TWI577475B - Foldable miter saw having a safety device and folding method thereof - Google Patents

Description

Retractable sawing machine with safety device and safety folding method for sawing machine

The invention relates to a sawing machine, in particular to a safe folding method for a foldable sawing machine and a sawing machine with a safety device.

There is a sawing machine (the prior art of the patent application of the Republic of China Publication No. 201325776), comprising a base unit, a processing platform rotatable relative to the base unit, and a sawing unit coupled to one side of the processing platform And a positioning unit. The base unit has a base and two feet respectively fixed on both sides of the base, and the positioning unit has a rotating rod screwed on the processing platform. When the sawing angle of the sawing unit is to be adjusted, the operator must loosen the rotating rod, and use the processing platform to drive the sawing unit to rotate relative to the base unit, and when the sawing unit is turned to the predetermined At the angle, tighten the lever.

In addition, in the case of the Patent Application No. 201420239 of the Republic of China, the use of a fan-shaped plate-like fixing member and a positioning unit can achieve adjustment of a sawing unit of the saw blade relative to a top surface of a saw table. The angle of inclination of the saw blade with respect to the top surface of the saw table is at most 45 degrees for the purpose of tilting the predetermined angle to achieve the machining angle.

Although the current sawing machine has the above two operational functions of adjustable sawing angle, when the sawing machine is temporarily not used and needs to be temporarily stored, the overall assembled state is bulky and takes up a large space. In addition, when the sawing machine is manufactured and is intended to be packed and transported, if it is packaged in an assembled state, the volume is increased and the handling cost is increased.

Furthermore, when the sawing machine is not in use or in a state of being stored, there is a possibility that the saw blade is started to operate due to an operator accidentally touching the switch.

Accordingly, it is an object of the present invention to provide a foldable sawing machine having a safety device that provides safety protection when folded.

Another object of the present invention is to provide a safe folding method for a sawing machine that can provide safety protection when folded.

Accordingly, the present invention has a retractable sawing machine with a safety device, comprising a base unit, a saw table, a sawing unit and a safety switch unit. The base unit has a front side edge, a rear side edge opposite to the front side edge, a left side edge between the front side edge and the rear side edge, a right side edge opposite to the left side edge, and a front side The rim extends to a bottom surface of the rear side edge and a top surface opposite the bottom surface. The saw table is rotatably mounted to the base unit, and has a working surface opposite to the bottom surface and corresponding to the top surface, and a shaft seat corresponding to the rear side edge and connected to the working surface, the shaft seat There is an axis parallel to the working face and extending from the rear side edge toward the front side edge. The sawing unit includes a rotating member disposed on the shaft seat and rotatable relative to the sawing table, a supporting arm pivotally connected to the rotating member, a saw blade mounted on the supporting arm, and a mounting bracket mounted on the supporting arm And a driver for driving the saw blade to rotate and an operating end adjacent to the saw blade and the driver, the one of the shaft seat and the rotating member has a positioning portion surrounding one side of the axis. The safety switch unit includes an operating member mounted on the operating end, a clamping member mounted to the shaft seat and the other of the rotating member, and a flexible connecting member connected between the operating member and the engaging member When the power of the driver can be started, the sawing unit is in an operating state, and the saw blade and the working surface generate a working angle. When the operating member is operated, the power of the driver cannot be activated, and the device is driven through the The sexual interlocking member interlocks the distal end of the engaging member with respect to the positioning portion, and the sawing unit is operable to be in a folded state by the working state, and the end surface of the saw blade approaches the working surface.

The method for safely folding the sawing machine of the present invention comprises the following steps: Step (A) preparing a base unit, a saw table, a sawing unit and a safety switch unit, the base unit having a front side edge and a reverse side a rear side edge of the front side edge, a left side edge between the front side edge and the rear side edge, a right side edge opposite to the left side edge, a bottom surface extending from the front side edge to the rear side edge, and a bottom surface Conversely opposite the top surface of the bottom surface, the saw table is rotatably mounted to the base unit, and has a working surface opposite to the bottom surface and corresponding to the top surface and a corresponding to the rear side edge and connected to the work a shaft seat having an axis parallel to the working surface and extending from the rear side edge toward the front side edge, the sawing unit including a shaft disposed on the shaft seat and rotatable relative to the saw table a support arm pivotally connected to the rotating member, a saw blade mounted on the support arm, a driver mounted on the support arm for driving the saw blade to rotate, and a drive adjacent to the saw blade and the driver An operating end, the shaft seat and the rotating member have a circumference a positioning portion on one side of the axis, the safety switch unit includes an operating member mounted on the operating end, a clamping member mounted to the shaft seat and the other of the rotating member, and a connecting member and the card Flexible connection between the parts. (B) operating the operating member, the power source of the driver cannot be activated, and the flexible connecting member is coupled to the distal end of the engaging member to be disengaged relative to the positioning portion. (C) operating the sawing unit to operate in a folded state by a working state, the sawing blade is in working state, the saw blade and the working surface generate a working angle, and when the sawing unit is in the folded state, the The end face of the saw blade approaches the work surface.

The effect of the invention is that the operating device can be operated before the folding unit is folded, and the power of the driver can be prevented from being activated, and the card can be remotely controlled to be disengaged relative to the positioning portion. The sawing unit can be operated in a folded state by the working state, and the safety of the folding operation can be achieved.

Referring to FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , an embodiment of a foldable sawing machine with a safety device of the present invention comprises a base unit 10 , a saw table 20 , a sawing unit 30 and a safety device . Switch unit 40.

The base unit 10 has a front side edge 11, a rear side edge 12 opposite to the front side edge 11, a bottom surface 13 extending from the front side edge 11 to the rear side edge 12, and a top surface opposite to the bottom surface 13 14. In terms of structure, the base unit 10 has a disk-shaped base 15 and two legs 16 radially connected to the two sides of the base 15. The front side edge 11 and the rear side edge 12 are respectively The base 15 and the feet 16 are formed together, and the top surface 14 is formed on the top of the feet 16.

The saw table 20 is mounted on the base 15 of the base unit 10 and interposed between the bases 16 and rotatable relative to the base unit 10 and has a surface opposite to the bottom surface 13 and corresponding to the top surface a working surface 21 of the 14 , a shaft seat 22 corresponding to the rear side edge 12 and connected to the working surface 21 , and a saw table operating handle 23 disposed opposite to the shaft seat 22 and extending outwardly 7 and 8, the shaft seat 22 has an axis L parallel to the working surface 21 and extending from the rear side edge 12 toward the front side edge 11, a rotating shaft 221 disposed along the axis L, and a positioning plate 222. The positioning plate 222 has a positioning portion 223 and a hole 224 formed on the side of the positioning portion 223.

The sawing unit 30 has a rotating member 31 that is axially disposed on the shaft seat 22 of the saw table 20 and rotatable relative to the base unit 10 and the saw table 20, and a guide that is slidably sleeved on the rotating member 31. a lead frame 32, a support arm 33 pivotally connected to the guide seat 32, a saw blade 34 mounted on the support arm 33, a driver 35 mounted on the support arm 33 for driving the saw blade 34 to rotate, An operation end 36 adjacent to the saw blade 34 and the driver 35, an operation handle 37 that is positioned relative to the support arm 33, a trigger 38 pivotally mounted to the operation grip 37, and a handle that is mounted to the operation grip A start switch 39 of 37, a lock member 50 mounted on the operation grip 37, and a return member 60 mounted between the lock member 50 and the operation grip 37 and providing the lock member 50 to return elastic force . The saw blade 34 has parallel left and right end faces. The operation grip 37 has a hollow shell shape and has a space 374, a pivot hole 371 connected to the outside by the space 374, and a first blocking portion 372 located inside the pivot hole 371 and protruding from the space 374. a second blocking portion 373. The trigger 38 is mounted in the space 374 and has a pivoting end 381 pivotally connected to the operating grip 37, a swinging end 382 opposite to the pivoting end 381, and a concave end 382 disposed at the pivoting end 382. The slot-shaped latching portion 383 is mounted in the space 374 and located between the pivoting end 381 and the swinging end 382. In addition, the rotating member 31 has a latch 311 that can be pulled. The latch 311 has a pin 312 slidably mounted inside the rotating member 31 and a spring between the pin 312 and the rotating member 31. The first spring 313, the elastic force of the first spring 31 constantly keeps the pin 311 to abut against the positioning plate 222. The latching member 50 has a pivoting portion 51 pivoted on one side of the swinging end 382, a latching portion 52 disposed on one side of the pivoting portion 51 and engageable in the latching portion 383, and a latching portion 52 The returning member 60 is opposite to the latching portion 52 and is disposed on the other side of the pivoting portion 51. The returning member 60 is a compression spring, and opposite ends are biased against the resilient portion 53 and the operating grip 37. between.

The safety switch unit 40 includes an operating member 41 mounted on the operating end 36 and having a shaft disposed in the pivot hole 371, a locking member 42 mounted on the rotating member 31, and a connecting member 41 and the card. A flexible connector 43 between the pieces 42.

The operating member 41 has a pulling portion 411 disposed outside the operating grip 37 and a linking portion 412 disposed inside the operating grip 37 and approaching the locking member 50. The linking portion 412 has a circle The disk 413 and a cam portion 414 protruding from one end surface of the disk 413, the cam portion 414 has a low end 414', a high end 414" opposite to the low end 414', and a lower end 414' A ramp 415 that gradually climbs toward the high end 414". In addition, the operating member 41 further has a first limiting portion 416 disposed at a side end of the cam portion 414 and a second limiting portion 417 disposed on the other end surface of the disk 413 and having a convex shape. 41 is rotated in one direction, the first limiting portion 416 can abut the first blocking portion 372 and position the operating member 41 relative to the operating grip 37, and the operating member 41 rotates in the other direction. The second limiting portion 417 can abut the second blocking portion 373 and position the operating member 41 relative to the operating grip 37. The engaging member 42 has a block 421 slidably mounted inside the rotating member 31 and a second spring 422 that is elastically engaged between the block 421 and the rotating member 31. The elastic force of the second spring 422 The card block 421 is kept in a tendency to snap toward the positioning plate 222. The flexible connector 43 is a steel cable.

As shown in FIG. 1 and FIG. 2, the sawing unit 30 of the sawing machine is shown in an operating state. In this state, the driver 35 is suspended above the working surface 21 of the saw table 20 when the workpiece is to be cut. When placed on the working surface 21, the support arm 33 that operates the sawing unit 30 slides relative to the guide seat 32, and the saw blade 34 is swung downward relative to the rotating member 31 to achieve vertical sawing. The purpose of cutting the workpiece. Referring to FIG. 5, FIG. 6, and FIG. 9, the pulling portion 411 of the operating member 41 of the safety switch unit 40 is substantially parallel to the operating grip 37. At this time, the lower end 414' of the cam portion 414 corresponds to The latching portion 52 of the latching member 50 is biased by the elastic force of the restoring member 60, and the latching portion 52 is removed from the latching portion 383 of the trigger 38. The locking member 50 is in a disengaged position.

At this time, the trigger 38 can be pivoted relative to the operation grip 37, and when the swinging portion 382 of the trigger 38 is pressed to pivot relative to the operation grip 37, the trigger switch 38 can be used to activate the start switch 39, and The power of the driver 35 is activated, and the operator operates the operating terminal 36 to perform a sawing operation. As shown in FIG. 7 and FIG. 8 , in the state in which the sawing unit 30 can perform the sawing operation, the engaging member 42 is nested in the positioning portion 223, so that the positioning portion 223 is curved in the shape of a groove. The sawing unit 30 can be operated to produce a predetermined angle of chamfering operation relative to the sawing table 20 (the saw blade 34 is inclined with respect to the working surface 21), and the latch 311 abuts against the positioning plate 222 (the The first spring 313 is compressed to retain the release capability.

As shown in FIG. 1 , when the operator pulls the saw table operation handle 23 and causes the saw table 20 to rotate the saw unit 30 relative to the base unit 10 , the saw unit 30 can be used to cut The workpiece is processed by oblique sawing (not shown).

When the sawing machine is temporarily not used and is intended to be stored or intended to be packaged, the operator first operates the saw table 20 to drive the sawing unit 30 to rotate to the left side of FIG. 1 at a 45 degree angle with respect to the base unit 10 (with reference) 11). As shown in FIG. 10, when the operator pulls the triggering portion 411 of the operating member 41 and the pulling portion 411 is substantially upright with respect to the operating grip 37, the inclined surface 415 of the cam portion 414 gradually becomes paralyzed. The locking portion 52 of the locking member 50 is inserted into the engaging portion 383 of the trigger 38 until the high end 414" corresponds to the locking portion 52, so that the locking member 50 can be located at a locking position. That is, the locking member 50 is swayed by the operating member 41, so that the triggering position of the trigger 38 is changed to a locking position for the triggering of the trigger 38. Meanwhile, the locking member 50 is The pressing portion 53 presses the returning member 60, and the swinging portion 382 of the trigger 38 is restricted to be positioned relative to the operating grip 37, and the rotating grip 37 cannot be rotated relative to the operating grip 37, that is, the The trigger 38 does not cause the activation switch 39 to be activated, and the power of the driver 35 cannot be activated.

At this time, referring to FIG. 11 , FIG. 12 and FIG. 13 , because the rotation of the operating member 41 acts, the distal end of the clamping member 42 is interlocked through the flexible connecting member 43 , and the clamping member 42 is The positioning portion 223 is removed, so that the operator can operate the rotating member 31 of the sawing unit 30 to rotate relative to the shaft seat 22, and drive the sawing unit 30 as a center of rotation with respect to the saw table 20 as a whole. Rotating until the end surface of the saw blade 33 approaches the working surface 21 and is nearly parallel or parallel to the working surface 21, the sawing unit 30 can be operated in a folded state, at which time, when the latch 311 is aligned When the pin hole 224 is subjected to the elastic force of the first spring 313, the pin 312 is automatically embedded in the hole 224, and the sawing unit 30 is caused to be folded relative to the base unit 10. In addition, when the triggering portion 411 is pulled and the locking member 50 is moved toward the trigger 38 , the second limiting portion 417 is positioned against the second blocking portion 373 .

Before the operator wants to operate the sawing unit 30 from the folded state to the working state, the latch 311 must be operated to be detached from the card hole 224, so that the sawing unit 30 can be restored to FIG. 2 and the state of Figure 7. When the sawing unit 30 returns to the state of FIG. 1, FIG. 2 and FIG. 7, the operator again operates the operating member 41 to return to the state of FIG. 9, and the locking member 50 can be made by the elastic force of the returning member 60. Returning to the release position, and using the action of the rotation of the operating member 41, the pulling force generated on the flexible connecting member 43 can be released, and the elastic force of the second spring 422 can be used to make the engaging member 42 It is embedded in the positioning portion 223. When the triggering portion 411 is pulled and the locking member 50 is moved away from the trigger 38, the first limiting portion 416 is positioned against the first blocking portion 372.

Therefore, the method for safely folding the sawing machine of the present invention comprises the following steps:

Step 1: Prepare the base unit 10, the saw table 20, the sawing unit 30, and the safety switch unit 40 as described above. As shown in FIG. 1 , FIG. 2 , FIG. 5 , FIG. 6 , FIG. 7 , FIG. 8 and FIG. 9 , when the operating member 41 does not move the locking member 50 and the locking member 50 is in a releasing position, the The trigger 38 is rotatable relative to the operating grip 37 and the drive 35 can be normally activated for sawing operations. At this time, the clamping member 42 generates a moderate sliding in the positioning portion 223, so that when the sawing unit 30 generates a predetermined working angle with respect to the working surface 21 of the saw table 20, the driver 35 is still suspended. Above the working surface 21 of the saw table 20, the purpose of obliquely sawing the workpiece to be cut can be achieved.

Step 2: When the folding member is to be folded, the operating member 41 is operated, and the locking member 50 is moved by the operating member 41 to be in the locking position, and the locking member 50 is engaged with the trigger 38. The trigger 38 can be Positioning relative to the handle grip 37 produces a trigger 38 that does not cause actuation of the activation switch 39.

Step 3: Operation The sawing unit 30 is operated from the working state shown in FIGS. 1 and 2 into a folded state as shown in FIGS. 11 and 12 such that the end surface of the saw blade 34 approaches the working surface 21. At this time, the latch 311 is embedded in the card hole 224 to ensure that the saw unit 30 is maintained in the folded state.

Therefore, the sawing machine of the present invention can prevent the driver 35 from being activated by operating the operating member 41 of the safety switch unit 40 before folding the sawing unit 30. Therefore, in the sawing unit 30 During the folding operation, the operator will not be in danger due to malfunction, which can improve the safety of the operation. And the flexible connecting member 43 is connected between the operating member 41 and the engaging member 42. Therefore, when the operating member 41 is operated and the locking member 50 is rotated, the engaging member can be simultaneously linked. 42. The power supply of the driver 35 cannot be activated, and the operation of the sawing unit 30 to rotate and fold relative to the sawing table 20 is facilitated, which not only improves the safety of the operation, but also improves the safety of the sawing machine. The safe folding method is quite simple.

In summary, the foldable sawing machine with the safety device of the present invention can achieve the purpose of safe operation.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

10‧‧‧ base unit
11‧‧‧ front edge
12‧‧‧ rear edge
13‧‧‧ bottom
14‧‧‧ top surface
15‧‧‧Base
16‧‧‧ feet
20‧‧‧Saw table
21‧‧‧Working face
22‧‧‧ shaft seat
23‧‧‧Saw table operation handle
L‧‧‧ axis
221‧‧‧ shaft
222‧‧‧ Positioning board
223‧‧‧ Positioning Department
224‧‧‧Kakong
30‧‧‧ sawing unit
31‧‧‧Rotating parts
311‧‧‧Latch
312‧‧‧ pin
313‧‧‧First spring
32‧‧‧ Guide seat
33‧‧‧Support arm
34‧‧‧Saw blade
35‧‧‧ drive
36‧‧‧Operator
37‧‧‧Operation grip
371‧‧‧ pivot hole
372‧‧‧ first stop
373‧‧‧second stop
374‧‧‧ Space
38‧‧‧ Trigger
381‧‧‧ pivotal department
382‧‧‧Swing
383‧‧‧ embedded card department
39‧‧‧Start switch
50‧‧‧Locks
51‧‧‧Axis
52‧‧‧Locking Department
53‧‧‧Blasting Department
60‧‧‧Response
40‧‧‧Safety switch unit
41‧‧‧Operating parts
411‧‧‧Turning Department
412‧‧‧ linkage department
413‧‧‧ disc
414‧‧‧ cam parts
414'‧‧‧Low end
414"‧‧‧ high end
415‧‧‧Slope
416‧‧‧First Limitation Department
417‧‧‧Second Limitation
42‧‧‧Card parts
421‧‧‧ card block
422‧‧‧Second spring
43‧‧‧Flexible connectors

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a perspective view of an operational state, illustrating one of the foldable sawing machines of the present invention having a safety device 2 is a perspective exploded view of another embodiment of the present invention; FIG. 3 is an exploded perspective view of an embodiment of the present invention; FIG. Figure 1 is a side view of a combination of the above embodiment of the present invention; Figure 6 is a cross-sectional view taken along line VI-VI of Figure 5; Figure 7 is a view of the present invention Figure 8 is a cross-sectional view taken along line VIII-VIII of Figure 7; Figure 9 is a schematic view of a combination of the safety switch unit of the above embodiment of the present invention, illustrating a The operating member does not move a locking member and the locking member is in the disengaged position, and the trigger is in an operable state; FIG. 10 is a schematic diagram of the operation of the safety switch unit according to the above embodiment of the present invention, illustrating the operation operating FIG. 11 is a perspective view showing a state in which the trigger member is in a latching position and the trigger is inoperable; FIG. 11 is a perspective view showing a state in which the above-described embodiment of the present invention is folded; FIG. A rear view of the folded state; and Fig. 13 is a cross-sectional view taken along line XIII-XIII of Fig. 12.

10‧‧‧ base unit

312‧‧‧ pin

11‧‧‧ front edge

313‧‧‧First spring

12‧‧‧ rear edge

32‧‧‧ Guide seat

13‧‧‧ bottom

33‧‧‧Support arm

14‧‧‧ top surface

34‧‧‧Saw blade

15‧‧‧Base

35‧‧‧ drive

16‧‧‧ feet

36‧‧‧Operator

20‧‧‧Saw table

37‧‧‧Operation grip

21‧‧‧Working face

371‧‧‧ pivot hole

22‧‧‧ shaft seat

374‧‧‧ Space

23‧‧‧Saw table operation handle

38‧‧‧ Trigger

L‧‧‧ axis

39‧‧‧Start switch

221‧‧‧ shaft

50‧‧‧Locks

222‧‧‧ Positioning board

60‧‧‧Response

223‧‧‧ Positioning Department

40‧‧‧Safety switch unit

224‧‧‧Kakong

41‧‧‧Operating parts

30‧‧‧ sawing unit

411‧‧‧Turning Department

31‧‧‧Rotating parts

412‧‧‧ linkage department

311‧‧‧Latch

42‧‧‧Card parts

43‧‧‧Flexible connectors

Claims (10)

A foldable sawing machine having a safety device, comprising: a base unit having a front side edge, a rear side edge opposite to the front side edge, and a left side edge between the front side edge and the rear side edge a bottom edge opposite to the left edge, a bottom surface extending from the front edge to the rear edge, and a top surface opposite to the bottom surface; a saw table rotatably mounted to the base unit and having a working surface opposite to the bottom surface and corresponding to the top surface and a shaft seat corresponding to the rear side edge and connected to the working surface, the shaft seat has a parallel to the working surface and the rear side edge faces the An axis extending from the front side edge; a sawing unit comprising a rotating member disposed on the shaft seat and rotatable relative to the saw table, a supporting arm pivotally coupled to the rotating member, and a saw blade mounted to the supporting arm a driver mounted on the support arm for driving the saw blade to rotate, and an operating end adjacent to the saw blade and the driver, the shaft seat and the rotating member having a side disposed on the axis Positioning portion; and a safety switch unit, including a mounting An operating member of the operating end, a clamping member mounted to the shaft seat and the other of the rotating member, and a flexible connecting member connected between the operating member and the engaging member, the power of the driver can be activated When the sawing unit is in an operating state, and the saw blade and the working surface generate a working angle, when the operating member is operated, the power of the driver cannot be activated, and the card of the far end is linked through the flexible linking member The workpiece is disengaged relative to the positioning portion, and the sawing unit is operable to be in a folded state by the working state, and an end surface of the saw blade approaches the working surface. The retractable sawing machine with a safety device according to claim 1, wherein the positioning portion is in the shape of a hole and is disposed on the shaft seat, and the clamping member is slidably mounted on the rotating member, the sawing unit The utility model further comprises a latch mounted on the rotating member and operable, the axle seat having a latching hole, wherein when the sawing unit is operated in the folded state, the latch is embedded in the latching hole, so that the sawing can be cut The unit is held in a folded state relative to the saw table, and the sawing unit is operated to disengage from the card hole before the folding state is to be operated in the working state. The retractable sawing machine with a safety device according to claim 1, wherein the sawing unit further comprises an operating grip that is positioned relative to the support arm, a trigger pivoted to the operating grip, a start switch mounted on the operating grip, a locking member mounted on the operating grip, and a returning member mounted between the locking member and the operating grip and providing a resilient force of the locking member, The operating grip and the trigger are disposed at the operating end, and the locking member is swayed by the operating member, so that the trigger can be converted from a release position capable of generating a rotation to a locking position for locking the trigger. When the locking component is in the releasing position, the triggering device can activate the starting switch and can activate the power of the driver. When the locking component is in the locking position, the trigger generates a positioning relative to the operating grip. The elastic force constantly keeps the locking member in the disengaged position. The retractable sawing machine with a safety device according to claim 3, wherein the operating member of the safety switch unit has a trigger portion disposed outside the operating grip, and is disposed inside the operating grip and Adjacent to the interlocking portion of the locking member, the linking portion has a disc and a cam portion protruding from the disc, the cam portion has a sloped surface, and the pulling portion is configured to engage the disc to drive the disc a beveling surface of the cam portion is rotated relative to the locking member, and the locking member is movable away from or approaching the triggering member. When the locking member is away from the triggering device, the locking member is in the releasing position, the locking member When the fastener approaches the trigger, the locking member is snapped to the trigger and is in the latching position. The retractable sawing machine with a safety device according to claim 4, wherein the operating member of the safety switch unit further has a first limiting portion and a second limiting portion disposed on the linking portion, The operating grip of the sawing unit further has a first blocking portion and a second blocking portion. When the pulling portion is pulled and the locking member is moved away from the trigger, the first limiting portion abuts against The first blocking portion generates a positioning, and when the pulling portion is pulled and the locking member is moved toward the trigger, the second limiting portion is positioned against the second blocking portion. A method for safely folding a sawing machine comprises the following steps: (A) preparing a base unit, a saw table, a sawing unit and a safety switch unit, the base unit having a front side edge and a opposite a rear side edge of the front side edge, a left side edge between the front side edge and the rear side edge, a right side edge opposite to the left side edge, a bottom surface extending from the front side edge to the rear side edge, and an opposite a top surface of the bottom surface, the saw table is rotatably mounted to the base unit, and has a working surface opposite to the bottom surface and corresponding to the top surface and a corresponding to the rear side edge and connected to the working surface a shaft seat having an axis parallel to the working surface and extending from the rear side edge toward the front side edge, the sawing unit including a rotating member axially disposed on the shaft seat and rotatable relative to the saw table, a support arm pivotally connected to the rotating member, a saw blade mounted on the support arm, a driver mounted on the support arm for driving the saw blade to rotate, and an operating end adjacent to the saw blade and the driver One of the shaft seat and the rotating member has a surrounding a positioning portion on one side of the axis, the safety switch unit includes an operating member mounted on the operating end, a clamping member mounted to the shaft seat and the other of the rotating member, and a connecting member and the engaging member (B) operating the operating member, the power source of the driver cannot be activated, and the flexible connecting member is coupled to the distal end of the engaging member to be disengaged relative to the positioning portion; and (C) Operating the sawing unit to operate in a folded state by a working state, the sawing blade is in working state, the saw blade and the working surface generate a working angle, and the sawing unit is in a folded state, the saw blade is The end face approaches the work surface. The method for safely folding the sawing machine according to claim 6, wherein the positioning portion prepared in the step (A) is in the shape of a hole and is disposed on the shaft seat, and the clamping member is slidably mounted on the rotating member. The sawing unit further includes a latch mounted to the rotating member and operable, the axle housing having a card hole, the safety folding method further comprising a step between the step (B) and the step (C) In the step (B-1), the step (B-1) is to operate the latch to be detached from the card hole. The method for safely folding a sawing machine according to claim 6, wherein the sawing unit prepared in the step (A) further comprises an operating grip that is positioned relative to the supporting arm, and is pivoted to the operation. a trigger of the grip, a start switch mounted to the operating grip, a locking member mounted to the operating grip, and a lock member mounted between the locking member and the operating grip and providing the resilient resilient force of the locking member Responsible member, the operation grip and the trigger are disposed at the operating end, the step (B) of the locking member is swayed by the operating member, and the trigger can be operated by a release position that enables the trigger to generate a rotation A latching position is generated, and when the locking component is in the releasing position, the trigger is operated to activate the starting switch and the power of the driver can be activated. When the locking component is in the locking position, the trigger is opposite to the operation The grip creates a position, and the resilient force of the return member constantly maintains the locking member in the disengaged position. The method of safely folding the sawing machine according to claim 8, wherein the operating member of the safety switch unit prepared in the step (A) has a pulling portion disposed outside the operating grip, and is disposed at the Operating the inside of the grip and approaching the interlocking portion of the locking member, the linking portion has a disc and a cam portion protruding from the disc, the cam portion having a slope, the step (B) pulling the The triggering portion can interlock the disc to drive the inclined surface of the cam portion to rotate relative to the locking member, and can move the locking member away from or approach the trigger. When the locking member is away from the trigger, The locking member is in a disengaged position, and the locking member is engaged with the trigger and is located at the locking position when the locking member approaches the trigger. The method for safely folding the sawing machine according to claim 9, wherein the operating member of the safety switch unit prepared in the step (A) further has a first limiting portion and a second portion disposed on the linking portion a limiting portion, the operating grip of the sawing unit further has a first blocking portion and a second blocking portion, wherein the step (B) is to move the pulling portion and the locking member is moved away from the trigger The first limiting portion abuts against the first blocking portion to generate a positioning, and when the pulling portion is pulled and the locking member is moved toward the trigger, the second limiting portion abuts against the first limiting portion The second stop produces a position.