Fastening member driving machine

Abstract

To provide a fastening member driving machine that operates stably and smoothly.SOLUTION: An impact unit has an initial position, a first transition position, a second transition position, and an energy storage position. A propulsion unit has a first position corresponding to the first transition position, and a second position corresponding to the second transition position. The impact unit and the propulsion unit are in a non-coupling state at the initial position, both are coupled at the first transition position, and coupling is released at the second transition position. When the impact unit exists at the initial position, a drive unit is coupled to the impact unit to drive the impact unit, and after the impact unit has moved by a prescribed distance, the drive unit is coupled to the propulsion unit to drive the propulsion unit. The propulsion unit is coupled to the impact unit at the first position and moves the impact unit from the first transition position to the second transition position, and a return unit provides a return force for moving the propulsion from the second position to the first position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of power tools, and more particularly to fastener driving tools. [Background technology]

[0002] Typically, a fastener driving tool includes an energy storage device, a drive device, and an impact device. The impact device moves in a first direction by the action of energy released from the energy storage device to drive a fastener into a workpiece. The drive device includes a plurality of first meshing teeth, and the impact device includes a plurality of second meshing teeth. When the fastener driving tool operates, the plurality of first meshing teeth of the drive device sequentially mesh with the plurality of second meshing teeth of the impact device, causing the drive device to move the impact device in a second direction, and the energy storage device to store energy. In this case, the second direction is opposite to the first direction. When a fastener driving tool performs a driving operation, nail jamming may occur. When a nail jam occurs, the impact device may not stay in a position where it properly meshes with the drive device, which may prevent the fastener driving tool from operating normally.

[0003] Therefore, there is a need to provide a new fastener driving tool. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a fastener driving tool that operates reliably and smoothly. [Means for solving the problem]

[0005] The present invention first provides a fastener driving tool as follows.

[0006] The energy storage unit is for storing impact energy, The impact unit receives energy from the energy storage unit and drives the fastening member into the workpiece along a first direction, and the impact unit has an initial position, a first transition position, a second transition position, and an energy storage position, which are arranged in a direction opposite to the first direction; a propulsion unit for driving the impact unit, the propulsion unit having a first position corresponding to a first transition position and a second position corresponding to a second transition position; a drive unit for supplying power to the propulsion unit and the impact unit; a return unit providing a return force for returning the propulsion unit from the second position to the first position; In an initial position, the impact unit and the propulsion unit are not engaged, in a first transition position, the impact unit and the propulsion unit are engaged, and in a second transition position, the impact unit and the propulsion unit are disengaged; When the impact unit is in an initial position, the drive unit engages with the impact unit and drives the impact unit, and after the impact unit moves a predetermined distance, the drive unit engages with the propulsion unit and drives the propulsion unit, and the propulsion unit engages with the impact unit at the first position and moves the impact unit from the first transition position to the second transition position.

[0007] Secondly, the present invention also provides a fastener driving tool having the following configuration.

[0008] The energy storage unit is for storing impact energy, The impact unit receives energy from the energy storage unit and drives the fastening member into the workpiece along a first direction, and the impact unit has an initial position, a first transition position, a second transition position, and an energy storage position, which are arranged in a direction opposite to the first direction; a propulsion unit for driving the impact unit, the propulsion unit having a first position corresponding to a first transition position and a second position corresponding to a second transition position; a drive unit for supplying power to the propulsion unit and the impact unit; a return unit providing a return force for returning the propulsion unit from the second position to the first position; In an initial position, the impact unit and the propulsion unit are not engaged, in a first transition position, the impact unit and the propulsion unit are engaged, and in a second transition position, the impact unit and the propulsion unit are disengaged; When the impact unit is in an initial position, the drive unit simultaneously drives the impact unit and the propulsion unit, and the propulsion unit engages with the impact unit at the first position to move the impact unit from a first transition position to a second transition position.

[0009] Furthermore, the present invention also provides a fastener driving tool having the following configuration.

[0010] The energy storage unit is for storing impact energy, The impact unit receives energy from the energy storage unit and drives the fastening member into the workpiece along a first direction, and the impact unit has an initial position, a first transition position, a second transition position, and an energy storage position, which are arranged in a direction opposite to the first direction; a propulsion unit for driving the impact unit, the propulsion unit having an origin position, a first position corresponding to the first transition position, and a second position corresponding to the second transition position; a drive unit for supplying power to the propulsion unit and the impact unit; a return unit providing a return force for returning the propulsion unit from the second position to the first position; In an initial position, the impact unit and the propulsion unit are not engaged, in a first transition position, the impact unit and the propulsion unit are engaged, and in a second transition position, the impact unit and the propulsion unit are disengaged; The driving unit is configured to simultaneously drive the propulsion unit and the impact unit, and in the process of the propulsion unit moving from the starting position to the first position, the propulsion unit catches up with the impact unit, and after reaching the first position, the propulsion unit and the impact unit engage with each other, and the propulsion unit moves the impact unit from the first transition position to the second transition position.

[0011] Next, the present invention also provides a fastener driving tool having the following configuration.

[0012] The energy storage unit is for storing impact energy, The impact unit receives energy from the energy storage unit and drives the fastener into the workpiece along a first direction, and the impact unit has an initial position, a transition position, and an energy storage position, which are arranged in a direction opposite to the first direction; a propulsion unit that engages the impact unit to move the impact unit from an initial position to a transition position, the propulsion unit having a first position corresponding to the initial position and a second position corresponding to the transition position; a drive unit that couples with or disengages from the propulsion unit; a return unit providing a return force for returning the propulsion unit from the second position to the first position; When the impact unit is in the transition position, the propulsion unit is in the second position, and the return unit separates the propulsion unit from the impact unit in the second position.

[0013] In addition, the present invention also provides a fastener driving tool having the following configuration.

[0014] The energy storage unit is for storing impact energy, The impact unit receives energy from the energy storage unit and drives the fastening member into the workpiece along a first direction, and the impact unit has an initial position and an energy storage position; a propulsion unit for moving the impact unit from an initial position to an energy-storing position, the propulsion unit having a first position corresponding to the initial position and a second position corresponding to the energy-storing position; a drive unit that is coupled to or disengaged from the propulsion unit and has a coupled state and a disengaged state; The return unit provides a return force for returning the propulsion unit from the second position to the first position. [Effects of the Invention]

[0015] In the present invention, the drive unit and the propulsion unit are linked together, and the propulsion unit and the impact unit are linked together. That is, the drive unit indirectly drives the impact unit through the propulsion unit. Furthermore, the propulsion unit can be independently reset by the reset unit. Even if the impact unit stops in an abnormal position due to nail jamming, the drive unit always properly links with the propulsion unit and drives the propulsion unit to the impact unit that is stopped in the abnormal position, thereby ensuring that the propulsion unit and the impact unit are properly linked again. By implementing the fastener driving tool of the present invention, nail jamming can be avoided and normal operation can be performed. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic structural view of a fastening member driving tool (partial structure is omitted) according to a first embodiment of the present invention. [Figure 2] 2 is a structural schematic diagram of the fastener driving tool shown in FIG. 1 from one perspective; FIG. [Figure 3] 3 is a cross-sectional view of the fastener driving tool shown in FIG. 2 along line AA. [Figure 4]2 is a structural schematic diagram of the fastener driving tool shown in FIG. 1 from one perspective; FIG. [Figure 5] 5 is a cross-sectional view taken along line BB of the fastener driving tool shown in FIG. 4. [Figure 6] 2 is a schematic view of a partial structure of the fastener driving tool shown in FIG. 1. [Figure 7] 7 is a structural schematic diagram of a part of the structure of the fastener driving tool shown in FIG. 6 from another perspective. [Figure 8] 8 is a structural view of a portion of the fastening member driving tool shown in FIG. 7 from still another perspective. FIG. [Figure 9] 9 is a cross-sectional view taken along CC of a partial structure of the fastening member driving tool shown in FIG. 8. FIG. [Figure 10] FIG. 6 is a structural schematic diagram of the impact unit and piston shown in FIG. 5; [Figure 11] 1A to 1C are diagrams showing the various states of one work cycle of a fastening member driving tool according to a first embodiment of the present invention. [Figure 12] 3A to 3C are diagrams illustrating the various states of a work cycle when the fastening member driving tool according to the first embodiment of the present invention is in a nail jamming state. [Figure 13] FIG. 10 is a schematic three-dimensional view of a partial structure of a fastening member driving tool according to a second embodiment of the present invention. [Figure 14] 10A to 10C are diagrams showing the various states of one working cycle of a fastening member driving tool according to a second embodiment of the present invention. [Figure 15] 10A to 10C are diagrams showing the various states of a work cycle when a fastening member driving tool according to a second embodiment of the present invention is in a nail jamming state. [Figure 16] FIG. 10 is a schematic three-dimensional view of a partial structure of a fastening member driving tool according to a third embodiment of the present invention. [Figure 17] FIG. 17 is a structural view of the fastener driving tool shown in FIG. 16 from one perspective. [Figure 18] 18 is a cross-sectional view of the fastener driving tool shown in FIG. 17 taken along line AA. [Figure 19] FIG. 17 is a structural view of the fastener driving tool shown in FIG. 16 from one perspective. [Figure 20] 20 is a cross-sectional view taken along line BB of the fastener driving tool shown in FIG. 19. [Figure 21] 17 is a three-dimensional view of a partial structure of the fastening member driving tool shown in FIG. 16. [Figure 22] FIG. 21 is a structural diagram of the impact unit and piston shown in FIG. 20. [Figure 23] 17 is a structural view of a portion of the fastening member driving tool shown in FIG. 16 from one perspective. FIG. [Figure 24] 24 is a cross-sectional view taken along CC of a portion of the structure of the fastening member driving tool shown in FIG. 23. FIG. [Figure 25] 10A to 10C are diagrams showing the various states of one working cycle of a fastening member driving tool according to a third embodiment of the present invention. [Figure 26] 10A to 10C are diagrams showing the various states of a work cycle when a fastening member driving tool according to a third embodiment of the present invention is in a nail jamming state. [Figure 27] FIG. 10 is a schematic three-dimensional view of a partial structure of a fastening member driving tool according to a fourth embodiment of the present invention. [Figure 28] 10A to 10C are diagrams showing the various states of one working cycle of a fastening member driving tool according to a fourth embodiment of the present invention. [Figure 29] 10A to 10C are diagrams showing the various states of a work cycle when a fastening member driving tool according to a fourth embodiment of the present invention is in a nail jamming state. DETAILED DESCRIPTION OF THE INVENTION

[0017] Exemplary embodiments will now be described in detail. These examples are illustrated in the accompanying drawings, and as referred to in the following description, unless otherwise indicated, the same numerals in different drawings refer to the same or similar elements. The embodiments described in this specification do not necessarily encompass all embodiments corresponding to the present invention.

[0018] The terms used herein are used only for the purpose of describing particular embodiments and are not intended to limit the present invention. Unless otherwise defined, technical and scientific terms used herein have their ordinary meanings as understood by those of ordinary skill in the art. Terms such as "first" and "second" used herein do not denote order, quantity, or importance, but are used to distinguish between different components. Similarly, terms such as "one" or "1" do not denote a limitation of quantity, but rather indicate the presence of at least one. "Multiple" or "some" indicate two or more. Unless otherwise specified, terms such as "front," "rear," "lower," and "upper" are used for convenience of description and do not limit position or spatial orientation. Terms such as "comprise" and "include" include the elements or items listed after "comprise" or "include," as well as equivalent elements or items, and do not exclude other elements or items. Terms such as "connect" and "couple" are not limited to physical or mechanical connections, but may include direct or indirect electrical connections. As used in the present specification and the appended claims, the singular forms "a," "the," "said," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. Also, as used herein, the term "and / or" is meant to include any and all possible combinations of the associated listed items.

[0019] 1 to 12, a first embodiment of the present invention provides a fastener driving tool, which includes an energy storage unit 10, an impact unit 20, a propulsion unit 30, a drive unit 40, a support unit, and a return unit 60. The support unit supports the energy storage unit 10, the impact unit 20, the propulsion unit 30, and the drive unit 40. The drive unit 40 supplies power to the propulsion unit 30 and the impact unit 20. The return unit 60 has a first end and a second end arranged in opposite directions, the first end connected to the support unit, and the second end connected to the propulsion unit 30. The support unit includes a base 51, and the fastener driving tool further includes a fastener guide plate 52 and a fastener storage clip 53. The fastener storage clip 53 is connected to the fastener guide plate 52, and fasteners (not shown) are stored in the fastener storage clip 53. The fastener storage clip 53 can feed fasteners to the fastener guide plate 52, and the fastener guide plate 52 serves to guide the fasteners. The fasteners are driven into the workpiece by the impact unit 20. In the present invention, the fasteners are nails, the fastener guide plate 52 functions as a guide plate, and the fastener storage clip 53 functions as a nail clip.

[0020] The energy storage unit 10 is a medium that stores energy by changing its position, and includes, for example, an air spring, a mechanical spring, a rubber part, etc. In the present invention, the energy storage unit 10 is an air spring, and includes a cylinder 11, a piston 12, and a seal ring 13. The cylinder 11 and the piston 12 form an enclosed space containing gas therein, and the space between the cylinder 11 and the piston 12 is sealed by the seal ring 13.

[0021] One end of the impact unit 20 is connected to the piston 12, and the other end of the impact unit 20 is used to drive a fastener into a workpiece. The impact unit 20 can move together with the piston 12. The energy storage unit 10 is used to store impact energy. When the energy storage unit 10 releases the impact energy, the impact unit 20 receives the energy released from the energy storage unit 10 and drives the fastener into the workpiece along the first direction X.

[0022] The impact unit 20 has an initial position, a first transition position, a second transition position, and an energy storage position, which are arranged in opposite directions with respect to the first direction X. The first transition position and the second transition position are located between the initial position and the energy storage position. The piston 12 has a top dead center corresponding to the energy storage position and a bottom dead center corresponding to the initial position. When the impact unit 20 is in the energy storage position, the piston 12 is at the top dead center, and the energy storage unit 10 is in a state of storing energy. When the impact unit 20 is in the initial position, the piston 12 is at the bottom dead center, and at this time, the energy storage unit 10 is in a state of releasing energy. The propulsion unit 30 has an origin position, a first position corresponding to the first transition position, and a second position corresponding to the second transition position. That is, "the propulsion unit 30 has a first position corresponding to the first transition position" means that the propulsion unit 30 is in the first position when the impact unit 20 is in the first transition position, and "the propulsion unit 30 has a second position corresponding to the second transition position" means that the propulsion unit 30 is in the second position when the impact unit 20 is in the second transition position.

[0023] At the initial position, the impact unit 20 and the propulsion unit 30 are not engaged with each other. At the first transition position, the impact unit 20 and the propulsion unit 30 are engaged with each other. At the second transition position, the impact unit 20 and the propulsion unit 30 are disengaged from each other. The drive unit 40 engages with the impact unit 20 and drives the impact unit 20 from the initial position toward the first transition position. After the impact unit 20 moves a predetermined distance, the drive unit 40 engages with the propulsion unit 30 and drives the propulsion unit 30 from the starting position toward the first position. Because the moving speed of the impact unit 20 is slower than the moving speed of the propulsion unit 30, the propulsion unit 30 catches up with the impact unit 20, and the propulsion unit 30 and the impact unit 20 engage with each other at the first position. At this time, the impact unit 20 is located at the first transition position. The propulsion unit 30 engages with the impact unit 20 at the first position and drives the impact unit 20 from the first transition position toward the second transition position. After the impact unit 20 reaches the second transition position, the drive unit 40 engages with the impact unit 20 and drives the impact unit 20 from the second transition position towards the energy storage position.

[0024] The drive unit 40 has a state of being engaged or disengaged with the propulsion unit 30, i.e., the drive unit 40 has a state of being engaged with the propulsion unit 30 and a state of being disengaged. Before the propulsion unit 30 engages with the impact unit 20, the drive unit 40 engages with the impact unit 20 and drives the impact unit 20 from the initial position to the first transition position. In the process of the drive unit 40 driving the impact unit 20 from the initial position to the first transition position, the drive unit 40 engages with the propulsion unit 30. When the drive unit 40 and the propulsion unit 30 are engaged, the drive unit 40 drives the propulsion unit 30 from the initial position to the first position, and the propulsion unit 30 engages with the impact unit 20 at the first position and drives the impact unit 20 from the first transition position to the second transition position. The impact unit 20 drives the piston 12. When the propulsion unit 30 and the impact unit 20 are engaged, the drive unit 40 begins to disengage from the impact unit 20. As the propulsion unit 30 drives the impact unit 20, the drive unit 40 again engages with the impact unit 20, and the drive unit 40 begins to disengage from the propulsion unit 30. When the drive unit 40 disengages from the propulsion unit 30, the impact unit 20 is in the second transition position, and the propulsion unit 30 is in the second position. At this time, the propulsion unit 30 returns from the second position to the first position under the action of the return unit 60, and moves until it returns to the starting position. The impact unit 20 disengages from the propulsion unit 30 at the second transition position, and the drive unit 40 engages with the impact unit 20, driving the impact unit 20 from the second transition position to the energy storage position. When the impact unit 20 reaches the energy storage position, the piston 12 is at the top dead center, and the energy storage unit 10 is storing energy. The return unit 60 provides a return force that returns the propulsion unit 30 from the second position to the first position and back to the starting position, and when the propulsion unit 30 moves from the second position to the first position due to the action of the return unit 60, the impact unit 20 disengages from the propulsion unit 30 at the second transition position.The return unit 60 extends along the operating direction of the impact unit 20. In the present invention, the return unit 60 is a tension spring, which has a first end and a second end. The first end of the tension spring is attached to a first hook 90, which is fixed to the fastening member guide plate 52. The second end of the tension spring is connected to the propulsion unit 30. Specifically, the propulsion unit 30 includes a second hook 32, and the second end of the tension spring is attached to the second hook 32. When the propulsion unit 30 is in the second position, the tension spring is in an extended state.

[0025] The propulsion unit 30 includes a recess 31 on the opposite side of the fastening member, and the recess 31 is open in the opposite direction to the first direction X. The impact unit 20 includes a protrusion 21 that engages with the recess 31. When the propulsion unit 30 moves from the starting position to the first position, the protrusion 21 enters the recess 31. When the propulsion unit 30 moves from the first position to the second position, the protrusion 21 is in the recess 31, and the impact unit 20 is pushed in the opposite direction to the first direction X by the propulsion unit 30. When the propulsion unit 30 returns from the second position to the first position due to the action of the return unit 60, the protrusion 21 begins to move away from the recess 31. In this embodiment, the propulsion unit 30 is a rack, and the protrusion 21 is a pin attached to the body of the impact unit 20.

[0026] The drive unit 40 includes a motor 43, an output shaft 410, a reduction mechanism 42, and a drive mechanism 41, and the motor 43 supplies power to the drive mechanism 41. The drive mechanism 41 includes a drive wheel 411, a first meshing structure 44, and a second meshing structure 45, and the drive wheel 411 is attached to the output shaft 410. The impact unit 20 includes a first protrusion 23 and a second protrusion 22. The first meshing structure 44 meshes with the first protrusion 23 to drive the impact unit 20 from the initial position to the first transition position, and the second meshing structure 45 meshes with the second protrusion 22 to drive the impact unit 20 from the second transition position to the energy storage position. The drive wheel 411 has meshing and non-meshing regions set along its periphery. The meshing region meshes with the teeth of the propulsion unit 30 to form a meshed state. Specifically, the meshing region includes a plurality of first meshing teeth 413, and the propulsion unit 30 includes a plurality of second meshing teeth 33. The first meshing teeth 413 sequentially mesh with the second meshing teeth 33 to form a meshed state. A first meshing structure 44 is provided on the first first meshing tooth 413 in the meshing region of the drive wheel 411. The meshing region of the drive wheel 411 begins to mesh with the teeth of the propulsion unit 30 through the first first meshing tooth 413, and the first meshing structure 44 and the first meshing tooth 413 are arranged adjacent to each other in the axial direction of the output shaft 410. The second meshing structure 45 and the drive wheel 411 are arranged on different planes in the axial direction of the output shaft 410. The drive mechanism 41 includes a crank 412 attached to an output shaft 410. The crank 412 includes a pin shaft and a bushing attached to the pin shaft, and the pin shaft and bushing function as a second interlocking structure 45. The second interlocking structure 45 interlocks with the second protrusion 22 of the impact unit 20. The bushing serves to reduce friction and is not essential for achieving the interlocking function. The second interlocking structure 45 can be either engaged with or disengaged from the second protrusion 22. When the second protrusion 22 is disengaged from the second interlocking structure 45, the impact unit 20 drives the fastener into the workpiece by the action of impact energy released by the energy storage unit 10.

[0027] In the process of the drive unit 40 driving the impact unit 20 from the initial position to the first transition position, the first meshing teeth 413 in the meshing region of the drive wheel 411 of the drive mechanism 41 of the drive unit 40 begin to mesh with the second meshing teeth 33 of the propulsion unit 30. When the drive unit 40 is meshed with the propulsion unit 30, the drive unit 40 drives the propulsion unit 30 from the initial position toward the first position, and the propulsion unit 30 meshes with the impact unit 20 at the first position, driving the impact unit 20 from the first transition position to the second transition position. At this time, the meshing between the first meshing structure 44 and the first protrusion 23 is released. After the first meshing teeth 413 in the meshing area of ​​the drive wheel 411 disengage from the second meshing teeth 33 of the propulsion unit 30, the second meshing structure 45 and the second protrusion 22 mesh, and the second meshing structure 45 drives the impact unit 20 from the second transition position to the energy storage position.

[0028] Specifically, the output shaft 410 starts to rotate when the motor 43 is driven, and the drive wheel 411 and the crank 412 rotate together with the output shaft 410. The first meshing structure 44 provided on the first meshing tooth 413 meshes with the first protrusion 23, driving the impact unit 20 from the initial position to the first transition position. During the process of the impact unit 20 moving from the initial position to the first transition position, the first meshing tooth 413 in the meshing region of the drive wheel 411 begins to mesh with the second meshing tooth 33 of the propulsion unit 30. When the first meshing tooth 413 in the meshing region of the drive wheel 411 meshes with the second meshing tooth 33 of the propulsion unit 30, the drive wheel 411 drives the propulsion unit 30 from the initial position to the first position. The propulsion unit 30 meshes with the impact unit 20 at the first position, driving the impact unit 20 from the first transition position to the second transition position. At this time, the first meshing structure 44 and the first protrusion 23 are disengaged. During the process in which the propulsion unit 30 drives the impact unit 20 from the first transition position to the second transition position, the second meshing structure 45 meshes with the second protrusion 22, driving the impact unit 20 to the energy storage position. During the process in which the second meshing structure 45 meshes with the second protrusion 22 to drive the impact unit 20 to the energy storage position, the first meshing teeth 413 in the meshing area of ​​the drive wheel 411 and the second meshing teeth 33 of the propulsion unit 30 are disengaged. When the first meshing teeth 413 in the meshing area of ​​the drive wheel 411 and the second meshing teeth 33 of the propulsion unit 30 are disengaged, the propulsion unit 30 is in the second position, and the impact unit 20 is in the second transition position. At this time, the propulsion unit 30 returns from the second position to the first position under the action of the return unit 60, and moves until it returns to the starting position. The second interlocking structure 45 is interlocked with the second protrusion 22, and the driving unit 40 drives the impact unit 20 from the second transition position to the energy storage position. When the impact unit 20 reaches the energy storage position, the second interlocking structure 45 and the second protrusion 22 are disengaged, and the impact unit 20 drives the fastener into the workpiece along the first direction X by the action of the impact energy released by the energy storage unit 10.

[0029] The propulsion unit 30 is disposed opposite the drive wheel 411 along a second direction Y. The propulsion unit 30 includes a meshing tooth region, and the return unit 60 is disposed on the opposite side of the meshing tooth region from the drive wheel 411 in the second direction Y. The second direction Y is perpendicular to the first direction X. The return unit 60 is disposed alongside the impact unit 20 along a third direction Z. The third direction Z is perpendicular to the first direction X and the second direction Y.

[0030] Specifically, the reduction mechanism 42 is a gear transmission mechanism, which is used to reduce the rotational speed and increase the torque. The gear transmission mechanism may include a one-stage or multi-stage planetary gear transmission, and in the present invention, it includes a three-stage planetary gear transmission. The gear transmission mechanism includes a one-way clutch that prevents the force released by the energy storage unit 10 from rotating the drive mechanism 41 in reverse when the drive mechanism 41 is engaged with the propulsion unit 30 or the impact unit 20 and the motor 43 is not supplying torque. The rotational speed and torque output by the motor 43 are transmitted to the output shaft 410 via the gear transmission mechanism, allowing the drive wheel 411 and crank 412 to rotate together with the output shaft 410. A circlip is attached to the output shaft 410 to prevent the drive wheel 411 and crank 412 from falling off the output shaft 410.

[0031] The support unit further includes a guide rail 54, which is attached to the base 51. The guide rail 54 has two grooves, and the impact unit 20 and the propulsion unit 30 are respectively attached to the two grooves. The two grooves thus function as guides for the impact unit 20 and the propulsion unit 30, allowing them to move linearly. The fastener driving tool further includes a first buffer 70 attached to the fastener guide plate 52. The first buffer 70 contacts the propulsion unit 30 when the propulsion unit 30 returns to its starting position by the action of the return unit 60. The first buffer 70 absorbs impact energy generated when the propulsion unit 30 returns and any impact that the impact unit 20 may apply to the propulsion unit 30. The first buffer 70 also limits the distance the propulsion unit 30 moves in the first direction X. The fastener driving tool further includes a second buffer 80 provided between the base 51 and the piston 12. When the impact unit 20 stores energy in the energy storage unit 10, the impact unit 20 moves the piston 12 away from the second buffer part 80. When the impact unit 20 receives the energy released from the energy storage unit 10 and drives the fastener into the workpiece, the piston 12 moves the impact unit 20 toward the second buffer part 80 until the piston 12 collides with the second buffer part 80. When the impact unit 20 completes the fastener driving operation, the remaining energy in the piston 12 is absorbed or dissipated by the second buffer part 80. This design prevents damage to the impact unit 20. At the same time, the second buffer part 80 limits the distance the impact unit 20 can move in the first direction X.

[0032] See states a, b, c, d, e, f, g, h, and i in Figure 11. Referring to states a to i above, these states correspond to one working cycle. State a is the initial state of the working cycle. At this time, the impact unit 20 is in the preload position, and the piston 12 is close to but has not yet reached the top dead center. The second protrusion 22 of the impact unit 20 engages with the second meshing structure 45 (i.e., the pin shaft and the shaft bushing), and the propulsion unit 30 returns to its starting position and is in close contact with the first buffer part 70. When the output shaft 410 rotates counterclockwise, as shown in state b, the output shaft 410 rotates the drive wheel 411 and the crank 412. The second meshing structure 45 engages with the second protrusion 22, driving the impact unit 20 in the opposite direction of the first direction X. As a result, the impact unit 20 moves the piston 12 in the opposite direction of the first direction X, and the piston 12 reaches the top dead center. As the output shaft 410 continues to rotate counterclockwise, the second protrusion 22 of the impact unit 20 disengages from the second interlocking structure 45, as shown in state c. The impact unit 20 then moves in the first direction X due to the force released by the energy storage unit 10, driving the fastener into the workpiece. After the fastener driving operation is completed, the piston 12 collides with the second buffer 80, stops at the bottom dead center, and the impact unit 20 returns to its initial position. The output shaft 410 continues to rotate the drive wheel 411 and the crank 412 counterclockwise, and as shown in state d, the first interlocking structure 44 interlocks with the first protrusion 23, driving the impact unit 20 in the opposite direction to the first direction X. Specifically, the first meshing structure 44 meshes with the first protrusion 23, driving the impact unit 20 from the initial position to the first transition position, and the first meshing tooth 413 of the meshing area of ​​the drive wheel 411 is about to mesh with the second meshing tooth 33 of the propulsion unit 30.

[0033] As the output shaft 410 continues to rotate counterclockwise, the first meshing teeth 413 of the meshing region of the drive wheel 411 begin to mesh with the second meshing teeth 33 of the propulsion unit 30, as shown in state e, causing the propulsion unit 30 to move in the opposite direction of the first direction X. As the output shaft 410 continues to rotate counterclockwise, the drive wheel 411 drives the propulsion unit 30 from the starting position to the first position. Because the moving speed of the impact unit 20 is slower than that of the propulsion unit 30, the propulsion unit 30 moves in the opposite direction of the first direction X to catch up with the impact unit 20, and the propulsion unit 30 meshes with the impact unit 20 at the first position (specifically, the recess 31 of the propulsion unit 30 meshes with the protrusion 21 of the impact unit 20). At this point, the impact unit 20 is in the first transition position, and the propulsion unit 30 is in the first position (state f). The first meshing structure 44 is about to disengage from the first protrusion 23. As the output shaft 410 continues to rotate counterclockwise, as shown in state g, the output shaft 410 rotates the drive wheel 411 and the crank 412, which in turn drives the propulsion unit 30, which then moves the impact unit 20 from the first transition position to the second transition position. The impact unit 20 then moves the piston 12 in the opposite direction of the first direction X, compressing the air spring. The first meshing structure 44 has already disengaged from the first protrusion 23. As the output shaft 410 continues to rotate counterclockwise, as shown in state h, the second meshing structure 45 (the pin shaft and the shaft bushing) begins to mesh with the second protrusion 22 of the impact unit 20, and at the same time, the first meshing teeth 413 of the drive wheel 411 are about to disengage from the second meshing teeth 33 of the propulsion unit 30. As the output shaft 410 continues to rotate counterclockwise, the first meshing teeth 413 of the drive wheel 411 disengage from the second meshing teeth 33 of the propulsion unit 30, as shown in state i. At this point, the propulsion unit 30 is in the second position, and the return unit 60 causes the propulsion unit 30 to move from the second position toward the first position and finally return to the initial position. The propulsion unit 30 returns to the initial position while coming into close contact with the first buffer section 70.At the same time, the impact unit 20 is in the second transition position, and the second meshing structure 45 and the second protrusion 22 mesh with each other, driving the impact unit 20 from the second transition position to the energy storage position. The impact unit 20 moves the piston 12 and compresses the air spring. As the output shaft 410 further rotates counterclockwise, the second meshing structure 45 and the second protrusion 22 mesh with each other, driving the impact unit 20 to the preload position and then stopping (state a). This completes the work cycle.

[0034] Referring to FIG. 12 , if nail jamming occurs for some reason, the fastener may become stuck in the fastener guide plate 52. At this point, the impact unit 20 may stop at any position along the first direction X (state j). Because the propulsion unit 30 and the impact unit 20 are not fixed, the propulsion unit 30 returns to its initial position by the action of the return unit 60 and comes into close contact with the first buffer 70. This allows the first meshing teeth 413 of the meshing area of ​​the drive wheel 411 to properly mesh with the second meshing teeth 33 of the propulsion unit 30. As the output shaft 410 continues to rotate counterclockwise, as shown in state k, depending on the position at which the impact unit 20 stops, the first meshing structure 44 cannot mesh with the first protrusion 23. However, the first meshing teeth 413 of the meshing area of ​​the drive wheel 411 directly mesh with the second meshing teeth 33 of the propulsion unit 30, moving the propulsion unit 30 in the opposite direction of the first direction X. When the output shaft 410 further rotates counterclockwise, as shown in state l, the first meshing teeth 413 of the meshing region of the drive wheel 411 mesh with the second meshing teeth 33 of the propulsion unit 30, and the drive wheel 411 continues to move the propulsion unit 30 in the opposite direction of the first direction X, and the propulsion unit 30 again meshes with the impact unit 20. The propulsion unit 30 drives the impact unit 20, and the impact unit 20 moves the piston 12 in the opposite direction of the first direction X and compresses the air spring.

[0035] As the output shaft 410 continues to rotate counterclockwise, as shown in state h, the second meshing structure 45 (pin shaft and shaft bushing) begins to mesh with the second protrusion 22 of the impact unit 20, and at the same time, the first meshing tooth 413 of the drive wheel 411 attempts to disengage from the second meshing tooth 33 of the propulsion unit 30.

[0036] As the output shaft 410 continues to rotate counterclockwise, the first meshing teeth 413 of the meshing area of ​​the drive wheel 411 disengage from the second meshing teeth 33 of the propulsion unit 30, as shown in state i. At this point, the propulsion unit 30 is in the second position, and due to the action of the return unit 60, the propulsion unit 30 moves from the second position toward the first position and finally returns to the initial position. The propulsion unit 30 returns to the initial position while closely adhering to the first buffer part 70. At the same time, the impact unit 20 is in the second transition position, and the second meshing structure 45 and the second protrusion 22 mesh with each other, driving the impact unit 20 from the second transition position to the energy storage position. The impact unit 20 moves the piston 12 and compresses the air spring. As the output shaft 410 continues to rotate counterclockwise, the second meshing structure 45 and the second protrusion 22 mesh with each other, driving the impact unit 20 to the preload position and then stopping (state a). This completes the work cycle.

[0037] Referring to Figures 13 to 15, a second embodiment of the present invention also provides a fastener driving tool. Figure 13 shows a schematic diagram of a structure different from that of the first embodiment; for other structures, please refer to Figures 1 to 10. The fastener driving tool includes an energy storage unit 10, an impact unit 20, a propulsion unit 30, a drive unit 40, a support unit, and a return unit 60. The support unit supports the energy storage unit 10, the impact unit 20, the propulsion unit 30, and the drive unit 40. The drive unit 40 supplies power to the propulsion unit 30 and the impact unit 20. The energy storage unit 10 is a medium that stores energy through a change in position, and may include, for example, an air spring, a mechanical spring, or a rubber part. In this embodiment, the energy storage unit 10 is an air spring, and includes a cylinder 11, a piston 12, and a seal ring 13. The cylinder 11 and the piston 12 form an enclosed space containing gas, and the gap between the cylinder 11 and the piston 12 is sealed by the seal ring 13. One end of the impact unit 20 is connected to the piston 12, and the other end of the impact unit 20 is used to drive a fastener into a workpiece. The impact unit 20 can move together with the piston 12. The energy storage unit 10 is used to store impact energy. When the energy storage unit 10 releases the impact energy, the impact unit 20 receives the energy released from the energy storage unit 10 and drives the fastener into the workpiece along the first direction X.

[0038] The impact unit 20 has an initial position, a first transition position, a second transition position, and an energy storage position, which are arranged in opposite directions with respect to the first direction X. The first transition position and the second transition position are located between the initial position and the energy storage position. The propulsion unit 30 has an origin position, a first position corresponding to the first transition position, and a second position corresponding to the second transition position. "The propulsion unit 30 has a first position corresponding to the first transition position" means that the propulsion unit 30 is in the first position when the impact unit 20 is in the first transition position, and "The propulsion unit 30 has a second position corresponding to the second transition position" means that the propulsion unit 30 is in the second position when the impact unit 20 is in the second transition position.

[0039] The propulsion unit 30 engages with the impact unit 20 to drive the impact unit 20, and the propulsion unit 30 drives the impact unit 20 from the first transition position to the second transition position. In the initial position, the impact unit 20 and the propulsion unit 30 are disengaged, in the first transition position the impact unit 20 and the propulsion unit 30 are engaged, and in the second transition position the impact unit 20 and the propulsion unit 30 are disengaged.

[0040] When the impact unit 20 is in the initial position, the drive unit 40 simultaneously drives the impact unit 20 and the propulsion unit 30 (i.e., the drive unit 40 engages with the impact unit 20 and drives the impact unit 20 from the initial position toward the first transition position, and at the same time, the drive unit 40 engages with the propulsion unit 30 and drives the propulsion unit 30 from the starting position toward the first position). Because the moving speed of the impact unit 20 is slower than the moving speed of the propulsion unit 30, the propulsion unit 30 catches up with the impact unit 20, and the propulsion unit 30 engages with the impact unit 20 at the first position. At this point, the impact unit 20 is in the first transition position. When the propulsion unit 30 and the impact unit 20 engage, the drive unit 40 attempts to disengage from the impact unit 20. The propulsion unit 30 drives the impact unit 20 and moves the impact unit 20 from the first transition position to the second transition position. As the propulsion unit 30 drives the impact unit 20 from the first transition position to the second transition position, the drive unit 40 again engages with the impact unit 20. After the impact unit 20 reaches the second transition position, the drive unit 40 engages with the impact unit 20 and drives the impact unit 20 from the second transition position toward the energy storage position.

[0041] The fastener driving tool further includes a return unit 60, which provides a return force for returning the propulsion unit 30 from the second position to the first position. The return force of the return unit 60 causes the propulsion unit 30 to return from the second position to the first position.

[0042] The drive unit 40 has a state in which it is engaged with the propulsion unit 30 or a state in which it is disengaged from the propulsion unit 30. The drive unit 40 includes a motor 43, an output shaft 410, a reduction mechanism 42, and a drive mechanism 41. The motor 43 supplies power to the drive mechanism 41. The drive mechanism 41 includes a drive wheel 411 attached to the output shaft 410. The drive wheel 411 has an engaged region and a non-engaged region provided along its circumference. The engaged region engages with the teeth of the propulsion unit 30 to form an engaged state.

[0043] The propulsion unit 30 includes a recessed groove 31 that opens in the opposite direction to the first direction X. The impact unit 20 includes a protrusion 21 that engages with the recessed groove 31. As the propulsion unit 30 moves from the starting position to the first position, the protrusion 21 enters the recessed groove 31. As the propulsion unit 30 moves from the first position to the second position, the protrusion 21 is inside the recessed groove 31, and the impact unit 20 is pushed in the opposite direction to the first direction X by the propulsion unit 30. As the propulsion unit 30 returns from the second position to the first position, the protrusion 21 begins to move away from the recessed groove 31.

[0044] The impact unit 20 includes a first protrusion 23 and a second protrusion 22. The drive mechanism 41 includes a first interlocking structure 44 and a second interlocking structure 45, and the first interlocking structure 44 is provided in the interlocking region. The first interlocking structure 44 interlocks with the first protrusion 23 to drive the impact unit 20 from the initial position toward the first transition position. The second interlocking structure 45 interlocks with the second protrusion 22 to drive the impact unit 20 from the second transition position toward the energy storage position. When the impact unit 20 is in the initial position, the first interlocking structure 44 interlocks with the first protrusion 23 to drive the impact unit 20, and at the same time, the drive unit 40 interlocks with the propulsion unit 30 to drive the propulsion unit 30.

[0045] The states a to h in FIG. 14 correspond to one work cycle.

[0046] State a is the initial state of the working cycle. At this time, the impact unit 20 is in the preload position, and the piston 12 is close to but has not yet reached the top dead center. The second protrusion 22 of the impact unit 20 is engaged with the second meshing structure 45 (pin shaft and shaft bushing), and the propulsion unit 30 has returned to its starting position and is in close contact with the first buffer part 70. When the output shaft 410 rotates counterclockwise, as shown in state b, the output shaft 410 rotates the drive wheel 411 and the crank 412, and the second meshing structure 45 engages with the second protrusion 22 to drive the impact unit 20 in the opposite direction of the first direction X. As a result, the impact unit 20 moves the piston 12 in the opposite direction of the first direction X, and the piston 12 reaches the top dead center. As the output shaft 410 continues to rotate counterclockwise, the second protrusion 22 of the impact unit 20 disengages from the second interlocking structure 45, as shown in state c. The impact unit 20 moves in the first direction X due to the force released by the energy storage unit 10, driving the fastener into the workpiece. After the fastener driving operation is completed, the piston 12 collides with the second buffer part 80, the piston 12 stops at the bottom dead center, and the impact unit 20 returns to its initial position. The output shaft 410 continues to rotate the drive wheel 411 and the crank 412 counterclockwise, and as shown in state d, the first interlocking teeth 413 of the interlocking area of ​​the drive wheel 411 begin to interlock with the second interlocking teeth 33 of the propulsion unit 30, causing the propulsion unit 30 to move in the opposite direction to the first direction X. That is, the driving wheel 411 drives the propulsion unit 30 from the starting position to the first position, and at the same time, the first meshing structure 44 meshes with the first protrusion 23 to move the impact unit 20 in the opposite direction to the first direction X, thereby driving the impact unit 20 from the initial position toward the first transition position.

[0047] As the output shaft 410 continues to rotate counterclockwise, as shown in state e, the speed of the impact unit 20 is slower than that of the propulsion unit 30, so the propulsion unit 30 moves in the opposite direction of the first direction X and catches up with the impact unit 20. As a result, the propulsion unit 30 engages with the impact unit 20 at the first position (i.e., the recesses 31 of the propulsion unit 30 engage with the protrusions 21 of the impact unit 20). When the propulsion unit 30 is in the first position, the impact unit 20 is in the first transition position. At this point, the first engagement structure 44 is about to disengage from the first protrusion 23. As the output shaft 410 continues to rotate counterclockwise, as shown in state f, the output shaft 410 rotates the drive wheel 411 and the crank 412. The drive wheel 411 drives the propulsion unit 30, which then moves the impact unit 20 from the first transition position to the second transition position. The impact unit 20 moves the piston 12 in the opposite direction to the first direction X, compressing the air spring. The first meshing structure 44 has already disengaged from the first protrusion 23. As the output shaft 410 continues to rotate counterclockwise, the second meshing structure 45 (the pin shaft and the shaft bushing) begins to mesh with the second protrusion 22 of the impact unit 20, as shown in state g. At the same time, the first meshing teeth 413 of the drive wheel 411 begin to disengage from the second meshing teeth 33 of the propulsion unit 30. As the output shaft 410 continues to rotate counterclockwise, the first meshing teeth 413 of the drive wheel 411 disengage from the second meshing teeth 33 of the propulsion unit 30, as shown in state h. At this point, the propulsion unit 30 is in the second position, and due to the action of the return unit 60, the propulsion unit 30 returns from the second position to the first position and finally returns to the starting position. The propulsion unit 30 adheres to the first buffer part 70 and returns to the initial position. At the same time, the impact unit 20 is in the second transition position, and the second interlocking structure 45 and the second protrusion 22 interlock with each other to drive the impact unit 20 from the second transition position to the energy storage position. The impact unit 20 moves the piston 12 and compresses the air spring. When the output shaft 410 further rotates counterclockwise, the second interlocking structure 45 and the second protrusion 22 interlock with each other to drive the impact unit 20 to the preload position, and then stops (state a).This completes the work cycle.

[0048] 15 , if a nail jam occurs for some reason and the fastener gets stuck in the fastener guide plate 52, the impact unit 20 may stop at any position along the first direction X (state j). Because the propulsion unit 30 and the impact unit 20 are not fixed, the propulsion unit 30 returns to its initial position by the action of the return unit 60 and fits tightly against the first buffer part 70, allowing the first meshing teeth 413 of the meshing area of ​​the drive wheel 411 to properly mesh with the second meshing teeth 33 of the propulsion unit 30. When the output shaft 410 further rotates counterclockwise, as shown in state k, the first meshing structure 44 cannot mesh with the first protrusion 23 due to the position at which the impact unit 20 is stopped. However, the first meshing teeth 413 of the meshing area of ​​the drive wheel 411 directly mesh with the second meshing teeth 33 of the propulsion unit 30, causing the propulsion unit 30 to move in the opposite direction of the first direction X. As the output shaft 410 continues to rotate counterclockwise, as shown in state l, the first meshing teeth 413 of the meshing region of the drive wheel 411 mesh with the second meshing teeth 33 of the propulsion unit 30, and the drive wheel 411 continues to move the propulsion unit 30 in the opposite direction of the first direction X. The propulsion unit 30 again meshes with the impact unit 20, and the propulsion unit 30 drives the impact unit 20, which moves the piston 12 in the opposite direction of the first direction X and compresses the air spring. As the output shaft 410 continues to rotate counterclockwise, as shown in state g, the second meshing structure 45 (the pin shaft and the shaft bushing) begins to mesh with the second protrusion 22 of the impact unit 20, and at the same time, the first meshing teeth 413 of the drive wheel 411 tries to disengage from the second meshing teeth 33 of the propulsion unit 30. As the output shaft 410 continues to rotate counterclockwise, as shown in state h, the first meshing teeth 413 of the meshing region of the drive wheel 411 disengage from the second meshing teeth 33 of the propulsion unit 30. At this point, the propulsion unit 30 is in the second position, and due to the action of the return unit 60, the propulsion unit 30 returns from the second position to the first position and finally to the initial position. The propulsion unit 30 comes into close contact with the first buffer section 70 and returns to the initial position.At the same time, the impact unit 20 is in the second transition position, and the second meshing structure 45 and the second protrusion 22 mesh with each other, driving the impact unit 20 from the second transition position to the energy storage position. The impact unit 20 moves the piston 12 and compresses the air spring. When the output shaft 410 further rotates counterclockwise, the second meshing structure 45 and the second protrusion 22 mesh with each other, driving the impact unit 20 to the preload position and then stopping (state a). This completes the work cycle.

[0049] 16 to 26 , a third embodiment of the present invention also provides a fastener driving tool, which includes an energy storage unit 10, an impact unit 20, a propulsion unit 30, a drive unit 40, a support unit 50, and a return unit 60. The support unit 50 supports the energy storage unit 10, the impact unit 20, the propulsion unit 30, and the drive unit 40. The return unit 60 has a first end and a second end arranged in opposite directions, the first end connected to the support unit 50, and the second end connected to the propulsion unit 30. The energy storage unit 10 is used to store impact energy. The impact unit 20 receives energy from the energy storage unit 10 and drives fasteners into a workpiece along a first direction X. The impact unit 20 has an initial position, a transition position, and an energy storage position arranged opposite to the first direction X. The propulsion unit 30 engages to move the impact unit 20 from the initial position to the transition position. The propulsion unit 30 has a first position corresponding to the initial position and a second position corresponding to the transition position. The drive unit 40 can be coupled to or disengaged from the propulsion unit 30, and the drive unit 40 has a coupled state and a disengaged state with the propulsion unit 30. The return unit 60 provides a return force for returning the propulsion unit 30 from the second position to the first position. When the propulsion unit 30 returns from the second position to the first position, the impact unit 20 disengages from the propulsion unit 30 at a transition position. The return unit 60 extends along the movement direction of the impact unit 20. When the propulsion unit 30 is in the second position, the return unit 60 is in an extended state.

[0050] The propulsion unit 30 includes a recess 31 provided on the opposite side of the fastening member, and the recess 31 opens in the opposite direction to the first direction X. The impact unit 20 includes a protrusion 21 that engages with the recess 31. When the propulsion unit 30 moves from the first position to the second position, the protrusion 21 is located within the recess 31, and the impact unit 20 is pushed in the opposite direction to the first direction X by the propulsion unit 30. When the propulsion unit 30 returns from the second position to the first position by the action of the return unit 60, the recess 31 and the protrusion 21 disengage.

[0051] The drive unit 40 includes a motor 43, an output shaft 410, a reduction mechanism 42, and a drive mechanism 41. The motor 43 supplies power to the drive mechanism 41. The drive mechanism 41 includes a drive wheel 411 and a crank 412 attached to the output shaft 410. The drive wheel 411 and the crank 412 are arranged on different planes in the axial direction of the output shaft 410. The crank 412 is coupled to or disengaged from the impact unit 20, and the crank 412 is in an engaged state and a disengaged state with the impact unit 20. The drive wheel 411 has an engaging region and a non-engaging region provided along its circumference, and the engaging region engages with the teeth of the propulsion unit 30 to form an engaged state. When the engaging region disengages from the propulsion unit 30, the crank 412 is coupled to the impact unit 20, and the crank 412 drives the impact unit 20 from the transition position to the energy storage position. When the impact unit 20 is disengaged from the crank 412, the impact unit 20 receives the impact energy released from the energy storage unit 10 and drives the fastener into the workpiece.

[0052] The propulsion unit 30 is disposed opposite the drive wheel 411 along the second direction Y. The second direction Y is perpendicular to the first direction X. The propulsion unit 30 has a meshing tooth region, and the return unit 60 is disposed on the opposite side of the meshing tooth region from the drive wheel 411 in the second direction. The return unit 60 and the impact unit 20 are disposed along the third direction Z, which is perpendicular to the first direction X and the second direction Y.

[0053] The fastener driving tool includes a first buffer part 70, and the propulsion unit 30 contacts the first buffer part 70 after returning due to the action of the return unit 60. Specifically, the support unit 50 includes the first buffer part 70 attached to the fastener guide plate, and when the propulsion unit 30 returns to its initial position due to the action of the return unit 60, the propulsion unit 30 contacts the first buffer part 70. The first buffer part 70 absorbs impact energy generated when the propulsion unit 30 returns and also absorbs impact that may be applied to the propulsion unit 30 from the impact unit 20. The first buffer part 70 also limits the travel distance of the propulsion unit 30 along the first direction X.

[0054] From state a to state h in FIG. 25, these states correspond to a normal work cycle.

[0055] State a, state b, state i, state j, state k, state l, state g, and state h in Figure 26 correspond to the work cycle when a nail jam occurs. If a fastening member is jammed in the fastening member guide plate, the impact unit 20 may stop at any position along the first direction X (state i). The above states a, b, state i, state j, state k, state i, state g, and state h correspond to the work cycle when a nail jam occurs.

[0056] 27 to 29, a fastener driving tool is also provided in a fourth embodiment of the present invention, and Fig. 27 shows a schematic diagram of a structure different from that of the third embodiment, and for other structures, please refer to Figs. 16 to 24. The fastener driving tool includes an energy storage unit 10, an impact unit 20, a propulsion unit 30, a drive unit 40, a support unit 50, and a return unit 60. The support unit 50 supports the energy storage unit 10, the impact unit 20, the propulsion unit 30, and the drive unit 40.

[0057] The energy storage unit 10 is used to store impact energy, and the impact unit 20 receives the energy from the energy storage unit 10 and drives a fastener into a workpiece along a first direction X. The impact unit 20 has an energy storage position and an initial position. The propulsion unit 30 drives the impact unit 20 from the initial position toward the energy storage position. The propulsion unit 30 has a first position corresponding to the initial position and a second position corresponding to the energy storage position. The drive unit 40 couples with or disengages from the propulsion unit 30, and the drive unit 40 has an coupled state and a disengaged state with the propulsion unit 30. The return unit 60 provides a return force to return the propulsion unit 30 from the second position to the first position. The propulsion unit 30 moves from the second position toward the first position through the cooperation of the energy storage unit 10 and the return unit 60. As the propulsion unit 30 moves from the second position toward the first position, the propulsion unit 30 disengages from the impact unit 20.

[0058] The drive unit 40 includes a motor 43, an output shaft 410, a reduction mechanism 42, and a drive mechanism 41, and the motor 43 supplies power to the drive mechanism 41. The drive mechanism 41 includes a drive wheel 411 attached to the output shaft 410. The drive wheel 411 has meshing regions and non-meshing regions arranged along its circumference, and the meshing regions mesh with the teeth of the propulsion unit 30 to form a meshed state.

[0059] In this embodiment, the drive mechanism 41 includes only a drive wheel 411 and does not include a crank. The impact unit 20 does not have a protrusion, and there is no meshing relationship between the impact unit 20 and the drive mechanism 41. When the output shaft 410 rotates the drive wheel 411, the drive wheel 411 drives the propulsion unit 30 from the initial position to the first position. The propulsion unit 30 can mesh with the impact unit 20 at the first position, so that the drive wheel 411 indirectly drives the impact unit 20 from the initial position to the energy storage position via the propulsion unit 30. The impact unit 20 drives the piston 12 in the direction opposite to the first direction X. After the impact unit 20 is driven to the energy storage position (i.e., after the piston 12 is driven to the top dead center), the drive wheel 411 disengages from the propulsion unit 30, the force of the energy storage unit 10 is released, and the impact unit 20 moves along the first direction X. As a result, the impact unit 20 moves from the energy storage position to the initial position, and at the same time, due to the cooperative action of the force of the energy storage unit 10 and the return force of the return unit 60, the propulsion unit 30 moves along the first direction X, from the second position towards the first position, and finally returns to the initial position. Because the propulsion unit 30 and the impact unit 20 are not fixedly connected, the propulsion unit 30 is separated from the impact unit 20 while the propulsion unit 30 moves from the second position to the first position and returns to the initial position. While the propulsion unit 30 moves from the second position to the first position, the propulsion unit 30 is separated from the impact unit 20.

[0060] The states a, b, c, d, e, and f shown in FIG. 28 correspond to a normal work cycle.

[0061] State a, state b, state c, state g, state h, state i, and state j shown in Figure 29 correspond to the work cycle when a nail jam occurs. If a fastening member is jammed in the fastening member guide plate, the impact unit 20 may stop at any position along the first direction X (state g). State a, state b, state c, state g, state h, state i, and state j correspond to the work cycle when a nail jam occurs.

[0062] At this point, the driving unit 40 indirectly engages with the impact unit 20 via the propulsion unit 30. The propulsion unit 30 can independently return to its initial position through the action of the return unit 60, so that even if the impact unit 20 stops in an abnormal position due to nail jamming, the driving unit 40 always properly engages with the propulsion unit 30 and drives the propulsion unit 30 to the abnormal position where the impact unit 20 has stopped, thereby allowing the propulsion unit 30 and the impact unit 20 to properly engage again.

[0063] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any way. Although the present invention has been disclosed with reference to a preferred embodiment, the present invention is not limited thereto. A person skilled in the art can make slight changes or modifications using the above disclosure to create an embodiment with equivalent modifications without departing from the technical scope of the present invention. The content that does not depart from the technical scope of the present invention includes simple changes, equivalent changes, and modifications made to the above embodiment based on the technical essence of the present invention. [Explanation of symbols]

[0064] 10 Energy storage unit 20 Impact Unit 30 Propulsion Unit 40 Drive Unit 50 Support Unit 60 Return Unit 70 1st buffer section 80 Second buffer section 90 First Hook 11 cylinders 12 pistons 13 Seal ring 21 Convexity 22 Second protrusion 23 1st protrusion 31 Concave tank 32 Second Hook 33 Second mating tooth 41 Drive mechanism 42 Reduction mechanism 43 Motor 44 First interlocking structure 45 Second interlocking structure 410 output shaft 411 Drive wheels 412 Crank 413 First mating tooth 51 Base 52 Fastening member guide plate 53 Fastening member storage clip 54 Guide rail X 1st direction Y Second direction Z 3rd direction

Claims

1. The energy storage unit is for storing impact energy, the impact unit receives energy from the energy storage unit and drives the fastening member into the workpiece along a first direction; the impact unit has an initial position, a first transition position, a second transition position, and an energy storage position, all of which are arranged in a direction opposite to the first direction; a propulsion unit for driving the impact unit; the propulsion unit has a first position corresponding to the first transition position and a second position corresponding to the second transition position; a drive unit for supplying power to the propulsion unit and the impact unit; a return unit providing a return force for returning the propulsion unit from the second position to the first position; In the initial position, the impact unit and the propulsion unit are not engaged with each other, In the first transition position, the impact unit and the propulsion unit are engaged with each other; In the second transition position, the impact unit and the propulsion unit are disengaged from each other, When the impact unit is in the initial position, the drive unit engages with the impact unit and drives the impact unit, and after the impact unit moves a predetermined distance, the drive unit engages with the propulsion unit and drives the propulsion unit, and the propulsion unit engages with the impact unit at the first position and moves the impact unit from the first transition position to the second transition position.

2. The fastener driving tool of claim 1 , wherein after the impact unit reaches the second transition position, the drive unit moves the impact unit from the second transition position to the energy storage position.

3. The fastener driving tool further includes a support unit, the support unit supports the energy storage unit, the impact unit, the propulsion unit, and the drive unit; The return unit has a first end and a second end disposed in opposite directions; the first end is connected to the support unit; The fastener driving tool of claim 1 , wherein the second end is connected to the propulsion unit.

4. the drive unit includes a motor and a drive mechanism; the motor powers the drive mechanism; the drive mechanism includes a drive wheel; The drive wheel has meshing regions and non-meshing regions provided along its circumference, The fastener driving tool of claim 1 , wherein the engagement region engages with teeth of the propelling unit to form an engagement state.

5. The impact unit includes a first protrusion and a second protrusion, the drive mechanism includes a first meshing structure and a second meshing structure; the first engagement structure engages with the first protrusion to move the impact unit from the initial position to the first transition position; the second engagement structure engages with the second protrusion to move the impact unit from the second transition position to the energy storage position; 5. The fastener driving tool according to claim 4, wherein when the second protrusion is disengaged from the second engagement structure, the impact unit drives the fastener into the workpiece under the action of impact energy released from the energy storage unit.

6. the drive unit includes a drive mechanism; the drive mechanism includes a drive wheel; the propulsion unit is disposed opposite the drive wheel along a second direction, the propulsion unit includes a meshing tooth region; The return unit is disposed on an opposite side of the meshing tooth region from the drive wheel in the second direction, The fastener driving tool of claim 1 , wherein the second direction is perpendicular to the first direction.

7. The return unit is disposed along a third direction with the impact unit, The fastener driving tool of claim 6 , wherein the third direction is perpendicular to the first direction and the second direction.

8. The propulsion unit includes a recessed basin; The recessed basin is open in a direction opposite to the first direction, The impact unit includes a protrusion that engages with the recess; 2. The fastener driving tool according to claim 1, wherein, during the process of moving the propulsion unit from the first position to the second position, the protrusion is within the recess, and the impact unit is pushed in a direction opposite to the first direction by the propulsion unit.

9. The fastening member driving tool further includes a buffer unit, The fastener driving tool according to claim 1 , wherein the propelling unit is brought into contact with the buffer portion after being acted upon by the return unit to return.

10. The energy storage unit is for storing impact energy, the impact unit receives energy from the energy storage unit and drives the fastening member into the workpiece along a first direction; the impact unit has an initial position, a first transition position, a second transition position, and an energy storage position, all of which are arranged in a direction opposite to the first direction; a propulsion unit for driving the impact unit; the propulsion unit has a first position corresponding to the first transition position and a second position corresponding to the second transition position; a drive unit for supplying power to the propulsion unit and the impact unit; a return unit providing a return force for returning the propulsion unit from the second position to the first position; In the initial position, the impact unit and the propulsion unit are not engaged with each other, In the first transition position, the impact unit and the propulsion unit are engaged with each other; In the second transition position, the impact unit and the propulsion unit are disengaged from each other, When the impact unit is in the initial position, the drive unit simultaneously drives the impact unit and the propulsion unit, and the propulsion unit engages with the impact unit at the first position to move the impact unit from the first transition position to the second transition position.

11. After the impact unit reaches the second transition position, the drive unit moves the impact unit from the second transition position to an energy storage position; the drive unit includes a motor and a drive mechanism; the motor powers the drive mechanism; the drive mechanism includes a drive wheel; The drive wheel has meshing regions and non-meshing regions provided along its circumference, the meshing region meshes with the teeth of the propulsion unit to form the meshed state; The impact unit includes a first protrusion and a second protrusion, the drive mechanism includes a first meshing structure and a second meshing structure; the first engagement structure engages with the first protrusion to move the impact unit from the initial position to the first transition position; The fastener driving tool of claim 10 , wherein the second engagement structure engages the second protrusion to move the impacting unit from the second transition position to the energy-storing position.

12. The propulsion unit includes a recessed basin; The recessed basin is open in a direction opposite to the first direction, The impact unit includes a protrusion that engages with the recess; 11. The fastener driving tool according to claim 10, wherein, during the process of the propulsion unit moving from the first position to the second position, the protrusion is within the recess, and the impact unit is pushed in a direction opposite to the first direction by the propulsion unit.

13. The energy storage unit is for storing impact energy, The impact unit receives energy from the energy storage unit and drives the fastener into the workpiece along a first direction, and the impact unit has an initial position, a transition position, and an energy storage position, which are arranged in a direction opposite to the first direction; a propulsion unit that engages the impact unit to move the impact unit from the initial position to the transition position, the propulsion unit having a first position corresponding to the initial position and a second position corresponding to the transition position; a drive unit for supplying power to the propulsion unit and the impact unit; a return unit providing a return force for returning the propulsion unit from the second position to the first position; When the impact unit is in the transition position, the propulsion unit is in the second position, and the return unit separates the propulsion unit from the impact unit at the second position.

14. The propulsion unit includes a recessed basin; The recessed basin is open in a direction opposite to the first direction, The impact unit includes a protrusion that engages with the recess; During the process of the propulsion unit moving from the first position to the second position, the protrusion is within the recess, and the impact unit is pushed in a direction opposite to the first direction by the propulsion unit; 14. The fastener driving tool of claim 13, wherein when the impact unit is in the second transition position, the propelling unit is in the second position, and the recess and the protrusion are disengaged by the action of the return unit.

15. the drive unit includes a motor and a drive mechanism; the motor powers the drive mechanism; the drive mechanism includes a drive wheel; The drive wheel has meshing regions and non-meshing regions provided along its circumference, the meshing region meshes with the teeth of the propulsion unit to form the meshed state; the drive mechanism further includes a crank; The crank is coupled to or disengaged from the impact unit; When the impact unit is disengaged from the crank, the impact unit receives the impact energy released by the energy storage unit and drives the fastening member into the workpiece; the propulsion unit is disposed opposite the drive wheel along a second direction, the propulsion unit includes the meshing tooth region; The return unit is disposed on an opposite side of the meshing tooth region from the drive wheel in the second direction, the second direction is perpendicular to the first direction, The return unit is disposed along a third direction with the impact unit, The fastener driving tool of claim 13 , wherein the third direction is perpendicular to the first direction and the second direction.

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