JPH10109302A - Cutting machine - Google Patents

Abstract

(57) [Problem] To improve the feeling of use and operation of a handle and to lock a top dead center position of a cutting machine main body and a safety cover at the position. A cutting machine main body (6) is provided with a rod (36) to which a lock plate (37) is fixed at the lower end and a stopper plate (38) at the upper end. The rod (36) is rotatable, and a lock pin (39) linked to the lock plate (37). The cutting machine body 6 is locked at the top dead center position. Stopper plate 38
Is formed with a stopper portion 42, which always prevents the safety cover 10 from rotating in the direction in which the circular saw blade 8 is exposed. On the other hand, the handle 9 is provided with a lock-off button 46 for preventing the trigger 45 from being pushed. The lock-off lever 47 and the rotating plate 50 are linked with the unlocking operation of the trigger 45 by pushing the button 46.
, The rod 36 is rotated to release the lock at the top dead center of the cutting machine main body 6 and the lock of the safety cover 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention locks a cutting machine, in particular, a cutting machine body so as not to tilt at a top dead center position,
The present invention relates to a cutting machine provided with a device for locking a safety cover in such a position so as not to rotate.

[0002]

2. Description of the Related Art Generally, a cutting machine of this type mainly comprises a base and a cutting machine body which is mounted so as to be vertically tiltable with respect to the base. The cutting machine body has a circular saw blade. A drive motor that is rotationally driven, a blade case that partially covers the circular saw blade, a cover position that covers the circular saw blade exposed from the blade case, and a safety cover movable to an exposed position that exposes the circular saw blade Have been. In such a cutting machine, there has been proposed a cutting machine provided with an actuating means for rotating the safety cover from the cover position to the exposed position with respect to the circular saw blade as the cutting machine body descends from its top dead center position. As the operating means, for example, those using the gravity of the safety cover or using various link mechanisms linked to the movement of the cutting machine body are known. In these cutting machines, for example, as disclosed in Japanese Patent Application Laid-Open No. 5-104504, a lock device for holding the cutting machine main body at a top dead center position when the cutting machine is not used, and a safety device at the position. There has been proposed a device provided with a lock device for maintaining a cover state of a circular saw blade by a cover. This lock device is composed of a lever provided on the handle side of the cutting machine main body, and a lock plate interlocked with this lever via a rod. The lever is provided with a stopper that can abut on the upper end of the safety cover, and the stopper abuts on the upper end of the safety cover to lock (prevent) rotation of the safety cover. The lock plate is provided with a lock pin which is engaged and disengaged with an operation link for rotating the safety cover from the cover position of the circular saw blade to the exposure position in conjunction with the tilting of the cutting machine body, and the operation of the operation link is performed by the lock pin. It is configured to hold the top dead center position of the cutting machine body by restraining. The lever abuts on a lock-off button for locking a trigger for starting and stopping the motor at a motor stop position by the operation thereof, and the lock of the trigger is released by pushing the lock-off button into the handle. The configuration is such that the motor is released and the motor can be started by pressing the trigger.

[0003]

In the above-mentioned structure, it is necessary to operate the lever in connection with the gripping operation of the handle, and to directly press the lock-off button by the lever. There is a problem that the lever protrudes greatly from the grip portion of the handle, and the protruding lever hinders the grip of the handle, making it difficult to completely grip the handle, resulting in poor usability and operability of the handle. In view of the above problems, the present invention improves the usability and operability of the handle, locks the cutting machine body at the top dead center position, and locks the safety cover at that position (rotation prevention). It is intended to provide a cutting machine capable of performing the above operation.

[0004]

In order to achieve the above object, the present invention provides a base on which a workpiece is placed, and a cutting machine mounted so as to be vertically tiltable with respect to the base. The cutting machine body, a handle for tilting the cutting machine body in a vertical direction, a drive motor for rotating the rotary blade, a blade case for partially covering the rotary blade, and the blade case. And a safety cover movable to a cover position for covering the rotary blade exposed from the exposure blade and an exposure position for exposing the rotary blade, and a tiltable with respect to the base. An operating link for moving the safety cover from a cover position to an exposed position with respect to a rotary blade with tilting, wherein the cutting machine body has a lock for tilting operation at a top dead center position of the cutting machine body; Locking means for locking the movement of the safety cover in this position is provided, and a lock-off member for locking a trigger for starting and stopping the motor to a motor stop position is provided on the handle, and The gist of the present invention is to provide a cutting machine characterized in that an unlocking operation of the locking means is enabled in conjunction with a trigger unlocking operation of a member.

According to the present invention, the locking means provided on the cutting machine main body can lock the tilting operation at the top dead center of the cutting machine main body and the moving operation of the safety cover. An unlocking operation of the locking means can be performed in conjunction with a trigger unlocking operation of the off member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will now be described with reference to FIG.
This will be described with reference to FIG. FIG. 1 is an explanatory view of the table cutting machine 1 as viewed from the side, and FIG. 4 is an explanatory view of the table cutting machine 1 as viewed from above. The rear side of the turntable 3 rotatably mounted on the base 2 (the right side in FIGS. The front and the left are described as back)
, An arm 4 is pivotally mounted on the upper end of the arm 4, and a cutting machine main body 6 is pivotally mounted on the upper end of the arm 4 so as to be vertically movable. The cutting machine body 6 is rotated by a motor 11 and includes a disc-shaped circular saw blade 8 attached to a blade case 7 above, a handle 9 and a safety cover 10, and a torsion spring provided on the support shaft 5. (Not shown).

[0007] The blade case 7 has a cutout 12 that exposes the center of the circular saw blade 8.
Is covered by the center cover 13. This center cover 1
3 has one end rotatably mounted on the blade case 7 by a stepped bolt 14 and a washer 15, and has the other end hooked to a flanged bolt 16 screwed to the blade case 7. 16 is fixed to the blade case 7 by screwing.

A screw hole 17a is formed in the inner surface of the safety cover 10.
The boss 17 formed with the boss 17 and a circular trajectory centered on the boss 17 are slightly longer than the boss 17.
The insertion bosses 18, 18,...
On the other hand, a circular through-hole is formed in the center of the center cover 13, a center washer 19 is fitted into the through-hole, and a disk-shaped center plate 20 is further disposed inside. These bolts 2 are screwed into the screwing bosses 17 of the safety cover 10 from the inside of the blade case 7.
1 and through the insertion bosses 18, 18,..., Respectively, and connected to the safety cover 10 so as to be integrally rotatable. Therefore, the safety cover 10 is the center washer 1
9. Together with the center plate 20, the center plate 13 is rotatably mounted on the center cover 13. A locking plate 22 is formed at the end of the center plate 20 at a right angle to the inside of the blade case 7 (at the top dead center position in FIG. The both ends are respectively hooked between the center cover 13 and the safety cover 10 so that the circular saw blade 8 is attached to the safety cover 10 (in the clockwise direction in FIG. 1). This is a torsion spring that applies rotational force to the spring.

A bracket 24 protrudes from the arm 4 at a portion of the side of the blade case 7 pivotally connected to the support shaft 5 with a slight gap from the blade case 7. One end of the operation link 26 is rotatably mounted on the shaft. The operating link 26 extends upward along the side of the blade case 7, and has an arc-shaped long hole 27 that curves forward and is formed in the middle portion. And a stepped bolt 29 screwed into the blade case 7 is fitted through the washer 30. The upper portion of the operating link 26 enters the inside of the blade case 7 from the slit 7a of the blade case 7, goes around the rear of the center plate 20 along the inner surface, extends upward, and has a hook-like tip. Of the center plate 2
0 is engaged with the latch plate 22. The long hole 27 has a lower radius of curvature set to be smaller than the upper radius of curvature. In the state of FIG.
Is located at the lower end of.

A bolt 32 is screwed toward the blade case 7 behind the middle portion of the bracket 24.
A curved receiving portion 33 is formed on the side surface of the blade case 7 so as to protrude from the side surface of the bolt 32. Therefore, the bolt 32 serves as a top dead center stopper that prevents further rotation by the contact of the receiving portion 33 when the main body 6 rotates upward about the support shaft 5. On the other hand, a bolt 34 is provided on the side surface of the blade case 7 opposite to the bracket 24.
On the other hand, the arm 4 is formed with a projection 4a with which the bolt 34 comes into contact when the body 6 is pushed down, and serves as a bottom dead center stopper of the body 6 pushed down.

On the back side of the cutting machine main body 6, the cutting machine main body 6 is located at the top dead center position shown in FIG. 1, that is, as shown in FIG. A lock device 35 is provided for maintaining the position where the lock device 35 is fitted. As shown in FIGS. 4 and 5, the lock device 35 is provided on the gear housing 1 on the back surface of the blade case 7.
1a, a rod 36 rotatably supported, a lock plate 37 extending along the lower portion of the blade case 7 at the lower end of the rod, and an upper portion of the blade case 7 at the upper end of the rod. And a stopper plate 38 extended.

The lock plate 37 is formed in a flat plate shape along the lower side surface of the blade case 7, and is fixed to the lower end of the rod 36 by screws. A lock pin 39 inserted through pin insertion holes 7b, 7b formed in the blade case 7 is provided at the lower end of the lock plate 37.
The groove 40 which engages with is formed. As shown in FIG. 5, the groove 40 has a circular portion 40a and an elongated hole portion 40b continuous with the circular portion 40a, and is formed in a keyhole shape as a whole.

[0013] As shown in FIG.
One end of the groove 40 of the lock pin 39
A small-diameter neck portion 39a that fits with the lock plate 37 is formed, and a head portion 39b at the tip is locked to the outer surface of the lock plate 37 so as to be connected to the lock plate 37. The circular portion 40a of the groove 40 has a diameter larger than the head 39b of the lock pin 39, and serves as an insertion hole for the head 39b when the lock pin 39 is attached to the lock plate 37. The other end of the lock pin 39 is positioned so that the cutting machine body 6 can be engaged in a lock hole 26a formed below the long hole 27 of the operation link 26 in a state of the top dead center position. .

A cut-and-raised portion 37a is formed at the upper end of the lock plate 37 toward the blade case 7, and a compression coil spring is provided between the lock plate 37 and the blade case 7 at the cut-and-raised portion 37a. The lock plate 37 is always urged in a direction in which the lock pin 39 engages with the lock hole 26 a of the operation link 26. When the lock plate 37 rotates against the urging force of the compression coil spring 41 due to the rotation of the rod 36 as described later, the tip of the lock pin 39 is moved as shown by the imaginary line in FIG. The operation link 26 is configured to be detachable from the lock hole 26a.

The stopper plate 38 is formed in a flat plate shape along the upper side surface of the blade case 7, and is fixed to the upper end of the rod 36 with screws. At the lower end of the stopper plate 38, a stopper portion 42 bent toward the blade case 7 is formed. This stopper is formed integrally with the end of the safety cover 10 with the cutting machine body 6 at the top dead center position and the circular saw blade 8 completely covered by the safety cover 10 as shown in FIG. It is located at a position adjacent to the flange 10a. When the lock pin 39 shown in FIG. 10 is engaged with the lock hole 26a of the operation link 26, the stopper 42 faces the flange 10a of the safety cover 10 (FIG. 6). The rotation in the direction in which the circular saw blade 8 is exposed is prevented, while the lock pin 39 as shown by the imaginary line in FIG.
In the non-engagement position of the operation link 26 with respect to the lock hole 26a, the operation link 26 is not opposed to the flange 10a of the safety cover 10 (FIG. 7).
Thus, the rotation of the safety cover 10 in the direction in which the circular saw blade 8 is exposed is allowed. The upper end portion 38a of the stopper plate 38 is formed with a contact surface 38b with which a pressing portion 50c of the rotating plate 50 supported in the handle 9 described below comes into contact.

As shown in FIG. 8, a switch 43 for controlling starting and stopping of the motor is provided in a substantially D-shaped handle 9 extending obliquely from the housing of the motor 11.
The actuator 43a protruding from the switch 43 is pushed by a trigger 45 having a substantially V-shaped cross section rotatably supported by a rotating shaft 44, so that the switch 43 is turned on, and the motor 43a is turned on. Is started. Further, the trigger 45 is configured such that the distal end portion 45 a thereof always contacts the stopper portion 9 a formed on the housing of the handle 9 around the rotation shaft 44 by the urging force from the actuator.

A lock-off button 46 linked to a lock-off lever 47, which will be described later, is mounted on the front side surface of the handle 9 so as to be able to move in and out of the fitting hole 9b of the handle 9. The lock-off button 46 has a shaft portion 46 a slidably attached to the handle 9, a head portion 46 b larger in diameter than the shaft portion 46 a located outside the handle 9, and a tip portion 46 c located inside the handle 9. And

A lock-off lever 47 is attached to the handle 9 so as to be rotatable about a support shaft 48. The lock-off lever 47 has a substantially quadrangular prism-shaped lever portion 47a and a lever portion 47a. It has a protruding piece 47b and a protruding part 47c that protrude in opposite directions from both side surfaces. A compression coil spring 49 is elastically mounted between the projection 47c and the housing of the handle 9.
The lock-off lever 47 is always urged to rotate clockwise around the support shaft 48. As a result, the rounded tip of the projecting piece 47b of the lock-off lever 47 always keeps contact with the tip 46c of the lock-off button 46.
And is always urged to protrude outward. Then, when the lock-off button 46 is pressed against the urging force, the distal end 46c of the lock-off button 46 pushes the lock-off lever 47 through the projecting piece 47b of the lock-off lever 47 as shown in FIG. It is configured to be able to rotate counterclockwise around the support shaft 48. Further, the tip of the lever portion 47a of the lock-off lever 47 is formed in a flat shape, and the contact portion 4 always formed at the tip of the trigger 45 is formed.
When the lock-off lever 47 is turned counterclockwise by pressing the lock-off button 46 as described above, as shown in FIG. The tip of the lever portion 47b of the lock-off lever 47 is retracted from the contact portion 45b of the trigger 45 so that the trigger 45 can be pushed.

Further, a flat plate-like rotating plate 50 is mounted inside the switch 9 so as to be rotatable on the housing of the switch 9 about an axis substantially parallel to the rod 36. As shown in FIG. 11, the rotating plate 50 is located inside the handle 9 and the support shafts 50a, 50a supported by the receiving portion 9c of the housing of the handle 9, and abuts on the tip of the lever portion 47a of the lock-off lever 47. A planar contact surface 50b that can be contacted, and the contact surface 50b
And a pressing portion 50c which is narrow and protrudes to the opposite side to the support shaft, and the pressing portion 50c passes through the opening 9d formed in the housing of the handle 9 to pass through the opening 9d from the lower surface of the handle 9 to the inside. It is linked by projecting downward so that it can move, and by contacting the contact surface 38b of the stopper plate 38 described above. The rotating plate 50 is always pressed by the stopper plate 38 and is held inclined while being urged in the counterclockwise direction as shown in FIG. 6, and is pressed by the tip of the lever portion 47 a of the lock-off lever 47. Then, as shown in FIG. 7, it is rotated clockwise, and the pressing portion 50c presses the contact surface 38b of the stopper plate 38.

A flange 51 projecting outward from the handle 9 is formed on the blade case 7 side of the grip portion of the handle 9, and the safety cover 10 is formed by the flange 51.
The finger is prevented from being caught between the handle and the handle 9.

Next, the operation of the first embodiment will be described. First, when the cutting machine main body 6 is located at the top dead center shown in FIGS. 1 and 5, as shown in FIGS. The tip of the lock pin 39 of the lock plate 37 is engaged with the lock hole 26a of the operation link 26 by the urging force of the coil spring 41, whereby the tilt of the operation link 26 is restricted, and the cutting machine body 6 is moved to the top dead center. The position is held, that is, the downward tilt from the top dead center position of the cutting machine body 6 is locked.

When the cutting machine body 6 is located at the top dead center, the stopper portion 42 of the stopper plate 38 is brought into contact with the flange portion 10a of the safety cover 10 by the urging force of the compression coil spring 41, as shown in FIG. Because of the facing state, the rotation of the safety cover 10 in the direction in which the circular saw blade 8 is exposed is prevented (locked state). Stopper plate 3
8, the pressing portion 50c of the rotating plate 50 is pressed by the contact surface 38b, and the rotating plate 50 is
And its position is maintained by being urged in a counterclockwise direction around the center.

Further, in the above state, the lock-off button 46 is protruded to the outside of the handle 9 through the lock-off lever 47 by the urging force of the compression spring 49, and the leading end contact portion 45b of the trigger 45 is locked off. The triggering of the trigger 45 is prevented by abutting on the tip of the lever portion 47a of the lever 47, and the activation of the motor is prevented.

Next, when the lock-off button 46 is depressed in relation to the gripping operation of the handle 9 by the operator, the tip 46c of the lock-off button 46 is moved to the lock-off lever 47 as shown in FIGS. Is pushed against the urging force of the compression coil spring 49, and the lock-off lever 47 rotates counterclockwise about the support shaft 48. By the counterclockwise rotation of the lock-off lever 47, the tip of the lever portion 47a of the lock-off lever 47 is retracted from the contact portion 45b of the trigger 45, so that the trigger 45 can be pushed and the tip of the lever portion 47a rotates. Abuts against the contact surface 50b of the moving plate 50 and presses the contact surface 50b;
Thus, the rotation plate 50 rotates clockwise around the support shaft 50a. By the clockwise rotation of the rotation plate 50, the pressing portion 50c presses the contact surface 38b above the stopper plate 38 as shown in FIG. 7, whereby the rod 36 rotates. The rotation of the rod 36 causes the stopper portion 42 of the stopper plate 38 to be disengaged from the position facing the flange portion 10a of the safety cover 10, and the tip of the lock pin 39 of the lock plate 37 to be disengaged from the lock hole 26a of the operation link 26. It is possible to tilt the cutting machine body 6 downward by gripping the operation handle 9, rotate the safety cover 10 in the direction in which the circular saw blade 8 is exposed, and start the motor by pushing the trigger 45. .

In this state, when the cutting machine main body 6 is tilted downward, as shown in FIGS.
The stepped bolt 29 fitted in the long hole 27 forcibly turns downward about the pivotal connection portion (stepped bolt 25) with the bracket 24 as a fulcrum. Since the stepped bolt 25, which is the center of rotation, is set on the upper rear side of the support shaft 5, which is the center of rotation of the cutting machine main body 6, the difference in the center of rotation causes the hooking part 31 at the upper end to be hooked. Center plate 20 to stop
1 is pulled backward, and the center plate 20 is rotated counterclockwise in FIG. As a result, the safety cover 10 integrated with the center plate 20 also rotates counterclockwise against the urging force of the torsion spring 23 to expose the circular saw blade 8.

When the cutting machine body 6 is once tilted downward from its top dead center position, even if the lock-off button 46 is released from being depressed, the lock pin 39 remains in the operating link 26.
7 and the state shown in FIG. 10 and the state shown in FIG. 7 can be maintained.

When the cutting machine body 6 is returned to the top dead center position and the pushing of the trigger 45 is released after the work is cut, the tip of the lock pin 39 is locked by the urging force of the compression coil spring 41 into the lock hole of the operating link. The stopper portion 42 of the stopper plate 38 is in a state of facing the flange portion 10a of the safety cover 10, and is again locked at the top dead center position of the cutting machine main body 6 and is locked at that position. The function of locking the rotation of the safety cover can be achieved. Further, with the clockwise rotation of the lock-off lever 47, the lock-off button 46 is made to protrude outside the handle 9, and the pressing operation of the trigger 45 is again prevented.

Note that the rotation plate 5 is moved through the lock-off lever 47 by pressing the lock-off button 46 described above.
The pressing force to zero may be applied to the pressing force on the rotating plate 50 due to the fact that the distal end portion 45a can contact the contact surface 50b of the rotating plate 50 by the pushing operation of the trigger 45. In this case, even if the pushing force of the lock-off button 46 is weak, the rotating plate 50 is smoothly rotated by the force of the pushing of the trigger 45, and more reliable unlocking can be achieved.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. Since the second embodiment is the same as the first embodiment except for the shape of the lock-off lever 47, illustration and description of the structure of other parts are omitted, and FIG.
2 to 17, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

12 to 17, a lock-off lever 147 is mounted so as to be rotatable around a support shaft 48 in the handle 9 in the same manner as in the first embodiment described above. 147a, and a protruding portion 147b and a protruding portion 147c that protrude in opposite directions from both side surfaces of the lever portion 147a on the support shaft 48 side. A compression coil spring 49 is elastically mounted between the protrusion 147c and the housing of the handle 9, and constantly biases the lock-off lever 147 around the support shaft 48 clockwise. Thereby the lock-off lever 1
The projecting portion 147b of the 47 has an R-shaped tip that always keeps contact with the tip 46c of the lock-off button 46, and the lock-off button 46 is
It is urged so as to always protrude outward through the hole 47. Then, when the lock-off button 46 is pushed in against the urging force, the tip 46 c of the lock-off button 46 is turned into the protruding piece 147 of the lock-off lever 147 as shown in FIG.
The lock-off lever 147 can be rotated counterclockwise around the support shaft 48 via the b. Also,
On both sides of the distal end of the lever portion 147a of the lock-off lever 147, a projecting portion 1 that projects outward in a triangular prism shape is provided.
47d and 147e are formed. This overhang 1
47d is configured to be able to come into contact with the contact surface 50b of the rotating plate 50 by the rotation of the lock-off lever 147 due to the slight push-in operation of the lock-off button 46. The overhang portion 147e has a stopper surface for preventing the pushing operation of the trigger 45 together with the distal end surface of the distal end of the lever portion 147a. As shown in FIG. 13, the lock-off button 46 is pushed halfway from the outer position to the middle ( Less than,
In the range of the first-stage push), the push-down operation of the trigger 45 is prevented by facing the contact portion 45b of the trigger 45. Then, as shown in FIG. 14, when the lock-off button 46 is pushed all the way to the end (hereinafter, referred to as the second-stage push), the lock-off lever 147 is further rotated, and the stopper surface of the overhang portion 147 e is brought into contact with the trigger 45.
Is configured to be retracted from the abutting portion 45b and to be able to push the trigger 45.

Next, the operation of the second embodiment will be described. The state where the cutting machine body 6 is located at the top dead center position (FIG. 1)
In 5), as in the first embodiment, the lock pin 39 is engaged with the lock hole 26a of the operation link 26, so that the cutting machine main body 6 is held at the top dead center position. The portion 42 faces the flange portion 10a of the safety cover 10, and the rotation of the safety cover 10 is prevented (locked). Lock-off button 4
6 is projected outward of the handle 9 through the lock-off lever 147 by the urging force of the compression spring 49, and the distal end contact portion 45b of the trigger 45 contacts the distal end surface of the lever portion 147a of the lock-off lever 147. Trigger 4
5 is prevented, and starting of the motor is prevented.

When the lock-off button 46 is pushed in the first stage, the tip 46C of the lock-off button 46 pushes the protruding piece 147b of the lock-off lever 147 by the urging force of the compression coil spring 49, as shown in FIGS. , And the lock-off lever 147 rotates counterclockwise about the support shaft 48. The rotation of the lock-off lever 147 causes the overhanging portion 14 at the tip of the lever portion 147a.
7d presses the contact surface 50b of the rotating plate 50, and the rotating plate 50 rotates clockwise about the support shaft 50a (FIG. 16). Due to the rotation of the rotation plate 50, the contact surface 38b above the stopper plate 38 is pressed via the pressing portion 50c, and the rod 36 rotates. The rotation of the rod 36 causes the stopper plate 38
Of the lock cover 37 is disengaged from the lock hole 26a of the operating link 26, so that the cutting machine body 6 tilts downward. Accordingly, it is possible to rotate the safety cover 10 in the direction in which the circular saw blade 8 is exposed. On the other hand, in the first stage of pushing, the projecting portion 147e of the lock-off lever 147 is still in the trigger 4 position.
5, and is in a state of facing the contact portion 45b of FIG.

When the lock-off button 46 is pushed in the first stage, the lock at the top dead center position of the cutting machine body 6 and the lock of the safety cover 10 at that position are released. That is, starting of the motor is prevented. Thereby, when aligning the black line drawn on the workpiece with the circular saw blade 8 of the cutting machine body 6 tilted downward, the trigger 45 is inadvertently pushed in and the motor is started. Is prevented.

When the lock-off button 46 is further pushed down to the second stage (to the end), the lock-off lever 147 is further rotated counterclockwise as shown in FIGS. Is retracted from the contact portion 45b of the trigger 45, and the trigger 45 can be pushed,
The motor can be started by the pressing operation of the trigger 45. on the other hand,
The rotation of the lock-off lever 147 causes the rotation plate 5 to rotate.
0 also rotates clockwise, but at this time, FIG.
As shown in FIG. 7, the tip of the lock pin 39 is
Of the stopper plate 3
8 has already been removed from the position of the safety cover 10 facing the flange 10a.
As in the first stage of pushing, the cutting machine body 6 can be tilted downward and the safety cover 10 can be rotated in the direction in which the circular saw blade 8 is exposed.

In the second embodiment, the series of operations of pushing the lock-off button 46 is divided into two stages, that is, at the first stage position, the lock of the top dead center position of the cutting machine main body 6 and at that position. Although the lock of the safety cover 10 is released, the pushing operation of the trigger 45 is still locked, and the cutting machine body 6 is not locked until the second stage position.
The lock of the trigger 45 is released in addition to the lock of the top dead center position and the lock of the safety cover 10.

[0036]

According to the cutting machine of the present invention, the lever for releasing the lock of the trigger does not protrude from the grip portion of the handle as in the prior art, and the usability and operability of the handle are improved. Locking of the top dead center position of the main body, locking of the safety cover at that position (rotation prevention), and release operation of the lock in conjunction with unlocking operation of the trigger can be performed.

The trigger lock-off button can be directly operated by a finger holding the grip portion of the handle, and the lock (top dead center position lock of the cutting machine main body, rotation of the safety cover) can be performed by pushing the lock-off button. (Dynamic lock and lock of the trigger) are all released, and the trigger can be pushed in accordance with the gripping of the gripping portion of the handle in this state. That is, the above-described unlocking can be achieved by a series of operations of pressing the lock-off button.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view showing a pivoting operation of a safety cover accompanying a lowering of a cutting machine main body in FIG. 1;

FIG. 3 is an explanatory view showing a pivoting operation of a safety cover accompanying the lowering of the cutting machine main body in FIG. 1;

4 is a partially cutaway plan view of the cutting machine shown in FIG. 1 as viewed from above.

FIG. 5 is a rear view of the cutting machine shown in FIG. 1;

FIG. 6 is a partial cross-sectional view taken in the direction of arrow A in FIG. 5;

FIG. 7 is a partial cross-sectional view similar to FIG. 6 as viewed in the direction of arrow A in FIG. 5 and shows a state where a rod is rotated.

FIG. 8 is an enlarged sectional view of the handle shown in FIG. 5, corresponding to the state shown in FIG. 6;

9 is an enlarged cross-sectional view of the handle shown in FIG. 5, similar to FIG. 8, corresponding to the state shown in FIG. 7;

FIG. 10 is a schematic sectional view taken along line BB of FIG. 5;

FIG. 11 is an enlarged view of the rotating plate shown in FIG. 8;

FIG. 12 is an enlarged sectional view showing a handle according to a second embodiment of the present invention.

FIG. 13 is an enlarged cross-sectional view showing a handle similar to FIG. 12, showing a state in which a lock-off button is partially pushed in;

FIG. 14 is an enlarged cross-sectional view showing a handle similar to FIG. 12, showing a state in which a lock-off button is pushed to the end.

FIG. 15 is a diagram illustrating a positional relationship among a rotation plate, a lock plate, and a stopper plate corresponding to the state illustrated in FIG. 12;

FIG. 16 is a diagram illustrating a moving state of a rotation plate, a lock plate, and a stopper plate corresponding to the state illustrated in FIG. 13;

FIG. 17 is a view illustrating a moving state of a rotation plate, a lock plate, and a stopper plate corresponding to the state illustrated in FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Desktop cutting machine 2 ... Base 6 ... Cutting machine main body 7 ... Blade case 8 ... Circular saw blade 9 ... Handle 10 ... Safety cover 11 ... Motor 26 ... Operating link 26a ... Lock hole 35 ... Lock device 36 ... Rod 37 ... Lock Plate 38 ... Stopper plate 39 ... Lock pin 42 ... Stopper part 43 ... Switch 45 ... Trigger 46 ... Lock off button 47,147 ... Lock off lever 49 ... Compression coil spring 50 ... Rotating plate

Claims (1)

[Claims] 1. A cutting machine comprising a base on which a workpiece is placed and a cutting machine main body mounted to be tiltable in a vertical direction with respect to the base. A handle that makes a tilting operation, a drive motor that rotationally drives the rotary blade, and a blade case that partially covers the rotary blade,
A cover cover for covering the rotary blade exposed from the blade case and a safety cover movable to an exposed position for exposing the rotary blade, and a top dead center position of the cutting machine main body which is mounted to be tiltable with respect to the base. And an operating link for moving the safety cover from the cover position to the exposed position with respect to the rotary blade in accordance with the downward tilting of the cutting machine body, wherein the cutting machine body is tilted at the top dead center position of the cutting machine body. Locking means for locking operation and locking movement of the safety cover at the position are provided, and the handle is provided with a lock-off member for locking a trigger for starting and stopping the motor at a motor stop position. And a lock release operation of the lock means in conjunction with the trigger lock release operation of the lock-off member.