Guide device for circular saw

Abstract

This invention provides a guide device for circular saws that can perform bevel cutting of a workpiece while minimizing the amount of waste material. [Solution] The circular saw guide device consists of a support portion 3 extending in a direction perpendicular to the direction of travel of the circular saw 2, and a first guide portion 4 provided at the tip of a bent portion 3a that is bent 180° from one end of the support portion, and having a first guide surface 8 that extends parallel to the direction of travel of the circular saw 2, with the support portion being attached to the front or rear of the base of the circular saw. The first guide portion 4 comprises a base portion 9 provided at the tip of the bent portion 3a, and a sliding portion 10 provided on the base portion so as to be slidable parallel to the direction of travel of the circular saw and having the first guide surface 8. The length of the base portion 9 from the bent portion 3a to the rear in the direction of travel of the circular saw is shorter than the length of the bent portion 3a to the front in the direction of travel of the circular saw, and the rear end of the base portion 9 in the direction of travel of the circular saw is located away from the tip of the saw blade in the direction of travel of the circular saw.

Description

[Technical Field]

[0001] The present invention relates to a guide device for a circular saw attached to an electric circular saw which is an electric power tool. [Background Art]

[0002] Conventionally, as shown in FIG. 29, a circular saw 100 for cutting a workpiece W such as wood is provided with a guide device 101. The guide device 101 consists of a support part 102 extending in a direction orthogonal to the traveling direction of the circular saw 100, and a guide part 104 having a guide surface 103 provided at the tip of a bent part 102a bent 180° from one end of the support part 102 and extending parallel to the traveling direction of the circular saw 100, and the support part 102 is attached to the front or rear part of a base 105 of the circular saw 100. In the circular saw 100, the cutting angle can be adjusted by inclining the surface of the saw blade 106 up to 45° to the right toward the traveling direction about a traveling direction axis 107, and the cutting depth can be adjusted by inclining the rear side of the saw blade 106 upward up to 45° about an axis 108 perpendicular to the traveling direction.

[0003] When cutting a workpiece W vertically using a circular saw 100 provided with such a guide device 101, the saw blade 106 is adjusted to be vertical, the saw blade 106 is aligned with the marking line iL, the guide surface 103 of the guide part 104 is brought into contact with the side surface of the workpiece W, and the circular saw 100 is pushed forward in the cutting direction while the guide part 104 is guided along the side surface of the workpiece W.

[0004] In addition, when cutting a workpiece W at 45°, as shown in FIG. 30, the saw blade 106 is adjusted to 45°, the saw blade 106 is aligned with the marking line iL, the guide surface 103 of the guide part 101 is brought into contact with the side surface of the workpiece W, and the circular saw 100 is pushed forward in the cutting direction while the guide part 104 is guided along the side surface of the workpiece W.

[0005] In this case, to reduce the amount of material to be cut off, the ink line iL should be brought close to the corner of the workpiece W, as shown in Figures 31, 32, and 33. However, as shown in Figure 34(a), if the line where the left side of the saw blade 106's kerf width in the direction of travel intersects with the top surface of the workpiece W passes through the corner of the workpiece W, a safety gap Sg is required between the right side of the saw blade 106's kerf width in the direction of travel and the upper end of the guide part 104. As a result, the guide part 104 moves away from the end face of the workpiece W, and therefore cannot guide the workpiece W. For this reason, as shown in Figure 34(b), if the guide part 104 is brought into contact with the end face of the workpiece W, the saw blade 106 must also be positioned away from the corner of the workpiece W. In this case, there was a problem of a large amount of material being cut off.

[0006] Patent Document 1 proposes a guide device in which the guide portion comprises a mounting member and a guide member, and the guide member is slidable in the cutting direction. However, in this guide device, the guide portion is positioned to the side of the saw blade regardless of whether the guide portion is positioned on the right or left side of the circular saw.

[0007] Patent Document 2 proposes a cutting width ruler in which the guide portion comprises a support member and a cutting width body having an engagement groove, and the cutting width body is slidable in the cutting direction. However, this cutting width ruler is used upside down so that the engagement groove is on the lower side when cutting thin plates and on the upper side when cutting thick plates, and the cutting width body slides only between two stoppers.

[0008] Patent Document 3 proposes a guide device in which the guide portion comprises a guide base material and a slide plate material, and the slide plate material is slidable in the cutting direction. However, in this guide device, the bolt member of the guide base material abuts against the end of the elongated hole in the slide plate material, thereby restricting the sliding range.

[0009] Thus, in all of the patent documents 1-3, a guide portion is present on the right side of the saw blade in the direction of travel, making it impossible to cut the workpiece at a 45° angle and reduce the amount of waste material.

[0010] Conventional circular saws have a maximum cutting angle of 45°, and it was not possible to cut at angles less than 45°. Furthermore, the guide section of conventional circular saws has a fixed height, making it unstable when guiding workpieces thicker than the guide section's height. Furthermore, with conventional circular saws, it was practically impossible to chamfer the corners of a workpiece because the guide could not be applied to the end face on the chamfering side. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Japanese Patent Publication No. 2008-030339 [Patent Document 2] Japanese Patent Publication No. 2010-047021 (Specification of Japanese Patent No. 4531849) [Patent Document 3] Japanese Patent Publication No. 2013-216066 (Specification of Japanese Patent No. 5599426) [Overview of the initiative] [Problems that the invention aims to solve]

[0012] This invention has been made in view of the aforementioned conventional problems, and aims to provide a circular saw guide device that can perform bevel cutting of a workpiece while minimizing the amount of waste material. It also aims to provide a circular saw guide device that can perform bevel cutting of 45° or less, can stably guide even thick workpieces, and can chamfer the corners of the workpiece. [Means for solving the problem]

[0013] The means to solve the aforementioned problem are as follows: (1) A circular saw guide device comprising a support portion extending in a direction perpendicular to the direction of travel of the circular saw, and a first guide portion provided at the tip of a bent portion bent 180° from one end of the support portion and having a first guide surface extending parallel to the direction of travel of the circular saw, wherein the support portion is attached to the front or rear of the base of the circular saw, The first guide section is, A base provided at the tip of the bent portion, The base is provided with a sliding part that is slidable parallel to the direction of travel of the circular saw and has the first guide surface, The base is formed such that the length from the bent portion to the rear in the direction of the circular saw's movement is shorter than the length from the bent portion to the front in the direction of the circular saw's movement, and the rear end of the base in the direction of the circular saw's movement is located away from the tip of the saw blade in the direction of the circular saw's movement.

[0014] In this mechanism, the length of the base from the bend to the rear in the direction of the circular saw's movement is shorter than the length from the bend to the front in the direction of the circular saw's movement, and the rear end of the base in the direction of the circular saw's movement is located away from the tip of the saw blade in the direction of the circular saw's movement. By sliding the sliding part, the rear end of the sliding part is brought close to the tip of the saw blade with a minimum safety gap, and then the support part is slid in a direction perpendicular to the direction of the circular saw's movement, so that the left corner of the rear end of the sliding part exceeds the thickness of the saw blade and aligns with the left end of the cut width. As a result, the guide surface of the first guide part comes into contact with the end face of the workpiece on the cutting side. In this state, by rotating the saw blade and pushing the circular saw along the corner of the workpiece, the workpiece W can be cut at 45° with minimal waste material.

[0015] (2) In the means (1) above, the sliding portion is provided with a sliding groove on the side opposite to the first guide surface, parallel to the direction of travel of the circular saw, extending from the front end to the rear end of the sliding portion, and the base portion is slidably housed in the sliding groove.

[0016] (3) In the means described in (1) or (2), a recess is formed between the front end portion and the rear end portion of the first guide surface of the sliding portion, and a guide piece is provided in the recess so as to be rotatable in a vertical plane parallel to the first guide surface, and protrude upward from the upper surface of the sliding portion or protrude downward from the lower surface of the sliding portion.

[0017] (4) In any one of the means described in (1) to (3), a second guide portion attached to a side of the support portion opposite to the bent portion and opposed to the first guide portion is provided.

[0018] (5) In the means described in (4), the second guide portion comprises: a mounting base detachably attached to the support portion, an arm portion extending parallel to the support portion from the mounting base, and a guide plate provided at a distal end of the arm portion, the guide plate being opposed to the first guide surface and having a second guide surface extending parallel to a traveling direction of a circular saw.

[0019] (6) In the means described in (4), the second guide portion comprises: a mounting base detachably attached to the support portion, an arm portion extending parallel to the support portion from the mounting base, and a roller provided at a distal end of the arm portion, the roller being opposed to the first guide surface and rolling in the traveling direction of the circular saw.

[0020] (7) In the means described in (6), the second guide portion further comprises: a holding portion detachably provided on the arm portion, a pair of arm portions located on both sides of the roller and extending parallel to the support portion from the holding portion, and a guide plate provided at distal ends of the pair of arm portions, the guide plate being opposed to the first guide surface and having a second guide surface extending parallel to the traveling direction of the circular saw.

[0021] (8) In the means described in (7), the holding portion is characterized in that: an elastic member is provided between the guide plate and the roller. [Effects of the Invention]

[0022] According to the present invention, it is possible to perform bevel cutting on a workpiece while minimizing the amount of waste material. Furthermore, it is possible to perform bevel cutting at angles of 45° or less, it can stably guide even thick workpieces, and it also has the advantage of being able to chamfer the corners of the workpiece. [Brief explanation of the drawing]

[0023] [Figure 1] A plan view of a circular saw fitted with a guide device for circular saws according to an embodiment of the present invention. [Figure 2] Perspective view of the guide device. [Figure 3] Decomposed perspective view of the first guide section. [Figure 4] Plan view of the first guide section. [Figure 5] Front view of the first guide section. [Figure 6] A side view of the first guide surface of the first guide section, seen from the side. [Figure 7] A side view of the first guide section, seen from the opposite side of the first guide surface. [Figure 8] Cross-sectional view along line AA in Figure 4. [Figure 9] Figure 5 shows a cross-sectional view of line BB. [Figure 10] Decomposed perspective view of the second guide section. [Figure 11] Plan view of the second guide section. [Figure 12] Cross-sectional view of line CC in Figure 11. [Figure 13] Figure 11 shows a cross-sectional view of the DD line. [Figure 14] Plan view of the guide device and the front of the circular saw during 90-degree cutting. [Figure 15] Figure 14 shows a front cross-sectional view of the guide device and circular saw, viewed from the rear side of the workpiece. [Figure 16] A side view showing the movable state of the guide piece of the first guide section. [Figure 17]Figure 14 shows a front cross-sectional view of the guide device and circular saw as seen from the rear of the workpiece, illustrating the guiding state by the guide piece when cutting thick plates (a), and a front cross-sectional view of the guide device and circular saw as seen from the rear of the workpiece, illustrating the guiding state by the guide piece when cutting thin plates (b). [Figure 18] A plan view of the guide device and the rear of the circular saw, showing the rear guide configuration. [Figure 19] A side view of the rear of the circular saw and the guide device showing the rear guide state. [Figure 20] Plan view (a) of the guide device and the front of the circular saw during a 45° cut, and enlarged cross-sectional view (b) of section X. [Figure 21] Figure 20 shows a front cross-sectional view of the guide device and circular saw, viewed from the rear side of the workpiece. [Figure 22] Figure 20 shows the guide device and a side cross-sectional view of the circular saw, as seen from the right side in the direction of the circular saw's movement. [Figure 23] A perspective view (a), a longitudinal section view (b), and a transverse section view (c) of a box made from sheet metal cut using the guide device and circular saw of this embodiment. [Figure 24] (a) A front cross-sectional view of the guide device and circular saw as seen from the rear of the workpiece during acute-angle cutting of 45° or less, and a front cross-sectional view of the workpiece as seen from the rear after cutting. [Figure 25] Front cross-sectional view of the guide device and circular saw, viewed from the rear of the workpiece during slicing (a) and slicing (b). [Figure 26] Plan view of the guide device and the front of the circular saw during chamfering. [Figure 27] Figure 25 shows a front cross-sectional view of the guide device and circular saw, viewed from the rear side of the workpiece. [Figure 28] Figure 25 shows the guide device and a side cross-sectional view of the circular saw, viewed from the right side in the direction of travel of the circular saw. [Figure 29] A perspective view showing the process of vertically cutting a workpiece using a conventional guide device. [Figure 30] A perspective view showing the process of cutting a workpiece at a 45° angle using a conventional guide device. [Figure 31]A plan view of the guide device and the front of the circular saw when cutting at a conventional 45° angle. [Figure 32] Figure 31 shows a front cross-sectional view of the guide device and circular saw, viewed from the rear side of the workpiece. [Figure 33] Figure 31 shows the guide device and a side view of the circular saw, as seen from the right side in the direction of the circular saw's movement. [Figure 34] A partially enlarged view of Figure 32, showing the positional relationship between the saw blade and the guide section. [Modes for carrying out the invention]

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0025] Figure 1 shows a circular saw guide device (hereinafter simply referred to as "guide device") 1 according to an embodiment of the present invention, and a circular saw 2 to which this guide device 1 is attached.

[0026] The circular saw 2 has a known structure comprising a circular saw body 2a having a saw blade 7 on a base 6, an angle adjustment screw 2b, a cutting depth adjustment screw 2c, and a top guide 2d.

[0027] As shown in Figure 2, the guide device 1 consists of a support part 3, a first guide part 4, and a second guide part 5. The support part 3 is inserted into an insertion hole 6a provided on the front part of the base 6 of the circular saw 2, or on the edges on both the front and rear parts, and fixed in the desired position with a fixing screw 3b.

[0028] The support portion 3 is made of metal and is formed in the shape of an elongated plate extending in a direction perpendicular to the direction of travel of the circular saw 2. One end of the support portion 3 is provided with a bent portion 3a that is bent downward at a 180° angle. The support portion 3 is preferably 12 mm wide and 400 mm long, but is not limited to these dimensions.

[0029] The first guide section 4 is made of metal, is provided at the tip of the bent portion 3a of the support section 3, and has a first guide surface 8 that extends parallel to the direction of travel of the circular saw 2. The first guide section 4 comprises a base portion 9 and a sliding portion 10.

[0030] As shown in Figure 3, the base 9 is an elongated plate-like structure extending parallel to the direction of travel of the circular saw 2, and is provided at the tip of the bent portion 3a, perpendicular to the base 6 of the circular saw 2. As shown in Figure 9, the length L1 from the center line of the tip of the bent portion 3a to the rear in the direction of travel of the circular saw 2 is shorter than the length L2 from the center line of the tip of the tip of the bent portion 3a to the front in the direction of travel of the circular saw 2. Also, the rear end of the base 9 in the direction of travel of the circular saw is located away from the tip of the saw blade 7 in the direction of travel of the circular saw 2. The base 9 is attached to the tip of the bent portion 3a at a position above the center in the height direction. The rear end of the base 9 in the direction of travel of the circular saw 2 coincides with the side surface of the bent portion 3a. An L-shaped reinforcing portion 11 is provided between the front end of the base 9 in the direction of travel of the circular saw 2 and the bent portion 3a. A through hole 12 is formed midway between the front and rear ends of the base 9 in the direction of travel of the circular saw 2.

[0031] The slide portion 10 is slidably mounted on the base portion 9 parallel to the direction of travel of the circular saw 2 and has a first guide surface 8. On the opposite side of the slide portion 10 from the first guide surface 8, a slide groove 13 is provided that extends from the front end to the rear end of the slide portion 10, parallel to the direction of travel of the circular saw 2. The base portion 9 is slidably housed in the slide groove 13. A recess 14 is formed between the front end and the rear end of the first guide surface 8 of the slide portion 10, and a guide piece 15 is provided in the recess 14 so as to be rotatable around a pivot shaft 16 in a vertical plane parallel to the first guide surface 8, and so as to protrude upward from the upper surface of the slide portion 10 or downward from the lower surface. An elongated hole 17 extending parallel to the direction of travel of the circular saw 2 is formed in the recess 14 of the slide portion 10. The pivot shaft 16 of the guide piece 15 has a male thread formed on it, and a fixing screw 18 is attached to its tip, passing through the elongated hole 16 and the through hole 12 of the base portion 9.

[0032] As shown in Figure 10, the second guide section 5 is mounted on the opposite side of the bent section 3a of the support section 3, facing the first guide section 4, and is movable along the support section 3 in a direction perpendicular to the direction of travel of the circular saw 2. The second guide section 5 consists of a combination of a roller guide 21 and a plate guide 22.

[0033] The roller guide 21 consists of a mounting base 23, an arm 24, and a roller 25. The mounting base 23 is wider than the support portion 3 and has a rectangular parallelepiped shape that is elongated in the longitudinal direction of the support portion 3. A rectangular cross-section through hole 26 is formed horizontally in the longitudinal direction of the mounting base 23, from the left end face to the right end face in the direction of circular saw movement, through which the support portion 3 is inserted, and a vertical screw hole 28 is formed on the upper surface toward the through hole 26 into which a fixing screw 27 is screwed. The arm portion 24 extends parallel to the support portion 3 from below the through hole 26 on the right end face of the mounting base portion 23 in the direction of circular saw movement. The roller 25 is rotatably mounted on a U-shaped frame 29 attached to the tip of the arm 24 by a support shaft 30, and is designed to roll in the direction of travel of the circular saw 2.

[0034] The plate guide 22 consists of a holding portion 31, a pair of arm portions 32, a guide plate 33, and an elastic member 34. The holding portion 31 has a U-shaped cross-section consisting of a bottom portion and both sides, and engaging portions 35 are formed at the upper ends of both sides to engage with the corners of the arms 24 of the roller guide 21. The holding portion 31 is detachably attached to the arms 24 of the roller guide 21 from below. A pair of arms 32 are located on both sides of the roller 25 of the roller guide 21 and extend parallel to the support portion 3 from both sides of the holding portion 31. The guide plate 33 is provided at the tip of a pair of arm portions 32, faces the first guide surface 8, and has a second guide surface 36 that extends parallel to the direction of travel of the circular saw 2. The guide plate 33 has a rounded shape 37 formed from the upper corner to the lower corner on the front or rear, or both, side of the direction of travel of the circular saw 2. The elastic member 34 is provided between a pair of arm portions 32, and between the guide plate 33 and the roller 25 of the roller guide 21.

[0035] The roller guide 21 can be used independently by inserting the support portion 3 into the through hole 26 of the mounting base portion 23 and fixing it in an appropriate position with the fixing screw 27.

[0036] The plate guide 22 can be used in combination with the roller guide 21, with the mounting base 23 of the roller guide 21 also serving as the mounting base for the plate guide 22. Specifically, the roller 25 of the roller guide 21 is inserted between the pair of arms 32 of the plate guide 22, the holding part 31 of the plate guide 22 is attached to the arms 24 of the roller guide 21, the support part 3 is inserted into the through hole 26 of the mounting base 23 of the roller guide 21, and then fixed in place with the fixing screw 27 to enable use.

[0037] Next, the operation when cutting a workpiece W using the guide device 1 according to an embodiment of the present invention will be described.

[0038] <Vertical cutting> As shown in Figures 14 and 15, when cutting a workpiece W vertically (90°), the cutting depth of the saw blade 7 is adjusted to match the thickness of the workpiece W using the depth adjustment screw 2c. Then, the 0° mark on the top guide 2d is aligned with the ink line iL on the workpiece W, and with the first guide surface 8 of the first guide section 4 of the guide device 1 in contact with the end face of the workpiece W on the cutting side, the saw blade 7 is rotated and the circular saw 2 is pushed forward along the ink line iL to cut the workpiece W.

[0039] When the workpiece W is a thick plate, as shown by the solid line in Figure 16, the guide piece 15 of the first guide section 4 is rotated downward and protrudes below the slide section 10, thereby increasing the guide width as shown in Figure 17(a), and allowing the thick plate to be guided stably. When the workpiece W is a thin plate, as shown by the dashed line in Figure 16, the guide piece 15 of the first guide section 4 is rotated upward and protrudes into the gap between the slide section 10 and the base 6, thereby increasing the guide width as shown in Figure 17(b) and allowing the thin plate to be guided stably.

[0040] <Rear guide> As shown in Figures 18 and 19, the guide piece 15 of the first guide section 4 can be used as a rear guide. In this case, the support section 3 of the guide device 1 is attached to the rear of the base 6 of the circular saw 2 so that the first guide section 4 is above the support section 3. Next, the slide section 10 of the first guide section 4 is slid backward, and the guide piece 15 is rotated downward so that it protrudes below the slide section 10 and aligns with the rear guide 2e. In this state, when the workpiece W is cut, the slide piece 15 enters the cutting groove G of the workpiece W, preventing the workpiece W from touching from side to side.

[0041] <45° cut> As shown in Figures 20, 21, and 22, when cutting a workpiece W at a desired angle (e.g., 45°), the angle adjustment screw 2b is used to tilt the circular saw body 2a and the saw blade 7 at 45° relative to the base 6, and the depth of the saw blade 7 is adjusted using the depth adjustment screw 2c to match the thickness of the workpiece W. Then, the 45° mark on the top guide 2d is aligned with the corner of the workpiece W. By cutting the workpiece W along the corner, the amount of waste material can be minimized and the workpiece W can be cut at an angle. This is possible by adjusting the sliding part 10 of the guide device 1 as follows.

[0042] First, as shown in Figure 20(b), the sliding part 10 of the first guide part 4 of the guide device 1 is slid forward in the direction of travel of the circular saw 2, bringing the rear end of the sliding part 10 close to the tip of the saw blade 7 with a minimum safety gap g in between. Next, the support part 3 is slid in a direction perpendicular to the direction of travel of the circular saw 2, so that the left corner k of the rear end of the sliding part 10 exceeds the thickness t of the saw blade 7 and aligns with the left end of the kerf width Wa. As a result, the guide surface 8 of the first guide part 4 comes into contact with the end face of the workpiece W on the cutting side. In this state, by rotating the saw blade 7 and pushing the circular saw 2 along the corner of the workpiece W, the workpiece W can be cut at 45° with minimal waste material.

[0043] By using the guide device 1 of this embodiment, it is possible to cut the board material at a 45° angle at its corners. For example, when creating a box B with dimensions of width x, depth y, and height z as shown in Figure 23, four board materials P1 with one side x and the other side y, and two board materials P2 with one side y and the other side z, can be used. By cutting the ends of these board materials at a 45° angle at the corners and joining them together, the board material can be processed efficiently with minimal waste, and the box can be manufactured.

[0044] <Sharp angle cuts of 45° or less> Conventional circular saws can be tilted to the right in the direction of travel using an angle adjustment screw, allowing for bevel cuts from 90° to 45°, but they could not cut at acute angles below 45°, such as 30°. The circular saw 2 of this embodiment can cut at angles below 45° as follows.

[0045] As shown in Figure 24, the workpiece W is positioned and fixed with the cutting side facing upwards. The angle adjustment screw 2b is used to tilt the circular saw body 2a and the saw blade 7 30° relative to the base 6, and the depth adjustment screw 2c is used to adjust the cutting depth of the saw blade 7 to match the thickness of the workpiece W. Here, if the thickness of the workpiece W is t, the cutting depth is represented as 2t. Next, the position of the top guide 2b corresponding to 30° between 0° and 45° is aligned with the corner of the workpiece W. By cutting the workpiece W along the corner, the amount of waste material can be minimized and the workpiece W can be beveled. This is possible by adjusting the sliding part 10 of the guide device 1 in the same way as for 45° cutting, as follows.

[0046] First, the sliding part 10 of the first guide part 4 of the guide device 1 is slid forward in the direction of travel of the circular saw 2, bringing the rear end of the sliding part 10 close to the tip of the saw blade 7 with a minimum safety gap g in between. Next, the support part 3 is slid in a direction perpendicular to the direction of travel of the circular saw 2, aligning the left corner k of the rear end of the sliding part with the left end of the saw blade's kerf width. As a result, the guide surface 8 of the first guide part 4 comes into contact with the end face of the workpiece W on the cutting side. In this state, by rotating the saw blade 7 and pushing the circular saw 2 along the corner of the workpiece W, the workpiece W can be cut at 30° with minimal waste material.

[0047] <Slicing> As shown in Figure 25, the circular saw 2 of this embodiment can perform slicing, in which a material of a predetermined thickness is sequentially cut by a 45° bevel cut. First, with the workpiece W guided from both sides by the first guide section 4 and the second guide section 5, the rectangular section Wc of the workpiece W is cut at a 45° angle and discarded. Since the corners of the workpiece W after cutting are acute angles of 45°, they get stuck in the gap between the base 6 of the circular saw 2 and the upper surface of the sliding part 10 of the first guide part 4, preventing them from being guided. Therefore, the guide piece 15 of the first guide part 4 is made to protrude upward as shown by the dashed line in Figure 16, to prevent it from getting stuck in the gap between the base 6 of the circular saw 2 and the upper surface of the sliding part 10 of the first guide part 4.

[0048] Next, the support part 3 is slid in a direction perpendicular to the direction of travel of the circular saw 2, so that it is separated by a predetermined pitch dimension from the left end of the kerf width of the saw blade 7. Here, if the kerf width of the saw blade 7 is Wa and the slice thickness is T, then the pitch dimension P is √2(Wa+T). Next, with the guide piece 15 placed against the cut corner of the workpiece W, the saw blade 7 is rotated, and the circular saw 2 is pushed along the corner of the workpiece W to cut the workpiece W at a 45° angle. By repeating this process, slices of material Ws of a predetermined thickness can be cut out sequentially. Furthermore, by attaching the second guide section 5 to the support section 3 and pressing the left end face of the workpiece W with the guide plate 33, it is possible to prevent the workpiece W from wobbling from side to side during the cutting of the slice material Ws, and to stably cut out slices Ws of a predetermined thickness. In addition, even if a strong force is applied to the guide plate 33 from the workpiece W during cutting, the elastic member 34 can absorb the impact.

[0049] <Chamfering> As shown in Figures 25, 26, and 27, the circular saw 2 of this embodiment can chamfer the corners of the workpiece W. First, the circular saw 2 is placed on the left side of the workpiece W in the direction of travel. The angle adjustment screw 2b is used to tilt the circular saw body 2a and the saw blade 7 at a 45° angle relative to the base 6. The depth of the cut of the saw blade 7 is then adjusted using the depth adjustment screw 2c to match the chamfer dimension of the workpiece W. Finally, the 45° mark on the top guide 2d is aligned with a position that is the chamfer dimension away from the left end face of the workpiece W.

[0050] Next, the support part 3 is attached to the base 6 so that the first guide part 4 of the guide device 1 faces upwards to the base 6, and the second guide part 5 is attached to the tip of the support part 3. The guide plate 33 of the plate guide 22 of the second guide part 5 is brought into contact with the left end face of the workpiece W. In this state, a chamfer C can be processed on the workpiece W by cutting while guiding the plate guide 22 along the left end face of the workpiece W. Since the guide plate 33 of the plate guide 22 has a rounded edge 37, it is possible to prevent the saw blade 7 from hitting the guide plate 33 of the plate guide 22.

[0051] If the left end face of the workpiece W is curved, the plate guide 22 may be removed and the roller 25 of the roller guide 21 may be brought into contact with the left end face of the workpiece W.

[0052] The present invention is not limited to the embodiments described above, and various changes and modifications can be made. For example, the roller guide 21 and plate guide 22 of the second guide section are held by engaging the engaging portion 35 of the holding portion 31 of the plate guide 22 with the arm portion 24 of the roller guide 21. However, a magnet may be provided at the bottom of the holding portion 31 to attract and hold the roller guide 21 with the arm portion 24.

[0053] Furthermore, although the plate guide 22 of the second guide section is designed to be used in combination with the roller guide 21, the plate guide 22 may also be provided with a mounting base similar to the mounting base 23 of the roller guide 21, so that the plate guide 22 can be used independently. [Explanation of symbols]

[0054] 1… Guide device 2... Circular saw 2a...Circular saw body 2b...Angle adjustment screw 2c... Depth adjustment screw 2D... Top Guide 2e... Rear guide 3...Support part 3a...Bending part 3b… Fixing screw 4…First Guide Section 5…Second Guide Section 6…Bass 6a…Insertion hole 7...Saw blade 8…First guide surface 9...Base 10...Slide part 11…Reinforcement 12…Through hole 13...Slide groove 14…recess 15… Guide piece 16...Spindle 17…Long hole 18… Fixing screws 21…Laura Guide 22…Plate guide 23…Mounting base 24...Arm 25...Laura 26…Through hole 27… Fixing screws 28... screw holes 29...frame 30…Spindle 31...Holding part 32…A pair of arms 33... Guide plate 34…Elastic member 35...Engaging part 36…Second guide surface 37... roundness

Claims

1. A circular saw guide device comprising a support portion extending in a direction perpendicular to the direction of travel of the circular saw, and a first guide portion provided at the tip of a bent portion bent 180° from one end of the support portion and having a first guide surface extending parallel to the direction of travel of the circular saw, wherein the support portion is attached to the front or rear of the base of the circular saw, The first guide section is, A base provided at the tip of the bent portion, The base is provided with a sliding part that is slidable parallel to the direction of travel of the circular saw and has the first guide surface, The guide device for a circular saw is characterized in that the base portion is formed such that the length from the bent portion to the rear in the direction of travel of the circular saw is shorter than the length from the bent portion to the front in the direction of travel of the circular saw, and the rear end of the base portion in the direction of travel of the circular saw is located away from the tip of the saw blade in the direction of travel of the circular saw.

2. The guide device for a circular saw according to claim 1, characterized in that the sliding portion has a sliding groove on the opposite side of the first guide surface that extends from the front end to the rear end of the sliding portion parallel to the direction of travel of the circular saw, and the base portion is slidably housed in the sliding groove.

3. A recess is formed between the front and rear ends of the first guide surface of the slide portion, and a guide piece is rotatable in the recess in a vertical plane parallel to the first guide surface, and The circular saw guide device according to claim 1, characterized in that it is provided so as to protrude upward from the upper surface of the sliding portion or downward from the lower surface.

4. A guide device for a circular saw according to any one of claims 1 to 3, characterized in that a second guide portion is provided which is attached to the support portion on the opposite side of the bent portion and which faces the first guide portion.

5. The second guide section is, A mounting base which can be detachably attached to the support portion, An arm portion extending parallel to the support portion from the mounting base, The circular saw guide device according to claim 4, further comprising a guide plate provided at the tip of the arm, facing the first guide surface and having a second guide surface that extends parallel to the direction of travel of the circular saw.

6. The second guide section is, A mounting base which can be detachably attached to the support portion, An arm portion extending parallel to the support portion from the mounting base, The circular saw guide device according to claim 4, further comprising a roller provided at the tip of the arm, facing the first guide surface, and rolling in the direction of travel of the circular saw.

7. The second guide section is, A retaining part detachably provided on the arm, A pair of arms are located on both sides of the roller and extend parallel to the support portion from the holding portion, The circular saw guide device according to claim 6, further comprising a guide plate provided at the tip of the pair of arms, facing the first guide surface and having a second guide surface that extends parallel to the direction of travel of the circular saw.

8. The circular saw guide device according to claim 7, characterized in that an elastic member is provided between the guide plate and the roller.

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