Cutting machine

Abstract

A cutting machine is provided. An irradiation unit that irradiates light toward a tool from a radial outer side of the tool has a first light source, a second light source, a first lens body, and a second lens body that are arranged across a virtual plane including the tool. A first exit surface of the first lens body has a first outermost peripheral portion having a first distance farthest from a first central axis that passes through a first light source center of the first light source and is perpendicular to the first light source. A second exit surface of the second lens body has a second outermost peripheral portion having a second distance farthest from a second central axis that passes through a second light source center of the second light source and is perpendicular to the second light source. The first light source and the second light source are arranged such that a distance between the first central axis and the second central axis is less than a sum of the first distance and the second distance. Accordingly, an irradiation unit that has been required in the past to clearly reflect a shadow of the tool on a surface of a workpiece can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to a cutting machine for cutting a workpiece such as wood. BACKGROUND

[0002] For example, such a cutting machine has a cutting machine main body having a cutter, and a base that supports the cutting machine main body so as to be swingable in the up-down direction. The cutter is rotated by a motor as a power source. The rotating cutter is made to cut into a workpiece placed below the cutting machine main body. Thereby, the workpiece can be subjected to cutting work.

[0003] In the past, there has been a cutting machine having, for example, a laser for confirming the position at which the cutter cuts into the workpiece. The laser irradiates laser light toward a workpiece placed below. The irradiation position of the laser light is aligned with an ink line drawn on the workpiece. Thereby, the cutter can be made to move downward to cut into the position of the ink line.

[0004] In the past, there has also been a cutting machine having an LED for ink line alignment instead of a laser. The cutting machines described in Patent Document 1 and Patent Document 2 have one LED in the irradiation portion provided on the extension line of the disc surface. The LED irradiates light toward the cutter below. Therefore, the surface of the workpiece placed below the cutter reflects the shadow of the cutter. The shadow of the cutter is aligned with the position of the ink line drawn on the workpiece. Thereby, the cutter can be made to move downward to cut into the position of the ink line.

[0005] [Related Art]

[0006] [Patent Document]

[0007] Patent Document 1: U.S. Patent No. 6742430

[0008] Patent Document 2: European Patent Application Publication No. 2014399 SUMMARY

[0009] [Problems to be Solved by the Invention]

[0010] In the irradiation of one LED in the past, for example, in the case where the cutting machine main body is located at the upper dead point away from the workpiece, it is difficult to clearly reflect the shadow of the cutter on the surface of the workpiece. Therefore, it is sometimes difficult to align the shadow of the cutter with the ink line drawn on the workpiece. Therefore, in the past, there has been a demand for an irradiation portion that can clearly reflect the shadow of the cutter on the surface of the workpiece.

[0011] [Means for Solving the Problems]

[0012] According to one feature of the present application, a cutting machine has a cutting machine main body and an irradiation section, wherein the cutting machine main body has a disc-shaped cutter; the irradiation section irradiates light toward the cutter from a radially outer side of the cutter. The irradiation section has a first light source, a second light source, a first lens body, and a second lens body, wherein the first light source and the second light source are disposed across a virtual plane containing the cutter. The first lens body has a first incident surface into which light from the first light source is incident and a first exit surface from which light is emitted. The second lens body has a second incident surface into which light from the second light source is incident and a second exit surface from which light is emitted. The first exit surface has a first outermost peripheral portion having a first distance farthest from a first central axis, wherein the first central axis passes through a first light source center of the first light source and is perpendicular to the first light source. The second exit surface has a second outermost peripheral portion having a second distance farthest from a second central axis, wherein the second central axis passes through a second light source center of the second light source and is perpendicular to the second light source. The first light source and the second light source are disposed in such a manner that a distance between the first central axis and the second central axis is less than a sum of the first distance and the second distance.

[0013] Thus, light irradiated by the first light source is emitted from the first exit surface through the first lens body. Light irradiated by the second light source is emitted from the second exit surface through the second lens body. By making the distance between the first central axis and the second central axis less than the sum of the first distance and the second distance, the first exit surface and the second exit surface are disposed close to each other. Thus, the distance of the first exit surface from one side surface (e.g., the right side surface) of the cutter becomes small. The distance of the second exit surface from the other side surface (e.g., the left side surface) of the cutter becomes small. The cut piece is placed on a side of the cutter opposite to the irradiation section. Thus, it is possible to suppress light emitted from the first exit surface and the second exit surface from going around between the cutter and the cut piece. Accordingly, it is possible to clearly reflect a shadow of the cutter on a surface of the cut piece. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective view of a cutting machine according to the first embodiment.

[0015] Figure 2 is a right side view of the cutting machine.

[0016] Figure 3 is a front view of the cutting machine.

[0017] Figure 4 is a left side view of a partial longitudinal section of the cutting machine when the cutting machine main body is at a top dead center.

[0018] Figure 5 is a longitudinal section view of the irradiation section when the cutting machine main body is lowered from the top dead center by a prescribed angle K.

[0019] Figure 6is a left view of a partial longitudinal section including the cutting machine when the cutting machine main body is lowered from the upper dead point by a prescribed angle K.

[0020] Figure 7 is a perspective view of the state after assembling each component of the irradiation section.

[0021] Figure 8 is a perspective view of the condenser lens and the LED substrate.

[0022] Figure 9 is a plan view of the condenser lens and the LED substrate as viewed from the exit surface side.

[0023] Figure 10 is a bottom view showing the positional relationship of the knife, the LED, and the condenser lens.

[0024] Figure 11 is a side view of the condenser lens.

[0025] Figure 12 is a perspective view of the condenser lens.

[0026] Figure 13 is a plan view of the condenser lens as viewed from the entrance surface side.

[0027] Figure 14 is a plan view of the condenser lens as viewed from the exit surface side.

[0028] Figure 15 is a sectional view along XV-XV in Figure 9 .

[0029] Figure 16 is a sectional view along XVI-XVI in Figure 9 .

[0030] Figure 17 is a sectional view along XVII-XVII in Figure 15 .

[0031] Figure 18 is a view of the condenser lens according to the second embodiment.

[0032] Figure 19 is a perspective view of the condenser lens.

[0033] Figure 20 is a plan view of the condenser lens as viewed from the entrance surface side.

[0034] Figure 21 is a plan view of the condenser lens as viewed from the exit surface side.

[0035] Figure 22 is a sectional view along XVIII-XVIII in Figure 20FIG. 16 is a cross-sectional view of the XXII-XXII in FIG. 15. This figure shows the state after assembling the condenser lens and the LED.

[0036] [Explanation of Reference Numerals]

[0037] 1: cutting machine (first embodiment); 2: base; 2a: rotation support shaft; 3: auxiliary work table; 4: rotary table; 4a: rotary table upper surface; 4b: arm support portion; 5: work table extension; 5a: knife edge plate; 5b: slot hole; 6: positioning stopper; 6a: positioning surface; 7: bevel cutting scale; 7a: fixing screw; 7b: positioning recess; 10: cutting machine main body, 10a: up-down swinging support shaft; 11: cutter; 11a: right side surface; 11b: left side surface; 12: fixed cover; 12a: arrow; 12b: threaded hole; 13: movable cover; 13a: through hole; 14: fixing screw; 15: outer flange; 16: inner flange; 17: dust collection guide; 17a: dust collection hose; 18: rear dust collection port; 18a: dust collection hose; 20: motor housing; 20a: air inlet; 20b: air outlet; 21: electric motor; 22: gear box; 23: output shaft; 25: battery mounting portion; 26: battery pack; 7: controller housing; 28: controller; 30: handle portion; 31: operation handle; 32: switch lever; 33: unlocking button; 34: irradiation portion switch; 40: main body support arm; 40a: left-right tilting support shaft; 41: slide bar; 42: sliding base; 45: rotary table fixing mechanism; 46: grip portion; 47: fixing rod; 50: forward locking mechanism; 51: unlocking operation handle; 52: positioning pin; 60: irradiation portion; 61: lens connecting body; 62: lens body; 62a: first lens body; 62b: second lens body; 63: base plate abutting surface; 64: incident surface; 64a: incident surface recess (first incident surface recess, second incident surface recess); 64b: side surface; 64c: spherical protrusion; 64d: first incident surface; 64e: second incident surface; 65: exit surface; 65a: circular arc-shaped recess; 65b: exit surface protrusion; 65c: central recess; 65d: first exit surface; 65e: second exit surface; 65f: first outer periphery; 65g: second outer periphery; 65h: first outermost periphery portion; 65i: second outermost periphery portion; 66: outer peripheral side surface; 66a: outer side reflecting surface; 66b: cross-sectional circular arc line; 67: leg portion; 67a: outer extension portion; 67b: columnar portion; 67c: diameter expansion portion; 70: irradiation portion cover; 70a: fastening bolt; 70b: through hole; 70c: threaded hole; 71: base plate; 71a: LED control portion; 71b, 71c: through hole; 71d: fastening bolt; 72: LED (light source); 72a: first light source; 72b: second light source; 72c: first light source center; 72d: second light source center; 73: first center axis; 74: second center axis; 80: cutting machine (second embodiment); 81: irradiation portion; 82: lens connecting body; 83: lens body; 83a: first lens body; 83b: second lens body; 84: base plate abutting surface; 85: incident surface; 85a: incident surface recess (spherical protrusion, first incident surface recess, second incident surface recess); 85b: side surface; 85c: first incident surface;85d: Second incident surface; 86: Exit surface; 86a: First exit surface; 86b: Second exit surface; 86c: Protrusion of exit surface; 86d: First outer periphery; 86e: Second outer periphery; 86f: First outermost periphery; 86g: Second outermost periphery; 87: Outer lateral surface; 87a: Outer reflecting surface; 87b: Sectional arc; 88: Leg; 88a: Outer extension; 88b: Columnar part; 89: First central axis; 90: Second central axis; W: Cutting part; S: Virtual plane; L: Irradiation line; A1, A2: Central angle; r1: First distance; r2: Second distance; r3: Distance (between the first and second central axes); K: Specified angle. Detailed Implementation

[0038] based on Figures 1-17 The first embodiment of the present invention will be described. In this embodiment, a cutting machine 1, referred to as a sliding circular saw, will be used as an example. Figure 1 As shown, the cutting machine 1 includes: a base 2, which is placed on a table or floor, etc.; a turntable 4, which is used to hold the workpiece to be cut; and a cutting machine body 10. The turntable 4 is located above and supported on the base 2. The cutting machine body 10 is disposed above the turntable 4. On the cutting machine body 10, a generally disc-shaped blade 11, called a tipped saw blade, is rotatably supported. The user performs the cutting operation near the cutting machine 1. In the following description, the up, down, left, and right directions of the components and structures are defined based on the user. The front and back directions of the components and structures are defined with the near side as the front side when viewed by the user. In addition, the direction in which the LED 72 points, i.e., the illumination direction of the illumination line L, is designated as P, and the opposite direction is designated as Q. In the thickness direction of the LED substrate, the upstream side of the rotation direction of the blade is designated as T, and the downstream side is designated as U (PQ and TU are orthogonal).

[0039] like Figure 1 As shown, the turntable 4 is roughly circular when viewed from above. The upper surface 4a of the turntable 4 is horizontally positioned. The turntable 4 is capable of rotating horizontally relative to the base 2 about a pivot 2a located at the center of the roughly circular shape. Auxiliary worktables 3 are mounted on the left and right sides of the base 2, respectively, and these auxiliary worktables 3 have the same upper surface height as the upper surface 4a of the turntable. The turntable 4 has a turntable extension 5 extending along the side of the tool 11. A horizontally extending cutting edge plate 5a is provided on the upper surface of the turntable 4a and the upper surface of the turntable extension 5. A notch-shaped slot 5b extending along the side of the tool 11 is provided in the center of the cutting edge plate 5a.

[0040] like Figure 1 , Figure 4As shown in the figure, a wall-shaped positioning baffle 6 extending in the left-right direction and upward is provided above the turntable 4. The positioning baffle 6 has a positioning surface 6a vertically standing on the front surface. The positioning surface 6a is located on a vertical plane passing through the rotation support shaft 2a as the center of rotation of the turntable 4. The cut piece W placed on the upper surface 4a of the turntable is abutted against the positioning surface 6a, thereby being positioned in the front-rear direction.

[0041] As shown in the figure, Figure 1 , Figure 4 A circular arc-shaped miter scale plate 7 is provided in a region of about half a circumference of the front portion of the base 2. The miter scale plate 7 is provided to horizontally extend at a position lower than the upper surface 4a of the turntable. The miter scale plate 7 has a plurality of groove-shaped positioning recesses 7b extending in the radial direction. The positioning recesses 7b are provided at a prescribed angular interval in the circumferential direction of the miter scale plate 7. The tip end portion of the positioning pin 52 described later can enter the positioning recesses 7b. The miter scale plate 7 is fixed to the base 2 by a fixing screw 7a. The fixing screw 7a is inserted into an elongated hole of the base 2. By loosening the fixing screw 7a, the miter scale plate 7 can be moved in the left-right direction, and the angle of the positioning baffle 6 and the cutter 11 can be finely adjusted. For example, in a state where the positioning pin 52 is inserted into a positioning recess 7b at a right angle position, the angle of the cutter 11 and the positioning baffle 6 can be precisely adjusted to a right angle. This adjustment is mainly performed during the production of products.

[0042] As shown in the figure, Figure 4 A main body support arm 40 extending substantially upward is provided at the rear of the turntable 4. The main body support arm 40 is supported so as to be inclined in the left-right direction with respect to the arm support portion 4b of the turntable 4 about a left-right inclination support shaft 40a extending in the front-rear direction. An elongated slide bar 41 parallel to the side surface of the cutter 11 and extending in the horizontal line is provided at the upper portion of the main body support arm 40. Two slide bars 41 are provided side by side in the up-down direction. The slide bar 41 supports a slide base 42 capable of sliding in the front-rear direction. By sliding the slide base 42 in the front-rear direction, the cutter 11 can cut a cut piece W having a wide width in the front-rear direction placed on the turntable 4. The cutter main body 10 can be swung in the up-down direction with respect to the slide base 42 about an up-down swing support shaft 10a extending in the left-right direction.

[0043] As shown in the figure, Figure 3 The cutter 11 is integrally mounted to an output shaft 23 extending in the left-right direction and rotatably supported to the cutter main body 10. The cutter 11 is mounted to the output shaft 23 in a state where the rotation center thereof is sandwiched by the outer flange 15 and the inner flange 16 by screwing the fixing screw 14.

[0044] As shown in the figure, Figure 1As shown, the cutter main body 10 has a fixed cover 12 and a movable cover 13 that cover the periphery of the cutter 11. The fixed cover 12 covers the upper half of the periphery of the cutter 11. On the left side of the fixed cover 12, a hollow arrow 12a indicating the direction of rotation of the cutter 11 is shown. The movable cover 13 can cover the lower half of the periphery of the cutter 11. The movable cover 13 rotates in conjunction with the up-and-down swinging of the cutter main body 10 to open and close the lower half of the periphery of the cutter 11. In the case where the cutter main body 10 is swung upward, the movable cover 13 rotates in the closing direction (clockwise in Figure 1 ). Accordingly, the lower half of the periphery of the cutter 11 is covered. In the case where the cutter main body 10 is swung downward, the movable cover 13 rotates in the opening direction (counterclockwise in Figure 1 ). Accordingly, the lower half of the periphery of the cutter 11 is exposed.

[0045] As shown in Figure 3 , the movable cover 13 is integrally molded from a resin member having a high light transmittance. The resin material is, for example, transparent polycarbonate. The movable cover 13 has a through-hole 13a extending in the circumferential direction and penetrating the inside and outside of the movable cover 13 on the circumferential side surface.

[0046] As shown in Figure 2 , Figure 4 , a dust collection guide 17 having a front opening and a substantially C-shaped cross section is provided on the lower side of the rear portion of the fixed cover 12. The dust collection guide 17 suppresses the scattering of chips generated by cutting the workpiece W toward the rear or both sides of the cutter 11. The upper portion of the dust collection guide 17 communicates with a dust collection hose 17a extending to the right from the rear portion of the cutter main body 10. A front opening is provided on the front portion of the main body support arm 40. A rear dust collection port 18 having a cylindrical shape is provided on the front portion of the main body support arm 40. The rear dust collection port 18 suppresses the scattering of chips at a position further to the rear than the dust collection guide 17. The dust collection guide 17 and the rear dust collection port 18 respectively communicate with the dust collection hoses 17a, 18a. The dust collection hoses 17a, 18a are connected to a dust collector provided separately from the cutting machine 1. Accordingly, chips scattered around the dust collection guide 17 and the rear dust collection port 18 can be transported into the dust collector through the dust collection hoses 17a, 18a.

[0047] As shown in Figure 2 , Figure 3 , the cutter main body 10 has a motor housing 20 on the right of the fixed cover 12. The motor housing 20 has a substantially cylindrical shape, and extends upward and to the right as it goes toward the rear when the cutter main body 10 is at the upper dead center. An air intake port 20a capable of sucking in external air is provided on the top end surface of the rear right side of the motor housing 20. An electric motor 21 is housed in the cutter main body 10. As an example of the electric motor 21, a motor called a DC brushless motor is used.

[0048] AsFigure 3 As shown, a gearbox 22 is disposed between the motor housing 20 and the fixed cover 12 in the left-right direction. The interior of the motor housing 20 communicates with the interior of the gearbox 22. The power of the electric motor 21 is transmitted to the output shaft 23 while being reduced in speed by the reduction gear set housed in the gearbox 22. Therefore, driven by the electric motor 21, the tool 11 mounted on the output shaft 23 rotates around the axis of the output shaft 23. Figure 2 As shown, an exhaust port 20b is provided at the rear of the gearbox 22. A fan mounted on the motor shaft rotates by driving the electric motor 21. Therefore, cooling air flows from the air inlet 20a to the exhaust port 20b within the motor housing 20. This cooling air cools the electric motor 21.

[0049] like Figure 2 As shown, a rectangular box-shaped controller housing 27 is arranged adjacent to the main body 10 of the cutting machine. The controller housing 27 houses the controller 28. The controller 28 has a shallow, generally rectangular box and a control substrate molded in resin and housed within the box. The controller 28 mainly houses a control circuit, a drive circuit, an automatic stop circuit, etc., for controlling the operation of the electric motor 21. The control circuit has a microcomputer that sends control signals to the electric motor 21 based on the position information of the rotor of the electric motor 21. The drive circuit has a FET that switches the current of the electric motor 21 based on the control signals received from the control circuit. The automatic stop circuit cuts off the power supply to the electric motor 21 based on the detection result of the state of the battery pack 26 (described later) to avoid over-discharge or overcurrent.

[0050] like Figure 2 As shown, the cutting machine body 10 has a battery mounting section 25 at the rear of the motor housing 20. The mounting surface of the battery mounting section 25 extends in a direction substantially orthogonal to the length direction of the motor housing 20. The battery mounting section 25 can be installed and removed by sliding a generally rectangular box-shaped battery pack 26. The battery pack 26 is, for example, a lithium-ion battery with an output voltage of 36V. The battery pack 26 can be repeatedly charged using a separately provided charger after being removed from the battery mounting section 25. The battery pack 26 can be flexibly used as a power source for other rechargeable power tools such as screwdrivers or electric drills.

[0051] like Figure 3As shown, a handle portion 30 is provided at the upper front of the cutting machine body 10. The handle portion 30 is positioned to the right of the fixed cover 12. The handle portion 30 has an annular operating handle 31 extending in the left-right direction. A switch lever 32 is provided on the inner circumference of the operating handle 31. The switch lever 32 can be activated by the user's finger while holding the operating handle 31. When the switch lever 32 is activated, the electric motor 21 starts. An unlock button 33 is provided at the upper part of the operating handle 31. By pressing the unlock button 33, the switch lever 32 can be activated. This prevents accidental activation of the electric motor 21.

[0052] like Figure 3 As shown, an illumination switch 34 is provided on the inner circumference side of the operating handle 31, on the surface facing the switch lever 32. By pressing the illumination switch 34, the LED 72 (see reference) of the illumination section 60 located at the upper front of the fixed cover 12 can be activated. Figure 4 (Lights up or turns off. The illumination section 60 will be explained in detail later.)

[0053] like Figure 1 , Figure 4 As shown, a turntable fixing mechanism 45 is provided at the lower part of the turntable extension 5. A handle 46 is provided at the front of the turntable extension 5. The handle 46 has a concave-convex shape on its periphery so that the user can easily grip and rotate it. The user can hold the handle 46 and rotate the turntable 4 horizontally relative to the base 2. A fixing rod 47 extends from the handle 46 toward the rear interior of the turntable extension 5. The fixing rod 47 is supported inside the turntable extension 5 by a threaded engagement. When the handle 46 is rotated about the axis of the fixing rod 47, the fixing rod 47 is displaced in the front-rear direction. By displacing the fixing rod 47 rearward, the turntable 4 is locked at a predetermined bevel angle relative to the base 2. By displacing the fixing rod 47 forward, the lock on the turntable 4 relative to the base 2 is released.

[0054] like Figure 1 , Figure 4As shown, a positive locking mechanism 50 is provided at the lower part of the turntable extension 5. The positive locking mechanism 50 has an unlocking operation handle 51 and a positioning pin 52. The unlocking operation handle 51 is located at the front of the turntable extension 5, above and behind the handle portion 46. The positioning pin 52 is connected to the unlocking operation handle 51 and extends toward the rearward interior of the turntable extension 5. The positioning pin 52 is located at approximately the same height as the beveled dial 7. The positioning pin 52 is normally subjected to a rearward force. The rear end of the positioning pin 52 subjected to the rearward force can enter the positioning recess 7b. When the turntable 4 is rotated horizontally by holding the handle portion 46, the positioning pin 52 enters any one of the multiple positioning recesses 7b. Therefore, the turntable 4 is positioned at a position corresponding to a predetermined bevel angle of the positioning recess 7b. When the unlocking operation handle 51 is pressed, the positioning pin 52 moves forward against the applied force. Therefore, the engagement between the rear end of the positioning pin 52 and the positioning recess 7b is released.

[0055] like Figure 4 , Figure 5 As shown, the irradiation section 60 is provided on the inner circumferential side of the upper front part of the fixed cover 12. The irradiation section 60 has two LEDs 72 as light sources, a substrate 71 that mounts the two LEDs 72, and an irradiation cover 70 that supports the substrate 71 and is mounted on the fixed cover 12. The irradiation section 60 has a lens connector 61 that changes the irradiation direction of the LEDs 72. The irradiation section 60 is located radially outward of the cutter 11 and irradiates light onto the cutter 11. The irradiation cover 70 extends relatively long in the circumferential direction of the fixed cover 12 along the circumferential side surface of the fixed cover 12. The irradiation cover 70 has a through hole 70b that penetrates radially through the fixed cover 12. A fastening bolt 70a passes through the through hole 70b and is fastened in the threaded hole 12b provided in the fixed cover 12. Accordingly, the irradiation cover 70 is mounted on the fixed cover 12.

[0056] like Figure 5 , Figure 7 , Figure 9 As shown, the substrate 71 is made of aluminum and is formed into a rectangular plate shape. Two LEDs 72 and an LED control unit 71a are mounted on the substrate 71. The LED control unit 71a is based on a controller 28 (see reference 28). Figure 2 The system receives a command signal to turn the two LEDs 72 on or off. A through hole 71b, extending through the substrate 71 in the thickness direction, is formed in the center of the substrate 71. A threaded hole 70c, extending radially along the fixing cover 12, is provided on the inner circumference side of the irradiation cover 70. A fastening bolt 71d passes through the through hole 71b and is fastened in the threaded hole 70c. Accordingly, the substrate 71 is mounted on the irradiation cover 70.

[0057] like Figure 8As shown, two lens bodies 62 are connected to form a lens connector 61. The lens connector 61 has three legs 67. Each leg 67 has a cylindrical columnar portion 67b. Three through holes 71c extending through the substrate 71 in the thickness direction are formed on the front part of the substrate 71. The columnar portion 67b is inserted into the through hole 71c, and the top end of the columnar portion 67b is riveted (flattened) on the inner (upper) side of the substrate 71, thus expanding it radially to form an enlarged diameter portion 67c. Through the enlarged diameter portion 67c, the lens connector 61 cannot be removed from the substrate 71 (see reference). Figure 16 Accordingly, the lens connector 61 is mounted on the substrate 71.

[0058] like Figure 10 As shown, the illumination unit 60 has two LEDs 72 and two lens bodies 62. The two LEDs 72 include a first light source 72a and a second light source 72b; the two lens bodies 62 include a first lens body 62a and a second lens body 62b. The center 72c of the first light source 72a is located to the right of the virtual plane formed by the right side 11a of the extension cutter 11. The center 72d of the second light source 72b is located to the left of the virtual plane formed by the left side 11b of the extension cutter 11. The first light source 72a and the second light source 72b are configured with the same front-to-back position. The first lens body 62a is centered on a first central axis 73 that passes through the center 72c of the first light source and is perpendicular to the surface of the first light source 72a. The second lens body 62b is centered on a second central axis 74 that passes through the center 72d of the second light source and is perpendicular to the surface of the second light source 72b. The first central axis 73 and the second central axis 74 extend in the same direction.

[0059] like Figures 11-14 As shown, the second lens body 62b is formed symmetrically to the first lens body 62a. In the following description, for the repeated structures of the first lens body 62a and the second lens body 62b, only one side will be described in detail. The first lens body 62a is a generally conical shape whose diameter increases from the incident surface 64 side toward the exit surface 65 side. The first incident surface 64d and the first exit surface 65d of the first lens body 62a have an outer periphery with an arcuate shape centered on the first central axis 73. The second incident surface 64e and the second exit surface 65e of the second lens body 62b have an outer periphery with an arcuate shape centered on the second central axis 74.

[0060] like Figure 13 , Figure 15As shown, the first lens body 62a has a planar substrate abutment surface 63 on its end face on the incident surface 64 side. The substrate abutment surface 63 abuts against the surface of the substrate 71. The incident surface 64 includes a first incident surface 64d on the side of the first lens body 62a and a second incident surface 64e on the side of the second lens body 62b. The first incident surface 64d has an incident surface recess 64a, which is axially recessed from the substrate abutment surface 63 toward the first central axis 73. The incident surface recess 64a is recessed into a generally cylindrical shape centered on the first central axis 73. The first light source 72a is housed in the incident surface recess 64a with the center 72c of the first light source positioned on the first central axis 73. The incident surface recess 64a is sealed by abutting the substrate 71 against the substrate abutment surface 63 while the first light source 72a is housed.

[0061] like Figure 15 As shown, with the center 72d of the second light source positioned on the second central axis 74, the second light source 72b is housed in the incident surface recess 64a on the side of the second lens body 62b. The incident surface recess 64a is sealed by bringing the substrate 71 into contact with the substrate abutment surface 63, thereby sealing the second light source 72b in the housed state. The incident surface recess (first incident surface recess) 64a on the side of the first lens body 62a and the incident surface recess (second incident surface recess) 64a on the side of the second lens body 62b are separated by the substrate abutment surface 63 between them.

[0062] like Figure 15 As shown, at least a portion of the side surface 64b of the incident surface recess 64a includes a spherical shape centered on the center 72c of the first light source. In other words, at least a portion of the side surface 64b includes a cross-sectional arc shape centered on the center 72c of the first light source on a cross-section passing through the first central axis 73. The cross-sectional arc shape of the side surface 64b is mainly located below the surface of the first light source 72a. A spherical protrusion 64c, centered on the first central axis 73 and extending towards the first light source 72a, is provided on the bottom surface of the incident surface recess 64a. The incident surface recess 64a, the side surface 64b, and the spherical protrusion 64c are all incident surfaces 64 that allow light emitted by the LED 72 to enter the lens body 62.

[0063] like Figure 14As shown, the exit surface 65 includes a first exit surface 65d on the side of the first lens body 62a and a second exit surface 65e on the side of the second lens body 62b. The first exit surface 65d has a first outer periphery 65f in an arc shape centered on the first central axis 73. The first outermost peripheral portion 65h on the first outer periphery 65f is located at the position farthest from the first central axis 73 and has a first distance r1 between it and the first central axis 73. Since the first outer periphery 65f is arc-shaped, any point on the first outer periphery 65f corresponds to the first outermost peripheral portion 65h. The second exit surface 65e has a second outer periphery 65g in an arc shape centered on the second central axis 74. The second outermost peripheral portion 65i on the second outer periphery 65g is located at the position farthest from the second central axis 74 and has a second distance r2 between it and the second central axis 74. Any point on the arc-shaped second outer periphery 65g corresponds to the second outermost peripheral portion 65i.

[0064] like Figure 14 As shown, the distance r3 between the first central axis 73 and the second central axis 74 is smaller than the sum of the first distance r1 and the second distance r2. Therefore, when viewed from the direction of the first central axis 73, the first exit surface 65d and the second exit surface 65e are shapes in which the central portions of two arcuate shapes partially overlap. The first outer perimeter 65f and the second outer perimeter 65g intersect each other at their respective ends. The first outer perimeter 65f is an arcuate shape with a central angle A1 centered on the first central axis 73. The second outer perimeter 65g is an arcuate shape with a central angle A1 centered on the second central axis 74. The central angle A1 is greater than 180° and less than 360°.

[0065] like Figure 14 , Figure 15 As shown, the first lens body 62a has an exit surface protrusion 65b that protrudes axially toward the first central axis 73 at a position radially inward from the first outer periphery 65f. The exit surface protrusion 65b is generally cylindrical in shape with the first central axis 73 as its center. The outer peripheral surface of the exit surface protrusion 65b is generally spherical with a predetermined point on the first central axis 73 as its center. The inner peripheral surface of the exit surface protrusion 65b extends axially along the first central axis 73. The first lens body 62a has a central recess 65c that is recessed axially toward the first central axis 73 at a position radially inward from the exit surface protrusion 65b. When viewed from the axial direction of the first central axis 73, the central recess 65c is cylindrical in shape with the first central axis 73 as its center. In other words, the central recess 65c is centered on the axial center of the exit surface protrusion 65b. The bottom surface of the central recess 65c is perpendicular to the first central axis 73.

[0066] like Figure 14 , Figure 15As shown, the first lens body 62a has an arc-shaped recess 65a axially recessed towards the first central axis 73 between the first outer periphery 65f and the exit surface protrusion 65b. When viewed from the axial direction of the first central axis 73, the arc-shaped recess 65a is an arc shape centered on the first central axis 73. The arc-shaped recess 65a surrounds the outer periphery of the exit surface protrusion 65b. The exit surface protrusion 65b, the central recess 65c, and the arc-shaped recess 65a are all exit surfaces 65 through which light emitted by the LED 72 is emitted.

[0067] like Figure 12 , Figure 15 As shown, the first lens body 62a has a generally conical outer peripheral side surface 66 connecting the outer peripheral end of the substrate abutment surface 63 and the first outer peripheral edge 65f. The outer peripheral side surface 66 is an outer reflecting surface 66a that reflects light inward within the first lens body 62a. As light travels from the first incident surface 64d toward the first exit surface 65d, the diameter of the outer reflecting surface 66a, centered on the first central axis, increases. Furthermore, the outer reflecting surface 66a is formed in an arc shape convex outward in a cross-section passing through the first central axis 73.

[0068] like Figure 17 As shown, the outer reflecting surface 66a is a cross-sectional arc line 66b with an arc-shaped outer periphery on a cross-section orthogonal to the first central axis 73. The cross-sectional arc line 66b extends from the first incident surface 64d to the first exit surface 65d (see reference). Figure 15 In any cross-section up to the first central axis 73, the central angle A2 is an arc shape. The central angle A2 is greater than 180° and less than 360°.

[0069] like Figure 15As shown, the light irradiated from the second light source center 72d of the second light source 72b is incident into the lens body 62 from the bottom surface of the incident surface recess 64a or the side surface 64b or the spherical protrusion 64c. The light incident from the spherical protrusion 64c is refracted toward the axial direction of the second central axis 74. Then, it is emitted along the axial direction of the second central axis 74 from the bottom surface of the central recess 65c. The light incident from the bottom surface of the incident surface recess 64a is refracted at two stages of the bottom surface of the incident surface recess 64a and the outer peripheral surface of the exit surface protrusion 65b. Thereby, it is emitted from the outer peripheral surface of the exit surface protrusion 65b toward the axial direction of the second central axis 74. The light incident from the side surface 64b advances in the normal direction of the side surface 64b and is reflected toward the axial direction of the second central axis 74 by the outer side reflecting surface 66a. Then, it is emitted along the axial direction of the second central axis 74 from the circular arc-shaped recess 65a or the region between the circular arc-shaped recess 65a and the second outer peripheral edge 65g. In this way, the light emitted from the second exit surface 65e is emitted in a state coinciding with the axial direction of the second central axis 74. The light irradiated from the first light source 72a and emitted from the first exit surface 65d is also similarly emitted in a state coinciding with the axial direction of the first central axis 73.

[0070] As shown in Figure 12 , Figure 14 , the leg portion 67 has an outer extension portion 67a extending from the first outer peripheral edge 65f or the second outer peripheral edge 65g to the side of the lens body 62. A columnar portion 67b extends from the top end of the outer extension portion 67a from the exit surface 65 side to the incident surface 64 side. Therefore, the leg portion 67 is arranged at a position deviated from the path of the light passing through the lens body 62.

[0071] As shown in Figure 4 , the light emitted from the exit surface 65 (refer to Figure 15 ) of the lens connecting body 61 is irradiated from the upper direction of the cutter 11 to the lower side of the work W placed. The irradiation line L of the light is slightly inclined to the rear side as it goes toward the lower side when the cutting machine main body 10 is at the upper dead point. The irradiation line L passes a position slightly forward of the point directly below the center of rotation of the cutter 11, i.e., the output shaft 23, on a virtual plane S that is horizontal through the lower end of the cutter 11. As shown in Figure 6 , the cutting machine main body 10 is swung downward from the upper dead point to a prescribed position between the upper dead point and the lower dead point by a prescribed angle K, and the lower end of the cutter 11 is brought close to the work W. At this time, the irradiation line L passes a position slightly forward of the point directly below the center of rotation of the cutter 11, i.e., the output shaft 23, on the virtual plane S that is horizontal through the lower end of the cutter 11. The virtual plane S is parallel to the upper surface of the work W and is in the same plane as the upper surface of the work W when the lower end of the cutter 11 is in contact with the upper surface of the work W.

[0072] As described above, the cutting machine 1 has: the cutting machine main body 10 which isFigure 4 has a disc-shaped cutter 11; and an irradiation section 60 that irradiates light toward the cutter 11 from a radially outer side of the cutter 11. As shown in Figure 10 Irradiation section 60 has a first light source 72a and a second light source 72b disposed across a virtual plane that includes cutter 11, and a first lens body 62a and a second lens body 62b, as shown in Figure 14 First lens body 62a has a first incident surface 64d that receives light from first light source 72a and a first exit surface 65d that emits light, as shown in Figure 11 First exit surface 65d has a first outermost peripheral portion 65h that has a first distance r1 from a first central axis 73 that passes through a first light source center 72c of first light source 72a and is perpendicular to first light source 72a, as shown in Second exit surface 65e has a second outermost peripheral portion 65i that has a second distance r2 from a second central axis 74 that passes through a second light source center 72d of second light source 72b and is perpendicular to second light source 72b. First light source 72a and second light source 72b are disposed such that a distance r3 between first central axis 73 and second central axis 74 is less than a sum of first distance r1 and second distance r2.

[0073] Therefore, light irradiated by first light source 72a is emitted from first exit surface 65d by first lens body 62a. Light irradiated by second light source 72b is emitted from second exit surface 65e by second lens body 62b. By making distance r3 between first central axis 73 and second central axis 74 less than the sum of first distance r1 and second distance r2, first exit surface 65d and second exit surface 65e are disposed close to each other. Therefore, the distance between first exit surface 65d and right side surface 11a of cutter 11 becomes small. The distance between second exit surface 65e and left side surface 11b of cutter 11 becomes small. A workpiece W is placed on a side of cutter 11 opposite irradiation section 60. Therefore, light emitted from first exit surface 65d and second exit surface 65e can be inhibited from going around between cutter 11 and workpiece W. Accordingly, the shadow of cutter 11 can be clearly reflected on the surface of workpiece W.

[0074] According to other features of the present application, as shown in Figure 14 First lens body 62a and second lens body 62b are a lens connection body 61 as one component. Therefore, only one lens connection body 61 needs to be assembled on irradiation section 60. Therefore, the distance between first light source 72a and second light source 72b can be made close while the assemblability of irradiation section 60 is well maintained.

[0075] Other features of the invention, such as Figure 15 As shown, the first exit surface 65d has a first outer periphery 65f in an arc shape, the first outer periphery 65f having a length greater than 180° centered on the first central axis 73. The second exit surface 65e has a second outer periphery 65g in an arc shape, the second outer periphery 65g having a length greater than 180° centered on the second central axis 74. The first outer periphery 65f and the second outer periphery 65g intersect.

[0076] Therefore, the brightness deviation of the light emitted from the first exit surface 65d in the circumferential direction of the first exit surface 65d is reduced. The brightness deviation of the light emitted from the second exit surface 65e in the circumferential direction of the first exit surface 65d is also reduced. Therefore, the brightness deviation is reduced within the illumination range of the surface of the workpiece W being cut. As a result, the shadow of the tool 11 can be clearly reflected on the workpiece W being cut. Furthermore, the distances between the first central axis 73 and the second central axis 74 can be brought closer. In this way, while ensuring the shape of the lens body 62 required to clearly reflect the shadow of the tool 11 on the workpiece W being cut, the distances between the first light source 72a and the second light source 72b can be brought closer.

[0077] Other features of the invention, such as Figure 15 As shown, the first lens body 62a has an outer reflecting surface 66a, which reflects light entering from the first incident surface 64d and passing through the first lens body 62a toward the first exiting surface 65d. The outer reflecting surface 66a moves away from the first central axis 73 as it moves from the first incident surface 64d toward the first exiting surface 65d, and has an outwardly convex curved shape in a cross-section passing through the first central axis 73. Therefore, the outer reflecting surface 66a can direct light entering the first lens body 62a from the first incident surface 64d toward the outside of the first lens body 62a toward the first exiting surface 65d. Thus, light loss can be suppressed. Furthermore, the direction of light emitted from the first exiting surface 65d is consistent. Therefore, deviations in the brightness of the irradiated light can be reduced.

[0078] Other features of the invention, such as Figure 17 As shown, the outer reflecting surface 66a is a cross-sectional arc 66b with an arc shape. This cross-sectional arc 66b has a length greater than 180° centered on the first central axis 73 at any position from the first incident surface 64d to the first exit surface 65d (see reference). Figure 13 Therefore, it is possible to ensure the shape of the lens body 62 required to reduce the brightness deviation of the irradiated light while keeping the distance between the first light source 72a and the second light source 72b close.

[0079] Other features of the invention, such as Figure 15 , Figure 15As shown, the first lens body 62a has an incident surface recess 64a formed in the first incident surface 64d, and a spherical protrusion 64c protruding from the bottom surface of the incident surface recess 64a toward the first light source 72a. Thus, by providing the incident surface recess 64a, the thickness of the first lens body 62a in the axial direction of the first central axis 73 can be suppressed from becoming thick. Also, by providing the spherical protrusion 64c, the direction of light can be refracted toward the axial direction of the first central axis 73 without the thickness of the first lens body 62a exceeding the required thickness.

[0080] According to other features of the present application, as Figure 15 As shown, at least a portion of the side surface 64b of the incident surface recess 64a is in a circular arc shape centered on the center of the first light source 72a in a cross section passing through the first central axis 73. Thus, light passing through the cross section circular arc shape portion of the side surface 64b is generally directed toward the normal direction of the side surface 64b. Thus, in the cross section circular arc shape portion of the side surface 64b, the refraction of light is suppressed. Accordingly, light emitted from the first exit surface 65d can be made uniform.

[0081] According to other features of the present application, as Figure 14 As shown, the first lens body 62a has an incident surface recess 64a formed in the first incident surface 64d. The incident surface recess 64a is blocked by the substrate 71 on which the first light source 72a is mounted. The second lens body 62b has an incident surface recess 64a formed in the second incident surface 64e. The incident surface recess 64a on the second lens body 62b side is blocked by the substrate 71 on which the second light source 72b is mounted, and is distinguished from the incident surface recess 64a on the first lens body 62a side. Thus, the loss of light emitted by the first light source 72a or the second light source 72b can be suppressed. Also, the interference of light emitted by the first light source 72a and light emitted by the second light source 72b can be suppressed. Accordingly, light can be efficiently emitted from the first exit surface 65d and the second exit surface 65e.

[0082] According to other features of the present application, as Figure 14 , 15 As shown, the first lens body 62a has an exit surface protrusion 65b protruding inward from the outer periphery of the first exit surface 65d, and the inner periphery side is in a cylindrical shape, and the outer periphery side is in a partial shape of a sphere. Thus, the exit surface protrusion 65b can refract light emitted from the exit surface protrusion 65b toward the extension direction of the first central axis 73. Thus, by light emitted from the first exit surface 65d being uniform in direction, a clear shadow can be cast on the surface of the cutting member W.

[0083] According to other features of the present application, as Figure 15 , Figure 14As shown in FIG. 6, the first lens body 62a has a cylindrical exit face convex portion 65b. The exit face convex portion 65b has a central concave portion 65c at the axial center thereof. Therefore, the thickness of the first lens body 62a can be set thinner without changing the direction of light emitted from the first exit face 65d. Therefore, the irradiation section 60 can be made compact.

[0084] According to other features of the present application, as shown in Figure 15 , Figure 14 As shown in FIG. 6, the first exit face 65d of the first lens body 62a has a circular arc-shaped concave portion 65a that is in a circular arc shape so as to surround the outer periphery of the exit face convex portion 65b. Therefore, the thickness of the first lens body 62a can be set thinner in a relatively wide area between the exit face convex portion 65b and the first outer periphery 65f without changing the direction of light emitted from the first exit face 65d. Therefore, the irradiation section 60 can be made compact and light-weight.

[0085] According to other features of the present application, as shown in Figure 16 , Figure 4 As shown in FIG. 6, the first lens body 62a has a leg portion 67 that extends sideways from the first outer periphery 65f of the first exit face 65d. Therefore, the light within the first lens body 62a can be suppressed from leaking out from the leg portion 67. Therefore, the loss of light irradiated by the first light source 72a can be suppressed.

[0086] According to other features of the present application, as shown in Figures 18-22 As shown in FIG. 6, the cutting machine main body 10 can be swung in the up-down direction with respect to the base 2 on which the cut member W is placed, with the up-down swing shaft 10a as the center. When the cutting machine main body 10 is at the upper dead point, the irradiation section 60 irradiates a position that is further forward from the up-down swing shaft 10a than the position directly below the output shaft 23 that is the rotational center of the cutter 11, in a virtual plane S that passes through the lower end of the cutter 11 and corresponds to the upper surface of the cut member W. Therefore, the shadow of the cutter 11 can be reflected in a position that is easily seen by a user located in front of the cutting machine 1.

[0087] Next, a second embodiment of the present application will be described with reference to Figure 18 The cutting machine 80 of the second embodiment has a lens connecting body 82 of an irradiation section 81 as shown in FIG. 8, instead of the lens connecting body 61 of the irradiation section 60 shown in FIG. 6. The lens connecting body 82 is a member that connects two lens bodies 83, a first lens body 83a and a second lens body 83b, into one member. The lens connecting body 82 has three leg portions 88. The leg portions 88 have cylindrical columnar portions 88b that can be inserted into the through holes 71c (see FIG. 7) of the substrate 71. Figure 11 Figure 8 As shown in FIG. 8, the first lens body 83a has a cylindrical exit face convex portion 85b. The exit face convex portion 85b has a central concave portion 85c at the axial center thereof. Therefore, the thickness of the first lens body 83a can be set thinner without changing the direction of light emitted from the first exit face 85d. Therefore, the irradiation section 81 can be made compact. Figure 22 As shown in FIG. 8, the first exit face 85d of the first lens body 83a has a circular arc-shaped concave portion 85a that is in a circular arc shape so as to surround the outer periphery of the exit face convex portion 85b. Therefore, the thickness of the first lens body 83a can be set thinner in a relatively wide area between the exit face convex portion 85b and the first outer periphery 85f without changing the direction of light emitted from the first exit face 85d. Therefore, the irradiation section 81 can be made compact and light-weight.

[0088] As shown in FIG. 8, the first lens body 83a has a leg portion 87 that extends sideways from the first outer periphery 85f of the first exit face 85d. Therefore, the light within the first lens body 83a can be suppressed from leaking out from the leg portion 87. Therefore, the loss of light irradiated by the first light source 82a can be suppressed.​Figure 10 As shown, the first lens body 83a is centered on a first central axis 89 that passes through the center 72c of the first light source and is perpendicular to the surface of the first light source 72a. The second lens body 83b is centered on a second central axis 90 that passes through the center 72d of the second light source and is perpendicular to the surface of the second light source 72b. The first central axis 89 and the second central axis 90 extend in the same direction. The first light source 72a and the second light source 72b are positioned relative to the substrate 71 and the cutting tool 11 (see reference). Figure 18 The first lens body 83a is arranged in the same positional relationship as the cutting machine 1. The second lens body 83b is formed symmetrically with the first lens body 83a. In the following description, for the repeated structures in the first lens body 83a and the second lens body 83b, only one side will be described in detail.

[0089] like Figure 22 , Figure 19 As shown, the first lens body 83a is a generally conical shape whose diameter increases from the incident surface 85 side toward the exit surface 86 side. The first incident surface 85c and the first exit surface 86a of the first lens body 83a have an outer periphery with an arcuate shape centered on a first central axis 89. The second incident surface 85d and the second exit surface 86b of the second lens body 83b have an outer periphery with an arcuate shape centered on a second central axis 90.

[0090] like Figure 22 , Figure 22 As shown, the first lens body 83a has a planar substrate abutment surface 84 on its end face on the incident surface 85 side. The substrate abutment surface 84 abuts against the surface of the substrate 71. The incident surface 85 includes a first incident surface 85c on the side of the first lens body 83a and a second incident surface 85d on the side of the second lens body 83b. The first incident surface 85c has an incident surface recess 85a that is axially recessed from the substrate abutment surface 84 toward the first central axis 89. The incident surface recess 85a is recessed into a generally cylindrical shape centered on the first central axis 89. The first light source 72a is housed in the incident surface recess 85a with the center 72c of the first light source positioned on the first central axis 89.

[0091] like Figure 22 As shown, the second light source 72b is housed in the incident surface recess 85a on the side of the second lens body 83b with the center 72d of the second light source positioned on the second central axis 90. By bringing the substrate 71 into contact with the substrate abutment surface 84, both incident surface recesses 85a are sealed in the state of housing either the first light source 72a or the second light source 72b. The incident surface recess (first incident surface recess) 85a on the side of the first lens body 83a and the incident surface recess (second incident surface recess) 85a on the side of the second lens body 83b are separated by the substrate abutment surface 84 between them.

[0092] like Figure 21As shown, at least a portion of the side surface 85b of the incident surface recess 85a includes a cross-sectional arc shape centered on the center 72c of the first light source in a cross-section passing through the first central axis 89. The cross-sectional arc shape of the side surface 85b is mainly located below the surface of the first light source 72a. The bottom surface of the incident surface recess 85a is formed as a spherical protrusion extending towards the first light source 72a with the first central axis 89 as its center. Both the incident surface recess 85a and the side surface 85b are incident surfaces 85 into which light emitted from the LED 72 enters the lens body 83.

[0093] like Figure 21 As shown, the exit surface 86 includes a first exit surface 86a on the side of the first lens body 83a and a second exit surface 86b on the side of the second lens body 83b. The first exit surface 86a has a first outer periphery 86d in an arc shape centered on a first central axis 89. A first outermost peripheral portion 86f on the first outer periphery 86d is located at the position farthest from the first central axis 89 and has a first distance r1 between it and the first central axis 89. The second exit surface 86b has a second outer periphery 86e in an arc shape centered on a second central axis 90. A second outermost peripheral portion 86g on the second outer periphery 86e is located at the position farthest from the second central axis 90 and has a second distance r2 between it and the second central axis 90. Any point on the arc-shaped first outer periphery 86d and the second outer periphery 86e corresponds to the first outermost peripheral portion 86f and the second outermost peripheral portion 86g.

[0094] like Figure 18 As shown, the distance r3 between the first central axis 89 and the second central axis 90 is less than the sum of the first distance r1 and the second distance r2. Therefore, when viewed from the direction of the first central axis 89, the first exit surface 86a and the second exit surface 86b are shapes in which the central portions of two arc shapes partially overlap. The first outer perimeter 86d and the second outer perimeter 86e intersect each other at their respective ends. The first outer perimeter 86d is an arc shape with a central angle A1 centered on the first central axis 89. The second outer perimeter 86e is an arc shape with a central angle A1 centered on the second central axis 90. The central angle A1 is greater than 180° and less than 360°.

[0095] like Figure 22 , Figure 18 As shown, the first lens body 83a has an exit surface protrusion 86c that protrudes axially toward the first central axis 89 at a position radially inward from the first outer periphery 86d. The exit surface protrusion 86c is spherical in shape centered at a predetermined point on the first central axis 89. The exit surface protrusion 86c is the exit surface 86 from which the light emitted by the LED 72 exits.

[0096] like Figure 22 , Figure 17As shown, the first lens body 83a has a generally conical outer peripheral surface 87 connecting the outer peripheral end of the substrate abutment surface 84 and the first outer peripheral edge 86d. The outer peripheral surface 87 is an outer reflecting surface 87a within the first lens body 83a that reflects light towards the inside of the first lens body 83a. The diameter of the outer reflecting surface 87a increases with respect to the first central axis as it moves from the first incident surface 85c towards the first exit surface 86a. Furthermore, the outer reflecting surface 87a is formed in a convex arc shape protruding outwards in a cross-section passing through the first central axis 89. The outer reflecting surface 87a is also formed in a cross-section orthogonal to the first central axis 89 by a cross-sectional arc line 87b with an arc-shaped outer peripheral edge. The shape of the cross-sectional arc line 87b is similar to... Figure 22 The cross-sectional arc 66b shown is the same.

[0097] like Figure 19 As shown, light irradiated from the center 72d of the second light source 72b enters the lens body 83 through the bottom or side surface 85b of the incident surface recess 85a. Light entering from the bottom surface of the incident surface recess 85a is refracted in two stages: by the bottom surface of the incident surface recess 85a and by the outer peripheral surface of the exit surface protrusion 86c. Accordingly, light exits axially toward the second central axis 90 from the outer peripheral surface of the exit surface protrusion 86c. Light entering from the side surface 85b travels in the normal direction of the side surface 85b and is reflected axially toward the second central axis 90 by the outer reflecting surface 87a. Then, light exits from the region between the exit surface protrusion 86c and the second outer peripheral edge 86e while maintaining the axial direction of the second central axis 90. Thus, light exiting from the second exit surface 86b exits in a state aligned with the axial direction of the second central axis 90. The light irradiated by the first light source 72a and emitted from the first emission surface 86a is also emitted in a manner consistent with the axial direction of the first central axis 89.

[0098] like Figure 20 , ​ As shown, the leg 88 has a plate-shaped outer extension 88a extending laterally from the substrate abutment surface 84 toward the lens body 83. A columnar portion 88b extends upward from the outer extension 88a. Therefore, the leg 88 is positioned off-center from the path of light passing through the lens body 83.

[0099] In the cutting machines 1, 80 of the above-described embodiments, various modifications can be added. The lens connecting body 61, 82 having the first exit surface 65d, 86a and the second exit surface 65e, 86b that are circular when viewed in the axial direction of the first center axis 73, 89 is exemplified. Instead of this, a first exit surface and a second exit surface that are, for example, elliptical, oblong combined with two semicircles, and rectangular when viewed in the axial direction of the first center axis 73, 89 can be provided. The structure in which the first lens body 62a, 83a and the second lens body 62b, 83b are provided by one member is exemplified. Instead of this, the first lens body and the second lens body can be provided by different members. The shapes of the first lens body and the second lens body can be different from each other.

[0100] The first center axis 73, 89 and the second center axis 74, 90 that are parallel to each other are exemplified. Instead of this, for example, a configuration relationship in which the first center axis and the second center axis cross each other toward the cutter 11 side can be adopted. The first light source center 72c and the second light source center 72d are not limited to the geometric centers of the first light source 72a and the second light source 72b, and include the light emission centers that emit light most brightly. The first center axis 73, 89 and the second center axis 74, 90 that extend perpendicularly to the surfaces of the first light source 72a and the second light source 72b are exemplified. The configuration relationship of the first light source 72a, the second light source 72b, and the first center axis 73, 89, the second center axis 74, 90 is not limited to this. For example, a case in which the main irradiation direction of the first light source is parallel to the first center axis is also included in the structure in which the first center axis is perpendicular to the first light source. Alternatively, for example, a configuration relationship of the first light source and the first center axis when light is emitted in a manner parallel to the first center axis from any position of the first exit surface is also included in the structure in which the first center axis is perpendicular to the first light source.

[0101] The lens body 62 in which the area of the exit surface 65 is larger than the area of the entrance surface 64 is exemplified. Instead of this, a lens body in which the area of the exit surface is smaller than the area of the entrance surface can be adopted. The cross-sectional shape of the outer reflection surface 66a, 87a, the spherical convex portion 64c, the exit surface convex portion 65b, 86c, and the like is not limited to a circular arc shape that is a true circle, and for example, can be another curved shape such as an elliptical shape, a parabolic shape, a spindle shape, and the like. Instead of an LED, for example, a lamp or the like can be used. The present application is not only applicable to a sliding circular saw, but also to a table circular saw, a portable circular saw, and the like in which the cutting machine main body does not have a sliding function.

Claims

1. A cutting machine characterized by comprising: a cutting machine main body and an irradiation section, the cutting machine main body has a circular disk-shaped cutter; the irradiation section irradiates light toward the cutter from a radially outer side of the cutter, the irradiation section has a first light source, a second light source, a first lens body, and a second lens body, the first light source and the second light source are disposed across a virtual plane including the cutter; the first lens body has a first entrance surface into which light from the first light source is incident and a first exit surface from which light is emitted; the second lens body has a second entrance surface into which light from the second light source is incident and a second exit surface from which light is emitted, the first exit surface has a first outermost peripheral portion having a first distance farthest from a first center axis that passes through a first light source center of the first light source and is perpendicular to the first light source, the second exit surface has a second outermost peripheral portion having a second distance farthest from a second center axis that passes through a second light source center of the second light source and is perpendicular to the second light source, the first light source and the second light source are disposed in such a manner that a distance between the first center axis and the second center axis is smaller than a sum of the first distance and the second distance.

2. The cutting machine according to claim 1, characterized in that: the first lens body and the second lens body are one component.

3. The cutting machine according to claim 1 or 2, characterized in that: the first exit surface has a first outer peripheral edge having a circular arc shape and a length in a range of more than 180° centered on the first center axis, the second exit surface has a second outer peripheral edge having a circular arc shape and a length in a range of more than 180° centered on the second center axis, and the first outer peripheral edge and the second outer peripheral edge intersect.

4. The cutting machine according to any one of claims 1 to 3, characterized in that: the first lens body has an outer side reflection surface that reflects light incident from the first entrance surface and passing through inside the first lens body toward the first exit surface, the outer side reflection surface is away from the first center axis as it goes from the first entrance surface toward the first exit surface, and has a convex curve shape that is convex toward the outside in a cross section passing through the first center axis.

5. The cutting machine according to claim 4, characterized in that: the cross section of the outer side reflection surface has a circular arc shape and has a length in a range of more than 180° centered on the first center axis at any position from the first entrance surface to the first exit surface.

6. The cutting machine according to any one of claims 1 to 5, characterized in that: the first lens body has an entrance surface recess and a spherical convex portion, wherein the entrance surface recess is formed in the first entrance surface, and the spherical convex portion is a spherical shape that is convex toward the first light source from a bottom surface of the entrance surface recess.

7. The cutting machine according to claim 6, characterized in that: At least a part of a side surface of the first incident surface recess is in a circular arc shape centered on the center of the first light source in a cross section passing through the first central axis.

8. The cutting machine according to any one of claims 1 to 7, wherein The first lens body has a first incident surface recess formed in the first incident surface, the first incident surface recess being blocked by a substrate on which the first light source is mounted, The second lens body has a second incident surface recess formed in the second incident surface, the second incident surface recess being blocked by a substrate on which the second light source is mounted, and being separate from the first incident surface recess.

9. The cutting machine according to any one of claims 1 to 8, wherein The first lens body has an exit surface protrusion that protrudes inward of an outer periphery of the first exit surface and is in a cylindrical or partial spherical shape.

10. The cutting machine according to claim 9, wherein The first lens body has the exit surface protrusion in a cylindrical shape, and has a central recess at an axial center of the exit surface protrusion.

11. The cutting machine according to claim 9, wherein The first exit surface of the first lens body has a circular arc-shaped recess that is formed in a circular arc shape so as to surround an outer periphery of the exit surface protrusion.

12. The cutting machine according to any one of claims 1 to 11, wherein The first lens body has a leg portion that extends laterally from an outer periphery of the first incident surface or the first exit surface.

13. The cutting machine according to any one of claims 1 to 12, wherein The cutting machine body is swingable in a vertical direction with a vertical swing shaft as a center with respect to a base on which a cut object is placed, When the cutting machine body is at a top dead center, the irradiation portion irradiates a portion that is farther from the vertical swing shaft than a position directly below the center of rotation of the cutter in a virtual plane that passes through the lower end of the cutter and corresponds to an upper surface of the cut object.

Images