JP5184017B2 - Positioning device for rotary table in tabletop circular saw - Google Patents

Description

  The present invention relates to an apparatus for positioning a rotary table of a tabletop circular saw.

A so-called table-top circular saw is provided with a rotary table that can be horizontally rotated with respect to a base, and a cutting table on which the cutting material is placed, and a cutting machine body that can be moved up and down with respect to the rotary table. Equipped with a structure that cuts the cutting material by rotating the cutting blade of the cutting machine while rotating the cutting blade, and adjusting the rotational position of the rotary table to the cutting blade relative to the end of the cutting material There is provided a configuration that can cope with so-called oblique cutting in which the material is obliquely cut at various angles.
The tabletop circular saw machine corresponding to this oblique cutting is provided with a device for positioning the rotary table at a right angle cutting position or an arbitrary rotational position, and various techniques have been provided for this purpose. As a generally used positioning device, an operation handle for rotational operation provided on the side of the rotary table via a screw shaft portion can be rotated around the shaft and brought into contact with the side wall portion of the base. A first positioning mechanism that fixes the rotation position of the rotary table, and a so-called positive lock mechanism that is provided with a positioning pin that can be inserted into and removed from a plurality of positioning holes that are provided on the base side at fixed angles. A device having a second positioning mechanism is known. Further, for the latter second positioning mechanism among these two systems of positioning mechanisms, a technique that enables fine adjustment of each rotational position is disclosed in, for example, Patent Document 1 below.
The fine adjustment technique disclosed in Patent Document 1 finely adjusts the mounting position of the stopper member to be inserted into and removed from the positioning hole on the base side by adjusting the tightening amount of the adjusting screw, and determines the angular position of the rotary table in the rotational direction. It is configured to make fine adjustments.
U.S. Pat. No. 7,114,425 JP 2006-44220 A

As described above, the conventional fine adjustment mechanism is configured to adjust the position of the stopper member by adjusting the tightening amount of the adjustment screw. Therefore, the adjustment operation is troublesome and the reference position is set in the fine adjustment range. Therefore, the operation of returning to a certain position (reference position) after fine adjustment is troublesome and takes time, and it is necessary to improve the operability of the fine adjustment mechanism in this respect.
The present invention improves the operability when finely adjusting each rotational position in a positioning device for positioning the rotational position of the rotary table in a table circular saw machine having a rotary table, and allows easy operation after fine adjustment. It is an object to be able to return to a certain reference position.

For this reason, the present invention is a positioning device having the configuration described in each of the claims.
According to the positioning device of the first aspect, the rotational position of the rotary table relative to the base is positioned by moving the positioning member to the positioning position and engaging with the base. Conversely, when the positioning member is moved to the positioning release position to release the engagement state with the base, the rotary table becomes rotatable and can be moved to another rotation position.
The positioning member is supported by a support member attached to the rotary table so as to be movable between the positioning position and the positioning release position. The support member is supported so that its position can be adjusted in the rotation direction of the rotary table. Therefore, by adjusting the position of the support member in the rotational direction of the rotary table, the position of the positioning member in the rotational direction of the rotary table can be finely adjusted. As a result, the rotational position (positioning position) of the rotary table relative to the base can be finely adjusted. Can be adjusted.
The support member includes a reference fixing member. When the reference fixing member is moved to the reference release position at each positioning position of the rotary table, the support member can move with respect to the position in the rotational direction of the rotary table, and thus the positioning member can be adjusted in the same direction. . By adjusting the position of the positioning member provided on the rotary table in the rotational direction of the rotary table, the relative engagement position of the rotary table with respect to the base, and the positioning position thereof, can be finely adjusted.
On the other hand, in the state where the reference fixing member is moved to the reference fixing position at each positioning position of the rotary table, the support member is fixed to the rotary table in the rotation direction of the rotary table. Is fixed to the reference position for the position in the same direction (reference position return function).
As described above, at each positioning position of the rotary table, after the reference fixing member is moved to the reference release position and the support member is moved to finely adjust the positioning position, the reference position can be set at the positioning position or another positioning position. When the fixing member is moved to the reference fixing position, the support member is returned to the fixed reference position with respect to the rotary table, and thus the positioning member is returned to the reference position.
Therefore, it is possible to easily perform fine adjustment of each positioning position of the rotary table as before by moving the reference fixing member to the reference release position, and positioning by moving the reference fixing member to the reference fixing position. The member can be easily returned to a certain reference position.
According to the reference position returning function, when performing the oblique cutting, the position of the positioning member is accurately and quickly adjusted when the position of the rotating table is finely adjusted and then the rotating table is returned to the right angle cutting position. The position of the tabletop circular sawing machine can be further improved.

According to the positioning device of the second aspect, the positioning pin as the positioning member provided on the rotary table is moved in the axial direction via the support member to rotate between the positioning position and the positioning release position. The table can be switched between a state in which the table is positioned with respect to the base and a state in which the table is rotatable. The support position of the positioning pin with respect to the rotary table can be moved by rotating the support member. By moving the position of the positioning pin with respect to the rotary table, the positioning position of the rotary table with respect to the base can be finely adjusted.
After the fine adjustment of the positioning pin, when the reference fixing member provided on the support member is returned to the reference fixing position, the support member is returned to the reference position, so that the finely adjusted positioning pin can be easily returned to the reference position.
According to the positioning device of the third aspect, the reference fixing pin as the reference fixing member is provided on the support member that supports the positioning member. When the reference fixing pin is moved in the axial direction and moved to the reference fixing position. The reference fixing pin is engaged with the rotary table, whereby the support member is fixed at the reference position with respect to the rotary table, and the positioning member is fixed at the reference position. When the reference fixing pin is moved in the axial direction and moved to the reference release position, the engagement state of the reference fixing pin with respect to the rotary table is released, so that the support member can be moved and the positioning member is moved to the reference position. Thus, the positioning position of the rotary table can be finely adjusted.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a tabletop circular saw 1 equipped with a positioning device 10 according to this embodiment. The tabletop circular saw machine 1 includes a base 2, a rotary table 3, and a cutting machine body 4. The embodiment described below is characterized by the positioning device 10 of the rotary table 3 with respect to the base 2, and the basic configuration of the tabletop circular saw 1 such as the cutting machine body 4 is the same as the conventional configuration. Although no particular change is required in the form, it will be briefly described below. In FIG. 1, the user is positioned on the right side of the tabletop circular saw 1 to perform cutting operations and various operations. In the following description, the left side in FIG. 1 is the front side, and the right side (user side) is the rear side, and various members and configurations are used in the front-rear direction.
The base 2 is a base installed on a work table or a floor surface, and a table rotation shaft 2a is provided on the upper surface thereof. The rotary table 3 is supported through the table rotary shaft 2a so as to be rotatable in the horizontal direction. A cutting material W is fixed on the rotary table 3. The cutting material W is fixed on the rotary table 3 while being positioned by the positioning wall 5. The positioning wall portion 5 is attached to the base 2 side, and is provided in a state of straddling the top of the table 3 with a slight gap. The cutting material contact surface 5 a of the positioning wall 5 coincides with the rotation center (table rotation shaft 2 a) of the turntable 3.
A table extension 8 that protrudes in a radial direction with a certain width is provided as a part of the rotary table 3 at the rear portion (front side as viewed from the user) of the rotary table 3. A blade edge plate 9 is attached from the upper surface of the table extension 8 to the vicinity of the center of rotation of the table 3. The blade edge plate 9 is provided with a blade edge 9a through which a saw blade passes. A positioning device 10 according to this embodiment is provided in the vicinity of the tip of the table extension 8.
A main body support 6 is provided at the front end of the turntable 3. The main body support portion 6 includes a support arm 6b extending upward in a curved state. The cutting machine body 4 is supported at the tip of the support arm 6b via a support shaft 6a so as to be tiltable up and down. The cutting machine body 4 includes a circular saw blade 7 that rotates using an electric motor (not shown in the figure) as a drive source. The periphery of the saw blade 7 is covered with a cover 4 a that opens and closes in conjunction with the vertical movement of the cutting machine body 4.

FIG. 2 shows details of the positioning device 10 according to the present embodiment near the tip of the table extension 8. The positioning device 10 includes two systems of positioning mechanisms 20 and 30 for positioning the rotational position of the turntable 3.
The first positioning mechanism 20 is operated by rotating the operation grip 21 supported so as to protrude further rearward (user side) from the tip of the table extension 8 around its axis. Similarly, the second positioning mechanism 30 is operated by tilting an operating lever 31 provided at the tip of the table extension 8 up and down.
The operation grip 21 of the first positioning mechanism 20 also functions as a handle that is gripped by the user when the rotary table 3 is rotated, and is fixed to the rear end portion of the fixed rod 22. The fixed rod 22 is supported through a rear wall portion 8a and a front wall portion 8b provided on the table extension portion 8 so as to be rotatable around its axis. The fixed rod 22 is inserted into a support hole 8d provided in the rear wall 8a so as to be rotatable about an axis and movable in the axial direction. A screw shaft portion 22 a is provided at the distal end portion (left end portion in FIG. 2) of the fixed rod 22. The screw shaft portion 22a is screwed into a screw hole 8c provided in the front wall portion 8b. For this reason, when the operation grip 21 is gripped and rotated in the screw tightening direction, the fixed rod 22 rotates around its axis, and the screw shaft portion 22a is screwed into the screw hole 8c. Moves to the base 2 side (front side, left side in FIG. 2). When the fixed rod 22 moves to the base 2 side, the tip of the fixed rod 22 is abutted against the side wall 2b of the base 2 with a protective plate 23 to be described later interposed therebetween. The turntable 3 is fixed to the base 2 in a non-rotatable manner by the front end of the fixed rod 22 being abutted against the side wall 2b of the base 2 by the tightening force of the screw shaft 22a. The rotational position of 3 is locked.
The side wall part 2b of the base 2 is provided along the circumference centering on the table rotating shaft 2a. A plurality of positioning holes 2c to 2c used in the second positioning mechanism 20 are provided in the side wall portion 2b at appropriate intervals in the circumferential direction.
The protection plate 23 is a steel plate bent in an L shape in a side view, and is fixed to a lower portion of the front wall portion 8b with a fixing screw 24 so as to rise upward along the front surface of the front wall portion 8b. The fixing rod 22 is abutted against the side wall 2b of the base 2 with the protective plate 23 sandwiched therebetween, thereby preventing the side wall 2b from being deformed or damaged.
The fixed rod 22 is inserted through the insertion hole 41a of the support member 41 supported along the rear surface of the front wall portion 8b. The support member 41 has a function of finely adjusting the rotational position positioned by the second positioning mechanism 30 and will be described later.

The second positioning mechanism 30 is a so-called positive lock mechanism, and has a function of positioning the rotary table 3 with respect to the base 2 at predetermined angular positions set in advance. The second positioning mechanism 30 is operated by a tilting operation of the operation lever 31. The operation lever 31 is bent substantially in an S shape (crank shape), and a tip portion thereof is supported by a lower portion of the front wall portion 8b via a support shaft 32. The operation lever 31 is tilted up and down around the support shaft 32. The positioning pin 33 is moved by the vertical tilting operation of the operating lever 31. The positioning pin 33 is supported in a state of being spanned between the rear wall portion 8a and the front wall portion 8b of the table extension portion 8. The positioning pin 33 is inserted between the support hole 8e provided in the rear wall portion 8a and the support hole 8f provided in the front wall portion 8b so as to be movable in the axial direction. Both the support holes 8e and 8f are formed in a groove shape along a certain arc with a width that allows the positioning pin 33 to be inserted therethrough. For this reason, the positioning pin 33 is movable between the rear wall portion 8a and the front wall portion 8b while being movable in the axial direction (front-rear direction) as well as being movable in the radial direction (left-right direction) as described above. It is supported across.
An engagement pin 34 is attached to a position near the center of the positioning pin 33 in the longitudinal direction. The engaging pin 34 is fixed in a state where the positioning pin 33 penetrates in the radial direction. For this reason, both end portions 34 a and 34 a of the engagement pin 34 are fixed in a state of protruding in the radial direction from the positioning pin 33. A compression spring 35 is interposed between the engagement pin 34 and the rear wall 8a. The compression pin 35 biases the positioning pin 33 toward the positioning position (left side in FIG. 2).
Further, as shown in FIG. 5, both end portions 34 a and 34 a of the engagement pin 34 are pressed against the operation inclined surfaces 31 a provided on the bifurcated portions 31 b and 31 b of the operation lever 31 by the urging force of the compression spring 35, respectively. ing. For this reason, when the operation lever 31 is tilted downward as shown in FIG. 6, the positioning pin 33 is moved to the compression spring 35 by the sliding action of both end portions 34a, 34a of the engagement pin 34 with respect to the both operation inclined surfaces 31a, 31a. Against the positioning release side (right side in FIG. 6). On the other hand, when the downward tilting operation of the operating lever 31 is released as shown in FIGS. 2 and 7, the operating lever 31 is returned upward by the indirect action of the compression spring 35 that has undergone the sliding action. As a result, the positioning pin 33 is moved to the positioning position side (leftward in FIG. 2) by the compression spring 35.

When the positioning pin 33 moves to the positioning position side, the tip portion thereof is inserted into the positioning hole 2c provided in the side wall portion 2b of the base 2, or abuts against the side wall portion 2b between the two adjacent positioning holes 2c, 2c. It is done. The tip of the positioning pin 33 is inserted into one of the positioning holes 2c, whereby the rotary table 3 is positioned at a certain angular position with respect to the base 2. In addition, when the rotary table 3 is rotated in either direction with the positioning pin 33 being abutted against the side wall 2b between the two adjacent positioning holes 2c, 2c, The rotary table 3 is positioned by being inserted into the positioning hole 2c.
According to the first positioning mechanism 20 and the second positioning mechanism 30 provided as described above, as a normal usage pattern, the fixed rod 22 is first retracted by rotating the operation grip 21 in the first positioning mechanism 20 and the front end thereof. The abutting state of the base 2 against the side wall 2b of the base 2 is released, so that the rotary table 3 can be rotated with respect to the base 2, and the operation lever 31 of the second positioning mechanism 30 is tilted downward in this state. When the positioning pin 33 is retracted, the tip end portion is extracted from the positioning hole 2c, so that the rotary table 3 can be rotated.
After rotating the rotary table 3 to a desired rotation angle position while holding the operation grip 21, when the tilting operation of the operation lever 31 is released, the positioning pin 33 is inserted into the positioning hole 2 c of the base 2 and The rotational position is positioned. When the positioning pin 33 is not directly inserted into the positioning hole 2c but is abutted against the side wall 2b between the two adjacent positioning holes 2c, 2c, the positioning pin 33 is adjusted by adjusting the rotational position of the rotary table 3. 33 can be inserted into the nearest positioning hole 2c. By inserting the positioning pin 33 into the positioning hole 2c, the rotary table 3 is positioned at a rotational position set in advance at appropriate angular intervals (positive lock).
In this way, in the positioning state by the second positioning mechanism 30, the operation grip 21 is rotated in the tightening direction so that the tip of the fixed rod 22 is brought into contact with the side wall portion 2b of the base 2 to be positioned at a certain position. The rotation position of the turntable 3 can be firmly fixed.
In addition, when the positioning rod 33 is abutted against the side wall 2b between two adjacent positioning holes 2c, 2c on the base 2 side, the fixing rod 22 is abutted against the side wall 2b by the tightening operation of the operation grip 21. The rotary table 3 can be fixed at an arbitrary angular position different from the preset angle.

Next, the positioning device 10 according to the present embodiment can further finely adjust the position of the rotary table 3 at each rotation position that is formed by inserting the positioning pins 33 into the positioning holes 2c of the base 2. .
As described above, the support member 41 is supported on the front wall portion 8 b of the extension portion 8. The support member 41 is supported so as to be rotatable in the left-right direction (the direction perpendicular to the paper surface in FIG. 2) via the fixed rod 22 inserted through the upper insertion hole 41a. In the case of the present embodiment, the axis of the fixed rod 22 corresponds to an embodiment of the rotation fulcrum described in the claims. That is, in the case of this embodiment, the support member 41 is provided so as to be able to rotate left and right with the axis of the fixed rod 22 as a rotation fulcrum.
A circular insertion hole 41d is provided substantially at the center of the support member 41 at a certain distance from the rotation fulcrum, and the positioning pin 33 is inserted into the insertion hole 41d so as to be movable in the axial direction. Yes. For this reason, as shown in FIG. 4, when the support member 41 is rotated left and right with the fixed rod 22 as a fulcrum, the positioning pin 33 moves in parallel along a trajectory along the circumference around the axis of the fixed rod 22. The support holes 8e and 8f of the table extension 8 are formed in a groove shape along an arc centering on the axis of the fixed rod 22, and thereby, the radial movement of the positioning pin 33 (accurately) Is allowed to translate along an arc centered on the axis of the fixed rod 22).
With the positioning pin 33 inserted into the positioning hole 2c, the support member 41 is rotated left and right to move the positioning pin 33 in the radial direction (the rotation direction of the rotary table 3). 2 The relative support position in the positioning mechanism 30 can be changed, and thereby the rotational position of the rotary table 3 relative to the base 2 can be finely adjusted. This fine adjustment position is fixed by tightening the fixing rod 22. Although the support member 41 itself does not include an original fixing means, the indirect fine adjustment position is fixed by fixing the rotary table 3 to the base 2 by tightening the fixing rod 22.
As shown in FIG. 4, on the left and right side portions of the support member 41, lever portions 41b and 41b for the user to operate with the fingertips when the support member 41 is rotated are in a state of protruding sideways. Is provided. The user can grip one or both lever portions 41b, 41b with his fingertips and rotate the support member 41 to the left and right, thereby the relative support position of the positioning pin 33 in the second positioning mechanism 30. Can be fine-tuned with a simple operation.
A holding plate 42 having appropriate elasticity is in contact with the rear surface of the support member 41 (the side surface on the near side as viewed from the user). The holding plate 42 regulates the displacement (rattle) of the support member 41 in the front-rear direction (the axial direction of the fixed rod 22). The holding plate 42 is fixed to the lower surface side of the table extension 8 by a fixing screw 43.

A reference fixing pin 50 is supported near the lower end of the support member 41 on the rotating front end side. The reference fixing pin 50 is supported in an axially movable state in an insertion hole 41 c provided in parallel with the insertion hole 41 d that supports the positioning pin 33. Opposing to the reference fixing pin 50, a reference fixing hole 51 is provided on the rear surface of the front wall portion 8 b of the table extension 8. As the reference fixing pin 50 moves back and forth in the axial direction, the tip end portion of the reference fixing pin 50 is inserted into and removed from the reference fixing hole 51.
When the fastening of the fixing rod 22 is released and the fixed state of the rotary table 3 with respect to the base 2 by the first positioning mechanism 20 is released, the support member 41 can be rotated. In this state, when the reference fixing pin 50 moves forward in the axial direction and the tip portion thereof is inserted into the reference fixing hole 51, the support member 41 is unable to rotate left and right and is fixed at the reference position. On the other hand, as shown by a two-dot chain line in FIG. 3, when the reference fixing pin 50 retreats in the axial direction and its tip is extracted from the reference fixing hole 51, the support member 41 can be rotated left and right. As described above, the position of the positioning pin 33 can be finely adjusted.
The rear portion (front side as viewed from the user) of the reference fixing pin 50 protrudes rearward from the support member 41, and this protruding portion engages with a switching lever 53 for moving the reference fixing pin 50. Has been. The switching lever 53 has a substantially cylindrical body shape, and as shown in FIG. 3, the switching lever 53 extends in the axial direction (vertical direction in FIG. 3) between the left and right side walls 8 g and 8 h of the table extension 8. It is supported so that it can be moved.
A slot 53a that allows the reference fixing pin 50 to move in both the axial direction and the radial direction is formed in the center portion in the longitudinal direction of the switching lever 53 so as to penetrate in the front-rear direction. As shown in FIG. 5, the slot 53 a is formed long in a certain range in the axial direction (operation direction) of the switching lever 53.
As shown in FIG. 3, a switching step portion is formed along the rear portion of the slot 53 a (the user side, the right side in FIG. 3) cut from the rear portion side of the switching lever 53. The stepped portion includes a V-shaped forward stepped portion 53b formed deep in the center in the longitudinal direction, and a shallower flat stepped-back stepped portion 53c provided on both sides (upper and lower sides in FIG. 3) of the forward stepped portion 53b. , 53c.
Both end portions of the engagement pin 54 are fitted into the step portions 53b and 53c. The engaging pin 54 penetrates in a radial direction at a position near the rear end portion of the reference fixing pin 50 and is fixed in a state in which both end portions protrude vertically in the radial direction. The both ends of the engaging pin 54 are fitted into the forward stepped portion 53b, whereby the reference fixing pin 50 is advanced leftward in FIG. 3, while the both ends of the engaging pin 54 are one backward stepped portion 53c. The reference fixing pin 50 is held in a position retracted to the right in FIG.
A compression spring 55 is interposed between the engagement pin 54 and the rear wall 8a. By this compression spring 55, the engaging pin 54 is urged in the direction of fitting into the stepped portion. In addition, the reference fixing pin 50 is urged by the compression spring 55 in the advancing direction and the tip portion thereof is inserted into the reference fixing hole 51.

As shown in FIG. 3, both end portions (left and right end portions) of the switching lever 53 in the longitudinal direction protrude from the left and right side walls 8 g and 8 h of the table extension 8, respectively. As shown by a two-dot chain line in FIG. 3, when one end of the switching lever 53 is moved in the pushing direction, the engaging pin 54 moves relatively on the stepped portion 53c for retreating of the switching stepped portion, and accordingly. The reference fixing pin 50 moves backward to the reference release position against the urging force of the compression spring 55. When the reference fixing pin 50 moves to the reference release position, the tip end portion is extracted from the reference fixing hole 51, and the support member 41 is in a rotatable state. FIG. 7 shows this reference position release state.
In this reference position release state, the positioning pin 33 is inserted into the positioning hole 2c of the base 2 as shown in the figure, and the support member 41 is rotated left and right with the fixed rod 22 as a fulcrum, thereby 2 The relative support position in the positioning mechanism 30 can be changed, and thereby the rotational position of the rotary table 3 relative to the base 2 can be finely adjusted. As described above, this fine adjustment position is fixed by tightening the fixing rod 22 of the first positioning mechanism 20. This also indirectly fixes the rotational position of the support member 41.
The finely adjusted rotational position can be easily returned to a preset reference position. In order to return the positioning position of the rotary table 3 to the reference position, the fixing rod 22 is loosened to release the positioning state by the first positioning mechanism 20, and then the switching lever 53 is returned in a state in which the support member 41 is substantially returned to the reference position by visual inspection. Move the end of the opposite side in the direction of pushing. Then, the engaging pin 54 is fitted into the forward stepped portion 53b of the switching stepped portion, so that the reference fixing pin 50 is advanced by the urging force of the compression spring 55 to reach the reference fixing position, and as a result, the tip portion thereof is the reference portion. The support member 41 is returned to the reference position by being inserted into the fixing hole 51 (fixed). FIG. 6 shows this reference position fixed state. When the support member 41 is returned to the reference position, the positioning pin 33 is accurately returned to a preset reference position within a finely adjustable range with respect to its radial position, and accordingly each positioning of the rotary table 3 with respect to the base 2 is performed. The position is returned to a certain reference angular position.

According to the positioning device 10 of the present embodiment configured as described above, in the second positioning mechanism 30, the rotary table is inserted by inserting the positioning pin 33 into any of the plurality of positioning holes 2c to 2c provided in the base 2. 3 can be positioned at any of a plurality of preset rotational positions (positive lock function). After the positioning by the second positioning mechanism 30 in this way, the rotary table 3 is firmly fixed to the positioned position by tightening the fixing rod 22 of the first positioning mechanism 20.
Further, according to the positioning device 10 of the present embodiment, in the state in which the fixed rod 22 of the first positioning mechanism 20 is loosened, the rotational position of the rotary table 3 positioned at any angular position by the second positioning mechanism 30 is further increased. Fine adjustment is possible (angular position fine adjustment function). According to this angle position fine adjustment function, the support member 41 that supports the positioning pin 33 is rotated left and right to move the positioning pin 33 in the radial direction (table rotation direction).
Furthermore, the positioning device 10 according to the present embodiment can easily return the position of the positioning pin 33 finely adjusted by the angle position fine adjustment function to the reference position (reference position return function). According to the reference position return function of the present embodiment, the switching lever 53 is operated to move the engaging pin 54 into the forward stepped portion 53b, whereby the tip of the reference fixing pin 50 is moved to the reference fixing hole 51. The positioning pin 33 can be easily returned to the reference position by being inserted into the support member 41 and returning the support member 41 to a certain reference position.
As described above, according to the positioning device 10 of the present embodiment, at each positioning position of the rotary table 3 by a so-called positive lock mechanism, the positioning position can be finely adjusted, and the conventional screw tightening amount is adjusted. It is possible to quickly and accurately return to a certain reference position with a simpler operation compared to the configuration, thereby improving the usability of this type of tabletop circular saw machine 1.

The embodiment described above can be implemented with various modifications. For example, the configuration in which the fixed rod 22 of the first positioning mechanism 20 is used together with the rotation center axis of the support member 41 is illustrated, but the support member 41 can be rotated via a support shaft provided separately from the fixed rod 22. It is good also as a structure to provide.
Moreover, although the structure which set the rotation fulcrum of the support member 41 to the upper part was illustrated, it is good also as a structure rotated with a lower part side or center part as a rotation fulcrum.
Furthermore, although the supporting member to rotate was illustrated, it is good also as a structure which adjusts the position of a positioning pin finely by making it translate along a table rotation direction (left-right direction).
Moreover, although the reference fixing pin 50 as the reference fixing member is provided on the support member 41 side and the reference fixing hole 51 into which the reference fixing pin 50 is inserted is provided in the front wall portion 8b of the turntable 3, the reference fixing member and the reference It is good also as a structure which arrange | positions a fixing hole reversely.
In addition, while a ball plunger as a reference fixing member is provided in the front wall portion 8b, a reference fixing hole is provided in the support member, and when the positioning pin and the support member are returned to the reference position, the ball plunger ball becomes the reference fixing hole. It is good also as a structure which fits elastically and a rotation table can be accurately and simply returned to a reference position.

1 is an overall side view of a tabletop circular saw machine provided with a positioning device according to an embodiment of the present invention. It is a longitudinal cross-sectional view of a table extension part, Comprising: It is a side view of a positioning device. It is a cross-sectional view of the table extension, and is a bottom view of the positioning device as seen from the direction of the arrow (3) in FIG. It is a longitudinal cross-sectional view of a positioning apparatus, Comprising: It is the (4)-(4) sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of a positioning device, Comprising: It is the (5)-(5) sectional view taken on the line of FIG. It is a side view of a positioning device. This figure shows a state in which the positioning pin is located at the positioning release position and the reference fixing pin is located at the reference fixing position. It is a side view of a positioning device. This figure shows a state in which the positioning pin is located at the positioning position and the reference fixing pin is located at the reference release position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Desktop circular saw machine 2 ... Base, 2a ... Table rotating shaft, 2b ... Side wall part, 2c ... Positioning hole 3 ... Rotary table 4 ... Cutting machine main body, 4a ... Cover 5 ... Positioning wall part, 5a ... Cutting material contact Surface 6 ... Main body support, 6a ... Support shaft, 6b ... Support arm 7 ... Saw blade 8 ... Table extension 8a ... Back wall, 8b ... Front wall, 8c ... Screw hole, 8d ... Support holes, 8e, 8f ... support holes 8g, 8h ... left and right side wall parts 9 ... blade edge plate, 9a ... blade edge 10 ... positioning device 20 ... first positioning mechanism 21 ... operation grip 22 ... fixed rod, 22a ... screw shaft part 30 ... second positioning mechanism 31 ... Operation lever, 31a ... Operation inclined surface 32 ... Support shaft 33 ... Positioning pin (positioning member)
34 ... engaging pin, 34a ... end 41 ... support member, 41a ... insertion hole, 41b ... lever part, 41c, 41d ... insertion hole 42 ... holding plate 50 ... reference fixing pin (reference fixing member)
51 ... Reference fixing hole 53 ... Switching lever, 53a ... Groove hole, 53b ... Advance stepped portion, 53c ... Reverse stepped portion 54 ... Engagement pin

Claims (3)

Positioning of the rotary position of the rotary table with respect to the base in a tabletop circular saw machine provided with a rotary table provided so as to be horizontally rotatable with respect to the base and a cutting machine body provided so as to be movable up and down with respect to the rotary table A device for performing
A positioning member provided on the rotary table so as to be movable between a positioning position and a positioning release position, and engaging the base at the positioning position to position the rotary table in the rotational direction with respect to the base;
A support member that supports the positioning member so as to be movable between the positioning position and the positioning release position, and moves in the rotation direction of the rotary table so as to adjust the position of the positioning member in the rotation direction. When,
The support member is provided so as to be movable between a reference fixing position and a reference release position, and is moved to the reference release position so that the support member can be moved in the rotation direction of the rotary table, while the reference fixing is performed. A reference fixing member that moves to a position and returns the support member to a fixed reference position with respect to the rotary table, and fixes the support member so that the support member cannot move in the rotation direction of the rotary table and fixes the positioning member to the reference position. A positioning device provided.   The positioning device according to claim 1, wherein the support member is rotatably supported on a side portion of the rotary table, and a positioning pin as the positioning member is spaced apart from the rotation fulcrum. Is supported so as to be movable between the positioning position and the positioning release position, and is rotated in the rotating direction of the rotating table to rotate the positioning pin in the rotating direction of the rotating table. Positioning device that can be adjusted in position. The positioning device according to claim 1, wherein the support member includes a reference fixing pin as the reference fixing member, and the reference fixing pin is moved in the axial direction to engage with the side portion of the rotary table. A positioning device that is combined with the reference fixed position while being separated from a side portion of the rotary table to be the reference release position.

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