JP7317625B2 - desktop cutting machine - Google Patents

Description

The present invention relates to a desktop cutting machine.

A table-top cutting machine is usually equipped with a turntable that can rotate horizontally with respect to a base, and the cutting machine body is supported by this turntable via a support arm. The work piece placed on the top plate surface that straddles the base and the turntable is cut by a cutting tool attached to the cutting machine body. Also, the support arm can be tilted with respect to the turntable. A user can orient the cutting tool at a desired angle with respect to the workpiece by inclining the support arm at a desired angle. A conventional cutting machine is provided with a lock mechanism for locking tilting of the support arm, and an operation lever for releasing tilting fixation is attached to the rear side of the support arm.

JP 2009-226529 A JP 2015-150633 A

A cutting machine described in Japanese Patent Application Laid-Open No. 2009-226529 is provided with a V-shaped operating lever for fixing tilting of the support arm. However, it is difficult for the user to operate the operating lever having such a shape from the front side of the cutting machine. In the cutting machine described in JP-A-2015-150633, the operation member is arranged at the end of the front side of the slide mechanism provided on the upper part of the support arm, so that the tilt fixing operation can be performed at hand. . However, the operation of the operation member is transmitted through the inside of the pipe member and the support arm that constitute the slide mechanism to the joint between the support arm and the turntable, so the structure is complicated. Therefore, it is desired to improve the operability of tilting and fixing the support arm by a simple structure that can be easily adopted even in a small cutting machine.

One aspect of the present invention is a desktop cutting machine comprising a table on which a material to be cut is placed, and a support arm attached to the table so as to be tiltable about a tilt axis. and a locking mechanism for locking tilting of the cutting machine body with respect to the table. and an operation lever for rotating, and by rotating the fixing member, the tilting of the cutting machine body with respect to the table can be locked. the lever arm having a radial extension extending radially outwardly with respect to the axis of rotation of the stationary member and a forward extension extending forwardly from the radial extension; There is a desktop cutting machine. This makes it easier for the user on the front side of the cutting machine to access the operating lever, resulting in good operability.

In some embodiments, the lever arms are two lever arms arranged at diametrically opposed positions with respect to the axis of rotation of the fixed member. This makes it easy to operate from either the left or right side of the support arm.

In some embodiments, the operating lever engages the fixed member via a spline formed along the direction of the rotation axis. Thus, even when the operation lever interferes with the support arm and the required amount of rotation cannot be obtained when locking or releasing tilting, the spline allows fine adjustment of the mounting angle of the operation lever with respect to the fixing member.

In some embodiments, the operating lever is slidably supported by the fixed member between an engaged position and a disengaged position, and the locking mechanism prevents the operating member from sliding beyond the disengaged position. By sliding the operating lever to the disengaged position, the spline is disengaged and the operating lever becomes rotatable with respect to the fixed member. As a result, the mounting angle of the operating lever with respect to the fixed member can be adjusted without completely removing the operating lever.

In some embodiments, the locking mechanism comprises a spring biasing the operating member towards the engaged position. As a result, after the mounting angle is adjusted, the operating lever can be easily returned to the state of engagement with the fixing member, which is convenient.

In some embodiments, the spline is an involute spline. As a result, the rotating motion of the operating lever is efficiently transmitted to the fixed member, and the durability of the spline is improved.

In some embodiments, the support arm has an upper part and a lower part offset forwardly with respect to the upper part, and the operating lever is arranged behind this lower part. As a result, the space in the front and rear of the support arm can be effectively used, and the rearward size of the cutting machine is suppressed.

In some embodiments, the forward extending portion of the operating lever extends further forward than the rear surface of the lower portion of the support arm. This makes it easier for the user on the front side of the cutting machine to access the operating lever, resulting in good operability.

In some embodiments, both side surfaces of the distal end of the radially extending portion of the operating lever are parallel. As a result, when the user rotates the operating lever, the user's finger is less likely to slip on the side surface, and a rotational force can be efficiently applied to the operating lever.

In some embodiments, the thickness of the forward extension of the operating lever decreases radially inward with respect to the rotation axis. As a result, interference with the support arm can be avoided as much as possible, and the rotatable angle of the operating lever can be increased.

In some embodiments, the operating lever has a recess leading from the rear surface of the radial extension to the interior of the forward extension. As a result, it is possible to suppress deterioration in the strength of the front end portion of the front extending portion while ensuring moldability when the operation lever is formed by injection molding of resin.

1 is a perspective view of a desktop cutting machine as one embodiment, viewed diagonally from the front left side; FIG. It is a left side view of a desktop cutting machine, and the cutting machine main body is lowered to the lower limit position. It is a left side view of a desktop cutting machine, and the cutting machine main body is lowered to the lower limit position and slid to the rear limit position. It is the perspective view which looked at the desktop cutting machine from the diagonally left front side, and the cutting machine main body is tilted to the right 45 degrees position. It is a rear view of a desktop cutting machine. It is the perspective view which looked at the rotation lock mechanism provided in the front protrusion part of a turntable from the diagonally lower left. FIG. 4 is a front view of the rotation lock mechanism, with the operating knob removed; FIG. 4B is a bottom view of the rotation lock mechanism, with the lock pin engaging a recess in the engagement plate of the base; FIG. 11 is a bottom view of the rotation lock mechanism, with the lock pin disengaged from the recess in the engagement plate of the base; FIG. 9 is a cross-sectional view of the rotation lock mechanism taken along line XX of FIG. 8 and viewed from the left; FIG. 9 is an enlarged cross-sectional view of the second rotation lock mechanism taken along line XI-XI of FIG. 8 and viewed from the left, with the unlocking lever in the lower locked position; FIG. 10 is an enlarged cross-sectional view of the second rotation lock mechanism, with the unlocking lever pulled up to the upper limit position; FIG. 11 is an enlarged cross-sectional view of the second rotation lock mechanism, in which the engagement release maintaining member is slid to the lock position while the lock release lever is pulled up to the upper limit position; FIG. 10 is an enlarged cross-sectional view of the second rotation lock mechanism, in which the lock release lever is released from being lifted while the engagement release maintaining member is slid to the locking position, and the tapered surface of the lock pin engages the engagement release holding member; It fits in the stop hole. FIG. 12 is a cross-sectional view of the second rotation lock mechanism of FIG. 11 taken along line XV-XV and viewed from the front side; FIG. 13 is a cross-sectional view of the second rotation lock mechanism of FIG. 12 taken along line XVI-XVI and viewed from the front side; FIG. 14 is a cross-sectional view of the second rotation lock mechanism of FIG. 13 taken along line XVII-XVII and viewed from the front side; 15 is a cross-sectional view of the second rotation lock mechanism of FIG. 14 taken along line XVIII-XVIII and viewed from the front side; FIG. FIG. 4 is an exploded perspective view of a tilt lock mechanism provided on the support arm; 6 is a cross-sectional view of the tilt lock mechanism taken along line XX-XX of FIG. 5; FIG. FIG. 8 is an exploded perspective view of a tilt lock mechanism as another embodiment; FIG. 4 is a cross-sectional view of the tilt lock mechanism, with the operating lever in the forward engaged position; FIG. 4 is a cross-sectional view of the tilt lock mechanism with the operating lever pulled to a rear, disengaged position;

Various embodiments of the present invention will be described below with reference to the drawings. Figures 1 to 5 show an overall table cutting machine 1, also called a slide circular saw, as one embodiment. The user performs the cutting work while standing on the right side of the desktop cutting machine 1. - 特許庁In the following description, the terms relating to the front and back of the components of the tabletop cutting machine 1 are based on the position of the user with respect to the tabletop cutting machine 1, and the front side as seen from the user is the front side (user side), and the back side is the rear side. and

As shown in FIGS. 1 to 5, the desktop cutting machine 1 includes a base 2, a turntable 3 attached to the base 2 so as to be horizontally rotatable, and a cutting machine main body 100 above the turntable 3. . The top plate surface 4b of the turntable 3 and the left and right top plate surfaces 4a of the base 2 are on the same plane. It is cut by a disk-shaped cutting tool 102 called a chip saw attached to the main body 100 . The cutting machine main body 100 can swing up and down, tilt left and right, and slide back and forth with respect to the turntable 3 . By swinging the cutting machine main body 100 downward, the cutting tool 102 can cut into the workpiece placed on the turntable 3 . By sliding the cutter main body 100 backward while cutting the cutting tool 102 into the workpiece, the workpiece can be cut backward.

[Cutter body]
A cutting machine main body 100 includes a disk-shaped cutting tool 102 for cutting a workpiece by rotation. The upper half circumference of the cutting tool 102 is covered with a fixed cover 103 , and the lower half circumference is covered with a movable cover 104 rotatably supported with respect to the fixed cover 103 . The movable cover 104 is opened and closed in conjunction with the vertical movement of the cutting machine body 100 . The movable cover 104 is closed when the cutting machine main body 100 is at the upper waiting position. As the cutting machine main body 100 is lowered from the standby position, the movable cover 104 is gradually opened, and when it reaches the lower limit position, the movable cover 104 is opened. When the movable cover 104 is opened, the lower portion of the cutting tool 102 is exposed, and the exposed lower portion cuts into the workpiece.

The housing of the cutting machine main body 100 includes an AC-powered electric motor 101 for rotating the cutting tool 102, a controller for controlling the operation of the electric motor 101, a cooling fan for cooling the controller, and the like. Rotational power output from the motor shaft of the electric motor 101 is transmitted through a speed reducer to a spindle 105 rotatably supported by the housing. The end of the spindle 105 protrudes into the fixed cover 103, and the cutting tool 102 is attached to this protruding portion. On the top of the fixed cover 103, there are provided a main handle 150 that the user grips when performing cutting work, and a carrying handle 154 that the user grips when carrying the desktop cutting machine 1. As shown in FIG. A switch lever 152 is arranged on the main handle 150 . When the switch lever 152 is pulled forward with the hand holding the main handle 150, the electric motor 101 is activated and the cutting tool 102 is rotated.

[Turntable]
The turntable 3 is horizontally rotatably supported via a rotary support shaft 5 provided substantially in the center of the base 2 . Positioning fences 6 for positioning the workpiece in the front-rear direction are provided on the base 2 so as to project the upper side of the turntable 3 toward the center from both left and right sides. By rotating the turntable 3, the orientation of the cutting tool 102 with respect to the workpiece positioned against the positioning fence 6 can be changed.

The turntable 3 is provided with a strip-shaped cutting edge plate 7 forming slots. The slot of the cutting edge plate 7 extends from the vicinity of the rotation center of the turntable 3 to the forward projecting portion 3b. Through this slot, the lower end of the cutting tool 102 can descend below the top plate surface 4b. The cutting edge plate 7 is arranged so that its upper surface is flush with the top plate surface 4 b of the turntable 3 . Under the cutting edge plate 7, there is a concave surface 8 (FIG. 11) curved downward when viewed from the front, and this concave surface 8 is a space recessed downward from the top plate surface 4b for receiving the lower end of the cutting tool 102. is formed. The concave surface 8 has a bottom portion 8b that is horizontal when viewed from the side and a front end portion 8a that slopes upward.

1 to 5, the turntable 3 is at the center position (angle position 0°). The turntable 3 can be rotated until the forward projection 3b hits the base 2, and the angular range is, for example, about 60 degrees left and right from the central position. An angular scale 9 for indicating the rotational position of the turntable 3 is displayed on the front portion of the base 2 . A circular portion 3 a of the turntable 3 is provided with a pointer portion 10 . The angular position of the turntable 3 can be confirmed by reading the position where the indicator 10 points to the angular scale 9 .

[Turntable Rotation Lock]
As shown in FIGS. 6 and 7, the turntable 3 can be locked in a fixed angular position with respect to the base 2 by using two rotation locking mechanisms 20,40. By using the first rotation lock mechanism 20, the turntable 3 can be locked at any angular position within the rotatable range. By using the second rotation lock mechanism 40, it is possible to quickly lock the turntable 3 at a predetermined angular position corresponding to a recess 51 (to be described later) (positive lock) It is also possible to lock using the first rotation lock mechanism 20 instead of 40). The predetermined angular position is set, for example, in increments of 10° within the rotatable range. Both the first and second rotation lock mechanisms 20 and 40 are provided from the front portion of the circular portion 3a (FIG. 1) of the turntable 3 to the forward protruding portion 3b, and the operation portion thereof is at the tip of the forward protruding portion 3b. placed centrally. The first rotation lock mechanism 20 can be locked and unlocked by rotating the operation knob 23 around its axis. The second rotation lock mechanism 40 can be locked and unlocked by moving the lock release lever 41 up and down.

[First Rotation Lock Mechanism]
As shown in FIGS. 6 and 10, the operation member 21 of the first rotation lock mechanism 20 includes a screw shaft portion 22 and an operation knob 23 integrally attached to the front side thereof. The operation knob 23 functions not only for locking the rotation, but also as a rotation operation member (handle) that the user grips when rotating the turntable 3 . The screw shaft portion 22 is screwed into a screw hole 25 of a front support 24 extending downward from the front portion of the turntable 3 . The operating member 21 advances and retreats in the axial direction by rotating around the axis of the screw shaft portion 22 . By the action of the screw shaft portion 22 and the screw hole 25, the operating member 21 is displaced rearward when rotated in the locking direction (clockwise when viewed from the front side), and moved forward when rotated in the unlocking direction (counterclockwise). Displace.

A horizontally rotatable transmission plate 26 is arranged behind the screw shaft 22 . The transmission plate 26 is made of a strip-shaped steel plate that is long in the left and right direction. The transmission plate 26 has a circular hole on the right side and an elongated hole on the left side, and is attached to the lower surface of the turntable 3 with fixing screws 27 and 28 passed through these holes, respectively. This left elongated hole allows the transmission plate 26 to rotate horizontally around the right fixing screw 27 .

The rear end of the screw shaft portion 22 contacts the front edge of the center portion of the transmission plate 26 . When the operating member 21 rotates in the locking direction and the screw shaft portion 22 is displaced rearward, the central portion of the transmission plate 26 is pushed rearward. The transmission plate 26 is pushed by the screw shaft portion 22 to rotate, and the left side portion is displaced rearward.

A transmission rod 29 is arranged on the rear side of the left side of the transmission plate 26 so as to extend in the front-rear direction. The transmission rod 29 is supported by a rod receiving portion 31 of a rear support 30 provided on the lower surface of the turntable 3 and a rear rod receiving member 32 so as to be displaceable in the axial direction (front-rear direction). The transmission rod 29 is arranged parallel to the screw shaft portion 22 with a shift to the left. The front end of the transmission rod 29 contacts the left side of the transmission plate 26 . Therefore, when the transmission plate 26 rotates and its left side is displaced rearward, the transmission rod 29 is pushed by the left side and is displaced rearward. The rearward displacement of the left side of the transmission plate 26 causes the rearward displacement of the transmission rod 29 .

A lock member 33 is arranged behind the transmission rod 29 . The lock member 33 is rotatably supported on the lower surface of the turntable 3 via a horizontal support shaft 34 . The lock member 33 has an L shape with an upper arm 35 extending upward from the support shaft 34 and a front arm 36 extending forward from the support shaft 34 . The rear end of the transmission rod 29 contacts the front surface of the upper arm 35 of the lock member 33 . Therefore, when the transmission rod 29 is displaced rearward, the upper arm 35 is pushed rearward and the lock member 33 rotates about the support shaft 34 toward the lock side.

When the upper arm 35 is pushed rearward and the lock member 33 rotates toward the lock side, the front arm 36 is displaced upward. An arc-shaped sandwiching plate 37 fixed to the base 2 is positioned above the front arm 36 . A rib 38 extending from the lower surface of the turntable 3 is positioned above the sandwiching plate 37 . When the lock member 33 rotates to the lock side, the front arm 36 is displaced upward to sandwich the sandwiching plate 37 between the front arm 36 and the rib 38 .

As described above, the rotational motion of the operating member 21 is converted into the clamping motion of the lock member 33 via the transmission plate 26 and the transmission rod 29, which are transmission members. The turntable 3 can be locked at an arbitrary angular position within a prescribed range because it is locked by sandwiching the sandwiching plate 37 of the base 2 extending continuously in the circumferential direction.

[Second Rotation Lock Mechanism]
As shown in FIGS. 6, 7, and 10, the lock release lever 41 of the second rotation lock mechanism 40 rotates up and down via a rotation shaft 42 attached to the lower surface of the turntable 3 at the rear. supported as possible. When viewed in the fore-and-aft direction, the pivot shaft 42 is arranged between the front support 24 and the rear support 30 . Further, the rotating shaft 42 is arranged above a lock pin 45 which will be described later. An operation portion 43 is provided on the front portion of the lock release lever 41 , on which the user puts his or her finger when pulling up the lock release lever 41 . The operating portion 43 is located below and behind the operating knob 23 . Therefore, the user can pull up the lock release lever 41 with a finger (for example, index finger) of the same hand while gripping the operation knob 23 with one hand.

As shown in FIGS. 6 , 11 and 12 , a lock pin 45 is linked to the lock release lever 41 via an engagement pin 44 on the front side of the rotation shaft 42 . The engagement pin 44 has a smaller diameter than the lock pin 45, penetrates the lock pin 45 in the left-right direction, and protrudes to both the left and right sides. The lock pin 45 is inserted through the support hole 46 of the front support 24 and the support hole 47 of the rear support 30, and is supported so as to be displaceable forward and backward. The unlocking lever 41 has an escape hole 48 which is vertically opened to allow the front support 24 to escape. The lock pin 45 passes through the rear wall of the relief hole 48 of the unlocking lever 41 and its front end protrudes into the relief hole 48 . The lock pin 45 is arranged in parallel with the threaded shaft portion 22 of the operation member 21 of the first rotation lock mechanism 20 described above while being displaced downward. Therefore, in the front side support 24, the support hole 46 through which the lock pin is inserted is located below the screw hole 25 into which the screw shaft is screwed.

The lock release lever 41 has a slope 49 facing upward on the front side. The slope 49 is located on the rear wall of the relief hole 48 in the center of the unlocking lever 41 . A compression spring 58 is passed through the lock pin 45 and held between the left and right projections of the engagement pin 44 and the rear surface of the front support 24 . The compression spring 58 urges the lock pin 45 rearward via the engagement pin 44, and the engagement pin 44 pushes the slope 49 rearward, thereby urging the lock release lever 41 downward (to the lock side). .

The unlocking lever 41 can be pulled up to the unlocking side against the compression spring 58 . When the lock release lever 41 is pulled up, the engagement pin 44 is pushed forward by the slope 49, and the lock pin 45 is displaced forward. When the pull-up force of the lock release lever 41 is released, the lock pin 45 is returned rearward by the biasing force of the compression spring 58 .

As shown in FIGS. 8, 9, and 10, an engaging plate 50 extending in an arc shape is attached to the base 2 at the same height as the lock pin 45, and a plurality of concave portions 51 are provided on the peripheral edge of the engaging plate 50. be done. When the lock pin 45 is displaced rearward and the rear tip enters one of the recesses 51, the lock pin 45 is held at the entering position (lock position) by the urging force of the compression spring 58, and the turntable 3 is held in the recess. The angle corresponding to 51 is locked. When the lock pin 45 is displaced forward and removed from the recess 51, the turntable 3 is unlocked and becomes rotatable.

The lock pin 45 has flat chamfered inclined surfaces 52 on the left and right sides of the rear end surface. As a result, when the tip of the lock pin 45 enters the recess 51 , the left and right inclined surfaces 52 come into contact with the left and right corners of the recess 51 . At this time, the inclined surface 52 of the lock pin 45 and the corner of the concave portion 51 are in contact (line contact) with two straight lines directed in the vertical direction on both the left and right sides. Therefore, compared with the case where the tip of the lock pin 45 is conically chamfered as in the usual chamfering of a cylindrical member, it is difficult for the lock pin 45 to exert a vertical force on the engaging plate 50, and the engaging plate 50 is less likely to bend.

[Engage release holding member]
As shown in FIGS. 11 to 18, the lock pin 45 can be held in the disengagement position by operating the disengagement holding member 53 with the operation button. As a result, the lock pin 45 can be kept separated from the concave portion 51 of the base 2, and the turntable 3 can be kept rotatable. The disengagement holding member 53 is generally constructed by integrally combining an upper slide shaft portion 54 and a U-shaped plate portion 55 suspended from the slide shaft portion 54 .

The slide shaft portion 54 is passed through the support holes 56 in the left and right side walls of the forward projecting portion 3b of the turntable 3 and supported so as to be slidable in the left-right direction. As a result, the engagement release holding member 53 can move in the left-right direction between the left release position and the right lock position. When viewed in the front-rear direction, the slide shaft portion 54 is arranged between the front end of the front projecting portion 3b of the turntable 3 and the front support 24. As shown in FIG. Describing the position of the slide shaft portion 54 (support hole 56) more precisely, it exists above the height of the horizontal bottom portion 8b of the concave surface 8 of the turntable 3 and in front of the inclined front end portion 8a of the concave surface 8. Placed in dead space. The slide shaft portion 54 is stepped with a small diameter portion at the right end. A compression spring 57 is passed through the small diameter portion of the slide shaft portion 54 and held between the large diameter portion and the right side wall of the front projecting portion 3 b of the turntable 3 . The compression spring 57 urges the disengagement holding member 53 to the left (disengagement position side). An operation button 59 is provided at the left end of the slide shaft portion 54 to be pressed when the user operates the disengagement holding member 53 . As will be described later, when the lock release lever 41 is at the upper limit position, the engagement release holding member can be moved rightward by pushing the operation button 59 . Since the operation button 59 is located on the rear left side of the operation knob 23, the user can press the operation button 59 with the thumb of the same hand while holding the operation knob 23 with the right hand.

A bottom portion of the U-shaped plate portion 55 extends in the left-right direction under the lock release lever 41 . Therefore, the plate portion 55 does not interfere with the lifting operation of the lock release lever 41 , while the bottom portion of the plate portion 55 defines the lower limit position (lock position) of the lock release lever 41 . Further, the plate portion 55 has an upright portion 60 extending upward from the bottom portion. When the lock release lever 41 is at the lower lock position, the upright portion 60 protrudes upward from the lock release lever 41 through the escape hole 48 in the center of the lock release lever 41 .

A locking hole 61 is formed in the standing portion 60 of the plate portion 55 . The locking hole 61 consists of a large circle portion 62 on the right side and a small circle portion 63 on the left side. . The upright portion 60 faces the front side of the front side support 24, and either the large circle portion 62 or the small circle portion 63 of the locking hole 61 is moved to the front side support 24 by moving the engagement release holding member 53 to the left or right. It can be coaxially aligned with the support hole. The lock pin 45 has a small-diameter portion 65 and a large-diameter portion 66 in front thereof by constricting near the front end thereof. The transition between the small diameter portion 65 and the large diameter portion 66 has a tapered surface 67 . The diameter of the large circle portion 62 of the locking hole 61 is larger than the diameter of the large diameter portion 66 of the lock pin 45, and when the lock release lever 41 is in the lower locking position, the large diameter portion 66 of the lock pin 45 extends into the locking hole. It is located within the great circle portion 62 of 61 . The passage width of the constricted portion 64 of the locking hole 61 is smaller than the diameter of the large diameter portion 66 of the lock pin 45 . Therefore, when the unlocking lever 41 is at the lower lock position, the engagement release holding member 53 cannot be moved to the locking position on the right side, and the operation button 59 cannot be pushed.

When the lock pin 45 is pulled forward by pulling up the lock release lever 41, the small diameter portion 65 of the lock pin 45 moves into the large circle portion 62 of the locking hole 61 (FIGS. 12 and 16). ). The passage width of the constricted portion 64 of the locking hole 61 is larger than the diameter of the small diameter portion 65 of the lock pin 45 . Therefore, when the lock release lever 41 is at the upper limit position, the engagement release holding member 53 can be moved to the locking position on the right side, and the operation button 59 can be pushed. As a result, the small diameter portion 65 of the lock pin 45 moves into the small circular portion 63 of the locking hole 61 (FIGS. 13 and 17). When the pull-up force of the lock release lever 41 is released when the engagement release holding member 53 is in the locked position, the lock pin 45 is pushed rearward by the biasing force of the compression spring 58, and the tapered surface 67 of the lock pin 45 is engaged. It fits into the small circular portion 63 of the stop hole 61 (Figs. 14 and 18). In this way, the tapered surface 67 is caught by the front edge of the small circular portion 63, thereby preventing further rearward movement of the lock pin 45. As shown in FIG. As a result, the lock pin 45 is held in a position separated from the recess 51 . The disengagement holding member 53 is always biased leftward by the compression spring 57, but since the passage width of the constricted portion 64 of the locking hole 61 is smaller than the diameter of the small circular portion 63, the tapered surface 67 is There is no slippage from the small circle portion 63 to the large circle portion 62. - 特許庁

When it is desired to rotate the turntable 3 by a large amount, the lock pin 45 is held at the disengagement position so as not to be locked at the predetermined angular position during rotation. To hold the lock pin 45 at the disengaged position, the disengagement holding member 53 may be used as described above, or the lock disengagement lever 41 may be continuously pulled up with a finger. Even when the first rotation lock mechanism 20 is used to fix the turntable 3 at a free angular position (for example, a position different from the predetermined angular position corresponding to the concave portion 51), the disengagement holding member 53 is can be used to hold the locking pin 45 in the disengaged position. Furthermore, it is necessary to unlock the turntable 3 when using a separately provided fine adjustment mechanism (operated by the fine adjustment knob 123 shown in FIG. 1) for finely adjusting the rotation angle of the turntable 3. , it is convenient to use the second rotation lock mechanism 40 to release and hold the lock.

The upright portion 60 of the disengagement retention member has a shoulder 68 on the right side that functions as a stop. When the lock release lever 41 is pulled up to the upper limit position and the operation button 59 is pushed in, the engagement release holding member moves to the right, and the shoulder 68 of it moves to the lower side of the right wall of the escape hole 48 of the lock release lever 41. come in. When the pull-up force of the lock release lever 41 is released, the lock release lever 41 descends, but it abuts against the shoulder 68 of the engagement release holding member 53 to prevent further descent. Thereby, the user can intuitively determine whether or not the rotation of the turntable 3 is locked by the second rotation lock mechanism 40 from the position of the lock release lever 41 .

When the lifting force of the lock release lever 41 is released, the lock release lever 41 is pushed downward by the biasing force of the compression spring 58 until the rearward movement of the lock pin 45 is blocked. When the locking pin 45 is prevented from moving backwards by the disengagement holding member, the biasing force of the compression spring 58 no longer acts on the unlocking lever 41 . However, since the lowering of the lock release lever 41 is blocked by the shoulder 68 of the engagement release holding member 53 at some point, when the second rotation lock mechanism is unlocked (when the turntable 3 is being rotated) , etc.), the lock release lever 41 is prevented from rattling up and down.

When the lock release lever 41 is pulled up again to the upper limit position while the lock pin 45 is held at the disengaged position, the lock pin 45 is pulled forward through the engagement pin 44 . As a result, the tapered surface 67 of the lock pin 45 is separated from the edge of the small circular portion 63 of the locking hole 61, and the biasing force of the compression spring 57 causes the engagement release holding member 53 to return to the left engagement release position. At this time, the small diameter portion 65 of the lock pin 45 slides out into the large circle portion 62 through the constricted portion 64 of the locking hole 61 . When the pull-up force of the lock release lever 41 is released, the lock pin 45 is displaced rearward by the biasing force of the compression spring 58 and comes into contact with the peripheral edge of the engagement plate 50 of the base 2 .

When it is desired to use the second rotation lock mechanism 40 to fix the turntable 3 at one of the predetermined angular positions, the unlocking lever 41 is pulled up to the upper limit position in this manner, thereby locking the lock pin 45 into the disengaged position. release the hold on When the turntable 3 is rotated, the rear tip of the lock pin 45 slides along the periphery of the engaging plate 50 of the base 2, and when any concave portion 51 comes behind the lock pin 45, the lock pin 45 is attached to the compression spring 58. It is further displaced rearward by the force and the tip enters the concave portion 51 . As a result, the turntable 3 is fixed at a prescribed angular position corresponding to the recess 51 thereof.

According to the above-described embodiment, the space above the lock pin 45 is utilized as a place for the rotation shaft 42 of the lock release lever 41, and the upper side of the screw shaft portion of the operation member 21 is substantially engaged. The structure is simple with only the slide shaft portion 54 of the mating release holding member. Therefore, by arranging the operation knob 23 relatively upward, the lock mechanism can be made compact in the vertical direction.

[Back and forth slide and vertical swing]
As shown in FIGS. 1 to 5, the cutting machine body 100 is supported by two slide bars 110 so as to be slidable back and forth. A support arm 70 extending upward is attached to the rear portion of the turntable 3 . The two slide bars 110 extend forward from the top of the support arm 70 in parallel with a space therebetween. The tips of the two slide bars 110 reach the upper center of the turntable 3 and are joined by a joining member 111 . A slider 112 is attached along two slide bars 110 so as to be slidable in the front-rear direction, and the cutting machine main body 100 is supported by the slider 112 . The slider 112 and the slide bar 110 allow the cutting machine body 100 to slide back and forth. The cutting machine main body 100 is supported by a supporting portion below the slider 112 via a swinging support shaft 113 so as to be capable of swinging up and down. The cutting machine main body 100 is urged upward toward the standby position by a torsion spring attached to the pivot shaft 113 .

[Tilt lock mechanism]
As shown in FIGS. 19 and 20, the support arm 70 is supported by the turntable 3 via a tilting shaft 71 so as to be tiltable in the horizontal direction. An arm support portion 3c is integrally provided on the rear side of the circular portion 3a (FIG. 1) of the turntable 3. As shown in FIG. The rear side of the arm support portion 3c has a cylindrical mating surface on the outer circumference, and the front side of the base end portion 72 of the support arm 70 has a complementary cylindrical mating surface on the inner circumference. The support arm 70 is rotatably supported by the arm support portion 3c via the tilting shaft 71 at the base end portion 72 thereof. As a result, the cutting machine main body 100 can be tilted left and right about the axis of the tilting shaft 71 . The vertical position of the axis of the tilting shaft 71 coincides with the position of the top plate surface 4b of the turntable 3 (FIG. 1). Insertion holes 73 and 74 are formed in the arm support portion 3c and the proximal end portion 72 of the support arm 70, respectively. The tilting shaft 71 is passed through these insertion holes 73 and 74 from the front side of the arm support portion 3c.

The tilting shaft 71 has a screw shaft portion 75 at its rear portion, and this screw shaft portion 75 protrudes rearward from the base end portion 72 of the support arm 70 . A mounting nut 76 is screwed onto the screw shaft portion 75 . A recess 72b is formed on the rear side of the base end portion 72, and when the mounting nut 76 is tightened onto the screw shaft portion 75, it is positioned at the bottom of this recess 72b. A notch (not shown) is provided in the peripheral wall 72a forming the insertion hole 74 of the support arm 70 . A detent pin 71a is passed through the tilting shaft 71, and the protruding portion of the detent pin 71a is arranged in the notch of the insertion hole 74, thereby preventing the tilting shaft 71 from tightening when the mounting nut 76 is tightened. Rotation is restricted. Therefore, the tilting shaft 71 cannot rotate with respect to the insertion hole 74 of the support arm 70, but can rotate with respect to the insertion hole 73 of the arm support portion 3c. When the mounting nut 76 is tightened, the arm support portion 3c and the support arm 70 are tightened together between the head portion 71b of the tilting shaft 71 and the mounting nut 76. As shown in FIG. The support arm 70 is pressed against the arm support portion 3c in the axial direction and is tiltably supported with respect to the arm support portion 3c by an appropriate axial force due to this tightening. On the other hand, since the tilting shaft 71 is rotatable with respect to the insertion hole 73 of the arm support portion 3c, when a lateral force is applied to the support arm 70, the support arm 70, together with the tilting shaft 71 and the mounting nut 76, supports the arm. It rotates around the axis with respect to the portion 3c. By using a hexagonal nut as the mounting nut 76, the user can disassemble and repair the desktop cutting machine 1 using a general tool such as a socket wrench at the site where the desktop cutting machine 1 is used. A thrust bearing 77 and washers 78a and 78b are interposed between the mounting nut 76 and the bottom surface of the recess 72b of the base end portion 72 for stabilizing the axial force.

The cutting machine body 100 can be fixed at any angular position (for example, a square cut position or an inclined position) by a tilt lock mechanism. A pedestal member 79 having a shaft hole is passed through the screw shaft portion 75 and arranged so as to block the recess 72 b of the base end portion 72 . A tilt fixing nut 80 is screwed onto the screw shaft portion 75 . When the tilt fixing nut 80 is tightened, the arm support portion 3c and (the base member 79 of) the support arm 70 are tightened together between the head portion 71b of the tilt shaft 71 and the tilt fixing nut 80. As shown in FIG. This axial force locks the tilting of the support arm 70 with respect to the arm support portion 3c. A thrust bearing 81 and a washer 82 are interposed between the mounting nut 76 and the rear surface of the base member 79 for stabilizing the axial force. When the tilt fixing nut 80 is loosened, the support arm 70 becomes tiltable again with respect to the arm support portion 3c.

The inner peripheral surface of the tilt fixing nut 80 is stepped, and a compression spring 83 is held between the tip of the tilt shaft 71 and the step surface of the tilt fixing nut 80 . The screw threads of the tilt fixing nut 80 and the screw shaft portion 75 of the tilt shaft 71 are compressed by the compression spring 83, and the axial rattling of the tilt fixing nut 80 is suppressed. When the support arm 70 is tilted, the tilting fixed nut 80 rotates following the tilting shaft 71 due to the friction of the screw thread caused by the compression spring 83 . As a result, even when the support arm 70 is suddenly tilted, the problem that the tightening force changes due to the rotation of the tilt shaft 71 relative to the tilt fixing nut 80 can be suppressed.

[Tilt lock lever]
A tilt fixing lever 84 is attached to the tilt fixing nut 80 to be operated by the user. The support arm 70 has a lower portion 70b including a proximal end 72 offset forwardly with respect to an upper portion 70a. The tilt fixing lever 84 is arranged on the rear side of the lower portion 70b, and is sized so as to fit on the front side of the rear surface of the upper portion 70a as a whole. As a result, the space in front of and behind the support arm 70 can be effectively used, and an increase in the size of the cutting machine toward the rear can be suppressed. The tilt fixing lever 84 has a metal annular member 86 fixed to the inner peripheral surface of a hole formed in the central mounting portion 85 by insert molding. A male spline 80a is formed on the outer peripheral surface of the tilt fixing nut 80 along the direction of the rotation axis, and a corresponding female spline 86a is formed on an annular member 86 inside the tilt fixing lever 84. . The tilt fixing lever 84 is inserted into the tilt fixing nut 80 so that the splines 80a and 86a are engaged with each other. Splines 80a, 86a are preferably involute splines. As a result, the torque transmission between the tilt fixing lever 84 and the tilt fixing nut 80 can be improved, and the durability of the splines 80a, 86a can be improved. The tilt fixing lever 84 is fixed to the tilt fixing nut 80 using a mounting screw 87 . When the mounting screw 87 is tightened to the tip surface of the tilt fixing nut 80 , the annular member 86 is sandwiched between the mounting screw 87 and the tilt fixing nut 80 , and the tilt fixing lever 84 is fixed to the tilt fixing nut 80 .

The tilt fixing lever 84 has two lever arms 88 arranged at opposite pole positions with respect to the rotation axis. Each lever arm 88 has a radial extension 89 extending radially outward from a central mounting portion 85 and a forward extension 90 extending forward from the radial extension 89. The forward extending portion 90 extends forward beyond the rear surface of the lower portion 70 b of the support arm 70 . This makes it easier for the user on the front side of the tabletop cutting machine to access the tilt fixing lever 84, resulting in good operability. The forwardly extending portion 90 of the lever arm 88 is generally of square cross-section but decreases in thickness inwardly by having two sloping surfaces 90a on its radially inner portion. As a result, interference between the lever arm 88 and the side surface of the support arm 70 can be avoided as much as possible, and the angle at which the tilt fixing lever 84 can be rotated can be increased. The radially extending portion 89 of the lever arm 88 has parallel side surfaces 89a at the tip. As a result, when the user rotates the tilt fixing lever 84, the user's fingers are less likely to slip on the side surface 89a, and a rotational force can be efficiently imparted to the lever arm 88. FIG. The lever arm 88 has a recessed lightening portion 88 a leading from the rear surface of the radially extending portion 89 to the inside of the forward extending portion 90 . As a result, it is possible to suppress a decrease in the strength of the front end portion of the forward extending portion 90 while ensuring moldability when the tilt fixing lever 84 is formed by injection molding of resin.

By removing the mounting screw 87 , the user can change the mounting angle (orientation of the lever arm 88 ) of the tilt fixing lever 84 relative to the tilt fixing nut 80 . By setting the pitch of the splines 80a and 86a to, for example, 10 degrees, the relative attachment angle of the tilt fixing lever 84 can be adjusted in increments of 10 degrees. By setting the amount of rotation of the tilt fixing lever 84 necessary to fix or release the tilt of the support arm 70 to less than half a turn, the lever arm 88 can be fixed or fixed to the extent that the support arm 70 does not come into contact with it. can be made releasable. The rotation range of the tilt fixing lever 84 changes due to loosening of the tightness of the internal mechanism over time, and the lever arm 88 may get caught on the side surface of the support arm 70, making it impossible to obtain the necessary amount of rotation. Even in such a case, the user can change the rotation range of the tilt fixing lever 84 to a range that does not hit the support arm 70 by adjusting the relative mounting angle of the tilt fixing lever 84 .

21 to 23 show a tilt lock mechanism as a second embodiment. In this embodiment, a tilt lock lever 84 is attached to the tilt lock nut 80 with a mounting screw 87 . However, the tip portion 80b of the tilt fixing nut 80 is extended, and the hole of the mounting portion 85 of the tilt fixing lever 84 is slidable in the axial direction along the tip portion 80b. Moreover, the mounting screw 87 has a collar-shaped stopper portion 87a. The tilt fixing lever 84 is biased forward by a compression spring 91 . The compression spring 91 is passed through the tip portion 80 b of the tilt fixing nut 80 and held between the annular member 86 inside the tilt fixing lever 84 and the stopper portion of the mounting screw 87 . When the tilting fixing lever 84 is pulled out and the compression spring 91 is compressed to the limit, further withdrawal of the tilting fixing lever 84 is restricted. When the tilt fixing lever 84 is pulled out to the disengaged position, the spline 86a (FIG. 20) of the tilt fixing lever 84 is removed from the spline 80a of the tilt fixing nut 80, and the tilt fixing lever 84 is rotatable about the axis. As a result, the user can change the mounting angle of the tilt fixing lever 84 relative to the tilt fixing nut 80 without removing the mounting screw 87 or completely removing the tilt fixing lever 84 from the tilt fixing nut 80 . can. When the splines 80a, 86a (FIG. 20) are engaged and the pull-out force of the tilt fixing lever 84 is released, the biasing force of the compression spring 91 holds the tilt fixing lever 84 at the engaged position.

[Right tilt switching lever]
When the tilt fixing lever 84 is loosened, the tilting fixation of the cutting machine main body 100 is released, and the support arm 70 can be freely tilted between the right angle position and the left 45 degree position. Specifically, as shown in FIGS. 19 and 20, a right angle stopper 121, a left 45-degree stopper, and a right 45-degree stopper are provided inside the support arm 70. FIG. The arm support portion 3c of the turntable 3 is provided with a projecting portion (not shown) extending rearward. When the support arm 70 tilts between the right angle position and the left 45 degree position, this protrusion moves between the right angle stop 121 and the left 45 degree stop. A right tilt switching lever 120 is attached so as to be slidable in the front-rear direction between a setting position and a release position. The right tilt switching lever 120 is arranged slightly to the left of the top surface of the rear portion of the turntable 3 . The right tilt switching lever 120 is urged toward the rear set position by a compression spring. The right angle stopper 121 interlocks with the right tilt switching lever 120 . When the right tilt switching lever 120 is pulled forward, the right-angle stopper 121 moves to the retracted position on the front side, and even if the support arm 70 tilts, the projecting portion does not come into contact with the right-angle stopper 121 . When it is desired to tilt the cutting machine main body 100 to the right side of the right angle position, the right angle stopper 121 is moved to the retracted position by pulling the right tilt switching lever 120 to the release position. As a result, the protruding portion of the arm support portion 3c can be freely moved between the left 45-degree stopper and the right 45-degree stopper, and the inclination angle of the cutting machine main body 100 can be changed from the left 45-degree position to the right 45-degree position. You can adjust within the range. When the cutting machine body 100 is on the right side of the vertical position, if the right tilt switching lever 120 is released and the cutting machine body 100 is tilted leftward from the vertical position even a little, the right tilt switching lever 120 moves backward. The right angle stopper 121 automatically returns to its original regulating position. When the tilt fixing lever 84 is tightened after tilting the cutting machine body 100 to a desired angle, the tilting of the cutting machine body 100 is fixed.

[Tilt stopper switching lever]
The tilt limit angle (45 degrees in the above description) can be switched to a further predetermined angle (eg, 46 degrees) by operating the tilt stopper switching lever 122 . The tilt stopper switching lever 122 is arranged above the front surface of the arm support portion 3c. The tilt stopper switching lever 122 is mounted so as to be rotatable between a set position and a release position with the longitudinal direction as a rotation axis, and is urged in the release direction (clockwise when viewed from the front) by a torsion spring. By rotating the tilt stopper switching lever 122 counterclockwise, the left 45-degree stopper and the right 45-degree stopper can be simultaneously moved to the retracted position. Then, when the projecting portion of the support arm 70 passes the left 45 degree position, it abuts on the left 46 degree stopper. After tilting to the left of 45 degrees to the left, the tilt stopper switching lever 122 is released, and when the cutting machine body 100 is tilted even slightly to the right from the position of 45 degrees to the left, the tilt stopper switching lever 122 automatically rotates clockwise. , and the left 45-degree stopper returns to its original position. Similarly, the protrusion of the support arm 70 abuts the right 46-degree stopper after passing the right 45-degree position. After tilting to the right of 45 degrees to the right, the tilt stopper switching lever 122 is released, and when the cutting machine body 100 is tilted even slightly to the left from the right 45 degrees position, the tilt stopper switching lever 122 automatically rotates clockwise. , and the right 45-degree stopper returns to its original position.

In the above embodiment, an example of a slide circular saw capable of cutting is explained by causing the cutting machine body to perform a combined operation of sliding back and forth and swinging up and down. A similar feature can be applied to a tabletop circular saw that does not have a sprocket and can cut only by up and down swinging motions.

Although the present invention has been described using specific embodiments, the present invention is not limited to these embodiments, and those skilled in the art can make various permutations and modifications without departing from the scope of the present invention. Improvements and modifications are possible.

1 Desk Cutting Machine 2 Base 3 Turntable 3a Circular Part 3b Forward Protruding Part 3c Arm Supporting Part 4 Mounting Surface 4a Top Plate Surface 4b Top Plate Surface 5 Rotating Support Shaft 6 Fence 7 Cutting Edge Plate 8 Concave Surface 8a Front End 8b Bottom 9 Angle scale 10 Pointer 20 First rotation lock mechanism 21 Operation member 22 Screw shaft 23 Operation knob 24 Front side support 25 Screw hole 26 Transmission plates 27, 28 Fixing screw 29 Transmission rod 30 Rear side support 31 Rod receiver 32 Rod receiving member 33 Lock member 34 Support shaft 35 Upper arm 36 Front arm 37 Sandwiching plate 38 Rib 40 Second rotation lock mechanism 41 Unlock lever 42 Rotating shaft 43 Operation part 44 Engagement pin 45 Lock pins 46, 47 Support hole 48 Relief hole 49 Slope 50 Engagement plate 51 Recess 52 Slope 53 Disengagement holding member 54 Slide shaft 55 Plate (suspension)
56 Support hole 57 Compression spring 58 Compression spring 59 Operation button 60 Standing portion 61 Locking hole 62 Large circle portion 63 Small circle portion 64 Constricted portion 65 Small diameter portion 66 Large diameter portion 67 Tapered surface 68 Shoulder portion 70 Support arm 70a Upper portion 70b Lower portion 71 tilt shaft 71a anti-rotation pin 71b head 72 base end 72a peripheral wall 72b recesses 73, 74 insertion hole 75 screw shaft 76 mounting nut 77 thrust bearings 78a, 78b washer 79 base member 80 tilt fixing nut 80a spline 80b tip 81 Thrust bearing 82 Washer 83 Compression spring 84 Tilt fixing lever 85 Mounting portion 86 Annular member 86a Spline 87 Mounting screw 87a Stopper portion 88 Lever arm 88a Lightening portion 89 Radial extending portion 89a Side surface 90 Forward extending portion 90a Inclined surface 100 Cutting Machine body 101 Electric motor 102 Cutting tool (chip saw)
103 Fixed cover 104 Movable cover 105 Spindle 110 Slide bar 111 Coupling member 112 Slider 113 Swing spindle 120 Right tilt switching lever 121 Right angle stopper 122 Tilt stopper switching lever 123 Fine adjustment knob 150 Main handle 152 Switch lever 154 Carrying handle

Claims (9)

A desktop cutting machine,
a table for placing the cut material;
a support arm tiltably mounted about a tilt axis with respect to the table;
a cutting machine body supported by the support arm;
a lock mechanism for locking tilting of the cutting machine body with respect to the table,
The lock mechanism includes a fixing member that can be pressed and fixed by rotating with respect to the support arm, and an operation lever for rotating the fixing member. The tilting of the machine body can be locked,
the operating lever is positioned behind the support arm and has at least one lever arm;
the lever arm has a radially extending portion extending radially outwardly with respect to the rotation axis of the fixed member; and a forwardly extending portion extending forwardly from the radially extending portion;
said support arm having an upper portion and a lower portion offset forwardly with respect to said upper portion, said operating lever being arranged behind said lower portion;
A desktop cutting machine , wherein the forward extending portion of the operating lever extends further forward than the rear surface of the lower portion of the support arm . A tabletop cutting machine,
a table for placing the cut material;
a support arm tiltably mounted about a tilt axis with respect to the table;
a cutting machine body supported by the support arm;
a lock mechanism for locking tilting of the cutting machine body with respect to the table,
The lock mechanism includes a fixing member that can be pressed and fixed by rotating with respect to the support arm, and an operation lever for rotating the fixing member. The tilting of the machine body can be locked,
the operating lever is positioned behind the support arm and has at least one lever arm;
the lever arm has a radially extending portion extending radially outwardly with respect to the rotation axis of the fixed member; and a forwardly extending portion extending forwardly from the radially extending portion;
The desktop cutting machine, wherein the front extending portion of the operating lever has a portion whose thickness decreases radially inward with respect to the rotation axis. The desktop cutting machine according to claim 1 or 2 ,
The tabletop cutting machine, wherein the lever arms are two lever arms arranged at opposite pole positions with respect to the rotational axis of the fixed member. The desktop cutting machine according to any one of claims 1 to 3 ,
A bench cutting machine, wherein the operating lever engages the fixed member via a spline formed along the direction of the axis of rotation. The desktop cutting machine of claim 4 ,
the operating lever is slidably supported by the fixed member between an engaged position and an disengaged position;
The lock mechanism has a stopper that prevents the operation lever from sliding beyond the disengagement position,
A desktop cutting machine, wherein the operation lever is disengaged from the spline by sliding the operation lever to an engagement release position, and the operation lever is rotatable with respect to the fixed member. The desktop cutting machine of claim 5 ,
A bench cutting machine, wherein the locking mechanism comprises a spring biasing the operating lever toward the engaged position. The desktop cutting machine according to any one of claims 4 to 6 ,
A tabletop cutting machine, wherein the spline is an involute spline. The desktop cutting machine according to any one of claims 1 to 7 ,
A desktop cutting machine, wherein both side surfaces of the tip of the radially extending portion of the operating lever are parallel. The desktop cutting machine according to any one of claims 1 to 8 ,
The operating lever has a recess leading from the rear surface of the radially extending portion to the inside of the forward extending portion.

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