Saw tools with liftable saw blade guard

Abstract

This invention discloses a sawing machine tool with a liftable saw blade guard, comprising a machine tool body, a saw blade guard, a guide mechanism, and a covering element. The machine tool body has a worktable, a processing module, and a swing arm pivotally connecting the worktable and the processing module. The saw blade guard has a fixed guard, a movable guard, and an elastic element, with both ends of the elastic element respectively disposed on the fixed guard and the movable guard. One end of the guide mechanism has a first guide groove, which is connected to the movable guard of the machine tool body. The covering element is disposed on both the fixed guard and the movable guard of the saw blade guard, and is driven when the movable guard moves along the first guide groove of the guide mechanism. Therefore, when the processing module flips downward relative to the swing arm, the movable guard can automatically flip upward through the elastic element.

Description

[Technical Field]

[0001] This invention relates to a sawing machine tool, and more particularly to a sawing machine tool with a liftable saw blade guard. When the user performs sawing operations, the saw blade guard will automatically lift up, exposing part of the saw blade to cut the workpiece. When the user needs to replace the saw blade, the user lifts the saw blade guard. Through the relative movement between the saw blade guard and the guide mechanism, the covering element does not obstruct the element used to fix the saw blade, so that the user can directly replace the saw blade. [Previous Technology]

[0002] Note: Sawing machines are widely used power tools. Depending on the rotation speed and the saw blade, they can be used to cut stone, tiles, wood, or metal materials. Currently, there are also portable handheld circular saws or cutting machines available, allowing users to process materials directly on-site. In order to cut hard materials, the saw blades of sawing machines are quite sharp. Therefore, when not in use, the saw blades need to be protected with a saw blade guard to prevent users from being accidentally cut by the saw blade.

[0003] In actual sawing operations, the user needs to hold the handle with one hand and open the saw blade guard with the other hand to expose the saw blade to contact the workpiece, maintaining this posture while sawing. However, because the user operates with only one hand during the sawing process, it is easy to cause danger. Furthermore, in order to increase the safety of sawing machines, the design of the saw blade guard is important. Currently, saw blade guards can completely protect the saw blade to prevent accidental contact by the user. However, because the structural design of the saw blade guard is becoming more and more complex, the operation of replacing the saw blade has become more cumbersome, requiring a lot of time to complete the replacement, resulting in reduced work efficiency.

[0004] Chinese Patent Publication No. 220073431 U discloses a metal cutting machine with convenient blade replacement. It has a first protective shell and a second protective shell, which are secured by a clamping plate within L-shaped slots in the first guide plate of the first protective shell and the second guide plate of the second protective shell. The clamping plate locks the first and second protective shells tightly together. By adjusting the screw to rotate the clamping plate, the first and second protective shells can be released, allowing the user to remove the second protective shell and replace the saw blade. However, this saw blade guard design requires changes to its shape, resulting in higher manufacturing costs. Furthermore, during machine operation, vibrations may cause the screw to loosen, affecting the fixation of the first and second protective shells and potentially causing danger to the user.

[0005] Therefore, the inventor has been thinking about how to provide a sawing machine that can automatically raise the saw blade guard and has a structure that makes it easy for the user to replace the saw blade. [Summary of the Invention]

[0006] In view of the many shortcomings of the existing sawing machine tools, the main objective of the present invention is to provide a sawing machine tool with a liftable saw blade guard, which can automatically flip the saw blade guard when performing sawing operations. When the saw blade needs to be replaced, the saw blade guard exposes the spindle screw that fixes the saw blade through a linkage mechanism, which has the advantage of quick saw blade replacement.

[0007] To achieve the above-mentioned main objectives, the present invention provides a sawing machine tool, comprising a machine tool body, a saw blade guard, a guiding mechanism, and a covering element. The machine tool body has a worktable, a processing module, and a swing arm pivotally connecting the worktable and the processing module. The saw blade guard is disposed on the processing module of the machine tool body, and has a fixed guard, a movable guard, and an elastic element. Both ends of the elastic element are respectively disposed on the fixed guard and the movable guard. When the processing module flips downward relative to the swing arm, the movable guard flips upward relative to the fixed guard through the elastic element. The guiding mechanism is disposed on the movable guard of the saw blade guard, and one end of the guiding mechanism has a first guide groove, which is connected to the movable guard of the saw blade guard. The covering element is disposed on the fixed guard and the movable guard of the saw blade guard, and is driven when the movable guard of the saw blade guard deflects along the first guide groove of the guiding mechanism relative to the fixed guard.

[0008] By means of the above technical features, when the sawing operation is performed, the processing module will tilt downward relative to the swing arm to approach the workpiece. As the processing module moves, the movable cover of the saw blade guard will simultaneously tilt upward due to the tension of the elastic element, so as to smoothly saw the workpiece. Furthermore, when the user manually lifts the movable cover, force needs to be applied to resist the tension of the elastic element. When a certain force is reached, the movable cover can be opened and the covering element will be deflected, making it easier for the user to maintain the processing module.

[0009] Preferably, the machining module of the machine tool body includes a housing, a motor disposed within the housing, a saw blade connected to the motor via a spindle screw, and a handle fixed to the housing. Thus, the machining module is operated by the user holding the handle to perform sawing operations, and the spindle screw is concealed by a cover element, only exposed for disassembly when the saw blade needs to be replaced.

[0010] Preferably, one end of the swing arm of the machine tool body is pivotally connected to the worktable via a lower pivot, and the other end is pivotally connected to the machining module and the guide mechanism via an upper pivot. In this way, the swing arm can drive the machining module to move forward or backward via the lower pivot, and the machining module can be deflected downward relative to the swing arm via the upper pivot to perform sawing operations.

[0011] Preferably, the guide mechanism is connected to the movable cover of the saw blade guard by a pin passing through the first guide groove. In this way, the guide mechanism can drive the processing module, allowing the processing module to make fine adjustments to its angle due to the movement of the guide mechanism, and the movable cover can be displaced along the first guide groove, so that the movable cover can be completely flipped over the fixed cover, allowing the user to focus on changing the saw blade.

[0012] Preferably, the guiding mechanism also has a second guide groove, through which the guiding mechanism is connected to the machining module of the machine tool body via a pin, so that the machining module rotates downward relative to the swing arm along the second guide groove. In this way, when the machining module performs a sawing operation, the second guide groove can restrict the downward rotation path of the machining module, thereby improving the accuracy of the cutting position.

[0013] Preferably, the other end of the guiding mechanism is fixed to the worktable of the machine tool body. In this way, the guiding mechanism can not only be firmly fixed to the worktable, but also the machining module can be easily adjusted to the ideal position by driving the machining module through the other end of the guiding mechanism.

[0014] Preferably, the fixed cover of the saw blade guard has a connecting plate and a third guide groove formed in the connecting plate. The covering element passes through the third guide groove and abuts against the inner side of the movable cover. When the covering element is moved, it moves along the third guide groove, and the connecting plate is used to fix one end of the elastic member. In this way, the covering element is moved by the structure of the inner side plate of the movable cover, and when it moves, the spindle screw that was originally covered can be exposed.

[0015] Preferably, the inner side of the movable guard of the saw blade guard has a connecting portion, a connecting hole disposed in the center of the connecting portion, and at least one pushing portion formed in the connecting portion. The movable guard is pivotally connected to the fixed guard through a pin passing through the connecting hole. The pushing portion abuts against the covering element, and the connecting portion is one end of the fixed elastic member. In this way, the movable guard can rotate relative to the fixed guard through the pin, and the tension of the elastic member can provide the movable guard with the force to automatically lift and reset.

[0016] Preferably, the elastic element of the saw blade guard is a torsion spring. In this way, when the fixed guard flips downward, the elastic element connected to one end of the fixed guard will convert its force into a torsional force and transmit it to the end of the elastic element connected to the movable guard, causing the movable guard to flip.

[0017] Preferably, the cover element has a protrusion and a connecting hole through both sides of the cover element. The cover element passes through the protrusion into the fixed cover of the saw blade guard to abut against the inner side of the movable cover. The cover element passes through the connecting hole via a pin to connect to the fixed cover. In this way, the cover element can be movably disposed on the fixed cover and the movable cover to cover or not cover the spindle screw of the machining module.

[0018] The detailed structure, features, assembly, and usage of the sawing machine provided by the present invention will be described in the following detailed description of the embodiments. However, those skilled in the art should understand that such detailed descriptions and the specific embodiments listed for implementing the present invention are merely illustrative and not intended to limit the scope of the patent application.

Implementation Method

[0019] The applicant first clarifies that in the embodiments and drawings described below, the same reference numerals denote the same or similar elements or their structural features. It should be noted that the elements and structures in the drawings are for illustrative purposes and are not drawn according to actual scale and quantity; and features of different embodiments can be used interchangeably if feasible in practice. Secondly, when it is stated that an element is disposed on another element, it means that the aforementioned element is directly disposed on the other element, or that the aforementioned element is indirectly disposed on the other element; that is, one or more other elements are disposed between the two elements. Conversely, when it is stated that an element is "directly" disposed on another element, it means that no other elements are disposed between the two elements.

[0020] Please refer to Figures 1 to 6. The sawing machine 10 of the present invention mainly includes a machine body 20, a saw blade guard 30, a guide mechanism 40 and a cover element 50.

[0021] The machine tool body 20 has a worktable 21, a machining module 22, and a swing arm 23. The swing arm 23 has an H-shaped structure. Its bottom end is pivotally connected to the worktable 21 through a lower pivot 231, and its top end is pivotally connected to the machining module 22 through an upper pivot 232. The machining module 22 includes a housing 221, a motor 222 disposed in the housing 221, a saw blade 224 connected to the motor 222 through a spindle screw 223, and a handle 225 fixed to the housing 221.

[0022] The saw blade guard 30 has a fixed guard 31, a movable guard 32 and an elastic member 33. The two ends of the elastic member 33 are respectively set on the fixed guard 31 and the movable guard 32. When no processing operation is performed, the fixed guard 31 and the movable guard 32 together cover the saw blade 224 to prevent the user from accidentally touching the saw blade 224 and getting injured. When processing operation is performed, the processing module 22 will flip downward relative to the swing arm 23, and the movable guard 32 will flip upward through the tension of the elastic member 33, while the fixed guard 31 remains stationary. The fixed cover 31 also has a connecting plate 311 and a third guide groove 312 formed on the connecting plate 311. The connecting plate 311 is fixed to the fixed cover 31 through two pins 313, and the fixed cover 31 is fixed to the housing 221 of the processing module 22. The inner side of the movable cover 32 also has a connecting part 321, a connecting hole 322 provided in the center of the connecting part 321, and at least one pushing part 323 formed on the connecting part 321. The movable cover 32 is pivotally connected to the connecting plate 311 of the fixed cover 31 through a pin 34 passing through the connecting hole 322. The elastic element 33 is a torsion spring, one end of which is fixed to the connecting plate 311 of the fixed cover 31, and the other end is fixed to the connecting part 321 of the movable cover 32.

[0023] The guiding mechanism 40 is a combination of multiple links, which is pivotally connected to one side of the movable guard 32 of the saw blade guard 30. The guiding mechanism 40 has a first link 41, a second link 42, a third link 43 and a fourth link 44. One end of the first link 41 has a first guide groove 411, which is elongated. The first link 41 passes through the first guide groove 411 through a pin 45 to connect to the movable guard 32. The other end of the first link 41 is pivotally connected to the second link 42. The end of the second connecting rod 42 not connected to the first connecting rod 41 has a second guide groove 421, which is arc-shaped. The second connecting rod 42 passes through the second guide groove 421 via a pin 46 to connect to the housing 221 of the machining module 22 of the machine tool body 20. One end of the swing arm 23 of the machine tool body 20 is also pivotally connected to the two ends of the second connecting rod 42 via a pivot 232. One end of the third connecting rod 43 is pivotally connected to the two ends of the second connecting rod 42. This connection position is adjacent to the connection position between the second connecting rod 42 and the swing arm 23. The third connecting rod 43 is parallel to the swing arm 23. The other end of the third connecting rod 43 is pivotally connected to the fourth connecting rod 44. The end of the fourth connecting rod 44 not connected to the third connecting rod 43 is fixed to the worktable 21 of the machine tool body 20. The bottom end of the fourth connecting rod 44 is locked to the worktable 21 by a screw 47.

[0024] The relative positions of the swing arm 23 and the second link 42, the third link 43 and the fourth link 44 of the guide mechanism 40 will form a quadrilateral shape. Through the movement of the guide mechanism 40, multiple position combinations of angles can be matched, so that the processing module 22 can be adjusted to multiple positions.

[0025] The cover element 50 has a protrusion 51 and a connecting hole 52 that passes through both sides of the cover element 50. The protrusion 51 of the cover element 50 passes through the third guide groove 312 from one side of the fixed cover 31 of the saw blade cover 30 and abuts against the push part 323 on the inner side of the movable cover 32. Then, through a pin 53, the third guide groove 312 and the connecting hole 52 pass through the other side of the fixed cover 31 of the saw blade cover 30, so that the cover element 50 can be movably set on the fixed cover 31 and just covers the spindle screw 223 of the processing module 22, preventing the spindle screw 223 from being disassembled at will. When the movable cover 32 moves along the first guide groove 411, it will drive the cover element 50 to deflect, and the spindle screw 223 will be exposed at this time.

[0026] The sawing machine 10 of the present invention further includes a locking mechanism 60, which is connected to the swing arm 23 of the machine body 20 to limit the position of the swing arm 23 of the machine body 20. The locking mechanism 60 has a fixing plate 61 and a positioning member 62. The bottom end of the fixing plate 61 is fixed to the worktable 21 of the machine body 20 with screws 63, and the top end has a positioning groove 611 and a plurality of positioning holes 612 formed in the positioning groove 611. The positioning member 62 has a positioning button 621 that passes through the positioning groove 611 and the swing arm 23 of the machine body 20, a positioning spring 622 fixed to the positioning button 621, and a positioning ring 623 that sets the front end of the positioning button 621 and the positioning spring 622. The front end is designed as a tapered flange. The positioning button 621 passes through the positioning groove 611 and is fixed to the swing arm 23 of the machine tool body 20, so that the front end of the positioning ring 623 can be engaged in the positioning hole 612. The position of the positioning member 62 is fixed in the positioning groove 611 to limit the position of the swing arm 23 of the machine tool body 20. When the positioning ring 623 of the positioning member 62 is pulled, the front end of the positioning ring 623 can be separated from the positioning hole 612 through the positioning spring 622, so that the swing arm 23 can be displaced along the positioning groove 611 through the positioning member 62.

[0027] Please also refer to Figure 7, which is a schematic diagram of the sawing operation. The workpiece is placed on the workbench 21 and clamped and fixed. The user first adjusts the position and angle of the processing module 22 according to the edge position of the workpiece, and then starts the motor 222 of the processing module 22. The saw blade 224 starts to rotate due to the drive of the motor 222. At this time, the user holds the handle 225 and applies force to press down. The first connecting rod 41 of the guide mechanism 40 is driven to deflect downward. The position of the swing arm 23 is restricted by the locking mechanism 60. Therefore, the processing module 22 rotates through the upper rotating shaft 232, while the swing arm 23 remains stationary. The processing module 22 rotates downward along the shape of the second guide groove 421 of the second connecting rod 42, so that the processing module 22 performs sawing operation through the designed path to accurately cut the workpiece.

[0028] During the downward flipping of the processing module 22, the fixed cover 31 of the saw blade cover 30 fixed on the housing 221 will be driven downward at the same time. The elastic element 33 fixed to one end of the fixed cover 31 will be subjected to the downward rotation force and generate torsion. The torsion force will be transmitted to the movable cover 32. The movable cover 32 can rotate clockwise with the pin 45 pivotally connected to the first connecting rod 41 and the pin 34 pivotally connected to the connecting plate 311 as fulcrums, thereby achieving the function of automatic lifting. In this way, when the saw blade 224 approaches the workpiece, the saw blade 224 will be exposed to contact the workpiece.

[0029] Please refer to Figures 8 to 10 for an explanation of replacing the saw blade 224. Figure 8 shows the cover element 50 with the movable cover 32 hidden. Figure 9 is a view of the inner side of the movable cover 32. The fixed cover 31 is hidden to clearly show the relative relationship between the cover element 50 and the movable cover 32.

[0030] First, the user manually raises the movable cover 32 of the saw blade guard 30 to a certain position (similar to the position where the movable cover 32 automatically rises during sawing operations). Then, the user continues to apply force to flip the movable cover 32 upwards and move it backwards simultaneously. At this time, the user's force will exceed the original preset elastic force of the elastic member 33, causing the elastic member 33 to push the movable cover 32 above the fixed cover 31, allowing the movable cover 32 to begin to be moved backwards. 2. When the device moves backward, the pin 45 of the first connecting rod 41 that connects the movable cover 32 and the guide mechanism 40 will move from one end of the first guide groove 411 to the other end. At this time, the protrusion 51 of the cover element 50 is pushed by the push part 323 of the movable cover 32, and the cover element 50 moves along the third guide groove 312 of the fixed cover 31 through the pin 53 (as shown in Figure 10), so that the spindle screw 223 is exposed. The user can then remove the spindle screw 223 with tools and replace the saw blade 224.

[0031] Please refer to Figures 1 and 11 to 14 again. The present invention can adjust the angle of the processing module 22 through the swing arm 23, the guide mechanism 40 and the locking mechanism 60 to adjust the saw blade 224 to the optimal cutting position. This embodiment provides three implementation states, showing the angle at which the processing module 22 of the machine tool body 20 is positioned when the locking mechanism 60 is in three locking positions.

[0032] When the locking mechanism 60 is in the first position P1, the positioning member 62 is located in the positioning hole 612 in the middle of the positioning groove 611 of the fixed plate 61, and the swing arm 23 of the machine tool body 20 and the third connecting rod 43 are perpendicular to the ground. Thus, the processing module 22 pivotally connected to the top of the swing arm 23 is in a slightly forward tilted state.

[0033] To adjust the processing module 22 from the first position P1 to the second position P2 or the third position P3, the user must pull the positioning ring 623 of the positioning member 62 outward. A positioning spring 622 is installed inside the positioning ring 623, and one end of the positioning spring 622 is fixed to the positioning button 621. When the positioning ring 623 is pulled outward, it resists the tension of the positioning spring 622, causing the positioning spring 622 to compress with the end fixed to the positioning button 621 as a fulcrum. The front end of the positioning ring 623 can then separate from the positioning hole 612. At this time, the positioning member 62... The swing arm 23 and guide mechanism 40 are movable and can slide along the positioning groove 611, allowing the user to hold the handle 225 of the processing module 22 and the housing 221 to adjust the position. As the position of the processing module 22 changes, the swing arm 23 will move forward or backward along the positioning groove 611, simultaneously driving the guide mechanism 40 to move. Since the second link 42 is pivotally connected to the swing arm 23, the processing module 22 can also produce a slight upward or downward movement through the design of the second link 42 pivoting relative to the swing arm 23, allowing the saw blade 224 to be finely adjusted to a suitable position. When the adjustment is completed, the positioning member 62 will correspond exactly to the position of the positioning hole 612 in the second position P2 or the third position P3. The positioning spring 622 will rebound due to its tension and push the positioning ring 623, so that the front end of the positioning ring 623 is engaged in the positioning hole 612 to fix the position of the swing arm 23.

[0034] When the locking mechanism 60 is in the second position P2, the positioning member 62 is located in the positioning hole 612 in front of the positioning groove 611 of the fixed plate 61. The swing arm 23 of the machine tool body 20 and the third connecting rod 43 are tilted forward. Thus, the processing module 22 pivotally connected to the top of the swing arm 23 is tilted forward more than in the first position P1. As a result, the position of the saw blade 224 is further forward, making the cutting position farther away from the swing arm 23.

[0035] When the locking mechanism 60 is in the third position P3, the positioning member 62 is located in the positioning hole 612 behind the positioning groove 611 of the fixed plate 61. The swing arm 23 and the third connecting rod 43 of the machine tool body 20 tilt backward. As a result, the processing module 22 pivotally connected to the top of the swing arm 23 tilts backward more than in the first position P1. As a result, the position of the saw blade 224 is further back, so that the cutting position is closer to the swing arm 23.

[0036] In summary, the saw blade guard 30 of the present invention, which enables the sawing machine 10 to be raised, has at least the following advantages compared with the prior art:

[0037] 1. In the sawing machine tool 10 of the present invention, the saw blade guard 30 is connected to the fixed guard 31 and the movable guard 32 by the elastic member 33. Through the characteristic of the elastic member 33 to transmit force, when the fixed guard 31 is flipped downward, the movable guard 32 can rotate clockwise with the pin 45 pivotally connected to the first connecting rod 41 and the pin 34 pivotally connected to the connecting plate 311 as fulcrums, so that the movable guard 32 can be flipped upward relative to the fixed guard 31 to achieve the function of automatic lifting, making the sawing operation safer and more convenient.

[0038] 2. In the sawing machine tool 10 of the present invention, the movable guard 32 can also be displaced along the first guide groove 411 of the guide mechanism 40, so that the covering element 50 is driven. In this way, the part originally covered by the covering element 50 can be exposed, so that the user can maintain the processing module 22 without disassembling the saw blade guard 30, thereby improving work efficiency.

[0039] Finally, it must be stated again that the constituent elements disclosed in the above-mentioned embodiments of the present invention are merely illustrative examples and are not intended to limit the scope of this application. Substitutions or variations of other equivalent elements should also be covered by the scope of the patent application of this application. [Simplified Explanation of the Diagram]

[0040] Figure 1 is a perspective view of the present invention; Figure 2 is a perspective view of the present invention, showing another perspective of Figure 1; Figure 3 is an exploded perspective view of the present invention; Figure 4 is an exploded perspective view of the saw blade guard of the present invention; Figure 5 is an exploded perspective view of the guiding mechanism of the present invention; Figure 6 is an exploded perspective view of the locking mechanism of the present invention; Figure 7 is a sawing schematic diagram of the present invention, showing the action of the saw blade guard flipping; Figure 8 is a partial enlarged view of the present invention, showing the covering element covering the spindle screw; Figure 9 is a partial enlarged view of the present invention, showing the positional relationship between the covering element and the movable guard; Figure 10 is a schematic diagram of saw blade replacement of the present invention, showing the positional relationship of each component; Figure 11 is an operation schematic diagram of the present invention, showing the state of the second position; Figure 12 is an operation schematic diagram of the present invention, showing another perspective of Figure 11; Figure 13 is an operation schematic diagram of the present invention, showing the state of the third position; and Figure 14 is an operation schematic diagram of the present invention, showing another perspective of Figure 13.

Claims

1. A sawing machine tool, comprising: a machine tool body having a worktable, a processing module, and a swing arm pivotally connecting the worktable and the processing module; a saw blade guard disposed in the processing module of the machine tool body, having a fixed guard, a movable guard, and an elastic member, the two ends of the elastic member being respectively disposed in the fixed guard and the movable guard, wherein when the processing module is flipped downward relative to the swing arm, the movable guard flips upward relative to the fixed guard through the elastic member; a guide mechanism disposed in the movable guard of the saw blade guard, one end of the guide mechanism having a first guide groove connected to the movable guard of the saw blade guard; and a covering element disposed in the fixed guard and the movable guard of the saw blade guard, the covering element being driven when the movable guard of the saw blade guard deflects along the first guide groove of the guide mechanism relative to the fixed guard; wherein... The fixed guard is fixed to the machining module of the machine tool body. The fixed guard and the movable guard are connected to each other through a connecting plate. The guide mechanism is connected to the movable guard of the saw blade guard by a pin through the first guide groove.

2. The sawing machine tool as claimed in claim 1, wherein the processing module of the machine tool body includes a housing, a motor disposed within the housing, a saw blade connected to the motor via a spindle screw, and a handle fixed to the housing.

3. The sawing machine tool as claimed in claim 1, wherein one end of the swing arm of the machine tool body is pivotally connected to the worktable via a lower pivot, and the other end is pivotally connected to the processing module and the guiding mechanism via an upper pivot.

4. The sawing machine tool as claimed in claim 1, wherein the guiding mechanism further has a second guide groove, the guiding mechanism being connected to the processing module of the machine tool body via a pin passing through the second guide groove, so that the processing module is flipped downward relative to the swing arm along the second guide groove.

5. The sawing machine as claimed in claim 1, wherein the other end of the guiding mechanism is fixed to the worktable of the machine body.

6. The sawing machine tool as claimed in claim 1, wherein the fixed cover of the saw blade guard has the connecting plate and a third guide groove formed in the connecting plate, the covering element passes through the third guide groove and abuts against the inner side of the movable cover, the covering element is displaced along the third guide groove when it is driven, and the connecting plate is used to fix one end of the elastic member.

7. The sawing machine tool as claimed in claim 1, wherein the inner side of the movable guard of the saw blade guard has a connecting portion, a connecting hole disposed in the center of the connecting portion, and at least one pushing portion formed in the connecting portion, the movable guard is pivotally connected to the fixed guard through the connecting hole via a pin, the pushing portion abuts against the covering element, and the connecting portion is used to fix one end of the elastic member.

8. The sawing machine tool as described in claim 1, 6 or 7, wherein the elastic element of the saw blade guard is a torsion spring.

9. The sawing machine tool as claimed in claim 1, wherein the cover element has a protrusion and a connecting hole through both sides of the cover element, the cover element passes through the protrusion through the fixed cover of the saw blade guard to abut against the inner side of the movable cover, and the cover element passes through the connecting hole through a pin to be connected to the fixed cover.

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