CN200988117Y

CN200988117Y - Saw blade fastening mechanism

Info

Publication number: CN200988117Y
Application number: CN 200620152387
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: 2006-12-25
Filing date: 2006-12-25
Publication date: 2007-12-12
Anticipated expiration: 2016-12-25

Abstract

The utility model discloses a saw blade clipped mechanism(1), which comprises a fulcrum bearing(3) provided with a saw blade detaining groove(3h), a first elastic element(12) pressed against the sliding part(4) which moves along the direction of the reciprocating motion of the saw blade relatively to the fulcrum bearing(3), and a holddown element(9) which is arranged between the fulcrum bearing(3) and the sliding part(4). In addition, a retaining device is arranged between the sliding part(4) and the fulcrum bearing(3), which prevents the moving trend of the sliding part(4) overcoming the restoring force of the elastic element(12), therefore avoids the risk of the prolapse of the saw blade(2) when the clamping force fails in the process of the high speed motion of the tool.

Description

Saw blade clamping mechanism

Technical Field

The utility model relates to a saw bit clamping mechanism, especially a reciprocal type electric tool's saw bit 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.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can prevent during the high-speed motion of instrument, saw bit clamping mechanism that the saw bit clamp force became invalid.

According to the utility model discloses, a saw bit clamping mechanism, including the bearing that is equipped with the saw bit accepting groove, for the slider that the bearing removed along saw bit reciprocating direction, with the first elastic element that the slider offseted presses and moves it from the release position to compressing tightly the position, locates the slider with compressing tightly the component between the accepting groove, its still including locating the detent between slider and the bearing.

A further aspect of the invention is that the arresting device comprises an operating element and a one-way clutch, the operating element being movable relative to the one-way clutch so as to allow the slide to move relative to the bearing seat. The one-way clutch comprises a stop inclined surface arranged on one of the sliding piece and the supporting seat, a stop element arranged between the stop inclined surface and the other of the sliding piece 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 elements are rolling bodies, in particular cylindrical steel columns, which can be brought into and out of rolling contact with the stop ramps. 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 rolling element, in particular a cylindrical steel column, lying in a receiving bore in the bearing block, the axis of which is parallel to the axis of the locking 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.

Drawings

The 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 supporting base of the present invention;

figure 4 is a cross-sectional view of the support base along its centerline in the present invention;

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

FIG. 6 is a cross-sectional view of the first preferred embodiment of the present invention taken along line A-A of FIG. 2, with the compression member and slide in the original compression 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 cross-sectional view of the first preferred embodiment of the present invention taken along line A-A of FIG. 2, with the operating member pushing the stop member out of engagement with the stop ramp;

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

fig. 10 is a schematic view of the first preferred embodiment of the present invention taken along line a-a of fig. 2, in which the operating member is axially displaced with the slider a certain distance relative to the support base, and the pressing member is 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, in which the operating member is axially displaced with the slider a certain distance relative to the support base, and the pressing member is disengaged from the pressing ramp;

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

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

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

fig. 15 is a schematic view of a fourth preferred embodiment of the present invention, partially cut away along the line D-D in fig. 2;

fig. 16 is a schematic view of a fifth preferred embodiment of the present invention, partially cut away along the line D-D in fig. 2;

fig. 17 is a schematic view of the present invention with the locking ramp disposed on the bearing.

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, the annular middle part 4b of the sliding part 4a is protruded

4c opening 4d flank 4e pressing slope

4f, 4f, a stop slope 4g, a first step surface 4h, and a second step surface

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

4l receiving 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 present invention, the saw blade clamping mechanism 1 includes a supporting seat 3, a slider 4, a pressing member 9, an operating member 6, a stopper member 7, and the like.

Referring to fig. 1 to 12, in a first preferred embodiment of the present invention, the saw blade clamping mechanism 1 includes a supporting base 3 having a saw blade receiving groove 3h, a sliding member 4 moving relative to the supporting base 3 in a direction of reciprocating motion of the saw blade, a pressing member 9 disposed between the sliding member 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 concept of the present invention is to provide a locking device between the slider 4 and the support base 3 to prevent the slider 4 from moving relative to the support base 3 during the 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 other of the slide 4 and the bearing block 3, and a second elastic element 8 abutting between the stop element 7 and the slide 4. When the tool is moved at high speed, the slide 4 tends to move in the direction X relative to the support 3 under the action of the inertia force, and the stop element 7 and the stop ramp 4f tend to engage in such a tendency to limit the movement of the slide 4, thereby preventing the clamping force of the saw blade 2 from being lost. 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 of the pressing plate is bent into the guiding 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 groove, and correspondingly, the rear portion 4j of the sliding member 4 is also formed as a dovetail shape so as to be matched with the receiving cavity 3 a.

Referring to fig. 14, in the third preferred embodiment of the present invention, the supporting seat 3 is not provided with a guiding sliding groove, and therefore, there is no corresponding receiving cavity structure, and its outer surface directly serves as a guiding surface to guide the axial movement of the sliding member 4. 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 formed as a steel spring, and has an L-shaped structure, one side of which is connected to the inside of the operation portion 6e of the operation 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 present invention, the elastic member 6c3 is provided as a compression spring, which is received in a blind hole formed in the slider 4 and abuts against the inner wall 6h of the operating portion 6e of the operating member 6.

Referring to fig. 17, in another embodiment of the present 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 4f 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 operation 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 face 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 4l 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 sliding member 4 ', and the lever 61 is pushed to rotate around the pivot 62, and the stopping element 7 is pushed to disengage from the stopping inclined surface 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 present invention is not limited to the above-described specific embodiments. Any improvement which can be easily conceived by a person skilled in the art is within the inventive concept.

Claims

1. A saw blade clamping mechanism (1) comprising: the saw blade clamping device comprises a supporting seat (3) provided with a saw blade accommodating groove (3h), a sliding piece (4, 4 ') moving along the reciprocating motion direction of the saw blade relative to the supporting seat (3), a first elastic element (12) abutting against the sliding piece (4, 4'), and a pressing element (9) arranged between the sliding piece (4, 4 ') and the accommodating groove (3h), and is characterized by further comprising a stopping device arranged between the sliding piece (4, 4') and the supporting seat (3).

2. Saw blade clamping mechanism (1) according to claim 1, characterized in that the stopping means comprise an operating element (6, 6 ') and a one-way clutch (5), the operating element (6, 6') being movable relative to the one-way clutch (5) so as to allow the slide (4) to move relative to the bearing block (3).

3. Saw blade clamping mechanism (1) according to claim 2, wherein the one-way clutch (5) comprises a stop ramp (4f, 4f ') provided on one of the slide (4) and the abutment (3), a stop element (7) provided between the stop ramp (4f, 4 f') and the other of the slide (4, 4 ') and the abutment (3), and a second resilient element (8) abutting between the stop element (7) and the slide (4, 4').

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

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

6. Saw blade clamping mechanism (1) according to claim 3 or 4, characterized in that the stop element (7) is rollably in and out of contact with the stop ramp (4f, 4 f').

7. Saw blade clamping mechanism (1) according to claim 6, characterized in that the pressing elements (9) are rolling bodies lying in receiving holes (3b) in the bearing block (3) with their axes parallel to the axis of the stop element (7).

8. Saw blade clamping mechanism (1) according to claim 2, characterized in that a third resilient element (6c1, 6c2, 6c3) is provided between the operating element (6) and the slide (4).

9. Saw blade clamping mechanism (1) according to claim 8, characterized in that the third resilient element (6c1, 6c2, 6c3) is integrally formed with the operating element (6).

10. 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).