Saw

Abstract

The utility model discloses a saw, and particularly relates to an electric circular saw. The saw comprises a saw blade, a driving shaft, a protective cover, a bottom plate and a light-emitting device. The saw blade can rotate to cut a workpiece, and the saw blade extends in a cutting plane. The driving shaft is used for driving the saw blade to rotate around a first straight line perpendicular to the cutting plane. And the protective cover is used for shielding chippings generated during cutting of the saw blade. The bottom plate is used for abutting against a workpiece, a bottom plate plane making contact with the workpiece is formed on the bottom plate, and a first opening allowing the saw blade to penetrate through to make contact with the workpiece is further formed in the bottom plate. The light-emitting device is installed on the protective cover and comprises a light-emitting element capable of generating light rays irradiated to the saw blade. Wherein the distance between the central axis of the light-emitting element and the cutting plane is 0-5 cm, and when light rays generated by the light-emitting element irradiate the saw blade, the projection, generated on the plane of the bottom plate, of the saw blade is overlapped with the cutting plane.

Description

Technical Field

[0001] The present application relates to a saw, in particular to an electric circular saw. Background Art

[0002] When sawing power tools such as electric circular saws, miter saws and table saws are used for cutting, they often need to make straight-line cuts on the workpiece to be processed. The conventional straight-line cutting method is to draw a preset cutting line on the surface of the workpiece to be processed, and the user uses experience to hold the electric circular saw so that the saw blade is aligned with the preset cutting line and then makes a straight-line cut. This cutting method is difficult to ensure accurate cutting results, and the saw blade often deviates from the preset cutting line during the actual cutting process. Utility Model Content

[0003] In order to solve the deficiencies of the prior art, the purpose of the present application is to provide a saw that can improve the cutting accuracy.

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

[0005] The first aspect of the present application provides a saw, comprising: a saw blade, which can rotate to cut a workpiece, and the saw blade is arranged to extend in a cutting plane; a drive shaft, which is used to drive the saw blade to rotate around a first straight line, and the first straight line is perpendicular to the cutting plane; a shield, which is used to shield the debris generated by the saw blade during cutting; a bottom plate, which is used to abut against the workpiece, and the bottom plate is formed with a bottom plate plane that contacts the workpiece, and the bottom plate is also formed with a first opening for allowing the saw blade to pass through to contact the workpiece; a light-emitting device, which is mounted on the shield, and the light-emitting device includes a light-emitting element that can generate light to irradiate the saw blade; when the light generated by the light-emitting element irradiates the saw blade, the projection generated by the saw blade on the bottom plate plane overlaps with the cutting plane. Wherein, the central axis of the light-emitting element differs from the cutting plane by 0 to 5 cm.

[0006] In some embodiments, the central axis of the light emitting element is located within the cutting plane.

[0007] In some embodiments, the shield includes a fixed shield and a movable shield, the movable shield can rotate around the first straight line as an axis, and the light emitting device is mounted to the fixed shield.

[0008] In some embodiments, the movable shield includes a light-transmitting slot, and the light-transmitting slot is configured so that when at least a portion of the movable shield rotates to between the fixed shield and the saw blade, light generated by the light-emitting element can pass through the light-transmitting slot and illuminate the saw blade.

[0009] In some embodiments, the fixed shield includes a mounting portion for mounting the light emitting device, and the mounting portion includes: a receiving space for receiving the light emitting element; a second opening disposed below the light emitting element, and the light generated by the light emitting element in the receiving space can pass through the second opening to irradiate the saw blade.

[0010] In some embodiments, the light-emitting device also includes: a lamp holder for mounting a light-emitting element; a light-transmitting member for covering the second opening, wherein the light-transmitting member can prevent debris generated by the saw blade during cutting from entering the accommodating space, and the light generated by the light-emitting element in the accommodating space can pass through the light-transmitting member to illuminate the saw blade.

[0011] In some embodiments, the light emitting device further includes a positioning component capable of moving the light emitting element in a second straight line direction, where the second straight line intersects with the central axis of the light emitting element.

[0012] In some embodiments, the second straight line is perpendicular to the central axis of the light emitting element.

[0013] In some embodiments, the positioning assembly includes: a first positioning member pressing against a first end of the lamp holder, at least a portion of the first positioning member is located outside the accommodation space; a second positioning member pressing against a second end of the lamp holder, at least a portion of the second positioning member is disposed within the accommodation space, wherein the first end and the second end are disposed at opposite ends of the lamp holder, respectively.

[0014] In some embodiments, the second adjustment member is an elastic member, and the elastic member is disposed in the accommodating space.

[0015] In some embodiments, a portion of the light-transmitting member is exposed from the accommodating space, and the light-transmitting member can rotate around the third straight line.

[0016] In some embodiments, the light emitting device further comprises a cleaning member capable of contacting the light transmissive member, and the cleaning member can clean a portion in contact with the light transmissive member when the light transmissive member rotates.

[0017] In some embodiments, a portion of the light-transmitting member is exposed from the accommodating space, and the light-transmitting member can be pulled out of the mounting portion by a user.

[0018] In some embodiments, the mounting portion is configured to be separable from at least a portion of the fixed shield to allow a user to clean the light-transmitting member.

[0019] In some embodiments, the light-emitting device further includes: a cleaning member in contact with the light-transmitting member, which can clean the portion in contact with the light-transmitting member when the light-transmitting member rotates; and an operating member that carries the cleaning member, which can be operated by a user to drive the cleaning member to clean the light-transmitting member.

[0020] In some embodiments, the operating member includes: a rotating shaft; a bearing portion for bearing the cleaning member, one end of the bearing portion being fixedly connected to the rotating shaft; and an operating portion at least partially extending out of the accommodation space to allow being moved by a user, one end of the operating portion being fixedly connected to the rotating shaft. The bearing portion and the operating portion are respectively arranged on both sides of the rotating shaft.

[0021] In some embodiments, the saw also includes: a motor for driving the drive shaft to rotate; a coupling portion capable of forming an electrical connection with a battery pack that provides power to the motor; a circuit board capable of at least controlling the start and stop of the motor; a first wire electrically connecting the coupling portion and the circuit board; a second wire electrically connecting the circuit board and the light-emitting element; wherein the fixed shield includes: a mounting portion including a accommodating space for accommodating the light-emitting element; a wire groove for accommodating the second wire, the wire groove being connected to the accommodating space.

[0022] In some embodiments, the distance between the projection of the first straight line on the bottom plate plane and the edge of the saw blade is L1; when the light generated by the light-emitting element is irradiated to the saw blade, the projection of the saw blade on the bottom plate plane includes at least one edge line, and the maximum distance between the edge line and the projection of the first straight line in the bottom plate plane is L2; ​​wherein L2 is greater than or equal to L1.

[0023] In some embodiments, the distance between the projection of the first straight line on the bottom plate plane and the edge of the saw blade is L1; the bottom plate includes a first opening for allowing the saw blade to pass through the first opening to contact the workpiece, and the maximum distance between the edge of the first opening and the projection of the first straight line in the bottom plate plane is L3; wherein L3 is greater than or equal to L1.

[0024] In some embodiments, the luminous flux output by the light emitting element is greater than or equal to 5 lumens.

[0025] In some embodiments, in the cutting plane, the line connecting the projection of the light-emitting element and the projection of the first straight line constitutes a fourth straight line; the projection of the bottom plate plane in the cutting plane is a fifth straight line; wherein the angle between the fourth straight line and the fifth straight line is α, 3°≤α≤177°.

[0026] In some embodiments, 25°≤α≤70°.

[0027] According to a second aspect of the present application, there is provided a saw, comprising: a saw blade, which can rotate to cut a workpiece, and the saw blade is arranged to extend in a cutting plane; a drive shaft, which is used to drive the saw blade to rotate around a first straight line, and the first straight line is perpendicular to the cutting plane; a shield, which is used to shield the debris generated by the saw blade during cutting; a base plate, which is used to abut against the workpiece, and the base plate forms a base plane in contact with the workpiece; a light-emitting device, which is mounted on the shield, and the light-emitting device comprises a light-emitting element capable of generating light to illuminate the saw blade, and when the light generated by the light-emitting element illuminates the saw blade, the projection of the saw blade on the base plane can be located in the cutting plane; in the cutting plane, the line connecting the projection of the light-emitting element and the projection of the first straight line constitutes a fourth straight line; the projection of the base plane in the cutting plane is a fifth straight line; wherein the angle between the fourth straight line and the fifth straight line is α, 3°≤α≤177°.

[0028] In some embodiments, 25°≤α≤70°.

[0029] According to a third aspect of the present application, there is provided a saw, comprising: a saw blade, which can rotate to cut a workpiece, and the saw blade is arranged to extend within a cutting plane; a drive shaft, which is used to drive the saw blade to rotate around a first straight line, and the first straight line is perpendicular to the cutting plane; a fixed shield, which is used to shield part of the debris generated by the saw blade during cutting; a base plate, which is used to abut against the workpiece, and the base plate forms a base plane in contact with the workpiece; a light-emitting device, which is installed in the accommodating space of the mounting portion of the fixed shield, and the light-emitting device includes a light-emitting element and a lamp holder, and the light-emitting element can generate light to irradiate the saw blade, and the lamp holder is used to install the light-emitting element, and when the light generated by the light-emitting element is irradiated to the saw blade, the projection of the saw blade on the base plane can be located within the cutting plane; the fixed shield includes a mounting portion for installing the light-emitting device, and a positioning assembly is also provided in the mounting portion, which can move the light-emitting element on a second straight line, and the second straight line intersects with the central axis of the light-emitting element.

[0030] In some embodiments, the second straight line is perpendicular to the central axis of the light emitting element.

[0031] In some embodiments, the positioning assembly includes: a first positioning member, which presses against the first end of the lamp holder, and at least a portion of the first positioning member is located outside the accommodating space; a second positioning member, which presses against the second end of the lamp holder, and at least a portion of the second positioning member is arranged in the accommodating space; wherein the first end and the second end are respectively arranged at opposite ends of the lamp holder.

[0032] In some embodiments, the second adjustment member is an elastic member, and the elastic member is disposed in the accommodating space.

[0033] The fourth aspect of the present application provides a saw, comprising: a saw blade, which can rotate to cut a workpiece, and the saw blade is arranged to extend in a cutting plane; a drive shaft, which is used to drive the saw blade to rotate around a first straight line, and the first straight line is perpendicular to the cutting plane; a fixed shield, which is used to shield part of the debris generated by the saw blade during cutting; a bottom plate, which is used to abut against the workpiece, and the bottom plate is formed with a bottom plate plane in contact with the workpiece; a light-emitting device, which is installed in the accommodation space of the mounting portion of the fixed shield, and the light-emitting device includes a light-emitting element that can generate light to irradiate the saw blade, and when the light generated by the light-emitting element is irradiated to the saw blade, the projection of the saw blade on the bottom plate plane can be located in the cutting plane. The light-emitting device also includes: a lamp holder, which is used to install the light-emitting element; a light-transmitting member, which can block the debris generated by the saw blade during cutting from entering the accommodation space, and the light generated by the light-emitting element in the accommodation space can pass through the light-transmitting member and irradiate the saw blade; wherein a portion of the light-transmitting member is exposed in the accommodation space to allow the user to turn it to rotate around the third straight line.

[0034] In some embodiments, the light emitting device further comprises a cleaning member capable of contacting the light transmissive member, and the cleaning member can clean a portion in contact with the light transmissive member when the light transmissive member rotates.

[0035] The benefit of the present application lies in that by providing a light-emitting device, the projection of the saw blade on the base plane becomes a straight line where the cutting plane intersects the base plane. When the user needs to cut in a straight line, it is only necessary to overlap the projection straight line of the saw blade with the preset cutting line on the workpiece surface to ensure the accuracy of the saw blade cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a three-dimensional diagram of a saw and a workpiece with a battery pack installed provided in one embodiment of the present application;

[0037] Figure 2 is a perspective view of a saw and a battery pack provided in one embodiment of the present application;

[0038] Figure 3 is a plan view of a saw with a portion of a housing, a guard, and a saw blade removed provided by an embodiment of the present application;

[0039] Figure 4 is a three-dimensional diagram of a fixed shield and a light-emitting device provided in one embodiment of the present application;

[0040] Figure 5 is a three-dimensional diagram of a fixed shield and a light-emitting device after a portion of the housing is removed provided by an embodiment of the present application;

[0041] Figure 6 yes Figure 5 A magnified image of area A;

[0042] Figure 7 yes Figure 5 A plan view of the fixed shield and light emitting device shown;

[0043] Figure 8 yes Figure 7 Enlarged view of area B;

[0044] Fig. 9 is a three-dimensional diagram of a movable shield provided in one embodiment of the present application;

[0045] Fig.10 is a schematic plan view of the installation positions of the light emitting device, the saw blade and the bottom plate provided in one embodiment of the present application;

[0046] Fig.11 is a schematic plan view of the installation position of the light emitting device and the installation part provided in one embodiment of the present application;

[0047] Fig.12 It is a schematic plan view of the projection of the light emitting device, the fixed shield, the saw blade and the bottom plate on the cutting plane provided by one embodiment of the present application;

[0048] Fig.13is a three-dimensional diagram of a fixed shield and a light-emitting device after a portion of the housing is removed provided by an embodiment of the present application;

[0049] Fig.14 yes Fig.13 Enlarged view of the middle C area;

[0050] Fig.15 is a plan view of a fixed shield and a light emitting device provided in one embodiment of the present application;

[0051] Fig.16 yes Fig.15 A perspective view of the fixed shield and the light emitting device shown;

[0052] Fig.17 is a three-dimensional diagram of a fixed shield and a light-emitting device after a portion of the housing is removed provided by an embodiment of the present application;

[0053] Fig.18 yes Fig.17 A perspective view of the light emitting device shown;

[0054] Fig.19 yes Fig.18 A schematic plan view of the installation position of the light emitting device and the installation portion is shown. DETAILED DESCRIPTION

[0055] The present application is described in detail below in conjunction with the accompanying drawings and specific embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures or steps related to the present application are shown in the accompanying drawings, rather than all structures or steps.

[0056] The saw 1 shown in the drawings is specifically an electric circular saw. Of course, those skilled in the art will appreciate that the saw may also be other saw-type electric tools such as a miter saw, a table saw, etc. that can achieve straight-line cutting.

[0057] like Figures 1 to 3 As shown, the saw 1 includes: a housing 11 , a driving shaft 12 , a motor 13 , a saw blade 14 , a shield 15 , a base plate 16 , a light emitting device 17 , a circuit board 18 and a wire 19 .

[0058] The housing 11 is formed with a handle portion 111, a receiving portion 112 and a coupling portion 113. The handle portion 111 is used for the user to hold, the receiving portion 112 is used to form a receiving cavity 1120 capable of accommodating components such as the circuit board 18 and the wire 19, and the coupling portion 113 is used to achieve electrical connection with the battery pack 2. The battery pack 2 can provide power for the saw 1. In other embodiments, the saw 1 can also be connected to an alternating current.

[0059] The drive shaft 12 is used to drive the saw blade 14 to rotate with the first straight line 101 as the rotation axis. Specifically, the drive shaft 12 is driven to rotate by the motor 13. In some embodiments, the drive shaft 12 can be directly formed by the motor shaft of the motor 13, or a transmission assembly (not shown in the drawings) is further provided between the motor 13 and the drive shaft 12, and torque transmission between the motor 13 and the drive shaft 12 is achieved through the transmission assembly. Specifically, the motor 13 can be a brushless motor.

[0060] In this embodiment, the saw blade 14 is a generally circular saw blade, and the saw blade 14 can be driven by the drive shaft 12 to rotate around the first straight line 101 to achieve cutting. The saw blade 14 extends in a cutting plane 140. It can be understood that in this embodiment, the thickness of the saw blade 14 in the direction of the first straight line 101 can be ignored. In this way, the plane where the saw blade 14 itself is located is the cutting plane 140. The first straight line 101 passes through the center of the saw blade 14, and the cutting plane 140 is perpendicular to the first straight line 101. Taking straight line cutting as an example, when the saw 1 performs a cutting operation, the actual cutting line formed by cutting the workpiece 3 is located in the cutting plane 140. In other embodiments, when the thickness of the saw blade 14 needs to be considered, the plane where the center line of the saw blade 14 in the thickness direction is located is the cutting plane 140.

[0061] The shield 15 is used to prevent the debris generated by the saw blade 14 when cutting the workpiece 3 from splashing to the user's side. The shield 15 at least partially surrounds the saw blade 14 in the circumferential direction of the first straight line 101 around which the saw blade 14 rotates. Specifically, the shield 15 includes a fixed shield 151 and a movable shield 152. The fixed shield 151 is fixedly arranged on the upper side of the drive shaft 12 relative to the housing 11. The movable shield 152 and the fixed shield 151 are connected in rotation with the first straight line 101 as the axis. When the movable shield 152 rotates relative to the fixed shield 151, it can rotate to a position to release the saw blade 14 for cutting operations. The movable shield 152 can also rotate to a position to isolate the saw blade 14.

[0062] The bottom plate 16 is formed with a bottom plate plane 160 for contacting the workpiece 3. When the user needs to cut the workpiece 3, the bottom plate 16 abuts against the workpiece 3. The bottom plate 16 is also formed with a first opening 161 for at least part of the saw blade 14 to pass through, so that the saw blade 14 can extend to the lower side of the bottom plate plane 160 to cut the workpiece 3. It can be understood that in this embodiment, the thickness of the bottom plate 16 can be ignored, so that the plane where the bottom plate 16 itself is located is the bottom plate plane 160. In other embodiments, when the thickness of the bottom plate 16 needs to be considered, the plane where the bottom of the bottom plate 16 contacts the workpiece 3 is the bottom plate plane 160.

[0063] like Figures 3 to 8As shown, the light emitting device 17 is mounted to the shield 15, specifically, the light emitting device 17 is mounted in the mounting portion 1511 of the fixed shield 151. The light emitting device 17 includes a light emitting element 171 disposed above the saw blade 14 and capable of generating light to illuminate the saw blade 14. The light emitting element 171 is accommodated in the accommodation space 1510 of the mounting portion 1511. The mounting portion 1511 is provided with a second opening 1512 below the light emitting element 171 (see Fig.11 ). When the light generated by the light-emitting element 171 passes through the second opening 1512 and irradiates the saw blade 14, the projection of the saw blade 14 in the bottom plane 160 can be a straight line 141, and the straight line 141 is located in the cutting plane 140. Therefore, when the user needs to operate the saw 1 to cut the workpiece 3, the accuracy of the straight line cutting of the saw 1 can be ensured as long as the projection straight line 141 located on the saw blade 14 partially overlaps with the preset cutting line 31 on the surface of the workpiece 3. In some embodiments, the light-emitting device 17 also includes a lamp holder 172 and a light-transmitting member 173. The lamp holder 172 is used to install the light-emitting element 171, and the light-emitting element 171 is fixedly installed on the lamp holder 172. The light-transmitting member 173 is used to cover the second opening 1512 to prevent the debris generated by the saw blade 14 during cutting from entering the accommodating space 1510 and contaminating the light-emitting element 171. The light-transmitting member 173 is made of transparent or translucent material, and the light generated by the light-emitting element 171 in the accommodation space 1510 can pass through the light-transmitting member 173 and illuminate the saw blade 14. In other embodiments, the fixed shield 151 may not be provided with the second opening 1512, and the position of the second opening 1512 may be partially or entirely made of transparent or translucent material.

[0064] The circuit board 18 can at least control the start and stop of the motor 13. In some embodiments, the circuit board 18 can also control the switch of the light emitting element 171. The wire 19 is used to realize the electrical connection between the components in the saw 1, such as the electrical connection between the circuit board 18 and the motor 13. Figure 3 As shown, in some embodiments, the wire 19 includes at least a first wire 191 and a second wire 192. The first wire 191 connects the joint 133 and the circuit board 18, so that the joint 133 and the circuit board 18 are electrically connected. The second wire 192 connects the light-emitting element 171 and the circuit board 18, so that the light-emitting element 171 and the circuit board 18 are electrically connected. In some embodiments, the fixed shield 151 is further provided with a wire groove 1513, at least for accommodating the second wire 192. Specifically, the wire groove 1513 can be provided on the side of the fixed shield 151 facing the handle portion 111.

[0065] like Fig. 9As shown, in some embodiments, in order to prevent the movable shield 152 from blocking the light generated by the light-emitting element 171 when the movable shield 152 rotates to above the saw blade 14, the movable shield 152 further includes a light-transmitting groove 1521. When at least part of the movable shield 152 rotates to between the fixed shield 151 and the saw blade 14, the light generated by the light-emitting element 171 can pass through the light-transmitting groove 1521 and irradiate the saw blade 14. In other embodiments, the movable shield 152 may also be partially or entirely made of transparent or translucent material, so that the light-transmitting groove 1521 is not required.

[0066] like Fig.10 As shown, in some embodiments, in order to make the projection of the saw blade 14 in the bottom plane 160 clear and not generate double images, the central axis 1711 of the light emitting element 171 is 0 to 5 cm away from the cutting plane 140, preferably, 0 to 1 cm away. In some embodiments, the light emitting element 171 is symmetrically arranged with respect to the cutting plane 140, that is, when the central axis 1711 of the light emitting element 171 is located in the cutting plane 140, the projection of the saw blade 14 in the bottom plane 160 is the clearest.

[0067] like Figure 10 to Figure 11 As shown, in some embodiments, in order to solve the problem that the central axis 1711 of the light-emitting element 171 is offset due to vibration during assembly, transportation or working, resulting in unclear projection of the saw blade 14 in the bottom plane 160, ghosting, etc., the light-emitting device 17 also includes a position adjustment component 174, which can move the light-emitting element 171 in the direction of the second straight line 102, and the second straight line 102 intersects with the central axis 1711 of the light-emitting element 171. In one embodiment, the second straight line 102 is perpendicular to the central axis 1711 of the light-emitting element 171. In one embodiment, the second straight line 102 is perpendicular to the cutting plane 140. Therefore, in this embodiment, the position adjustment component 174 can adjust the position of the light-emitting element 171, and then adjust the relative position of the central axis 1711 of the light-emitting element 171 and the cutting plane 140.

[0068] like Fig.11As shown, the position adjustment component 174 includes a first position adjustment member 1741 and a second position adjustment member 1742. One end of the first position adjustment member 1741 presses against the first end 1721 of the lamp holder 172, and at least a portion of the other end of the first position adjustment member 1741 is located outside the accommodation space 1510 to allow user operation. At least a portion of the second position adjustment member 1742 is disposed in the accommodation space 1510, and one end of the second position adjustment member 1742 presses against the inner wall of the mounting portion 1511, and the other end presses against the second end 1722 of the lamp holder 172. The first end 1721 and the second end 1722 are respectively disposed at opposite ends of the lamp holder 172. In some embodiments, the second position adjustment member 1742 may be an elastic member, such as a spring, and the first position adjustment member 1741 may be threadedly connected to a portion of the outer wall of the mounting portion 1511. Thus, when the user rotates the end of the first adjusting member 1741 exposed outside the mounting portion 1511, the length of the first adjusting member 1741 extending into the accommodation space 1510 can be adjusted, thereby moving the lamp holder 172 in the direction of the second straight line 102, thereby driving the light emitting element 171 to move in the direction of the second straight line 102. In other embodiments, the first adjusting member 1741 and the second adjusting member 1742 can both be studs threadedly connected to a portion of the outer wall of the mounting portion 1511, and one end of the first adjusting member 1741 and the second adjusting member 1742 are accommodated in the accommodation space 1510, and the other end extends out of the accommodation space 1510 to allow the user to adjust.

[0069] In some embodiments, in order to make the projection of the saw blade 14 in the bottom plane 160 clear and bright, the luminous flux output by the light emitting element 171 is greater than or equal to 5 lumens. In this embodiment, the light intensity of the light emitting element 171 is appropriate, neither too bright nor too dim, and is suitable for most cutting scenes.

[0070] like Fig.12 As shown, in some embodiments, the distance between the projection of the first straight line 101 on the bottom plane 160 and the edge (i.e., the saw tip) of the saw blade 14 is L1. When the light generated by the light-emitting element 171 irradiates the saw blade 14, the projection straight line 141 generated by the saw blade 14 on the bottom plane 160 includes an edge line 1411 at its edge position, and the maximum distance between the edge line 1411 and the projection of the first straight line 101 on the bottom plane 160 is L2, where L2≥L1. In some embodiments, the maximum distance between the edge of the first opening 161 and the projection of the first straight line 101 on the bottom plane 160 is L3, where L3≥L1.

[0071] In some embodiments, in the cutting plane 140, the projection of the first straight line 101 is a point, which is also the center of the circular projection of the saw blade 14. In the cutting plane 140, the line connecting the projection of the light emitting element 171 and the projection of the first straight line 101 constitutes a fourth straight line 104, and the projection of the bottom plane 160 in the cutting plane 140 is a fifth straight line 105, wherein the angle between the fourth straight line 104 and the fifth straight line 105 is α, 3°≤α≤177°. In some embodiments, 25°≤α≤70°.

[0072] The debris generated by the saw 1 when cutting the workpiece 3 will splash onto the surface of the light-transmitting member 173 , and part of the debris will be stained on the surface of the light-transmitting member 173 . When too much debris is accumulated, the brightness and clarity of the projection of the saw blade 14 will be affected.

[0073] like Fig.11 As shown, in some embodiments, in order to facilitate the user to clean the debris on the surface of the light-transmitting member 173, a portion of the light-transmitting member 173 is exposed in the accommodation space 1510, and the light-transmitting member 173 can rotate around the third straight line 103. Therefore, the user can continuously rotate the light-transmitting member 173 by moving the portion of the light-transmitting member 173 exposed in the accommodation space 1510, and clean the portion of the light-transmitting member 173 exposed in the accommodation space 1510.

[0074] In one embodiment, when the light-transmitting member 173 rotates, the outer wall of the mounting portion 1511 in contact with the light-transmitting member 173 can scrape off larger debris adhering to the surface of the light-transmitting member 173 .

[0075] like Fig.11 As shown, in one embodiment, in order to clean the fine debris adhering to the surface of the light-transmitting member 173, the light-emitting device 17 further includes a cleaning member 175 for cleaning the surface of the light-transmitting member 173. The cleaning member 175 may be rubber or felt. At least a portion of the cleaning member 175 is disposed in the accommodation space 1510 and contacts a portion of the cleaning member 175. When the user turns the light-transmitting member 173 to rotate, the outer wall of the mounting portion 1511 disposed at the edge of the second opening 1512 can scrape off the larger debris adhering to the surface of the light-transmitting member 173, and the fine debris enters the accommodation space 1510 along with the light-transmitting member 173. When the debris rotates to contact the cleaning member 175, the debris is adhered to the cleaning member 175, thereby cleaning the surface of the light-transmitting member 173.

[0076] like Figure 13 to Figure 14As shown, the present application also provides an embodiment that is convenient for users to clean debris. In this embodiment, the user can remove the light-transmitting member 473 from the mounting portion 4511 and clean the surface of the light-transmitting member 473. In other embodiments, the light-transmitting member 473 is completely accommodated in the accommodation space 4510, and the user needs to use tools such as tweezers to remove the light-transmitting member 473. In one embodiment, a portion of the light-transmitting member 473 is exposed in the accommodation space 4510 to facilitate the user to extract.

[0077] like Figure 15 to Figure 16 As shown, the present application also provides an embodiment that is convenient for users to clean debris. In this embodiment, the mounting portion 5511 is configured to be separable from the main body of the fixed shield 551 to allow the user to clean the light-transmitting member 573. In one embodiment, the mounting portion 5511 is configured to be rotatably connected to the fixed shield 551. When the light-transmitting member 573 needs to be cleaned, the user can first rotate the mounting portion 5511 to a certain angle, and then clean the light-transmitting member 573. In other embodiments, the mounting portion 5511 is configured to be detachably connected to the fixed shield 551. When the light-transmitting member 573 needs to be cleaned, the user can first separate the mounting portion 5511 from the main body of the fixed shield 551, and then clean the light-transmitting member 573.

[0078] like Figures 17 to 19 As shown, the present application also provides a light-emitting device 67 that is convenient for users to clean debris. In this embodiment, the light-emitting element 671, the lamp holder 672 and the light-transmitting member 673 are installed in the accommodating space 6510 of the mounting portion 6511. The light-emitting device 67 also includes a cleaning member 675, which can contact the light-transmitting member 673 to scrape off larger debris attached to the surface of the light-transmitting member 673. In one embodiment, the cleaning member 675 can be a scraping bar that can scrape off fine debris attached to the surface of the light-transmitting member 673, and the scraping bar can be made of rubber or plastic. In one embodiment, the cleaning member 675 can be rubber or felt, which can adhere to fine debris attached to the surface of the light-transmitting member 673.

[0079] The light emitting device 67 further includes an operating member 676 for driving the cleaning member 675 to clean the light-transmitting member 673, and the operating member 676 includes a rotating shaft 6761, an operating portion 6762, and a bearing portion 6763. The operating portion 6762 and the bearing portion 6763 are respectively located on both sides of the rotating shaft 6761, and at least part of the operating portion 6762 extends out of the accommodating space 6510 to allow the user to dial, and the side of the bearing portion 6763 close to the light-transmitting member 673 is used to carry the cleaning member 675. In some embodiments, the bearing portion 6763 includes a groove, and the cleaning member 675 can be placed in the groove. When the user dials the operating portion 6762, the operating portion 6762 drives the rotating shaft 6761 to rotate, and the rotating shaft 6761 drives the bearing portion 6763 to rotate, so that the cleaning member 675 disposed on the bearing portion 6763 also rotates, thereby scraping or adhering to the debris attached to the surface of the light-transmitting member 673.

[0080] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A saw comprising: a saw blade rotatable to cut a workpiece, the saw blade being arranged to extend in a cutting plane; A driving shaft, used for driving the saw blade to rotate about a first straight line, wherein the first straight line is perpendicular to the cutting plane; A guard, used to shield the saw blade from debris generated during cutting; A bottom plate, used to abut against the workpiece, the bottom plate is formed with a bottom plate plane contacting the workpiece, and the bottom plate is also formed with a first opening for allowing the saw blade to pass through to contact the workpiece; a light emitting device mounted to the guard, the light emitting device comprising a light emitting element capable of generating light to illuminate the saw blade; It is characterized in that when the light generated by the light emitting element irradiates the saw blade, the projection generated by the saw blade on the bottom plate plane overlaps with the cutting plane; Wherein, the distance between the central axis of the light emitting element and the cutting plane is 0 to 5 centimeters.

2. The saw according to claim 1, characterized in that The central axis of the light emitting element is located in the cutting plane.

3. The saw according to claim 1, characterized in that The shield comprises a fixed shield and a movable shield, the movable shield can rotate around the first straight line as an axis, and the light emitting device is mounted on the fixed shield.

4. The saw according to claim 3, characterized in that The movable shield comprises a light-transmitting groove, and the light-transmitting groove is configured such that when at least a portion of the movable shield rotates to between the fixed shield and the saw blade, the light generated by the light-emitting element can pass through the light-transmitting groove and irradiate the saw blade.

5. The saw according to claim 3, characterized in that The fixed shield includes a mounting portion for mounting the light emitting device, and the mounting portion includes: An accommodating space, used for accommodating the light-emitting element; The second opening is arranged below the light emitting element, and the light generated by the light emitting element in the accommodating space can pass through the second opening and irradiate the saw blade.

6. The saw according to claim 5, characterized in that The light emitting device further comprises: A lamp holder, used for mounting the light-emitting element; A light-transmitting member is used to cover the second opening. The light-transmitting member can prevent debris generated by the saw blade during cutting from entering the accommodating space. The light generated by the light-emitting element in the accommodating space can pass through the light-transmitting member and irradiate the saw blade.

7. The saw according to claim 6, characterized in that A portion of the light-transmitting member is exposed from the accommodating space, and the light-transmitting member can rotate around a third straight line.

8. The saw according to claim 6, characterized in that A portion of the light-transmitting member is exposed from the accommodating space, and the light-transmitting member can be pulled out from the mounting portion by a user.

9. The saw according to claim 6, characterized in that The mounting portion is configured to be separable from at least a portion of the fixed shield to allow a user to clean the light-transmitting member.

10. The saw according to claim 6, characterized in that The light emitting device further comprises: a cleaning member, in contact with the light-transmitting member, and capable of cleaning a portion in contact with the light-transmitting member when the light-transmitting member rotates; An operating member carries the cleaning member, and the operating member can be operated by a user to drive the cleaning member to clean the light-transmitting member.

11. The saw according to claim 10, characterized in that The operating member comprises: Rotating shaft; A bearing portion, used for bearing the cleaning member, one end of the bearing portion being fixedly connected to the rotating shaft; An operating portion, at least partially extending out of the accommodation space to allow being moved by a user, one end of the operating portion being fixedly connected to the rotating shaft; Wherein, the bearing portion and the operating portion are respectively arranged on two sides of the rotating shaft.

12. The saw according to claim 3, characterized in that The saw also includes: A motor, used for driving the driving shaft to rotate; A coupling portion capable of forming an electrical connection with a battery pack that provides power to the motor; A circuit board, capable of at least controlling the start and stop of the motor; A first wire electrically connecting the combining portion and the circuit board; A second wire electrically connecting the circuit board and the light emitting element; Wherein, the fixed shield comprises: The mounting portion comprises a receiving space for receiving the light emitting element; The wire groove is used to receive the second wire, and the wire groove is connected with the accommodating space.

13. The saw according to claim 1, characterized in that The distance between the projection of the first straight line on the bottom plate plane and the edge of the saw blade is L1; When the light generated by the light emitting element irradiates the saw blade, the projection of the saw blade on the bottom plane includes at least one edge line, and the maximum distance between the edge line and the projection of the first straight line on the bottom plane is L2; Where L2 is greater than or equal to L1.

14. The saw according to claim 1, characterized in that The distance between the projection of the first straight line on the bottom plate plane and the edge of the saw blade is L1; The bottom plate comprises a first opening for allowing the saw blade to pass through the first opening and contact the workpiece, and a maximum distance between an edge of the first opening and a projection of the first straight line in the plane of the bottom plate is L3; Wherein L3 is greater than or equal to L1.

15. The saw according to claim 1, characterized in that The luminous flux output by the light-emitting element is greater than or equal to 5 lumens.

16. The saw according to claim 1, characterized in that In the cutting plane, a line connecting the projection of the light emitting element and the projection of the first straight line constitutes a fourth straight line; The projection of the bottom plate plane in the cutting plane is a fifth straight line; The included angle between the fourth straight line and the fifth straight line is α, 3°≤α≤177°.

17. The saw according to claim 16, characterized in that 25°≤α≤70°。

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