Miter saw

Abstract

The present invention discloses a miter saw, comprising: a base; a workbench for placing a workpiece; a cutting system, wherein the cutting system is connected to the workbench via a support base and can rotate relative to the support base; and a locking assembly having a first state, a second state, and a third state. When the locking assembly is in the first state, the cutting system can be locked to fix the cutting system relative to the support base. When the locking assembly is in the second state, the cutting system rotates relative to the support base. When the locking assembly is in the third state, the cutting system can be positioned in cooperation with the support base for rotation. The present invention facilitates the operation of locking and positioning the cutting system's rotational motion, and multiple functions can be operated simultaneously, thereby improving user efficiency and user experience.

Description

Technical Field

[0001] The invention relates to an electric tool, in particular to a miter saw. Background Art

[0002] A miter saw is a bench-type tool capable of cutting at a specific angle. It typically includes a rotating cutting system and a rotatable worktable. This rotational movement requires some form of control. Prior art techniques, on the one hand, lack precise control over the rotational movement, which affects the accuracy of the miter saw's operation. On the other hand, existing control structures are complex and cumbersome, impacting the user experience and reducing work efficiency. Summary of the Invention

[0003] In order to solve the deficiencies of the prior art, the present invention aims to provide a multifunctional miter saw which is convenient and quick to operate, has high locking efficiency.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A miter saw comprises: a base; a workbench for placing a workpiece; a cutting system that rotates relative to the workbench to complete the cutting operation on the workpiece; a support seat that connects the cutting system and the workbench; and a locking assembly having a first state, a second state, and a third state; when the locking assembly is in the first state, the cutting system can be locked so that the cutting system is fixed relative to the support seat; when the locking assembly is in the second state, the cutting system rotates relative to the support seat; when the locking assembly is in the third state, it can cooperate with the support seat to position the rotation of the cutting system.

[0006] In some embodiments, the locking assembly includes a positioning pin that moves between a positioning position and a non-positioning position. When the locking assembly is in the third state, the positioning pin is located in the positioning position.

[0007] In some embodiments, the locking assembly also includes: a transmission wheel, including a protruding first transmission part; a biasing element, used to reset the positioning pin from a non-positioning position to a positioning position; the positioning pin includes a driven part corresponding to the shape of the first transmission part; the first transmission part acts on the driven part to make the positioning pin reach the non-positioning position.

[0008] In some embodiments, the locking assembly also includes: a first operating member, which moves between a first position, a second position and a third position under the action of an external force; when the first operating member is in the first position, the locking assembly is in the first state; when the first operating member is in the second position, the locking assembly is in the second state; when the first operating member is in the third position, the locking assembly is in the third state; and is connected to the transmission wheel, and when the first operating member is in the third position, the positioning pin is in the non-positioning position.

[0009] In some embodiments, the transmission wheel includes a protruding second transmission part, which is located differently from the first transmission part; the locking assembly also includes: a first locking part, which is arranged between the transmission wheel and the support seat. When the locking assembly is in the first state, the transmission wheel squeezes the first locking part toward the support seat.

[0010] In some embodiments, the support seat includes a locking plate and a second locking portion, the locking plate is arranged between the second locking portion and the first locking portion, and the locking portion is provided with a scale.

[0011] In some embodiments, a plurality of positioning blocks are provided on the support seat, and when the positioning pin is located at the positioning position, the positioning pin is limited by the positioning blocks.

[0012] In some embodiments, the cutting system includes: a cutting assembly, including a saw blade, which forms a cutting plane; a frame connected to the support base and supporting the cutting assembly; and a guide rail assembly connecting the frame and the cutting assembly, for realizing the movement of the cutting assembly within the cutting plane.

[0013] In some embodiments, a locking assembly is connected to the frame and is disposed in a space formed between the guide rail assembly and the support base.

[0014] A miter saw comprises: a base; a workbench for placing a workpiece; a cutting system that rotates relative to the workbench to complete the cutting operation on the workpiece; a support seat that connects the cutting system and the workbench; and a locking assembly having a first state, a second state, and a third state; when the locking assembly is in the first state, it can lock the cutting system so that the cutting system is stationary relative to the support seat; when the locking assembly is in the second state, the cutting system rotates relative to the support seat; when the locking assembly is in the third state, the cutting system rotates in one direction to a set position, and the locking assembly restricts the cutting system from continuing to move in that direction.

[0015] The present invention is beneficial in that it facilitates the operations of locking and positioning the rotational motion of the cutting system, and multiple functions can be operated simultaneously, thereby improving the user's efficiency and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the first embodiment of the present invention;

[0017] Figure 2 is a top view of the first embodiment of the present invention;

[0018] Figure 3 This is a partial structural diagram of a workbench and a locking assembly according to a first embodiment of the present invention;

[0019] Figure 4 yes Figure 3 A partial enlarged view of the structure B in the middle;

[0020] Figure 5 yes Figure 3 Side view of the structure;

[0021] Figure 6 When the first operating member is in the first position Figure 3 Cross-section of the structure in the RR plane;

[0022] Figure 7 When the first operating member is in the second position Figure 3 Cross-section of the structure in the RR plane;

[0023] Figure 8 When the first operating member is in the third position Figure 3 Cross-section of the structure in the RR plane;

[0024] Figure 9 This is a partial structural diagram of a frame and a locking assembly according to a first embodiment of the present invention;

[0025] Figure 10 This is a partial structural diagram of a locking assembly according to a first embodiment of the present invention;

[0026] Figure 11 yes Figure 1 A partial enlarged view of the structure A in the middle;

[0027] Figure 12 is a partial structural diagram of an extension assembly according to a first embodiment of the present invention;

[0028] Figure 13 This is a partial exploded structural diagram of an extension assembly according to a first embodiment of the present invention;

[0029] Figure 14 This is a schematic diagram of the use of an extension assembly according to an embodiment of the present invention;

[0030] Figure 15 This is a structural diagram of another perspective of the first embodiment of the present invention;

[0031] Figure 16 It is the existing technology Figure 15A partial enlarged view of the C structure;

[0032] Figure 17 In the first embodiment of the present invention Figure 15 A partial enlarged view of the C structure;

[0033] Figure 18 is a structural diagram of embodiment 2 of the present invention;

[0034] Figure 19 This is a structural diagram of a locking assembly according to a second embodiment of the present invention;

[0035] Figure 20 is a top view of the locking assembly of the second embodiment of the present invention;

[0036] Figure 21 Schematic diagram of the clutch structure of the second embodiment of the present invention;

[0037] Figure 22 This is a structural diagram of a workbench and an adjustment assembly according to a second embodiment of the present invention;

[0038] Figure 23 is a partial schematic diagram of a workbench and an adjustment assembly according to a second embodiment of the present invention;

[0039] Figure 24 yes Figure 22 Cross-section of the mid-QQ plane;

[0040] Figure 25 This is a partial structural diagram of the auxiliary table assembly of the second embodiment of the present invention;

[0041] Figure 26 It is a top view of the structure of part 2 of embodiment of the present invention;

[0042] Figure 27 yes Figure 26 Schematic diagram of the SS section;

[0043] Figure 28 It is a partial schematic diagram of the positioning component of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] In order to facilitate the description of the technical solution of the present invention, the following is also defined: Figure 1 The up, down, front, back, left and right shown by the arrows in the figure are as follows: Figure 1 Take the state of the miter saw 100 in FIG. 1 as an example.

[0046] like Figure 1The miter saw 100 shown includes a base 130 , a work table 120 , a cutting system 110 , an extension assembly 150 , and a locking assembly 140 .

[0047] The base 130 is used to support the workbench 120, that is, to support the entire miter saw 100. The miter saw 100 can be stably placed on the ground or an operating plane through the base 120. Specifically, the base 130 is located below the workbench 120, and the cutting system 110 is located above the workbench 120.

[0048] The cutting system 110 includes a cutting assembly 111, a frame 113, and a guide rail assembly 112. The cutting assembly 111 includes a cutting member 111b and a motor. The cutting member 111b is used to perform the cutting function of the miter saw 100 and is specifically a circular saw blade. The motor provides a power source, driving the cutting member to rotate within a cutting plane 102, thereby enabling the cutting member to cut a workpiece placed on a worktable 120. Furthermore, the cutting assembly 111 includes a connecting member 111c connecting the cutting assembly 111 and the guide rail assembly 112. The cutting assembly 111 is pivotally connected to the connecting member 111, meaning that the cutting assembly 111 can rotate about a first axis 101. Furthermore, the cutting assembly 111 includes a shield 111a that at least partially covers the cutting member 111b. It will be appreciated that the shield 111a can also be fixedly connected to the connecting member 13. To ensure safety, the shield 111a includes a first fixed shield and a second shield that rotates relative to the connecting member 111c. The first guard always surrounds at least a portion of the cutting element 111b. When not cutting, the second guard surrounds at least a portion of the cutting element 111b and prevents the circular saw blade 11 from being directly exposed to the user. When the user rotates the cutting head 10 about the second axis 102 and gradually approaches the workpiece for cutting, the second guard can be gradually rotated away from the workbench or away from the cutting element 111b, allowing the cutting element 111b to contact the workpiece for cutting. Travel wheels are also provided at the lower end of the guard 111a where it contacts the workbench 120, assisting in the forward and backward movement of the cutting system on the workbench 120.

[0049] Guide rail assembly 112 is positioned above frame 113. Frame 113 defines a through-hole for guide rail assembly 112 to pass through. The through-hole has a predetermined depth, allowing guide rail assembly 112 to move forward and backward within the through-hole. Guide rail assembly 112 includes a slide rail, which passes through the through-hole. One end of the slide rail is provided with a stopper to prevent guide rail assembly 112 from disengaging from the through-hole, and the other end is fixedly connected to connector 111c. Specifically, the guide rail assembly is also connected to a reset member, which can be a spring, to reset the slide rail.

[0050] The workbench 120 also has a first passage 121 extending through it. The first passage 121 extends within the cutting plane 102. The first end of the first passage 121 is located within the workbench 120, and the second end extends to the exterior of the workbench 120, which is the front end of the cutting assembly 111. The first passage 121 allows the cutting member 111b to pass through when severing the workpiece and at least partially accommodate itself within a first accommodating cavity 122 formed in the center of the first passage 121. The workbench 120 and the second end of the first passage 121 provide support for the running wheels of the shield 111a, which move on both sides of the first accommodating cavity 122. Positioning slots 125 are provided on the first passage 121 near the edge of the first accommodating cavity 122. Specifically, the positioning groove 125 is arranged at the second end of the first channel 121, that is, at the part of the first channel 121 extending out of the workbench 120. The shape of the positioning groove 125 is consistent with the shape of the walking wheel, so that the walking wheel on the shield 111a just enters the positioning groove 125 when it moves to this position. At this time, the cutting member 111b is located in the middle of the first channel 121, and the second operating member 114 is operated at the same time to lock the guide rail assembly 112.

[0051] A support base 123 is provided on the side of the workbench 120 opposite the first channel 121. Specifically, this support base 123 is located at the rear end of the cutting assembly 111. Specifically, the support base 123 is connected to the frame 113, and the frame 113 is capable of supporting and driving the cutting system to rotate relative to the base 130 about the second axis 103. Furthermore, the second axis 103 lies within the cutting plane 102. The workbench 120, the first channel 121, and the support base 113 are all symmetrical about the second axis 103, and the first channel 121 also extends along this second axis 103.

[0052] The frame 113 comprises, in sequence, a pivot portion 113a, an extension portion 113b, and a connecting portion 113c. The pivot portion 113a is pivotally connected to the support base 123 and transmits the rotation of the frame 113. The extension portion 113b extends upward relative to the workbench 120, connecting the pivot portion 113a and the connecting portion 113c. The connecting portion 113c is formed with a through hole 112a. Furthermore, the width of the connecting portion 113c in the front-to-back direction is greater than the width of the extension portion 113b, so that the front end of the connecting portion 113c and the front end of the support base are approximately located in the same vertical plane in the front-to-back direction. In other words, the connecting portion 113c, the extension portion 113b, and the support base 123 can enclose a storage space, within which the majority of the locking assembly 140 is located. Below the connecting portion 113c, a bracket 113d is formed. The bracket 113d is located within this storage space and houses the majority of the locking assembly 140.

[0053] The locking assembly 140 has a first state, a second state, and a third state. When the locking assembly 140 is in the first state, it can lock the cutting system so that the cutting system is stationary relative to the support base 123. When the locking assembly 140 is in the second state, the cutting system rotates relative to the support base 123. When the locking assembly 140 is in the third state, it can cooperate with the support base 123 to position the rotation of the cutting system. In other words, when the locking assembly 140 is in the third state, the cutting system can stop rotating in one direction at a set position, and specifically, can continue to move in the other direction. The point where the movement stops is the positioning point, or the cutting system can move within a certain range, in which case there are two close positioning points.

[0054] The locking assembly 140 includes a first operating member 141, a positioning pin 142, and a transmission wheel 143. The first operating member 141 is connected to the transmission wheel 143, and the transmission wheel 143 is connected to the positioning pin 142. The first operating member 141 is connected to the transmission wheel 143 via a first rotating shaft 145. The first operating member 141 and the transmission wheel 143 both rotate around the third axis 104 at the center of the first rotating shaft. The first operating member 141 is used to transmit the power required for rotation to the transmission wheel 143 via the first rotating shaft 145. The first operating member 141 moves between the first position, the second position, and the third position under the action of an external force, such as Figure 6 、 7 , 8. It should be noted that the first position, second position, or third position described above are not necessarily limited to the positions shown in the figures. The positions shown in the figures are the limit or critical positions for achieving the state of the locking assembly 140 in this embodiment. As long as the locking assembly 140 can achieve the functions described in the above states, it can be considered that it has reached the corresponding position. The position may also be a position between the first position, second position, or third position shown in the figures.

[0055] When the first operating member 141 is located at the first position, the locking assembly 140 is in the first state, such as Figure 6As shown. The transmission wheel 143 is a special-shaped cam structure, including a protruding first transmission part 143a and a second transmission part 143b. The first transmission part 143a and the second transmission part 143b are located at different positions on the transmission wheel 143, that is, the first transmission part 143a and the second transmission part 143b protrude in different directions. A first locking part 115 is provided on the rear side of the transmission wheel 143, that is, a first locking part 115 is provided between the locking assembly 140 and the frame 113. The first locking part 115 is a friction plate with a certain friction coefficient. Furthermore, a locking plate 114 is provided between the support seat 123 and the frame 113. The locking plate 114 has a scale for assisting in the positioning of the cutting system. When the first operating member 141 moves to the first position, the first operating member 141 rotates along the first direction 106, driving the transmission wheel 143 to move along the first direction 106. As the first operating member 141 moves toward a position approaching the first position, the second transmission portion 143b gradually compresses the first locking portion 115, causing the first locking portion 115 to gradually abut against the locking plate 114. This further forces the locking plate 114 to abut against the internal structure of the frame 113, locking the frame 113 and the locking plate 114. When the cutting system reaches a stationary position relative to the support base 123, the first operating member 141 is in the first position, i.e., the locking assembly 140 is in the first state. Furthermore, a second locking portion 116 is provided between the frame 113 and the locking plate 114. The second locking portion 116 is also a friction plate with a certain friction coefficient. The presence of these locking portions on both sides of the locking plate 114 further enhances the locking stability of the locking assembly 140 in the first state.

[0056] When the first operating member 141 is located at the second position, the locking assembly 140 is in the second state. Figure 7 As shown. Positioning pins 142 are arranged at intervals below the transmission wheel 143, and the positioning pins 142 move between the positioning position and the non-positioning position. The upper end of the positioning pin 142 includes a driven portion 142b corresponding to the shape and position of the first transmission portion 143a, and a protruding positioning portion is provided at the lower end of the positioning pin 142. A second rotating shaft 146 passes through the middle of the positioning pin 142, and the positioning pin can rotate around the fourth axis 105 of the center of the second rotating shaft. The first operating member 141 rotates along the second direction 107, driving the transmission wheel 143 to rotate along the second direction 107, and the first transmission portion 143a interferes with the driven portion 142b. Under the interference of the first transmission portion 143a, the positioning pin 142 rotates along the first direction 106 around the fourth axis 105. When the first operating member 141 moves to the second position, the positioning pin 142 moves from the positioning position to the non-positioning position.

[0057] When the first operating member 141 is located at the third position, the locking assembly 140 is in the third state. Figure 8As shown. The third position is between the first position and the second position in the front-to-back direction. When the first operating member 141 is in the third position, the first transmission part 143a does not interfere with the driven part 142b, and the second transmission part 143b does not squeeze the first locking part 115 and the locking plate 114, so that while the positioning part 142a is in the positioning position, the cutting system can also rotate relative to the support seat 123, which is the third state. Furthermore, when the locking assembly 140 is in the third state, the lower edge of the first transmission part 143a and the upper edge of the driven part 142b have a certain gap or just touch, and the situation of just touching is that the two surfaces are tangent but the first transmission part 143a does not generate a rotational force on the positioning pin 142. Similarly, when the locking assembly 140 is in the third state, there is a certain gap between one side surface of the second transmission part 143b and the inner wall of the frame 113 or they are just in contact. The situation of just contacting is that the two surfaces are tangent but the second transmission part 143b does not generate an extruding force on the first locking part 115 behind the frame 113.

[0058] The support base 123 is also provided with a plurality of positioning blocks 124 that cooperate with the positioning pins 142. In this embodiment, the positioning blocks protrude outward relative to the surface of the support base 123. Since the cutting system needs to rotate, the upper surface of the support base 123 is configured as an arc shape. Positioning blocks 124 are provided at different positions on the surface to ensure that when the frame 113 rotates to different positions, the positioning pins 142 can be limited by the positioning blocks 124 at different positions. Furthermore, in this embodiment, the left side wall of the positioning block 124 contacts the positioning pin 142. The straight line connecting the left side wall of the positioning pin 142 (or the left side wall of the positioning block 124) to the center of the support base forms an angle α with the plane where the workbench is located. This angle is the installation angle of the positioning block 124. α is also the rotation positioning angle of the cutting system. The values of α include but are not limited to commonly used cutting angles such as 30°, 45°, 60°, 90°, 120°, 135°, and 150°. In other embodiments, the positioning block 124 is configured as a detachable or rotatable structure to adjust the positioning angle according to user needs.

[0059] like Figure 9As shown, both ends of the first rotating shaft 145 are fixed on the bracket 113d, wherein one end portion extends out of the bracket 113d, and the extended portion is fixedly connected to the first operating member 141 to transmit the movement of the first operating member 141. The above-mentioned extended portion includes a first fixed portion 145a and a second fixed portion 145b. The first operating member 141 includes an operating portion 141a and a fixing hole 141b. The second fixed portion 145b is connected to the fixing hole 141b correspondingly, and the first fixed portion 145a passes through the fixing hole 141a and is connected to the fixing member 147, so that the first operating member 141 and the first rotating shaft 145 are stably connected. Furthermore, the outer diameter of the fixing member 141b is larger than the diameter of the fixing hole 141a. Furthermore, the cross-section of the fixing hole 141b and the second fixed portion 145b is waist-shaped or flat.

[0060] The locking assembly 140 also includes a biasing element 144, which is used to reset the locating pin 142 from the non-locating position to the locating position. Specifically, the biasing element 144 is a metal spring, and the biasing element 144 has a first end and a second end. The first end is fixedly connected to the frame 113 across the transmission wheel 143, and the second end is fixed to the upper end of the locating pin 142 by a fastener 148. Furthermore, the locating pin 142 includes a rotating portion 142d and a connecting terminal 142c. The rotating portion 142 is sleeved outside the second rotating shaft 146 so that the locating pin 142 can rotate relative to the bracket 113. The connecting terminal 142c is connected to the rotating portion 142, and is located at different positions on the axial direction of the rotating portion 142d with the driven portion 142b, which is more conducive to the setting of the position of the transmission portion and the driven portion of the transmission wheel 143, thereby ensuring the compactness of the locking assembly. Furthermore, the connecting terminal 142c and the driven portion 142b also extend in different directions in the radial direction of the rotating portion 142d. In this embodiment, at least two connecting terminals 142c are provided, and the above-mentioned connecting terminals 142c are respectively located on both sides of the driven portion 142b in the direction of the third axis to ensure the stability of the reset. Furthermore, the two connecting terminals 142c are respectively connected to the second ends of the two biasing elements 144. Furthermore, the first ends of the two biasing elements 144 are in an integral shape. When the positioning pin 142 is rotated upward to the non-positioning position under the action of the transmission wheel 143, the connecting terminal 142c drives the extrusion or torsion biasing element 144. When the interference force of the transmission wheel 143 disappears, the positioning pin 142 returns to the positioning position under the action of the biasing element 144.

[0061] The cutting system also includes a guide assembly 160 for guiding the workpiece. The guide assembly 160 is disposed on the shield 111a and spaced apart from the cutting element 111b. In other embodiments, the guide assembly 160 can be disposed near a fence or workbench. The guide assembly 160 includes a pivotally connected guide movable member 161 and a guide fixed member 162. Specifically, the guide fixed member 162 is fixedly connected to the shield 111a. The guide fixed member 162 includes a pivot hole 162a, and the guide movable member 161 includes a pivot portion 161a. The pivot portion 161a and the pivot hole 162a are pivotally connected by a third rotating shaft 163, allowing the guide movable member 161 to rotate about the third rotating shaft relative to the guide fixed member 162, with the guide movable member 161 having a first position and a second position, with the first position shown in the figure. The guide assembly 160 also includes an elastic member 164, one end of which is connected to the guide movable member 164 to provide a force to reset the guide movable member 164. When the elastic member 164 is in a natural state, the guide movable member 161 is located in a first position. Furthermore, in this embodiment, the first position is configured to be tilted downward relative to the horizontal plane or parallel to the horizontal plane. The second position is the position after the guide movable member 161 squeezes the elastic member 164 and rotates upward. The specific height of the second position is determined by the height of the workpiece. During the use of the miter saw 100 of this embodiment, for workpieces with higher heights, the stability of the placement operation is poor. By providing a guide assembly, when the workpiece moves along the cutting member 111b, the upper surface of the workpiece contacts the guide movable member 161. Under the thrust of the operator, the guide assembly rotates upward, and the squeezed elastic member 164 causes the guide movable member 161 to always have a downward pressing force, thereby ensuring the stability of the workpiece.

[0062] Furthermore, the movable guide member 161 includes a flat surface, an L-shaped table, or a stepped surface, including but not limited to the aforementioned structures, connected to the pivot portion 161a, so that the movable guide member 161 has at least one flat surface or one edge that contacts the workpiece. The fixed guide member 162 is fixed to the first shield. The fixed guide member 162 also has a height adjustment device that can adjust its position according to the height of the workpiece.

[0063] like Figure 1As shown, an extension assembly 150 is provided on the outside of the workbench 120. Specifically, the extension assembly 150 is roughly symmetrically arranged about the cutting plane 102. The extension assembly 150 includes an auxiliary support member 152, a first slide rail 151, and an extension platform 155. The auxiliary support member 152 is connected to the first slide rail 151 and moves along the slide rail. The first slide rail 151 is formed by a continuous transverse slide rail 151a and a longitudinal slide rail 151b. Specifically, the transverse slide rail 151a and the longitudinal slide rail 151b extend in different directions and connect at a point to form an L-shape. To ensure smooth sliding of the auxiliary support member 152, the connection is curved. The auxiliary support member 152 has at least a first support surface and a second support surface, which can provide support for workpieces that exceed the size of the workbench. Specifically, when the auxiliary support member 152 moves onto the longitudinal slide rail 151b, its first support surface is flush with the surface of the transverse slide rail 151a, and the auxiliary support member 152 acts as an extension of the slide rail surface to provide support. When the auxiliary support member 152 moves onto the transverse slide rail 151a, its first support surface cooperates with the fence to provide support for the workpiece in an inclined posture, such as Figure 14 As shown. Furthermore, the auxiliary support member 152 also includes a second support surface different from the first support surface, which is used to limit the position of the workpiece to be cut, so that the workpiece can be cut into a fixed length (approximately one-half the diameter of the workbench). When the auxiliary support member 152 is located on the left side of the workbench 120, the second support surface is the right end surface of the auxiliary support member 152. The workpiece enters the workbench 120 from the right side. When the end of the workpiece reaches the second support surface of the auxiliary support member 152, the cutting system is operated to complete the cutting, and the workpiece can be cut to a given length. Based on this, the auxiliary support member 152 can also be removed from the first slide rail 151 and installed in the front side of the fence 126 as the third state of the extension component. The above-mentioned limit positioning function is performed in front of the fence 126, further shortening the set cutting length of the workpiece. In other embodiments, the auxiliary support member 152 can also rotate, rotating the second support surface of the auxiliary support member 152 to the side against the workpiece. The curvature, slope or surface shape of the second support surface is different from the first support surface, so that the support member has different support methods for the workpiece.

[0064] The auxiliary support member 152 includes a sliding rod 157 connected to the first slide rail 151, a support seat 154a, and a first handle 154b. The sliding rod 157 includes a sliding end 157b and a fixed end 157a. The diameter of the sliding end 157b is larger than that of the fixed end 157a. The sliding end 157b is embedded in the first slide rail 151, and the fixed end 157a is connected to the support seat 154a. The main body of the sliding rod 157 is cylindrical to ensure the rotation of the auxiliary support member 152 on the first slide rail 151. The support seat 154a constitutes the main part of the auxiliary support member 154 and has a first support surface and a second support surface. The support seat 154a is fixedly connected to the fixed end 157a. The support seat 154a is provided with a first handle 154b on the side opposite to the above-mentioned connection for controlling the movement of the auxiliary support member 152.

[0065] The combined structure of the auxiliary support member 152 and the first slide rail 151 is placed on an extension platform 155. The extension platform 155 is connected to the base 130 via a telescoping mechanism 156, allowing the overall width of the extension platform 155 to be adjusted to accommodate the workpiece. The extension platform 155 also includes a second slide rail 158, which is equipped with a second handle 153. One end of the second handle 153 extends through the second slide rail 158 and connects to the first slide rail 151. By manipulating the second handle 153, the entire first slide rail 151 can slide on a plane of the extension platform 155, further extending the support range.

[0066] In the prior art miter saw, the cutting piece is connected to a transmission device, which transmits power to the motor through the transmission device, and the transmission device is partially concentric with the cutting piece. The transmission device includes an unlocking device for contacting the connection between the cutting piece and the cutting system or the transmission device, and then the user replaces the cutting piece. In the prior art, the button of the unlocking device usually includes an unlocking button 170 and an elastic body 171 provided on the transmission device housing 172. Generally, the elastic body 171 only provides the restoring force of the unlocking button 170, that is, when the operator presses it, the internal unlocking device will be in the unlocked state. In order to simplify the configuration of the mechanism and not affect the layout of the transmission device, there is generally no pressing card or structure inside, and the user needs to keep pressing for a long time to cooperate with the unlocking.

[0067] To address the aforementioned issues, in this embodiment, a special-shaped groove 175 is formed on the key housing 173. An unlocking pin 174 is disposed within the key housing 173, and a protruding latch 174a is provided on the unlocking pin 174. The special-shaped groove 175 comprises at least two sections oriented in different directions. The latch 174a can move along the special-shaped groove 175. When the latch 174a moves from the end of the special-shaped groove 175 along the first section to the intersection of the first and second sections, the unlocking device switches from locked to unlocked. After the latch 174a enters the second section, it engages with the second section, maintaining the unlocking device in the unlocked state. At this point, the operator can use both hands to disassemble and assemble the cutting element.

[0068] Example 2

[0069] like Figures 18 to 24 As shown, this embodiment discloses a miter saw, wherein components identical or corresponding to those in the first embodiment are designated by corresponding reference numerals or names. For simplicity, only the differences between the first embodiment and the second embodiment will be described. The miter saw 200 of this embodiment differs from the first embodiment in the structure and location of the locking assembly 210.

[0070] The main body of the locking assembly 210 is disposed along the first channel 241, with the third operating member 221 and the fourth operating member 231 of the locking assembly 210 exposed at the second end 242 of the first channel 241. The locking assembly 210 comprises a locking structure 220 and a positioning structure 230, which respectively connect the third operating member 221 and the fourth operating member 231.

[0071] like Figure 19As shown, the locking structure 220 includes a transmission rod 222 connected to a third operating member 221. A user's manipulation of the third operating member 221 causes the transmission rod 222 to rotate about the first straight line 201. The transmission rod 222 has a first end connected to the third operating member 221, and a second end disposed within the support base and connected to the locking member. The locking member includes a first fixing member 224, a locking plate 226, a first elastic member 225, and a second fixing member 227. The second end of the transmission rod 222, i.e., the end distal from the third operating member 221, has a threaded section that sequentially passes through and connects to the first fixing member 224, the locking plate 226, the first elastic member 225, and the second fixing member 227. Specifically, the first fixing member 224 and the locking piece 226 are fixedly connected to the housing of the support base, the second fixing member 227 is fixedly connected to the second end of the transmission rod 222, the first elastic member 225 is disposed between the second fixing member 225 and the locking piece 226, and a portion of the housing of the support base is disposed between the first fixing member 224 and the locking piece 226. When the transmission rod 222 rotates about the first straight line 201 in the first direction 202, the threaded segment causes the transmission rod 222 to move forward of the miter saw 200 along the first straight line 201, and the second fixing member 227 compresses the first elastic member 225 and, in turn, the locking piece 225 and the housing of the support base against the first fixing member 224, causing the locking assembly to lock the rotation of the bracket and the cutting system to reach the first state. When the transmission rod 222 rotates around the first straight line 201 in a direction opposite to the first direction 202, the transmission rod 222 moves along the first straight line 201 toward the rear of the miter saw 200. Under the action of the restoring force of the first elastic member 225, the transmission rod 222 drives the second fixing member 2227 away from the locking plate 226 more quickly, completing the unlocking of the rotational movement of the cutting system. At this time, the cutting system can enter the second state or the third state.

[0072] The locking structure 220 further includes a clutch structure 223 provided on the positioning rod 222 for limiting the movement of the transmission rod 222 toward the rear of the bevel saw 200 along the first straight line 201, that is, limiting further movement during the unlocking process. Figure 21As shown, the clutch structure 223 includes a first clutch member 223a and a second clutch member 223b. The first clutch member 223a and the second clutch member 223b each have a surface that meshes with each other. Specifically, the first clutch member 223a is fixed to the housing below the workbench 240, and the second clutch member 223b is fixedly connected to the transmission rod 222. Both the first clutch member 223a and the second clutch member 223b have a through hole for the transmission rod 222 to pass through. Furthermore, the surface of the first clutch member 223a facing the second clutch member 223b is provided with a stepped step 223c. The step 223c gradually increases in height along the first direction 202, and when reaching a certain height, a cross-section 223d is formed. The surface of the second clutch member 223b facing the first clutch member 233a also has a shape that meshes with the first clutch member 233a. These two surfaces have at least two steps 223c structures. The second clutch member 223b has a center-defined shaped hole 223e. This shaped hole 223e is a through hole, unlike a circular hole. The transmission rod 222 has a corresponding protrusion that engages with the shaped hole 223e, thereby securing the second clutch member 223b to the transmission rod 222. Specifically, when the first clutch member 223a and the second clutch member 223b are engaged, the clutch structure restricts the transmission rod 222 from rotating in a direction opposite to the first direction 202 due to the restriction of the two cross-sections 223d.

[0073] The locking structure 220 also includes a connecting member 229 positioned in front of the second clutch member 223b. A second elastic member 228 is disposed between the connecting member 229 and the second clutch member 223b. The second elastic member 228 is connected to the connecting member 229 and the second clutch member 223b at both ends. The connecting member 229 is sleeved on the transmission rod 222 and movably connected thereto, allowing the transmission rod 222 to move between the connecting member 229. The connecting member 229 is also fixedly connected to the housing of the worktable 240. When the transmission rod 222 rotates in the first direction 202 about the first straight line 201, the transmission rod 222 moves along the first straight line 201 toward the front of the miter saw 200. Simultaneously, the locking structure is locked, and the second clutch member 223b, driven by the transmission rod 22, moves along the step 223c until it is separated from the first clutch member 223a by the second elastic member 228. When the transmission rod 222 rotates about the first line 201 in a direction opposite to the first direction 202, the transmission rod 222 moves along the first line 201 toward the rear of the bevel saw 200. Driven by the transmission rod 22, the second clutch member 223b approaches the first clutch member 223a. When the two surfaces engage and press against the second elastic member 228, the cross-sections 223d of the two surfaces engage, preventing the second clutch member 223b from moving further, thereby restricting further movement of the transmission rod 222. At this point, the critical state after unlocking is reached, ensuring that the cutting system can complete its movement after unlocking. A damping member is also provided on the rear side of the support base to provide cushioning for the rotating frame.

[0074] The positioning structure 230 includes a transmission member 234 connected to the fourth operating member 231. In this embodiment, the transmission member 234 is a flexible transmission structure; in other embodiments, it can also be a rigid structure. The transmission member 234 is connected to the fourth operating member 231 via a connecting rod 232 and a cam 233. The connecting rod 232 and cam 233 are used to change the transmission mode and direction of the fourth operating member 231, allowing the fourth operating member 231 and the third operating member 221 to be positioned on the same side of the first channel 241. Due to the first accommodation space in the center of the first channel 241, the first channel 241 housing is divided into two left and right sections. The main bodies of the positioning structure 230 and the locking structure 220 can be respectively positioned in these two sections. The fourth operating member 231 and the third operating member 221 are positioned on the sides of the first channel 241, and the connecting rod 232 is positioned transversely at the end of the first channel 241. The main body of the transmission member 234 extends along the first channel, that is, in a direction parallel to the first straight line 201. Specifically, one end of the connecting rod 232 is connected to the fourth operating member 231, and the other end is connected to the cam 233. Driven by the fourth operating member 231, the cam 233 can rotate around the central axis of the connecting rod 232, i.e., the second straight line 203. The movement direction of the transmission member 234 is parallel to the plane in which the cam 233 rotates. In this embodiment, the transmission member 234 moves in the opposite direction parallel to the first straight line 201. A positioning pin 235 is connected to the end of the transmission member 234. The positioning pin 235 is at least partially connected to the support base housing so that the positioning pin 235 can only move in a direction parallel to the first straight line 201. A positioning block 236 is provided at the positioning pin 235. The positioning block 236 is disposed in the frame and is provided with a plurality of positioning holes 236a. The position of each positioning hole 236a corresponds to the rotation of the frame to a different angle. When the locking assembly 210 is in the second state, the cutting system can rotate relative to the support base. At this time, when the cam 233 moves forward, it drives the transmission member 234 to move forward, and then drives the positioning pin 235 to move forward, and the positioning pin 235 is separated from the positioning hole 236a. When the locking structure is in the unlocked state, the cutting system can rotate relative to the support base. When the locking assembly 210 is in the third state, the cutting system is temporarily stationary relative to the support base. Regardless of whether the locking structure is in the unlocked state or the locked state, the cutting system remains stationary. At this time, when the cam 233 moves backward, it drives the transmission member 234 to move backward, and then drives the positioning pin 235 to move backward. The positioning pin 235 enters one of the positioning holes 236a on the positioning block 236. Since the positioning pin 235 is at least partially connected to the support base, the cutting system can be fixed to a predetermined position by the positioning pin. At this time, the cutting system can be locked by simply operating the third operating member 221 to lock the cutting system.

[0075] In this embodiment, the shape of the positioning hole 236a is consistent with the shape of the end of the positioning pin 235, so that when the locking assembly is in the third state, the positioned cutting system is substantially similar to the first state. In other embodiments, the positioning hole 236a may be a specially shaped elongated hole, such as an arc-shaped hole, with each end of the hole corresponding to a specific cutting angle, allowing the positioning pin 235 to rotate within a certain set range. This allows the cutting system to rotate within a certain set range. When rotated to the two ends, the two set angles are respectively corresponding. The operator can quickly determine the desired angle range without having to check the scale on the rear of the miter saw 200. In combination with the operating member located on the front side of the miter saw 200, the operator can quickly determine the desired angle range.

[0076] In addition to the cutting system of the miter saw 200 being able to rotate relative to the support base, its worktable 240 is also able to rotate relative to the base 250, although this structure is not limited to this embodiment. To facilitate the rotation of the worktable 240, this embodiment also includes an adjustment assembly 260. The adjustment assembly 260 is located below the worktable 240 and is used by the operator to rotate the worktable 240 and adjust and position the worktable 240 on the base 250. The adjustment assembly 260 has a locked position and an unlocked position, corresponding to the locked and unlocked states of the worktable 240 relative to the base 250, respectively. The adjustment assembly 260 is connected to a fifth operating member 261 located at the second end of the first channel 241. The fifth operating member 261 is in the form of a handle. By operating the fifth operating member 261, the user activates the unlocked movement of the worktable 240 and drives the movement of the adjustment assembly 260 between the locked and unlocked positions.

[0077] Specifically, the fifth operating member 261 is connected to the workbench 240 housing via a pivot rod 262, allowing the pivot rod 262 to rotate about a point. A first moving member 263 is connected to the pivot rod 262 and is capable of moving in the same direction driven by the pivot rod 262. The first end of the first moving member 263 is positioned at the fifth operating member 261, and the second end abuts the second moving member 264. When the first moving member 263 rotates, the second moving member 264 is driven by the first moving member 263 to move in the opposite direction of the first moving member 263. Specifically, when the second end of the first moving member 263 rotates downward relative to its original position, the end of the second moving member 264, away from the first moving member 263, rotates upward. Specifically, the first end of the second moving member 264 abuts below the first moving member 263, and the second end of the second moving member 264 is connected to an adjusting member 266. The adjusting member 266 is a resilient structure located below the second moving member 264, and is at least partially connected to the underside of the second moving member 264. The first end of the adjusting member 266 is connected to the shell of the workbench 240 through the fixing member 265, so that the connection of the fixing member 265 can be used as a reference point for elastic deformation movement. The second end of the adjusting member 266 is located above the adjusting portion 252 of the base 250, and the adjusting portion 252 is provided with a scale required for adjusting the workbench to rotate in the horizontal direction. Furthermore, the second end of the adjusting member 266 is provided with a positioning portion 266a, and a plurality of positioning grooves 251 are provided on the adjusting portion 252, and the plurality of positioning grooves 251 correspond to different rotation angles of the workbench 240 and the cutting system. Specifically, the positioning portion 266a protrudes downward, and the shape of the protrusion is consistent with the shape of the positioning groove 251. The first moving member 263 also includes an elastic portion 263a mounted on the pivot rod 262, and the upper end of the elastic portion 263a is near the second end of the first channel 240. When the adjustment mechanism is in the locked position, a certain distance exists between the upper end of the elastic portion 263a and the second end of the first channel 240. When the fifth operating member 261 moves upward, the upper end of the elastic portion 263a gradually approaches the second end of the first channel 240. When the adjustment mechanism is in the locked position, the upper end of the elastic portion 263a and the second end of the first channel 240 contact and squeeze each other, causing a certain deformation of the elastic portion 263a. When the user operates the fifth operating member 261 upward, the second end of the first moving member 263 moves downward, and the second end of the second moving member 264 moves upward accordingly, causing the second end of the adjustment member 266 to deform upward, causing the positioning portion 266a to exit the positioning slot 252, and the adjustment assembly 260 to exit the base 250. At this point, the workbench 240 enters the unlocked state, allowing it to rotate relative to the base 250. Otherwise, the adjustment assembly 260 enters the locked position. In other embodiments, a single moving member may be provided to perform the aforementioned transmission. In other embodiments, the positioning portion may be provided on the adjustment member, while the positioning slot may be provided at the end of the adjustment member.

[0078] In this embodiment, a sub-table assembly 270 is further provided on one side of the miter saw 200. The sub-table assembly 270 is similar to the extension assembly in the first embodiment and can play a supporting function of assisting and extending the workbench. The sub-table assembly 270 of this embodiment also has the function of storing workpieces and waste materials. The sub-table assembly 270 includes a support member 272, a sixth operating member 271, an extension seat 273 and a telescopic device. The telescopic device is provided below the support member 272 and is connected to the base 250 so that the sub-table assembly 270 can move away from or closer to the workbench 240. The extension seat 273 is provided above the guide rail of the telescopic device. When the sub-table assembly 270 is in the original position, one end of the extension seat 273 is low against the base 250, and the other end is connected to the bottom of the support member 272. The upper surface of the support member 272 and the upper surface of the workbench are located in the same plane. The worktable 240, extension seat 273, and support member 272 form a concave structure, creating a gap between the worktable 240 and extension seat 273. This gap allows for the placement of workpieces, and the upper surface of support member 272 also serves as a placement surface for any excess workpieces extending beyond the worktable. The sixth operating member 271 locks the moved auxiliary table assembly 270 onto the guide rails of the telescopic mechanism to a specific position.

[0079] like Figures 26-28 As shown, the miter saw 200 includes a worktable positioning assembly 280. At least a portion of the positioning assembly 280 is fixedly connected to the worktable 240. At least a portion of the positioning assembly 280 is disposed below the worktable 240. In particular, a portion of the positioning assembly 280 is disposed along the first channel 241. The positioning assembly 280 is used to lock the worktable 240 after rotation and, together with the adjustment assembly 270, completes positioning of the worktable's rotation angle. The positioning assembly 280 includes a sixth operating member 281 for user operation. When the user operates the sixth operating member 281 to move to a first position, the positioning assembly 280 completes locking of the worktable 240. When the user operates the sixth operating member 281 to move to a second position, the positioning assembly 280 completes unlocking. The aforementioned locked state means that the worktable 240 is fixed to the base 250 via the positioning assembly 280. At this time, the worktable 240 and the base 250 cannot complete relative movement. The unlocked state mentioned above means that the workbench 240 and the base 250 are not fixedly connected, and the workbench 240 can move relative to the base 250 under the action of the user.

[0080] The positioning assembly 280 includes a brake block 282, which is transmission-connected to the sixth operating member 281. The brake block 282 moves with the movement of the sixth operating member 281. When the worktable 240 and base 250 are locked, one surface of the brake block 282 comes into close contact with a surface of the base 250, and friction locks the worktable 240 and base 250 together. Specifically, the base 250 forms a receiving groove 253 below the worktable 240. The receiving groove 253 has a surface that contacts the brake block 282, designated as a first braking surface, and a corresponding contact surface of the brake block 282, designated as a second braking surface. The receiving groove 253 is located inboard of the circumference of the mediating portion 252, with the surface that contacts the brake block 282 located on the side of the receiving groove 253 away from the mediating portion 252. The first braking surface or the second braking surface forms an angle β with the plane of the worktable 240, preferably 15°≤β≤70°.

[0081] The brake block 282 is connected to the sixth operating member 281 via a transmission assembly 283. The transmission assembly 283 includes a second transmission member 283b and a first transmission member 283a. One end of the second transmission member 283b is connected to the sixth operating member 281, and the other end is connected to the first transmission member 283a. The first transmission member 283a extends along the third straight line 204 and is movable in the direction of the third straight line 204. Furthermore, the first transmission member 283 can be a rigid rod-shaped structure or other structure or assembly capable of movement. The first transmission member 283 is disposed between the workbench 240 and the base 250, with one end connected to the second transmission member 283b and the other end connected to the brake block 282. When the first transmission member 283a moves in the direction of the third straight line 204, the brake block 282 follows the first transmission member 283a and moves in a direction parallel to or overlapping with the third straight line 204. In particular, the upper surfaces of the workbench 240 and the base 250 are parallel or substantially parallel to the third straight line 204, such that the main body of the workbench 240, the first transmission member 283a, and the upper surface of the base 250 are parallel to each other, or the angle between any two of the aforementioned three elements does not exceed 10°. When the sixth operating member 281 moves between the first position and the second position and its motion path is not parallel to or coincides with the third straight line 204, the second transmission member 283b is used to convert the direction of the force applied by the sixth operating member 281 on the second transmission member 283b into a direction along the third straight line 204. If the sixth operating member 281 moves between the first position and the second position and its motion path is parallel to or coincides with the third straight line 204, the transmission assembly 283 may also not include the second transmission member 283b.

[0082] The first transmission member 283a is connected to a fixed structure at the bottom of the workbench 240. The fixed structure restricts the radial movement of the first transmission member 283a, causing it to move substantially in the axial direction, i.e., along the third straight line 204. A biasing element 284 is also provided between the fixed structures to provide a restoring force to the movement of the first transmission member 283a.

[0083] Positioning assembly 280 includes a pointer 285, which moves along the scale of adjustment portion 252 with the workbench 240. Specifically, pointer 285 is provided on the end of first transmission member 283a near the brake block. Pointer 285 moves along with positioning assembly 280, which in turn rotates with workbench 240. The distal end of pointer 285 is located near adjustment portion 252, indicating the scale of adjustment portion 252. Because positioning assembly 285 is mounted inside the housing of workbench 240, pointer 285 is exposed within workbench 240.

[0084] In other cases, the adjustment assembly 260 and the positioning assembly 280 are connected via a transmission structure, and operating one of the sixth operating member 281 or the fifth operating member 261 can achieve rotation and positioning of the workbench 240 relative to the base 250. The transmission structure connects the sixth operating member 281 or the fifth operating member 261 together under certain circumstances and separates them under certain circumstances.

[0085] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of the present invention.

Claims

1. A miter saw comprising: base; A workbench for placing workpieces; a cutting system, rotating relative to the workbench, for completing a cutting operation on the workpiece; A support base, connecting the cutting system and the workbench; It is characterized by further comprising: The locking assembly has a first state, a second state, and a third state; when the locking assembly is in the first state, the cutting system can be locked to fix the cutting system relative to the support base; when the locking assembly is in the second state, the cutting system rotates relative to the support base; when the locking assembly is in the third state, it can cooperate with the support base to position the rotation of the cutting system; The miter saw further includes a positioning pin capable of moving between a positioning position and a non-positioning position, and a plurality of positioning blocks capable of cooperating with the positioning pin. When the locking assembly is in the third state, the positioning pin is in the positioning position and is limited by the positioning blocks.

2. The miter saw according to claim 1, wherein: The locking assembly further comprises: A transmission wheel including a protruding first transmission portion; a biasing element for resetting the positioning pin from the non-positioning position to the positioning position; The positioning pin includes a driven portion having a shape corresponding to that of the first transmission portion; the first transmission portion acts on the driven portion to enable the positioning pin to reach a non-positioning position.

3. The miter saw according to claim 2, wherein: The locking assembly further comprises: The first operating member moves between the first position, the second position and the third position under the action of an external force; when the first operating member is in the first position, the locking assembly is in the first state; when the first operating member is in the second position, the locking assembly is in the second state; when the first operating member is in the third position, the locking assembly is in the third state; it is connected to the transmission wheel in transmission, and when the first operating member is in the third position, the positioning pin is in the non-positioning position.

4. The miter saw according to claim 2, wherein: The transmission wheel includes a protruding second transmission portion, which is located at a different position from the first transmission portion; The locking assembly further includes: a first locking portion, which is provided between the transmission wheel and the support seat. When the locking assembly is in the first state, the transmission wheel presses the first locking portion toward the support seat.

5. The miter saw according to claim 4, characterized in that The support seat includes a locking plate and a second locking portion, the locking plate is arranged between the second locking portion and the first locking portion, and the locking plate is provided with a scale.

6. The miter saw according to claim 1, wherein: A plurality of positioning blocks are provided on the support seat.

7. The miter saw according to claim 1, wherein: The cutting system comprises: a cutting assembly including a saw blade, wherein the saw blade forms a cutting plane; a frame connected to the support base and supporting the cutting assembly; A guide rail assembly connects the frame and the cutting assembly and is used to enable the cutting assembly to move within the cutting plane.

8. The miter saw according to claim 7, wherein: The locking assembly is connected to the frame and is arranged in a space formed between the guide rail assembly and the support seat.

9. A miter saw comprising: base; A workbench for placing workpieces; a cutting system, rotating relative to the workbench, for completing a cutting operation on the workpiece; A support base, connecting the cutting system and the workbench; It is characterized by further comprising: The locking assembly has a first state, a second state, and a third state; when the locking assembly is in the first state, the cutting system can be locked so that the cutting system is stationary relative to the support base; when the locking assembly is in the second state, the cutting system rotates relative to the support base; when the locking assembly is in the third state, the cutting system rotates in one direction to a set position, and the locking assembly restricts the cutting system from continuing to move in the direction; The miter saw further includes a positioning pin capable of moving between a positioning position and a non-positioning position, and a plurality of positioning blocks capable of cooperating with the positioning pin. When the locking assembly is in the third state, the positioning pin is in the positioning position and is limited by the positioning blocks.

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