A compound saw

Abstract

The present invention relates to a compound saw, in which a bevel cutting station for bevel cutting is provided on a base, and a bench cutting station for bench cutting is provided on the top of a frame. The rear end of the frame is rotatably connected to the base so that the front end thereof swings up and down relative to the base, thereby enabling the compound saw to switch between a bevel cutting mode and a bench cutting mode. By relative positioning of the saw blade and the frame, the upper and lower cutting edge portions of the saw blade are exposed at the top and bottom of the frame respectively. During the switching of the cutting modes of the compound saw, the saw blade and the frame no longer move relative to each other, thereby avoiding complicated driving, locking or unlocking. At the same time, only the upper guard and the lower guard need to be controlled so that one of the upper side and the lower side of the saw blade is in a covered state and the other is in an exposed state, thereby enabling the compound saw to selectively use the bevel cutting station or the bench cutting station to complete the switching of the cutting modes.

Description

Technical Field

[0001] The invention relates to the field of cutting tools, in particular to a compound saw. Background Art

[0002] Compound saws are widely used for their ability to perform both bench cutting and miter cutting. Compound saws utilize the portion of the saw blade above the tabletop for bench cutting and the portion below it for miter cutting. Existing compound saws vary in their structure, with the method for switching operating modes varying. Some adjust the relative position of the tabletop and saw blade by adjusting the height of the saw blade, while others adjust the relative position of the tabletop and saw blade by adjusting the height of the saw blade. This switching is accomplished by switching the operating mode using an electronic switch or locking or unlocking the guard.

[0003] For example, Chinese utility model patent number CN201520733769.4 discloses a compound saw, in which the saw blade is raised to the upper position of the table panel to switch to the table cutting mode, and the saw blade is lowered to the lower position of the table panel to switch to the bevel cutting mode. At the same time, this saw blade raising and lowering operation can also be coordinated with the lower guard and the table cutting guard. In the table cutting mode, the motor drive assembly drives the lower guard to swing upward to protect the lower part of the saw blade, while in the bevel cutting mode, the upper table cutting guard is used to protect the upper part of the saw blade.

[0004] Obviously, under existing technical conditions, although the above-mentioned structural design takes into account the conversion of use states while also protecting the non-working area of the saw blade, the working mode conversion process of the compound saw is relatively complicated. In particular, during the conversion process, the saw blade and the frame will move relative to each other. Therefore, when in use, the saw blade and its power system need to be driven, locked and unlocked separately, which makes the entire compound saw have too many parts and requires high manufacturing precision, and the structure is complex. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a compound saw that can realize switching cutting modes without relative movement of the saw blade and the frame in view of the current status of the existing technology.

[0006] The second technical problem to be solved by the present invention is to provide a compound saw that can automatically lock or unlock the upper and lower guards when switching to bench cutting or bevel cutting mode in response to the current status of the existing technology.

[0007] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a compound saw comprising:

[0008] a base having a beveling station for beveling disposed thereon;

[0009] a frame having a bench cutting station on its top for bench cutting, the rear end of the frame being rotatably connected to the base so that the front end thereof can swing up and down relative to the base, thereby switching the compound saw between a miter cutting mode and a bench cutting mode;

[0010] a saw blade rotatably disposed in the frame;

[0011] The saw blade is positioned relative to the frame, and its upper and lower edges are exposed at the top and bottom of the frame respectively, and the bottom and top of the frame are respectively provided with a first notch and a second notch along the front-back direction for the saw blade to extend out; and

[0012] The protective assembly includes an upper guard shield provided on the top of the frame and capable of covering the upper edge of the saw blade, and a lower guard shield provided on the bottom of the frame and capable of covering the lower edge of the saw blade. Both the upper guard shield and the lower guard shield can be flipped and restrained on the frame so that one of the upper edge and the lower edge of the saw blade is in a covered state and the other is in an exposed state, thereby selecting either the beveling station or the bench cutting station for use.

[0013] In order to ensure that the compound saw can complete the cutting action in both usage modes, preferably, the frame includes a body and a table panel arranged on the top of the body, the first incision is opened at the bottom of the body, and the second incision is opened on the table panel, and when the frame is swung upward to the bevel cutting mode, the lower edge of the saw blade extending from the first incision to below the body forms a first cutting edge for bevel cutting; when the frame is swung downward to the table cutting state, the upper edge of the saw blade extending from the second incision to above the table panel forms a second cutting edge for table cutting.

[0014] Preferably, the rear end of the upper guard can be rotatably connected to the table panel and its rotation point is located on the rear side of the second incision, so that its front side can swing up and down relative to the table panel to correspondingly expose the second cutting edge on the upper side of the saw blade or cover the second cutting edge.

[0015] In order to ensure that the first cutting edge of the lower side of the saw blade can be protected in the bench cutting mode and automatically exposed in the bevel cutting mode, preferably, the interior of the frame is hollow to form a mounting cavity, and the lower guard includes a first cover body and a second cover body, and the first cover body and the second cover body are both arranged on the periphery of the saw blade, and the upper ends of both are rotatably connected in the mounting cavity, so that the lower ends of each can move downward and approach each other to engage on the lower side of the frame to form a complete lower guard, or move upward and away from each other under the push of the workpiece to shrink into the mounting cavity respectively, so that the first cutting edge of the lower side of the saw blade is exposed at the first incision.

[0016] In order to further solve the second technical problem mentioned above, the technical solution adopted by the present invention is as follows: a connecting rod assembly, a first elastic member, and a second elastic member are further provided in the frame, the connecting rod assembly including a first connecting rod for locking the upper guard and a second connecting rod for locking the lower guard, the first elastic member acts on the first connecting rod so that the first connecting rod always has a tendency to lock the upper guard when the upper guard is flipped downward to cover the second cutting edge, and the second elastic member acts on the second connecting rod so that the second connecting rod always has a tendency to unlock the lower guard, thereby allowing the first cover body and the second cover body of the lower guard to move upward and retract into the frame. The cooperation between such a connecting rod assembly and the two elastic members can automatically lock the upper guard in the bevel cutting mode while taking into account the unlocking of the lower guard, which is very convenient.

[0017] In order to ensure the simplicity of the conversion process, the corresponding cutting edge of the saw blade can be protected in one step when the mode is converted. Preferably, a driving member is also provided on the base, and the lower end of the driving member is constrained on the base so that the upper end thereof swings up and down relative to the base, and the driving member can simultaneously abut against the first connecting rod and the second connecting rod in the connecting rod assembly when swinging upward, so that the first connecting rod is in a state of unlocking the upper guard and the second connecting rod is in a state of locking the lower guard, thereby limiting the first cover body and the second cover body of the lower guard from shrinking into the mounting cavity to cover the lower edge of the saw blade.

[0018] Specifically, the first connecting rod and the second connecting rod are both located beside the saw blade, and the frame is provided with an opening on the front end wall for the first connecting rod and the second connecting rod to extend out. When the compound saw is in the table cutting mode, the upper end of the driving member swings to the opening, thereby simultaneously abutting against the first connecting rod and the second connecting rod.

[0019] In order to ensure that the connecting rod can lock or unlock the upper guard cover, preferably, the first connecting rod includes a horizontal section and a vertical section, wherein the front end of the horizontal section is located at the opening of the front end wall of the frame, and the vertical section is arranged at the rear end of the horizontal section to form an L-shaped structure. A first rotating shaft is passed through the middle of the horizontal section, and the first connecting rod can be rotatably installed in the mounting cavity through the first rotating shaft, and in the table cutting mode, the top of the driving member can abut against the bottom of the front end of the horizontal section, so that the rear end of the horizontal section drives the vertical section to swing downward and disengage from the swing path of the front side of the upper guard cover.

[0020] In order to prevent the driving member from disengaging from the connecting rod assembly after interaction, preferably, the free end of the driving member has a lock catch, and a lock seat is correspondingly provided at the front end of the frame, and a lock rod and a third elastic member are provided in the lock seat. When the driving member is simultaneously resting on the first connecting rod and the second connecting rod, the lock rod is located at the front side of the lock catch and is at least partially limited in the lock catch, and the third elastic member acts on the lock rod so that the lock rod always has a tendency to be locked in the lock catch.

[0021] In order to ensure that the second connecting rod can act on the two cover bodies of the lower guard at the same time to prevent the two cover bodies from moving upward, preferably, the second connecting rod is arranged horizontally, and two spaced-apart protrusions are provided on it. In the table cutting mode, the driving member swings upward to the side and abuts against the front end of the second connecting rod, thereby causing the second connecting rod to move horizontally. The two protrusions are respectively located on the upward movement path of the first cover body and the second cover body, so that the first cover body and the second cover body are in a downward moving engagement state, thereby forming a complete lower guard state.

[0022] Compared with the prior art, the advantages of the present invention are: in the compound saw, the saw blade and the frame are relatively positioned so that the cutting edge portions on the upper and lower sides of the saw blade are exposed at the top and bottom of the frame respectively. During the conversion of the compound saw cutting mode, the saw blade and the frame no longer move relative to each other, thereby avoiding a complex linkage structure. At the same time, it is only necessary to control the upper guard and the lower guard so that one of the upper side and the lower side of the saw blade is in a covered state and the other is in an exposed state, so that either the miter cutting station or the bench cutting station can be selected to complete the conversion of the compound saw cutting mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the overall structure of the compound saw in the first embodiment of the present invention (table cutting mode);

[0024] Figure 2 Schematic diagram of the overall structure of the compound saw in the first embodiment of the present invention (bevel cutting mode);

[0025] Figure 3 Schematic diagram of the cooperation between the driving member and the connecting rod assembly in the first embodiment of the present invention (part of the frame is omitted);

[0026] Figure 4 Schematic diagram of the cooperation between the connecting rod assembly and the frame;

[0027] Figure 5 A schematic diagram of locking the second connecting rod with the first cover body and the second cover body in the lower shield;

[0028] Figure 6 is an overall schematic diagram of the second connecting rod;

[0029] Figure 7 The overall schematic diagram of the rack;

[0030] Figure 8 This is an overall schematic diagram of the first structure of the lock base in the first embodiment of the present invention;

[0031] Figure 9 This is an overall schematic diagram of the second structure of the lock base in the second embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0033] Example 1:

[0034] like Figures 1 to 8 FIG. 1 shows a preferred embodiment of the present invention. In this embodiment, the compound saw comprises a base 1, a frame 2, and a guard assembly. The base 1 is provided with a miter cutting station 1a for bevel cutting, and the top of the frame 2 is provided with a bench cutting station 2a for bench cutting. The rear end of the frame 2 is rotatably connected to the base 1, allowing its front end to swing up and down relative to the base 1, thereby switching the compound saw between miter cutting mode and bench cutting mode. A saw blade 3 is rotatably mounted within the frame 2.

[0035] In this embodiment, the saw blade 3 is positioned relative to the frame 2, specifically mounted on the frame 2 via a central axis. Driven by a motor (not shown), the saw blade 3 is capable of rotating relative to the frame 2. Since motor-driven rotation of the saw blade 3 is a conventional design, its further description is omitted here. The upper and lower edges of the saw blade 3 are exposed at the top and bottom of the frame 2, respectively. The bottom and top of the frame 2 are respectively provided with a first notch 201 and a second notch 202 extending in the front-to-back direction, through which the saw blade 3 extends. Specifically, the above-mentioned frame 2 includes a main body 21 and a table panel 22 arranged on the top of the main body 21, a first incision 201 is opened at the bottom of the main body 21, and a second incision 202 is opened on the table panel 22. In addition, when the frame 2 swings upward to the bevel cutting mode, the lower part (i.e., the lower edge) of the saw blade 3 extending from the first incision 201 to below the main body 21 forms a first cutting edge for bevel cutting; when the frame 2 swings downward to the table cutting state, the upper part (i.e., the upper edge) of the saw blade 3 extending from the second incision 202 to above the table panel 22 forms a second cutting edge for table cutting. The above-mentioned protective assembly includes an upper guard 41 provided on the top of the frame 2 and capable of covering the upper edge of the saw blade 3, and a lower guard 42 provided on the bottom of the frame 2 and capable of covering the lower edge of the saw blade 3. Both the upper guard 41 and the lower guard 42 can be flipped and restrained on the frame 2 so that one of the upper edge and the lower edge of the saw blade 3 is in a covered state and the other is in an exposed state, thereby selecting either the beveling station 1a or the bench cutting station 2a for use.

[0036] To ensure effective protection, the rear end of the upper guard 41 in this embodiment is rotatably connected to the table panel 22, with its rotation point located behind the second notch 202. This allows its front end to swing up and down relative to the table panel 22 (specifically, on the material divider connected to the table panel 22) to expose or cover the second cutting edge of the upper portion of the saw blade 3. The interior of the frame 2 is hollow, forming a mounting cavity 20. The lower guard 42 specifically includes a first cover body 421 and a second cover body 422. Both the first cover body 421 and the second cover body 422 are disposed around the periphery of the saw blade 3, and their upper ends are rotatably connected within the mounting cavity 20, allowing their respective lower ends to move downward and toward each other to join together on the lower side of the frame 2 to form a complete lower guard 42, or to move upward and away from each other under the push of the workpiece to retract into the mounting cavity 20, thereby exposing the lower edge of the saw blade 3, i.e., the lower first cutting edge, to the first notch 201. The first cover body 421 is specifically rotatably connected to the frame 2 through a second rotating shaft 423 that passes through its upper end and is arranged at the rear end of the frame 2. The upper end of the second cover body 422 is coaxial with the saw blade 3. During actual use, if there is no external force, the first cover body 421 and the second cover body 422 can always be joined on the lower side of the frame 2 to form a complete lower guard 42 due to the action of gravity in a natural state. When the workpiece enters the beveling station 1a, it will push the first cover body 421 and the second cover body 422, so that one or both of them move up and shrink into the installation cavity 20, thereby exposing the saw blade 3 for cutting.

[0037] When switching between cutting modes, the exposure of one of the upper cutting edge or the lower cutting edge of the saw blade 3 and the simultaneous covering of the other cutting edge are achieved by the connecting rod assembly 5. Specifically, the connecting rod assembly 5, a first elastic member (not shown), and a second elastic member (not shown) are further provided within the frame 2. The connecting rod assembly 5 includes a first connecting rod 51 for locking the upper guard 41 and a second connecting rod 52 for locking the lower guard 42. The first elastic member 5a acts on the first connecting rod 51 so that the first connecting rod 51 always tends to lock the upper guard 41 when the upper guard 41 is flipped downward to cover the second cutting edge. The second elastic member acts on the second connecting rod 52 so that the second connecting rod 52 always tends to unlock the lower guard 42, thereby enabling the first cover 421 and the second cover 422 of the lower guard 42 to move upward and retract into the frame 2.

[0038] To ensure that the two connecting rods can be driven in a single operation, a driving member 6 is further provided on the base 1. The lower end of the driving member 6 is constrained on the base 1 so that its upper end swings up and down relative to the base 1. When the driving member 6 swings upward, it can simultaneously abut against the first connecting rod 51 and the second connecting rod 52 in the connecting rod assembly 5, so that the first connecting rod 51 overcomes the elastic force of the first elastic member, thereby unlocking the upper guard 41 and locking the lower guard 42. The second connecting rod 52 thus restricts the first cover 421 and the second cover 422 of the lower guard 42 from retracting into the mounting cavity 20 to cover the lower edge of the saw blade 3. In other words, the function of the second connecting rod 52 is to lock and unlock the lower guard 42, and its unlocking action is triggered by the second elastic member. The second link 52 remains unlocked in the natural state, so that the first cover body 421 and the second cover body 422 of the lower guard 42 can freely retract without restriction. This state corresponds to the bevel cutting mode of the entire compound saw, that is, the saw blade 3 is switched to the first cutting edge of the lower edge for cutting; and the locking action of the second link 52 is triggered by the driving member 6. After the driving member 6 drives the second link 52 to overcome the elastic force of the second elastic member, it moves to the rotation path of the first cover body 421 and the second cover body 422, so that the rotation of the two is restricted and cannot be retracted into the mounting cavity 20. This state corresponds to the table cutting mode of the entire compound saw, that is, the saw blade 3 is switched to the second cutting edge of the upper edge for cutting, and the first cutting edge of the lower edge of the saw blade 3 is engaged by the first cover body 421 and the second cover body 422 of the lower guard 42 and is wrapped in the lower guard 42, thereby avoiding the danger caused by exposure, and also ensuring that foreign matter will not enter the mounting cavity 20 and affect the operation of the saw blade 3.

[0039] In this embodiment, the first connecting rod 51 and the second connecting rod 52 are both located beside the saw blade 3. The frame 2 is provided with an opening 23 on the front end wall for the first connecting rod 51 and the second connecting rod 52 to extend out. When the compound saw is in the table cutting mode, the upper end of the driving member 6 swings to the opening 23, thereby simultaneously abutting against the first connecting rod 51 and the second connecting rod 52. Specifically, the above-mentioned first connecting rod 51 includes a horizontal section 511 and a vertical section 512, wherein the front end of the horizontal section 511 is located at the opening 23 of the front end wall of the frame 2, and the vertical section 512 is arranged at the rear end of the horizontal section 511 to form an L-shaped structure. A first rotating shaft 513 is passed through the middle of the horizontal section 511, and the first connecting rod 51 can be rotatably installed in the installation cavity 20 through the first rotating shaft 513, and in the table cutting mode, the top of the driving member 6 can abut against the bottom of the front end of the horizontal section 511, so that the rear end of the horizontal section 511 drives the vertical section 512 to swing downward and break away from the swing path on the front side of the upper shield 41. The second connecting rod 52 is arranged horizontally, and two spaced-apart protrusions 521 are provided on it. In the table cutting mode, the driving member 6 swings upward to the side and abuts against the front end of the second connecting rod 52, thereby causing the second connecting rod 52 to move horizontally (that is, the driving member 6 first swings to a vertical state, and the frame 2 will swing downward as a whole during the conversion process from bevel cutting to table cutting, so that the first connecting rod 51 and the second connecting rod 52 actively contact the driving member 6 during the swinging process of the random frame 2, thereby completing the corresponding driving action). The two protrusions 521 are respectively located on the upward movement path of the first cover body 421 and the second cover body 422, so that the first cover body 421 and the second cover body 422 are in a downward moving engaged state, thereby forming a complete lower shield 42 state. In addition, since the saw blade 3 uses the corresponding cutting edge to perform cutting actions after the compound saw switches to a different working mode, an electric switch is provided in the mounting cavity 20 of the frame 2. The electric switch in this embodiment is arranged on the moving path of the second connecting rod 52, and a trigger rod 522 is provided on the second connecting rod. When the second connecting rod 52 moves to lock and unlock the lower guard 42, the trigger rod 522 thereon can simultaneously control the electric switch to switch the circuit, thereby achieving electromechanical synchronous conversion.

[0040] In addition, in addition to being able to trigger the drive of the connecting rod, the driving member 6 in this embodiment can also achieve locking and unlocking with the frame 2, wherein the free end of the above-mentioned driving member 6 has a lock buckle 61, and a lock seat 24 is correspondingly provided at the front end of the frame 2, and the lock seat 24 has a locking rod 241 and a third elastic member 242. When the driving member 6 is simultaneously against the first connecting rod 51 and the second connecting rod 52, the locking rod 241 is located at the front side of the lock buckle 61 and is at least partially limited in the lock buckle 61. The third elastic member 242 acts on the locking rod 241 so that the locking rod 241 always has a tendency to be locked in the lock buckle 61. With the matching design of the lock catch 61 and the lock seat 24 at the front end of the housing 2, in the bench cutting mode, the frame 2 can be prevented from rotating relative to the base 1 by simply limiting the lock rod 241 within the lock catch 61, thereby ensuring that the compound saw has a stable usage configuration in the bench cutting mode. At the same time, the design of the lock rod 421 being located in front of the lock catch 61 can act in the opposite direction on the lock catch 61, so that the entire driving member 6 maintains its abutment against the first connecting rod 51 and the second connecting rod 52, thus achieving two goals at one stroke.

[0041] In addition, see Figure 8 In this embodiment, the above-mentioned locking rod 241 extends vertically, and its middle part is rotatably connected to the lock seat 24 through the connecting shaft 244. The bottom of the locking rod 241 has a locking hook 245 extending backward. The above-mentioned third elastic member 242 is arranged on the upper side of the locking rod 241 and can act on the upper end of the locking rod 241 to make the upper end of the locking rod 241 move forward and the rear end of the locking rod 241 move backward under the drive of its own upper end, so that the locking hook 245 is hooked in the lock buckle 61.

[0042] Example 2:

[0043] like Figure 9 As shown, this is a second preferred embodiment of the present invention. The difference between this embodiment and the above embodiment is that: the above-mentioned locking rod 241 extends forward and backward, and its rear end has an end 243 adapted to the lock buckle 61, and the above-mentioned third elastic member 242 is sleeved on the locking rod 241 and abuts against the end 243, thereby driving the locking rod 241 to move and be limited in the lock buckle 61.

[0044] In addition, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used in the specification and claims of the present invention to describe various exemplary structural parts and elements of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A compound saw comprising: A base (1) having a beveling station (1a) thereon; A frame (2) having a bench cutting station (2a) on its top, wherein the rear end of the frame (2) is rotatably connected to the base (1) so that the front end thereof can swing up and down relative to the base (1), thereby switching the compound saw between a bevel cutting mode and a bench cutting mode; A saw blade (3) is rotatably arranged in the frame (2); The invention is characterized in that: the saw blade (3) is positioned relative to the frame (2), and its upper and lower edges are exposed at the top and bottom of the frame (2), respectively; the bottom and top of the frame (2) are respectively provided with a first notch (201) and a second notch (202) for the saw blade (3) to extend in the front-back direction; and A protective assembly comprises an upper guard (41) provided on the top of a frame (2) and capable of covering the upper edge of a saw blade (3) and a lower guard (42) provided on the bottom of the frame (2) and capable of covering the lower edge of the saw blade (3), wherein both the upper guard (41) and the lower guard (42) can be restrained on the frame (2) in a flip manner so that one of the upper edge and the lower edge of the saw blade (3) is in a covered state and the other is in an exposed state, thereby selecting either a beveling station (1a) or a bench cutting station (2a); The frame (2) is further provided with a connecting rod assembly (5), a first elastic member, and a second elastic member. The connecting rod assembly (5) includes a first connecting rod (51) for locking the upper shield (41) and a second connecting rod (52) for locking the lower shield (42). The first elastic member acts on the first connecting rod (51) so that the first connecting rod (51) always has a tendency to lock the upper shield (41) when the upper shield (41) is flipped downward to cover the second cutting edge. The second elastic member acts on the second connecting rod (52) so that the second connecting rod (52) always has a tendency to unlock the lower shield (42), so that the first cover body (421) and the second cover body (422) of the lower shield (42) can move upward and shrink into the frame (2). The base (1) is also provided with a driving member (6), the lower end of which is constrained on the base (1) so that the upper end thereof can swing up and down relative to the base (1), and the driving member (6) can simultaneously abut against the first connecting rod (51) and the second connecting rod (52) in the connecting rod assembly (5) in the upward swinging state, so that the first connecting rod (51) is in a state of unlocking the upper guard (41) and the second connecting rod (52) is in a state of locking the lower guard (42), thereby limiting the first cover body (421) and the second cover body (422) of the lower guard (42) from shrinking into the mounting cavity (20) to cover the lower edge of the saw blade (3).

2. The compound saw according to claim 1, wherein: The frame (2) comprises a body (21) and a table panel (22) arranged on the top of the body (21); the first notch (201) is opened at the bottom of the body (21); the second notch (202) is opened on the table panel (22); and, when the frame (2) swings upward to a bevel cutting mode, the lower edge of the saw blade (3) extending from the first notch (201) to below the body (21) forms a first cutting edge for bevel cutting; and when the frame (2) swings downward to a table cutting mode, the upper edge of the saw blade (3) extending from the second notch (202) to above the table panel (22) forms a second cutting edge for table cutting.

3. The compound saw according to claim 2, wherein: The rear end of the upper guard (41) is rotatably connected to the table panel (22) and its rotation point is located at the rear side of the second incision (202), so that its front side can swing up and down relative to the table panel (22) to correspondingly expose the second cutting edge on the upper side of the saw blade (3) or cover the second cutting edge.

4. The compound saw according to claim 3, wherein: The frame (2) is hollow inside to form a mounting cavity (20), and the lower guard (42) includes a first cover body (421) and a second cover body (422), the first cover body (421) and the second cover body (422) are both arranged on the periphery of the saw blade (3), and the upper ends of both are rotatably connected in the mounting cavity (20), so that their respective lower ends can move downward and approach each other to join at the lower side of the frame (2) to form a complete lower guard (42), or move upward and away from each other under the push of the workpiece to shrink into the mounting cavity (20), so that the first cutting edge of the lower side of the saw blade (3) is exposed at the first incision (201).

5. The compound saw according to claim 1, wherein: The first connecting rod (51) and the second connecting rod (52) are both located beside the saw blade (3); an opening (23) is provided on the front end wall of the frame (2) for the first connecting rod (51) and the second connecting rod (52) to extend out; when the compound saw is in a table cutting mode, the upper end of the driving member (6) swings to the opening (23), thereby simultaneously abutting against the first connecting rod (51) and the second connecting rod (52).

6. The compound saw according to claim 5, characterized in that: The first connecting rod (51) includes a horizontal section (511) and a vertical section (512), wherein the front end of the horizontal section (511) is located at the opening (23) of the front end wall of the frame (2), and the vertical section (512) is arranged at the rear end of the horizontal section (511) to form an L-shaped structure. A first rotating shaft (513) is passed through the middle of the horizontal section (511), and the first connecting rod (51) is rotatably mounted in the mounting cavity (20) via the first rotating shaft (513). In the table cutting mode, the top of the driving member (6) can abut against the bottom of the front end of the horizontal section (511), so that the rear end of the horizontal section (511) drives the vertical section (512) to swing downward and escape from the swing path of the front side of the upper shield (41).

7. The compound saw according to claim 6, characterized in that: The free end of the driving member (6) has a lock catch (61), and a lock seat (24) is correspondingly provided at the front end of the frame (2). The lock seat (24) has a lock rod (241) and a third elastic member (242). When the driving member (6) is simultaneously abutting against the first connecting rod (51) and the second connecting rod (52), the lock rod (241) is located at the front side of the lock catch (61) and is at least partially limited in the lock catch (61). The third elastic member (242) acts on the lock rod (241) so that the lock rod (241) always has a tendency to be only in the lock catch (61).

8. The compound saw according to claim 7, wherein: The second connecting rod (52) is arranged transversely, and two spaced-apart convex columns (521) are provided on it. In the table cutting mode, the driving member (6) swings upward to the side and contacts the front end of the second connecting rod (52), thereby causing the second connecting rod (52) to move transversely. The two convex columns (521) are respectively located on the upward movement path of the first cover body (421) and the second cover body (422), so that the first cover body (421) and the second cover body (422) are in a downward moving engagement state, thereby forming a complete lower shield (42).

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