Saw blade clamping device and jigsaw

Abstract

The present invention relates to a saw blade clamping device and a jigsaw. The saw blade clamping device is used for detachably clamping a saw blade. The saw blade clamping device includes a clamping column assembly, a mounting shell assembly, an elastic assembly and two clamping pins. The mounting shell assembly is slidably connected to the end of the clamping column assembly. The mounting shell assembly is provided with guide slides arranged opposite to each other. The two ends of the elastic assembly elastically push against the mounting shell assembly and the clamping column assembly respectively. The clamping pins slide and converge along the first sliding hole, the second sliding hole and the guide slide under the elastic push of the elastic assembly. The minimum spacing between the two clamping pins is less than the thickness of the saw blade. The mounting shell assembly moves toward the saw blade opening under the elastic preload of the elastic assembly. Accordingly, the two clamping pins move toward the saw blade opening under the drive of the mounting shell assembly and move closer under the drive of the first sliding hole and the second sliding hole, so that the two clamping pins can clamp the two sides of the saw blade, which not only has a large clamping area.

Description

Technical Field

[0001] The present invention relates to the technical field of sawing devices, and in particular to a saw blade clamping device and a jigsaw. Background Art

[0002] A jig saw is a power tool with a reciprocating blade that is used to cut curves of different shapes. Jig saws are used to cut metals and non-ferrous metals, and their blade design allows them to handle these materials efficiently. Carbon steel jig saws are suitable for cutting wood and non-metallic materials, while high-speed steel jig saws are more suitable for non-ferrous metals. Jig saws are also commonly used to cut wood and other wood products, including furniture making, model making, etc. Its narrow and flexible blade design allows it to easily cope with the cutting needs of various complex shapes.

[0003] For example, the public document with the announcement number CN216575860U provides a brushless jigsaw that is convenient for blade changing. The saw blade clamping member includes a ball and a spring, the ball and the spring are fixedly connected, and a groove for the ball to be inserted into the inner side of the saw blade reset sleeve is provided, and the saw blade reset sleeve is driven to rotate by rotating the saw blade reset sleeve when the saw is changed, so that the saw blade clamping member clamps or releases the saw blade.

[0004] And the public document with announcement number CN118218673A provides a precision limiting structure of a reciprocating rod of a curved saw, which discloses that a clamping hole is provided on the reciprocating rod, a locking nut is rotatably installed on the reciprocating rod, a saw blade is clamped in the clamping hole, and the locking nut is used to lock the clamping hole.

[0005] The existing jigsaw assembly blade adopts steel balls or fasteners to lock the saw blade. The steel balls have the disadvantages of small contact area and small locking force. The fasteners have the technical problem of difficult assembly and disassembly of the saw blade, so it needs to be improved. Summary of the invention

[0006] In order to overcome the problems existing in the related art, an embodiment of the present invention provides a saw blade clamping device and a jigsaw, which are used to solve the technical problems of small contact area, small locking force, and difficulty in disassembling and assembling the saw blade.

[0007] According to a first aspect of an embodiment of the present invention, there is provided a saw blade clamping device for detachably clamping a saw blade, the saw blade clamping device comprising a clamping column assembly, a mounting shell assembly, an elastic assembly and two clamping pins, the mounting shell assembly being slidably connected to the end of the clamping column assembly;

[0008] The clamping column assembly comprises a central cavity, a saw blade opening at one end of the central cavity, and a first sliding hole and a second sliding hole laterally penetrating the clamping column assembly, wherein the first sliding hole and the second sliding hole are long holes, and one end of the first sliding hole and one end of the second sliding hole gradually approach the direction of the saw blade opening;

[0009] One of the clamping pins passes through the first sliding hole, and the other clamping pin passes through the second sliding hole;

[0010] The mounting shell assembly is provided with guide slots arranged opposite to each other, the length direction of the guide slots intersects with the opening direction of the saw blade opening, and the two ends of the clamping pin are respectively slidably restricted in the guide slots;

[0011] The two ends of the elastic component elastically push against the mounting shell component and the clamping column component respectively, and the clamping pin slides and aggregates along the first sliding hole, the second sliding hole and the guide groove under the elastic push of the elastic component, and the minimum spacing between the two clamping pins is less than the thickness of the saw blade.

[0012] In one embodiment, one end of the first sliding hole and one end of the second sliding hole are connected to form a sliding space, and a guide protrusion is formed in the area between the first sliding hole and the second sliding hole, and the cross-sectional size of the guide protrusion gradually decreases from the root to the end.

[0013] In one embodiment, the guide protrusion comprises a first guide surface and a second guide surface opposite to each other, wherein the first guide surface and the second guide surface are planes, and the taper angle of the guide protrusion is 5 degrees to 20 degrees; or,

[0014] The first guide surface and the second guide surface are convex or concave curved surfaces to adjust the minimum spacing value between the two clamping pins.

[0015] In one embodiment, the mounting shell assembly comprises a sliding sleeve sliding on the clamping column assembly and a cover shell snap-connected to the sliding sleeve, the sliding sleeve is provided with a guide sliding hole, the clamping pin is inserted into the clamping column assembly along the guide sliding hole, and the end of the clamping pin is mounted and limited to the guide sliding hole;

[0016] The cover shell closes the opening of the guide sliding hole, and the guide sliding hole and the cover shell form the guide sliding groove.

[0017] In one embodiment, the sliding sleeve is provided with at least one concave elastic groove, the clamping column assembly is provided with a mounting groove adapted to the elastic groove, the elastic groove and the mounting groove are combined to form an elastic space, and the elastic assembly is located in the elastic space.

[0018] In one embodiment, the clamping pin is cylindrical, strip-shaped or long column-shaped.

[0019] In one embodiment, the clamping column assembly includes a clamping end, the central cavity is arranged at the clamping end, the saw blade opening passes through the end surface of the clamping end to the central cavity, the inner cavity wall of the central cavity is provided with a positioning portion, the positioning portion is provided with at least one inclined guide bevel, and the guide bevel and the saw blade opening are arranged relative to each other.

[0020] In one embodiment, the clamping column assembly also includes a guide column fixed to the clamping end and a driving rail fixed to the guide column, the guide column and the driving rail intersect, the driving rail is used to connect to the cam driving mechanism, and the guide column guides the clamping end to move back and forth in a straight line.

[0021] In one embodiment, the minimum distance between the two clamping pins is set to 0 mm-5 mm.

[0022] According to a second aspect of an embodiment of the present invention, a jigsaw is provided, comprising an electric saw device and a saw blade clamping device as described above, wherein the electric saw device is provided with a cam driving mechanism and a sliding mechanism, the clamping column assembly is slidably connected to the sliding mechanism, the cam driving mechanism is connected to the clamping column assembly, and the mounting shell assembly is spaced apart from the shell of the electric saw device by a preset movable spacing.

[0023] The technical solution provided by the embodiment of the present invention may include the following beneficial effects: the mounting shell assembly moves toward the saw blade opening under the elastic preload of the elastic assembly, and accordingly, the two clamping pins move toward the saw blade opening under the drive of the mounting shell assembly and move closer under the drive of the first sliding hole and the second sliding hole, so that the two clamping pins can clamp both sides of the saw blade, which not only has a large clamping area, but also the two clamping pins always maintain a clamping state under the action of the elastic force, and the clamping is convenient. The mounting shell assembly moves along the clamping column assembly to separate the two clamping pins, which is convenient for inserting the saw blade. Even the saw blade can be directly inserted between the two clamping pins for direct insertion and assembly, thereby improving the convenience of assembly.

[0024] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] Figure 1 The present invention is a schematic structural diagram showing a saw blade clamping device for installing a saw blade according to an embodiment.

[0027] Figure 2The figure is a schematic cross-sectional view of a saw blade clamping device according to an embodiment.

[0028] Figure 3 The figure shows a bottom structure diagram of a saw blade clamping device according to an embodiment.

[0029] Figure 4 The figure is an exploded schematic diagram showing a saw blade clamping device according to an embodiment.

[0030] Figure 5 is a schematic cross-sectional view showing a clamping column assembly according to an embodiment.

[0031] Figure 6 The figure is a cross-sectional schematic diagram showing a clamping column assembly clamping and fixing a saw blade according to an embodiment.

[0032] Figure 7 is a schematic diagram showing a jig saw according to an embodiment.

[0033] Figure 8 It is a schematic diagram showing the connection between a saw blade clamping device and a cam driving mechanism according to an embodiment.

[0034] In the figure, the mounting shell assembly 10; the sliding sleeve 11; the guide slide groove 111; the reinforcing rib 112; the buckle step 113; the guide slide hole 114; the cover shell 12; the avoidance groove 121; the undercut 122; the clamping column assembly 20; the clamping end 21; the saw blade opening 22; the avoidance cavity 221; the driving guide rail 222; the first sliding hole 23; the second sliding hole 24; the guide protrusion 25; the first guide surface 251; the second guide surface 252; the guide Inclined surface 253; guide hole 26; mounting groove 27; step hole 28; guide column 29; elastic component 30; elastic space 31; clamping pin 40; ejection mechanism 50; ejection member 51; positioning cone hole 511; compression spring 52; saw blade 60; extension section 61; lower guide seat 70; lower guide hole 71; upper guide seat 80; upper guide hole 81; lubricating member 82; housing 90; cam drive mechanism 91; lateral elastic member 92. DETAILED DESCRIPTION

[0035] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0036] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside", etc. appear to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] like Figures 1 to 5 As shown, the present invention provides a saw blade clamping device for detachably clamping a saw blade 60, which is a flat structure. The saw blade clamping device includes a clamping column assembly 20, a mounting shell assembly 10, an elastic assembly 30 and two clamping pins 40, and the mounting shell assembly 10 is slidably connected to the end of the clamping column assembly 20. The saw blade clamping device is installed on a jigsaw, and the saw blade 60 is assembled to the saw blade clamping device to achieve quick and convenient disassembly and assembly.

[0039] The clamping column assembly 20 includes a central cavity and a saw blade opening 22 at one end of the central cavity, and the cavity size of the central cavity is larger than the opening size of the saw blade opening 22. The saw blade opening 22 is a long hole, the width of the saw blade opening 22 is larger than the thickness of the saw blade 60, and the length of the saw blade opening 22 is larger than the width of the saw blade 60. The saw blade 60 can be inserted into the central cavity along the saw blade opening 22, and the two clamping pins 40 clamp the two sides of the saw blade 60 in the central cavity area.

[0040] The clamping column assembly 20 includes a first sliding hole 23 and a second sliding hole 24 that laterally penetrate the clamping column assembly 20. The first sliding hole 23 and the second sliding hole 24 are long holes, and one end of the first sliding hole 23 and one end of the second sliding hole 24 gradually approach each other toward the saw blade opening 22. The first sliding hole 23 and the second sliding hole 24 are approximately V-shaped tracks, wherein one clamping pin 40 passes through the first sliding hole 23, and the other clamping pin 40 passes through the second sliding hole 24. When the two clamping pins 40 move toward the saw blade opening 22, the distance between the two clamping pins 40 decreases to clamp the two sides of the saw blade 60.

[0041] The mounting housing assembly 10 is provided with guide slots 111 arranged opposite to each other, the length direction of the guide slots 111 intersects with the opening direction of the saw blade opening 22, and the two ends of the clamping pin 40 are respectively slidably limited in the guide slots 111. The guide slots 111 can limit the clamping pin 40, and the clamping pin 40 slides along the guide slots 111 in a directional manner to achieve closure and expansion.

[0042] The two ends of the elastic component 30 elastically push against the mounting shell component 10 and the clamping column component 20 respectively. The clamping pin 40 slides and converges along the first sliding hole 23, the second sliding hole 24 and the guide groove 111 under the elastic push of the elastic component 30. The minimum spacing between the two clamping pins 40 is less than the thickness of the saw blade 60.

[0043] The specific working principle is as follows: the mounting shell assembly 10 slides on the clamping column assembly 20, and is suspended and connected to the end of the clamping column assembly 20 through the clamping pin 40. The elastic force of the elastic assembly 30 maintains the tendency to push the mounting shell assembly 10 in the direction of detaching from the clamping column assembly 20, and the two ends of the clamping pin 40 are inserted into the guide slots 111 of the mounting shell assembly 10, and the mounting shell assembly 10 drives the clamping pin 40 to slide along the hole wall of the first sliding hole 23 and the hole wall of the second sliding hole 24, and the two clamping pins 40 always maintain a tendency to move closer to clamp the saw blade 60 or move closer to each other. The mounting shell assembly 10, the elastic assembly 30, the clamping pin 40, the first sliding hole 23 and the second sliding hole 24 cooperate with each other and are linked to each other to form a quick clamping structure, and no other tools are required for use.

[0044] Preferably, the clamping pin 40 is cylindrical, strip-shaped or long column-shaped. Optionally, when the clamping pin 40 is a cylindrical pin, it can slide flexibly in the first sliding hole 23 and the second sliding hole 24, and rolling friction can be formed when the saw blade 60 is inserted to reduce resistance. Optionally, the clamping pin 40 is in the shape of a strip, and the clamping pin 40 has a clamping surface, which closes and clamps the saw blade 60, which can increase the clamping area and prevent the saw blade 60 from running. Optionally, the clamping pin 40 is in the shape of a long column, and the clamping pin 40 can be provided with a clamping surface, and the clamping surface can be provided with a wear-resistant texture or a convex point structure that improves the friction effect, thereby improving the friction clamping effect. Further preferably, the above-mentioned clamping pin 40 structures can be used in combination.

[0045] like Figures 1 to 5As shown, the mounting shell assembly 10 moves toward the saw blade opening 22 under the elastic preload of the elastic assembly 30. Accordingly, the two clamping pins 40 move toward the saw blade opening 22 under the drive of the mounting shell assembly 10 and move closer under the drive of the first sliding hole 23 and the second sliding hole 24, so that the two clamping pins 40 can clamp the two sides of the saw blade 60. Not only is the clamping area large, but also the two clamping pins 40 always maintain a clamping state under the elastic force, and the clamping stability is good. The mounting shell assembly 10 moves along the clamping column assembly 20 to separate the two clamping pins 40, making it easier to insert the saw blade 60. Even more, the elastic assembly 30 can adjust the appropriate elastic preload, so that the saw blade 60 can be directly inserted between the two clamping pins 40 along the saw blade opening 22 on the basis of the two clamping pins 40 effectively clamping the saw blade 60, so as to form a direct insertion assembly, thereby improving the convenience of assembly.

[0046] The first sliding hole 23 and the second sliding hole 24 are arranged relatively inclined, wherein the first sliding hole 23 and the second sliding hole 24 are elongated hole structures with one end gradually approaching each other, and the elongated hole can be arranged as a straight hole or a curved hole. Optionally, the ends of the first sliding hole 23 and the second sliding hole 24 are separated by a wall on the clamping column assembly 20 to form two independent hole structures.

[0047] In a preferred embodiment, one end of the first sliding hole 23 and one end of the second sliding hole 24 are connected to form a sliding space, and one end of the first sliding hole 23 and one end of the second sliding hole 24 are intersected and connected, and the sliding space forms a space approximately in a V shape. Therefore, the two clamping pins 40 can abut against each other in the sliding space, so as to flexibly clamp saw blades 60 of different thicknesses. Therefore, the minimum spacing between the two clamping pins 40 is set to 0mm-5mm. For example, the minimum spacing between the two clamping pins 40 is set to 0mm (fitting each other), 0.3mm, 0.5mm, 0.8mm, 1mm, 2mm, 2.8mm, 3.8mm, 4.8mm, 5mm. The thickness of the saw blade 60 is greater than the minimum spacing between the two clamping pins 40, so that the saw blade 60 is clamped by the two clamping pins 40 after insertion.

[0048] Furthermore, a guide protrusion 25 is formed in the area between the first sliding hole 23 and the second sliding hole 24, and the cross-sectional size of the guide protrusion 25 gradually decreases from the root to the end. The wall space between the first sliding hole 23 and the second sliding hole 24 forms the guide protrusion 25, and the hole wall of the first sliding hole 23 and the hole wall of the second sliding hole 24 constitute the two side surfaces of the guide protrusion 25.

[0049] like Figures 4 to 8As shown, the guide protrusion 25 guides the two clamping pins 40, and the mounting shell assembly 10 drives the clamping pins 40 to move. Specifically, the two clamping pins 40 move toward the tip of the guide protrusion 25 to gradually approach until they clamp the saw blade 60. Alternatively, the two clamping pins 40 move toward the root of the guide protrusion 25 to gradually separate, and the saw blade 60 can be pulled out.

[0050] In one embodiment, the guide protrusion 25 includes a first guide surface 251 and a second guide surface 252 relative to each other, wherein the first guide surface 251 and the second guide surface 252 are planes, and the taper angle of the guide protrusion 25 is 5 degrees to 20 degrees. The first guide surface 251 and the second guide surface 252 are arranged as inclined plane structures, and the guide protrusion 25 is a triangular cantilever boss structure. Preferably, the end of the guide protrusion 25 is provided with an arc angle to improve the sliding flexibility. The taper angle of the guide protrusion 25 can be set to 5 degrees, 8 degrees, 10 degrees, 11 degrees, 12 degrees, 13 degrees, 15 degrees, 18 degrees, and 20 degrees. Different taper angles can flexibly adjust the speed of change of the spacing size between the two clamping pins 40, thereby expanding the clamping range of the saw blade 60.

[0051] In one embodiment, the first guide surface 251 and the second guide surface 252 are convex or concave curved surfaces to adjust the minimum spacing value of the two clamping pins 40. If the first guide surface 251 and the second guide surface 252 are concave curved surfaces, the depressions of the first guide surface 251 and the second guide surface 252 converge, and the cross-sectional change rate of the guide protrusion 25 is fast, which can guide the clamping pin 40 to quickly clamp the saw blade 60. The first guide surface 251 and the second guide surface 252 are set as convex curved surfaces. Accordingly, the first guide surface 251 and the second guide surface 252 gradually converge, and the cross-sectional change rate of the guide protrusion 25 is small, which can guide the clamping pin 40 to finely change the clamping of the saw blade 60. The first guide surface 251 and the second guide surface 252 are curved, and the clamping effect of the clamping pin 40 can be adjusted.

[0052] like Figures 4 to 8 As shown, the mounting shell assembly 10 limits the clamping pin 40 and is connected to the clamping column assembly 20 to maintain a good connection and matching effect. Among them, the clamping column assembly 20 includes a clamping end 21, a central cavity is arranged at the clamping end 21, and a saw blade opening 22 passes through the end face of the clamping end 21 to the central cavity. The clamping end 21 is a rectangular column, a chamfered column or a column structure with an anti-rotation plane, and the mounting shell assembly 10 is slidably mounted on the clamping end 21 to form an axial reciprocating sliding, but cannot rotate relative to each other. The central cavity and the saw blade opening 22 are approximately a step hole structure, and the saw blade opening 22 is a long hole structure. The central cavity can be set as a circular hole, a rectangular hole or other cavity structures. The clamping end 21 can be processed by welding multiple parts. Alternatively, the clamping end 21 is processed by metal material, such as casting, cutting or powder processing.

[0053] The inner cavity wall of the central cavity is provided with a positioning portion, and the positioning portion is provided with at least one inclined guiding bevel 253, and the guiding bevel 253 and the saw blade opening 22 are arranged opposite to each other. The positioning portion is located at the other end of the central cavity, and the positioning portion is used to limit and position the insertion end of the saw blade 60 to keep the insertion position of the saw blade 60 accurate. Preferably, the guiding bevel 253 is located in the reverse extension direction of the saw blade opening 22, and two guiding bevels 253 are provided, and the spacing between the two guiding bevels 253 is less than the length of the saw blade opening 22. At the same time, the spacing between the two guiding bevels 253 is less than the maximum width of the insertion end of the saw blade 60, so as to realize the positioning and correction of the insertion end of the saw blade 60.

[0054] Further preferably, the clamping end 21 has a guide hole 26 between the two guide slopes 253, the guide hole 26 is coaxially arranged with the saw blade opening 22, and the length of the guide hole 26 is smaller than the length of the saw blade opening 22. When the insertion end of the saw blade 60 is provided with an extension section 61, the extension section 61 can be inserted into the guide hole 26, thereby improving the installation accuracy of the saw blade 60 and lengthening the matching length of the clamping column assembly 20 and the saw blade 60. Further preferably, the guide slope 253 is arranged on the inner side of the guide protrusion 25.

[0055] Preferably, the clamping column assembly 20 further includes a guide column 29 fixed to the clamping end 21, the guide column 29 is provided with a cavity 221, and the guide hole 26 is smaller than or equal to the opening size of the cavity 221. The extension section 61 of the saw blade 60 can be inserted into the cavity 221 from the guide hole 26, thereby improving the insertion depth of the saw blade 60 and the stability during processing.

[0056] Furthermore, the clamping column assembly 20 further includes an ejection mechanism 50 installed in the guide column 29, and the ejection mechanism 50 is slidably limited in the avoidance cavity 221, and is used to elastically push the end of the saw blade 60 to push the saw blade 60 out of the saw blade clamping device. Optionally, the ejection mechanism 50 includes a compression spring 52 and a push piece 51 sliding in the avoidance cavity 221, and the compression spring 52 elastically pushes the push piece 51 to move toward the guide hole 26, so that the end surface of the extension section 61 is subjected to an elastic preload force toward the end of the extension section 61.

[0057] The ejection mechanism 50 has the function of stabilizing the installation position of the saw blade 60 and pushing the saw blade 60 out of the clamping device when the clamping pin 40 is unlocked to lock the saw blade 60. When the clamping pin 40 locks both sides of the saw blade 60, the ejection mechanism 50 elastically pushes the saw blade 60, and can cooperate with the elastic component 30 to form an elastic pre-pressure, further improving the locking effect of the clamping pin 40 on the saw blade 60, and avoiding floating or sliding.

[0058] Further preferably, the push member 51 is provided with a concave positioning tapered hole 511, and the positioning tapered hole 511 faces the direction of the guide hole 26. The end of the saw blade 60 is set to be conical to be inserted into the positioning tapered hole 511, so as to achieve matching positioning.

[0059] like Figures 4 to 8 As shown, the mounting shell assembly 10 is slidably mounted on the clamping column assembly 20 and guides the two clamping pins 40 to slide. The mounting shell assembly 10 includes a sliding sleeve 11 that slides on the clamping column assembly 20. The sliding sleeve 11 is sleeved on the clamping end 21 and slides with the outer peripheral wall of the clamping end 21, thereby forming an axial guide sliding structure.

[0060] The sliding sleeve 11 is provided with a guide slide hole 114, and the clamping pin 40 is inserted into the clamping column assembly 20 along the guide slide hole 114, and the end of the clamping pin 40 is mounted and limited in the guide slide hole 114. The guide slide hole 114 is a long hole structure, and the length direction of the guide slide hole 114 intersects with the length direction of the first slide hole 23 and the second slide hole 24, so that the clamping pin 40 can slide both longitudinally and transversely to achieve the action of clamping and releasing the saw blade 60.

[0061] During the installation of the clamping pin 40, the sliding sleeve 11 is moved until the guide sliding hole 114 is aligned with the first sliding hole 23 and the second sliding hole 24, and then the clamping pin 40 is inserted into the guide sliding hole 114 and the corresponding first sliding hole 23 and second sliding hole 24, and the end of the clamping pin 40 is limited to the guide sliding hole 114. After the sliding sleeve 11 is loosened, the clamping pin 40 is clamped to the sliding sleeve 11 and the clamping end 21 under the push of the elastic component 30.

[0062] Further, the mounting shell assembly 10 includes a cover shell 12 snap-connected to the sliding sleeve 11, the cover shell 12 closes the opening of the guide slide hole 114, and the guide slide hole 114 and the cover shell 12 form a guide slide groove 111. The cover shell 12 is sleeved outside the sliding sleeve 11 and snap-connected to the sliding sleeve 11, thereby closing the guide slide hole 114 to prevent the clamping pin 40 from detaching from the sliding sleeve 11. Preferably, the guide slide hole 114 passes through one side wall of the sliding sleeve 11 and forms a groove on the other side wall, thereby limiting the end position of the clamping pin 40.

[0063] Preferably, the outer peripheral wall of the sliding sleeve 11 is provided with a plurality of reinforcing ribs 112, and a snap step 113 is formed between two reinforcing ribs 112. The cover shell 12 is provided with avoidance grooves 121 complementary to the reinforcing ribs 112, and an undercut 122 is provided at the raised portion between the avoidance grooves 121. The cover shell 12 is sleeved on the sliding sleeve 11, so that the undercut 122 is snap-connected to the snap step 113, thereby forming a quick assembly.

[0064] Further, the sliding sleeve 11 is provided with at least one elastic groove which is concave, and the clamping column assembly 20 is provided with a mounting groove 27 which is adapted to the elastic groove, and the elastic groove and the mounting groove 27 are combined to form an elastic space 31, and the elastic assembly 30 is located in the elastic space 31. The elastic assembly 30 is provided as a spring, and the spring is provided between the sliding sleeve 11 and the clamping end 21. Boss structures are provided in both the elastic groove and the mounting groove 27, and the boss structures can respectively define one end of the elastic assembly 30, so as to achieve abutment positioning.

[0065] In one embodiment, the clamping column assembly 20 further includes a driving rail 222 fixed to the guide column 29, the guide column and the driving rail 222 intersect, the driving rail 222 is used to connect the cam driving mechanism 91, and the guide column 29 guides the clamping end 21 to move back and forth in a straight line. A step hole 28 is provided on the clamping end 21, and the guide column 29 is plugged into the step hole 28 to form a plug-in fit positioning. The guide column 29 and the clamping end 21 can be connected by welding, locking connection with fasteners, or interference plug-in fit connection.

[0066] like Figures 4 to 8 As shown, the driving guide rail 222 is fixed to the guide column 29, and the length direction of the driving guide rail 222 is perpendicular to the guide column 29. The driving guide rail 222 is used to connect the cam driving mechanism 91 on the jigsaw, and moves back and forth in a straight line under the drive of the cam driving mechanism 91. The driving guide rail 222 includes a penetrating sliding groove, which is set as a T-shaped groove, a dovetail groove, or a rectangular groove.

[0067] The saw blade clamping device disclosed in the above embodiment is applied to a jigsaw, wherein the jigsaw includes an electric saw device and a saw blade clamping device as disclosed in the above embodiment, the electric saw device is provided with a cam drive mechanism 91 and a sliding mechanism, and the clamping column assembly 20 is slidably connected to the sliding mechanism. The cam drive mechanism 91 is connected to the clamping column assembly 20, and the mounting shell assembly 10 is spaced from the housing of the electric saw device by a preset movable spacing. The sliding mechanism is used to limit the sliding direction and sliding trajectory of the clamping column assembly 20, so that the guide column 29 guides the entire clamping column assembly 20 to move back and forth in a straight line.

[0068] Optionally, the electric saw device is provided with a housing 90, and the sliding mechanism includes an upper guide seat 80 and a lower guide seat 70 fixed in the housing 90 at intervals, and the upper guide seat 80 is provided with an upper guide hole 81, and the upper guide hole 81 and the guide column 29 are slidably matched, and an anti-rotation surface for limiting rotation is provided. The lower guide seat 70 is provided with a lower guide hole 71, and there is a floating gap between the lower guide hole 71 and the guide column 29. The floating gap is provided around the guide column 29, wherein the floating gap at any point is less than 1 mm, so as to constitute a floating limit.

[0069] The upper guide seat 80 and the lower guide seat 70 guide and limit the guide column 29 at intervals to form a directional movement, and the driving guide rail 222 is located between the upper guide seat 80 and the lower guide seat 70. The lower guide hole 71 realizes floating positioning to improve the flexibility of the reciprocating sliding of the clamping column assembly 20 and reduce resistance. Preferably, the upper guide seat 80 is installed with a lubricating member 82, and the lubricating member 82 is embedded in the upper guide hole 81. The guide column 29 and the lubricating member 82 are slidably matched, which can not only improve the sliding flexibility, but also maintain a suitable matching clearance. The lubricating member 82 can be a copper sleeve, a plastic sleeve or a ceramic sleeve.

[0070] Furthermore, the sliding mechanism also includes a lateral elastic member 92 installed on the housing 90. The lateral elastic member 92 is close to one side of the lower guide seat 70 and elastically pushes the guide column 29 to keep the lateral clearance of the guide column 29 stable and achieve elastic reset.

[0071] The cam driving mechanism 91 is installed on the housing 90, and the cam driving mechanism 91 includes a driving wheel and a cam shaft eccentrically installed on the driving wheel, and the cam shaft is inserted into the sliding groove. When the driving wheel rotates, the cam shaft drives the clamping column assembly 20 to move back and forth in a straight line.

[0072] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0073] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A saw blade clamping device for detachably clamping a saw blade, characterized in that: The saw blade clamping device comprises a clamping column assembly, a mounting shell assembly, an elastic assembly and two clamping pins, wherein the mounting shell assembly is slidably connected to the end of the clamping column assembly; The clamping column assembly comprises a central cavity, a saw blade opening at one end of the central cavity, and a first sliding hole and a second sliding hole laterally penetrating the clamping column assembly, wherein the first sliding hole and the second sliding hole are long holes, and one end of the first sliding hole and one end of the second sliding hole gradually approach the direction of the saw blade opening; One of the clamping pins passes through the first sliding hole, and the other clamping pin passes through the second sliding hole; The mounting shell assembly is provided with guide slots arranged opposite to each other, the length direction of the guide slots intersects with the opening direction of the saw blade opening, and the two ends of the clamping pin are respectively slidably restricted in the guide slots; The two ends of the elastic component elastically push against the mounting shell component and the clamping column component respectively, and the clamping pin slides and converges along the first sliding hole, the second sliding hole and the guide slide groove under the elastic push of the elastic component, and the minimum distance between the two clamping pins is less than the thickness of the saw blade; The mounting shell assembly comprises a sliding sleeve sliding on the clamping column assembly and a cover shell snap-connected to the sliding sleeve, the sliding sleeve is provided with a guide sliding hole, the clamping pin is inserted into the clamping column assembly along the guide sliding hole, and the end of the clamping pin is mounted and limited to the guide sliding hole; The cover shell closes the opening of the guide sliding hole, and the guide sliding hole and the cover shell form the guide sliding groove; The sliding sleeve is provided with at least one inwardly concave elastic groove, the clamping column assembly is provided with a mounting groove adapted to the elastic groove, the elastic groove and the mounting groove are closed to form an elastic space, and the elastic assembly is located in the elastic space; The clamping column assembly includes a clamping end, a guide column fixed to the clamping end, and an ejection mechanism installed in the guide column. The guide column is provided with an air avoidance cavity. The ejection mechanism is slidably limited in the air avoidance cavity and is used to elastically push the end of the saw blade.

2. The saw blade clamping device according to claim 1, characterized in that: One end of the first sliding hole is connected to one end of the second sliding hole to form a sliding space, and a guide protrusion is formed in the area between the first sliding hole and the second sliding hole. The cross-sectional size of the guide protrusion gradually decreases from the root to the end.

3. The saw blade clamping device according to claim 2, characterized in that: The guide protrusion comprises a first guide surface and a second guide surface opposite to each other, wherein the first guide surface and the second guide surface are planes, and the taper angle of the guide protrusion is 5 degrees to 20 degrees; or, The first guide surface and the second guide surface are convex or concave curved surfaces to adjust the minimum spacing value between the two clamping pins.

4. The saw blade clamping device according to claim 1, characterized in that: The clamping pin is in the shape of a cylinder, a strip or a long column.

5. The saw blade clamping device according to claim 1, characterized in that: The central cavity is arranged at the clamping end, and the saw blade opening passes through the end surface of the clamping end to the central cavity. The inner cavity wall of the central cavity is provided with a positioning portion, and the positioning portion is provided with at least one inclined guide slope, and the guide slope and the saw blade opening are arranged opposite to each other.

6. The saw blade clamping device according to claim 5, characterized in that: The clamping column assembly also includes a guide column fixed to the clamping end and a driving rail fixed to the guide column, the guide column and the driving rail intersect, the driving rail is used to connect to the cam driving mechanism, and the guide column guides the clamping end to move back and forth in a straight line.

7. The saw blade clamping device according to claim 1, characterized in that: The minimum distance between the two clamping pins is set to 0mm-5mm.

8. A jigsaw, characterized in that: It comprises an electric saw device and a saw blade clamping device as described in any one of claims 1 to 7, wherein the electric saw device is provided with a cam driving mechanism and a sliding mechanism, the clamping column assembly is slidably connected to the sliding mechanism, the cam driving mechanism is connected to the clamping column assembly, and the mounting shell assembly is spaced apart from the shell of the electric saw device by a preset movable spacing.

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