CN101204751B

CN101204751B - Saw blade clamping mechanism and method with same

Info

Publication number: CN101204751B
Application number: CN2006101664471A
Authority: CN
Inventors: 张士松; 钟红风
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2006-12-22
Filing date: 2006-12-22
Publication date: 2011-03-16
Anticipated expiration: 2026-12-22
Also published as: CN101204751A

Abstract

The invention discloses a saw bit clamping mechanism (1) and a method for mounting the saw bit. The saw bit clamping mechanism includes a supporting beat (3) provided with a saw bit holding slot (3h), a first elastic element (12) is resisted with a sliding element (4). The sliding element (4) moving along the reciprocating direction of the saw bit opposite to the supporting seat (3) is arranged on a compacting element (9) between the supporting seat (3) and the sliding element (4). The saw bit clamping mechanism also includes a stop mechanism arranged between the sliding element (4) and the supporting seat (3) to stop the trend of the sliding element (4) to overcome the restoring force of the first elastic element (12) to move and avoid the danger that the saw bit (2) escapes caused by the effectiveness losing of the clamping force during a process than a tool is moving in a high speed.

Description

Saw blade clamping mechanism and method for clamping saw blade

Technical Field

The invention relates to a saw blade clamping mechanism, in particular to a saw blade clamping mechanism of a reciprocating electric tool and a method for clamping a saw blade by the saw blade clamping mechanism.

Background

There are a variety of reciprocating type power tool blade clamping mechanisms available on the market, both rotary and sliding. The saw blade is relatively fixed by applying clamping forces in different directions to the saw blade. For example, U.S. patent No. 6260281 discloses a slide type blade clamping device in which an operating member is longitudinally moved relative to a blade supporting base to move a pressing member in a direction perpendicular to a pressing surface between a locking position and a releasing position, and the operating member is automatically returned from the releasing position to the locking position by an elastic member. However, in the saw blade clamping mechanism, when the tool moves at a high speed, the elastic element is compressed under the action of the inertia force of the chuck due to the increase of the movement inertia of the chuck, so that the pressure for pressing the saw blade fails, and the saw blade is easy to loosen.

Disclosure of Invention

An object of the present invention is to provide a blade clamping mechanism capable of preventing a blade clamping force from being lost in high-speed movement of a tool and a method for clamping a blade using the same.

According to the invention, a saw blade clamping mechanism comprises a supporting seat provided with a saw blade accommodating groove, a sliding piece moving along the reciprocating motion direction of a saw blade relative to the supporting seat, a first elastic element abutting against the sliding piece and pressing the sliding piece from a release position to a pressing position, and a pressing element arranged between the sliding piece and the accommodating groove. The one-way clutch comprises a stop inclined plane arranged on one of the sliding piece and the supporting seat, a stop element arranged between the stop inclined plane and the supporting seat, and a second elastic element abutted between the stop element and the sliding piece.

Preferably, the sliding member includes a pressing inclined surface abutting against the pressing element, and the pressing inclined surface and the stopping inclined surface are inclined in opposite directions, so that one-way clutch of the sliding member relative to the supporting seat can be realized.

In order to make the whole locking mechanism simple in structure and convenient to operate, the stop inclined plane is arranged on the inner side of the sliding part. Thus, the pressing inclined plane and the stopping inclined plane are arranged on one element at the same time, the processing is easy, and the structure of the part is compact.

The stop element is a cylindrical steel column which can be in rolling contact with and separated from the stop inclined surface. A third elastic element is arranged between the operating element and the sliding piece. The third elastic element is integrally formed with the operating element.

Preferably, a pressing plate is arranged in the accommodating groove, and a boss is arranged on the pressing plate and is in contact with the pressing element. So that it can be adapted to clamp saw blades of various thicknesses.

The pressing element is a cylindrical steel column and is horizontally arranged in the receiving hole on the supporting seat, and the axis of the pressing element is parallel to the axis of the stopping element.

The bearing seat is internally provided with a containing cavity, the shape of the containing cavity is matched with the corresponding part of the sliding part, and the containing cavity can be arranged in a T shape or a dovetail shape.

The stopping device is arranged between the saw blade supporting seat and the sliding piece, and in the high-speed movement process of the tool, the stopping device is always meshed with the sliding piece under the action of no external force, so that the sliding piece is prevented from overcoming the tendency of restoring force movement of the elastic element, the supporting seat and the sliding piece are kept in a meshed state under the action of the pressing element, and the risk that the clamping force fails and the saw blade is separated is avoided.

In response to the above-described blade clamping mechanism, it is necessary to apply a method of clamping a saw blade: firstly, the stopping device is pushed along the insertion direction of the saw blade, the sliding piece slides relative to the supporting seat along the direction of inserting the saw blade into the accommodating groove by overcoming the acting force of the first elastic element, the saw blade is inserted into the accommodating groove, the sliding piece is released, the stopping device returns to the initial position, and the pressing element radially clamps the saw blade.

For the convenience of operation, when the stopping device is pushed, the operating element is pushed to move against the acting force of the third elastic element firstly, and the stopping element is separated from the stopping inclined surface against the acting force of the second elastic element. Preferably, the operating element pushes the stop element in the direction of insertion of the saw blade until the operating element pushes the slide after it has come into abutment against the slide.

In this way, no relative sliding movement can occur between the slide and the bearing block before the stop means have been released. And once the saw blade is clamped, even if the pressing element has the tendency of being separated from the pressing inclined plane in the process of high-speed movement of the saw blade, the sliding piece and the supporting seat are always kept relatively fixed by the action of the stop device. Clamping force failure can be avoided.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an exploded schematic view of the present invention;

FIG. 2 is a schematic view of the assembly of the present invention in its home position;

FIG. 3 is a perspective view of the support base of the present invention;

FIG. 4 is a cross-sectional view of the bearing block of the present invention taken along its centerline;

FIG. 5 is a cross-sectional view of the slider of the present invention taken along its centerline;

FIG. 6 is a schematic view of the first preferred embodiment of the present invention taken along line A-A of FIG. 2, with the pressing member and slide in the original pressing position;

FIG. 7 is a cross-sectional view of the first preferred embodiment of the present invention taken along line D-D of FIG. 2, with the compression member and slide in the original compression position;

FIG. 8 is a schematic view of the first preferred embodiment of the present invention taken along line A-A of FIG. 2, with the operating member urging the stop member out of engagement with the stop ramp;

FIG. 9 is a schematic view of the first preferred embodiment of the present invention taken along line D-D of FIG. 2, with the operating member urging the stop member out of engagement with the stop ramp;

figure 10 is a schematic view of the first preferred embodiment of the invention taken along line a-a in figure 2, with the operating element and the slide axially displaced a distance relative to the abutment, and with the pressing element disengaged from the pressing ramp;

FIG. 11 is a schematic view of the first preferred embodiment of the present invention taken along line D-D of FIG. 2, with the operating member and slide axially displaced a distance relative to the bearing block and the hold-down member disengaged from the hold-down ramp;

FIG. 12 is a schematic sectional view of the first preferred embodiment of the present invention taken along line B-B of FIG. 6;

FIG. 13 is a schematic sectional view of the second preferred embodiment of the present invention taken along line B-B of FIG. 6;

FIG. 14 is a schematic sectional view of the third preferred embodiment of the present invention taken along line B-B of FIG. 6;

FIG. 15 is a schematic view of a fourth preferred embodiment of the present invention taken partially along the line D-D in FIG. 2;

FIG. 16 is a schematic view of a fifth preferred embodiment of the present invention taken partially along the line D-D in FIG. 2;

FIG. 17 is a schematic view of the present invention with the stop ramp disposed on the bearing block.

Wherein,

1 saw blade clamping mechanism 2 saw blade 2a bearing surface

2b small hole 2c notch 3 support

3a receiving cavity 3b receiving hole 3c connecting hole

3d cylindrical front part 3e positioning hole 3f bearing seat middle part

3i pin hole of 3h accommodating groove at rear part of 3g supporting seat

4, 4' sliding piece 4a with a circular middle part 4b protruding

4c opening 4d flank 4e pressing slope

4f, 4 f' stop ramp 4g first step surface 4h second step surface

4i front part 4j rear part 4k end face

41 accommodating space 5 operating element of one-

way clutch

6, 6

6a extension foot 6b tip 6c1 third elastic element

6c2 third elastic element 6c3 third elastic element 6e operating part

6h inner wall 7 stop element 8 second elastic element

9 pressing element 10 pressing plate 10a guiding part

10b boss 10c through hole 10d blind hole

12 first elastic element 13 washer 14 first elastic pin

15 locating pin 16 second elastic pin 20 reciprocating rod

20a opening 61 Lever 62 Pivot

Slide rail with 63 end 6 e' sliding part 4m

Detailed Description

Referring to fig. 1, a saw blade clamping mechanism 1 is disclosed. Such blade clamping mechanisms are applicable to reciprocating-type power tools, such as reciprocating saws and jig saws. In the invention, the saw blade clamping mechanism 1 comprises a bearing block 3, a slide 4, a pressing element 9, an operating element 6, a stop element 7 and the like.

Referring to fig. 1 to 12, in a first preferred embodiment of the present invention, a blade clamping mechanism 1 includes a supporting base 3 having a blade receiving groove 3h, a slider 4 moving relative to the supporting base 3 in a direction of reciprocating motion of a blade, a pressing member 9 disposed between the slider 4 and the receiving groove 3h, and a stopper. The supporting seat 3 is connected with the reciprocating rod 20, and moves along the axial direction of the reciprocating rod 20 together with the reciprocating rod 20, and the saw blade 2 moves together after being clamped. The supporting seat 3 includes a cylindrical front portion 3d, a through hole 3c is radially formed, and the first elastic pin 14 penetrates through the through hole 3c through an opening 20a of the reciprocating rod 20, so that the reciprocating rod 20 is connected with the supporting seat 3. A bearing seat middle part 3f extends axially along the cylindrical front part 3d of the bearing seat 3. The bearing block middle part 3f comprises two opposite curved surfaces and two opposite flat surfaces. A positioning hole 3e is formed in one plane and penetrates to the other opposite plane. A rear support base portion 3g extends axially from the support base middle portion 3 f. The rear part 3g of the bearing block comprises two vertical walls which are perpendicular to the plane of the middle part 3f of the bearing block and are arranged oppositely, two transverse walls which are parallel to the plane of the middle part 3f of the bearing block and transversely extend oppositely from the vertical walls, and a surface which is parallel and level to the plane of the middle part 3f of the bearing block. The two transverse walls are arranged at intervals. The two vertical walls, the transverse walls and the flat surfaces form a housing cavity 3a for housing the slider 4 and providing a guide for its axial movement with respect to the bearing block 3. The receiving cavity 3a is provided with a receiving hole 3b at the lower part. The pressing element 9 is arranged in the receiving hole 3 b. An accommodating groove 3h axially extending from the rear part 3g of the supporting seat to the middle part 3f of the supporting seat is formed below the receiving hole 3b, and the tail part of the saw blade 2 is movably inserted into the accommodating groove 3 h. The positioning hole 3e penetrates below the accommodating groove 3h, and the second elastic pin 16 penetrates through the positioning hole 3 e. The positioning pin 15 is arranged in a pin hole 3i formed in the rear part 3g of the supporting seat in a penetrating way, and the axis of the pin hole 3i and the axis of the positioning hole 3e are parallel to each other and arranged at intervals.

The slider 4 includes an annular central portion 4a, and front and

rear portions

4i and 4j extending axially from the annular central portion 4a in opposite directions, respectively. The front portion 4i includes a partially cylindrical outer surface and end portions arranged in parallel with the end faces of the annular middle portion. The interior of the cavity formed by the cylindrical outer surface and the end portion has an end face 4k which is relatively parallel to the end portion. In the preferred embodiment, the rear portion 4j of the slider 4 extends axially from the annular central portion 4a in a T-shaped arrangement. The two side wings 4d of the T-shape are slidably disposed in the housing cavity 3a of the support base 3 and move along the T-shaped groove formed by the two vertical walls and the transverse wall. The inner side of the slide 4 is provided with a pressing bevel 4e which comes into and out of contact with the pressing element 9, so that clamping of the saw blade 2 is achieved. Preferably, the pressure elements 9 are rolling elements, in particular cylindrical steel columns, lying in receiving bores 3b in the bearing block 3, the axial direction of which is perpendicular to the axial direction of the bearing block 3.

The reciprocating lever 20 is connected with the supporting seat 3 through an elastic pin 14, and a gasket 13 is arranged to abut against the elastic pin 14. A first elastic element 12 is provided between the slider 4 and a pad 13 fixed with respect to the bearing block 3. In the preferred embodiment, the first elastic element 12 is a cylindrical compression spring, and is sleeved on the periphery of the supporting seat 3, wherein one end surface abuts against a gasket 13 arranged between the supporting seat 3 and the reciprocating rod 20, and the other end surface abuts against an end surface of the annular middle portion 4a of the sliding member 4. Due to the provision of the first elastic element 12, the slider 4 can automatically return to the original pressed-state position if released by the operator. At the same time, however, when the reciprocating saw is moving at a high speed, the slider 4 is apt to compress the first elastic member 12 by the inertia force, so that the pressing slope 4e of the slider 4 is disengaged from the pressing member 9, and thus, the blade clamping force becomes small and ineffective, and the blade 2 is apt to be loosened from the receiving groove 3 h.

The idea of the invention is to provide a stop between the slide 4 and the abutment 3, preventing the slide 4 from moving relative to the abutment 3 during high speed movement of the tool. The stop means comprise an operating element 6 and a one-way clutch 5, the operating element 6 being movable relative to the one-way clutch 5, thereby allowing the slide 4 to move relative to the bearing block 3. The one-way clutch 5 comprises a stop ramp 4f provided on one of the slide 4 and the bearing block 3, a stop element 7 provided between the stop ramp 4f and the bearing block 3, and a second elastic element 8 abutting between the stop element 7 and the slide 4. When the tool moves at high speed, the sliding part 4 has a tendency to move along the X direction relative to the supporting seat 3 under the action of inertia force, and the stop element 7 and the stop inclined surface 4f are engaged and tightened under the action of the tendency, so that the movement of the sliding part 4 is limited, and the clamping force failure of the saw blade 2 is prevented. In the preferred embodiment, the stop ramp 4f is provided on the inner side of the slider 4, and is in contact with and disengaged from the stop member 7, thereby achieving the relative locking of the bearing block 3 and the slider 4. Thus, the pressing inclined surface 4e and the stopping inclined surface 4f are simultaneously arranged on one element, the processing is easy, and the structure of the part is compact. The pressing slope 4e is inclined in the opposite direction to the stopper slope 4 f. The one-way clutch 5 thus enables one-way clutching of the slider 4 relative to the bearing block 3.

The operating element 6 comprises an operating portion 6e, the inner wall of which is 6 h. An extension leg 6a extends in a direction perpendicular to the inner wall 6h, the extension leg 6a including a tip 6 b. During installation, the extension leg 6a extends from the opening 4c made in the slider 4 into the space between the slider 4 and the support 3, and the tip 6b thereof abuts against the stop member 7. A third elastic element 6c1 is arranged between the operating element 6 and the slider 4. Preferably, the third elastic element 6c1 is a spring sheet integrally formed with the operating element 6. Thus, the material of the entire operating element 6 is flexible, such as a plastic material. Preferably, the stop element 7 is a rolling element, in particular a cylindrical steel column, lying below a stop ramp 4f formed on the slide 4, the axial direction of which is perpendicular to the axial direction of the bearing block 3 and is arranged parallel to the axis of the pressing element 9 at a distance. The stop element 7 is rollably brought into and out of contact with the stop ramp 4 f. In the preferred embodiment, the second elastic element 8 is two compression springs, arranged in parallel between the stop element 7 and the slider 4. It will be appreciated by those skilled in the art that the resilient member may be provided as one, not limited to only a compression spring. The stop element 7 can be moved between two positions by the operating element 6. When the operating element 6 is moved against the force of the third elastic element 6c1, the tip 6b of its extension foot 6a pushes the stop element 7 to move axially along the bearing block 3 compressing the second elastic element 8, the stop element 7 is disengaged from the stop ramp 4f against the force of the second elastic element 8. When the operating element 6 is released, the slider 4 is released and the stop element 7 can return to the initial position against the stop ramp 4f by the restoring force of the second elastic element 8. The opening 4c in the rear portion 4j of the slider 4 is provided with two projections 4b symmetrically on both sides of the center line of symmetry of the slider 4, and each projection 4b includes a first step surface 4g and a second step surface 4h, respectively. The third elastic member 6c1 provided on the operating member 6 abuts on the second step surface 4 h. When the operating member 6 is moved in the direction of the reciprocating movement of the saw blade, the inner wall 6h of the operating portion 6e thereof comes into contact with the first step surface 4 g.

A pressure plate 10 can also be arranged between the bearing block 3 and the sliding member 4. When clamping the saw blade 2, the pressing element 9 does not come into direct contact with the pressure-bearing surface 2a of the saw blade 2, but the clamping force is applied by the pressure plate 10. In the preferred embodiment of the present invention, the pressing plate 10 has a rectangular body, and one end thereof is bent to form the guide portion 10 a. When the saw blade 2 is inserted into the housing groove 3h, the guide portion 10a can easily guide the saw blade 2. The body is provided with a through hole 10c at an end remote from the guide portion 10 a. A stamped boss 10b is provided spaced from the through hole 10c in the longitudinal direction of the body. The boss 10b is in contact with the outer surface of the pressing member 9. The back of the boss 10b is a punched blind hole 10 d. When the saw blade 2 is inserted into the receiving slot 3h, the small hole 2b of the saw blade 2 is sleeved on the part of the positioning pin 15 extending into the receiving slot 3h, and is opposite to the blind hole 10 d. The clamping force is applied uniformly to the saw blade 2 by pressing the saw blade 2 with the pressure plate 10. The extent to which the locating pins 15 project relative to each other varies for blades 2 of different thicknesses. For very thin blades, the saw blade 2 cannot extend completely beyond the positioning pin 15, with the result that the pressing element 9 acts directly on the positioning pin 15 without generating a radial clamping force on the saw blade 2. The pressure plate 10 can overcome the defect and easily clamp saw blades with various thicknesses.

Referring to fig. 13, in a second preferred embodiment of the present invention, the receiving cavity 3a may be formed as a dovetail slide groove, and accordingly, the rear portion 4j of the slider 4 is also formed as a dovetail shape so as to be matched with the receiving cavity 3 a.

Referring to fig. 14, in a third preferred embodiment of the present invention, the supporting seat 3 is not provided with a guiding sliding groove, and therefore, has no corresponding accommodating cavity structure, and the outer surface directly serves as a guiding surface for guiding the sliding member 4 to move axially. At this time, the slider 4 is wrapped around the outer periphery of the holder 3, and the saw blade 2 is accommodated in the accommodating groove 3 h.

Referring to fig. 15, in a fourth preferred embodiment of the present invention, the third elastic member 6c2 is provided as a steel spring having an L-shaped configuration in which one side thereof is connected to the inside of the operating portion 6e of the operating member 6. The third elastic element 6c2 may be fixedly connected to the operating element 6, for example by being embedded or glued, or may be provided separately, and is mounted directly against the operating element 6 and the slider 4.

Referring to fig. 16, in a fifth preferred embodiment of the invention, the elastic element 6c3 is provided as a compression spring, which is received in a blind hole provided in the slider 4 and abuts against the inner wall 6h of the operating portion 6e of the operating element 6.

Referring to fig. 17, in another embodiment of the invention, the operating element 6' further comprises a lever 61. The one-way clutch 5 comprises a stop ramp 4f 'provided on the bearing block 3, a stop element 7 provided between the stop ramp 4 f' and the slide 4 ', and a second elastic element 8 abutting between the slide 4' and the stop element 7. The stop slope 4 f' is inclined in the opposite direction to the pressing slope 4 e. The slider 4 ' is provided with a slide 4m for accommodating a slide portion 6e ' of the operating element 6 '. The operating member 6 ' is pushed in the direction indicated by the arrow a shown in the drawing, and the sliding portion 6e ' of the operating member 6 ' pushes the lever 61 to rotate in the direction of the arrow B about the pivot 62. The end 63 of the lever 61 against the stop element 7 pushes the stop element 7 to move against the force of the second elastic element 8. Thereby disengaging from the stop ramp 4 f'.

Taking the first preferred embodiment as an example, the pressing element 9 is placed in the receiving hole 3b of the bearing block 3 when the blade clamping mechanism 1 is assembled. The extension foot 6a of the operating element 6 projects into the opening 4c in the slide 4. The third elastic element 6c1 abuts against the second step surface 4h provided on the rear portion 4j of the slider 4. The rear part 4j of the slider 4 is housed in the housing cavity 3a of the support base 3, and the side wings 4d axially move along the slide grooves formed in the vertical wall lateral walls of the support base 3. The one-way clutch 5 is accommodated in a space formed by a stop inclined surface 4f on the sliding member 4 and the surface of the supporting seat middle part 3f, one end of the stop element 7 is abutted against the tip of the extension leg 6a of the operating element 6, and the other end is abutted against the second elastic element 8. The annular middle part 4a of the sliding part 4 is sleeved on the periphery of the supporting seat middle part 3f, and the outer end surface of the sliding part abuts against the first elastic element 12. The main body of the pressing plate 10 is disposed in the housing groove 3h, and the guide portion 10a is disposed outside the housing groove 3 h. A second elastic pin 16 penetrates through a positioning hole 3e formed in the middle part 3f of the supporting seat and penetrates through a through hole 10c in the pressing plate 10 to relatively fix the pressing plate 10. The positioning pin 15 passes through the pin hole 3i on the supporting seat 3, and partially extends into the accommodating groove 3h to match with the small hole 2b on the saw blade 2.

As shown in fig. 6 and 7, the slider 4 is in the initial position by the restoring force of the first elastic element 12. The distance between the end face of the annular intermediate portion 4a of the slider 4 and the washer 13 is S1, the operating element 6 is in the distal position by the third elastic element 6c1, and the inner side wall 6h of the operating portion 6e of the operating element 6 is at a distance L1 from the first step face 4g on the slider 4. The distance between the stop ramp 4f and the stop element 7 is 0.

When the saw blade 2 is being clamped, the operating element 6 is first pushed so that it moves in the direction X against the force of the third resilient element 6c1, the tip 6b of the extension leg 6a of the operating element 6 being in contact with the surface of the stop element 7. As shown in fig. 8 and 9, the extension leg 6a pushes the stopper member 7 to be disengaged from the stopper slope 4f against the urging force of the second elastic member 8, and the interval between the stopper member 7 and the stopper slope 4f is δ > 0. Thus, the restraint between the bearing block 3 and the slider 4 is released, and the slider 4 can move in the axial direction with respect to the bearing block 3. At this time, the pressing member 9 and the pressing slope 4e are still in a pressing state.

The operating member 6 is pushed on, and when the inner wall 6h of the operating portion 6e of the operating member 6 abuts on the first step surface 4g on the slider 4, the distance therebetween is L2, the interval between the stopper member 7 and the stopper inclined surface 4f is δ > 0, and the distance between the end surface of the annular middle portion 4a of the slider 4 and the spacer 13 is S1. Further pushing of the operating element 6 pushes the slider 4 to move in the X-direction against the force of the first elastic element 12. Thus, as shown in fig. 10 and 11, the distance between the end surface of the annular middle portion 4a of the slider 4 and the spacer 13 is S2, and the pressing member 9 is disengaged from the pressing slope 4e on the slider 4 and is located in the housing space 41 formed by the slider rear portion 4 j. At this time, the pressure receiving surface 2a of the saw blade 2 is no longer subjected to the radial pressure of the pressure plate 10 and can be easily pulled out or inserted. When the saw blade 2 is inserted into the receiving groove 3h, the end notch 2c corresponds to the position of the second elastic pin 16, and the small hole 2b passes through the positioning pin 15 located in the receiving groove 3h, so that the saw blade 2 is axially fixed with respect to the supporting seat 3. The lower end surface of the main body of the pressure plate 10 is in contact with the pressure surface 2a of the saw blade.

The operating element 6 is released and, under the action of the third elastic element 6c1, the operating element 6 returns axially, and, under the action of the return force of the first elastic element 12, the slider 4 returns to the initial position and the stop element 7 comes back against the stop ramp 4f under the action of the second elastic element 8. The pressing element 9 abuts against the pressing slope 4e, so that the pressing element 9 exerts a radial pressure on the pressing plate 10, pressing the saw blade 2.

Accordingly, in another embodiment of the present invention, the operating element 6 'is pushed in the direction indicated by the arrow a so that the sliding portion 6 e' moves in the slide 4m of the slider 4 ', and the lever 61 is pushed to rotate about the pivot 62, and the stopper element 7 is pushed to disengage from the stopper slope 4 f'. Further pushing of the operating element 6 ' against the slide 4 ' causes the slide 4 ' to slide in the direction of insertion of the saw blade relative to the bearing block 3 against the force of the first elastic element 12. At this point, the blade 2 is inserted into the housing groove 3h, the slider 4' is released, the stop device returns to the initial position, and the pressing element 9 radially clamps the blade 2 under the effect of the pressing ramp 4 e. The third elastic element is not shown in the figures, but it will be understood by those skilled in the art that an elastic element may be provided between the operating element 6 'and the slider 4' to allow it to return automatically when it is released. By providing a torsion spring, the lever 61 can be automatically returned to the initial position.

The above-described examples are merely provided as the most preferred embodiments for those skilled in the art to understand the present invention. The invention is not limited to the specific embodiments described above. Any modifications readily attainable by one versed in the art are to be included within the scope of the present invention.

Claims

1. A saw blade clamping mechanism (1) comprising: the saw blade locking device is characterized by comprising a supporting seat (3) provided with a saw blade containing groove (3h), a sliding piece moving relative to the supporting seat (3) along the reciprocating motion direction of the saw blade, a first elastic element (12) abutted against the sliding piece, a pressing element (9) arranged between the sliding piece and the containing groove (3h), and a stopping device arranged between the sliding piece and the supporting seat (3), wherein the stopping device comprises an operating element and a one-way clutch (5), and the operating element can move relative to the one-way clutch (5) so as to allow the sliding piece to move relative to the supporting seat (3).

2. Saw blade clamping mechanism (1) according to claim 1, wherein said one-way clutch (5) comprises a stop ramp provided on one of said slide and abutment, a stop element (7) provided between said stop ramp and the other of said slide and abutment (3), and a second elastic element (8) abutting between said stop element (7) and the slide.

3. Saw blade clamping mechanism (1) according to claim 2, characterized in that the slide comprises a pressing ramp (4e) against the pressing element (9), the pressing ramp (4e) being inclined in the opposite direction to the stop ramp.

4. Saw blade clamping mechanism (1) according to claim 2 or 3, wherein the stop ramp is provided inside the slide.

5. Saw blade clamping mechanism (1) according to claim 2 or 3, wherein the stop element (7) is rollably in and out of contact with a stop ramp.

6. Saw blade clamping mechanism (1) according to claim 1, characterized in that a third resilient element (6c1, 6c2, 6c3) is provided between the operating element and the slide.

7. The saw blade clamping mechanism (1) according to claim 1, wherein a pressure plate (10) is arranged in the accommodating groove (3h), and a boss (10b) arranged on the pressure plate (10) is contacted with the pressing element (9).

8. A method for clamping a saw blade by applying the saw blade clamping mechanism (1) according to claim 1, characterized in that the stop means is pushed in the direction of insertion of the saw blade, the slide element slides relative to the bearing block (3) against the force of the first elastic element (12) in the direction of insertion of the saw blade into the receiving slot (3h), the saw blade (2) is inserted into the receiving slot (3h), the slide element is released, the stop means returns to the initial position, and the pressing element (9) radially clamps the saw blade (2).

9. Method for clamping a saw blade according to claim 8, characterized in that, when the stop device is pushed, the operating element is pushed first against the force of the third spring element (6c1, 6c2, 6c3) and the stop element (7) is released from the stop ramp against the force of the second spring element (8).