Fastener driver

Abstract

The application provides a fastener driver, which comprises an energy storage unit, an impact unit and a driving unit, the energy storage unit has an energy storage state and a release state; the impact unit is used for driving the energy storage unit to store energy and can bear the impact energy released by the energy storage unit to drive the fastener into a workpiece along a first direction, the impact unit comprises a first matching structure and a second matching structure; the driving unit can be matched with the impact unit, the driving unit comprises a first engagement structure and a second engagement structure; wherein the energy storage process of the energy storage unit comprises a first stage and a second stage, in the first stage, the first engagement structure is matched with the first matching structure, so that the impact unit drives the energy storage unit to store energy, in the second stage, the first engagement structure is separated from the first matching structure, the second engagement structure is matched with the second matching structure, so that the impact unit drives the energy storage unit to store energy.

Description

[0001] This invention is a divisional application of Patent Application No. 202311663560.0, filed on December 6, 2023, entitled "Fastener Insertion Machine". Technical Field

[0002] This application relates to the field of power tools, and more particularly to a fastener driving machine. Background Technology

[0003] Generally, fastener driving machines include an energy storage unit, which contains a spring. The machine stores energy by compressing the spring and then quickly releases it to perform work, driving the fastener into the workpiece. Specifically, existing fastener driving machines store energy by compressing the spring in a first direction and then quickly releasing it in a second direction (opposite to the first). Fastener driving machines that use springs to store or release energy typically suffer from significant rebound; the rebound momentum acting on the machine body, especially the handle, is large, resulting in a significant rebound force felt by the user.

[0004] Therefore, it is necessary to provide a new fastener driving machine. Summary of the Invention

[0005] This application provides a fastener insertion machine that operates stably and smoothly.

[0006] Specifically, this application provides a fastener driving machine, comprising:

[0007] An energy storage unit has an energy storage state and an energy release state;

[0008] An impact unit is used to drive the energy storage unit to store energy and withstand the impact energy released by the energy storage unit to drive the fastener into the workpiece along a first direction. The impact unit includes a second engagement mechanism, which includes a first engagement structure and a second engagement structure. In the extension direction of the impact unit, the first engagement structure and the second engagement structure are disposed at different positions.

[0009] A drive unit, which can cooperate with the impact unit, includes a first engagement mechanism, which comprises a first engagement structure and a second engagement structure; wherein...

[0010] The energy storage process of the energy storage unit includes a first stage and a second stage. In the first stage, the first meshing structure cooperates with the first mating structure, causing the impact unit to drive the energy storage unit to store energy. In the second stage, the first meshing structure disengages from the first mating structure, and the second meshing structure cooperates with the second mating structure, causing the impact unit to drive the energy storage unit to store energy.

[0011] Furthermore, the first engagement mechanism also includes an output shaft, and both the first engagement structure and the second engagement structure are mounted on the output shaft and rotate with the output shaft.

[0012] Furthermore, the first meshing structure and the second meshing structure are offset along the axial direction of the output shaft.

[0013] Furthermore, the first meshing structure periodically engages or disengages from the first mating structure during the rotation of the output shaft, and the second meshing structure periodically engages or disengages from the second mating structure during the rotation of the output shaft.

[0014] Furthermore, the first meshing structure engages with the first mating structure to cause the drive unit to drive the impact unit to move along the second direction, and the second meshing structure engages with the second mating structure to cause the drive unit to drive the impact unit to move along the second direction; during one rotation cycle of the output shaft, the rotation angle of the first meshing structure while maintaining engagement with the first mating structure is less than 180°, and the rotation angle of the second meshing structure while maintaining engagement with the second mating structure is less than 180°.

[0015] Furthermore, the first engagement structure is a first cam, and the second engagement structure is a second cam.

[0016] Furthermore, the second engagement mechanism also includes a base, and the impact unit also includes a striker connected to the base. The striker is used to drive the fastener into the workpiece along the first direction, and the first mating structure and the second mating structure are disposed on the base.

[0017] Furthermore, the first mating structure is a first retaining shaft, and the second mating structure is a second retaining shaft.

[0018] Furthermore, the first mating structure is mounted on the base.

[0019] Furthermore, the first engagement mechanism also includes an output shaft that passes through at least a portion of the first engagement structure and at least a portion of the second engagement structure.

[0020] In this application, the fastener driving machine includes an energy storage unit, an impact unit, and a drive unit. The drive unit includes a first engagement mechanism, which includes a first engagement structure and a second engagement structure. The impact unit includes a second engagement mechanism, which includes a first mating structure and a second mating structure. The first engagement structure can only engage with the first mating structure, and the second engagement structure can only engage with the second mating structure. They are independent of each other and do not interfere with each other, so there will be no misalignment or jamming. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the fastener driving machine of this application.

[0022] Figure 2 yes Figure 1 The diagram shows the structure of the drive unit.

[0023] Figure 3 yes Figure 2 The shown is a cross-sectional view of the drive unit along CC.

[0024] Figure 4 yes Figure 1 The diagram shows the structure of the first meshing mechanism and the second meshing mechanism.

[0025] Figure 5 yes Figure 1 The diagram shows a partial structure of the fastener driving machine.

[0026] Figure 6 yes Figure 5 The shown section is a cross-sectional view along the CC direction.

[0027] Figure 7 yes Figure 6 The diagram shows a cross-sectional view of the partial structure along DD.

[0028] Figure 8 This is a schematic diagram of the fastener driving machine of this application in various states during its working cycle. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0030] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates two or more. Unless otherwise stated, terms such as "front," "rear," "lower," and / or "upper" are for ease of description only and are not limited to a location or spatial orientation. Terms such as "comprising" or "including" mean that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0031] Please combine Figures 1 to 8 This application provides a fastener driving machine 100, which includes a housing 101 and an energy storage unit 10, an impact unit 20, a conveying unit 30, and a drive unit 40 installed within the housing 101. The conveying unit 30 connects the energy storage unit 10 and the impact unit 20. The fastener driving machine 100 also includes a fastener guide plate 50 and a fastener storage clamp 60. The fastener storage clamp 60 is connected to the fastener guide plate 50 and contains fasteners (not shown in the figure). The fastener storage clamp 60 can convey fasteners to the fastener guide plate 50, and the fastener guide plate 50 guides the fasteners. The fasteners are used to be driven into the workpiece by the impact unit 20. In this application, the fastener is a nail, the fastener guide plate 50 is a nail guide plate, and the fastener storage clamp 60 is a nail clamp.

[0032] In this application, the impact unit 20 moves along a first direction to drive the fastener into the workpiece. The energy storage unit 10 has an energy storage state and a release state. During the transition from the self-release state to the energy storage state, the drive unit 40 cooperates with the impact unit 20, driving the impact unit 20 to move along a second direction different from the first direction. The impact unit 20 drives the energy storage unit 10 to store energy through the transmission unit 30. Specifically, the impact unit 20 drives the transmission unit 30, which in turn drives the energy storage unit 10 to store energy. During the transition from the self-energy storage state to the release state, the drive unit 40 disengages from the impact unit 20, and the energy storage unit 10 releases energy along the second direction to drive the transmission unit 30. The transmission unit 30 then drives the impact unit 20 to move along the first direction to drive the fastener into the workpiece. In this application, the second direction is opposite to the first direction. The energy storage state is the state where the energy storage unit 10 has finished storing energy, and the release state is the state where the energy storage unit 10 has finished releasing energy. When the energy storage unit 10 is in the energy storage state, the impact unit 20 is at least partially located inside the energy storage unit 10. This design reduces the overall length of the fastener driving machine 100.

[0033] In this application, the energy storage unit 10 releases energy along the second direction, and after being transmitted by the transmission unit 30, the impact unit 20 drives the fastener into the workpiece along the first direction opposite to the second direction. With this design, the energy release direction (i.e., the second direction) is opposite to the fastener driving direction (i.e., the first direction). By utilizing momentum balance, the rebound of the fastener driving machine 100 body, especially the handle, is greatly reduced, thus improving the user experience.

[0034] The energy storage unit 10 is a medium that can store energy through displacement changes, such as an air spring, a mechanical spring, a rubber element, or a vacuum. In this application, the energy storage unit 10 includes a spring 11, a baffle 12, and a tail cover 13. The spring 11 is disposed between the tail cover 13 and the baffle 12, and the baffle 12 is fixedly installed inside the housing 101. When the energy storage unit 10 is in the released state, the baffle 12 is disposed between the spring 11 and the impact unit 20; when the energy storage unit 10 is in the energy storage state, the impact unit 20 is at least partially located inside the spring 11. The spring 11 includes a fixed end 111 and a movable end 112. The movable end 112 is movable relative to the fixed end 111. The fixed end 111 of the spring 11 is fixed to the baffle 12. The movable end 112 of the spring 11 is housed in the receiving space 130 formed by the tail cover 13. Specifically, the tail cover 13 includes a cylindrical portion 131 with the aforementioned receiving space 130. A portion of the movable end 112 of the spring 11 is housed in the aforementioned receiving space 130. The tail cover 13 guides the movement of the movable end 112 of the spring 11, and the tail cover 13 moves together with the movable end 112 of the spring 11. The movable end 112 of spring 11 moves along the second direction to release energy, and the movable end 112 of spring 11 moves along the first direction to store energy. Specifically, during the process of switching from a self-storage state to a release state, the movable end 112 of spring 11 moves along the second direction to release energy, spring 11 drives tail cover 13 to move along the second direction, tail cover 13 drives conveying unit 30, and conveying unit 30 drives impact unit 20 to move along the first direction. During the process of switching from a self-release state to a storage state, drive unit 40 drives impact unit 20 to move along the second direction, impact unit 20 drives conveying unit 30, conveying unit 30 drives tail cover 13 to move along the first direction, and tail cover 13 drives movable end 112 of spring 11 to move along the first direction to store energy. The movable end 112 of spring 11 and impact unit 20 are linked through conveying unit 30, so that the direction of movement of movable end 112 of spring 11 is different from the direction of movement of impact unit 20.

[0035] The drive unit 40 includes a motor 41, a gear transmission mechanism 42, and a first engagement mechanism 43. The gear transmission mechanism 42 is connected between the motor 41 and the first engagement mechanism 43. The first engagement mechanism 43 includes a rotatable output shaft 430, a first engagement structure 431, and a second engagement structure 432. Both the first engagement structure 431 and the second engagement structure 432 are mounted on the output shaft 430 and rotate with it. The first engagement structure 431 and the second engagement structure 432 are offset along the axial direction of the output shaft 430, and the output shaft 430 passes through at least a portion of the first engagement structure 431 and at least a portion of the second engagement structure 432. In this application, the first engagement structure 431 is a first cam, and the second engagement structure 432 is a second cam. The first engagement mechanism 43 also includes a nut 433 and a retaining ring 434. The first cam 431 is limited to the output shaft 430 by the nut 433, and the second cam 432 is limited to the output shaft 430 by the retaining ring 434. The motor 41 provides torque and speed, which are output through a gear transmission mechanism 42. The gear transmission mechanism 42 is used to reduce speed while increasing torque. The gear transmission mechanism 42 includes one or more stages of planetary gear transmission; in this application, the gear transmission mechanism 42 includes a three-stage planetary gear transmission. The torque and speed output by the motor 41 are transmitted to the output shaft 430 of the first meshing mechanism 43 via the gear transmission mechanism 42. The output shaft 430 is supported by a bearing 435 and a bushing 436. The bearing 435, bushing 436, and gear transmission mechanism 42 are all housed within a gearbox. It should be noted that the gear transmission mechanism 42 is not essential; when the torque output by the motor 41 is sufficiently large, the motor shaft can directly serve as the output shaft 430 of the first meshing mechanism 43.

[0036] The impact unit 20 includes a second engagement mechanism 23 and a striker 21 and a drive wheel 22 connected to the second engagement mechanism 23. The second engagement mechanism 23 includes a first mating structure 231 and a second mating structure 232, which are located at different positions along the extension direction of the impact unit 20. Specifically, the second engagement mechanism 23 includes a base 230 and a first mating structure 231 and a second mating structure 232 disposed on the base 230; the first mating structure 231 is a first engagement part, and the second mating structure 232 is a second engagement part. In this application, the first engagement part 231 is a first retaining shaft, and the second engagement part 232 is a second retaining shaft. The first retaining shaft 231 is mounted on the base 230, and the second retaining shaft 232 is mounted on the base 230. A first cam 431 engages with the first retaining shaft 231, and a second cam 432 engages with the second retaining shaft 232. The base 230 and the firing pin 21 are connected by a pin, allowing them to move together. The firing pin 21 is used to drive the fastener into the workpiece. The drive wheel 22 is mounted to the base 230 by a pin and can rotate around the pin. The drive wheel 22 is connected to the conveying unit 30, thereby driving the energy storage unit 10 to store energy. The base 230 can also be designed to be directly connected to the conveying unit 30. Therefore, the drive wheel 22 is not necessary for the overall function of the machine. In this application, the drive wheel 22 is provided to reduce the friction caused by the imbalance of forces.

[0037] Because the first cam 431 and the second cam 432 are offset along the axial direction of the output shaft 430, the first cam 431 can only mesh with the first retaining shaft 231, and the second cam 432 can only mesh with the second retaining shaft 232, and the two do not interfere with each other. A first bushing is installed on the first retaining shaft 231, and a second bushing is installed on the second retaining shaft 232, which can reduce the frictional force during meshing.

[0038] The conveying unit 30 includes a conveyor belt 31 and two fixed pulleys 32. The two fixed pulleys 32 are mounted on the housing 101, and the conveyor belt 31 is mounted on the two fixed pulleys 32. The conveyor belt 31 connects the drive wheel 22 of the impact unit 20 and the tail cover 13 of the energy storage unit 10. In this application, the fixed pulleys 32 are rollers, which can rotate around a roller shaft, and the roller shaft is installed inside the housing 101. Therefore, the rollers 32 function as fixed pulleys. In this application, the conveyor belt 31 is a fiber braided belt; it should be noted that in other embodiments, the conveyor belt 31 can also be a belt, wire rope, or other fiber braided rope. The conveying unit 30 is configured such that the moving direction of the movable end 112 of the spring 11 is opposite to the moving direction of the impact unit 20.

[0039] The connection method between the conveyor belt 31 and the tail cover 13 can have different designs depending on the type of conveyor belt 31 used. The conveyor belt 31 used in this application is an open-type braided belt, which includes a middle section 311 and two end sections 312. The fastener insertion machine 100 also includes a first fixing plate 71, a second fixing plate 72, and a fastener 73. The conveyor belt 31 includes a middle section 311 and two end sections 312 located on both sides of the middle section 311. The middle section 311 includes a main body 313 and two connecting sections 314 located on both sides of the main body 313. The connecting sections 314 connect the main body 313 and the end sections 312. The connecting sections 314 include a first connecting section 315 and a second connecting section 316 arranged adjacent to each other. The first connecting section 315 is clamped between the tail cover 13 and the first fixing plate 71, and the second connecting section 316 is clamped between the first fixing plate 71 and the second fixing plate 72. The end sections 312 are clamped between the main body 313 and the second fixing plate 72. After passing the fixed pulley 32, the main body 313 is connected to the drive wheel 22 of the impact unit 20. The fastener 73 fixes the tail cover 13, the first fixing plate 71 and the second fixing plate 72 together. In this application, the fastener 73 is a screw.

[0040] Specifically, the conveyor belt 31 and the tail cover 13 are fixed in a maze-like manner. That is, the conveyor belt 31 passes through the gap between the first fixing plate 71 and the tail cover 13, then passes through the gap between the second fixing plate 72 and the first fixing plate 71, and then the end 312 of the conveyor belt 31 is placed between the second fixing plate 72 and the body part 313 of the conveyor belt 31. Finally, the first fixing plate 71 and the second fixing plate 72 are fixed to the tail cover 13 by screws 73. The aforementioned labyrinthine fixing method increases the contact area between the conveyor belt 31 and the fixing parts (i.e., the first fixing plate 71 and the second fixing plate 72). Furthermore, the end 312 of the conveyor belt 31 is positioned between the second fixing plate 72 and the body 313 of the conveyor belt 31. When the conveyor belt 31 is released, the end 312 moves in a second direction, while the body 313 moves in a first direction. The direction of movement of the body 313 is opposite to that of the end 312. When the conveyor belt 31 is tensioned, the body 313 and the end 312 can achieve a self-locking effect. Therefore, the aforementioned labyrinthine fixing method significantly increases the force required to release the conveyor belt 31. It should be noted that for an open conveyor belt 31, the end 312 of the conveyor belt 31 can also be connected to the impact unit 20, and the middle portion 311 of the conveyor belt 31 can be connected to the tail cap 13 after passing the fixed pulley 32. In other embodiments, if two open conveyor belts 31 are used, the two ends 312 of the open conveyor belts 31 are respectively connected to the tail cover 13 and the impact unit 20; or, if a non-open loop conveyor belt 31 is used, the loop conveyor belt 31 is simply hung on the tail cover 13 and passed over the fixed pulley 32 to connect with the impact unit 20.

[0041] The impact unit 20 and the spring 11 are arranged along the extension and contraction direction of the spring 11. Two fixed pulleys 32 are arranged on both sides of the spring 11 along a third direction, which is perpendicular to the extension and contraction direction of the spring 11. This design ensures that when the impact unit 20 moves along the second direction, the movable end 112 of the spring 11 of the energy storage unit 10 is compressed along the first direction. A pad 33 is provided on each side of the fixed pulley 32 to restrict the conveyor belt 31 and prevent the conveyor belt 31 from shifting axially along the fixed pulley 32.

[0042] The first engagement mechanism 43 periodically engages or disengages with the second engagement mechanism 23. When the first engagement mechanism 43 engages with the second engagement mechanism 23, the drive unit 40 drives the impact unit 20 to move along the second direction, the impact unit 20 drives the conveying unit 30, the conveying unit 30 drives the tail cover 13 to move along the first direction, and the tail cover 13 drives the movable end 112 of the spring 11 to move along the first direction to store energy. When the first engagement mechanism 43 disengages from the second engagement mechanism 23, the movable end 112 of the spring 11 moves along the second direction, the movable end 112 of the spring 11 drives the tail cover 13 to move along the second direction, the tail cover 13 drives the conveying unit 30, and the conveying unit 30 drives the impact unit 20 to move along the first direction to drive the fastener into the workpiece. Specifically, the first cam 431 periodically engages or disengages with the first retaining shaft 231 during rotation with the output shaft 430, and the second cam 432 periodically engages or disengages with the second retaining shaft 232 during rotation with the output shaft 430. The first cam 431 engages with the first retaining shaft 231 so that the drive unit 40 drives the impact unit 20 to move in the second direction, and the second cam 432 engages with the second retaining shaft 232 so that the drive unit 40 drives the impact unit 20 to move in the second direction.

[0043] The energy storage process of the energy storage unit 10 includes a first stage and a second stage. In the first stage, the first cam 431 engages with the first retaining shaft 231, causing the impact unit 20 to drive the energy storage unit 10 to store energy. In the second stage, the first cam 431 disengages from the first retaining shaft 231, and the second cam 432 engages with the second retaining shaft 232, causing the impact unit 20 to drive the energy storage unit 10 to store energy. Specifically, when the output shaft 430 rotates, the first cam 431 first engages with the first retaining shaft 231. After the drive unit 40 drives the impact unit 20 to move a certain distance, the second cam 432 then engages with the second retaining shaft 232. Immediately afterwards, the first cam 431 disengages from the first retaining shaft 231. Due to the engagement of the second cam 432 with the second retaining shaft 232, the drive unit 40 continues to drive the impact unit 20 to move until the second cam 432 disengages from the second retaining shaft 232. Afterward, the impact unit 20 completes the fastener driving action under the action of the energy released by the energy storage unit 10. Both the first cam 431 and the second cam 432 have specific shapes, allowing their rotational motion to be converted into linear motion of the impact unit 20. During one rotation cycle of the output shaft 430, the rotation angle of the first cam 431 while engaged with the first retaining shaft 231 is less than 180°, and the rotation angle of the second cam 432 while engaged with the second retaining shaft 232 is less than 180°. Therefore, after the second cam 432 disengages from the second retaining shaft 232, and after the impact unit 20 completes the fastener insertion action, the first cam 431 will re-engage with the first retaining shaft 231 after a certain period.

[0044] The fastener driving machine 100 also includes two parallel guide rails 80, which are installed inside the housing 101. The guide rails 80 are elongated, and the impact unit 20 is placed between the two guide rails 80. The impact unit 20 moves along the two guide rails 80, maintaining a linear motion. The two guide rails 80 pass through the energy storage unit 10. Specifically, the two guide rails 80 pass through the tail cover 13, the spring 11, and the baffle 12 along the extension and retraction direction of the spring 11. During the transition from the self-release state to the energy storage state of the energy storage unit 10, the drive unit 40 drives the impact unit 20 to move along the second direction. When the energy storage unit 10 is in the energy storage state, the impact unit 20 is at least partially located inside the spring 11. This design reduces the overall length of the fastener driving machine 100.

[0045] The fastener driving machine 100 also includes a first base 91 connected to one end of two guide rails 80 and a second base 92 connected to the other end of the two guide rails 80. The first base 91 is connected to one end of the two guide rails 80 by screws, and the second base 92 is connected to the other end of the two guide rails 80 by screws. Both the first base 91 and the second base 92 are installed inside the housing 101. The fastener driving machine 100 also includes a first buffer 93 installed inside the first base 91 and a second buffer 94 installed inside the second base 92. The fastener guide plate 50 is connected to the first base 91. When the energy storage unit 10 releases energy, the movable end 112 of the spring 11 drives the tail cover 13 to move in a second direction. The tail cover 13 drives the conveying unit 30, and the conveying unit 30 drives the impact unit 20 to move in a first direction. After passing through the first base 91 and the first buffer 93, the impact unit 20 drives the fastener in the fastener guide plate 50 into the workpiece. After the impact unit 20 moves along the first direction to drive the fastener into the workpiece, the impact unit 20 impacts the first buffer 93, and the tail cover 13 impacts the second buffer 94.

[0046] Since the impact unit 20 and spring 11 may still have residual energy after the fastener insertion is completed, the impact unit 20 and tail cover 13 will respectively impact the first and second buffers 93 and 94, absorbing this residual energy and preventing damage to other parts. It should be noted that when the overall output energy of the machine is relatively small, the second base 92 and the second buffer 94 are not necessary, and the guide rail 80 does not need to pass through the tail cover 13. The residual energy can be absorbed by the transmission unit 30 and the first buffer 93.

[0047] The following is combined Figure 8 The working principle of the fastener insertion machine 100 in this application is illustrated in the figure. Figure 8 The states a, b, c, and d in the diagram correspond to one work cycle.

[0048] The output shaft 430 rotates counterclockwise to the position shown in state a. At this time, the first cam 431 of the first engagement mechanism 43 of the drive unit 40 is about to engage with the first locking shaft 231 of the second engagement mechanism 23 of the impact unit 20. The output shaft 430 continues to rotate counterclockwise, the first cam 431 engages with the first locking shaft 231, and the drive unit 40 drives the impact unit 20 to move in the second direction. The impact unit 20 applies a force in the second direction to the conveyor belt 31. After the conveyor belt 31 passes through the fixed pulley 32, it applies a force in the first direction to the movable end 112 of the spring 11 of the energy storage unit 10, causing the spring 11 to be compressed in the first direction (the movable end 112 of the spring 11 moves in the first direction, and the fixed end 111 of the spring 11 is connected to the baffle 12, which is fixed to the housing 101). The output shaft 430 continues to rotate counterclockwise. The second cam 432 of the first engagement mechanism 43 of the drive unit 40 engages with the second retaining shaft 232 of the second engagement mechanism 23 of the impact unit 20. The first cam 431 disengages from the first retaining shaft 231, as shown in state b. The drive unit 40 continues to drive the impact unit 20 to move along the second direction. The impact unit 20 continues to apply a force along the first direction to the movable end 112 of the spring 11 of the energy storage unit 10 through the transmission unit 30, causing the spring 11 to continue to be compressed along the first direction. The output shaft 430 continues to rotate counterclockwise. The second cam 432 engages with the second retaining shaft 232. The drive unit 40 drives the impact unit 20 to move to the top dead center, as shown in state c. At the same time, the impact unit 20 compresses the spring 11 along the first direction through the transmission unit 30 to complete energy storage. The output shaft 430 continues to rotate counterclockwise, the second cam 432 disengages from the second retaining shaft 232, the spring 11 extends in the second direction, generating a force in the second direction on the conveyor belt 31. After passing the fixed pulley 32, the conveyor belt 31 generates a force in the first direction on the impact unit 20, causing the impact unit 20 to move in the first direction to complete the fastener driving action. After the fastener driving action is completed, the impact unit 20 impacts the first buffer 93, and the tail cap 13 connected to the movable end 112 of the spring 11 impacts the second buffer 94. The first buffer 93 absorbs the remaining energy of the impact unit 20, and the second buffer 94 absorbs the remaining energy of the energy storage unit 10, as shown in state d. The output shaft 430 continues to rotate counterclockwise. After rotating through a certain angle, the first cam 431 of the first engagement mechanism 43 of the drive unit 40 can re-engage with the first retaining shaft 231 of the second engagement mechanism 23 of the impact unit 20, returning to the state shown in state a.

[0049] When the impact unit 20 moves in the second direction, the conveyor belt 31 is subjected to a force in the second direction, which is converted into a force in the first direction on the movable end 112 of the spring 11 through the fixed pulley 32, thereby compressing the movable end 112 of the spring 11 in the first direction. Similarly, when the first engagement mechanism 43 of the drive unit 40 disengages from the second engagement mechanism 23 of the impact unit 20, the movable end 112 of the spring 11 is released in the second direction, and the conveyor belt 31 is subjected to a force in the second direction, which is converted into a force in the first direction on the impact unit 20 through the fixed pulley 32, causing the impact unit 20 to move in the first direction to complete the fastener driving action. In other words, when the impact unit 20 is performing the fastener driving action, the tail cap 13 connected to the movable end 112 of the spring 11 is moving in the opposite direction. According to the principle of momentum balance, the rebound momentum acting on the machine body, especially the handle, will be greatly reduced, and the rebound force felt by the user will also be greatly reduced.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has disclosed the preferred embodiment as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A fastener driving machine, characterized in that, include: An energy storage unit has an energy storage state and an energy release state; An impact unit is used to drive the energy storage unit to store energy and withstand the impact energy released by the energy storage unit to drive the fastener into the workpiece along a first direction. The impact unit includes a second engagement mechanism, which includes a first engagement structure and a second engagement structure. In the extension direction of the impact unit, the first engagement structure and the second engagement structure are disposed at different positions. A drive unit, which can cooperate with the impact unit, includes a first engagement mechanism, which comprises a first engagement structure and a second engagement structure; wherein... The energy storage process of the energy storage unit includes a first stage and a second stage. In the first stage, the first meshing structure engages with the first mating structure, causing the impact unit to drive the energy storage unit to store energy. In the second stage, the first meshing structure disengages from the first mating structure, and the second meshing structure engages with the second mating structure, causing the impact unit to drive the energy storage unit to store energy. The first meshing mechanism further includes an output shaft. Both the first meshing structure and the second meshing structure are mounted on the output shaft and rotate with the output shaft. The first meshing structure and the second meshing structure are offset along the axial direction of the output shaft. The first meshing structure periodically engages with or disengages from the first mating structure as it rotates with the output shaft, and the second meshing structure periodically engages with or disengages from the second mating structure as it rotates with the output shaft.

2. The fastener driving machine according to claim 1, characterized in that, The first meshing structure engages with the first mating structure to cause the drive unit to drive the impact unit to move along the second direction, and the second meshing structure engages with the second mating structure to cause the drive unit to drive the impact unit to move along the second direction; during one rotation cycle of the output shaft, the rotation angle of the first meshing structure while maintaining engagement with the first mating structure is less than 180°, and the rotation angle of the second meshing structure while maintaining engagement with the second mating structure is less than 180°.

3. The fastener driving machine according to claim 1, characterized in that, The first engagement structure is a first cam, and the second engagement structure is a second cam.

4. The fastener driving machine according to claim 1, characterized in that, The second engagement mechanism further includes a base, and the impact unit further includes a striker connected to the base. The striker is used to drive the fastener into the workpiece along the first direction. The first mating structure and the second mating structure are disposed on the base.

5. The fastener driving machine according to claim 4, characterized in that, The first mating structure is a first retaining shaft, and the second mating structure is a second retaining shaft.

6. The fastener driving machine according to claim 4, characterized in that, The first mating structure is installed on the base.

7. The fastener driving machine according to claim 1, characterized in that, The output shaft passes through at least a portion of the first engagement structure and at least a portion of the second engagement structure.

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