Driving tool

Abstract

The present invention provides a driving tool. The driving tool drives a driven member into a workpiece by moving a driver with gas pressure, and moves the driver from a lower end to an upper end position by engaging a wheel portion of a lifting mechanism with the driver. However, the relative position of the wheel portion with respect to the driver can be shifted due to a nail being stuck or the like. In this case, a structure in which a part of the engaging portion is retracted due to interference with the engaged portion of the driver when starting the lifting operation can impair durability. The driving tool of the present invention has a displacement permitting mechanism that permits the wheel portion to be displaced in a radial direction with respect to a rotation axis, and a displacement restricting mechanism that restricts displacement of the wheel portion in the radial direction. In an initial stage of the lifting operation, i.e., a stage in which the first engaging portion is engaged with the engaged portion by rotation of the wheel portion, the displacement restricting mechanism is released from the state of restricting displacement of the wheel portion, and the wheel portion as a whole is allowed to be displaced in the radial direction. Accordingly, durability can be ensured and interference can be avoided to return to a normal engaged state.

Description

Technical Field

[0001] This invention relates to a driving tool for driving nails, staples, and other inserters into wood or other materials. Background Technology

[0002] Patent documents 1 and 2 disclose a pneumatic spring-loaded driving tool that uses the thrust of compressed gas as the striking force. The pneumatic spring-loaded driving tool has a piston and a driver, wherein the piston moves up and down within a cylinder; the driver, integrated with the piston, moves downward to strike the driving element. The piston and driver move downward in the driving direction under the gas pressure in the accumulator chamber. The piston and driver return in the opposite direction to the driving direction via a lifting mechanism.

[0003] The lifting mechanism has a wheel with multiple engaging parts that engage with engaging parts on the actuator. The wheel rotates via an electric motor. After the driving action, the wheel rotates, causing the engaging parts to sequentially engage with the engaging parts on the actuator, thus moving the actuator upwards in the opposite direction to the driving direction. By moving the piston upwards in the opposite direction to the driving direction, the gas pressure in the accumulator chamber is increased. By disengaging the lifting mechanism from the actuator, which has moved to its upper position, the actuator moves downwards under the pressure of the gas to perform the striking action.

[0004] Patent Document 1 discloses a technique for suppressing loads on the engaging portion of an inserter or the engaging portion of a lifting mechanism. According to the technique in Patent Document 1, the load is suppressed by displacing the engaging portion (end pin) of the lifting mechanism, which engages with the engaging portion of the inserter at the upper moving end position, in the opposite direction to the engaging direction. Patent Document 2 discloses a technique for dealing with situations where, for example, the relative position of the engaging portion of the lifting mechanism relative to the engaging portion of the inserter shifts due to a nail getting stuck. According to the technique in Patent Document 2, interference between the engaging portion and the engaging portion of the inserter can be avoided by displacing the engaging portion (first pin) that engages first at the start of the inserter's lift in the opposite direction to the engaging direction.

[0005] [Existing technical documents]

[0006] [Patent Literature]

[0007] Patent Document 1: International Publication No. 2020 / 059666

[0008] Patent Document 2: International Publication No. 2016 / 199670 Summary of the Invention

[0009] [The technical problem the invention aims to solve]

[0010] Patent documents 1 and 2 disclose a structure that allows a portion of the engagement parts (end pin, first pin) of a lifting mechanism to always be displaceable. According to this structure, the delicate parts of the lifting mechanism become structurally complex, compromising its durability and potentially causing malfunctions. The object of this invention is to ensure good operation of the lifting mechanism without compromising its durability.

[0011] [Technical solutions used to solve technical problems]

[0012] According to one embodiment of the present invention, a driving tool includes a piston and a driver, wherein the piston moves in the driving direction, for example, by gas pressure, and the driver moves integrally with the piston in the driving direction to strike the driving element. Additionally, the driving tool includes, for example, a lifting mechanism that moves the driver in the opposite direction to the driving direction. The driver has, for example, multiple engaging portions along its long side. The lifting mechanism has, for example, a rotating shaft and a wheel that rotates with the rotating shaft. The lifting mechanism also has, for example, multiple engaging portions arranged along the outer periphery of the wheel and engaging with the engaging portions of the driver. The lifting mechanism also has, for example, a displacement allowing mechanism that allows the wheel to move radially relative to the rotating shaft. The lifting mechanism also has, for example, a displacement limiting mechanism that limits the radial displacement of the wheel. The multiple engaging parts include a first engaging part and a second engaging part. The first engaging part is the first engaging part to engage with the engaged part when the lifting mechanism moves the inserter in the opposite direction to the inserting direction. The second engaging part is the second engaging part to engage with the engaged part. During the engagement phase between the first engaging part and the engaged part, the displacement limiting mechanism releases the displacement limiting state of the wheel.

[0013] Therefore, by displacing the wheel radially, interference between the first engaging part and the engaged part of the driver (a state where it does not engage with the lower surface of the engaged part) is avoided. Accordingly, even if the driver stops in the driving direction at a position not yet reaching the lower moving end due to, for example, a nail jamming, resulting in interference where the first engaging part of the wheel does not engage with the lower surface of the engaged part, interference can be avoided by displacing the wheel radially, and the engaging part engages with the lower surface of the engaged part. By rotating the wheel in the engaged state, the driver moves upward.

[0014] The wheel section is displaced radially as a whole, thereby moving the engaging part away from the engaged part. This avoids structural complexity in terms of details compared to a structure that only displaces a portion of the engaging part. Furthermore, for example, when the first engaging part experiences a reaction force in the opposite direction to the engaging direction from the engaged part of the inserter due to the aforementioned interference, the displacement-allowing mechanism allows the wheel section to displace radially. By displacing the wheel section radially, the excessive reaction force caused by the interference is absorbed, thereby restoring the normal engaging state between the first engaging part and the engaged part. Conversely, by limiting the radial displacement of the wheel section by the displacement-limiting mechanism, malfunctions can be more reliably avoided compared to a structure that always allows displacement of each engaging part. Attached Figure Description

[0015] Figure 1 This is an overall side view of the tool.

[0016] Figure 2 yes Figure 1 Section II-II view.

[0017] Figure 3 This is a perspective view of the lifting mechanism and displacement-allowing mechanism involved in the first embodiment.

[0018] Figure 4 This is a longitudinal sectional view of the lifting mechanism and displacement-allowing mechanism according to the first embodiment. This figure shows the displacement-allowing state of the engagement part allowing radial displacement.

[0019] Figure 5 This is a longitudinal sectional view of the lifting mechanism and displacement allowing mechanism according to the first embodiment. This figure shows the displacement limiting state of the locking part in the radial direction.

[0020] Figure 6 yes Figure 4 The VI-VI section view is a top view of the rotating cam.

[0021] Figure 7 This is a diagram of the unfolded cam mechanism. The diagram shows the state after the rotating cam's cam tip engages with the cam recess of the fixed cam, causing the rotating cam to rise.

[0022] Figure 8 This is a diagram of the unfolded cam mechanism. The diagram shows the state after the fixed cam disengages from the cam recess and the rotating cam moves downwards.

[0023] Figure 9 This is a longitudinal sectional view of the main body. This figure shows the standby state.

[0024] Figure 10 This is a longitudinal sectional view of the main body. This figure shows the inserter in the position of the upper moving end.

[0025] Figure 11 This is a longitudinal sectional view of the main body. This figure shows the inserter in the lower moving end position.

[0026] Figure 12 This is a longitudinal sectional view of the main body. This figure shows the inserter in a locked state, stopped before reaching the locking position of the lower moving end.

[0027] Figure 13 yes Figure 12 A magnified view of a portion of the image. This image shows the engagement state of the engaging and locked parts in the locked state of the inserter. This image also shows the interference state between the first engaging part and the third locked part.

[0028] Figure 14 This figure shows the engagement state of the engaging part and the engaged part when the inserter is in the locked state. This figure shows the state after the wheel part is radially displaced by applying a specified or greater external force from the third engaged part to the first engaging part.

[0029] Figure 15 This diagram shows the engagement state of the engaging and locked parts of the inserter in the locked state. This figure shows the engagement state of the first engaging part and the second locked part.

[0030] Figure 16 This is a longitudinal sectional view of the main body. This figure shows the displacement restriction state of the locking component entering the through hole.

[0031] Figure 17 This is a perspective view of the lifting mechanism involved in the second embodiment.

[0032] Figure 18 This is an exploded perspective view of the lifting mechanism involved in the second embodiment.

[0033] Figure 19 This is a cross-sectional view of the lifting mechanism according to the second embodiment. This figure shows the locking state where the inserter is stopped at the locking position before reaching the lower moving end.

[0034] Figure 20 This is a cross-sectional view of the lifting mechanism according to the second embodiment. This figure shows the state after the wheel has been displaced radially.

[0035] Figure 21 yes Figure 20 The section view from XXI to XXI is a longitudinal section view of the lifting mechanism.

[0036] Figure 22 yes Figure 21 Section XXII-XXII is a cross-sectional view of the lifting mechanism. This figure shows the state in which radial displacement of the wheel is permitted.

[0037] Figure 23yes Figure 21 Section XXIII-XXIII is a cross-sectional view of the lifting mechanism. This figure shows the state in which the limiting component has detached from the limiting wall and reached the limiting release section.

[0038] Figure 24 This is a cross-sectional view of the lifting mechanism according to the second embodiment. This figure shows the state in which the first engaging part and the second engaged part are engaged.

[0039] Figure 25 This is a cross-sectional view of the lifting mechanism according to the second embodiment. This figure shows the state in which the wheel portion is restricted to radial displacement.

[0040] Figure 26 This is a cross-sectional view of the lifting mechanism according to the second embodiment. This figure shows the state in which the limiting member moves along the limiting wall.

[0041] [Explanation of reference numerals in the attached figures]

[0042] 1: Insertion tool; N: Insertion component; 2: Insertion head; 2a: Insertion channel; 2b: Injection outlet; 3: Handle; 3a: Switch operating handle; 4: Battery mounting part; 5: Battery pack; 6: Nail box; 10: Main body; 11: Main body housing; 12: Cylinder; 13: Piston; 14: Accumulator; 15: Insertor; L: Engaged part; L1: First engaged part; L2: Second engaged part; L3: Third engaged part; L4: Fourth engaged part; L5: Fifth engaged part; L6: Sixth engaged part; L7: Seventh engaged part; L8: Eighth engaged part; L9: Ninth engaged part; L10: End engaged part; 16: Lower moving end shock absorber; 20: Lifting mechanism (first embodiment); 2 1: Rotating shaft (first embodiment); 21a: Support plane; 21b: Support surface; 22: Wheel (first embodiment); 22a: Flange; P: Engaging part; P1: First engaging part; P2: Second engaging part; P3: Third engaging part; P4: Fourth engaging part; P5: Fifth engaging part; P6: Sixth engaging part; P7: Seventh engaging part; P8: Eighth engaging part; P9: Ninth engaging part; P10: End engaging part; F: External force in the sliding direction borne by the engaging part P of wheels 22 and 52; 23, 24: Bearings; 25: Mechanism housing; 25a: Cover; 25b: Window; 26: Clearance part; 27: Displacement allowing mechanism (first embodiment); 28: Through hole; 28a: Sliding surface; 2 9: Compression spring; 30: Drive unit; 31: Drive unit housing; 32: Electric motor; 32a: Output shaft; 32b: Motor housing; 32c, 32d: Bearings; J: Motor shaft; 33: Reduction gear set; 40: Displacement limiting mechanism (first embodiment); 41: Locking component; 42: Cam mechanism; 43: Rotary cam; C1, C2, C3: Cam portion; 43a: Support hole; 43b: Bearing surface; 43c: Top of first cam; 43d: Top of second cam; 43e: Top of third cam; 43f, 43g, 43h: Lift portion; 44: Fixed cam; 44a: Valley of first cam; 44b: Valley of second cam; 44c: Valley of third cam; 44d, 44e, 44f : Cam top; 45: Compression spring; 50: Lifting mechanism (second embodiment); 51: Rotating shaft (second embodiment); 51a: Support plane; 52: Wheel (second embodiment); 52a: Flange; 60: Displacement allowing mechanism (second embodiment); 61: Through hole; 61a: Sliding surface; 61b: Clearance; 62: Compression spring; 70: Displacement limiting mechanism (second embodiment); 71: Limiting circular plate (upper side); 71a: Through hole; 71b: Limiting wall; 71c: Limit release part; 72: Limiting circular plate (lower side); 72a: Through hole; 72b: Limiting wall; 72c: Limit release part; 72d: Notch; 73: Limiting component (upper side); 74: Limiting component (lower side). Detailed Implementation

[0043] In one or more embodiments, for example, during the stage when the second engaging part engages with the engaged part, the radial displacement of the wheel is limited by a displacement limiting mechanism.

[0044] Therefore, at the point when the second engaging part engages with the engaged part of the inserter, the radial displacement of the wheel is restricted by the displacement limiting mechanism. Thus, radial displacement of the wheel is only permitted when the first engaging part engages with the engaged part of the inserter. Only for the first engaging part, where an abnormal engagement between the engaging part and the engaged part of the inserter is anticipated, is radial displacement of the wheel allowed to retract in the direction opposite to the engaging direction. During the engagement phases of engaging parts other than the first engaging part, radial displacement of the wheel is restricted, thereby reliably preventing malfunctions.

[0045] In one or more embodiments, the following structure may be adopted: at the latest, at the stage when the displacement direction of the wheel relative to the rotation axis becomes parallel to the movement direction of the driver, the radial displacement of the wheel is restricted.

[0046] Therefore, at the stage where the direction of the force applied by the inserter (the direction of inserter movement) is aligned with the direction of wheel displacement relative to the rotation axis, the engaging part is subjected to a large external force (a thrust generated by gas pressure) from the inserter in the direction of wheel displacement. At the latest at this stage, the displacement of the wheel is limited by a displacement limiting mechanism. Accordingly, the engaging state of the lifting mechanism relative to the inserter is well maintained, thus preventing malfunctions. At the stage where the direction of wheel displacement is inclined relative to the direction of inserter movement, the external force applied by the inserter to the wheel in the direction of wheel displacement decreases. During the rotation of the wheel, at the latest at the stage where the direction of wheel displacement becomes parallel to the direction of inserter movement, radial displacement of the wheel is limited, thereby maintaining a good engaging state while withstanding a large external force.

[0047] In one or more embodiments, for example, the displacement-allowing mechanism has a through-hole formed in the wheel portion. The through-hole can, for example, be formed in a radially elongated shape to allow radial displacement of the wheel portion relative to a rotating shaft inserted into the through-hole. The displacement-limiting mechanism, for example, has a locking member that limits the radial displacement of the wheel portion by engaging with the through-hole.

[0048] Therefore, the locking component enters between the through hole of the wheel and the rotating shaft supporting the wheel, thereby restricting the radial displacement of the wheel relative to the rotating shaft. When the locking component retracts from the through hole, radial displacement of the wheel relative to the rotating shaft is permitted. By moving the locking component forward and backward relative to the through hole, the state of allowing radial displacement of the wheel and the state of restricting radial displacement of the wheel are switched.

[0049] In one or more embodiments, the locking member is displaced, for example, along the axial direction of the rotation axis, to move forward and backward relative to the through hole. Therefore, the forward and backward movement of the locking member relative to the through hole can be performed with a simple structure.

[0050] In one or more embodiments, the locking member is located, for example, on the inner circumferential side of the engaging portion. Therefore, a more compact displacement limiting mechanism can be achieved.

[0051] In one or more embodiments, for example, a cam mechanism is provided that causes the locking member to move forward and backward relative to the through hole as the wheel rotates. Therefore, the locking member enters the through hole in conjunction with the rotation of the wheel. Conversely, the locking member exits the through hole in conjunction with the rotation of the wheel.

[0052] In one or more embodiments, for example, the wall surface of the through hole has a pair of parallel sliding surfaces extending radially. The rotating shaft has a pair of support planes facing the pair of sliding surfaces and extending radially. Through the sliding contact between the sliding surfaces of the through hole and the support planes of the rotating shaft, the power of the rotating shaft is transmitted to the wheel, causing the wheel to rotate integrally with the rotating shaft, and the wheel is supported on the rotating shaft in a manner that allows it to be displaced radially relative to the rotating shaft.

[0053] In one or more embodiments, for example, a force-applying member is installed within the insertion hole. The force-applying member applies force, for example, to the wheel portion in a direction that engages with the engaging portion of the inserter. Therefore, the engaging state of the engaging portion and the engaged portion is maintained by the force-applying member. By installing the force-applying member within the insertion hole, the displacement-allowing mechanism can be made more compact.

[0054] In one or more embodiments, the displacement limiting mechanism has a force-applying component that applies force, for example, to the locking component in a direction that causes the locking component to retract from the through hole. Therefore, the locking component can be reliably retracted from the through hole with a simple structure.

[0055] In one or more embodiments, for example, the cam mechanism has multiple cam portions, which are non-equally spaced around the axis of the rotation shaft. All of the multiple cam portions engage with the cam receiving side at one location around the axis of the rotation shaft. Accordingly, the forward and backward movement of the locking member relative to the through hole is fixed at one location around the axis of the rotation shaft. Therefore, a state allowing radial displacement of the wheel portion and a state restricting radial displacement of the wheel portion can be reliably achieved at this fixed location around the axis of the rotation shaft. This maintains a good engagement state between the lifting mechanism and the inserter.

[0056] In one or more embodiments, for example, the displacement allowing mechanism has a through hole formed in the wheel portion. The through hole, for example, has a radially elongated shape to allow radial displacement of the wheel portion relative to a rotating shaft inserted into the through hole. For example, the displacement limiting mechanism has: a limiting member disposed on the wheel portion; a limiting wall portion disposed around the wheel portion for limiting radial displacement of the limiting member; and a limiting release portion for releasing the limiting state based on the limiting wall portion.

[0057] Therefore, the limiting wall restricts the radial displacement of the limiting member, thereby limiting the radial displacement of the wheel relative to the axis of rotation. When the limiting member disengages from the limiting wall, the wheel is allowed to move radially relative to the axis of rotation. The state of allowing radial displacement of the wheel and the state of limiting radial displacement of the wheel are switched depending on whether there is a limiting wall that restricts the radial displacement of the limiting member.

[0058] In one or more embodiments, for example, the limiting members protrude from two surfaces of the wheel portion in the axial direction. Therefore, the limiting members are guided by the limiting walls on both sides of the wheel portion in the axial direction. This ensures stable rotation of the wheel portion and clearly switches between a state allowing radial displacement of the wheel portion and a state restricting radial displacement.

[0059] In one or more embodiments, for example, both ends of the engaging portion protrude towards two surfaces in the axial direction of the wheel portion, and a limiting member is provided using the protruding portions of the engaging portion. Therefore, by using the engaging portion to provide a limiting member, the structure can be simplified.

[0060] In one or more embodiments, for example, the limiting member is positioned relative to the rotation axis on the side facing the first engaging portion. Therefore, the displacement direction of the wheel is set such that the first engaging portion moves away from the engaged portion of the inserter. Accordingly, during the engagement phase between the first engaging portion and the engaged portion, the wheel becomes capable of radial displacement, thereby preventing interference between the first engaging portion and the engaged portion.

[0061] In one or more embodiments, a roller capable of rotating freely about an axis is provided on the limiting member. Therefore, by ensuring that the limiting member moves smoothly along the limiting wall, smooth rotation of the wheel can be ensured.

[0062] [Example]

[0063] Figure 1As an example of a driving tool 1, a gas spring type driving tool is shown that uses the gas pressure in the upper chamber of a cylinder as the thrust for driving in a driving member N. In the following description, as shown in the figures, the driving direction of the driving member N is defined as downward, and the direction opposite to the driving direction is defined as upward. The driving device 15 described below moves downward to drive in the driving member N, and after driving in the driving member N, the driving device 15 returns to upward. The user of driving tool 1... Figure 1 The center is roughly located to the left of tool 1. The side closest to the user is designated as the rear (user side), and the front is designated as the front side. Furthermore, the left and right directions are defined based on the user.

[0064] like Figure 1 , 2 As shown in Figure 9, the driving tool 1 has a main body 10. The main body 10 has a structure in which a cylinder 12 is installed within a generally cylindrical main body housing 11. A piston 13 is housed within the cylinder 12 in a manner that allows it to reciprocate up and down. The upper part of the cylinder 12 communicates with a pressure accumulator 14. The gas pressure in the pressure accumulator 14 functions as a thrust for striking the upper surface of the piston 13.

[0065] An elongated inserter 15 is attached to the lower surface of the piston 13. The inserter 15 extends downward. The lower part of the inserter 15 enters the insertion channel 2a of the inserter head 2, which is located on the lower surface of the main body 10. By the gas pressure acting on the accumulator chamber 14 on the upper surface of the piston 13, the inserter 15 moves downward in the insertion channel 2a, thereby striking an insert N. The struck insert N is ejected from the ejection port 2b of the inserter head 2. The ejected insert N is driven into the insert W. A lower moving end damper 16 is disposed at the lower part of the cylinder 12 to absorb the impact of the lower moving end of the piston 13.

[0066] A handle 3 for the user to grip is provided on the side of the main body 10. A switch operating handle 3a for the user to operate by pressing with their fingertips is provided on the lower surface of the front side of the handle 3. A battery mounting part 4 is provided at the rear of the handle 3. A battery pack 5 is installed in the battery mounting part 4. The drive unit 30, described later, operates using the electrical power of the battery pack 5 as its power source.

[0067] The nail cartridge 6 is combined with the driving head 2. Multiple driving parts N loaded in the nail cartridge 6 are fed one by one into the driving channel 2a.

[0068] A lifting mechanism 20 is integrated into the side of the injection head 2. The lifting mechanism 20 has the function of returning the piston 13 and the injection device 15 upward as a single unit after impact. By returning the piston 13 upward by the lifting mechanism 20, the gas pressure in the accumulator chamber 14 can be increased.

[0069] A drive unit 30 is arranged side-by-side on the lifting mechanism 20. The drive unit 30 actuates the lifting mechanism 20. The drive unit 30 is housed in a drive unit housing 31, which spans in a generally L-shape between the lower part of the lifting mechanism 20 and the battery mounting part 4. The drive unit housing 31 is integrally formed with the main body housing 11. The lifting mechanism 20 is also covered by the drive unit housing 31.

[0070] The drive unit 30 includes an electric motor 32 as a drive source. The electric motor 32 has its output shaft 32a axis (motor axis J) aligned with the input direction ( Figure 2 The direction orthogonal to the paper (orthogonal to the front and back direction) is housed. The electric motor 32 is started by the power of the battery pack 5. As described above, the electric motor 32 is started by pulling the switch operating lever 3a.

[0071] The output shaft 32a of the electric motor 32 is rotatably supported on the motor housing 32b via bearings 32c and 32d. The output shaft 32a is connected to a reduction gear set 33. A cylindrical mechanism housing 25 is attached to the front of the motor housing 32b. The reduction gear set 33 is supported on the inner circumference of the mechanism housing 25. The reduction gear set 33 uses three sets of planetary gears. The three sets of planetary gears are coaxial with each other and arranged coaxially with the motor axis J. The rotational output of the electric motor 32 is reduced in speed by the reduction gear set 33, which includes the three sets of planetary gears, and then output to the lifting mechanism 20.

[0072] The lifting mechanism 20 has a rotating shaft 21 connected to the reduction gear set 33 and a wheel portion 22 supported by the rotating shaft 21. The rotating shaft 21 is rotatably supported on the inner circumference of the mechanism housing 25 by front and rear bearings 23 and 24. The axis of rotation of the rotating shaft 21 is aligned with the motor axis J. A displacement limiting mechanism 40 is connected to the front of the lifting mechanism 20. In front of the displacement limiting mechanism 40, the front part of the mechanism housing 25 is sealed by a cover portion 25a. The front bearing 23 is held on the mechanism housing 25 by the cover portion 25a. The rear bearing 24 is held at the bottom of the mechanism housing 25.

[0073] When the electric motor 32 starts, the wheel 22 of the lifting mechanism 20 rotates together with the electric motor 32. For example... Figure 2 , 3 As shown in Figures 4 and 5, the wheel portion 22 has two parallel flange portions 22a spaced apart by a certain interval. A plurality of engaging portions P span between the peripheral edges of the two flange portions 22a and are provided in a supported state at both ends. In this embodiment, as... Figure 9 As shown, for example, there are 10 engaging parts P (P1 to P10). Each engaging part P uses a cylindrical shaft component (pin).

[0074] Multiple engaging portions P are provided within a certain range in the circumferential direction of the wheel portion 22. In this embodiment, 10 engaging portions P are arranged at equal intervals within approximately 3 / 4 of the circumference. No engaging portions P are provided in the remaining circumferential range. Hereinafter, the circumferential range where no engaging portions P are provided will be referred to as the clearance portion 26. The left side of the wheel portion 22 enters the insertion channel 2a through the window portion 25b provided in the mechanism housing 25. Within the insertion channel 2a, each engaging portion P of the wheel portion 22 engages with the engaging portion L of the inserter 15.

[0075] A plurality of engaging portions L are provided on the right side of the inserter 15. In this embodiment, the 10 engaging portions L are arranged at certain intervals along the length (vertical direction) of the inserter 15. Each engaging portion L is rack-tooth shaped and is configured to extend laterally. By rotating the wheel 22 with each engaging portion P of the wheel 22 engaged with the engaging portions L of the inserter 15, the inserter 15 and the piston 13 return upward. By starting the electric motor 32, the wheel 22... Figure 9 , 10 Rotate counterclockwise as shown by the arrow in 11.

[0076] Figure 9 This indicates the standby state of the main body 10. In the standby state, the inserter 15 and piston 13 are held in a position slightly below the upper moving end. In this standby state, the engaging portion P, which is immediately adjacent to the avoidance portion 26 before it, engages with the lower surface of the engaging portion L at the lowermost end of the inserter 15. Hereinafter, the engaging portion P, which is immediately adjacent to the avoidance portion 26 before it, will be specifically referred to as the end engaging portion P10. The engaging portion L at the lowermost end of the inserter 15 will be specifically referred to as the end engaging portion L10.

[0077] In standby mode, the electric motor 32 is started by pulling the switch lever 3a. When the starting of the electric motor 32 causes the wheel 22 to rotate counterclockwise, the piston 13 and the inserter 15 move further upward from the standby position due to the engagement of the end engaging part P10 and the end engaged part L10. Accordingly, Figure 10 As shown, piston 13 and injector 15 are in the injecting state, about to reach the upper moving end.

[0078] In the pre-insertion state, the end engaging portion P10 is about to disengage from the end engaged portion L10. As the wheel 22 continues to rotate counter-clockwise, the end engaging portion P10 disengages from the end engaged portion L10. Accordingly, the piston 13 and the inserter 15 move downwards under the gas pressure of the accumulator chamber 14. The inserter 15 moves downwards within the insertion channel 2a, thereby striking an inserting element N. During the downward movement of the inserter 15, the engaging portion P of the wheel 22 completely exits from the insertion channel 2a and is located within the mechanism housing 25. Therefore, the clearance portion 26 of the wheel 22 is located within the insertion channel 2a. This prevents interference between the engaging portion P and the engaged portion L of the inserter 15, thus ensuring smooth insertion.

[0079] After striking the insert N, with the inserter 15 at its lower moving end, the wheel 22 continues to rotate counterclockwise. Accordingly, as... Figure 11 As shown, in the rotational direction of the wheel 22, the engaging portion P immediately following and adjacent to the clearance portion 26 engages with the lower surface of the uppermost engaging portion L of the inserter 15. Hereinafter, the engaging portion P immediately following and adjacent to the clearance portion 26 will be specifically referred to as the first engaging portion P1. The uppermost engaging portion L of the inserter 15 will be specifically referred to as the first engaging portion L1.

[0080] With the first engaging part P1 engaged with the first engaged part L1, the wheel 22 continues to rotate counterclockwise. Subsequently, the second engaging part P2 engages with the lower surface of the second engaged part L2, and then the third engaging part P3 engages with the lower surface of the third engaged part L3. Thereafter, as the wheel 22 rotates, the fourth engaging part P4, the fifth engaging part P5, the sixth engaging part P6, the seventh engaging part P7, the eighth engaging part P8, the ninth engaging part P9, and the final engaging part P10 sequentially engage with the lower surfaces of the fourth engaged part L4, the fifth engaged part L5, the sixth engaged part L6, the seventh engaged part L7, the eighth engaged part L8, the ninth engaged part L9, and the final engaged part L10, thereby causing the inserter 15 and the piston 13 to move upwards. When the end engaging portion P10 engages with the lower surface of the end engaged portion L10, the aforementioned standby position is reached. For example, by appropriately controlling the start time of the electric motor 32, the electric motor 32 stops when the inserter 15 and piston 13 reach the standby position. Through the above actions, a series of inserting actions are completed.

[0081] If the inserting part N, which is struck by the downward movement of the inserter 15, is not properly inserted into the inserting part W, the deformed inserting part N may become stuck in the insertion channel 2a, resulting in a jammed nail or insufficient insertion. In this situation, such as Figure 12As shown, the inserter 15 stops at a position above the lower moving end, without reaching the lower moving end indicated by the double-dotted line. Even when the inserter is stopped, the wheel 22 continues to rotate. Therefore, the engagement part P shifts relative to the engaged part L of the inserter 15.

[0082] For example, Figure 12 , 13 As shown, a state occurs where the first engaging portion P1 does not enter the lower surface of the first engaged portion L1 and interferes with the third engaged portion L3. The lifting mechanism 20 of this embodiment includes a displacement allowing mechanism 27, which absorbs the offset generated from a position where the engaging portion P can enter the lower surface of the engaged portion L. The displacement allowing mechanism 27 has a through hole 28 provided on the wheel portion 22. A pair of parallel sliding surfaces 28a extending radially are provided on the inner wall surface of the through hole 28. The through hole 28 is formed as an elongated hole shape that is longer in the radial direction to allow the wheel portion 22 to be displaced radially relative to the rotation shaft 21. The rotation shaft 21 is inserted into the through hole 28. A pair of support planes 21a are provided on the rotation shaft 21 that are opposite to the sliding surfaces 28a and extend radially.

[0083] The sliding surface 28a slides in contact with the support plane 21a of the rotating shaft 21, thereby supporting the wheel portion 22 on the rotating shaft 21 in a manner that allows it to rotate integrally with the rotating shaft 21 and to displace radially within a certain range. By displacing the wheel portion 22 radially relative to the rotating shaft 21, interference between the engaging portion P and the engaged portion L of the inserter 15 is avoided. A compression spring 29 is installed between the inner wall of the through hole 28 and the rotating shaft 21. Through the force of the compression spring 29, the wheel portion 22 is forced towards the engaging side that brings the engaging portion P closer to the engaged portion L of the inserter 15. Therefore, against the force of the compression spring 29, the wheel portion 22 undergoes radial displacement, i.e., displacement to the side opposite to the engaging side.

[0084] like Figure 14 As shown, when the external force F on the first engaging part P1 becomes greater than the force of the compression spring 29 due to the rotation of the wheel 22, the wheel 22 as a whole resists the compression spring 29 and displaces radially. The external force F is the sliding component of the third engaged part L3 of the inserter 15. This avoids interference (engagement lock state) between the first engaging part P1 and the third engaged part L3. Because interference between the engaging part P of the wheel 22 and the engaged part L of the inserter 15 is avoided, the wheel 22 can continue to rotate smoothly.

[0085] The wheel 22 rotates while displacing away from the inserter 15, thereby causing the first engaging part P1 to pass laterally to the third engaged part L3. During this phase, the external force F from the third engaged part L3 in the sliding direction decreases. Therefore, as... Figure 15 As shown, the wheel 22 returns towards the inserter 15 under the force of the compression spring 29. As the wheel 22 returns and rotates, the lower surface of the first engaging part P1 abuts against the lower surface of the second engaged part L2. As described later, during this stage, the locking member 41 is inserted into the through hole 28, switching to a state that restricts the radial displacement of the wheel 22.

[0086] The moment when the wheel 22 is allowed to move radially is restored to a state that restricts its radial displacement is set as described above. This is the point in time when the first engaging part P1 and the engaged part L of the inserter 15 are in a normally engaged state. However, this can be modified as appropriate. For example, it can be configured to switch to the restricted state during the stage when the second engaging part P2 and the engaged part L are engaged.

[0087] The wheel 22 continues to rotate while the first engaging part P1 is normally engaged with the engaged part L, thereby displacing the inserter 15 upward from the stop position. At the moment when the inserter 15 moves upward to the standby position due to the rotation of the wheel 22, the electric motor 32 stops. Therefore, the operation of removing the stuck inserter N from the inserting channel 2a can be easily performed while preventing the inserter 15 from moving downward.

[0088] In this embodiment, within a certain range before and after the first engaging portion P1 engages with the engaged portion L, the wheel portion 22 is allowed to move radially based on the displacement allowing mechanism 27. During the stage when the second engaging portion to the end engaging portion (P2 to P10) engages with the engaged portion L of the inserter 15, the radial displacement of the wheel portion 22 is restricted by the displacement limiting mechanism 40. Figures 3-8 This describes the detailed structure of the displacement limiting mechanism 40.

[0089] The displacement limiting mechanism 40 has a locking member 41. The locking member 41 uses a cylindrical shaft member. Figure 5 , Figure 8 and Figure 16 As shown, the locking member 41 is inserted into the gap between the inner wall surface of the through hole 28 and the rotating shaft 21, thereby restricting the radial displacement of the wheel portion 22 relative to the rotating shaft 21. Figure 4 and Figure 7 As shown, the locking member 41 retracts from the through hole 28, thereby allowing the wheel 22 to move radially relative to the rotation axis 21.

[0090] The locking member 41 moves forward and backward relative to the through hole 28 by moving along the axial direction of the rotation shaft 21 (motor axis J direction). The forward and backward movement of the locking member 41 relative to the through hole 28 is performed by a cam mechanism 42. The cam mechanism 42 has a circular plate-shaped rotating cam 43 and a circular plate-shaped fixed cam 44. The rotating cam 43 and the fixed cam 44 are supported coaxially on the rotation shaft 21.

[0091] like Figure 6 As shown, the rotating shaft 21 is inserted into the support hole 43a of the rotating cam 43. Two flat bearing surfaces 43b are provided parallel to each other on the inner wall of the support hole 43a. Two flat bearing surfaces 21b facing the two bearing surfaces 43b are provided on the rotating shaft 21. With the two bearing surfaces 43b in sliding contact with the bearing surfaces 21b respectively, the rotating cam 43 is supported on the rotating shaft 21. Accordingly, the rotating cam 43 is supported on the rotating shaft 21 in a manner that allows it to rotate integrally with the rotating shaft 21 about the motor axis J and to displace along the direction of the motor axis J. Figure 6 As indicated by the arrow R, the rotary cam 43 rotates counterclockwise. In the figure, the rotation directions of the rotary shaft 21, wheel 22, and rotary cam 43 are indicated by the arrow R.

[0092] like Figure 4 , 5 As shown in Figure 6, a locking member 41 is integrally provided on the rotary cam 43. The locking member 41 is configured to protrude downward from the lower surface of the rotary cam 43. The locking member 41 protrudes parallel to the motor axis J. The locking member 41 is positioned further inward than the engaging portion P of the wheel portion 22. The locking member 41 revolves integrally with the rotary cam 43 about the motor axis J and moves integrally with the rotary cam 43 in the direction of the motor axis J.

[0093] Three compression springs 45 are arranged, for example, circumferentially evenly between the lower surface of the rotary cam 43 and the upper surface of the wheel portion 22. The compression springs 45... Figure 2 , 4 As shown in the diagram, the rotating cam 43 is forced in a direction toward the fixed cam 44 (upward) by the force of the compression spring 45. Accordingly, the locking member 41 is forced in a direction toward retraction from the through hole 28.

[0094] like Figure 6As shown, three cam portions C1, C2, and C3 are arranged along the periphery of the upper surface of the rotary cam 43. Each of the three cam portions C1, C2, and C3 has a flat cam top, a flat cam valley, and a lift portion that guides movement between the cam top and cam valley. The three cam tops 43c, 43d, and 43e are arranged around the motor axis J at intervals of, for example, 110°, 120°, and 130°, rather than being equally spaced. The lengths of the circumferential regions in the rotational direction of the three cam tops 43c, 43d, and 43e are different from each other. The circumferential regions of the first cam top 43c and the second cam top 43d are shorter than those of the third cam top 43e. The circumferential region of the third cam top 43e is the longest. The circumferential regions of the first cam top 43c and the second cam top 43d are set to be approximately the same length.

[0095] Lift sections 43f, 43g, and 43h are provided on the front side of the rotation direction of the tops of the first to third cams 43c, 43d, and 43e for guiding the fixed cam 44 to the respective cam tops 43c, 43d, and 43e. The circumferential regions of the three lift sections 43f, 43g, and 43h are set to the same length. Accordingly, the tilt angles of the three lift sections 43f, 43g, and 43h are the same. Furthermore, the three lift sections 43f, 43g, and 43h are not unequally divided in the circumferential direction. As a result, the rotating cam 43 is displaced parallel to the locking side (rear) in the direction of the motor axis J.

[0096] The fixed cam 44 functions as a cam receiving element that meshes with the first to third cam tops 43c, 43d, and 43e of the rotating cam 43, and is fixed to the cover 25a of the mechanism housing 25. Therefore, the fixed cam 44 is fixed in a manner that prevents rotation about the motor axis J and prevents movement along the motor axis J. The fixed cam 44 has three cam valleys 44a, 44b, and 44c and three cam tops 44d, 44e, and 44f in the circumferential direction. The three cam valleys 44a, 44b, and 44c are non-equally divided around the motor axis J, and the lengths of their circumferential regions are different from each other. The circumferential regions of the first cam valley 44a and the second cam valley 44b are shorter than that of the third cam valley 44c. The circumferential region of the third cam valley 44c is the longest. The circumferential region of the third cam valley 44c is set to accommodate the length of the third cam top 43e of the rotating cam 43. The circumferential regions of the first cam valley 44a and the second cam valley 44b are set to be approximately the same length.

[0097] The length of the circumferential region of the first cam valley 44a and the second cam valley 44b is shorter than the length of the circumferential region of the third cam top 43e of the rotary cam 43. Therefore, the third cam top 43e cannot enter the first cam valley 44a and the second cam valley 44b.

[0098] When the rotating cam 43 rotates relative to the fixed cam 44 in the direction of arrow R, such that the top 43e of the third cam, which has the longest circumferential area of ​​the rotating cam 43, reaches below the valley 44c of the third cam, which has the longest circumferential area of ​​the fixed cam 44, the rotating cam 43 is displaced towards the side (upward) of the fixed cam 44 by the force of the compression spring 45. Accordingly, the locking member 41 retracts upward from the through hole 28 of the wheel portion 22, thereby allowing the wheel portion 22 to move radially relative to the rotation axis 21.

[0099] Figure 7 This indicates the engaged state of the cam mechanism 42. In this engaged state, the top 43e of the third cam of the rotating cam 43 reaches below the valley 44c of the third cam of the fixed cam 44, and the rotating cam 43 moves upward by the force of the compression spring 45. Therefore, when the cam mechanism 42 is engaged, the locking member 41 disengages from the through hole 28, and the wheel portion 22 becomes capable of radial displacement (displacement restriction is released). This engaged state is achieved only in one region in the rotational direction. Therefore, the disengagement action of the locking member 41 from the through hole 28 only occurs within a certain angular range of the rotational action of the wheel portion 22 as shown below.

[0100] The relative position of the rotating cam 43, which rotates integrally with the wheel 22, to the fixed cam 44 in the direction of rotation is set such that, during the stage when the first engaging portion P1 engages with the engaged portion L of the inserter 15, the top of the third cam 43e is located below the valley of the third cam 44c. Therefore, the locking member 41 disengages from the through hole 28 no later than before the first engaging portion P1 interferes with the engaged portion L, thereby allowing the wheel 22 to move radially. By allowing the wheel 22 to move radially, interference between the engaging portion P of the wheel 22 and the engaged portion L of the inserter 15 is avoided.

[0101] The moment before the first engaging portion P1 interferes with the engaged portion L corresponds to the initial stage when the inserter 15 begins to move upward, that is, the initial stage of engagement when the first engaging portion P1 of the wheel 22 engages with the engaged portion L of the inserter 15. In this embodiment, the relative positions of the rotating cam 43 and the fixed cam 44 around the motor axis J are set in a manner that allows the wheel 22 to move radially, for example, when the first engaging portion P1 enters the inserting channel 2a through the window 25b of the mechanism housing 25 (i.e., when it engages with the third engaged portion L3).

[0102] Figure 8 This indicates the non-engaged state of the cam mechanism 42. For example... Figure 8As shown, when the top 43e of the third cam of the rotating cam 43 is offset from below the valley 44c of the third cam of the fixed cam 44 in the rotational direction, or is not below the valley 44c, even if the tops 43c and 43d of the first and second cams are below the valleys 44b and 44c of the second and third cams, a portion of the top 43e of the third cam abuts against the top 44d of the third cam of the fixed cam 44. Therefore, this becomes a non-engaged state that restricts the upward displacement of the rotating cam 43. In this non-engaged state, the rotating cam 43 maintains its downward movement against the compression spring 45. Figure 8 The displacement state is indicated by the direction of the arrow D. Therefore, the locking member 41 is maintained in the state of entering the through hole 28, and the displacement of the wheel 22 relative to the rotation axis 21 is restricted in a displacement-limited state.

[0103] Thus, in the region where the top 43e of the third cam of the rotating cam 43, which rotates in the direction of arrow R via the wheel portion 22, is located below the valley 44c of the third cam of the fixed cam 44, the rotating cam 43 engages with the fixed cam 44. Accordingly, by displacing the rotating cam 43 upward, the locking member 41 disengages from the insertion hole 28, allowing the wheel portion 22 to move radially. As described above, the area where the locking member 41 disengages from the insertion hole 28 is set within a portion of the rotational region of the wheel portion 22. In this embodiment, it is set in a certain area before and after the first engaging portion P1 engages with the engaging portion L of the inserter 15.

[0104] In this embodiment, for example, at the moment when the first engaging portion P1 engages with the engaged portion L, or at the stage when the second engaging portion P2 is about to engage with the engaged portion L of the inserter 15, the locking member 41 enters the through hole 28, thus restricting the radial displacement of the wheel portion 22. At the stage when the second engaging portion P2 engages with the engaged portion L, the first engaging portion P1 has already engaged with the engaged portion L. Accordingly, by slightly moving the inserter 15 upwards, the relative position of the second engaging portion P2 with respect to the engaged portion L is corrected to a smooth engaging state. Therefore, at the stage when the second engaging portion P2 engages with the engaged portion L, it is preferable to restrict the radial displacement of the wheel portion 22 to achieve a reliable engaging state, rather than allowing the wheel portion 22 to move radially.

[0105] The wheel 22 continues to rotate while its radial displacement is restricted, thereby engaging with the engaged portion L in the order of the third engaging portion P3, the fourth engaging portion P4, and so on, thus causing the inserter 15 to move upward. As described above, except for the initial stage when the inserter 15 moves upward after the first engaging portion P1 engages with the engaged portion L, the radial displacement of the wheel 22 is restricted by the displacement limiting mechanism 40. Therefore, the second engaging portion P2, the third engaging portion P3, and so on, and the final engaging portion P10 reliably engage with the engaged portion L in sequence. Accordingly, while bearing the gas pressure applied by the accumulator 14 via the inserter 15, the wheel 22 reliably transmits the power for moving the inserter 15 upward to the inserter 15.

[0106] For example, such as Figure 16 As shown, in the stage where the displacement direction of the wheel 22 (the direction of the sliding contact surface between the support plane 21a and the sliding surface 28a) is parallel or approximately parallel to the movement direction (vertical direction) of the inserter 15, almost all of the thrust generated by the gas pressure in the accumulator chamber 14 acts as an external force in the direction of displacement of the wheel 22. However, in this stage, the locking member 41 is inserted into the through hole 28, thereby restricting the radial displacement of the wheel 22. Therefore, through the engagement state of the fourth engaging part P4 and the end engaging part L10, the wheel 22 reliably transmits the power of the drive unit 30 to the inserter 15 while bearing the thrust of the accumulator chamber 14. Accordingly, the inserter 15 is reliably moved upward.

[0107] The inserter 15 returns to the standby position by sequentially engaging the engaging part P with the engaged part L through the rotation of the wheel 22. During this stage, the electric motor 32 stops, and the inserter 15 remains in the standby position. Accordingly, as described above, the operator can remove inserts N stuck in the insert channel 2a. Afterward, the drive unit 30 is restarted by pulling the switch lever 3a, causing the inserter 15 to move to the upper moving end. When the inserter 15 reaches the upper moving end, the wheel 22 spins freely, thereby correcting the positional offset of the engaging part P relative to the engaged part L of the inserter 15. After correcting to the engagement state where the final engaging part P10 engages with the final engaged part L10, the wheel 22 rotates further to disengage the engagement, thereby causing the inserter 15 to move downwards to perform the inserting action.

[0108] According to the driving tool 1 described above, the wheel portion 22 of the lifting mechanism 20 can be radially displaced relative to the rotation axis 21 by the displacement allowance mechanism 27. This avoids interference between the first engaging portion P1 and the engaged portion L of the driver 15 (abnormal engaging state), thereby engaging the first engaging portion P1 with the lower surface of the engaged portion L. Therefore, even in the event of nail jamming, the driver 15 can quickly and smoothly return to the standby position.

[0109] In the illustrated embodiment, interference with the first engaging portion P1 is avoided by displacing the entire wheel portion 22 radially relative to the rotation axis 21. Accordingly, a simplified structure can be achieved compared to a structure that displaces only a portion of the wheel portion.

[0110] The radial displacement of the wheel 22 occurs only in the initial stage of the upward movement of the inserter 15 (the stage where the first engaging part P1 engages or interferes with the engaged part L). During the stages where the second to the last engaging parts (P2 to P10) engage with the engaged part L, the radial displacement of the wheel 22 is limited by the displacement limiting mechanism 40. Accordingly, the lifting mechanism 20 reliably performs the upward movement of the inserter 15 while bearing the gas pressure of the accumulator chamber 14.

[0111] In the illustrated embodiment, when the displacement direction of the wheel 22 (the surface direction of the sliding surface 28a) is parallel to the moving direction of the inserter 15, the wheel 22 is already in a state where the radial displacement is restricted by the movement limiting mechanism 40. When the direction of the force acting on the wheel 22 from the inserter 15 (the moving direction of the inserter 15) is consistent with the displacement direction of the wheel 22, the engaging portion P is subjected to a large external force (the thrust of gas pressure) from the wheel displacement direction of the inserter 15. Therefore, at least at this stage, the radial displacement of the wheel is restricted by the displacement limiting mechanism, thereby maintaining the engagement state between the lifting mechanism 20 and the inserter 15 effectively and preventing malfunctions.

[0112] In the illustrated embodiment, the locking member 41 enters between the through hole 28 of the wheel portion 22 and the rotation axis 21 supporting the wheel portion 22, thereby restricting the radial displacement of the wheel portion 22 relative to the rotation axis 21. When the locking member 41 exits from the through hole 28, the wheel portion 22 is allowed to move radially relative to the rotation axis 21. Through this simple structure of moving the locking member 41 forward and backward relative to the through hole 28, it is possible to switch between a state allowing radial displacement of the wheel portion 22 and a state restricting radial displacement of the wheel portion 22.

[0113] In the illustrated embodiment, the locking member 41 is displaced along the axial direction of the rotation shaft 21 (motor axis J direction) to move forward and backward relative to the through hole 28. The forward and backward movement of the locking member 41 relative to the through hole 28 is achieved through a simple and compact structure.

[0114] In the illustrated embodiment, the locking member 41 is located on the inner peripheral side of the engagement portion P, thereby achieving a compact displacement limiting mechanism 40.

[0115] In the illustrated embodiment, the locking member 41 is engaged in the insertion hole 28 by means of the rotational movement of the wheel 22 via the cam mechanism 42, and disengaged from the insertion hole 28 by means of the rotational movement of the wheel 22. The cam mechanism 42 enables precise and reliable movement of the locking member 41.

[0116] In the illustrated embodiment, a pair of sliding surfaces 28a of the through hole 28 slide in contact with a pair of support surfaces 21a of the rotating shaft 21, thereby integrating the wheel portion 22 with the rotating shaft 21 in terms of rotation, and supporting the wheel portion 22 on the rotating shaft 21 in a manner that allows it to be displaced radially relative to the rotating shaft 21.

[0117] In the illustrated embodiment, a compression spring 29 installed in the insertion hole 28 applies force to the wheel portion 22 in a direction approaching the inserter 15. Accordingly, the wheel portion 22 returns to a position coaxial with the rotation shaft 21 (the engaged position normally engaged with the inserter 15). By installing the compression spring 29 within the insertion hole 28, the displacement-allowing mechanism 27 can be made more compact.

[0118] In the illustrated embodiment, the displacement limiting mechanism 40 has a compression spring 45 that applies force to the locking member 41 in a direction that causes it to retract from the insertion hole 28. Accordingly, the locking member 41 can be reliably retracted from the insertion hole 28 with a simple structure.

[0119] In the illustrated embodiment, the cam mechanism 42 has multiple cam portions C1, C2, and C3, which are non-equally arranged around the axis of the rotation shaft 21 (around the motor axis J). Accordingly, the rotating cam 43 and the fixed cam 44 engage only at one location around the axis of the rotation shaft 21. Accordingly, the forward and backward movement of the locking member 41 relative to the through hole 28 is respectively fixed at one location around the axis of the rotation shaft 21. Therefore, a state that allows radial displacement of the wheel portion 22 and a state that restricts radial displacement of the wheel portion 22 can be reliably achieved at a fixed location around the axis of the rotation shaft 21. Accordingly, a good engagement state of the lifting mechanism 20 relative to the inserter 15 is maintained.

[0120] Various modifications can be made to the embodiments described above. For example, in the lifting mechanism 20, a wheel portion 22 with 10 engaging portions P and an inserter 15 with 10 engaged portions L are illustrated, but the number of engaging portions P and engaged portions L is not limited to 10. The number of engaging portions P and engaged portions L is appropriately set according to main factors such as the stroke of the inserter or the size of the main body portion 10.

[0121] An example is shown of a compression spring 29 as a force-applying component that applies force from the coupling 22 to the inserter 15, but it can also be replaced with other force-applying components such as a leaf spring or polyurethane rubber. The force-applying component that applies force from the coupling 22 to the inserter 15 can also be configured to be disposed outside the through hole 28.

[0122] Regarding the three cam tops 43c, 43d, and 43e of the rotary cam 43, an example is shown where the circumferential regions are of different lengths and the starting points are arranged at different intervals in the circumferential direction to achieve an unequal circumferential configuration. However, it is also possible to achieve an unequal circumferential configuration by having the starting points at the same intervals and different lengths of the circumferential regions, or by having the circumferential regions of the same length and different intervals of the starting points. In either case, it is possible to achieve a configuration where the rotary cam and the fixed cam engage only at one location in the rotational direction. Furthermore, regarding the three lift sections 43f, 43g, and 43h, an example is shown where the circumferential regions are of the same length (achieving the same lift through the same tilt angle) and are arranged unequally in the circumferential direction. However, if the starting points at the cam tops are at the same intervals but have different lengths in the circumferential direction, it is also possible to have the circumferential regions of the same length arranged equally in the circumferential direction.

[0123] The multiple cam sections of the cam mechanism are not limited to the three locations around the axis illustrated, but can also be two locations or more than four locations.

[0124] As illustrated above, it is preferable to set the displacement direction of the wheel 22 to be approximately parallel to the direction of the external force F received by the first engaging portion P1, wherein the external force F originates from the engaging portion L of the inserter 15. Accordingly, when the first engaging portion P1 interferes with the engaging portion L, the wheel 22 displaces more smoothly in a direction away from the engaging portion L. However, it is permissible for the displacement direction of the wheel 22 to be appropriately offset relative to the direction of the external force F in the direction surrounding the motor axis J.

[0125] Figures 17-26 The lifting mechanism 50 according to the second embodiment is illustrated. The lifting mechanism 50 according to the second embodiment has the same displacement allowing mechanism 60 as the first embodiment and a displacement limiting mechanism 70 that is different from the first embodiment. For components and structures that can be the same as those in the first embodiment but do not need to be changed in the second embodiment, the same reference numerals are used and their descriptions are omitted.

[0126] The lifting mechanism 50 according to the second embodiment has a rotating shaft 51 and a wheel 52, wherein the rotating shaft 51 is rotated by an electric motor 32; the wheel 52 is supported by the rotating shaft 51. When the electric motor 32 is started, the wheel 52 of the lifting mechanism 50 rotates integrally. The wheel 52 has two flange portions 52a spaced apart and parallel to each other. A plurality of engaging portions P span between the peripheral portions of the two flange portions 52a and are arranged parallel to each other with both ends supported. In the second embodiment, 10 engaging portions P (P1 to P10) are also shown. Each engaging portion P uses a cylindrical shaft component (pin).

[0127] Similar to the first embodiment, on the right side of the inserter 15, ten engaging portions L (L1 to L10) are arranged at intervals along the length direction (vertical direction). With each engaging portion P of the wheel 52 engaged with the engaging portion L of the inserter 15, the wheel 52 rotates, causing the inserter 15 and piston 13 to return to the top. The wheel 52 rotates counterclockwise as shown by arrow R in the figure when the electric motor 32 is activated.

[0128] The lifting mechanism 50 according to the second embodiment has a displacement allowing mechanism 60 for allowing the wheel portion 52 to move radially. The displacement allowing mechanism 60 has a through hole 61 provided on the wheel portion 52. A pair of parallel sliding surfaces 61a extending radially are provided on the inner wall surface of the through hole 61. The through hole 61 is formed into an elongated hole shape that is longer in the radial direction to allow the wheel portion 52 to move radially relative to the rotation axis 51.

[0129] A rotating shaft 51 is inserted into a through hole 61. The sliding surface 61a of the through hole 61 is in sliding contact with the supporting plane 51a of the rotating shaft 51. Accordingly, the wheel portion 52 is supported on the rotating shaft 51 in a manner that allows it to rotate integrally with the rotating shaft 51 and to displace radially within a certain range. By displacing the wheel portion 52 radially relative to the rotating shaft 51, interference between the engaging portion P and the engaged portion L of the inserter 15 is avoided. A compression spring 62 is installed between the inner wall surface of the through hole 61 and the rotating shaft 51. The force of the compression spring 62 applies a force to the wheel portion 52 toward the engaging side that brings the engaging portion P closer to the engaged portion L of the inserter 15. Therefore, the radial displacement of the wheel portion 52, i.e., displacement toward the side opposite to the engaging side, is achieved against the force of the compression spring 62. Figures 20-22 As shown, when the wheel 52 resists the compression spring 62 and moves to the side opposite to the engaging side, a gap 61b equivalent to the displacement distance is generated between the outer peripheral surface of the rotating shaft 51 on the side opposite to the compression spring 62 and the inner peripheral surface of the through hole 61.

[0130] The lifting mechanism 50 of the second embodiment includes a displacement limiting mechanism 70, which limits the radial displacement of the wheel portion 52. The displacement limiting mechanism 70 includes limiting circular plates 71 and 72 and limiting components 73 and 74. Figure 17 , 18 As shown, limiting circular plates 71 and 72 are arranged above and below the wheel portion 52. The two limiting circular plates 71 and 72 have approximately the same diameter and are arranged coaxially and parallel to each other. The two limiting circular plates 71 and 72 are fixed to the mechanism housing 25. Therefore, even when the electric motor 32 is started, the two limiting circular plates 71 and 72 do not rotate. Through holes 71a and 72a are provided at the center of the two limiting circular plates 71 and 72. The rotating shaft 51 is inserted into the two through holes 71a and 72a in a manner that allows for relative rotation. An arc-shaped notch 72d is provided within a certain range of the outer periphery of the lower limiting circular plate 72. This notch 72d facilitates the assembly of the nail cartridge 6 onto the driving head 2.

[0131] Limiting wall portions 71b and 72b are respectively provided on the lower surface of the upper limiting circular plate 71 and the upper surface of the lower limiting circular plate 72. The limiting wall portions 71b and 72b are arranged symmetrically vertically. In the second embodiment, the outer peripheral wall surface of the groove provided on the limiting circular plates 71 and 72 is the limiting wall portion 71b and 72b. On the limiting wall portions 71b and 72b, a limiting release portion 71c and 72c are respectively provided at a position in the circumferential direction. In the second embodiment, the recessed portion extending outward is the limiting release portion 71c and 72c.

[0132] The upper release part 71c and the lower release part 72c are arranged facing each other at the same position around the motor axis J. The two release parts 71c and 72c are positioned on the side opposite to the inserter 15 relative to the rotation axis 51. The two release parts 71c and 72c are positioned within a certain angular range (e.g., approximately 40°) around the motor axis J. In the second embodiment, they are positioned opposite to the two adjacent engaging parts P (in... Figure 19 , 20 The angle range corresponding to the interval between the 6th and 7th engaging parts (P6 and P7) is shown in the middle. The angle range of the limiting release parts 71c and 72c can also be expanded to about 60°.

[0133] like Figure 21As shown, the upper and lower limiting members 73 and 74 are provided using the engaging portion P of the wheel portion 52. In the second embodiment, the limiting members 73 and 74 are provided using the seventh engaging portion P7 out of the ten engaging portions P. The upper and lower ends of the seventh engaging portion P7 protrude upwards and downwards from the flange portion 52a, respectively. The roller body is supported on the protruding portion of the seventh engaging portion P7 in a manner that allows it to rotate freely about an axis. The upper and lower roller bodies are the limiting members 73 and 74, respectively.

[0134] The upper and lower limiting members 73 and 74 move along the limiting walls 71b and 72b in conjunction with the rotation of the wheel 52. With the limiting members 73 and 74 moving along the limiting walls 71b and 72b, the wheel 52 is restricted to radial displacement relative to the rotation axis 51. Therefore, the wheel 52 rotates about the motor axis J in the direction of arrow R.

[0135] like Figure 19 , 20 As shown, by rotating the wheel 52 in the direction of arrow R, the first engaging part P1 enters the insertion channel 2a and engages with the engaging part L of the inserter 15. Figure 22 , 23 As shown, in this stage, the limiting members 73 and 74, supported on the seventh engaging part P7 on the side opposite to the first engaging part P1, disengage from the limiting walls 71b and 72b and enter the limiting release parts 71c and 72c, respectively. When the limiting members 73 and 74 reach the limiting release parts 71c and 72c, they can be displaced outward (entering into the limiting release parts 71c and 72c). Accordingly, the wheel part 52 is in a limiting-released state, capable of resisting the compression spring 62 and displacing in the direction away from the inserter 15.

[0136] Therefore, similar to the first embodiment, when the engagement is offset due to a nail jamming or other reasons, and a large external force F is applied to the wheel portion 52 via the first engaging portion P1, such as Figures 20-22 As shown, the wheel portion 52 as a whole resists the compression spring 62 and moves radially. Therefore, a gap 61b is generated between the rotating shaft 51 and the through hole 61. This avoids interference (engagement lock state) between the first engaging portion P1 and the third engaged portion L3.

[0137] While displacing away from the inserter 15, the wheel 52 rotates in the direction of arrow R, thereby causing the first engaging part P1 to pass laterally to the third engaging part L3. During this stage, the external force F acting on the wheel 52 in the sliding direction from the third engaging part L3 gradually decreases. Therefore, as... Figure 24As shown, the wheel 52 returns towards the inserter 15 due to the force of the compression spring 62. The wheel 52 rotates as it returns, causing the lower surface of the first engaging part P1 to abut against the lower surface of the second engaged part L2. During this stage, the limiting members 73 and 74 disengage from the limiting release parts 71c and 72c, and again move along the limiting walls 71b and 72b. Therefore, the state of limiting the radial displacement of the wheel 52 is switched.

[0138] With the first engaging part P1 normally engaged with the lower surface of the engaged part L, the wheel 52 continues to rotate, thereby displacing the inserter 15 upward from the stop position. Figure 25 , 26 As shown, during this stage, the upper and lower limiting members 73 and 74 are maintained in a state of movement along the limiting walls 71b and 72b, thereby maintaining the radial displacement of the limiting wheel 52 relative to the rotation axis 51. Accordingly, the inserter 15 returns to the upper standby position.

[0139] According to the second embodiment illustrated above, within a certain range before and after the first engaging portion P1 engages with the engaged portion L, the wheel portion 52 is allowed to move radially based on the displacement allowing mechanism 60. During the stage when the second to the last engaging portions (P2 to P10) engage with the engaged portion L of the inserter 15, the radial displacement of the wheel portion 52 is restricted by the displacement limiting mechanism 70.

[0140] The timing at which the wheel 52 can be radially displaced by the displacement allowing mechanism 60 can be appropriately changed. Therefore, the positions of the limiting members 73 and 74 can be changed to positions after displacement from the illustrated seventh engaging part P7 towards the front or rear of the rotation direction. Furthermore, the positions of the limiting releasing parts 71c and 72c around the motor axis J can also be changed to positions after displacement towards the front or rear of the rotation direction. Moreover, as described above, the angular range of the limiting releasing parts 71c and 72c can be expanded or reduced from the illustrated range of approximately 40°.

[0141] Similar to the first embodiment, the time when the wheel 52 returns from a state that allows radial displacement to a state that restricts radial displacement is set to the point at which the first engaging part P1 is normally engaged with the engaged part L of the inserter 15. However, this can be appropriately modified. For example, it can be configured such that, during the stage when the second engaging part P2 engages with the engaged part L, the restricting members 73 and 74 disengage from the restricting release parts 71c and 72c and switch to a restricting state.

[0142] According to the second embodiment, since the cam mechanism 42 of the first embodiment can be omitted, the lifting mechanism 50 can be made more compact and its structure simplified in the direction of the motor axis J.

[0143] The second embodiment can be further modified. For example, a structure with two limiting members 73 and 74 on the upper and lower sides of the wheel portion 52 is illustrated, but one of them may be omitted.

[0144] Although the example shown is a structure in which the limiting members 73 and 74 are configured using a locking part P (the 7th locking part P7), a structure in which limiting members other than the locking part P are configured may also be adopted.

[0145] In the second embodiment, the structure in which the outer peripheral wall of the groove is used as the limiting wall 71b, 72b is illustrated. However, the limiting wall can also be provided with a wall of annular protrusions in a symmetrical manner on the opposing surfaces of the upper and lower limiting circular plates 71, 72.

[0146] The insertion tool 1 of the first and second embodiments is an example of an insertion tool according to one aspect of the present invention. The piston 13 of the first and second embodiments is an example of a piston according to one aspect of the present invention. The inserter 15 of the first and second embodiments is an example of an inserter according to one aspect of the present invention. The engaging portions L (L1 to L10) of the first and second embodiments are examples of a plurality of engaging portions according to one aspect of the present invention.

[0147] The lifting mechanism 20 of the first embodiment and the lifting mechanism 50 of the second embodiment are examples of lifting mechanisms in one aspect of the present invention. The rotating shaft 21 of the first embodiment and the rotating shaft 51 of the second embodiment are examples of rotating shafts in one aspect of the present invention. The wheel portion 22 of the first embodiment and the wheel portion 52 of the second embodiment are examples of wheel portions in one aspect of the present invention. The engaging portions P (P1-P10) of the first and second embodiments are examples of engaging portions in one aspect of the present invention.

[0148] The displacement allowing mechanism 27 of the first embodiment and the displacement allowing mechanism 60 of the second embodiment are examples of displacement allowing mechanisms in one aspect of the present invention. The displacement limiting mechanism 40 of the first embodiment and the displacement limiting mechanism 70 of the second embodiment are examples of displacement limiting mechanisms in one aspect of the present invention. The first engaging portion P1 of the first and second embodiments is an example of a first engaging portion in one aspect of the present invention. The second engaging portion P2 of the first and second embodiments is an example of a second engaging portion in one aspect of the present invention.

Claims

1. An injection tool, characterized in that, It has a piston, an inserter, and a lifting mechanism, among which, The piston moves in the injection direction under gas pressure; The inserter moves integrally with the piston to strike the insert; The lifting mechanism causes the inserter to move in the opposite direction to the inserting direction. The inserter has multiple engaging portions along its long side. The lifting mechanism includes a rotating shaft, wheels, multiple engaging parts, a displacement allowing mechanism, and a displacement limiting mechanism. The wheel rotates together with the rotation axis with the rotation axis as the center; The plurality of engaging portions are arranged within a certain range along the circumference of the wheel portion and engage sequentially with the engaging portion of the inserter by rotating together with the rotating shaft; The displacement allows the mechanism to be inserted into the rotating shaft in a radially elongated through hole formed in the wheel portion, and allows the wheel portion to be radially displaced relative to the rotating shaft. The displacement limiting mechanism has a locking member that limits the radial displacement of the wheel relative to the rotation axis by engaging the locking member with the through hole. A clearance portion is provided in the remaining circumferential range of the wheel portion, excluding a certain range in the circumferential direction. This clearance portion allows the inserter to move in the inserting direction. The plurality of engaging portions include a first engaging portion, which is located immediately after and adjacent to the clearance portion in the rotational direction of the wheel portion when the lifting mechanism moves the inserter in a direction opposite to the insertion direction, and is the first engaging portion to engage with the engaged portion. At least during the stage when the first engaging part engages with the engaged part, causing the inserter to begin moving in the opposite direction to the inserting direction, the locking member disengages from the through hole, thereby releasing the displacement limiting mechanism from restricting the displacement of the wheel.

2. The insertion tool according to claim 1, characterized in that, The plurality of engaging portions include a second engaging portion, which is a second engaging portion that engages with the engaged portion. At least during the stage when the second engaging portion engages with the engaged portion, the displacement limiting mechanism restricts the radial displacement of the wheel portion.

3. The insertion tool according to claim 1 or 2, characterized in that, The radial displacement of the wheel is restricted during the stage where the displacement direction of the wheel relative to the rotation axis is at least parallel to the movement direction of the driver.

4. The insertion tool according to claim 1, characterized in that, The locking component moves forward and backward relative to the through hole by displacing along the axial direction of the rotation axis.

5. The insertion tool according to claim 1, characterized in that, The locking component is located on the inner periphery side of the engaging portion.

6. The insertion tool according to claim 1 or 2, characterized in that, The displacement limiting mechanism has a cam mechanism that causes the locking member to move forward and backward relative to the through hole as the wheel rotates.

7. The driving tool according to claim 1 or 2, characterized in that, The wall surface constituting the through hole has a pair of sliding surfaces that are parallel to each other and extend along the radial direction. The rotating shaft has a pair of support planes, which face the pair of sliding surfaces and extend along the radial direction.

8. The insertion tool according to claim 1 or 2, characterized in that, The device has a force-applying component installed in the through hole, which applies force to the wheel in a direction that causes the engaging portion of the wheel to engage with the engaged portion of the inserter.

9. The insertion tool according to claim 1 or 2, characterized in that, The displacement limiting mechanism has a force-applying component that applies force to the locking component in a direction that causes it to retract from the through hole.

10. The insertion tool according to claim 6, characterized in that, The cam mechanism has multiple cam portions, which are non-equally arranged around the axis of the rotation shaft. All of the multiple cam portions engage with the cam bearing side at one location around the axis of the rotation shaft, thereby fixing the advancing and retracting movement of the locking member relative to the through hole at one location around the axis of the rotation shaft.

11. An insertion tool, characterized in that, It has a piston, an inserter, and a lifting mechanism, among which, The piston moves in the injection direction under gas pressure; The inserter moves integrally with the piston to strike the insert; The lifting mechanism causes the inserter to move in the opposite direction to the inserting direction. The inserter has multiple engaging portions along its long side. The lifting mechanism includes a rotating shaft, wheels, multiple engaging parts, a displacement allowing mechanism, and a displacement limiting mechanism. The wheel rotates together with the rotation axis with the rotation axis as the center; The plurality of engaging portions are arranged within a certain range along the circumference of the wheel portion and engage sequentially with the engaging portion of the inserter by rotating together with the rotating shaft; The displacement allows the mechanism to be inserted into the rotating shaft in a radially elongated through hole formed in the wheel portion, and allows the wheel portion to be radially displaced relative to the rotating shaft. The displacement limiting mechanism restricts the wheel portion from moving radially. The displacement limiting mechanism includes: (i) a limiting member disposed on the wheel portion; (ii) a limiting wall portion disposed around the wheel portion and abutting against the limiting member to limit the radial displacement of the wheel portion; and (iii) a limiting release portion recessed outwardly along the circumference of the wheel portion for releasing the abutment state relative to the limiting wall portion and allowing the wheel portion to move radially. A clearance portion is provided in the remaining circumferential range of the wheel portion, excluding a certain range in the circumferential direction. This clearance portion allows the inserter to move in the inserting direction. The plurality of engaging portions include a first engaging portion, which is located immediately after and adjacent to the clearance portion in the rotational direction of the wheel portion when the lifting mechanism moves the inserter in a direction opposite to the insertion direction, and is the first engaging portion to engage with the engaged portion. At least during the stage when the first engaging portion engages with the engaged portion and the inserter begins to move in the opposite direction to the inserting direction, the abutment state of the restricting member relative to the restricting wall portion is released, and the displacement restriction state of the wheel portion based on the restricting member is released.

12. The insertion tool according to claim 11, characterized in that, The limiting component protrudes onto two surfaces in the axial direction of the wheel.

13. The insertion tool according to claim 12, characterized in that, The two ends of the engaging portion protrude toward two surfaces in the axial direction of the wheel portion, and the limiting member is set by the protruding portion of the engaging portion.

14. The insertion tool according to claim 13, characterized in that, The limiting member is positioned relative to the rotation axis on the side facing the first engaging portion.

15. The driving tool according to any one of claims 11 to 14, characterized in that, A roller capable of rotating freely around an axis is provided on the limiting component.

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