switching mechanism 50 according to the second embodiment configured as described above, when the knob 51a is picked and moved in the front-rear direction of the operation member 51, the drive gear is sandwiched between the engagement pieces 51d and 51e. 53 moves integrally with the operation member 51 in both axial directions of the spindle 21.
When the operation member 51 is moved to the first operation mode side on the rear side (right side in FIGS. 7 and 8), the drive gear 53 is pushed by the front engagement piece 51d to move to the power transmission position. When moved to this power transmission position, the drive gear 53 is engaged with the gear portion 12d of the output shaft 12a of the electric motor 12, so that the cutting machine 1 can be switched to the first operation mode. On the other hand, when the operation member 51 is moved to the second operation mode side on the front side (left side in FIGS. 7 and 8), the drive gear 53 is pushed by the rear engagement piece 51e to move to the power cut-off position. When moved to the power cut-off position, the drive gear 53 is disengaged from the gear portion 12d of the output shaft 12a of the electric motor 12, so that the cutting machine 1 can be switched to the second operation mode.
In the first operation mode, when the electric motor 12 is started, the spindle 21 rotates through the drive gear 53, and thus the saw blade 35 rotates, so that the cutting operation can be performed. In the second operation mode, even if the electric motor 12 is activated, the saw blade 35 does not rotate because the spindle 21 does not rotate. However, even in this second operation mode, the electric motor 12 rotates and cooling air is introduced into the main body case 11, so that the cooling air is blown into the flexible pipe 36 through the blowing port 11 b, and this causes the blowing nozzle 37 to be blown. After being blown out. The operator can blow off the cutting powder by using the motor cooling air blown from the blowing nozzle 37 with the flexible pipe 36 oriented in an arbitrary direction. Moreover, since the saw blade 35 does not rotate in the second operation mode, cleaning after the cutting operation can be performed efficiently.
From this, also by the operation mode switching mechanism 50 according to the second embodiment, the operation member 51 is moved manually to switch the cutting machine 1 to the second operation mode, so that an air gun or the like can be separately provided as in the prior art. The cutting powder can be removed simply and quickly without preparation.

Further modifications can be made to the first and second embodiments described above. For example, although the table-type slide circular saw is illustrated as the cutting machine 1, the present invention can be similarly applied to a table-type circular saw that does not have a slide mechanism or a stationary circular saw.
Further, by providing the operation member 35 (51) with the blowing port 35g (51b) and providing the connection port 35h (51c) and connecting the flexible pipe 36, these are moved by the operation of the operation member 35 (51). Although the structure which moves integrally was illustrated, as an operation member which does not have these, a flexible pipe is connected to the blow-out port of the main body case 11 separately from the movement operation of the operation member, and the cooling air blown out from this is blown off the cutting powder. It is good also as a structure used for.

It is a figure which shows embodiment of this invention, and is a whole perspective view of a desktop slide circular saw. It is a longitudinal cross-sectional view which shows the internal structure of the cutting machine main body provided with the operation mode switching mechanism which concerns on 1st Embodiment. In this figure, the drive gear located at the power transmission position is indicated by a solid line, and the drive gear located at the power cutoff position is indicated by a two-dot chain line. It is a longitudinal cross-sectional view of the operation mode switching mechanism according to the first embodiment. This figure shows a state where the drive gear is located at the power cut-off position. It is the figure which looked at the operation mode switching mechanism which concerns on 1st Embodiment from the arrow (4) direction in FIG. This figure shows a state in which the operating member is moved to the power cut-off side (second operation mode side). It is the figure which looked at the operation mode switching mechanism which concerns on 1st Embodiment from the arrow (4) direction in FIG. This figure shows a state where the operating member is moved to the power transmission side (first operation mode side). FIG. 6 is a cross-sectional view taken along the line (6)-(6) in FIG. 3 and is a view of the operation member as viewed from the rear side. It is a longitudinal cross-sectional view which shows the internal structure of the cutting machine main body provided with the operation mode switching mechanism which concerns on 2nd Embodiment of this invention. In this figure, the drive gear located at the power transmission position is indicated by a solid line, and the drive gear located at the power cutoff position is indicated by a two-dot chain line. It is a longitudinal cross-sectional view of the operation mode switching mechanism according to the second embodiment. This figure shows a state where the drive gear is located at the power cut-off position. FIG. 9 is a cross-sectional view taken along line (9)-(9) in FIG. 8 and is a view of the operation member as seen from the rear side.

Explanation of symbols

1 ... Cutting machine (desktop slide circular saw)
DESCRIPTION OF SYMBOLS 2 ... Table 3 ... Lower slide mechanism 4 ... Support arm 5 ... Upper slide mechanism 6 ... Spindle 10 ... Cutting machine main body 11 ... Main body case, 11a ... Intake port, 11b ... Outlet 12 ... Electric motor 12a ... Output shaft, 12b ... commutator, 12c ... winding part, 12d ... gear parts 13, 14 ... bearing 15 ... cooling fan 16 ... handle part 17 ... switch lever 20 ... gear case 20a ... window part, 20c, 20d ... guide rail part, 20e, 20f ... holding projection 21 ... spindle, 21a ... spline shaft portion 22, 23 ... bearing 25 ... blade case 26 ... cover 27 ... support shaft 28 ... drive gear 29 ... receiving seat 30 ... saw blade 31 ... compression spring 35 ... operating member 35a ... engaging piece, 35d, 35e ... holding recess, 35f ... knob, 35g ... outlet 35h ... connection port 36 ... flexible tube 37 ... blowing And the nozzle 40 ... operation mode switching mechanism (the first embodiment)
50. Operation mode switching mechanism (second embodiment)
51 ... Operation member 51a ... Knob portion, 51b ... Outlet, 51c ... Connection port, 51d, 51e ... Engagement piece 53 ... Drive gear

Claims (3)

An electric motor built in the cutting machine main body and a saw blade that is rotated by the electric motor, and when the electric motor is started, a cooling fan rotates and cooling air for cooling the electric motor is cooled in the cutting machine main body. A cutting machine which is generated and blown out from the outlet,
A first operation mode in which the rotation output of the electric motor is transmitted to the saw blade between the saw blade and the electric motor, and the electric motor is idling without transmitting the rotation output of the electric motor to the saw blade. An operation mode switching mechanism for switching to the second operation mode.
The operation mode switching mechanism includes an operation member that is manually operated. The operation member is switched to the second operation mode, and the cooling air blown from the blowout port by the idling of the electric motor is used to blow off the cutting powder. Cutting machine configured to be used. 2. The cutting machine according to claim 1, wherein a drive gear is meshed between an output shaft of the electric motor and a spindle to which the saw blade is attached, and a rotation output of the electric motor is transmitted to the spindle. The drive gear is supported so as to be displaceable in the axial direction in a state of being integrated with respect to the spindle, and the drive gear is moved in the axial direction of the spindle by moving the operation member, A cutting machine configured to switch between the first operation mode and the second operation mode by switching between a power transmission position meshed with the output shaft of the electric motor and a power cutoff position not meshed. 2. The cutting machine according to claim 1, wherein the operation member includes a flexible tube that can be directed in an arbitrary direction, and the flexible tube is disposed at the outlet when the operation member is positioned at the power shut-off position. A cutting machine that is positioned and configured to be able to blow cooling air blown out from the blowing port in an arbitrary direction.

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