A saw blade clamping device

Abstract

This invention provides a saw blade clamping device, relating to the field of cutting tool technology. It includes a chuck body with a saw blade mounting position for accommodating a saw blade; a rotating sleeve fitted around the outer periphery of the chuck body in a manner rotatable about the axis of the chuck body; a slider movably disposed within the chuck body along its axial and radial directions, and drivenly connected to the rotating sleeve; and a guide assembly configured to guide the slider along a guide path extending obliquely relative to the axis of the chuck body when the rotating sleeve rotates. The slider is configured to move from a first position of clamping the saw blade to a second position of releasing the saw blade, guided by the guide assembly, in response to the rotation of the rotating sleeve. By having the rotating sleeve drive the slider to move along the oblique guide path, the clamping and releasing actions of the slider can be achieved with a small operating angle or operating force, while ensuring sufficient clearance when releasing the saw blade to avoid interference and scratching with the saw blade.

Description

Technical Field

[0001] This invention relates to the field of cutting tool technology, and more specifically, to a saw blade clamping device. Background Technology

[0002] As a commonly used electric cutting tool, jigsaws typically have a chuck at the end of their reciprocating rod to allow for quick clamping and replacement of the saw blade. Most existing jigsaw chucks employ an eccentric cam clamping or screw-tightening structure. The operator moves a lever or tightens a bolt to drive the clamping block radially towards the back of the saw blade, pressing the blade firmly into the positioning groove of the reciprocating rod. Friction or toothed engagement prevents the saw blade from axially shifting or loosening during operation.

[0003] However, during use, the above structure requires a large operating angle or force to overcome static friction in order to ensure sufficient clamping reliability, resulting in laborious operation and limited stroke. If the operating force is reduced in order to achieve quick release, the pressure block will not be able to retract sufficiently, and the saw blade will easily interfere with and scrape against the pressure block during disassembly and assembly, affecting the smoothness of clamping. Summary of the Invention

[0004] The problem solved by this invention is: how to balance the effortless and reliable clamping of the saw blade with smooth disassembly and assembly.

[0005] To solve the above problems, the present invention provides a saw blade clamping device, comprising:

[0006] The chuck body has a saw blade mounting position for accommodating the saw blade;

[0007] A rotating sleeve is fitted around the outer periphery of the chuck body in a manner that allows it to rotate about the axis of the chuck body;

[0008] A slider is movably disposed within the chuck body along the axial and radial directions, and the slider is drivenly connected to the rotating sleeve.

[0009] A guide assembly is configured to guide the slider along a guide path that extends obliquely relative to the axis of the chuck body as the rotating sleeve rotates;

[0010] The slider is configured to move from a first position pressing the saw blade to a second position releasing the saw blade, guided by the guide assembly, in response to the rotation of the rotating sleeve.

[0011] Optionally, it further includes a first elastic element disposed between the chuck body and the rotating sleeve, and / or, the first elastic element disposed between the chuck body and the slider;

[0012] The first elastic element has a preload force, which is configured to drive the slider to return from the second position to the first position when the rotating sleeve is released.

[0013] Optionally, the upper end of the chuck body is provided with a first limiting block that protrudes circumferentially, and the upper end of the rotating sleeve abuts against the lower end of the first limiting block;

[0014] The lower outer periphery of the chuck body is provided with a circumferentially extending slot, and a retaining ring is engaged in the slot;

[0015] The guide assembly is axially disposed between the retaining ring and the rotating sleeve.

[0016] Optionally, the guide assembly includes a mounting ring and a guide member;

[0017] The mounting ring is sleeved on the outer periphery of the chuck body and is located axially between the retaining ring and the rotating sleeve;

[0018] The guide is connected to the inner circumference of the mounting ring and extends along the axial direction of the chuck body;

[0019] The slider is provided with a guide hole that slides with the guide member to guide the slider to move along the guide path.

[0020] Optionally, the lower end of the chuck body is provided with an installation gap, the installation gap is in communication with the saw blade mounting position, and the slider and the guide are both located within the installation gap;

[0021] There are two guide members, which are arranged opposite each other along the circumference of the mounting ring. Each guide member extends axially upward and radially inward from the inner circumference of the mounting ring.

[0022] There are two sliders, and the two sliders slide in a one-to-one correspondence with the two guide members;

[0023] When the slider is in the first position, the two sliders abut against both sides of the saw blade in the width direction.

[0024] Optionally, the lower inner circumferential wall of the rotating sleeve is provided with a plurality of first oblique teeth distributed in the circumferential direction, and the slider is provided with second oblique teeth that match the first oblique teeth;

[0025] Both the first oblique tooth and the second oblique tooth extend obliquely relative to the axis of the chuck body;

[0026] The rotating sleeve drives the slider to move through the meshing of the first oblique tooth and the second oblique tooth.

[0027] Optionally, the outer periphery of the chuck body is provided with mounting grooves on opposite sides that communicate with the saw blade mounting position, and each mounting groove is provided with a radial clamping element;

[0028] The inner circumferential wall of the rotating sleeve is provided with an eccentric groove corresponding to the radial clamping member;

[0029] When the rotating sleeve rotates, it drives the radial clamping member to move radially within the eccentric groove, so that the two radial clamping members abut against both sides of the saw blade in the thickness direction.

[0030] Optionally, a reciprocating rod is connected to the upper end of the chuck body, and a bushing is provided inside the reciprocating rod;

[0031] The lower end of the bushing is provided with an abutment groove that communicates with the saw blade mounting position, and the abutment groove extends axially.

[0032] When the saw blade is installed in the saw blade mounting position, one axial end of the saw blade abuts against the bottom of the abutment groove to limit the axial displacement of the saw blade.

[0033] Optionally, the reciprocating rod is provided with a second elastic element, which is located at the upper end of the bushing and abuts against the bushing;

[0034] The upper end of the bushing is provided with an axially extending waist-shaped hole, and the reciprocating rod is provided with a positioning pin. The positioning pin passes through the waist-shaped hole, and both ends of the positioning pin are fixedly connected to the reciprocating rod.

[0035] The second elastic element is configured to drive the bushing to move toward the opening of the abutment groove so as to eject the saw blade from the saw blade mounting position when the slider moves to the second position.

[0036] Optionally, the upper inner peripheral wall of the rotating sleeve is provided with a clearance groove, and at least a portion of the first elastic element is accommodated in the clearance groove.

[0037] The beneficial effects of the saw blade clamping device of the present invention are as follows: When the rotating sleeve rotates, the slider, guided by the guide assembly, moves from a first position pressing the saw blade along the combined axial and radial direction to a second position releasing the saw blade. In the first position, the slider applies pressure to the saw blade, fixing it in the saw blade mounting position; when it is necessary to release the saw blade, the rotating sleeve is rotated, the slider moves to the second position, releasing the pressure on the saw blade and thus releasing it. The present invention uses the rotating sleeve to drive the slider along an inclined guide path, enabling the pressing and releasing actions of the slider to be achieved with a smaller operating angle or operating force, making operation more labor-saving. Simultaneously, the slider's movement along the combined axial and radial direction ensures sufficient clearance when releasing the saw blade, avoiding interference and scraping with the saw blade, and making the saw blade clamping process smoother. Attached Figure Description

[0038] Figure 1 An exploded view of a saw blade clamping device according to one embodiment of the present invention;

[0039] Figure 2 A cross-sectional view of a saw blade clamping device in a saw blade clamping state according to one embodiment of the present invention;

[0040] Figure 3 A cross-sectional view of a saw blade clamping device in the saw blade released state according to one embodiment of the present invention;

[0041] Figure 4 This is a three-dimensional structural diagram of the chuck body according to one embodiment of the present invention;

[0042] Figure 5 This is a three-dimensional structural diagram of a guide component and a slider according to one embodiment of the present invention;

[0043] Figure 6 This is a three-dimensional structural diagram of a rotating sleeve according to one embodiment of the present invention;

[0044] Figure 7 for Figure 2 A sectional view along the CC direction;

[0045] Figure 8 for Figure 3 A cross-sectional view along the DD direction.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Chuck body; 11. Saw blade mounting position; 12. First limiting block; 13. Slot; 14. Mounting gap; 15. Mounting groove; 2. Rotating sleeve; 21. First oblique tooth; 22. Eccentric groove; 23. Clearance groove; 3. Slider; 31. Guide hole; 32. Second oblique tooth; 4. Guide assembly; 41. Mounting ring; 42. Guide component; 5. First elastic component; 6. Snap ring; 7. Radial clamping component; 8. Reciprocating rod; 81. Bushing; 811. Abutment groove; 812. Waist-shaped hole; 82. Second elastic component; 83. Positioning pin; 9. Saw blade. Detailed Implementation

[0048] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0049] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0050] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0051] like Figure 1 As shown, an embodiment of the present invention provides a saw blade clamping device, comprising:

[0052] The chuck body 1 is provided with a saw blade mounting position 11 for accommodating the saw blade 9;

[0053] The rotating sleeve 2 is fitted around the outer periphery of the chuck body 1 in a manner that allows it to rotate around the axis of the chuck body 1.

[0054] The slider 3 is movably disposed within the chuck body 1 along the axial and radial directions, and the slider 3 is drivenly connected to the rotating sleeve 2.

[0055] The guide assembly 4 is configured to guide the slider 3 to move along a guide path that extends obliquely relative to the axis of the chuck body 1 when the rotating sleeve 2 rotates.

[0056] The slider 3 is configured to move from the first position of pressing the saw blade 9 to the second position of releasing the saw blade 9 in response to the rotation of the rotating sleeve 2 and guided by the guide assembly 4.

[0057] Specifically, the chuck body 1 serves as the mounting base, and a saw blade mounting position 11 is provided on it to accommodate the saw blade 9, providing space for the installation of the saw blade 9; the rotating sleeve 2 is loosely fitted outside the chuck body 1 and can rotate freely around the axis of the chuck body 1; the slider 3 is assembled inside the chuck body 1 and forms a driving connection with the rotating sleeve 2, being driven by the rotating sleeve 2 and able to move axially and radially along the chuck body 1.

[0058] The guide component 4 provides a pre-defined inclined guide path for the slider 3. This path is neither parallel to the axis (axial) of the chuck body 1 nor perpendicular to the axis (radial). When the operator rotates the rotating sleeve 2, the circumferential driving force of the rotating sleeve 2 is transmitted to the slider 3. Under the limiting guidance of the guide component 4, the slider 3 cannot simply move axially or radially, but instead performs a combined axial and radial motion along the inclined guide path.

[0059] When slider 3 is in the first position (e.g.) Figure 2 As shown), at this time, the slider 3 moves along the inclined path to a position that is radially close to the saw blade 9 and axially fitted and positioned, pressing against the saw blade 9 radially and simultaneously locking it axially, thus firmly confining the saw blade 9 within the saw blade mounting position 11; rotating the rotating sleeve 2, the slider 3, guided by the guide component 4, moves from the first position along the inclined composite direction to the second position (as shown). Figure 3 As shown in the figure, during this process, the slider 3 simultaneously moves radially away from the saw blade 9 and axially retracts, thus completely releasing the saw blade 9.

[0060] In this embodiment, the rotating sleeve 2 drives the slider 3 to perform a tilting composite motion, resulting in smoother motion transitions. Clamping and releasing can be completed without significant operational force, greatly reducing the operator's workload. When the slider 3 releases, it simultaneously performs radial and axial retraction. The slider 3 has a larger retraction space and a more reasonable retraction path, effectively preventing interference and scratching between the saw blade 9 and the slider 3 during assembly and disassembly, making assembly and disassembly smoother and faster. Furthermore, the tilting guide path can precisely control the axial and radial displacement of the slider 3, ensuring both the clamping force and limiting effect of the slider 3 on the saw blade 9 during clamping, preventing axial movement and loosening of the saw blade 9 during operation, and avoiding clamping failure due to excessive pursuit of clamping speed, thus balancing reliability and the need for rapid clamping.

[0061] By introducing an inclined guide path, the slider 3 performs a composite axial and radial motion under the drive of the rotating sleeve 2. The design freedom of the spatial motion path replaces the rigid constraint of single-direction motion, thereby greatly improving the ease of operation and the smoothness of saw blade 9 replacement while maintaining clamping reliability.

[0062] Optionally, such as Figure 2 , Figure 3 As shown, it also includes a first elastic element 5, which is disposed between the chuck body 1 and the rotating sleeve 2, and / or, the first elastic element 5 is disposed between the chuck body 1 and the slider 3.

[0063] The first elastic element 5 has a preload force, which is configured such that when the rotating sleeve 2 is released, the drive slider 3 is reset from the second position to the first position.

[0064] Specifically, in this embodiment, the first elastic element 5 can be any one of a torsion spring, a compression spring, or a tension spring.

[0065] The first elastic element 5 is given a preset preload during assembly. The direction of this preload is set to always drive the slider 3 toward pressing the saw blade 9. Therefore, regardless of whether the saw blade 9 is inserted into the saw blade mounting position 11, the preload of the first elastic element 5 can stably hold the slider 3 in the first position. Based on this configuration, the slider 3 will not be in a free-swinging state in the axial and radial directions, thus effectively avoiding high-frequency knocking noises during use due to transmission backlash. At the same time, when the saw blade 9 is not inserted, the slider 3 will not slip off due to gravity or machine tilt, preventing partial obstruction of the saw blade mounting position 11 and ensuring smooth insertion of the saw blade 9 without the need for manual pre-positioning of the slider 3.

[0066] When the preload of the first elastic element 5 is overcome and the rotating sleeve 2 is actively rotated, causing the slider 3 to move from the first position to the second position (releasing the saw blade 9), the first elastic element 5 is further compressed, stretched, or twisted, thereby storing elastic potential energy.

[0067] When the operator completes the replacement of the saw blade 9 and releases the rotating sleeve 2 (i.e., no longer applies external force), the elastic potential energy stored in the first elastic element 5 is released. This preload becomes the sole driving source, pushing the rotating sleeve 2 to rotate in the opposite direction relative to the chuck body 1, or directly pushing the slider 3, thereby driving the slider 3 to automatically return from the second position to the first position, and re-pressing the saw blade 9.

[0068] In this embodiment, the first elastic element 5 can be disposed between the chuck body 1 and the rotating sleeve 2 (e.g., a torsion spring, one end of which is clamped on the chuck body 1 and the other end of which is clamped on the rotating sleeve 2); it can also be disposed between the chuck body 1 and the slider 3 (e.g., a compression spring or a tension spring, which acts directly on the slider 3); or one end of the first elastic element 5 can be disposed on the chuck body 1 and the other end can be disposed on both the rotating sleeve 2 and the slider 3 (forming redundancy or cooperative reset).

[0069] When the operator completes the disassembly and assembly of the saw blade 9 and releases the external force on the rotating sleeve 2, the preload stored in the first elastic element 5 begins to release. Through its own elastic reset movement, the force is transmitted to the rotating sleeve 2 or the slider 3. If the first elastic element 5 is located between the chuck body 1 and the rotating sleeve 2, the preload drives the rotating sleeve 2 to rotate in the opposite direction. Then, through the drive connection between the rotating sleeve 2 and the slider 3, the slider 3 is driven to move in the opposite direction along the inclined path of the guide assembly 4. If the first elastic element 5 is located between the chuck body 1 and the slider 3, the preload acts directly on the slider 3, pushing the slider 3 to move in the opposite direction along the guide path. If both installation methods are used simultaneously, the two forces work together to drive the slider 3. Finally, driven by the preload, the slider 3 automatically resets from the second position (released state) to the first position (pressed state), completing the automatic clamping of the saw blade 9.

[0070] In this optional embodiment, by setting the first elastic element 5, after the rotating sleeve 2 is released, the slider 3 can automatically reset from the second position of releasing the saw blade 9 to the first position of pressing the saw blade 9 under the action of the pre-tightening force of the first elastic element 5, without the operator having to perform an additional reset operation, which greatly improves the convenience and efficiency of operation.

[0071] Optionally, such as Figure 2 , Figure 3 , Figure 4 As shown, the upper end of the chuck body 1 is provided with a first limiting block 12 that protrudes circumferentially, and the upper end of the rotating sleeve 2 abuts against the lower end of the first limiting block 12.

[0072] The lower outer periphery of the chuck body 1 is provided with a circumferentially extending slot 13, and a retaining ring 6 is engaged in the slot 13.

[0073] The guide assembly 4 is axially positioned between the retaining ring 6 and the rotating sleeve 2.

[0074] Specifically, the first limiting block 12 provided at the upper end of the chuck body 1 serves to limit the axial upward movement of the rotating sleeve 2. When the saw blade clamping device is working normally, the rotating sleeve 2 rotates under the operator's control. Since the upper end of the rotating sleeve 2 abuts against the lower end of the first limiting block 12, when the rotating sleeve 2 tends to move upward, the first limiting block 12 will prevent it from continuing to move upward, thereby ensuring that the rotating sleeve 2 can only rotate within the predetermined axial position range and will not detach from the upper end of the chuck body 1, thus affecting the normal operation of the entire device.

[0075] A retaining ring 6 is engaged in a groove 13 on the lower outer periphery of the chuck body 1. A guide assembly 4 is axially positioned between the retaining ring 6 and the rotating sleeve 2. The retaining ring 6 restricts the downward axial movement of the rotating sleeve 2. When the rotating sleeve 2 tends to move downwards, the retaining ring 6 prevents it from continuing downwards, working in conjunction with the first limiting block 12 to stably constrain the rotating sleeve 2 to its axial position on the chuck body 1. On the other hand, the retaining ring 6 provides a lower positioning reference for the guide assembly 4, allowing the guide assembly 4 to be accurately installed between the retaining ring 6 and the rotating sleeve 2. This ensures that the guide assembly 4 can guide the movement of the slider 3 in the predetermined axial and radial directions, ensuring that the slider 3 can accurately move between the first position (the position where the saw blade 9 is pressed) and the second position (the position where the saw blade 9 is released) under the drive of the rotating sleeve 2.

[0076] During assembly, first, the rotating sleeve 2 is inserted from the lower end of the chuck body 1 upwards until its upper end abuts against the first limiting block 12; then, the guide assembly 4 is installed in place; finally, the retaining ring 6 is inserted into the retaining groove 13 at the lower end of the chuck body 1. The retaining ring 6 blocks the guide assembly 4 and / or the rotating sleeve 2 from below, thus completing the overall axial locking.

[0077] In this optional embodiment, the first limiting block 12 and the retaining ring 6 provide double axial limiting for the rotating sleeve 2, effectively preventing axial movement of the rotating sleeve 2 during operation, so that the rotating sleeve 2 can rotate stably on the chuck body 1, thereby improving the structural stability of the entire jigsaw blade clamping device.

[0078] The retaining ring 6 provides a clear lower end positioning for the guide assembly 4, making the installation position of the guide assembly 4 more precise. This helps ensure the accuracy of the guide assembly 4 in guiding the slider 3, enabling the slider 3 to move strictly in the axial and radial directions according to the design requirements. This, in turn, ensures that the saw blade 9 can be accurately clamped and released, improving the working accuracy of the saw blade clamping device.

[0079] Optionally, such as Figure 2 , Figure 3 , Figure 5 As shown, the guide assembly 4 includes a mounting ring 41 and a guide member 42;

[0080] The mounting ring 41 is sleeved on the outer periphery of the chuck body 1 and is located axially between the retaining ring 6 and the rotating sleeve 2;

[0081] The guide member 42 is connected to the inner circumference of the mounting ring 41 and extends along the axial direction of the chuck body 1;

[0082] The slider 3 is provided with a guide hole 31 that slides with the guide member 42 to guide the slider 3 to move along the guide path.

[0083] Specifically, the mounting ring 41 is sleeved on the outer periphery of the chuck body 1. In this embodiment, the mounting ring 41 is interference-fitted with the chuck body 1, and the lower end of the mounting ring 41 abuts against the upper end face of the retaining ring 6. The retaining ring 6 is fixed in the retaining groove 13 on the lower outer periphery of the chuck body 1, providing support and positioning reference for the lower end of the mounting ring 41. The upper end of the rotating sleeve 2 abuts against the first limiting block 12, and its lower end is adjacent to the upper end of the mounting ring 41, thereby restricting the axial movement of the rotating sleeve 2.

[0084] The guide member 42 is connected to the inner circumferential surface of the mounting ring 41 and extends axially along the chuck body 1. Its extension direction forms a preset inclination angle with the axis of the chuck body 1, which matches the required axial and radial combined motion trajectory of the slider 3. The slider 3 has a guide hole 31 that matches the shape and size of the guide member 42. The guide member 42 is inserted into the guide hole 31, forming a sliding fit. The guide member 42 provides guiding constraints for the movement of the slider 3. The slider 3 can slide freely along the extension direction of the guide member 42 but cannot deviate from this path to make offset movements in other directions.

[0085] When the rotating sleeve 2 rotates, it drives the slider 3 to move via a drive connection. Because the guide hole 31 on the slider 3 is fitted onto the inclined guide 42, the movement of the slider 3 is constrained to slide along the extension direction of the guide 42, preventing the slider 3 from rotating relative to the chuck body 1. The inclination direction of the guide 42 determines the movement trajectory of the slider 3: this trajectory simultaneously has an axial component (along the axis of the chuck body 1) and a radial component (perpendicular to the axis). The slider 3 can only move axially along the guide path determined by the guide 42 under the constraint of the guide 42, thereby achieving accurate movement of the slider 3 between the first position (saw blade clamping position) and the second position (saw blade releasing position).

[0086] In this optional embodiment, the sliding engagement between the guide member 42 and the guide hole 31 on the slider 3 provides precise guidance for the movement of the slider 3, ensuring that the slider 3 moves strictly along the predetermined axial path, reducing the offset and swaying of the slider 3 during the movement, thereby improving the accuracy of the jigsaw blade clamping device in clamping and releasing the saw blade.

[0087] The mounting ring 41 is sleeved on the chuck body 1 and axially positioned by the retaining ring 6. Simultaneously, the guide component 42 is connected to the mounting ring 41, making the entire guide assembly 4 and the chuck body 1 a stable whole. During operation, even under significant vibration and impact, the guide assembly 4 remains relatively stable and will not easily loosen or deform, ensuring the stability and reliability of the slider 3's movement.

[0088] Optionally, such as Figure 3 , Figure 4 , Figure 5 As shown, the lower end of the chuck body 1 is provided with an installation gap 14, which is connected to the saw blade mounting position 11. The slider 3 and the guide 42 are both located within the installation gap 14.

[0089] There are two guide members 42, which are arranged opposite each other along the circumference of the mounting ring 41. Each guide member 42 extends axially upward and radially inward from the inner circumference of the mounting ring 41.

[0090] There are two sliders 3, and the two sliders 3 are in one-to-one sliding engagement with the two guides 42;

[0091] When slider 3 is in the first position, the two sliders 3 abut against the two sides of the saw blade 9 in the width direction.

[0092] Specifically, the lower end of the chuck body 1 is provided with an installation gap 14, which communicates with the saw blade mounting position 11. The installation gap 14 provides a accommodating space and working area for the slider 3 and the guide 42, while providing sufficient space for the combined axial and radial movement of the slider 3, avoiding interference between the slider 3 and the chuck body 1 during movement, and enabling the slider 3 to be accurately aligned with the saw blade mounting position 11, ensuring that the slider 3 can stably abut against the saw blade 9, thus providing a structural basis for bidirectional clamping.

[0093] There are two guide members 42, arranged opposite each other circumferentially along the mounting ring 41 (i.e., 180° apart). Each guide member 42 extends axially upward and radially inward from the inner circumference of the mounting ring 41. The inclination directions of the two guide members 42 are symmetrical and converge inward, that is, the distance between the two guide members 42 decreases as they move upward from the mounting ring 41 (towards the upper end of the chuck body 1), forming a figure-eight or inverted V-shaped spatial layout. The angle θ between the guide member 42 and the axis of the chuck body 1 is preferably 5° to 45°. If the angle is too small, the radial travel will be insufficient; if the angle is too large, the axial travel will be too large, resulting in an excessively long chuck body 1.

[0094] Two guide members 42 are provided for the slider 3, and each slider 3 slides in a one-to-one sliding fit with the guide member 42. That is, a guide member 42 is inserted into the guide hole 31 on each slider 3, forming an independent sliding fit relationship. Since the two guide members 42 are arranged opposite each other in the circumferential direction, the two sliders 3 are also synchronously and symmetrically distributed on both sides of the saw blade mounting position 11, precisely corresponding to both sides of the saw blade 9 in the width direction.

[0095] When slider 3 is in the first position, the two sliders 3 abut against both sides of the saw blade 9 in the width direction. During the movement from the second position to the first position, slider 3 moves radially inward along the direction of the inclined extension of guide 42, gradually approaching the saw blade 9, and finally abutting tightly against both sides of the saw blade 9, thereby achieving the pressing and fixing of the saw blade 9.

[0096] When it is necessary to release the saw blade 9, the slider 3 moves from the first position to the second position under the action of the driving component, moves radially outward along the direction of the reverse inclined extension of the guide 42, and gradually moves away from the saw blade 9, releasing the pressure on the saw blade 9, so that the saw blade 9 can be easily removed from the saw blade mounting position 11.

[0097] In this optional embodiment, the two sliders 3 press against each other from both sides of the saw blade 9 in the width direction. Compared with single-sided pressing, this provides a more stable and uniform pressing force, effectively preventing the saw blade 9 from shaking or shifting due to unilateral force during operation, thus improving cutting accuracy and quality. The inclined extension design of the guide 42 allows the sliders 3 to better adapt to the pressing and releasing action requirements during movement, further ensuring the stability and reliability of the pressing.

[0098] The lower end of the chuck body 1 is provided with an installation gap 14. The slider 3 and the guide 42 are both located within the installation gap 14, making full use of the internal space of the chuck body 1, making the structure of the entire clamping device more compact, and not taking up too much external space. This is conducive to the miniaturization and lightweight design of the jigsaw as a whole.

[0099] Optionally, such as Figure 2 , Figure 3 , Figure 5 As shown, the lower inner circumferential wall of the rotating sleeve 2 is provided with a plurality of first oblique teeth 21 distributed in the circumferential direction, and the slider 3 is provided with second oblique teeth 32 that match the first oblique teeth 21.

[0100] The first oblique tooth 21 and the second oblique tooth 32 both extend obliquely relative to the axis of the chuck body 1;

[0101] The rotating sleeve 2 drives the slider 3 to move through the meshing of the first helical tooth 21 and the second helical tooth 32.

[0102] Specifically, when the user rotates the rotating sleeve 2, since the rotating sleeve 2 is fitted on the chuck body 1 and can rotate relative to it, the rotating sleeve 2 begins to make a circular motion around the axis of the chuck body 1.

[0103] The first oblique tooth 21 on the inner circumferential wall of the lower end of the rotating sleeve 2 meshes with the second oblique tooth 32 on the slider 3. Because both the first oblique tooth 21 and the second oblique tooth 32 extend obliquely relative to the axis of the chuck body 1, during the rotation of the rotating sleeve 2, the first oblique tooth 21 generates a component force along the oblique direction on the second oblique tooth 32. This component force can be decomposed into a component force along the axial direction of the chuck body 1 and a component force along the radial direction.

[0104] Under the action of the aforementioned forces, the slider 3 will move along the inclined direction of the guide 42 within the installation gap 14. When the rotating sleeve 2 rotates in one direction, the first oblique tooth 21 pushes the second oblique tooth 32, causing the slider 3 to move towards the saw blade 9 (i.e., the first position direction), thereby achieving the clamping of the saw blade 9; when the rotating sleeve 2 rotates in the opposite direction, the first oblique tooth 21 drives the second oblique tooth 32, causing the slider 3 to move away from the saw blade 9, releasing the clamping of the saw blade 9.

[0105] In this optional embodiment, a slanted tooth meshing method is used for transmission, which can provide a more precise transmission effect. As long as the rotating sleeve 2 rotates at a certain angle, the slider 3 will move according to the predetermined trajectory and distance, ensuring that each operation of clamping and releasing the saw blade 9 is accurate and in place, thus improving the working stability and reliability of the clamping device.

[0106] Furthermore, the helical teeth enable the rotating sleeve 2 to effectively convert rotational force into linear motion force of the slider 3 during rotation. Users only need to apply a small rotational force to make the slider 3 generate sufficient stroke and clamping force, making operation more labor-saving, especially suitable for long-term use or frequent operation.

[0107] Optionally, such as Figure 6 , Figure 7 , Figure 8 As shown, the outer periphery of the chuck body 1 is provided with mounting grooves 15 on opposite sides that communicate with the saw blade mounting position 11, and each mounting groove 15 is provided with a radial clamping member 7.

[0108] The inner circumferential wall of the rotating sleeve 2 is provided with an eccentric groove 22 corresponding to the radial clamping member 7;

[0109] When the rotating sleeve 2 rotates, it drives the radial clamping member 7 to move radially within the eccentric groove 22, so that the two radial clamping members 7 abut against the two sides of the saw blade 9 in the thickness direction.

[0110] Specifically, the outer periphery of the chuck body 1 has mounting grooves 15 on opposite sides, each mounting groove 15 communicating with the saw blade mounting position 11. The mounting gap 14 and the slider 3 correspond to the width direction of the saw blade 9 (the normal direction of the flat surface of the saw blade). The mounting groove 15 corresponds to the thickness direction of the saw blade 9 (the normal direction of the narrow surface of the saw blade). The two mounting grooves 15 are spatially opposite each other, and their axial directions are perpendicular to the movement directions of the two sliders 3 (usually forming a 90° angle).

[0111] Each mounting groove 15 is provided with a radial clamping element 7 (such as a steel ball, top pin, roller, etc.). The radial clamping element 7 can move radially within the mounting groove 15, and one end can extend out of the mounting groove 15 and enter the saw blade mounting position 11 to contact the two sides of the saw blade 9 in the thickness direction.

[0112] The inner circumferential wall of the rotating sleeve 2 is provided with an eccentric groove 22 corresponding to the radial clamping member 7. The eccentric groove 22 is a variable diameter groove, and the distance from the bottom of the groove to the center of the rotating sleeve 2 gradually changes along the circumference (i.e., the eccentricity gradually changes). The outer end of the radial clamping member 7 (the end away from the saw blade) extends into the eccentric groove 22 and contacts the bottom or wall of the groove.

[0113] When the rotating sleeve 2 rotates, the eccentric groove 22 rotates accordingly. Because the radius of the eccentric groove 22 varies circumferentially, the radial clamping member 7 is forced to move radially inward or outward: when the rotating sleeve 2 rotates to align the deeper section (larger radius section) of the eccentric groove 22 with the radial clamping member 7, the clamping member can retract outward (radially outward), releasing the saw blade 9. When the rotating sleeve 2 rotates to align the shallower section (smaller radius section) of the eccentric groove 22 with the radial clamping member 7, the clamping member is pushed inward (radially inward), clamping the saw blade 9. The two radial clamping members 7 are located on opposite sides of the saw blade 9's thickness direction. When the rotating sleeve 2 rotates, they move synchronously but in opposite directions (simultaneously inward or simultaneously outward), achieving double-sided centering clamping or loosening.

[0114] In this embodiment, the clamping of the slider 3 in the width direction of the saw blade 9 and the clamping of the radial clamping member 7 in the thickness direction of the saw blade 9 are simultaneously driven by the rotation of the same rotating sleeve 2. That is, a single rotation of the rotating sleeve 2 can simultaneously control the synchronous movement of two dimensions and four clamping elements (two width sliders 3 and two thickness clamping members). The two cooperate with each other to form an all-round clamping constraint, ensuring that the saw blade 9 is firmly fixed in the saw blade mounting position 11.

[0115] In this optional embodiment, the cooperation between the eccentric groove 22 and the radial clamping member 7 provides a stable and large clamping force. The design of the eccentric groove 22 allows the radial clamping member 7 to continuously and evenly apply pressure to the saw blade 9 during the rotation of the rotating sleeve 2, ensuring that the saw blade 9 will not loosen during the cutting process, thus improving the cutting accuracy and safety.

[0116] Furthermore, the two sliders 3 clamp the flat surface of the saw blade 9 from both sides, and the two radial clamping elements 7 clamp the narrow surface of the saw blade 9 from both sides. The four clamping elements apply clamping force to the saw blade 9 from two mutually perpendicular directions simultaneously, achieving four-way centered clamping, and the position of the saw blade 9 in space is completely locked. Moreover, only one action of rotating the rotating sleeve 2 is needed to drive all four clamping elements simultaneously, realizing one-button all-around clamping, making the operation extremely simple.

[0117] Optionally, such as Figure 1 , Figure 2 , Figure 3 The upper end of the chuck body 1 is connected to a reciprocating rod 8, and a bushing 81 is provided inside the reciprocating rod 8;

[0118] The lower end of the bushing 81 is provided with an abutment groove 811 that communicates with the saw blade mounting position 11, and the abutment groove 811 extends axially.

[0119] When the saw blade 9 is installed in the saw blade mounting position 11, one axial end of the saw blade 9 abuts against the bottom of the abutment groove 811 to limit the axial displacement of the saw blade 9.

[0120] Specifically, the chuck body 1 is connected to the reciprocating rod 8 to form an integral structure. The reciprocating rod 8 performs reciprocating linear motion when the jigsaw is working. The bushing 81 is installed inside the reciprocating rod 8 and provides a key component for the axial positioning of the saw blade 9. The abutment groove 811 is located at the lower end of the bushing 81 and extends axially, corresponding to the saw blade mounting position 11, and is used to accommodate one axial end of the saw blade 9.

[0121] When the saw blade 9 is installed in the saw blade mounting position 11, the operator inserts one axial end of the saw blade 9 into the abutment groove 811 and pushes the saw blade 9 so that one axial end gradually approaches the bottom of the abutment groove 811.

[0122] As the saw blade 9 continues to advance, one axial end of the saw blade 9 eventually abuts against the bottom of the abutment groove 811. At this point, due to the blocking effect of the abutment groove 811, the saw blade 9 cannot continue to move in the axial direction, thereby limiting the axial displacement of the saw blade 9 and ensuring that the saw blade 9 will not move in the axial direction during operation.

[0123] In this optional embodiment, the engagement between the lower end of the bushing 81 and the axial end of the saw blade 9 through the lower end abutment groove 811 can precisely limit the position of the saw blade 9 in the axial direction, ensuring that the saw blade 9 is always in the correct axial position during the cutting process, improving the cutting accuracy and stability, and reducing cutting errors and damage to the saw blade 9 caused by axial movement of the saw blade 9.

[0124] Optionally, such as Figure 2 , Figure 3 As shown, a second elastic element 82 is provided inside the reciprocating rod 8. The second elastic element 82 is located at the upper end of the bushing 81 and abuts against the bushing 81.

[0125] The upper end of the bushing 81 is provided with an axially extending waist-shaped hole 812, and the reciprocating rod 8 is provided with a positioning pin 83. The positioning pin 83 passes through the waist-shaped hole 812, and the two ends of the positioning pin 83 are fixedly connected to the reciprocating rod 8.

[0126] The second elastic element 82 is configured to drive the bushing 81 to move toward the opening of the abutment groove 811 so as to eject the saw blade 9 from the saw blade mounting position 11 when the slider 3 moves to the second position.

[0127] Specifically, the reciprocating rod 8 is provided with a second elastic element 82 (e.g., a compression spring, a disc spring, or elastic rubber). The second elastic element 82 is located at the upper end of the bushing 81, that is, between the upper end face of the bushing 81 and the inner wall (or closed end) of the reciprocating rod 8. The second elastic element 82 abuts against the bushing 81, applying a downward thrust to the bushing 81 (towards the opening of the abutment groove 811, that is, towards the saw blade insertion port).

[0128] The upper end of the bushing 81 is provided with an axially extending oblong hole 812 (elongated hole), the length direction of which is parallel to the axis of the reciprocating rod 8. A locating pin 83 is provided on the reciprocating rod 8, passing through the oblong hole 812, and both ends of the locating pin 83 are fixedly connected to the reciprocating rod 8 (e.g., pressed into pin holes on the side wall of the reciprocating rod 8). The locating pin 83 and the oblong hole 812 form a sliding guide pair: the bushing 81 can slide axially relative to the locating pin 83 within the length range of the oblong hole 812. When the bushing 81 slides to the upper (or lower) end of the oblong hole 812 and contacts the locating pin 83, further movement of the bushing 81 is restricted, thus determining the extreme position of the bushing 81.

[0129] The slider 3 is in the first position, clamping the saw blade 9 in the width direction. The end face of the saw blade 9 abuts against the bottom of the abutment groove 811. The saw blade 9 exerts an upward reaction force on the bushing 81 (because the saw blade is clamped and fixed, while the second elastic element 82 pushes the bushing 81 downward, the two are in balance). The second elastic element 82 is compressed, storing elastic potential energy. The bushing 81 is in the upper position of the stroke of the oblong hole 812.

[0130] Rotate the rotating sleeve 2 to move the slider 3 to the second position (releasing the saw blade), and the saw blade 9 is no longer subject to clamping force in the radial direction. The elastic potential energy stored in the second elastic element 82 is released, pushing the bushing 81 downward (towards the opening of the abutment groove 811). When the bushing 81 moves downward, the bottom of the abutment groove 811 pushes the end face of the saw blade 9, pushing the saw blade 9 downward out of the saw blade mounting position 11.

[0131] When the lower end of the oblong hole 812 contacts the locating pin 83, the bushing 81 stops moving, and the saw blade 9 is ejected to a position that is easy to remove.

[0132] In this optional embodiment, the bushing 81 is moved by the second elastic element 82, and the saw blade 9 is automatically ejected from the saw blade mounting position 11. The operator can remove the saw blade 9 without manually touching it, which greatly simplifies the saw blade 9 replacement process. It is especially suitable for high-frequency saw blade 9 replacement scenarios, improves operating efficiency, and lowers the operating threshold.

[0133] Optionally, such as Figure 2 , Figure 3 , Figure 6 As shown, the upper inner circumferential wall of the rotating sleeve 2 is provided with a relief groove 23, and at least a portion of the first elastic member 5 is accommodated in the relief groove 23.

[0134] Specifically, the upper inner circumferential wall of the rotating sleeve 2 is provided with a clearance groove 23. The clearance groove 23 can be a complete annular groove or multiple intermittent grooves distributed circumferentially. The opening position of the clearance groove 23 corresponds to the installation position of the first elastic member 5.

[0135] The core function of the clearance groove 23 is to provide a dedicated space for the first elastic element 5, so as to avoid interference with components such as the rotating sleeve 2 and the chuck body 1. When the first elastic element 5 is in the initial state of pre-compression / pre-tension, at least a part of it is accommodated in the clearance groove 23, so as to prevent the first elastic element 5 from protruding from the inner peripheral wall of the rotating sleeve 2, and to prevent the first elastic element 5 from rubbing and colliding with the outer peripheral surface of the chuck body 1 and the end of the slider 3 when the rotating sleeve 2 rotates, thus ensuring that the rotating sleeve 2 rotates smoothly.

[0136] When the operator rotates the rotating sleeve 2 and drives the slider 3 to move from the first position to the second position, the first elastic element 5 is further compressed or stretched, and its volume changes. At this time, the clearance groove 23 can accommodate the excess part of the first elastic element 5 after deformation, avoiding interference between the first elastic element 5 and surrounding components due to deformation, and ensuring that the first elastic element 5 can smoothly accumulate elastic potential energy. When the rotating sleeve 2 is released, the first elastic element 5 releases the preload and drives the rotating sleeve 2 to rotate in the opposite direction. The clearance groove 23 also provides space for the reset deformation of the first elastic element 5, ensuring that the elastic driving force can be stably transmitted to the rotating sleeve 2 or the slider 3 without jamming, ensuring that the slider 3 can smoothly reset to the first position, and realizing the automatic clamping of the saw blade 9.

[0137] In this optional embodiment, by providing a clearance groove 23 on the inner peripheral wall of the upper end of the rotating sleeve 2 to accommodate at least a portion of the first elastic member 5, the internal space of the rotating sleeve 2 is effectively utilized, avoiding the need to add an extra complex structure or occupy too much external space for installing the first elastic member 5, making the structure of the entire device more compact, which is beneficial to reducing the size and weight of the device and making it easy to carry and operate.

[0138] Furthermore, the clearance groove 23 provides a relatively independent and protected space for the first elastic element 5, isolating the first elastic element 5 from other components that may cause damage to it, reducing accidental damage to the first elastic element 5, and ensuring that the first elastic element 5 can accurately generate the corresponding elastic force in both the deformation stage and the recovery stage, thus ensuring the accuracy and stability of the movement of the rotating sleeve 2 and other related components, thereby improving the working performance and reliability of the entire device.

[0139] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A saw blade clamping device, characterized in that include: The chuck body (1) is provided with a saw blade mounting position (11) for accommodating the saw blade; A rotating sleeve (2) is fitted around the outer periphery of the chuck body (1) in a manner that allows it to rotate about the axis of the chuck body (1); The slider (3) is movably disposed within the chuck body (1) along the axial and radial directions, and the slider (3) is driven to be connected to the rotating sleeve (2). The guide assembly (4) is configured to guide the slider (3) to move along a guide path that extends obliquely relative to the axis of the chuck body (1) when the rotating sleeve (2) rotates; The slider (3) is configured to move from a first position pressing the saw blade to a second position releasing the saw blade in response to the rotation of the rotating sleeve (2) and guided by the guide assembly (4). The upper end of the chuck body (1) is provided with a first limiting block (12) that protrudes circumferentially, and the upper end of the rotating sleeve (2) abuts against the lower end of the first limiting block (12). The lower outer periphery of the chuck body (1) is provided with a circumferentially extending slot (13), and a retaining ring (6) is engaged in the slot (13); The guide component (4) is axially disposed between the retaining ring (6) and the rotating sleeve (2); The guide assembly (4) includes a mounting ring (41) and a guide member (42); The mounting ring (41) is sleeved on the outer periphery of the chuck body (1) and is located axially between the retaining ring (6) and the rotating sleeve (2); The guide (42) is connected to the inner circumference of the mounting ring (41) and extends along the axial direction of the chuck body (1); The slider (3) is provided with a guide hole (31) that slides with the guide member (42) to guide the slider (3) to move along the guide path.

2. The saw blade clamping device according to claim 1, characterized in that It also includes a first elastic element (5), which is disposed between the chuck body (1) and the rotating sleeve (2), and / or, the first elastic element (5) is disposed between the chuck body (1) and the slider (3); The first elastic element (5) has a preload force configured to drive the slider (3) to reset from the second position to the first position when the rotating sleeve (2) is released.

3. The saw blade clamping device according to claim 1, characterized in that The lower end of the chuck body (1) is provided with an installation gap (14), which is connected to the saw blade mounting position (11). The slider (3) and the guide (42) are both located within the installation gap (14). There are two guide members (42), which are arranged opposite each other along the circumference of the mounting ring (41). Each guide member (42) extends axially upward and radially inward from the inner circumference of the mounting ring (41). There are two sliders (3), and the two sliders (3) are in one-to-one sliding engagement with the two guides (42); When the slider (3) is in the first position, the two sliders (3) abut against the two sides of the saw blade width direction respectively.

4. The saw blade clamping device according to claim 3, characterized in that The lower inner circumferential wall of the rotating sleeve (2) is provided with a plurality of first oblique teeth (21) distributed along the circumferential direction, and the slider (3) is provided with second oblique teeth (32) that match the first oblique teeth (21); The first oblique tooth (21) and the second oblique tooth (32) both extend obliquely relative to the axis of the chuck body (1); The rotating sleeve (2) drives the slider (3) to move through the meshing of the first helical tooth (21) and the second helical tooth (32).

5. The saw blade clamping device according to claim 3, characterized in that, The outer periphery of the chuck body (1) is provided with mounting grooves (15) on opposite sides that communicate with the saw blade mounting position (11), and each mounting groove (15) is provided with a radial clamping member (7); The inner circumferential wall of the rotating sleeve (2) is provided with an eccentric groove (22) corresponding to the radial clamping member (7); When the rotating sleeve (2) rotates, it drives the radial clamping member (7) to move radially within the eccentric groove (22), so that the two radial clamping members (7) abut against the two sides of the saw blade thickness direction respectively.

6. The saw blade clamping device according to claim 3, characterized in that The upper end of the chuck body (1) is connected to a reciprocating rod (8), and a bushing (81) is provided inside the reciprocating rod (8); The lower end of the bushing (81) is provided with an abutment groove (811) that communicates with the saw blade mounting position (11), and the abutment groove (811) extends axially. When the saw blade is installed in the saw blade mounting position (11), one axial end of the saw blade abuts against the bottom of the abutment groove (811) to limit the axial displacement of the saw blade.

7. A saw blade clamping device according to claim 6, characterized in that The reciprocating rod (8) is provided with a second elastic element (82), which is located at the upper end of the bushing (81) and abuts against the bushing (81); The upper end of the bushing (81) is provided with an axially extending waist-shaped hole (812), and the reciprocating rod (8) is provided with a positioning pin (83). The positioning pin (83) passes through the waist-shaped hole (812), and the two ends of the positioning pin (83) are fixedly connected to the reciprocating rod (8). The second elastic element (82) is configured to drive the bushing (81) to move toward the opening of the abutment groove (811) so as to eject the saw blade from the saw blade mounting position (11) when the slider (3) moves to the second position.

8. The saw blade clamping device according to claim 2, characterized in that The upper inner circumferential wall of the rotating sleeve (2) is provided with a relief groove (23), and at least a portion of the first elastic member (5) is accommodated in the relief groove (23).

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