Cutting machine

Abstract

To provide a technique which can suppress rattling of a cutting machine during tilting operation to smoothly tilt a body of the cutting machine relative to a base.SOLUTION: A cutting machine comprises: a base with a contact surface; a cutting machine body; and at least one tilting support member which supports the cutting machine body to be tiltable around a first axis line relative to the base. At least one tilting support member includes: a tilting plate which is fixed to the cutting machine body; an angular plate which is arranged facing the tilting plate and fixed to the base; and a link arm which is constituted to connect the tilting plate with the angular plate. When the cutting machine body is tilted, the tilting plate tilts with the cutting machine body, opposed surfaces of the tilting plate and the angular plate have slide contact to each other, and the link arm tilts in conjunction with tilting of the cutting machine body around a second axis line in parallel with the first axis line.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to cutting machines. [Background technology]

[0002] There is known a cutting machine having a substantially rectangular base having an abutment surface for abutting against a workpiece and a cutting machine body on which a cutting tool is attached, and capable of cutting with the cutting tool inclined relative to the workpiece (oblique cutting) by tilting the cutting machine body relative to the base. As one type of such cutting machine, Patent Document 1 shows a plunge-type circular saw. The circular saw of Patent Document 1 includes an angular plate fixed to the base and a front bracket fixed to a processing machine body having a cutting tool. Two arc-shaped convex rails are provided on the front surface of the front bracket, with the tilting support shaft as the center, and two arc-shaped concave rails are provided on the angular plate to engage with the two convex rails. When the processing machine body is tilted relative to the base, the convex rails and the concave rails slide against each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-128026 A [Patent Document 2] JP 2018-176310 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the circular saw described in Patent Document 1, as the tilt (incline) angle of the processing machine body relative to the base increases, the engagement portion between the convex rail and the concave rail decreases. This reduction in the engagement portion causes rattling between the processing machine body and the base, which may make it difficult to tilt the processing machine body smoothly relative to the base. This problem is not limited to circular saws, but can occur in common with cutting machines configured to tilt the cutting machine body, to which the cutting tool is attached, relative to the base. Therefore, a technology is required that can suppress rattling during tilting operation and tilt the cutting machine body smoothly relative to the base. [Means for solving the problem]

[0005] According to one aspect of the present disclosure, a cutting machine is provided. The cutting machine includes a base, a cutting machine body, and at least one tilting support. The base has an abutment surface for abutting against a workpiece. The cutting machine body includes an electric motor configured to provide a rotational drive force to a cutting tool. The cutting machine body is disposed on a second side with respect to the abutment surface of the base. The at least one tilting support is configured to support the cutting machine body so as to be tiltable about a first axis with respect to the base. The at least one tilting support includes a tilting plate, an angular plate, and a link arm. The tilting plate is configured to protrude toward the second side with respect to the base. The tilting plate is fixed to the cutting machine body. The angular plate is configured to protrude toward the second side with respect to the base. The angular plate is disposed opposite the tilting plate in a direction parallel to the first axis. The angular plate is disposed farther from the tilting plate with respect to the cutting machine body in a direction parallel to the first axis. The angular plate is fixed to the base. The link arm is configured to connect the tilting plate and the angular plate. When the cutting machine body is tilted, the tilting plate tilts integrally with the cutting machine body, and the opposing surfaces of the tilting plate and the angular plate slide against each other. The link arm is configured to tilt about a second axis parallel to the tilting axis in conjunction with the tilting movement of the cutting machine body.

[0006] According to this aspect, the tilt plate and the angular plate are connected by a link arm, and the link arm tilts in conjunction with the cutting machine body around a second axis parallel to the first axis which is the tilt center of the cutting machine body. The aspect in which the link arm connects the tilt plate and the angular plate is maintained regardless of the tilt angle. Therefore, it is possible to suppress rattling between the tilt plate and the angular plate caused by an increase in the tilt angle of the cutting machine body. Therefore, it is possible to smoothly tilt the cutting machine body relative to the base. [Brief description of the drawings]

[0007] [Figure 1] 1 is a perspective view showing a circular saw according to a first embodiment, with the main body at the top dead center. [Diagram 2] FIG. 2 is a front view of the circular saw with the body at bottom dead center. [Diagram 3] FIG. 3 is a top view of the circular saw corresponding to FIG. 2. [Figure 4] FIG. 13 is an enlarged view of the vicinity of the front tilt support part, in which the angular plate is indicated by a dashed line, in which only the cutting tool is tilted at a plurality of tilt angles to explain the first axis. [Diagram 5] This is a perspective view of the vicinity of the front tilt support part, and the tilt angle of the cutting machine body is 0°. [Figure 6] FIG. 13 is a rear view of the front tilt support portion and the link plate. [Figure 7] This is an enlarged view of the area near the front tilt support part, and the tilt angle of the cutting machine body is 15°. [Figure 8] This is an enlarged view of the area near the front tilt support part, and the tilt angle of the cutting machine body is 30°. [Figure 9] This is an enlarged view of the area near the front tilt support part, and the tilt angle of the cutting machine body is 45°. [Figure 10] FIG. 11 is a perspective view showing a circular saw according to a second embodiment, with the main body at the bottom dead center. [Figure 11] FIG. 11 is an enlarged view of the vicinity of the front tilt support part in the second embodiment, in which the tilt angle of the cutting machine body is 0°. [Figure 12] FIG. 11 is a rear view of the front tilt support portion and the link plate of the second embodiment. [Figure 13] 12 is a cross-sectional view taken along the line XII-XII of FIG. 11. [Figure 14] FIG. 11 is an enlarged view of the vicinity of the front tilt support part in the second embodiment, in which the tilt angle of the cutting machine body is 45°. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] In one non-limiting embodiment of the present disclosure, the second axis may be provided on the second side relative to the abutment surface of the base. According to this embodiment, the cutting tool attached to the cutting machine body can be properly supported by the link arm and the member that constitutes the rotation (tilting) axis of the link arm, so that even if a cutting tool with a relatively large mass is attached to the cutting machine body, the cutting machine body can be smoothly tilted relative to the base.

[0009] In addition to or instead of the above embodiment, the first axis may be an imaginary axis provided on a first side opposite to the second side with respect to the contact surface of the base. According to this embodiment, the first axis, which is the center of tilting of the cutting machine body, is a virtual axis provided on the opposite side of the base from the side where the cutting machine body is located, that is, on the work side, so that it is possible to prevent the cutting position of the work from shifting due to the tilt angle.

[0010] In addition to or instead of the above embodiment, the at least one tilt support part may include an arc groove and a guide pin. The arc groove may be provided on one of the tilt plate and the angular plate, and may be formed in an arc shape along the tilt direction of the cutting machine body. The guide pin may have a first portion fixed to the other of the tilt plate and the angular plate, and a second portion protruding toward the arc groove. The guide pin may be configured such that the second portion slides along the arc groove when the tilt plate is tilted. According to this embodiment, when the tilt plate is tilted in conjunction with the cutting machine body, the second portion of the guide pin moves along the arc groove. Moreover, regardless of the tilt angle of the cutting machine body, movement of the guide pin in a direction other than the direction along the arc groove (i.e., the tilt direction) is restricted by the arc groove. Therefore, the arc groove and the guide pin support (guide) the tilt of the cutting machine body about the first axis, while suppressing rattling between the tilt plate and the angular plate caused by an increase in the tilt angle of the cutting machine body. Therefore, the cutting machine body can be tilted more smoothly relative to the base. In this embodiment, the arc center of the arc groove may be on the first axis line. The arc groove and the guide pin may be configured to cooperate with each other to tilt the cutting machine body about the first axis line.

[0011] In addition to or instead of the above embodiment, the link arm may have a base end provided on the second axis and a tip end opposite to the base end. The tip end may be fixed to the tilting plate on a side closer to the first axis than the arc groove and configured to tilt integrally with the tilting plate. According to this embodiment, the space on the tilt plate and the angular plate closer to the first axis than the arc groove can be effectively utilized.

[0012] In addition to or instead of the above embodiment, the cutting machine may further include an angle fixing unit capable of fixing the tilt angle of the cutting machine body relative to the base. The angle fixing unit may include a fixing groove, an angle fixing shaft, and an operating unit. The fixing groove may be provided in the angular plate and formed in an arc shape along the tilting direction of the cutting machine body. The angle fixing shaft may extend parallel to the first axis and be inserted into the fixing groove so as to be fixed to the tilting plate. The operating unit may be connected to the angle fixing shaft and configured to fix the tilting plate and the angular plate in a direction parallel to the first axis by a user's operation. Furthermore, the arc groove of the tilt support unit may be provided closer to the first axis than the fixing groove. According to this embodiment, the inclination angle of the cutting body relative to the base can be fixed, and the arc groove can be disposed in the space on the tilt plate and the angular plate closer to the first axis than the fixed groove. In this embodiment, the center of the arc of the fixing groove may be on the first axis.

[0013] In addition to or instead of the above embodiment, the arc groove may be the fixed groove provided in the angular plate, and the guide pin may be the angle fixed shaft. According to this embodiment, by utilizing the arc-shaped fixing groove for fixing the tilt angle and the angle fixing shaft, the tilting of the cutting machine body around the first axis can be supported (guided) while the rattle between the tilt plate and the angular plate caused by the increase in the tilt angle of the cutting machine body can be suppressed. Therefore, the structure of the tilt support part can be simplified while the cutting machine body can be smoothly tilted relative to the base. Note that in this embodiment, a portion of the angle fixing shaft corresponding to the first portion of the guide pin may be fixed to the tilting shaft, and a portion of the angle fixing shaft corresponding to the second portion of the guide pin may be configured to slide in a fixed groove when the tilting plate is tilted.

[0014] In addition to or instead of the above embodiment, the at least one tilt support may further include a guide plate formed separately from the tilt plate and the angular plate and fixed to one of the tilt plate and the angular plate. The arc groove may be provided in the guide plate. According to this embodiment, since the guide plate is separate from either the tilt plate or the angular plate, the guide plate can be made of a separate member from either the tilt plate or the angular plate, which increases the degree of freedom in the material of the part that slides due to the tilt operation.

[0015] Additionally or alternatively, the guide plate may be made of steel. According to this embodiment, it is possible to improve the wear resistance of the portion that slides during the tilting operation.

[0016] In addition to or instead of the above embodiment, the at least one tilt support may further include a first pin and a second pin. The first pin may be disposed at a first end of the arc groove provided in the guide plate. The second pin may be disposed at a second end of the arc groove provided in the guide plate, the second end being opposite to the first end. The first pin and the second pin may be configured to fix the guide plate to the one of the tilt plate and the angular plate. According to this embodiment, the guide plate can be fixed to one of the tilt plate and the angular plate with a simple structure.

[0017] In addition to or instead of the above embodiment, the guide pin may have a shaft body and a bearing provided around the shaft body. According to this embodiment, the guide pin can slide smoothly along the arc groove, which can prevent wear on the sliding portion caused by the tilting operation.

[0018] In addition to or instead of the above embodiment, the at least one tilt support may include a support shaft fixed to the angular plate and having the second axis as a central axis. The base end of the link arm may be provided on the support shaft. The tip end of the link arm may be provided on a tip shaft fixed to the tilt plate. According to this embodiment, the tilt plate and the angular plate can be connected via the support shaft, the link arm, and the tip shaft.

[0019] In addition to or instead of the above embodiment, the cutting machine may be a portable cutting machine having a grip portion that can be held by a user. According to this embodiment, even in the case of a portable cutting machine in which the user is likely to apply force to the cutting machine body during tilting operations, rattling during tilting operations is suppressed, allowing the user to perform tilting operations smoothly.

[0020] First Embodiment A first embodiment of the present disclosure will be described below with reference to Fig. 1 to Fig. 9. In this embodiment, a plunge circular saw (hereinafter simply referred to as "circular saw 10"), which is a type of portable cutting machine, will be illustrated as an example of a cutting machine.

[0021] First, a schematic configuration of the circular saw 10 will be described. The circular saw 10 includes a base 20, a cutting machine body 30 to which a cutting tool 35 is attached, a front tilt support portion 6f, and a rear tilt support portion 6r. The cutting machine body 30 is disposed on a second side relative to the base 20. The circular saw 10 is configured to be able to cut a workpiece W (see FIG. 2) disposed on the opposite side (first side) of the base 20 to the cutting machine body 30.

[0022] For the sake of convenience, the direction parallel to the cutting (cutting) direction of the circular saw 10 is defined as the front-rear direction of the circular saw 10, the destination to which the workpiece W is transferred relative to the circular saw 10 is defined as the rear side of the circular saw 10, and the opposite side is defined as the front side of the circular saw 10. In this embodiment, the rear side is the side where the user is when holding the circular saw 10 and cutting the workpiece W, and the opposite side is the front side of the circular saw 10. In addition, the side where the workpiece W is placed relative to the base 20 is defined as the lower side of the circular saw 10, and the opposite side is defined as the upper side of the circular saw 10. The upper side is the side where the cutting machine body 30 is located. Furthermore, the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction of the circular saw 10. In the left-right direction, the right side when viewed from the rear side to the front side is defined as the right side of the circular saw 10, and the opposite side is defined as the left side of the circular saw 10.

[0023] The cutting machine body 30 is tiltable relative to the base 20 around a tilt axis C (see FIG. 4). FIGS. 1 to 6 show the cutting machine body 30 with a tilt angle of 0°, and FIGS. 7, 8, and 9 show the cutting machine body 30 with tilt angles of 15°, 30°, and 45°, respectively. The tilt angle of the cutting machine body 30 is also the tilt angle of the cutting tool 35. The tilt axis C is parallel to the front-rear direction. When the tilt angle is 0°, the side of the cutting tool 35 is perpendicular to the left-right direction.

[0024] The base 20 is formed in a substantially rectangular shape. The longitudinal direction of the base 20 is the front-rear direction. The base 20 has a contact surface 21 for contacting the workpiece W. In this embodiment, the contact surface 21 corresponds to the lower surface of the base 20. However, when a long ruler is used together with the circular saw 10 to linearly cut the workpiece W, the base 20 may be disposed so that the contact surface 21 contacts the long ruler.

[0025] The cutting machine main body 30 includes a main body 31 and a cover 40. The main body 31 is basically disposed on the upper side of the base 20. The main body 31 includes a motor housing 32 that houses an electric DC motor 33 (see FIG. 1), a gear housing 34, and a grip 36 for a user to hold by hand. As shown in FIG. 3, a rotation axis AX1 of the motor 33 extends in the left-right direction. A reduction gear and an output shaft having an axis AX2 extending in the left-right direction are housed in the gear housing 34. The motor 33 rotates the cutting tool 35 around the axis AX2 via the reduction gear and the output shaft. In this embodiment, a circular saw blade called a chip saw is used as the cutting tool 35. In this embodiment, the gear housing 34 is formed integrally with the motor housing 32. The grip 36 is provided with a trigger for starting and stopping the motor 33.

[0026] The cover 40 is disposed on the upper surface 22 side of the base 20 and on the edge of the base 20 in the left-right direction. In this embodiment, the cover 40 is disposed on the right edge of the base 20. The cutting tool 35 has a disk shape and is at least partially housed inside the cover 40. Specifically, a circular arc-shaped through hole 43 (see FIG. 1) that penetrates the left side wall 41 in the left-right direction is formed in the left side wall 41 of the cover 40. The output shaft passes through this through hole 43 and extends to the inside of the cover 40. The tip of the output shaft functions as a mounting part 45 (see FIG. 1 and FIG. 3) to which the cutting tool 35 is detachably mounted.

[0027] As shown in FIG. 1, a body support part 50 is provided below the body part 31 and above the base 20. The body support part 50 supports the body part 31 on the base 20 so that the body part 31 can be swung in the up-down direction. The body support part 50 includes a plate-shaped base part 51 extending in the front-rear direction, a holding part 52, and a vertical swing shaft 53. The base part 51 extends in the left-right direction from the lower edge of the cover 40 to the side of the body part 31 (the lower side of the gear housing 34). As shown in FIG. 1, the lower surface of the base part 51 abuts against the upper surface 22 of the base 20 when the inclination angle of the cutting machine body 30 is 0°. The holding part 52 is provided at the rear part of the base part 51. The holding part 52 is formed in a wall shape facing the left side wall 41 of the cover 40. The axis AX3 of the vertical swing shaft 53 extends in the left-right direction. The vertical swing shaft 53 is inserted into a through-hole (not shown) that penetrates in the left-right direction provided at the rear of the main body 31 (gear housing 34). The right end of the vertical swing shaft 53 is held by the left side wall 41 of the cover 40, and the left end is held by the holding portion 52. This allows the main body 31 to swing up and down around the axis line AX3.

[0028] The main body 31 can be displaced between the top dead center shown in FIG. 1 and the bottom dead center shown in FIG. 2 by being swung up and down about the axis AX3. The top dead center is a position where the entire cutting tool 35 is located above the lower surface 21 of the base 20 and the entire cutting tool 35 is housed within the cover 40. The bottom dead center is a position where the cutting tool 35 protrudes downward beyond the lower surface 21 of the base 20 and protrudes most from the lower surface 21. A biasing spring 39 is provided between the main body 31 and the base 51. The biasing spring 39 constantly biases the main body 31 from the bottom dead center side toward the top dead center side.

[0029] The cutting machine body 30 further includes a battery mounting section 37 (see FIG. 1) to which the battery 200 is detachably attached. The battery mounting section 37 is provided on the rear side of the motor 33. The battery mounting section 37 includes a pair of guide rails, a hook engaging section, and a terminal, and has a well-known configuration to allow the battery 200 to be detachably attached.

[0030] The front tilt support part 6f and the rear tilt support part 6r are configured to support the cutting machine body 30 so that it can tilt with respect to the base 20. The tilt axis C is a virtual axis extending in the front-rear direction. As shown in FIG. 4, in this embodiment, the tilt axis C is disposed below the lower surface 21 of the base 20. The tilt axis C approximately coincides with the lower surface of the long ruler 23. The tilt axis C is included in the lower surface of the long ruler 23, or is included in a virtual plane including the lower surface. The tilt axis C is disposed at a position overlapping with the left side surface of the cutting tool 35. The tilt axis C is disposed at a position overlapping with the left side surface of the cutting tool 35 at all tilt angles. In this embodiment, the tilt axis C is virtually set at a position approximately coincident with the lower surface of the long ruler 23 so that the left-right position of the cutting tool 35 on the upper surface of the workpiece W does not shift at any tilt angle. The front tilt support portion 6f and the rear tilt support portion 6r are collectively referred to simply as the tilt support portions 6f and 6r.

[0031] 4, the front tilt support portion 6f mainly includes an angular plate 61, a tilt plate 71, and a link arm 83. The front tilt support portion 6f further includes a guide plate 64, a guide pin 73, and a support shaft 81.

[0032] The angular plate 61 is provided on the upper surface 22 side of the base 20 and at the front portion of the base 20. The angular plate 61 is formed parallel to the up-down and left-right directions (i.e., perpendicular to the front-rear direction) and is fixed to the base 20. The angular plate 61 protrudes upward from the base 20. The angular plate 61 has a substantially quarter-circular arc shape centered on the tilt axis C. The angular plate 61 is formed from aluminum, synthetic resin, or the like.

[0033] An arc-shaped through-hole 65 is formed near the arc-shaped outer edge 67 of the angular plate 61, penetrating the angular plate 61 in the front-rear direction and aligned with the tilting direction T (see FIG. 4) of the cutting machine body 30. A shaft 92 for fixing the tilt angle is inserted into the through-hole 65. The shaft 92 has an outer diameter such that a gap is formed between the shaft 92 and the through-hole 65. The center of the arc of the through-hole 65 is on the tilting axis C or in the vicinity of the tilting axis C including on the tilting axis C.

[0034] As shown in FIG. 6, a guide plate 64 is disposed on the rear surface 62 of the angular plate 61 on the inner side of the through hole 65 (i.e., on the side closer to the tilt axis C). The guide plate 64 is fixed to the angular plate 61. The guide plate 64 has an arc-shaped groove 641 along the tilt direction T of the cutting machine body 30. In this embodiment, the guide plate 64 is made of steel. In this embodiment, the arc groove 641 is a portion that penetrates the guide plate 64 in the front-rear direction. The arc groove 641 can also be said to be a long groove that extends in an arc shape. The center of the arc of the arc groove 641 is on the tilt axis C or in the vicinity of the tilt axis C including on the tilt axis C.

[0035] As shown in Fig. 6, a recess 63 recessed forward is formed on the rear surface 62 of the angular plate 61, on the inside of the through hole 65. The guide plate 64 is disposed in the recess 63. A first pin 642 and a second pin 643 are disposed on both ends (a first end 646 and a second end 647) of the arc of the arc groove 641, respectively. The first pin 642 and the second pin 643 are press-fitted into holes 612 and 613, respectively, which penetrate the angular plate 61 in the front-rear direction (see Fig. 2). The first pin 642 and the second pin 643 position the guide plate 64 with respect to the angular plate 61.

[0036] A hole penetrating in the front-rear direction is formed in the arc-shaped corner 66 (see FIG. 6) of the angular plate 61. A support shaft 81 is disposed in this hole. The central axis (axis D) of the support shaft 81 extends in the front-rear direction. The front end of the support shaft 81 is press-fitted into the base 20 (angular plate 61). This fixes the support shaft 81 to the base 20. As shown in FIG. 4, the axis D of the support shaft 81 is located above the tilt axis C. In this embodiment, the support shaft 81 itself overlaps with the tilt axis C in a plan view (when viewed from above or below). In other words, the support shaft 81 itself and the tilt axis C overlap in the left-right direction. The axis D is shifted 1 mm toward the motor 33 from the tilt axis C in the left-right direction.

[0037] As shown in Fig. 6, the link arm 83 is disposed further inward (closer to the tilt axis C) than the guide plate 64 in the recess 63. A base end 84 of the link arm 83 is disposed rearward (directly behind) the corner 66. A hole 841 is formed in the base end 84, penetrating it in the front-to-rear direction. The rear end of the support shaft 81 is loosely inserted into this hole 841 with only a very small gap. Therefore, the link arm 83 and the support shaft 81 can rotate smoothly.

[0038] As shown in FIG. 1, the tilting plate 71 is provided in front of the base 51 and directly behind the angular plate 61. The tilting plate 71 protrudes upward from the base 51. The tilting plate 71 has an approximately quarter-circular arc shape centered on the tilting axis C. The angular plate 61 and the tilting plate 71 have approximately the same arc shape. As shown in FIG. 5, a front surface 72 (opposing surface) of the tilting plate 71 slidably contacts the rear surface 62 of the angular plate 61. The tilting plate 71 is made of aluminum, magnesium, or the like.

[0039] The tilt plate 71 is fixed to the cover 40. In this embodiment, the tilt plate 71 is formed integrally with the left side wall 41, base 51, holding portion 52, and tilt plate 71 of the rear tilt support portion 6r of the cover 40. As shown in Fig. 5, the right side wall 42 of the cover 40 is fixed to the left side wall 41 and the tilt plate 71 with screws.

[0040] As shown in Fig. 5, the front surface 72 of the tilting plate 71 is provided with a shaft fixing portion 711 to which the angle fixing shaft 92 is fixed, a guide pin 73, and a link arm locking pin 75. The guide pin 73 and the link arm locking pin 75 are press-fitted into the tilting plate 71. All of these axes extend in the front-rear direction. When the cutting machine body 30 is tilted, the shaft fixing portion 711, the guide pin 73, and the link arm locking pin 75 tilt integrally with the tilting plate 71.

[0041] The shaft fixing portion 711 is a hole capable of fixing the rear end portion 93 (see FIG. 6) of the angle fixing shaft 92. The shaft fixing portion 711 is provided at a position corresponding to the through hole 65 of the angular plate 61. As shown in FIG. 4, the shaft fixing portion 711 is provided on the tilting plate 71 so as to be located directly behind the lower end portion 651 (the side closer to the base 20) of the through hole 65 when the tilt angle is 0°.

[0042] The guide pin 73 is provided further inward than the shaft fixing portion 711 of the tilting plate 71. As shown in FIG. 5, a rear portion 732 (first portion) of the guide pin 73 is fixed to the tilting plate 71 at a position corresponding to the arc groove 641 of the guide plate 64. A front portion 731 (second portion) of the guide pin 73 protrudes forward from the tilting plate 71. The guide pin 73 is provided on the tilting plate 71 so that the front portion 731 abuts against the first pin 642 when the tilt angle is 0°. The front portion 731 of the guide pin 73 has an outer diameter large enough to slide in the arc groove 641. When the tilting plate 71 is tilted together with the cutting machine body 30, the guide pin 73 slides along the arc groove 641 of the guide plate 64.

[0043] As shown in FIG. 5, the link arm locking pin 75 is provided further inward than the guide pin 73 in the tilting plate 71. A hole 851 penetrating in the front-rear direction is formed in the tip end 85 opposite to the base end 84 of the link arm 83, and the front end of the link arm locking pin 75 is loosely inserted into this hole 851 with a very small gap. Therefore, the link arm 83 and the link arm locking pin 75 can rotate smoothly. As described above, the base end 84 of the link arm 83 is disposed on the support shaft 81. Therefore, when the tilting plate 71 is tilted together with the cutting machine body 30, the link arm 83 tilts about the axis D of the support shaft 81 in conjunction with the tilting operation of the cutting machine body 30.

[0044] As shown in FIG. 5, an operation knob 91 is provided on the front surface of the angular plate 61. The operation knob 91 is attached to the front end of the shaft 92. The operation knob 91 can be rotated around the axis of the shaft 92 by manual operation by the user. The operation knob 91 is configured to fasten the tilt plate 71 and the angular plate 61 in the front-rear direction when rotated in a first direction around the axis of the shaft 92. This fixes the tilt plate 71 and the angular plate 61 in the front-rear direction, and fixes the tilt angle of the cutting machine body 30. When the operation knob 91 is rotated in the opposite direction to the first direction, the fastening between the tilt plate 71 and the angular plate 61 in the front-rear direction is released. The operation knob 91, the shaft 92, the through hole 65, and the shaft fixing portion 711 function as an angle fixing portion 9f capable of fixing the tilt angle of the cutting machine body 30 relative to the base 20.

[0045] As shown in FIG. 3, the rear tilt support part 6r is formed symmetrically with the front tilt support part 6f with respect to a virtual plane P perpendicular to the front-rear direction. The angular plate 61 of the rear tilt support part 6r is provided on the upper surface 22 side of the base 20 and in the rear part of the base 20. The tilt plate 71 of the rear tilt support part 6r is provided in the rear part of the base 51, directly in front of the angular plate 61 of the rear tilt support part 6r. The operation knob 91 of the angle fixing part 9r is provided on the rear surface of the angular plate 61 of the rear tilt support part 6r. The other configurations of the rear tilt support part 6r and the angle fixing part 9r are similar to those of the front tilt support part 6f and the angle fixing part 9f, respectively, except for the point that they are symmetrical in the front-rear direction, and therefore will not be described.

[0046] In the circular saw 10 having the above configuration, the cutting machine body 30 can be tilted in an arc-shaped tilt direction T about the tilt axis C between a position where the cutting tool 35 is perpendicular to the base 20 (FIGS. 1, 2, and 4) and a position where the cutting tool 35 is tilted at a predetermined maximum tilt angle with respect to the base 20. The tilt angle of the cutting machine body 30 is fixed by tightening the operation knob 91. The tilt angle can be confirmed by the angle scale 611 (see FIG. 1) displayed on the angular plate 61 of the front tilt support portion 6f.

[0047] With the circular saw 10 in the right-angle position (tilt angle 0°) shown in FIG. 1, the user can release the fixed relationship between the front tilt plate 71 and the angular plate 61 by loosening the operation knob 91 of the angle fixing part 9f. Similarly, the user can release the fixed relationship between the rear tilt plate 71 and the angular plate 61 by loosening the operation knob 91 of the angle fixing part 9r. This allows the cutting machine body 30 to tilt around the tilt axis C. The user can tilt the cutting machine body 30 to the right from the right-angle position (see FIGS. 1 and 2) where the cutting tool 35 is perpendicular to the base 20, as shown by the dashed line in FIG. 4.

[0048] 1 to the right, the front surface 72 of the tilting plate 71 slides against the rear surface 62 of the angular plate 61 and tilts to the right in conjunction with the cutting machine body 30. At this time, the front portion 731 of the guide pin 73 fixed to the tilting plate 71 slides against the guide plate 64 and moves along the arc groove 641 of the guide plate 64. The movement of the guide pin 73 in the up-down and left-right directions is regulated by the guide plate 64 that defines the arc groove 641. In other words, the arc groove 641 and the guide pin 73 support (guide) the cutting machine body 30 with respect to the base 20 so that the cutting machine body 30 tilts about the tilting axis C.

[0049] When the tilting plate 71 is tilted around the tilting axis C, the link arm 83 tilts around the axis D of the support shaft 81 in conjunction with the tilting of the tilting plate 71. In addition, the shaft 92 of the angle fixing part 9f moves in the through hole 65 together with the tilting plate 71. When the user tightens the operation knob 91 at a desired tilt angle, the tilting plate 71 and the angular plate 61 are tightened in the front-rear direction, and the tilt angle of the cutting machine body 30 relative to the base 20 is fixed.

[0050] In the circular saw 10 of this embodiment described above, the tilting plate 71 and the angular plate 61 are connected by the link arm 83, and the link arm 83 tilts about an axis D parallel to the tilting axis C of the cutting machine body 30. The manner in which the link arm 83 connects the tilting plate 71 and the angular plate 61 is maintained regardless of the tilt angle, so that rattling between the tilting plate 71 and the angular plate 61 caused by an increase in the tilt angle can be suppressed. Therefore, the cutting machine body 30 can be smoothly tilted relative to the base 20.

[0051] Moreover, the circular saw 10 is configured such that the cutting machine body 30 tilts relative to the base 20 about a tilt axis C, which is an imaginary axis provided below the lower surface 21 of the base 20. Therefore, it is possible to prevent the cutting position of the workpiece W from shifting due to the tilt angle.

[0052] Additionally, the axis D of the link arm 83 is the central axis of the support shaft 81. The support shaft 81 is fixed to the base 20 (angular plate 61). Therefore, the link arm 83 is tilted stably. Furthermore, in this embodiment, a virtual tilt axis C is provided below the lower surface 21 of the base 20, while the mass of the cutting tool 35 can be supported by the substantial support shaft 81, so that the cutting machine body 30 can be tilted smoothly.

[0053] The tilt support parts 6f and 6r are provided with an arc-shaped groove 641 provided on the angular plate 61 along the tilt direction T of the cutting machine body 30, and a guide pin 73 provided on the tilt plate 71. A rear part 732 of the guide pin 73 is fixed to the tilt plate 71, and a front part 731 protrudes toward the arc groove 641. When the tilt plate 71 is tilted in conjunction with the cutting machine body 30, the front part 731 of the guide pin 73 slides along the arc groove 641. Regardless of the tilt angle of the cutting machine body 30, the movement of the guide pin 73 in a direction other than the direction along the arc groove 641 (movement in the up-down direction, movement in the left-right direction) is restricted by the arc groove 641 (the guide plate 64 that defines the arc groove 641). Therefore, rattling between the tilt plate 71 and the angular plate 61 caused by an increase in the tilt angle of the cutting machine body 30 can be suppressed. Therefore, the cutting machine body 30 can be tilted more smoothly relative to the base 20.

[0054] The guide plate 64 is provided as a separate body from the angular plate 61. In this embodiment, the guide plate 64 is made of steel, and the angular plate 61 is made of aluminum, synthetic resin, or the like. This allows the circular saw 10 to be lightweight while ensuring wear resistance of the parts that slide during tilting operation.

[0055] Furthermore, since the arc groove 641 is disposed inside the through hole 65 that constitutes the angle fixing portion 9f, the space of the tilt support portion 6f can be effectively utilized.

[0056] In this embodiment, a circular saw 10, which is a type of portable cutting machine, is used as the cutting machine. In general, when tilting the cutting machine body 30 in a portable cutting machine, the user is more likely to apply force to the cutting machine body 30 than in a table saw or other stationary cutting machine. In such a portable cutting machine, the above-mentioned rattle is more likely to occur during the tilting operation. However, in the circular saw 10 of this embodiment, the rattle during the tilting operation is suppressed by providing the tilt support parts 6f and 6r described above, so that the user can smoothly tilt the cutting machine body 30.

[0057] <Second embodiment> A circular saw 10A according to a second embodiment will be described with reference to Fig. 10 to Fig. 14. The circular saw 10A according to the second embodiment differs from the first embodiment in the configuration. In the following description, the same reference numerals are used for the same configuration as the above-mentioned embodiment, and the description will be omitted.

[0058] The front tilt support part 6fA will be described as an example of the tilt support part of the circular saw 10A of this embodiment. As shown in Fig. 12, the rear surface 62A of the front tilt support part 6fA is not provided with the guide plate 64 of the first embodiment. Furthermore, the guide pin 73 is not fixed to the front surface 72A of the tilt plate 71A. In the circular saw 10A of this embodiment, the angle fixing shaft 92A and the through hole 65 of the angle fixing part 9fA are configured to function as the guide pin 73 and the arc groove 641 of the first embodiment.

[0059] As shown in FIG. 13, the angle fixing shaft 92A includes a shaft body 95A extending in the front-rear direction and a bearing 96A provided around the shaft body 95A. A rear end 93A (first portion) of the shaft 92A is fixed to the shaft fixing portion 711 of the tilting plate 71A. A front portion 94A (second portion) of the shaft 92A is disposed in the through hole 65. The bearing 96A is provided around the front portion 94A. A sliding bearing, a rolling bearing, or the like can be used as the bearing 96A. The portion of the shaft 92A where the bearing 96A is provided has an outer diameter sufficient to slide through the through hole 65 as a whole. The circular saw 10A includes a rear tilt support portion and an angle fixing portion that are formed symmetrically to the front tilt support portion 6fA and the angle fixing portion 9fA with respect to a virtual plane P perpendicular to the front-rear direction. The configurations of the rear tilt support portion and angle fixing portion of the circular saw 10A are similar to those of the front tilt support portion 6fA and angle fixing portion 9fA, respectively, except that they are symmetrical in the front-to-rear direction, so description and illustration will be omitted.

[0060] In this embodiment, as in the first embodiment, with the circular saw 10 in the right-angle position (tilt angle 0°), the user can release the fixed relationship between the front tilt plate 71A and the angular plate 61A by loosening the operation knob 91 of the angle fixing part 9fA. Also, the user can release the fixed relationship between the rear tilt plate 71A and the angular plate 61A by loosening the operation knob 91 of the rear angle fixing part (not shown). When the cutting machine body 30 is tilted to the right from the right-angle position by the user's operation, the front surface 72A of the tilt plate 71A slides against the rear surface 62A of the angular plate 61A and tilts to the right in conjunction with the cutting machine body 30 (see FIG. 14). At this time, the shaft 92A moves along the through hole 65 while the front portion 94A slides in the through hole 65. The up-down and left-right movement of the shaft 92A is regulated by the through hole 65. When the tilting plate 71A is tilted about the tilting axis C, the link arm 83 tilts around the axis D of the support shaft 81 in conjunction with the tilting of the tilting plate 71A. When the user tightens the operation knob 91 at a desired tilt angle, the tilting plate 71A and the angular plate 61A are tightened in the front-rear direction, and the tilt angle of the cutting machine body 30 relative to the base 20 is fixed.

[0061] In the circular saw 10A of the second embodiment described above, the arc-shaped through hole 65 for fixing the tilt angle and the angle fixing shaft 92A are used to support (guide) the tilt of the cutting machine body 30 about the tilt axis C, while suppressing wobble between the tilt plate 71A and the angular plate 61A caused by an increase in the tilt angle of the cutting machine body 30. Therefore, the configuration of the tilt support part 6fA can be simplified, and the cutting machine body 30 can be smoothly tilted relative to the base 20.

[0062] Furthermore, since the shaft 92A includes the bearing 96A, the shaft 92A can slide smoothly relative to the through hole 65. Therefore, wear of the through hole 65 can be suppressed.

[0063] <Correspondence> The correspondence between each component of the above embodiment and each component of the technology of the present disclosure is shown below. However, each component of the embodiment is merely an example and does not limit each component of the technology of the present disclosure. The circular saws 10 and 10A are examples of a "cutting machine" or a "portable cutting machine." The workpiece W is an example of a "workpiece." The contact surface 21 and the lower surface 21 are examples of the "contact surface". The base 20 is an example of a "base." The motor 33 is an example of a "motor." The tilt axis C is an example of a "first axis." The cutting machine body 30 is an example of a "cutting machine body." The front tilt support portions 6f, 6fA and the rear tilt support portion 6r are an example of "at least one tilt support portion." The tilting plates 71 and 71A are examples of the "tilting plate." The angular plates 61 and 61A are examples of the "angular plate". The front surface 72 and the rear surface 62 are each an example of an "opposing surface." Link arm 83 is an example of a "link arm." Axis D is an example of a "second axis." The front-rear direction is an example of a "direction parallel to the first axis". The upper side and the lower side are examples of the "second side" and the "first side", respectively. The arc groove 641 and the through hole 65 are an example of an "arc groove". The guide pin 73 and the shaft 92A are an example of a "guide pin." The rear portion 732 of the guide pin 73 and the front portion 94A of the shaft 92A are examples of the "first portion." The front portion 731 of the guide pin 73 and the rear end portion 93A of the shaft 92A are examples of the "second portion." The base end 84 and the tip end 85 of the link arm 83 are examples of the "base end" and the "tip end", respectively. The tilt direction T is an example of a "tilt direction." The angle fixing portions 9r and 9f are examples of the "angle fixing portion." The through hole 65 is an example of a "fixing groove." The shafts 92 and 92A are examples of "fixed angle shafts." The operation knob 91 is an example of an "operation section." The guide plate 64 is an example of a "guide plate." The first end 646 and the second end 647 of the arc groove 641 are examples of the "first end" and the "second end", respectively. The first pin 642 and the second pin 643 are examples of the "first pin" and the "second pin", respectively. The shaft body 95A is an example of a "shaft body." Bearing 96A is an example of a "bearing." The support shaft 81 is an example of a "support shaft." The link arm locking pin 75 is an example of a "tip shaft." The grip 36 is an example of a "handling portion."

[0064] <Other embodiments> In the first embodiment, the arc groove 641 does not have to be provided in the guide plate 64, and may be provided integrally with the angular plate 61, for example. When the angular plate 61 is made of aluminum or synthetic resin, a bearing may be provided around the shaft of the guide pin 73. According to this embodiment, the guide pin 73 can be smoothly slid along the arc groove 641, while the arc groove 641 provided in the angular plate 61 can be prevented from being worn down by the guide pin 73.

[0065] The materials of the angular plates 61, 61A, the tilting plates 71, 71A, the guide plate 64, and the like in the above-described embodiment may be changed arbitrarily.

[0066] In the first embodiment and the other embodiments described above, the arc groove 641 may be provided in the tilt plate 71, and the guide pin 73 may be provided in the angular plate 61. This embodiment also provides the same effects as the first embodiment described above.

[0067] The circular saw 10, 10A may be provided with a power cord that can be connected to an external AC power source, and may be powered by the external AC power source.

[0068] The above configuration is not limited to the circular saw 10, 10A, but can be applied to other cutting machines, such as non-plunge type circular saws, table saws, and flip-over saws.

[0069] In the above embodiment, the cutting machine may have one tilt support portion 6f (6fA), 6r. The cutting machine may have, for example, only the front tilt support portion 6f (6fA).

[0070] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention column can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0071] 6f, 6r, 6fA: tilt support part, 6f, 6fA: front tilt support part, 6r: rear tilt support part, 9f, 9fA: angle fixing part, 10, 10A: circular saw, 20: base, 21: lower surface, contact surface, 22: upper surface, 23: long ruler, 30: cutting machine body, 31: main body part, 32: motor housing, 33: motor, 34: gear housing, 35: cutting tool, 36: grip , 37: battery mounting portion, 39: biasing spring, 40: cover, 41: left side wall, 42: right side wall, 43: through hole, 45: mounting portion, 50: main body support portion, 51: base portion, 52: holding portion, 53: up and down swing shaft, 61, 61A: angular plate, 62, 62A: rear surface, 63: recess, 64: guide plate, 65: through hole, 66: corner portion, 67: outer edge, 71, 71A: tilt plate, 72, 72A: front surface, 73: guide pin, 75: link arm locking pin, 81: support shaft, 83: link arm, 84: base end portion, 85: tip portion, 91: operation knob, 92, 92A: shaft, 93, 93A: rear end portion, 94A: front portion, 95A: shaft main body, 96A: bearing, 200: battery, 611: angle memory , 612: hole, 613: hole, 641: arc groove, 642: first pin, 643: second pin, 646: first end, 647: second end, 651: end, 711: shaft fixing part, 731: front part, 732: rear part, 841: hole, 851: hole, AX1: rotation axis, AX2: axis, AX3: axis, C: tilt axis, D: axis, P: virtual plane, T: tilt direction, W: work

Claims

1. A cutting machine, a base having a contact surface for contacting the workpiece; a cutting machine body including an electric motor configured to provide a rotational driving force to a cutting tool, the cutting machine body being disposed on a second side relative to the abutment surface of the base; at least one tilt support portion that supports the cutting machine body so that the cutting machine body can tilt relative to the base around a first axis; The at least one tilt support portion is a tilting plate that protrudes toward the second side relative to the base and is fixed to the cutting machine body; an angular plate that protrudes from the base toward the second side, faces the tilting plate in a direction parallel to the first axis, and is fixed to the base; a link arm configured to connect the tilt plate and the angular plate; When the cutting machine body is tilted, The tilting plate tilts integrally with the cutting machine body, and the opposing surfaces of the tilting plate and the angular plate are in sliding contact with each other, The link arm tilts about a second axis parallel to the first axis in conjunction with tilting of the cutting machine body.

2. 2. The cutting machine according to claim 1, The second axis is provided on the second side of the contact surface of the base.

3. 2. The cutting machine according to claim 1, A cutting machine, wherein the first axis is an imaginary axis provided on a first side opposite to the second side with respect to the abutment surface of the base.

4. 2. The cutting machine according to claim 1, The at least one tilt support portion is an arc-shaped groove provided on one of the tilting plate and the angular plate and extending in the tilting direction of the cutting machine body; a guide pin having a first portion fixed to the other of the tilting plate and the angular plate, and a second portion protruding toward the arc groove, the guide pin sliding along the arc groove when the tilting plate is tilted.

5. 5. The cutting machine according to claim 4, the link arm has a base end portion provided on the second axis line and a tip end portion opposite the base end portion, The tip portion is fixed to the tilting plate on a side closer to the first axis than the arc groove and tilts integrally with the tilting plate.

6. 5. The cutting machine according to claim 4, an angle fixing unit capable of fixing an inclination angle of the cutting machine body relative to the base, an arc-shaped fixing groove provided in the angular plate and extending along the tilting direction of the cutting machine body; an angle fixing shaft extending parallel to the first axis and inserted into the fixing groove and engaged with the tilt plate; an angle fixing unit including an operation unit connected to the angle fixing shaft and capable of fixing the tilting plate and the angular plate in a direction parallel to the first axis by a user's operation; The arc groove is provided closer to the first axis than the fixing groove.

7. 7. The cutting machine according to claim 6, the arc groove is the fixing groove provided in the angular plate, The guide pin is the angle fixing shaft.

8. 5. The cutting machine according to claim 4, the at least one tilting support portion further includes a guide plate formed separately from the tilting plate and the angular plate, fixed to one of the tilting plate and the angular plate, and having the arc groove.

9. 9. The cutting machine according to claim 8, The cutting machine, wherein the guide plate is made of steel.

10. 9. The cutting machine according to claim 8, the at least one tilt support portion further includes a first pin disposed at a first end of the arcuate groove and a second pin disposed at a second end of the arcuate groove opposite to the first end, The first pin and the second pin secure the guide plate to the one of the tilt plate and the angular plate.

11. 5. The cutting machine according to claim 4, The guide pin has a shaft body and a bearing provided around the shaft body.

12. 6. The cutting machine according to claim 5, the at least one tilt support portion is a support shaft fixed to the angular plate and having a central axis along the second axis; a tip shaft fixed to the tilting plate, the base end of the link arm is provided on the support shaft and tilts on the support shaft; The tip of the link arm is provided on the tip shaft.

13. 2. The cutting machine according to claim 1, The cutting machine is a portable cutting machine having a grip portion that can be held by a user.

Images