Driving tool

Abstract

To provide a driving tool that moves a driver by gas pressure to make a driving jig drive and return the driver from a lower movable end to a position of an upper movable end by engaging a wheel of a lift mechanism therewith, which is configured to be able to regularly perform driving motion stably by correcting displacement of engagement, which can solve the problem that engagement of the wheel with the driver is sometimes displaced due to jammed nails or the like and the problem that when the driver is returned to a stand-by position with the engagement being displaced, subsequent driving motion cannot be performed stably.SOLUTION: A diameter of a ninth engagement part P9 which is a final front engagement part is smaller than a diameter of the other engagement part P. This makes engagement of the ninth engagement part P9 with a tenth part L10 to be engaged shallower. When the engagement of the ninth engagement part P9 is made shallower and therefore is released, a driver 15 moves down to a stand-by position. This can correct the engagement into a normal engagement state where a tenth engagement part P10 is engaged with the tenth part L10 to be engaged at the stand-by position.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a driving tool for driving driving tools such as nails and staples into wood or the like. [Background Art]

[0002] Patent Document 1 discloses a gas spring type driving tool that uses the thrust of compressed gas as a striking force. A gas spring type driving tool includes a piston that moves up and down in a cylinder, and a driver that is coupled to the piston, moves downward integrally, and strikes a driving tool. The piston and the driver move downward in the driving direction by the gas pressure of the pressure accumulating chamber. The piston and the driver are returned in the counter-driving direction by a lift mechanism.

[0003] The lift mechanism has a wheel provided with a plurality of engaging portions that are sequentially engaged with a plurality of engaged portions provided on the driver. The wheel is rotated by an electric motor. After the driving operation, the wheel rotates and the engaging portions sequentially mesh with the engaged portions of the driver, thereby moving the driver upward in the counter-driving direction. When the piston is moved upward in the counter-driving direction, the gas pressure in the pressure accumulating chamber is increased. When the driver is moved upward to the upward end position, the engaged state of the lift mechanism with respect to the driver is released. Thereby, the driver is moved downward by the gas pressure and a striking operation is performed. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent No. 6485544 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] In such nail driving tools, if the driver stops before reaching the lower moving end due to, for example, a nail jam, the engagement of the lift mechanism with the engaged part of the driver may become misaligned. If the driver reaches the upper moving end with this misaligned engagement during the next driving operation, the driving force may become unstable.

[0006] In this disclosure, even if the engagement of the lift mechanism with the driver becomes misaligned, the misalignment is corrected for the next driving operation, so that the driving operation is performed with a stable driving force. [Means for solving the problem]

[0007] According to one aspect of this disclosure, the driving tool includes, for example, a piston that moves in the driving direction by gas pressure, a driver provided on the piston and moving integrally with the piston to strike the driving tool, and a wheel that moves the driver in the opposite direction to the driving direction. The driver includes, for example, a plurality of engaging parts arranged along the driving direction. The wheel includes a plurality of engaging parts that sequentially engage with the engaging parts of the driver as it rotates to move the driver in the opposite direction to the driving direction.

[0008] For example, multiple engagement parts have an outer region located on the driver side in a direction perpendicular to the driving direction when engaging with the driver. For example, the final pre-engagement part that engages with the driver just before the last engagement part that moves the driver in the opposite direction of driving has an outer region that is further away from the driver than the outer regions of the other engagement parts when engaging with the driver.

[0009] Therefore, when the driver is moved in the opposite direction of driving, the engagement (meshing) of the final pre-engaging part of the driver with respect to the engaged part becomes shallower than that of the other engaging parts. As the wheel rotates in this shallow engagement state, the engagement of the final pre-engaging part with respect to the final engaged part disengages. This corrects the misalignment of the engagement, and the wheel stops in a normal engagement state where the last engaging part is engaged with the final engaged part. Thus, the next driving operation is stabilized.

[0010] In other aspects of the present disclosure, a driving tool includes, for example, a piston that moves in the driving direction by gas pressure, a driver provided on the piston and moving integrally with the piston to strike a driving tool, and a wheel that moves the driver in the opposite direction to the driving direction. The driving tool includes, for example, a guide surface that slidably supports the driver on the opposite side of the wheel. For example, the driver includes a plurality of engaging parts arranged along the driving direction. The plurality of engaging parts include, for example, a final engaging part that last engages with the wheel when moving in the opposite direction to the driving direction. For example, the wheel includes a plurality of engaging parts that sequentially engage with the engaging parts of the driver when rotating to move the driver in the opposite direction to the driving direction.

[0011] For example, the multiple engagement portions include a final pre-engagement portion that engages with the driver one before the last engagement portion that moves the driver in the opposite direction of driving. For example, in the abnormal case where the final engaged portion engages with the final pre-engagement portion, a relief portion is formed on the guide surface that allows the driver to move away from the wheel.

[0012] Therefore, as the driver reaches the relief section, the engagement of the final pre-engaging part with the final engaged part becomes shallower. As the wheel rotates in this shallow engagement state, the engagement of the final pre-engaging part with the final engaged part disengages. This corrects the misalignment of the engagement, and the wheel stops in a normal engagement state where the last engaging part is engaged with the final engaged part. Thus, the next driving operation is stabilized. [Brief explanation of the drawing]

[0013] [Figure 1] This is an overall right side view of the driving tool. [Figure 2] Figure 1 shows a cross-sectional view taken along line II-II, which is a lateral cross-sectional view of the lift mechanism. [Figure 3] Figure 1 shows a cross-sectional view taken along line III-III, which is a longitudinal cross-sectional view of the tool body. [Figure 4]It is a longitudinal sectional view of the lift mechanism. This figure shows the state where the driver has reached the lower moving end, immediately after driving. [Figure 5] It is a longitudinal sectional view of the lift mechanism. This figure shows the initial state where the driver is stopped at the standby position. [Figure 6] It is a longitudinal sectional view of the lift mechanism. This figure shows a state where the driver is stopped during downward movement and the meshing engagement with the wheel is displaced. [Figure 7] It is a longitudinal sectional view of the lift mechanism. This figure shows a state where the driver has reached the upper moving end with the meshing engagement of the wheel displaced. [Figure 8] It is a diagram showing the difference in diameters and the positional relationship among the eighth engaging portion, the ninth engaging portion, and the tenth engaging portion. [Figure 9] It is an enlarged view of the tip end of the driver. [Figure 10] It is a longitudinal sectional view of the lift mechanism according to the second embodiment. This figure shows a state where the driver has reached the upper moving end with the meshing engagement of the wheel displaced. [Figure 11] It is a longitudinal sectional view of the lift mechanism according to the second embodiment. This figure shows a state where the displacement of the meshing engagement of the wheel is corrected and the driver is stopped at the standby position. [Figure 12] It is a diagram showing the second embodiment regarding the positional relationship among the eighth engaging portion, the ninth engaging portion, and the tenth engaging portion. [Figure 13] It is a longitudinal sectional view of the lift mechanism according to the third embodiment. This figure shows a state where the driver has reached the upper moving end with the meshing engagement of the wheel kept displaced. [Figure 14] It is an enlarged view of section XIV in Figure 13, which is a longitudinal sectional view of the driving passage. [Figure 15] It is a longitudinal sectional view of the lift mechanism according to the third embodiment. This figure shows a state where the driver is stopped at the standby position. [Figure 16] It is an enlarged view of section XVI in Figure 15, which is a longitudinal sectional view of the driving passage. DETAILED DESCRIPTION OF THE INVENTION

[0014] In one or more embodiments, for example, the penultimate engagement portion is last smaller in diameter than the engagement portion of, whereby the outer region of the penultimate engagement portion is last farther from the driver than the engagement portion of. This results in shallower meshing of the penultimate engagement portion with the engaged portion.

[0015] In one or more embodiments, for example, the penultimate engagement portion is last closer to the rotational center axis of the wheel than the engagement portion of, whereby the outer region of the penultimate engagement portion is last farther from the driver than the engagement portion of. This results in shallower meshing of the penultimate engagement portion with the engaged portion.

[0016] In one or more embodiments, for example, the plurality of engaged portions of the driver include a final engaged portion that lastly engages with the wheel when moving in the reverse driving direction. For example, the driver is slidably supported by a guide surface on the opposite side of the wheel. For example, in an abnormal situation where the final engaged portion engages with the penultimate engagement portion, a relief portion that allows the driver to move away from the wheel is formed on the guide surface. Accordingly, when the driver reaches the relief portion, the engagement of the penultimate engagement portion with the final engaged portion becomes shallower. This corrects misalignment of meshing of the wheel with the engaged portion of the driver.

[0017] In one or more embodiments, for example, the guide surface has a main guide surface extending along the driver. For example, the relief portion is adjacent to the main guide surface in the reverse driving direction relative to a standby position of the driver where the final engaged portion of the driver engages with the final engagement portion of the wheel, and is recessed in a direction farther from the wheel than the main guide surface. Accordingly, when the driver moves beyond the standby position in the reverse driving direction during an abnormality, the driver moves from the main guide surface to the relief portion and thereby separates from the wheel. This disengages the meshing of the penultimate engagement portion with the final engaged portion and corrects the meshing misalignment.

[0018] In one or more embodiments, for example, the guide surface has an inclined surface that is inclined with respect to the main guide surface and connects the main guide surface and the relief portion. Therefore, the movement of the driver between the main guide surface and the relief portion is made smooth by the inclined surface of the guide surface.

[0019] In one or more embodiments, for example, the driver has a tip that can enter the relief section. The tip of the driver has, for example, an inclined surface that is inclined toward the guide surface side with respect to the direction of movement of the driver. Thus, the movement of the driver between the main guide surface and the relief section is made smooth by the inclined surface of the driver.

[0020] In one or more embodiments, for example, in the event of an abnormality, the driver reaches the relief portion, causing the final pre-engaging portion to disengage from the final engaged portion, thereby displacing the driver from the relief portion in the driving direction and returning it to a standby position where the final engaged portion of the driver engages with the last engaging portion of the wheel. Thus, in the standby position, the driver slides against the main guide surface, maintaining a deep engagement state between the final engaged portion of the driver and the last engaging portion of the wheel.

[0021] In one or more embodiments, for example, multiple engaged portions of a driver include a final engaged portion that last engages with the wheel when moving in the opposite direction of driving. For example, the final engaged portion protrudes further toward the wheel than the other engaged portions. Thus, the engagement of the wheel with the final engaged portion is deepened. This ensures that a normal, misaligned engagement is achieved in the standby position. [Examples]

[0022] Next, one embodiment of the present disclosure will be described with reference to Figures 1 to 16. As an example of the driving tool 1, a gas spring type driving tool is shown that utilizes the gas pressure in the pressure accumulator chamber above the cylinder as thrust for driving in the driving tool N. In the following description, the driving direction of the driving tool N will be considered downward, and the opposite direction will be considered upward. The user of the driving tool 1 is generally located to the left of the driving tool 1 in Figure 1. The side in front of the user will be considered the rear direction (user side), and the side opposite the front will be considered the front direction. The left and right directions will be based on the user.

[0023] As shown in Figures 1 and 3, the driving tool 1 has a tool body 10. The tool body 10 has a configuration in which a cylinder 12 is housed in a generally cylindrical body housing 11. A piston 13 is housed inside the cylinder 12 so as to be able to reciprocate up and down. The upper part of the cylinder 12 above the piston 13 is connected to a pressure accumulator 14. Compressed gas, such as air, is sealed inside the pressure accumulator 14. The gas pressure in the pressure accumulator 14 acts as a thrust that moves the upper surface of the piston 13 downward.

[0024] As shown in Figure 3, the lower part of the cylinder 12 is connected to the driving passage 2a of the driving nose section 2, which is located at the bottom of the tool body 10. The driving nose section 2 is connected to a magazine 8 loaded with multiple driving tools N (see Figure 1). The driving tools N are supplied one by one from the magazine 8 into the driving passage 2a, extending vertically. A contact arm 3, which can slide vertically, is provided at the bottom of the driving nose section 2. The contact arm 3 moves upward by coming into contact with the material to be driven W.

[0025] As shown in Figure 3, a vertically elongated driver 15 is coupled to the lower surface of the piston 13. The lower part of the driver 15 enters the driving passage 2a. The driver 15 moves downward within the driving passage 2a due to the gas pressure of the accumulator chamber 14 acting on the upper surface of the piston 13. The lower end of the driver 15 strikes a single driving tool N supplied into the driving passage 2a. The struck driving tool N is ejected from the ejection port 2b of the driving nose section 2. The ejected driving tool N is driven into the material W to be driven. A lower end damper 17 is positioned at the bottom of the cylinder 12 to absorb the impact at the lower moving end of the piston 13.

[0026] As shown in Figure 3, the right side of the driver 15 is provided with a plurality of engaging parts L. In this embodiment, each engaging part L is provided with a rack-tooth shaped protrusion that extends toward the wheel 22. In this embodiment, 10 engaging parts L1 to L10 are arranged at regular intervals in the longitudinal direction (vertical direction) of the driver 15. Each engaging part L is formed in a rack-tooth shape and is provided in a state that protrudes toward the right. Hereinafter, the 10 engaging parts L1 to L10 will also be referred to as the 1st engaging part L1, 2nd engaging part L2, 3rd engaging part L3, 4th engaging part L4, 5th engaging part L5, 6th engaging part L6, 7th engaging part L7, 8th engaging part L8, 9th engaging part L9, and 10th engaging part L10, in order from top to bottom as needed. The engaging parts P provided by the lift mechanism 20, which will be described later, are engaged with the 10 engaging parts L.

[0027] As shown in Figure 1, a grip 4 for the user to hold is provided at the rear of the tool body 10. A trigger 5, operated by the user pulling it with their fingertips, is provided on the front lower surface of the grip 4. The trigger 5 is activated by pressing the contact arm 3 against the material to be driven W and moving it upward relative to the driving nose portion 2. A battery mounting portion 6 is provided at the rear of the grip 4. A battery pack 7 can be detachably attached to the rear surface of the battery mounting portion 6. The battery pack 7 can be removed from the battery mounting portion 6 and repeatedly charged with a separately prepared charger for reuse. The battery pack 7 can be used as a power source for other power tools. The battery pack 7 operates as a power source that supplies power to the drive unit 30, which will be described later.

[0028] As shown in Figure 3, a lift mechanism 20 is connected to the right side of the driving nose section 2. The lift mechanism 20 has the function of returning the piston 13 and driver 15 upward together after impact. When the piston 13 is returned upward by the lift mechanism 20, the gas pressure in the accumulator chamber 14 is increased.

[0029] As shown in Figure 1, a drive unit 30 for operating the lift mechanism 20 is mounted side by side at the rear of the lift mechanism 20. The lift mechanism 20 and the drive unit 30 are housed in a substantially cylindrical drive unit case 11a. The drive unit case 11a connects the lower part of the main housing 11 and the lower part of the battery mounting section 6. The drive unit case 11a is provided integrally with the main housing 11.

[0030] As shown in Figure 2, the drive unit 30 has an electric motor 31 as a drive source. The electric motor 31 is housed in a position where the axis of the output shaft 32 (motor axis J) is aligned along the front-rear direction, which is perpendicular to the driving direction (the direction perpendicular to the plane of the paper in Figure 2). The electric motor 31 is started by pulling the trigger 5, using the power from the battery pack 7 as its power source.

[0031] As shown in Figure 2, the output shaft 32 of the electric motor 31 is rotatably supported in the drive unit case 11a via bearings 33 and 34. The front of the output shaft 32 is connected to the reduction gear section 40. The reduction gear section 40 is supported on the inner circumference side of a substantially cylindrical gear case 40a housed in the drive unit case 11a. The reduction gear section 40 uses three rows of planetary gear trains 41, 42, and 43. The three rows of planetary gear trains 41, 42, and 43 are coaxial with each other and arranged coaxially with the motor axis J. The rotational output of the electric motor 31 is reduced by the reduction gear section 40, which includes the three rows of planetary gear trains 41, 42, and 43, and output to the lift mechanism 20 in front.

[0032] As shown in Figure 2, the lift mechanism 20 has a rotating shaft 21 connected to a reduction gear section 40 and a wheel 22 supported by the rotating shaft 21. The lift mechanism 20 is housed in a substantially cylindrical mechanism case 29 which is housed in the drive unit case 11a. The rotation axis of the rotating shaft 21 coincides with the motor axis J. The front of the mechanism case 29 is closed by a cover 29a. The front end of the rotating shaft 21 is rotatably supported by a bearing 26 held in the mechanism case 29 via the cover 29a. The rear end of the rotating shaft 21 is coupled to the final stage carrier 43a of the reduction gear section 40. The final stage carrier 43a of the reduction gear section 40 is rotatably supported by the mechanism case 29 via a bearing 27 provided on its outer circumference. When the electric motor 31 is started, the rotating shaft 21 and wheel 22 of the lift mechanism 20 rotate together in the direction of arrow R shown in Figure 3 (counterclockwise in Figure 3). As the wheel 22 rotates in the direction of arrow R, the driver 15 is lifted upward.

[0033] The wheel 22 has a plurality of engagement parts P that sequentially engage with the engaged part L of the driver 15. The plurality of engagement parts P are arranged at regular intervals along the outer edge of the wheel 22. In this embodiment, for example, 10 engagement parts P (P1 to P10) are provided. A cylindrical shaft member (pin) is used for each engagement part P. Hereinafter, the 10 engagement parts P will also be referred to as the first engagement part P1, second engagement part P2, third engagement part P3, fourth engagement part P4, fifth engagement part P5, sixth engagement part P6, seventh engagement part P7, eighth engagement part P8, ninth engagement part P9, and tenth engagement part P10, in order from the leading side in the rotational direction of the arrow R of the wheel 22.

[0034] Figure 4 shows the state immediately after the driver 15 reaches its lower moving end and the driving tool N is driven in. When the driver 15 reaches its lower moving end, normal driving is performed. Normal driving is performed by the piston 13 moving downwards due to the gas pressure in the pressure accumulator chamber 14 until it contacts the lower moving end damper 17. After the driver 15 reaches its lower moving end, the wheel 22 continues to rotate in the direction of arrow R, returning it upwards. As shown in Figure 4, the lift of the driver 15 begins due to normal engagement, where the first engaging portion P1 of the wheel 22 engages with the lower surface of the first engaged portion L1 of the driver 15. Normal engagement is indicated when the number assigned to the symbol P of the engaging portion P matches the number assigned to the symbol L of the engaged portion L. If they do not match, it is an abnormal engagement state where the engagement is misaligned.

[0035] With the first engaging portion P1 engaged with the first engaged portion L1, the wheel 22 continues to rotate in the direction of arrow R. As a result, the second engaging portion P2 engages with the lower surface of the second engaged portion L2, and then the third engaging portion P3 engages with the lower surface of the third engaged portion L3. Subsequently, as the wheel 22 rotates, the fourth engaging portion P4, fifth engaging portion P5, sixth engaging portion P6, seventh engaging portion P7, eighth engaging portion P8, ninth engaging portion P9, and tenth engaging portion P10 engage with the lower surfaces of the fourth engaged portion L4, fifth engaged portion L5, sixth engaged portion L6, seventh engaged portion L7, eighth engaged portion L8, ninth engaged portion L9, and tenth engaged portion L10 in sequence, causing the driver 15 and piston 13 to move upward.

[0036] As shown in Figure 5, when the final engaging portion P10 engages with the lower surface of the final engaged portion L10 through normal meshing, the piston 13 and driver 15 move to the standby position described above. For example, by appropriately controlling the start time of the electric motor 31, the electric motor 31 is stopped when the piston 13 and driver 15 reach the standby position. This completes the series of driving operations. The standby position of the piston 13 and driver 15 is set below the upper moving end position. In one driving operation, the driver 15 is moved upward from the standby position to the upper moving end position, and then moved downward by gas pressure to perform the driving operation.

[0037] As shown in Figure 6, if the driving tool N is driven into a hard part of the material to be driven W, for example, insufficient driving of the driving tool N may occur. In this case, the piston 13 and driver 15 will not reach the lower moving end and will stop at a position higher. Also, if the driving tool N becomes jammed, the piston 13 and driver 15 will stop before reaching the lower moving end. Figure 6 shows the state in which the piston 13 has stopped before reaching the lower moving end damper 17. The rotation state of the wheel 22 continues even when the driver 15 is stopped midway. As a result, a misalignment (abnormal meshing) occurs in the relative position of the engaging part P with respect to the engaged part L of the driver 15. Figure 6 shows the state in which the first engaging part P1 is engaged with the lower surface of the second engaged part L2 instead of the first engaged part L1. As shown in Figure 4, in normal meshing, the first engaging part P1 is engaged with the lower surface of the first engaged part L1 when the lift starts. Figure 6 shows an abnormal meshing state in which the meshing is shifted by one position.

[0038] In an abnormal meshing state where the meshing is misaligned by one position, the wheel 22 rotates in the direction of arrow R, lifting the driver 15. As a result, as shown in Figure 7, the ninth engaging portion P9 engages with the lower surface of the tenth engaged portion L10, causing the piston 13 and driver 15 to move upward to their upper end. When the electric motor 31 stops and the series of driving operations are completed while the ninth engaging portion P9 of the wheel 22 is engaged with the lower surface of the tenth engaged portion L10 of the driver 15, the tenth engaged portion L10 of the driver 15, which moves downward during the next driving operation, may interfere with the tenth engaging portion P10, potentially causing the driving operation to become unstable. In this embodiment, this problem is resolved.

[0039] As shown in Figure 8, the first to tenth engaging parts P1 to P10 are arranged on the same circumference C0 (for convenience, the arc of radius C0 is referred to as "circumference C0"), but the diameter d2 of the ninth engaging part P9 is smaller than the diameter d1 of the other engaging parts P (the first to eighth engaging parts P1 to P8 and the tenth engaging part P10). Therefore, the outer region E of the ninth engaging part P9 (the edge region located on the driver 15 side in a direction perpendicular to the driving direction) is located further from the driver 15 than the outer region E of the other engaging parts P. Note that the outer region E of each engaging part P can be considered as the radial outer edge of the wheel 22.

[0040] Since the outer region E of the ninth engaging portion P9 is located further from the driver 15 than the other engaging portions P, the engagement of the ninth engaging portion P9 with the engaged portion L is shallower than that of the other engaging portions P. Therefore, as described above, when the piston 13 is moved upward beyond the standby position to near the upper end while in an abnormal engagement state, the engagement of the ninth engaging portion P9 with the tenth engaged portion L10 disengages in a short time. Once the piston 13 has been moved upward to near the upper end, the disengagement of the ninth engaging portion P9 with the tenth engaged portion L10 causes the piston 13 and driver 15 to move downward to the standby position due to the gas pressure in the accumulator chamber 14. As a result, the tenth engaging portion P10 engages with the lower surface of the tenth engaged portion L10, correcting the misalignment of the engagement. With the abnormal engagement corrected, the driver 15 is returned to the standby position shown in Figure 5.

[0041] As shown in Figure 9, in this embodiment, the tooth height (projection dimension toward the wheel 22) of the 10th engaged portion L10 is greater by a distance h than the tooth heights of the other engaged portions L (1st to 9th engaged portions L1 to L9). As a result, the engagement between the 10th engaged portion P10 and the 10th engaged portion L10 in the standby position shown in Figure 5 is deepened by a distance h, ensuring that normal engagement is reliably achieved.

[0042] In the embodiment configured as described above, the ninth engaging portion P9 of the wheel 22 has a smaller diameter (d1>d2) than the other engaging portions P, so the outer region E of the ninth engaging portion P9 is further from the driver 15 than the other engaging portions P. Therefore, when the driver 15 is moved in the opposite direction to the driving-in direction, the engagement (meshing) of the ninth engaging portion P9 with the engaged portion L of the driver 15 becomes shallower than that of the other engaging portions P. As the wheel 22 rotates in a state of shallow engagement, the engagement of the ninth engaging portion P9 with the engaged portion L disengages. This prevents the ninth engaging portion P9 from being engaged with the engaged portion L of the driver 15 while the wheel is stopped, and corrects the misalignment of the engagement of the wheel 22 with the engaged portion L of the driver 15 in the standby position. The next driving-in operation is stabilized as the misalignment of the engagement is corrected.

[0043] Modifications can be made to the first embodiment described above. For example, although a configuration was illustrated in which the ninth engaging portion P9 has a smaller diameter (d1>d2) than the other engaging portions P, thereby positioning the outer region E of the ninth engaging portion P9 further from the driver 15 than the outer region E of the other engaging portions P, and thus reducing the engagement with the engaged portion L, similar effects can be obtained by changing the position of the ninth engaging portion P11.

[0044] Figures 10-12 show the ninth engaging portion P11 according to the second embodiment. Members and components that are the same as in the first embodiment are given the same reference numerals and their explanations are omitted. In the second embodiment, the ninth engaging portion P11 is used in place of the ninth engaging portion P9 of the first embodiment. In the second embodiment, the first to eighth engaging portions P1-P8, the tenth engaging portion P10, and the ninth engaging portion P11 all use shaft members with the same diameter d1. In the second embodiment, normal engagement occurs when the ninth engaging portion P11 engages with the lower surface of the ninth engaged portion L9. For the first to eighth engaging portions P8 and the tenth engaging portion P10, the normal engagement state occurs when the number assigned to the reference numeral P of the engaging portion P matches the number assigned to the reference numeral L of the engaged portion L, similar to the first embodiment. If they do not match, it is an abnormal engagement state with misaligned engagement.

[0045] As shown in Figure 12, the ninth engaging portion P11 according to the second embodiment is positioned on the circumference C1 (for convenience, the arc of radius C1 is referred to as "circumference C1"). The first to eighth engaging portions P1 to P8 and the tenth engaging portion P10 are positioned on the same circumference C0 as in the first embodiment. Circumference C1 is smaller in diameter than circumference C0. Therefore, the ninth engaging portion P11 is positioned closer to the rotational axis of the wheel 22 (the rotational axis of the rotation shaft 21) than the other engaging portions P. As a result, the outer region E of the ninth engaging portion P11 is further from the driver 15 than the other engaging portions P. Similar to the first embodiment, the distance of the outer region E from the driver 15 results in a shallower engagement of the ninth engaging portion P11 with the engaged portion L.

[0046] As shown in Figure 10, if the driver 15 is moved upward beyond the standby position to near the upper end while the engagement is misaligned, the engagement of the ninth engaging part P11 with the tenth engaged part L10 is shallow, causing the wheel 22 to rotate and disengage the ninth engaging part P11 from the tenth engaged part L10. As a result, as shown in Figure 11, the driver 15 moves downward and the wheel 22 stops in a normal engagement state where the tenth engaging part P10 engages with the lower surface of the tenth engaged part L10. Therefore, the driver 15 stops in the standby position with the misalignment corrected. This stabilizes the next driving operation. In the second embodiment as well, the tenth engaged part L10, which is the last to engage, has a protrusion distance of distance h greater than the other engaged parts L. As a result, the engagement of the tenth engaging part P10 with the tenth engaged part L10 is deeper, and the driver 15 is securely held in the standby position.

[0047] In the first and second embodiments, a means is used to correct the misalignment of the engagement between the engagement portion P of the wheel 22 and the engaged portion L of the driver 15 by positioning the outer region E of the ninth engagement portion P9, P11 further away from the driver 15 than the outer region E of the other engagement portions P. Alternatively, the same effect can be obtained by the third embodiment described below.

[0048] figure 13 ~ 16 A third embodiment is shown. In the third embodiment, the position of the driver 15 is changed, which reduces the engagement between the engaging portion P of the wheel 22 and the engaged portion L of the driver 15, thereby correcting the abnormal engagement. In the third embodiment, an unprecedented design has been made to the guide surface 2c of the driver 15.

[0049] The driving passage 2a is provided with a guide surface 2c that guides the vertical movement of the driver 15. The guide surface 2c extends vertically on the side of the driver 15 opposite to the wheel 22. Primarily when the driver 15 is lifted, the left side of the driver 15, opposite to the engaged portion L, slides against the guide surface 2c, thereby guiding the driver 15 upward.

[0050] As the driver 15 engages with each engagement portion P of the wheel 22, a force acts on it in a direction that presses it against the guide surface 2c. Therefore, the driver 15 is guided upward while being pressed against the guide surface 2c.

[0051] As shown in Figure 14, a lower relief section 2d is provided in the upper region of the guide surface 2c. The relief section 2d is recessed by a depth D in the direction away from the wheel 22 relative to the main guide surface (guide surface 2c excluding the relief section 2d). The relief section 2d extends adjacent to the main guide surface in the direction opposite to the driving direction (upward).

[0052] The guide surface 2c has an inclined surface 2e that is inclined with respect to the main guide surface and connects the main guide surface and the relief portion 2d. The driver 15 has a tip (lower end) that can enter the relief portion 2d. An inclined surface 15a is provided on the tip of the driver 15 on the side of the guide surface 2c, which is inclined with respect to the direction of movement of the driver 15.

[0053] In the third embodiment, all engaging parts P of the wheel 22 (first to eighth engaging parts P1 to P8, ninth engaging part P12, and tenth engaging part P10) are arranged on the same circumference C0 and have the same diameter d1. In the third embodiment, normal engagement occurs when the ninth engaging part P12 engages with the lower surface of the ninth engaged part L9. For the first to eighth engaging parts P8 and the tenth engaging part P10, as in the first and second embodiments, normal engagement occurs when the numbers assigned to the designation P of the engaging part P match the numbers assigned to the designation L of the engaged part L. If they do not match, it is an abnormal engagement state where the engagement is misaligned.

[0054] According to the third embodiment, as in the first and second embodiments, the driver 15 is lifted while the engagement of the engaging portion P of the wheel 22 and the engaged portion L of the driver 15 are misaligned, resulting in an abnormal engagement state. This causes the ninth engaging portion P12 to engage with the lower surface of the tenth engaged portion L10. As the ninth engaging portion P12 engages with the tenth engaged portion L10, the wheel 22 rotates in the direction of arrow R, causing the piston 13 and driver 15 to be lifted beyond the standby position to near the upper moving end.

[0055] As shown in Figures 13 and 14, when the driver 15 is lifted to near the upper moving end in an abnormal engagement state, the tip of the driver 15 enters the relief portion 2d due to the force from the ninth engaging portion P12. The relief portion 2d is provided in the area into which the tip of the driver 15 enters when the ninth engaging portion P12 engages with the engaged portion L. As a result, as shown by arrow A in Figure 14, the tip of the driver 15 is displaced by the depth D of the relief portion 2d in the direction away from the wheel 22 (to the left in Figures 13 and 14). This displacement of the driver 15 away from the wheel 22 causes the engagement of the ninth engaging portion P12 with the tenth engaged portion to become shallower and disengage.

[0056] When the engagement of the 9th engaging portion P12 with the 10th engaged portion L10 is disengaged, the piston 13 and driver 15, which were lifted to near the upper end, move slightly downward as shown by arrow B in Figure 14. As shown in Figures 15 and 16, when the driver 15 moves downward, its tip comes out of the relief portion 2d and returns to the guide surface 2c (main guide surface). An inclined surface 2e is provided between the relief portion 2d and the main guide surface. An inclined surface 15a is also provided at the tip corner of the driver 15 on the relief portion 2d side. Due to the sliding contact between the inclined surface 2e and the inclined surface 15a, the tip of the driver 15 is smoothly displaced downward from within the relief portion 2d and returned to the main guide surface.

[0057] When the ninth engaging portion P12 disengages and the driver 15 moves downward, the tenth engaging portion P10 engages with the lower surface of the tenth engaged portion L10. This corrects the abnormal engagement and stops the piston 13 and driver 15 in the standby position. In the standby position, the left side of the driver 15 (the side opposite to the wheel 22) disengages from the relief portion 2d and returns to a state where it slides against the guide surface 2c (main guide surface). This returns the tip of the driver 15 to the wheel 22 side, ensuring a secure engagement of the tenth engaging portion P10 with the tenth engaged portion L10. In the third embodiment as well, the tenth engaged portion L10, which is the last to engage, has a protrusion distance h greater than the other engaged portions L. This deepens the engagement of the tenth engaging portion P10 with the tenth engaged portion L10, ensuring that the driver 15 is securely held in the standby position.

[0058] Thus, in this third embodiment as well, abnormal engagement is automatically corrected when the driver 15 is lifted. This ensures that a normal engagement state is achieved between the engaging portion P of the wheel 22 and the engaged portion L of the driver 15 in the standby position, thereby stabilizing the next driving operation.

[0059] Further modifications can be made to the embodiments described above. For example, the first and second embodiments may be combined. Alternatively, the driver displacement mechanism (relief section 2d) of the third embodiment may be combined with either the first or second embodiment.

[0060] Although an example has been given in which a shaft member is used for the engagement portion P of the wheel 22, this may be changed to a toothed protrusion. The same effect can be obtained by reducing the amount of protrusion of the toothed protrusion for the engagement portion immediately preceding the final engagement portion, or by displacing it toward the inner circumference. When a toothed protrusion is used for the engagement portion of the wheel, an shaft member may be used for the engaged portion L of the driver 15.

[0061] The number of engaging parts P of the wheel 22 and the engaged parts L of the driver 15 can be increased or decreased, and the example meshing correction structure can be applied accordingly.

[0062] The driving tool 1 in the first to third embodiments is an example of a driving tool in one or other aspects of the present disclosure. The piston 13 in the first to third embodiments is an example of a piston in one or other aspects of the present disclosure. The driver 15 in the first to third embodiments is an example of a driver in one or other aspects of the present disclosure. The wheel 22 in the first to third embodiments is an example of a wheel in one or other aspects of the present disclosure. The engaged portion L in the first to third embodiments is an example of an engaged portion in one or other aspects of the present disclosure. The engaging portion P in the first to third embodiments is an example of an engaging portion in one or other aspects of the present disclosure.

[0063] The outer region E in the first and second embodiments is an example of an outer region in one aspect of the present disclosure. The tenth engaging portion P10 in the first to third embodiments is an example of a final engaging portion in one or another aspect of the present disclosure. The ninth engaging portion P9 in the first embodiment, the ninth engaging portion P11 in the second embodiment, and the ninth engaging portion P12 in the third embodiment are examples of final pre-engaging portions in one or another aspect of the present disclosure.

[0064] The guide surface 2c of the third embodiment is an example of a guide surface in other aspects of the present disclosure. The relief portion 2d of the third embodiment is an example of a relief portion in other aspects of the present disclosure. [Explanation of Symbols]

[0065] W... material to be driven in N... driving tool 1… Driving tool 2... Nose section for driving 2a…Injection passage, 2b…Ejection port, 2c…Guide surface, 2d…Relief section, 2e…Inclined surface 3… Contact Arm 4…Grip 5...Trigger 6…Battery mounting section 7…Battery pack 10...Tool body 11…Main housing 11a... Drive unit case 12... Cylinder 13... Piston 14...Accumulation chamber 15…Driver L…Engaged part L1...first engaged part, L2...second engaged part, L3...third engaged part, L4...fourth engaged part L5...5th engaged part, L6...6th engaged part, L7...7th engaged part, L8...8th engaged part L9...9th engaged part, L10...10th engaged part (final engaged part) 17... Lower end damper 20…Lift mechanism 21…Rotation axis 22... Wheels P…Engagement part P1...first engagement part, P2...second engagement part, P3...third engagement part, P4...fourth engagement part P5...5th engaging part, P6...6th engaging part, P7...7th engaging part, P8...8th engaging part P9...9th engagement part (final engagement part), P10...10th engagement part (final engagement part) P11...9th engaging portion (2nd embodiment), P12...9th engaging portion (3rd embodiment) E...Outer area h... Distance indicating the difference in tooth height between the 10th engaged part and the other engaged parts. 26, 27… Bearings 29… Mechanism case 29a...Lid part 30…Drive unit 31… Electric motor J...Motor axis 32…Output shaft 33, 34… bearings 40...Reduction gear section 40a... Gear case 41-43...Planetary Gear Row 43a... Final stage carrier

Claims

1. It is a driving tool, A piston that moves in the direction of insertion by gas pressure, A driver provided on the piston and moving integrally with the piston to strike the driving tool, The driver has a wheel that moves it in the opposite direction of driving it in, The driver comprises a plurality of engaging portions arranged along the driving direction, The wheel comprises a plurality of engaging portions that sequentially engage with the engaged portion of the driver when the wheel rotates to move the driver in the opposite direction of driving, the plurality of engaging portions are located on the same circumference and have an outer region that is located on the driver side in a direction perpendicular to the driving direction when engaging with the driver, A driving tool in which, when engaging with the driver, the final pre-engaging portion that engages with the driver just before the last engaging portion that moves the driver in the opposite driving direction has a smaller diameter than all other engaging portions including the last engaging portion, and all other engaging portions including the last engaging portion have the same diameter, the outer region of the last engaging portion is located further from the driver than the outer region of all other engaging portions including the last engaging portion.

2. It is a driving tool, A piston that moves in the direction of insertion by gas pressure, A driver provided on the piston and moving integrally with the piston to strike the driving tool, The driver has a wheel that moves it in the opposite direction of driving it in, The driver comprises a plurality of engaging portions arranged along the driving direction, The wheel comprises a plurality of engaging portions that sequentially engage with the engaged portion of the driver when the wheel rotates to move the driver in the opposite direction of driving, the plurality of engaging portions having the same diameter, and having an outer region located on the driver side in a direction perpendicular to the driving direction when engaging with the driver. A driving tool in which a final pre-engaging portion that engages with the driver one engagement portion before the last engaging portion that moves the driver in the counter-driving direction is closer to the rotational axis of the wheel than all other engaging portions including the last engaging portion, and when engaging with the driver by all other engaging portions including the last engaging portion being located on the same circumference, the outer region of the final engaging portion is located further from the driver than the outer region of all other engaging portions including the last engaging portion.

3. A driving tool according to claim 1 or 2, The plurality of engaged portions of the driver include a final engaged portion that last engages with the wheel when moving in the opposite direction of driving in, The driver is slidably supported by a guide surface on the opposite side of the wheel, A driving tool having a relief portion formed on its guide surface that allows the driver to separate from the wheel in the event of an abnormality where the final engaged portion engages with the final pre-engaged portion.

4. It is a driving tool, A piston that moves in the direction of insertion by gas pressure, A driver provided on the piston and moving integrally with the piston to strike the driving tool, A wheel that moves the driver in the opposite direction of driving, The driver has a guide surface that allows it to slide against the wheel, The driver comprises a plurality of engaging portions arranged along the driving direction, The plurality of engaged portions include a final engaged portion that last engages with the wheel when moving in the opposite direction of driving in, The wheel is provided with a plurality of engaging portions that sequentially engage with the engaged portion of the driver when it rotates to move the driver in the opposite direction of driving in, The plurality of engagement portions include a final pre-engagement portion that engages with the driver one before the last engagement portion that moves the driver in the opposite direction of driving, A driving tool having a relief portion formed on its guide surface that allows the driver to separate from the wheel in the event of an abnormality where the final engaged portion engages with the final pre-engaged portion.

5. The driving tool according to claim 4, The guide surface has a main guide surface that extends along the driver, The relief portion is a driving tool that is adjacent to the main guide surface in the opposite direction to the driving direction with respect to the waiting position of the driver in which the final engaged portion of the driver engages with the last engaged portion of the wheel, and is recessed in a direction away from the wheel than the main guide surface.

6. The driving tool according to claim 5, The guide surface is a driving tool having an inclined surface that is inclined with respect to the main guide surface and connects the main guide surface and the relief portion.

7. The driving tool according to claim 5, The driver is a driving tool having a tip that can enter the relief portion, and the tip has an inclined surface that is inclined toward the guide surface side with respect to the direction of movement of the driver.

8. The driving tool according to claim 4, In the event of the aforementioned abnormality, the driver reaches the relief portion, causing the final pre-engaging portion to disengage from the final engaged portion, thereby displacing the driver from the relief portion in the driving direction and returning the driver to a standby position where the final engaged portion of the driver engages with the last engaging portion of the wheel.

9. A driving tool according to claim 1, 2, or 5, The plurality of engaged portions of the driver include a final engaged portion that last engages with the wheel when moving in the opposite direction of driving in, A driving tool in which the final engaged portion protrudes more toward the wheel than the other engaged portions.

Images