JP4847084B2 - Cutting machine - Google Patents

Description

  The present invention relates to a cutting machine such as a tabletop circular saw machine in which a turntable is mounted on a base so as to be horizontally rotatable, and a planar view angle of a cutting blade can be changed by rotating the turntable.

For example, a tabletop circular saw machine has a turntable that can be rotated horizontally on a base, an arm is provided behind the turntable, and the arm is provided with a disk-like saw blade (cutting blade) that is driven to rotate by a motor. The main body is provided in a state that it can be moved up and down by a support shaft and biased to the top dead center by a biasing means. Therefore, the material to be cut set on the base can be cut by lowering the main body. Note that “top dead center” refers to an upper limit position at which a main body that is not lowered is stopped, and “bottom dead center” described later refers to a lower limit position at which a main body that has been lowered is stopped.
In addition, the turntable has an operation knob projecting on the side surface on the front side, and by gripping this operation knob and turning it to an arbitrary angle, the turntable is horizontally rotated so that the angle of the saw blade seen in plan view is increased. It can be changed and positioned in the rotational direction by a separately provided positioning mechanism. Therefore, it is possible to perform so-called angle cutting in which the material to be cut is cut at an arbitrary angle in plan view. As this positioning mechanism, for example, as disclosed in Patent Document 1, an operation lever that can be inserted into a plurality of positioning holes provided in the base and is urged in the insertion direction is provided adjacent to the operation knob. It is known that the position of the turntable can be moved in the axial direction by changing the abutting position with respect to the stopper surface provided on the turntable by the rotation operation, and the positioning in the rotation direction of the turntable and the release thereof can be selected.

Japanese Patent No. 3283745

  In the tabletop circular saw, the rotating operation by the operating knob, the positioning in the rotating direction by the operating lever, and the releasing operation are separately required, so when rotating the turntable from the positioning state, The operation lever is released in the gripped state, and the operation knob is turned while the positioning is released. Therefore, the rotation operation of the turntable accompanying the angle cut becomes troublesome, leading to a decrease in operability and workability.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cutting machine in which a rotation operation including positioning and release of a turntable can be performed with a simple operation, and suitable operability and workability can be maintained.

In order to achieve the above object, according to the first aspect of the present invention , a turntable is placed on a base so as to be horizontally rotatable, and a main body having a cutting blade for rotationally driving can be moved up and down on the turntable. In addition, while being provided in a state of being biased to the top dead center, an operation member is provided outside the turntable, and the planar view angle of the cutting blade can be changed by gripping the operation member and rotating the turntable. It is a cutting machine, and the operation member is provided in a posture supported in the radial direction of the turntable, movable in the radial direction of the turntable, and biased toward the side of the base below the turntable. This is a rod member. By engaging the tip of the rod member with the engaged portion provided on the side surface of the base, the turntable can be positioned in the rotational direction while the rod member is biased. Anti was moved in the radial direction of the turntable, collision by disengaging from the engagement portion, thereby allowing the rotational operation of the turntable by the rod member to release the positioning, from the turntable by the rod member coaxially A receiving ring having an internal thread formed on the inner surface, a lock sleeve that is coaxially inserted into the rod member, screwed into the receiving ring, and capable of being screwed in the radial direction of the turntable, and a lock sleeve A push rod that moves in the radial direction of the turntable together with the lock sleeve according to the operation, and a pressing plate that is attached to the side surface of the turntable and hangs along the side surface of the base and presses the side surface of the base by the movement of the push rod. The push rod moves with the operation of the lock sleeve, and the push rod moves to move the push rod. By the plate presses the base side, the rotational operation of the turntable, the rod member is characterized in that it has a lockable at a position not engaged with the engaged portion.

According to the first aspect of the present invention, the turntable can be positioned and released, and further rotated by a simple operation of a single rod member. Therefore, the operability and workability related to angle cutting are improved.
In addition, the operability is improved by projecting the rod member to the outside of the turntable.
Furthermore, since the rotation operation of the turntable can be locked at a position where the rod member is not engaged with the engaged portion, the cutting angle can be finely adjusted, and the usability is further improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view of a tabletop circular saw machine, which is an example of a cutting machine, as viewed from the side. The tabletop circular saw machine 1 can horizontally rotate a turntable 3 having a circular shape in plan view in the approximate center of a base 2. The arm 4 is erected on the rear side of the turntable 3 (the left side in FIG. 1 is the rear side, the same applies hereinafter), and the main body 6 can be moved up and down by the support shaft 5 at an intermediate portion of the arm 4. It is attached to the shaft. The main body 6 is biased to the top dead center position in FIG. 1 by a torsion spring 7 provided on the support shaft 5 portion. Reference numeral 8 denotes a guide fence constructed in the left-right direction on the base 2 so as to cross the turntable 3.

  The main body 6 includes a blade case 9 having a motor (not shown), a disk-like saw blade 10 (cutting blade) that is covered by the blade case 9 and is substantially half on the oblique rear side at the top dead center, and rotated by the motor. A handle 11 for up and down operation and a safety cover 12 that is attached to the blade case 9 and can cover the exposed portion (work release portion) of the saw blade 10 are provided. The safety cover 12 is attached so as to be rotatable around the shaft 13 from the outside of the blade case 9, and is rotated to a position covering the exposed portion of the saw blade 10 at the top dead center as shown in FIG. It is energized. Reference numeral 14 denotes a link plate that is installed between the tip of the arm 4 and the eccentric position of the safety cover 12 from the shaft 13 and rotates the safety cover 12 in the exposure direction of the saw blade 10 in conjunction with the lowering of the main body 6. .

On the other hand, as shown in FIG. 2, a blade edge plate 15 through which the lowered saw blade 10 passes is provided on the upper surface of the turntable 3, and a rectangular shape is formed on the extension line of the blade edge plate 15 on the side surface of the turntable 3. The extending portion 16 is projected. Reference numeral 17 denotes a central plate of the base 2 that is formed in a ring shape that is slightly larger than the turntable 3 and supports the turntable 3, and a scale 18 is engraved on the upper surface.
As shown in FIG. 3, the extending portion 16 is a box-like body that protrudes in the radial direction of the turntable 3 across the center board 17 and is released on the lower surface side. An operating rod 19 as an operating member is provided here. It has been. The operating rod 19 has a two-stage diameter having a small-diameter portion 20 at the rear end and a large-diameter portion 21 at the front end thereof, and is a shaft body coaxially connected to the front end, and extends to the large-diameter portion 21. By passing through the front wall 23 of the portion 16 and through the pin holder 25 screwed to the rear wall 24 of the extended portion 16 through the small diameter portion 20, the turntable 3 is supported so as to be movable back and forth in the radial direction. . However, since the large-diameter portion 21 is provided with a coil spring 27 between the pin-coupled spring holder 26 and the front wall 23, the operating rod 19 is retracted so that the large-diameter portion 21 contacts the pin holder 25. It is urged backward to the position. In this retracted position, the tip of the small diameter portion 20 protrudes rearward from the pin holder 25.

  On the side surface of the central disc 17 located on the protruding side of the small diameter portion 20, notches 28, 28... As the engaged portions that can be engaged with the small diameter portion 20 at the retracted position of the operation rod 19 are scale 18. A plurality of positions are formed in accordance with the predetermined positions. That is, when any of the cutout portions 28 is located on the extension line of the operation rod 19, the small diameter portion 20 of the operation rod 19 urged rearward is engaged, and the turntable 3 is connected via the extension portion 16. It will be positioned in the direction of rotation. It should be noted that the small-diameter portion 20 of the operating rod 19 always engages with the notch 28 at the position of the right-angle cutting in FIG. 1 where the saw blade 10 is orthogonal to the guide fence 8 in plan view.

  In addition, a receiving ring 29 in which the operating rod 19 is loosely inserted on the front surface of the front wall 23 in the extending portion 16 and an internal thread is formed on the inner surface protrudes coaxially with the operating rod 19 and is locked to the receiving ring 29. A sleeve 30 is attached. The lock sleeve 30 is a cylindrical body that is loosely coaxially inserted into the operation rod 19 and is attached to the extended portion 16 by screwing the small-diameter male screw portion 31 projecting at the center of the rear surface with the receiving ring 29. A washer 32 is provided around the male screw portion 31 on the rear surface of the lock sleeve 30. On the other hand, a push rod 33 parallel to the operation rod 19 is loosely inserted in the front wall 23 and the rear wall 24 slightly above the operation rod 19 so as to be movable in the axial direction, and the front end is attached to the washer 32 of the lock sleeve 30. The rear end is screwed to the side surface of the turntable 3 and the lower end is brought close to the pressing plate 34 that hangs down along the side surface of the center board 17.

  Therefore, when the lock sleeve 30 is rotated in the direction in which the lock sleeve 30 is screwed into the receiving ring 29, the washer 32 comes into contact with the push rod 33 to retract the push rod 33 as the lock sleeve 30 is retracted, and the central plate is connected via the pressing plate 34. 17 side surfaces are pressed. For this reason, the extension part 16 is fixed in the said position, and rotation of the turntable 3 is locked. On the other hand, when the lock sleeve 30 is rotated in the loosening direction, the lock sleeve 30 moves forward to release the push rod 33, so that the turntable 3 is allowed to rotate.

In the desktop circular saw machine 1 configured as described above, when the handle 11 is gripped from the top dead center of FIG. 1 and the main body 6 is pushed down, the main body 6 rotates downward about the support shaft 5. At this time, the link plate 14 rotates downward together with the main body 6 to rotate the safety cover 12 counterclockwise against the rotation bias and expose the lower portion of the saw blade 10, so that the turntable 3 is exposed as shown in FIG. 4. The workpiece W set above can be cut with the exposed saw blade 10. In this case, since the saw blade 10 descends perpendicularly to the guide fence 8, the material to be cut W pressed and positioned on the guide fence 8 is cut at right angles to the front surface of the guide fence 8.
When the pressing of the main body 6 is released after the cutting operation is completed, the main body 6 is rotated upward by the urging force of the torsion spring 7 of the support shaft 5, and the link plate 14 is also swung upward at the same time. Return to top dead center on the trajectory. Therefore, the safety cover 12 also rotates clockwise until it returns to the position shown in FIG. 1 by the urging of the torsion spring.

When the angle cutting is performed, the knob 22 of the operation rod 19 is gripped from the rotation-free state of the turntable 3 with the lock sleeve 30 loosened, and the operation rod 19 is pulled forward against the bias of the coil spring 27. Then, as shown in FIG. 1, the small diameter portion 20 is disengaged from the cutout portion 28 of the center board 17 to release the positioning of the turntable 3. Therefore, the operation rod 19 can be turned as it is, and the turntable 3 can be horizontally rotated in any direction left and right. Of course, the main body 6 also rotates horizontally.
After the turntable 3 is rotated by a predetermined angle with the scale 18 as a guideline, when the pulling of the operating rod 19 is released, the operating rod 19 is retracted by the bias of the coil spring 27, and the small diameter portion 20 corresponds to the notch portion at that position. 28 is engaged again to position the rotation of the turntable 3. Therefore, if the angle of the saw blade 10 with respect to the guide fence 8 is changed and the main body 6 is lowered in this state, the material to be cut can be cut obliquely at an angle obtained by rotating the turntable 3.

  In addition, when the angle other than the angle set by the notch 28 is selected, the small diameter portion 20 of the operation rod 19 released from the tension comes into contact with the side surface of the center board 17, so that the positioning by the operation rod 19 is not performed. When the lock sleeve 30 is screwed in and the central plate 17 is pressed by the push rod 33 and the pressing plate 34, the rotation of the turntable 3 can be locked even at this position. Therefore, it is possible to finely adjust the cutting angle between the notches 28, and the usability is improved.

As described above, according to the desktop circular saw machine 1 of the above-described form, the turntable 3 is positioned in the rotation direction at the engagement position of the turntable 3 with the notch portion 28 provided in the base 2 by being urged toward the base 2 side. By providing the operation rod 19 that can be rotated by rotating the turntable 3 by releasing the positioning from the notch 28 that resists urging, the turntable 3 can be turned only by a simple operation. The table 3 can be positioned and released, and further rotated. Therefore, the operability and workability related to angle cutting are improved.
In particular, here, the operating member is supported on the outside of the turntable 3 in the radial direction of the turntable 3 and is urged toward the side surface side of the center board 17, and the tip is provided on the center board 17 at the engagement position. By using the operation rod 19 (rod member) that engages with the portion 28, the operation table 19 protrudes from the front side of the turntable 3, and better operability is obtained.

The biasing of the operation member is not limited to the coil spring, and other biasing means such as a leaf spring may be employed. Moreover, it is not restricted to the urging | biasing by compression, It does not interfere with the tension | pulling urging | biasing by a tension spring etc.
On the other hand, the engaged portion is not limited to the cutout portion in the above form as long as it can be engaged with the operation member such as a through hole, a concave portion, or a rib protruding on the surface at a predetermined interval.
In addition to the rod-like body such as the operation rod in the above-described form, the operation member is engaged with the engaged portion by urging to the base side, and if the release operation against the urging is possible, the plate-like Other shapes such as a body can also be employed. Therefore, the present invention can be applied not only to a tabletop circular saw but also to other cutting machines such as cutters.

It is explanatory drawing which looked at the desk circular saw machine from the side (the body is top dead center). It is a perspective view of an operation rod part. It is the perspective view which looked at the operation rod part from the downward direction. It is explanatory drawing which looked at the desk circular saw machine from the side (the body is a bottom dead center).

Explanation of symbols

1 ・ ・ Desktop circular saw machine, 2 ・ ・ Base, 3 ・ ・ Turntable, 4 ・ ・ Arm, 5 ・ ・ Support shaft, 6 ・ ・ Main body, 9 ・ Blade case, 10 ・ ・ Saw blade, 16 ・ ・Extension part, 17 ... Central plate, 19 ... Operation rod, 20 ... Small diameter part, 21 ... Large diameter part, 22 ... Knob, 27 ... Coil spring, 28 ... Cutout part, 30 ... Lock sleeve .

Claims (1)

A turntable is placed on the base so as to be horizontally rotatable, and a main body having a cutting blade for rotationally driving is provided on the turntable so as to be movable up and down and biased to the top dead center. An operating member is provided on the outside, a cutting machine capable of changing the planar view angle of the cutting blade by gripping the operating member and rotating the turntable,
A rod provided in such a manner that the operating member is supported in the radial direction of the turntable, is movable in the radial direction of the turntable, and is biased toward the base side surface below the turntable. Is a member,
By engaging the tip of the rod member with the engaged portion provided on the side surface of the base, the turntable can be positioned in the rotation direction, while the rod member is resisted against the biasing and the turntable. In the radial direction of the, and disengaged from the engaged portion, the positioning is released and the turn member can be rotated by the rod member ,
A receiving ring that protrudes coaxially with the rod member from the turntable and has an internal thread formed on the inner surface thereof, is loosely inserted coaxially with the rod member, is screwed to the receiving ring, and is in the radial direction of the turntable A lock sleeve that can be screwed in, a push rod that moves in the radial direction of the turntable together with the lock sleeve in response to the operation of the lock sleeve, and a side surface of the base that is attached to a side surface of the turntable. A pressing plate that hangs down and presses the side surface of the base by the movement of the push rod;
The push rod is moved in accordance with the operation of the lock sleeve, and the push plate presses the side surface of the base by the movement of the push rod, so that the rotation operation of the turntable is performed, and the rod member is engaged with the engaged portion. A cutting machine characterized in that it can be locked even at a position where it is not engaged .

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