Composite saw with saw blade protection device

Abstract

The invention discloses a composite saw with a saw blade protection device, a front protection cover and a rear protection cover are arranged on the periphery of a saw blade in a covering mode, the rear protection cover is fixedly connected with a base, the front protection cover comprises a first cover body and a second cover body which are arranged in a split mode, and the second cover body is located between the rear protection cover and the first cover body. The upper end of the first cover body and the center of the second cover body are respectively hinged to the frame; the first cover swings between a first position and a second position relative to the frame. The rear protective cover is fixedly connected with the base, when the frame is pressed downwards, the second cover body swings upwards relative to the first cover body under the action of the linkage rod, and when the frame is warped upwards, the second cover body swings downwards relative to the first cover body under the action of the torsion spring, so that the linkage structure of the protective device is highly simplified; redundant parts and a tedious connecting mode in a traditional complex linkage structure are abandoned, and the material cost, the machining cost and the assembling cost are effectively reduced; and meanwhile, the probability of mechanical faults is reduced due to the simplified structure.

Description

Technical Field

[0001] The present invention relates to the technical field of electric saws, and particularly to a compound saw with a saw blade protection device. Background Art

[0002] A compound saw is a common electric cutting tool that can be switched to two different working states: a miter saw and a table saw. Existing compound saws include a saw blade, a movable table board (i.e., the table cutting workbench) and a base (i.e., the miter cutting workbench). When the compound saw is in the table cutting working state, feeding and cutting are performed from the movable table board above the compound saw. When the compound saw is in the miter cutting working state, feeding and cutting are performed from the base below the compound saw. According to the current safety standards, when the electric miter saw and the table saw are in the non-working state, the cutting edge of the saw blade should be ensured not to be exposed and not to be touched. For a compound saw, when it is switched to either the table cutting or the miter cutting working state, it should be ensured that the cutting edge of the saw blade corresponding to the other working state is not exposed and not to be touched.

[0003] For existing compound saws, when the compound saw is in the miter cutting mode, a protective cover for protecting the lower cutting edge of the saw blade is installed on the frame. The protective cover usually includes a front protective cover and a rear protective cover, and the front protective cover and the rear protective cover are mostly of a split structure. When the far hinged end of the frame is lifted, the front protective cover and the rear protective cover are closed to cover the cutting edge of the saw blade inside the protective cover; when the lifted end of the frame is pressed down, the front protective cover and the rear protective cover gradually open and the protective cover has the largest opening amount when the frame is parallel to the base, so as to expose the cutting edge of the saw blade for cutting work.

[0004] For example, a compound saw disclosed in a Chinese invention patent (publication number: CN105081453A) includes a frame and a saw blade for cutting workpieces. A saw blade protective cover assembly is sleeved on the saw blade. The saw blade protective cover assembly is composed of a front protective cover and a rear protective cover. The front protective cover and the rear protective cover can swing around the same axis as the center of the saw blade. During the process of the saw blade ascending and descending relative to the frame, the saw blade protective cover assembly is linked with the saw blade through a linkage mechanism, so that when the saw blade ascends relative to the frame, the front protective cover and the rear protective cover are converted from an open state to a closed state, and when the saw blade descends relative to the frame, the front protective cover and the rear protective cover are converted from a closed state to an open state. The linkage mechanism includes a linkage rod and a protective cover linkage rod assembly. The protective cover linkage rod assembly is composed of at least three linkage rods. Among them, the outer end of the first linkage rod is hinged to the rocker frame seat, the outer end of the second linkage rod is hinged to the front protective cover, and the outer end of the third linkage rod is hinged to the rear protective cover.

[0005] However, a compound saw disclosed in the above-mentioned prior art has a saw blade guard assembly that is linked to the saw blade through a linkage mechanism. The linkage mechanism includes a linkage rod and a guard linkage rod assembly. The structural design of the linkage mechanism is relatively complex and has the following disadvantages: ① The complex structure increases the number of parts, which not only increases the difficulty of production, processing and assembly, and pushes up the manufacturing cost, but also increases the space occupied by the linkage mechanism, limiting the overall compact design of the compound saw; ② The combination of a large number of precision parts significantly increases the probability of mechanical failure. During long-term use, problems such as wear and looseness between parts occur frequently, increasing the maintenance frequency and repair cost of the compound saw. During maintenance, professional technicians need to disassemble the complex structure for inspection, which is time-consuming and labor-intensive. ③ When the complex linkage mechanism is in operation, there are risks such as component jamming and response delay, which may cause the guard to fail to follow the saw blade movement in time, reducing the timeliness and effectiveness of protection and posing safety hazards to the operator.

[0006] Therefore, it is necessary to improve the existing technology. Summary of the invention

[0007] The object of the present invention is to provide a compound saw with a saw blade protection device in view of the defects and shortcomings of the prior art, wherein the rear protective cover is fixedly connected to the base, and the front protective cover includes a first cover body and a second cover body which are separately arranged. When the frame performs a downward pressing action, the second cover body swings upward relative to the first cover body under the action of a linkage rod. When the frame performs an upward tilting action, the second cover body swings downward relative to the first cover body under the action of a torsion spring, thereby simplifying the linkage structure and effectively reducing the material, processing and assembly costs.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A compound saw with a saw blade protection device, comprising a base, a frame and a head assembly. The head assembly has a saw blade accommodated in the frame and partially exposed outside the frame. A front protective cover and a rear protective cover are provided outside the circumference of the saw blade. The rear protective cover is fixedly connected to the base. The front protective cover includes a first cover body and a second cover body which are separately arranged. The second cover body is located between the first cover body and the rear protective cover. The upper end of the first cover body and the center of the second cover body are respectively hinged to the frame. A linkage rod is hinged between the second cover body and the base. When the frame makes a downward pressing action, the first cover body moves downward synchronously with the frame, and the second cover body swings upward relative to the first cover body. When the frame makes an upward tilting action, the first cover body moves upward synchronously with the frame, and the second cover body swings downward relative to the first cover body. The first cover body swings between a first position and a second position relative to the frame. When the first cover body is in the first position, the first cover body and the second cover body are in limit cooperation to limit the upward swing of the second cover body, and the lower end of the second cover body abuts against the rear protective cover. When the first cover body is in the second position, the first cover body and the second cover body are in dislocation cooperation to release the limit on the second cover body. An elastic locking mechanism is arranged between the frame and the first cover body, and the elastic locking mechanism makes the first cover body always have a tendency to move towards the first position.

[0009] Further, one end of the linkage rod is eccentrically hinged to the second cover body, and the other end of the linkage rod is hinged to the base.

[0010] Further, the linkage rod is provided with a kidney-shaped hole, and the linkage rod is hinged to the base through the kidney-shaped hole. A torsion spring is arranged between the second cover body and the frame, and the torsion spring makes the second cover body always have a tendency to swing downward relative to the frame. When the frame makes a downward pressing action, the second cover body swings upward relative to the first cover body under the action of the linkage rod. When the frame makes an upward tilting action, the second cover body swings downward relative to the first cover body under the action of the torsion spring.

[0011] Further, when the first cover body is in the first position, the lower end of the first cover body abuts against the upper edge of the second cover body, and the lower end of the first cover body is provided with a first convex block for abutting against the upper edge of the second cover body. When the first cover body is in the second position, the second cover body covers the outside of the first cover body.

[0012] Further, the elastic locking mechanism includes a transmission rod and a compression spring. The transmission rod is fixedly connected to the first cover body, and the compression spring is abutted between the frame and the first cover body, so that the first cover body always has a tendency to move towards the first position.

[0013] Further, the first cover body is provided with a first stop block, the frame is provided with a second stop block corresponding to the first stop block, and the transmission rod and the compression spring are sequentially arranged between the first stop block and the second stop block.

[0014] Furthermore, the transmission rod is fixedly connected to the first stopper by means of bolts, and the compression spring is sleeved on the outer circumference of the bolts.

[0015] Furthermore, the rear protective cover is provided with a supporting portion that abuts against the lower end of the second cover body.

[0016] Furthermore, it also includes a movable platform and a follower shield, and the follower shield is fixedly connected to the lower end surface of the movable platform.

[0017] Furthermore, the movable guard has a third position and a fourth position relative to the saw blade. When the movable guard is located at the third position, the movable guard blocks the cutting edge at the upper end of the saw blade, and the cutting edge at the lower end of the saw blade extends out of the movable guard; when the movable guard is located at the fourth position, the movable guard blocks the cutting edge at the lower end of the saw blade, and the cutting edge at the upper end of the saw blade extends out of the movable guard.

[0018] After adopting the above structure, the beneficial effects of the present invention are as follows: a compound saw with a saw blade protection device described in the present invention, the outer peripheral cover of the saw blade is provided with a front protective cover and a rear protective cover, the rear protective cover is fixedly connected to the base, the front protective cover includes a first cover body and a second cover body which are separately arranged, the second cover body is located between the first cover body and the rear protective cover, the upper end of the first cover body and the center of the second cover body are respectively hinged to the frame; the first cover body swings between a first position and a second position relative to the frame, when the first cover body is located at the first position, the first cover body and the second cover body are limitedly matched to limit the second cover body from swinging upward, and the lower end of the second cover body is abutted against the rear protective cover; when the first cover body is located at the second position, the first cover body and the second cover body are misaligned to release the limitation on the second cover body. The rear protective cover of the present invention is fixedly connected to the base. When the frame performs a downward pressing action, the second cover body swings upward relative to the first cover body under the action of the linkage rod. When the frame performs an upward tilting action, the second cover body swings downward relative to the first cover body under the action of the torsion spring. This realizes a highly simplified linkage structure of the protective device, abandons redundant components and cumbersome connection methods in traditional complex linkage structures, and effectively reduces material, processing and assembly costs. At the same time, the streamlined structure reduces the probability of mechanical failure, ensuring that it can still maintain a stable and accurate operating state under long-term and high-frequency use scenarios, and has both economy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the specific embodiments of the present invention, the following will briefly introduce the drawings required for the description of the specific embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is the overall structure schematic diagram of the present invention Figure 1 (the compound saw is in the miter cut mode); Figure 2 is the overall structure schematic diagram of the present invention Figure 2 (the compound saw is in the miter cut mode); Figure 3 is the exploded view of the frame, elastic locking mechanism, rear protective cover and front protective cover of the present invention; Figure 4 is the schematic diagram of the mating connection of the front protective cover and the rear protective cover of the present invention Figure 1 (the first cover body is in the first position); Figure 5 is the sectional view of the mating connection of the front protective cover and the rear protective cover of the present invention (the first cover body is in the first position); Figure 6 is the schematic diagram of the mating connection of the first cover body and the second cover body of the present invention (the first cover body is in the second position); Figure 7 is the schematic diagram of the mating connection of the base, frame, elastic locking mechanism, rear protective cover and front protective cover of the present invention; Figure 8 is of the present invention Figure 7 enlarged schematic diagram of the structure at A; Figure 9 is the three-dimensional schematic diagram of the second cover body of the present invention; Figure 10 is the three-dimensional schematic diagram of the first cover body of the present invention; Figure 11 is the three-dimensional schematic diagram of the rear protective cover of the present invention; Figure 12 is the schematic diagram of the mating connection of the follower guard, saw blade and movable platen of the present invention Figure 1 (the follower guard is in the third position); Figure 13 is the schematic diagram of the mating connection of the follower guard, saw blade and movable platen of the present invention Figure 2 (the follower guard is in the fourth position); Figure 14 is the schematic diagram of the mating connection of the follower guard and the movable platen of the present invention; Figure 15 is the exploded view of the follower guard of the present invention; Figure 16 is the overall structural schematic diagram of the present invention Figure 3 (The composite saw is in the table cutting mode).

[0021] Figures 1 to 16 The reference numerals in the figure are as follows: 1. Base; 11. Base bracket; 2. Frame; 21. Second stop block; 22. Second insertion hole; 23. Square hole; 3. Saw blade; 4. Front protective cover; 41. First cover body; 411. First convex block; 412. First stop block; 4121. Stop edge; 413. Second convex block; 4131. Clamping block; 4132. Second inclined surface; 414. First hinge hole; 42. Second cover body; 421. Convex rib; 4211. First inclined surface; 422. Card slot; 423. Second hinge hole; 424. First insertion hole; 5. Rear protective cover; 51. Supporting part; 52. First protective plate; 53. Second protective plate; 54. Accommodating cavity; 6. Elastic locking mechanism; 61. Transmission rod; 62. Compression spring; 63. Bolt; 7. Linking rod; 71. Kidney-shaped hole; 72. Screw rod; 8. Torsion spring; 81. First hook; 82. Second hook; 9. Movable table board; 10. Follow-up protective cover; 101. Connecting part; 102. Accommodating space; 103. Cutaway structure; 104. First cover plate; 1041. First limiting part; 1042. Avoidance hole; 1043. Strip-shaped hole; 1044. Circular hole; 105. Second cover plate; 1051. Second limiting part; 1052. Yielding groove; 1053. Sealing strip. Detailed implementation manners

[0022] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0023] In the description of the present invention, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0024] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, if the term "a plurality of" appears, the meaning of the term "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In the present invention, unless otherwise clearly defined and limited, if terms such as "mounted", "connected", "coupled", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0027] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present invention are only for illustrative purposes and do not represent the only embodiments.

[0028] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0029] As Figures 1 to 16As shown in the figure, a compound saw with a saw blade protection device includes a base 1, a frame 2 and a head assembly. The head assembly has a saw blade 3 accommodated in the frame 2 and partially exposed outside the frame 2. A front protective cover 4 and a rear protective cover 5 are provided outside the circumference of the saw blade 3. The rear protective cover 5 is fixedly connected to the base 1. The front protective cover 4 includes a first cover body 41 and a second cover body 42 which are separately arranged. The second cover body 42 is located between the first cover body 41 and the rear protective cover 5. The upper end of the first cover body 41 and the center of the second cover body 42 are respectively hinged to the frame 2. A linkage rod 7 is hinged between the second cover body 42 and the base 1. When the frame 2 makes a downward pressing movement, the first cover body 41 moves downward synchronously with the frame 2, and the second cover body 42 swings upward relative to the first cover body 41. When the frame 2 makes an upward tilting movement, the first cover body 41 moves upward synchronously with the frame 2, and the second cover body 42 swings downward relative to the first cover body 41. The first cover body 41 swings between a first position and a second position relative to the frame 2. When the first cover body 41 is in the first position, the first cover body 41 is in limit cooperation with the second cover body 42 to limit the upward swing of the second cover body 42, and the lower end of the second cover body 42 abuts against the rear protective cover 5. When the first cover body 41 is in the second position, the first cover body 41 is in misaligned cooperation with the second cover body 42 to release the limit on the second cover body 42. An elastic locking mechanism 6 is provided between the frame 2 and the first cover body 41, and the elastic locking mechanism 6 makes the first cover body 41 always have a tendency to move towards the first position. One end of the linkage rod 7 is eccentrically hinged to the second cover body 42, and the other end of the linkage rod 7 is hinged to the base 1. The linkage rod 7 is provided with a kidney-shaped hole 71, and the linkage rod 7 is hinged to the base 1 through the kidney-shaped hole 71. A torsion spring 8 is provided between the second cover body 42 and the frame 2, and the torsion spring 8 makes the second cover body 42 always have a tendency to swing downward relative to the frame 2. When the frame 2 makes a downward pressing movement, the second cover body 42 swings upward relative to the first cover body 41 under the action of the linkage rod 7. When the frame 2 makes an upward tilting movement, the second cover body 42 swings downward relative to the first cover body 41 under the action of the torsion spring 8.

[0030] Based on the above embodiments, the present invention provides a compound saw with a saw blade protection device, wherein the outer peripheral cover of the saw blade 3 is provided with a front protective cover 4 and a rear protective cover 5, the rear protective cover 5 is fixedly connected to the base 1, the front protective cover 4 includes a first cover body 41 and a second cover body 42 which are separately arranged, the second cover body 42 is located between the first cover body 41 and the rear protective cover 5, the upper end of the first cover body 41 and the center of the second cover body 42 are respectively hinged to the frame 2; the first cover body 41 swings between a first position and a second position relative to the frame 2, when the first cover body 41 is located at the first position, the first cover body 41 and the second cover body 42 are limitedly matched to limit the second cover body 42 from swinging upward, and the lower end of the second cover body 42 is abutted against the rear protective cover 5; when the first cover body 41 is located at the second position, the first cover body 41 and the second cover body 42 are staggeredly matched to release the limitation on the second cover body 42. The rear protective cover 5 of the present invention is fixedly connected to the base 1. When the frame 2 is pressed down, the second cover body 42 swings upward relative to the first cover body 41 under the action of the linkage rod 7. When the frame 2 is tilted upward, the second cover body 42 swings downward relative to the first cover body 41 under the action of the torsion spring 8. This realizes a highly simplified linkage structure of the protective device, abandons redundant components and cumbersome connection methods in traditional complex linkage structures, and effectively reduces material, processing and assembly costs. At the same time, the streamlined structure reduces the probability of mechanical failure, ensuring that it can still maintain a stable and accurate operating state in long-term high-frequency use scenarios, and has both economy and reliability.

[0031] In this embodiment, if Figure 3 As shown, a linkage rod 7 is provided between the second cover body 42 and the base 1. Specifically, the base 1 is provided with a base bracket 11, one end of the linkage rod 7 is hinged to the second cover body 42, and the other end of the linkage rod 7 is hinged to the base bracket 11. When the frame 2 is tilted upward or pressed downward, the second cover body 42 is driven by the linkage rod 7 to swing downward or upward relative to the first cover body 41.

[0032] In a further preferred embodiment, a kidney-shaped hole 71 is provided on the linkage rod 7, and a screw rod 72 is arranged in the kidney-shaped hole 71. The screw rod 72 passes through the kidney-shaped hole 71 and is fixedly connected to the base bracket 11. The provision of the kidney-shaped hole 71 enables the second cover body 42 to be manually swung upward and downward, facilitating the replacement of the saw blade 3. In this embodiment, due to the provision of the kidney-shaped hole 71, when the frame 2 makes an upward tilting movement, the linkage rod 7 cannot drive the second cover body 42 to swing downward. Therefore, a torsion spring 8 is provided between the second cover body 42 and the frame 2. A first hook 81 is provided at the first end of the torsion spring 8, and the second cover body 42 is provided with a first insertion hole 424 for plugging and cooperating with the first hook 81; a second hook 82 is provided at the second end of the torsion spring 8, and the frame 2 is provided with a second insertion hole 22 for plugging and cooperating with the second hook 82. When the frame 2 tilts upward, the second cover body 42 swings downward under the elastic force of the torsion spring 8; when the frame 2 is pressed downward, the second cover body 42 swings upward under the drive of the linkage rod 7 against the elastic force of the torsion spring 8.

[0033] In a further preferred embodiment, a first hinge hole 414 is provided at the upper end of the first cover body 41. The first cover body 41 swings between a first position and a second position relative to the frame 2 with the first hinge hole 414 as the first hinge point; a second hinge hole 423 is provided at the center of the second cover body 42. The second cover body 42 swings upward and downward relative to the first cover body 41 with the second hinge hole 423 as the second hinge point. As Figure 1 and Figure 3 shown, during installation, a first screw is inserted into the first hinge hole 414, and the first screw provides a fulcrum for the rotation of the first cover body 41; a second screw is inserted into the second hinge hole 423, and the second screw provides a fulcrum for the rotation of the second cover body 42.

[0034] As another preferred solution of the present invention, when the first cover body 41 is in the first position, the lower end of the first cover body 41 abuts and cooperates with the upper edge of the second cover body 42; when the first cover body 41 is in the second position, the second cover body 42 covers the outside of the first cover body 41. A first convex block 411 for abutting and cooperating with the upper edge of the second cover body 42 is provided at the lower end of the first cover body 41. The front protective cover 4 includes a first cover body 41 and a second cover body 42 which are separately arranged. When the first cover body 41 is in the first position, the lower end of the first cover body 41 is in limit cooperation with the upper edge of the second cover body 42, so that the front protective cover 4 as a whole has a larger arc length (i.e., a larger central angle), and the first cover body 41, the second cover body 42 and the rear protective cover 5 are connected in sequence. Furthermore, the front protective cover 4 and the rear protective cover 5 cooperate to shield all the cutting edges of the saw blade 3, as Figure 4As shown in the figure; when the first cover 41 is in the second position, the first cover 41 is misaligned with the second cover 42 to release the limit on the second cover 42. The second cover 42 swings upward as the frame 2 is pressed downward and covers the outside of the first cover 41. At this time, a cutting area for the cutting edge of the saw blade 3 to expose is formed between the end of the second cover 42 and the rear protective cover 5, so that the front protective cover 4 as a whole has a smaller arc length (i.e., a smaller central angle), and further, the lower end thereof will not interfere with the workpiece to be cut, such as Figure 2 and Figure 6 shown in the figure.

[0035] In this embodiment, when the first cover 41 is in the first position, the first cover 41 realizes the limit cooperation with the second cover 42 through the first convex block 411. In a further embodiment, a convex rib 421 is provided at the upper end of the second cover 42, and a card slot 422 is formed between every two adjacent convex ribs 421; a second convex block 413 is provided at the lower end of the first cover 41, and a clamping block 4131 is provided on the second convex block 413, and the clamping block 4131 is in clamping cooperation with the card slot 422; a first inclined surface 4211 is provided on the convex rib 421, and a second inclined surface 4132 is provided on the second convex block 413, and the first inclined surface 4211 abuts against the second inclined surface 4132. As shown in Figure 4 、 Figure 9 and Figure 10 shown in the figure, when the lower end of the first cover 41 abuts against the upper end of the second cover 42, that is, when the first convex block 411 of the first cover 41 abuts against the upper edge of the second cover 42, the clamping block 4131 of the second convex block 413 is inserted into the card slot 422, and the first inclined surface 4211 of the convex rib 421 abuts against the second inclined surface 4132 of the second convex block 413, thereby improving the stability of the connection between the first cover 41 and the second cover 42, so that the first cover 41 stably and reliably limits the second cover 42.

[0036] As another preferred solution of the present invention, the elastic locking mechanism 6 includes a transmission rod 61 and a compression spring 62. The transmission rod 61 is fixedly connected to the first cover 41, and the compression spring 62 is abutted between the frame 2 and the first cover 41, so that the first cover 41 always has a tendency to move towards the first position. The first cover 41 is provided with a first stop block 412, and the frame 2 is provided with a second stop block 21 corresponding to and cooperating with the first stop block 412. The transmission rod 61 and the compression spring 62 are sequentially arranged between the first stop block 412 and the second stop block 21. The transmission rod 61 is fixedly connected to the first stop block 412 through a bolt 63, and the compression spring 62 is sleeved on the outer periphery of the bolt 63. In this embodiment, as shown in Figure 7As shown, the first cover body 41 is provided with a first stop block 412, the frame 2 is provided with a second stop block 21 corresponding to and cooperating with the first stop block 412, and the transmission rod 61 and the compression spring 62 are sequentially arranged between the first stop block 412 and the second stop block 21. The transmission rod 61 is fixedly connected to the first stop block 412 through a bolt 63, and the compression spring 62 is sleeved on the outer periphery of the bolt 63. The first stop block 412 is provided with a stop edge 4121 for restricting the rotation of the transmission rod 61. In this embodiment, as Figure 7 and Figure 8 shown, a square hole 23 is formed in the frame 2, the second stop block 21 is located on one side of the square hole 23, the first stop block 412 extends out of the square hole 23 and is located on the other side of the square hole 23, so that the first stop block 412 and the second stop block 21 are arranged facing each other, and the transmission rod 61 is fixedly connected to the first stop block 412. When pressure is applied to the transmission rod 61, the first stop block 412 is accordingly subjected to pressure, causing the first stop block 412 to move in the direction close to the second stop block 21, that is, causing the first cover body 41 to move in the direction away from the second cover body 42 until the first convex block 411 is disengaged from the upper edge of the second cover body 42, thereby releasing the limit of the first cover body 41 on the second cover body 42. When the pressure on the transmission rod 61 is released, the first stop block 412 and the transmission rod 61 move in the direction away from the second stop block 21 under the elastic force of the compression spring 62, that is, causing the first cover body 41 to move in the direction close to the second cover body 42. When the second cover body 42 swings downward until its upper edge is aligned with the first convex block 411 of the first cover body 41, the first convex block 411 automatically abuts against the upper edge of the second cover body 42 to realize the limit of the first cover body 41 on the second cover body 42. In this embodiment, the first stop block 412 is provided with a stop edge 4121. When the transmission rod 61 is fixedly connected to the first stop block 412, the stop edge 4121 limits the transmission rod 61 to restrict the rotation of the transmission rod 61.

[0037] As another preferred solution of the present invention, the rear protective cover 5 is provided with a supporting portion 51 that abuts against the lower end of the second cover body 42. In this embodiment, as Figure 5 and Figure 11 shown, when the first cover body 41 is in the first position, the upper end of the second cover body 42 abuts against the lower end of the first cover body 41 through the first convex block 411, and the lower end of the second cover body 42 abuts against the rear protective cover 5 through the supporting portion 51, so that the fitting connection between the second cover body 42, the first cover body 41 and the rear protective cover 5 is reliable and stable. In a further preferred embodiment, the rear protective cover 5 includes a first guard plate 52 and a second guard plate 53, and the first guard plate 52 and the second guard plate 53 cooperate to form a receiving cavity 54 for accommodating the rear edge of the blade of the saw blade 3.

[0038] As another preferred embodiment of the present invention, it further includes a movable platen 9 and a follower guard 10, and the follower guard 10 is fixedly connected to the lower end surface of the movable platen 9. The follower guard 10 has a third position and a fourth position relative to the saw blade 3. When the follower guard 10 is in the third position, the follower guard 10 shields the cutting edge at the upper end of the saw blade 3, and the cutting edge at the lower end of the saw blade 3 extends out of the follower guard 10; when the follower guard 10 is in the fourth position, the follower guard 10 shields the cutting edge at the lower end of the saw blade 3, and the cutting edge at the upper end of the saw blade 3 extends out of the follower guard 10. In this embodiment, as Figure 12 shown, the follower guard 10 adopts an extended design, so that the protection range of the follower guard 10 is larger, and thus, no matter whether the compound saw is in the table cutting working state or in the miter cutting working state, the follower guard 10 can effectively protect the cutting edge of the saw blade 3. As Figure 1 and Figure 12 shown, when the compound saw is in the miter cutting working state, that is, when the follower guard 10 is in the third position, the follower guard 10 shields the cutting edge at the upper end of the saw blade 3. At this time, the movable platen 9 is arranged at an angle relative to the base 1; as Figure 13 and Figure 16 shown, when the compound saw is in the table cutting working state, that is, when the follower guard 10 is in the fourth position, the follower guard 10 shields the cutting edge at the lower end of the saw blade 3. At this time, the movable platen 9 is arranged parallel to the base 1. In this embodiment, the follower guard 10 is fixedly connected to the lower end surface of the movable platen 9. When adjusting the installation height of the movable platen 9, the follower guard 10 moves up and down with the movable platen 9, thereby realizing the synchronous adjustment of the working position of the movable platen 9; when the movable platen 9 is locked, the position of the follower guard 10 is locked accordingly, making the adjustment of the follower guard 10 simple and the operation convenient.

[0039] In a further preferred embodiment, the upper end of the follower guard 10 is provided with a connecting portion 101 bent outward, and the follower guard 10 is detachably and fixedly connected to the movable platen 9 through the connecting portion 101. In this embodiment, as Figure 14 and Figure 15 shown, the follower guard 10 is detachably connected to the movable platen 9 through the connecting portion 101, which is convenient for the processing and assembly of the follower guard 10, and is also convenient for the subsequent maintenance and replacement of the follower guard 10. The connecting portion 101 is bent, which increases the stability of the installation of the follower guard 10 relative to the movable platen 9 and reduces the shaking of the follower guard 10.

[0040] In a further preferred embodiment, the follower guard 10 includes a first cover plate 104 and a second cover plate 105, and an accommodation space 102 for accommodating the saw blade 3 is formed between the first cover plate 104 and the second cover plate 105. First limiting portions 1041 bent inward are provided on both sides of the first cover plate 104, and second limiting portions 1051 bent inward are provided on both sides of the second cover plate 105, and the first limiting portions 1041 and the second limiting portions 1051 are correspondingly matched. In this embodiment, as Figure 14 and Figure 15 shown, the first limiting portions 1041 and the second limiting portions 1051 are correspondingly matched to limit the relative distance between the first cover plate 104 and the second cover plate 105, thereby limiting the width of the accommodation space 102 and reducing the shaking of the first cover plate 104 and the second cover plate 105 during operation.

[0041] In a further preferred embodiment, a relief groove 1052 for the output shaft of the driver of the composite saw to pass through is formed in the second cover plate 105, and the relief groove 1052 can make way for the output shaft of the driver when the follower guard 10 moves up and down relative to the saw blade 3. A sealing strip 1053 is provided at the opening of the relief groove 1052, and the sealing strip 1053 is detachably connected to the second cover plate 105. In this embodiment, as Figure 15 shown, the relief groove 1052 is provided for the output shaft of the driver of the composite saw to pass through the second cover plate 105 and move up and down relative to the second cover plate 105. The sealing strip 1053 can prevent the areas on both sides of the relief groove 1052 of the second cover plate 105 from deforming and rubbing against the saw blade 3, improving the safety of using the follower guard 10 and reducing the shaking of the second cover plate 105 during the operation of the composite saw. In this embodiment, the driver is a motor, the output shaft of the driver is the output shaft of the motor, the saw blade 3 is fixedly installed on the output shaft of the motor, and when the motor drives its output shaft to rotate, the saw blade 3 is driven to rotate synchronously.

[0042] In a further preferred embodiment, an avoidance hole 1042 is formed in the first cover plate 104, and the avoidance hole 1042 includes a strip-shaped hole 1043 and a circular hole 1044, and the strip-shaped hole 1043 and the circular hole 1044 are arranged in sequence from top to bottom and are communicated with each other. In this embodiment, as Figure 15 shown, the strip-shaped hole 1043 is provided for the output shaft of the driver of the composite saw to pass through and move up and down, and the circular hole 1044 is convenient for the disassembly of the saw blade 3, and the parts such as the retaining plate and nut for fixing the saw blade 3 are disassembled and assembled through the circular hole 1044.

[0043] In a further preferred embodiment, a cut-off corner structure 103 is provided at the corner of the lower end of the follower guard 10. In this embodiment, asFigure 12 and Figure 14 As shown in Figure 14 , the setting of the chamfered structure 103 enables, when the follower guard 10 is in the third position, i.e., when the compound saw is in the miter cutting mode, to make as many cutting edges of the saw blade 3 contact the workpiece to be cut during the cutting operation, thereby improving the cutting efficiency.

[0044] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A compound saw with a saw blade protection device, comprising a base, a frame and a head assembly. The head assembly has a saw blade accommodated in the frame and partially exposed outside the frame, and is characterized in that: The outer periphery of the saw blade is provided with a front protective cover and a rear protective cover. The rear protective cover is fixedly connected to the base. The front protective cover includes a first cover body and a second cover body which are separately arranged. The second cover body is located between the first cover body and the rear protective cover. The upper end of the first cover body and the center of the second cover body are respectively hinged to the frame. A linkage rod is hinged between the second cover body and the base. When the frame makes a downward pressing action, the first cover body moves downward synchronously with the frame, and the second cover body swings upward relative to the first cover body. When the frame makes an upward tilting action, the first cover body moves upward synchronously with the frame, and the second cover body swings downward relative to the first cover body. The first cover body swings between a first position and a second position relative to the frame. When the first cover body is in the first position, the first cover body is in limit fit with the second cover body to limit the upward swing of the second cover body, and the lower end of the second cover body abuts against the rear protective cover. When the first cover body is in the second position, the first cover body is in misaligned fit with the second cover body to release the limit on the second cover body. An elastic locking mechanism is arranged between the frame and the first cover body, and the elastic locking mechanism makes the first cover body always have a tendency to move towards the first position.

2. The composite saw with a band saw blade protection device according to claim 1, characterized in that: One end of the linkage rod is eccentrically hinged to the second cover body, and the other end of the linkage rod is hinged to the base.

3. The composite saw with a band saw blade protection device according to claim 1 or 2, characterized in that: The linkage rod is provided with an oval hole, and the linkage rod is hinged to the base through the oval hole. A torsion spring is arranged between the second cover body and the frame, and the torsion spring makes the second cover body always have a tendency to swing downward relative to the frame. When the frame makes a downward pressing action, the second cover body swings upward relative to the first cover body under the action of the linkage rod. When the frame makes an upward tilting action, the second cover body swings downward relative to the first cover body under the action of the torsion spring.

4. The composite saw with a band saw blade protection device according to claim 1, characterized in that: When the first cover body is in the first position, the lower end of the first cover body abuts against the upper edge of the second cover body, and the lower end of the first cover body is provided with a first convex block which abuts against the upper edge of the second cover body. When the first cover body is in the second position, the second cover body covers the outside of the first cover body.

5. The composite saw with a band saw blade protection device according to claim 1, characterized in that: The elastic locking mechanism includes a transmission rod and a compression spring. The transmission rod is fixedly connected to the first cover body, and the compression spring is abutted between the frame and the first cover body to make the first cover body always have a tendency to move towards the first position.

6. The composite saw with a band saw blade protection device according to claim 5, characterized in that: The first cover body is provided with a first stop block, and the frame is provided with a second stop block corresponding to and cooperating with the first stop block. The transmission rod and the compression spring are sequentially arranged between the first stop block and the second stop block.

7. The composite saw with a band saw blade protection device according to claim 6, characterized in that: The transmission rod is fixedly connected to the first stop block through a bolt, and the compression spring is sleeved on the outer periphery of the bolt.

8. The composite saw with a band saw blade protection device according to claim 1, characterized in that: The rear protective cover is provided with a supporting portion which abuts against the lower end of the second cover body.

9. The composite saw with a band saw blade protection device according to claim 1, characterized in that: It further includes a movable table board and a follow-up protective cover, and the follow-up protective cover is fixedly connected to the lower end face of the movable table board.

10. The composite saw with a band saw blade protection device according to claim 9, characterized in that: The follower guard has a third position and a fourth position relative to the saw blade. When the follower guard is in the third position, the follower guard shields the cutting edge at the upper end of the saw blade, and the cutting edge at the lower end of the saw blade extends out of the follower guard; when the follower guard is in the fourth position, the follower guard shields the cutting edge at the lower end of the saw blade, and the cutting edge at the upper end of the saw blade extends out of the follower guard.

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