Impact driving tool

Abstract

To provide an impact driving tool that can suppress interference between a staple guide and staples when installing U-shaped staples to a main magazine.SOLUTION: An impact driving tool 1 that ejects U-shaped staples 60 has: a tool body equipped with a driver which impacts staples 60; and a main magazine 31 which extends from the tool body and houses a plurality of staples 60. The impact driving tool 1 has a sub magazine 33 to which a pusher 34 which pushes the plurality of staples 60 toward the tool body in the main magazine 31, and a staple guide 35 which is inserted between a pair of leg parts 60b of the staple 60 in the main magazine 31 are installed. The impact driving tool 1 has: a guiding mechanism 40 which guides the sub magazine 33 from an opening position for the main magazine 31 to a closing position toward the tool body, and guides the sub magazine 33 to the opposite direction of a driving direction while moving the sub magazine from the opening position to the closing position.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to a driving tool for driving a driving tool such as a staple into wood or the like. [Background technology]

[0002] Patent Document 1 discloses an air-powered driving tool that ejects a driving tool using the gas pressure of supplied compressed air as a thrust. A staple is used as the driving tool. The staple is U-shaped with a pair of legs extending from both ends of a linear head in directions that are approximately perpendicular to each other. The driving tool has a driver that strikes the staples and a driving passage through which the driver moves. Staples are sequentially supplied to the driving passage in a position in which the pair of legs are disposed on the driving direction side and the head is disposed on the opposite driving direction side. The driver strikes the head of the staple supplied to the driving passage in the driving direction. The struck staple is ejected from the ejection port into the material to be driven in a position in which the pair of legs are facing the material to be driven.

[0003] The driving tool is provided with a magazine that stores a plurality of staples. The magazine is provided with a pusher that biases the plurality of staples toward the driving passage. The magazine has a substantially box-shaped main magazine that can store a plurality of staples. The magazine has a staple guide that enters between a pair of legs of the staples in the main magazine. The staple guide is connected to the pusher and configured as a sub-magazine. The main magazine has an opening on the driving direction side and a back surface at the back part on the side opposite to the driving direction. The plurality of staples connected to each other are stored in the main magazine with the heads of the staples lined up along the back surface. The heads of the staples are sandwiched between the back surface of the main magazine and an end face of the staple guide on the side opposite to the driving direction. The sub-magazine is provided integrally with a magazine end that opens and closes the opening of the main magazine. The magazine end slides parallel to the direction in which the staples are fed by the pusher. The staple guide also slides together with the magazine end.

[0004] When staples are loaded into the main magazine, the staples may tilt in the main magazine. For example, when the number of staples connected to each other is small, the staples are likely to tilt from the head to the foot toward the driving passage. When the staples tilt, the heads of the staples enter an area where the staple guide can slide. The staple guide is provided so that the gap between the staples and the heads of the staples is as small as possible in order to suppress rattling of the staples in the main magazine. Therefore, even a slight tilt of the staples causes interference between the staple guide and the heads of the staples. As a result, the magazine end cannot be closed, and measures such as correcting the tilt of the staples are required. However, when the number of staples connected to each other is small, it is difficult to maintain a state in which the legs are not tilted toward the driving passage. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5125844 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, there is a need for a driving tool that can suppress interference between the staple guide and the staple when loading U-shaped staples into the main magazine. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, a driving tool ejects a U-shaped staple having a head portion connecting a pair of legs. The driving tool has a tool body having a driver for striking the staple. The driving tool has a main magazine extending from the tool body and housing a plurality of staples. The driving tool has a pusher for pushing the plurality of staples in the main magazine toward the tool body. The driving tool has a staple guide inserted between a pair of legs of the staples in the main magazine. The driving tool has a sub-magazine to which the pusher and the staple guide are attached. The driving tool has a guide mechanism for guiding the sub-magazine from an open position relative to the main magazine to a closed position toward the tool body and for guiding the sub-magazine in a direction opposite to the driving direction while moving the sub-magazine from the open position to the closed position.

[0008] Therefore, the staple guide is relatively located in the driving direction when the sub-magazine is away from the closed position than when it is close to the closed position. Therefore, when the sub-magazine is away from the closed position, a gap can be provided between the tip of the staple guide on the side opposite the driving direction and the heads of the staples in the main magazine. Therefore, even if the staples are slightly inclined in the feed direction, interference between the heads of the staples and the staple guide can be suppressed. This allows the guide mechanism to move the staple guide toward the closed position so as not to interfere with the staples. When the sub-magazine is close to the closed position, the tip of the staple guide on the side opposite the driving direction and the heads of the staples in the main magazine come close to each other. Therefore, the staple guide can suppress rattling of the staples in the main magazine by moving the sub-magazine to the closed position. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a right side view of a driving tool according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 13 is a front view of the magazine with the sub-magazine in the closed position. [Figure 7] FIG. 13 is a left side view of a portion of the magazine with the sub-magazine in a closed position. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII in FIG. 6. [Figure 9] FIG. 13 is a front view of the magazine with the sub-magazine in the open position. [Figure 10] FIG. 13 is a left side view of a portion of the magazine with the sub-magazine in an open position. [Figure 11] 10 is a cross-sectional view taken along line XI-XI in FIG. 9. [Figure 12] 10 is a longitudinal sectional view corresponding to line XI-XI in FIG. 9 in a state in which a plurality of staples are further loaded. [Figure 13] 13 is a vertical cross-sectional view corresponding to line XI-XI in FIG. 9 when the sub-magazine has been moved from the state in FIG. 12 to a closed position. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] According to another feature of the present disclosure, the guide mechanism has a rail provided on one of the two components, the main magazine and the sub-magazine. The guide mechanism has a rail engagement portion provided on the other of the two components and slidably engaged with the rail. Therefore, the rail and the rail engagement portion can reliably guide the movement of the sub-magazine relative to the main magazine. Therefore, when the sub-magazine is in the open position, the staple guide can be reliably guided in a position away from the heads of the staples in the driving direction. When the sub-magazine is in the closed position, the staple guide can be reliably guided so as to approach the heads of the staples in the opposite driving direction. This makes it possible to reliably suppress interference between the staple guide and the heads of the staples when closing the sub-magazine, while also suppressing rattling of the staples in the main magazine.

[0011] According to another feature of the present disclosure, the rail includes a first rail extending linearly toward the tool body, and a second rail bending from the tip of the first rail in a direction opposite to the driving direction. Therefore, when the rail engaging portion is engaged with the first rail and the sub-magazine is away from the closed position, the staple guide is maintained not to move in the direction opposite to the driving direction. When the sub-magazine is brought close to the closed position and the rail engaging portion is engaged with the second rail, the staple guide can be moved in the direction opposite to the driving direction. Therefore, interference between the staple guide and the head of the staple can be suppressed until the sub-magazine is brought close to the vicinity of the closed position. This makes it possible to suppress interference between the staple guide and the head of the staple, for example, even when the number of connected staples is small and the staple furthest from the tool body is relatively close to the tool body.

[0012] According to another feature of the present disclosure, the rail includes a third rail that bends from a tip of the second rail toward the tool body and extends parallel to the first rail. Therefore, when the rail engaging portion is engaged with the third rail, the staple guide can be moved parallel to the feeding direction of the staples. The staple guide can be brought sufficiently close to the heads of the staples when the rail engaging portion is engaged with the second rail. Therefore, when the sub-magazine is moved to the closed position, the staples can be smoothly guided toward the tool body while suppressing rattling of the staples.

[0013] According to another feature of the present disclosure, the main magazine has a back surface facing the heads of the multiple staples. The back surface is provided on the tool body side and has a clearance surface that forms a gap between the sub-magazine in the driving direction. Therefore, by providing the clearance surface on the tool body side of the back surface, a clearance can be secured between the staple guide that has moved close to the closed position and the heads of the staples even when the number of connected staples is small or when the staples are tilted in the main magazine. This allows the sub-magazine to be moved smoothly to the closed position.

[0014] According to another feature of the present disclosure, the flank is an inclined surface that inclines in a direction opposite to the driving direction as it approaches the tool body. Therefore, the staple guide moves in the opposite direction to the driving direction when moving toward the closed position. By making the inclination direction of the flank follow the movement direction of the staple guide, a gap can be always secured between the staple guide and the head of the staple. This allows the sub-magazine to be reliably moved to the closed position.

[0015] According to another feature of the present disclosure, the main magazine has a rail. The relief surface extends toward the tool body from a start end at a position farther from the tool body than the tip of the first rail on the tool body side. Therefore, when the sub-magazine is moved to the closed position, the staple guide approaches the heads of the staples in the counter-driving direction. The relief surface forms a gap that allows the staples to escape in the counter-driving direction before the staple guide approaches the heads of the staples. Therefore, interference between the staple guide and the heads of the staples can be suppressed until the sub-magazine is moved to the closed position.

[0016] According to another feature of the present disclosure, the depth of the flank in the driving direction is smaller than the amount of movement of the sub-magazine in the driving direction by the guide mechanism. Therefore, when the sub-magazine is moved to the closed position, the gap between the staple guide and the head of the staple gradually narrows. Therefore, after the sub-magazine is moved to the closed position, rattling of the staples in the main magazine can be suppressed.

[0017] According to another feature of the present disclosure, the pusher is provided on the sub-magazine at a position farther from the tool body side than the tip of the staple guide. Therefore, when the sub-magazine is moved to the closed position, the staple guide enters between the pair of legs before the pusher comes into contact with the staple. Therefore, even if the staple is pushed by the pusher and tilted, for example, the tip of the staple guide enters a position that avoids interference with the head of the staple. This makes it possible to suppress interference between the staple guide and the head of the staple.

[0018] According to another feature of the present disclosure, the staples in the main magazine are inclined from the heads to the tips of the legs toward the tool body when the driver is in the standby position. Therefore, the heads of the staples are inclined in the opposite driving direction as they approach the tool body. Even for staples inclined in the main magazine in this way, a gap is secured between the staple guide and the heads of the staples, thereby suppressing mutual interference.

[0019] Next, one embodiment of the present disclosure will be described with reference to Figs. 1 to 13. As an example of the driving tool 1, a so-called gas spring type driving tool is shown, which uses gas pressure in a pressure accumulator as a thrust for driving a driving tool. In the following description, the driving direction of the driving tool is the downward direction, and the opposite driving direction is the upward direction. A user of the driving tool 1 is generally located on the left side of the driving tool 1 in Fig. 1. The side in front of the user is the rear direction, and the side opposite the front side as seen from the user is the forward direction. The left and right directions are based on the user.

[0020] As shown in FIG. 2, the driving tool 1 has a tool body 10. The tool body 10 has a configuration in which a cylinder 12 is accommodated in a generally cylindrical body housing 11. A piston 14 is accommodated in the cylinder 12 so as to be capable of vertical reciprocating motion. An upper part of the cylinder 12 located above the piston 14 communicates with a pressure accumulator chamber 13. A compressed gas such as air is sealed in the pressure accumulator chamber 13. The gas pressure in the pressure accumulator chamber 13 acts as a thrust force that urges the upper surface of the piston 14 downward. A cushion 16 is provided at the lower part of the cylinder 12 to absorb the impact of the piston 14 at the bottom dead center.

[0021] As shown in FIG. 2, a driving nose 2 having a driving passage 3 is provided at the bottom of the tool body 10. The driving passage 3 extends vertically within the tool body 10. The driving passage 3 is connected to the bottom of the cylinder 12. A magazine 30 in which staples 60 are loaded is connected to the rear of the driving nose 2. The magazine 30 can accommodate a plurality of staples 60 extending vertically and aligned in the front-to-rear direction. The plurality of staples 60 are adhered to one another while aligned in the front-to-rear direction (see FIG. 8).

[0022] As shown in Fig. 2, the staple 60 is a U-shaped staple. The staple 60 has a rod-shaped head 60a extending in the left-right direction and a pair of legs 60b extending from both ends of the head 60a in a direction substantially perpendicular to the head 60a. The staple 60 is stored in the magazine 30 with the head 60a positioned upward and the pair of legs 60b extending downward. The staples 60 are sequentially supplied one by one from the magazine 30 forward toward the driving passage 3.

[0023] As shown in Fig. 1, the driving nose portion 2 is provided with a contact arm 4 that can slide up and down. The contact arm 4 is biased downward toward the OFF position. When the tip 4a of the contact arm 4 comes into contact with the workpiece W to be driven, it moves upward against the biasing force toward the ON position.

[0024] As shown in Fig. 1, a grip 5 that is held by the user is provided at the rear of the tool body 10. A trigger 6 that is operated by the user by pulling it with the fingertip is provided on the underside of the front part of the grip 5. A trigger switch that switches from an OFF state to an ON state in response to pulling the trigger 6 is provided inside the grip 5. Pulling the trigger 6 becomes effective when the tip 4a of the contact arm 4 is pressed against the material to be driven and moves to the ON position.

[0025] As shown in FIG. 1, a battery attachment section 7 extending in the vertical direction is provided on the rear surface of the grip 5. A battery pack 8 can be removably attached to the battery attachment section 7. The battery pack 8 can be removed from the battery attachment section 7 and repeatedly charged and used with a separately prepared charger. The battery pack 8 can be used as a power source for other power tools. The battery pack 8 operates as a power source that supplies power to an electric motor 20, which will be described later, and the like.

[0026] As shown in Fig. 1, the main body housing 11 has a substantially cylindrical drive unit case 11a extending in the front-rear direction above the magazine 30, and a connecting portion 11b that vertically connects the drive unit case 11a and the battery attachment portion 7. The grip 5, the battery attachment portion 7, the connecting portion 11b, and the drive unit case 11a cooperate to form a loop shape. The connecting portion 11b accommodates the controller 9, which is housed in a shallow rectangular box-shaped case, in a position that extends in the vertical direction. The controller 9 mainly controls the drive of the electric motor 20.

[0027] As shown in FIG. 2, a driver 15 that is long in the vertical direction is connected to the lower surface of the piston 14. The driver 15 has a main body 15a connected to the piston 14 and a striking part 15c connected to the lower part of the main body 15a. The striking part 15c extends in the vertical direction behind the main body 15a and parallel to the main body 15a. That is, the driver 15 is provided with a two-stage structure consisting of the main body 15a and the striking part 15c. The lower part of the striking part 15c enters the driving passage 3. The driver 15 moves downward by the gas pressure of the pressure accumulator 13 acting on the upper surface of the piston 14. The tip 15d located at the lower end of the striking part 15c strikes one staple 60 supplied to the driving passage 3 when it moves to the driving position. The struck staple 60 is ejected from the ejection port 3a that opens at the lower end of the driving passage 3. The ejected staple 60 is driven into the workpiece W.

[0028] As shown in Fig. 2, a plurality of rack teeth (engaged parts) 15b protruding to the right are provided on the right side of the main body 15a of the driver 15. In this embodiment, six rack teeth 15b are arranged side by side in the longitudinal direction (up-down direction) of the main body 15a. When viewed from the front-rear direction, each rack tooth 15b is provided in a substantially triangular shape with its bottom facing the driving direction (downward). The bottom of the rack tooth 15b engages with an engagement part 24 of the lift mechanism 22, which will be described later.

[0029] As shown in FIG. 1, the drive unit case 11a accommodates an electric motor 20 as a drive source. The electric motor 20 is accommodated in a position in which the motor axis extends in the front-rear direction. The electric motor 20 is started by pulling a trigger 6, using the power of a battery pack 8 as a power source. A planetary reduction mechanism 21 is provided in front of the electric motor 20. The planetary reduction mechanism 21 uses a three-row planetary gear train. A lift mechanism 22 that moves the driver 15 upward is provided in front of the planetary reduction mechanism 21. The electric motor 20, the planetary reduction mechanism 21, and the lift mechanism 22 are arranged side by side on the motor axis. The rotational drive of the electric motor 20 is reduced in speed by the planetary reduction mechanism 21 and transmitted to the lift mechanism 22.

[0030] As shown in FIG. 2, the lift mechanism 22 is provided on the right side of the driving nose portion 2. The lift mechanism 22 has a wheel 23 that can rotate around an axis extending in the front-rear direction. The wheel 23 can rotate counterclockwise when viewed from the front, and clockwise rotation is restricted by a clutch mechanism (not shown). A plurality of engagement portions 24 are attached along the outer periphery of the wheel 23. In this embodiment, for example, six engagement portions 24 are provided. The engagement portions 24 use cylindrical shaft members (pins) that extend in the front-rear direction. The left portion of the wheel 23 enters the driving passage 3 through a window portion provided on the right portion of the driving passage 3.

[0031] As shown in Fig. 2, each engagement portion 24 of the wheel 23 engages with the bottom of the rack teeth 15b of the driver 15 in the driving passage 3. With at least one of the engagement portions 24 engaged with the bottom of the rack teeth 15b, the wheel 23 rotates counterclockwise. This causes the driver 15 and the piston 14 to return upward. The lift mechanism 22 returns the piston 14 upward, thereby increasing the gas pressure in the pressure accumulator chamber 13. The figure shows the driver 15 being lifted to and held in a standby position prior to the driving operation.

[0032] As shown in FIGS. 2 and 3, the contact arm 4 extends in the vertical direction on the left side of the driving passage 3. The contact arm 4 can engage with a stopper 56 (described later) on the left side of the magazine 30. The contact arm 4 is restricted from moving upward by engaging with an engagement portion 56c of the stopper 56. The contact arm 4 is connected to an adjustment dial 4b above the stopper 56. The amount of protrusion of the tip 4a (see FIG. 1) of the contact arm 4 in the vertical direction can be adjusted by rotating the adjustment dial 4b. A switch 4c is provided above the adjustment dial 4b. When the tip 4a of the contact arm 4 is pressed against the material to be driven, the contact arm 4 moves upward from the OFF position to the ON position. The upwardly moved contact arm 4 presses the switch 4c to turn it on. This enables the pulling operation of the trigger 6 (see FIG. 1). When the contact arm 4 is not pressed against the material to be driven and is in the OFF position, the switch 4c is in the OFF state. At this time, the pulling operation of the trigger 6 is not effective.

[0033] 1, 4 and 8, the magazine 30 has a main magazine 31 and a sub-magazine 33 that is slidable in the front-rear direction relative to the main magazine 31. The main magazine 31 extends rearward from the driving nose portion 2. The main magazine 31 is capable of housing a plurality of staples 60. The front end of the main magazine 31 opens toward and communicates with the driving passage 3 in the front. An opening 31a that opens downward is provided at the bottom end of the main magazine 31.

[0034] As shown in Figs. 4 and 8, the sub-magazine 33 has a pusher 34 and a staple guide 35. The pusher 34 urges the staple 60 from inside the main magazine 31 toward the front surface 3b of the staple driving passage 3. The staple guide 35 enters between a pair of legs 60b of the staple 60 to maintain the position of the staple 60 in the main magazine 31. The staple guide 35 is a flat plate-shaped member made of a metal such as iron. A magazine end 36 capable of opening and closing the opening 31a of the main magazine 31 is connected to the lower part of the sub-magazine 33. The magazine end 36 is made of a synthetic resin, for example. When the sub-magazine 33 is moved to the closed position M2, the magazine end 36 covers the opening 31a of the main magazine 31 from below. A protruding portion 37 protruding downward is provided at the front end of the sub-magazine 33. The protruding portion 37 cooperates with the tool body 10 to form the driving passage 3 that is connected to the ejection port 3a.

[0035] As shown in Figs. 4 and 8, the main magazine 31 has a back surface 32 extending long in the front-rear direction and extending left-right at the top end. A pair of side walls 31b extend downward from both the left and right ends of the back surface 32. That is, the main magazine 31 is substantially U-shaped when viewed from the front. The left-right width of the back surface 32 and the opening 31a is the same as or slightly longer than the left-right width of the head 60a of the staple 60. When the driving tool 1 is oriented so that the bottom side faces the top, the opening 31a is located on the top side and the back surface 32 is located on the bottom side. The staples 60 are loaded into the main magazine 31 through the opening 31a when the driving tool 1 is in this position. Therefore, the back surface 32 corresponds to the bottom surface of the main magazine 31 when the staples 60 are loaded.

[0036] As shown in Fig. 8, the rear part of the back surface 32 extends parallel to the front-rear direction in which the staple guide 35 moves. A planar flank 32a that slopes upward toward the front is provided at the front part of the back surface 32. The flank 32a extends planarly from a starting end 32b located at the rear end to a terminal end 32c located at the front end. The flank 32a is smoothly connected to the rear part of the back surface 32 at the starting end 32b. The vertical distance between the starting end 32b and the terminal end 32c, in other words, the depth D1 of the flank 32a, is, for example, 1 mm.

[0037] 4, 8 and 11, the front end of the staple guide 35 extends linearly in the vertical direction. The upper end of the front end of the staple guide 35 is a tip 35a that faces the back surface 32 of the main magazine 31 in the vertical direction. When the sub-magazine 33 is located at the rear open position M1, a gap longer than the front-to-rear length of the head 60a of the staple 60 is provided between the tip 35a of the staple guide 35 and the rear part of the back surface 32 in the vertical direction.

[0038] 4, 8, and 11, the pusher 34 is a plate-like member having a U-shape when viewed from the front-rear direction, which is substantially the same as the staple 60. A front surface 34a of the pusher 34 extends flatly in the up-down direction. An upper end 34c of the front surface 34a of the pusher 34 is chamfered into a flat surface inclined relative to the front surface 34a.

[0039] As shown in Figs. 4, 8 and 11, a pair of upper and lower shafts 34e extending in the front-rear direction are attached to the staple guide 35. A pusher guide 34f is attached to the pair of shafts 34e so as to be slidable in the front-rear direction. A compression spring 34d is provided in the sub-magazine 33 so as to surround each shaft 34e in the circumferential direction. The compression spring 34d biases the pusher guide 34f forward. The pusher 34 is provided integrally with the pusher guide 34f. Therefore, the pusher 34 is biased forward so as to be slidable in the front-rear direction relative to the staple guide 35. When the pusher 34 is not in contact with the staple 60 and is biased to the front end, the front surface 34a of the pusher 34 is located slightly behind the tip 35a of the staple guide 35.

[0040] As shown in FIGS. 4, 6, and 10, the magazine 30 has a guide mechanism 40 that guides the magazine end 36 to slide in the front-rear direction relative to the main magazine 31. The guide mechanism 40 has rails 41 provided on the side walls 31b of the main magazine 31 and rail engagement parts 45 provided on the magazine end 36. The rails 41 are provided on the lower parts of each of the pair of left and right side walls 31b. The rail engagement parts 45 are provided on the left and right sides of the front end of the magazine end 36, one each, so as to be able to engage with the pair of left and right rails 41. Each rail engagement part 45 is provided in the shape of a substantially rectangular box that protrudes inward from both the left and right sides of the magazine end 36. The rail engagement part 45 has an upper end 45a that extends flatly in the front-rear direction and a lower end 45b that extends flatly in the front-rear direction parallel to the upper end 45a.

[0041] As shown in FIGS. 4, 7, and 10, the rail 41 is formed by connecting a first rail 42, a second rail 43, and a third rail 44 arranged in order from the rear of the main magazine 31. The rail 41 has an upper surface 41a with which an upper end 45a of the rail engagement portion 45 slidably engages, and a lower surface 41b with which a lower end 45b of the rail engagement portion 45 slidably engages. The first rail 42 extends linearly forward from the rear of the side wall 31b. The first rail 42 is connected to the second rail 43 at its tips (front ends) 42a, 42b close to the tool body 10 (see FIG. 1). The tip 42a is provided on the upper surface 41a side of the rail 41. The tip 42b is provided on the lower surface 41b side of the rail 41. When the rail engagement portion 45 is engaged with the first rail 42, it is located at a rear open position M1. At this time, the opening 31a of the main magazine 31 is open.

[0042] As shown in FIGS. 4, 7, and 10, the second rail 43 is inclined relative to the first rail 42 and communicates with the first rail 42. The second rail 43 is inclined upward toward the front tool body 10 side (see FIG. 1). The second rail 43 extends linearly in the extension direction. The second rail 43 is communicated with the third rail 44 at its tips (front ends) 43a, 43b close to the tool body 10. The tip 43a is provided on the upper surface 41a side of the rail 41. The tip 43b is provided on the lower surface 41b side of the rail 41. The third rail 44 extends linearly in the front-rear direction above the first rail and parallel to the first rail 42. In other words, the first rail 42 is provided below the third rail 44, which is provided at approximately the same position as the conventional rail. The rail engagement portion 45 is guided by the third rail 44 and can move to the closed position M2 at the front end. At this time, the opening 31 a of the main magazine 31 is covered by the magazine end 36 .

[0043] As shown in FIG. 10, the vertical distance D2 from the tip 42a to the tip 43a or from the tip 42b to the tip 43b corresponds to the vertical width of the second rail 43. The distance D2 is the distance by which the rail engaging portion 45, and thus the staple guide 35 integral with the magazine end 36, moves upward in the direction opposite to the driving direction when the sub-magazine 33 is slid forward toward the closing side. The distance D2 is longer than the vertical depth D1 of the flank surface 32a, and is, for example, 1.5 mm to 2.0 mm (see FIG. 11). The lower tip 42b where the first rail 42 and the second rail 43 are connected is the starting point where the rail engaging portion 45, and thus the staple guide 35 integral with the magazine end 36 (see FIG. 11) start to be guided upward when the sub-magazine 33 is slid forward toward the closing side.

[0044] 11, the starting end 32b located at the rear end of the flank 32a is located farther rearward from the tool body 10 than the tip 42b. Therefore, the flank 32a is inclined so as to move upward from the tip 35a of the staple guide 35 earlier than the staple guide 35 moves upward.

[0045] As shown in Fig. 3, the driving tool 1 has an empty-strike prevention mechanism 55 that prevents the driver 15 from empty-strike without striking the staples 60. The empty-strike prevention mechanism 55 operates when the number of staples 60 remaining in the magazine 30 is a predetermined number or less, and regulates the winding-up operation of the driver 15 by the lift mechanism 22. The empty-strike prevention mechanism 55 of the present disclosure operates when the number of staples 60 remaining inside the magazine 30 is seven or less. The empty-strike prevention mechanism 55 is provided with a stopper 56 that regulates the upward movement of the contact arm 4. The stopper 56 is provided on the left side of the main magazine 31.

[0046] As shown in FIG. 3, the stopper 56 extends in a generally straight line in the front-rear direction. The stopper 56 can rotate left and right around a rotating shaft 56a extending in the up-down direction. The rotating shaft 56a is provided slightly behind the center of the stopper 56 in the front-rear direction. An engagement portion 56c is provided at the front end of the stopper 56, which can engage with the contact arm 4 in the OFF position to restrict the upward movement of the contact arm 4. The stopper 56 has an abutment portion 56b that protrudes to the right in a generally spherical shape behind the rotating shaft 56a. A compression spring 56d is provided behind the rotating shaft 56a and to the left of the abutment portion 56b. The compression spring 56d biases the stopper 56 to rotate in a clockwise direction when viewed from below.

[0047] As shown in FIG. 3, the contact portion 56b is biased by the compression spring 56d toward the left leg 60b of the staple 60 or the left side surface 34b of the pusher 34. When the contact portion 56b is in contact with the leg 60b of the staple 60 or the side surface 34b of the pusher 34, the engagement portion 56c is located to the right where it does not engage with the contact arm 4. When the pusher 34 moves forward of the contact portion 56b, the contact portion 56b enters the rear side of the pusher 34. As a result, the engagement portion 56c moves leftward by the biasing force of the compression spring 56d and becomes capable of engaging with the contact arm 4. Since the upward movement of the contact arm 4 is restricted, the pulling operation of the trigger 6 (see FIG. 1) is not effective, and the electric motor 20 is not started. Thus, when the remaining number of staples 60 in the main magazine becomes seven or less, it is possible to prevent the driver 15 from firing blank shots.

[0048] Next, a series of steps of the driving operation of the driving tool 1 will be described with reference to Figures 2, 3, and 8. The figure shows the driver 15 in a standby state. The driver 15 in the standby state is held in a stopped state at a standby position slightly below the top dead center. The head 60a of the staple 60 located at the foremost end of the main magazine 31 abuts against the rear surface of the tip 15d of the driver 15. Therefore, the head 60a of the staple 60 at the foremost end is restricted from entering the driving passage 3. The leg 60b of the staple 60 at the foremost end can enter the driving passage 3. However, since the head 60a has not entered the driving passage 3, even if the driver 15 moves downward from the standby position, the head 60a is not struck, and the leg 60b can retreat backward to the main magazine 31.

[0049] In the standby state, the contact arm 4 pressed against the material to be driven moves upward and the trigger 6 is pulled, starting the electric motor 20. When the electric motor 20 is started, the wheel 23 of the lift mechanism 22 rotates. The engagement portion 24 engaged with the bottom of the lowest rack tooth 15b moves the lowest rack tooth 15b upward as the wheel 23 rotates. This causes the driver 15 to move upward from the standby position to the top dead center. When the driver 15 moves to the top dead center, the head 60a of the frontmost staple 60 is urged by the pusher 34 and enters the driving passage 3.

[0050] When the driver 15 reaches the top dead center and reaches a state immediately before driving, the engaging portion 24 is released from the bottom of the rack tooth 15b at the lowest end. As a result, the driver 15 is urged downward by the gas pressure of the pressure accumulator chamber 13 applied to the piston 14. The tip 15d of the driver 15 moves downward in the driving passage 3 and strikes the head 60a of one staple 60 in the driving passage 3. The wheel 23 continues to rotate while the driver 15 is moving downward and even after the wheel 23 reaches the bottom dead center. When the driver 15 is at the bottom dead center, if the wheel 23 rotates to a predetermined rotation angle, one of the engaging portions 24 engages with the bottom of the rack tooth 15b at the highest end. This starts a return operation that moves the driver 15 upward in the opposite driving direction. When one of the engaging portions 24 engages with the bottom of the rack tooth 15b at the lowest end, the driver 15 returns to the standby position. For example, by appropriately controlling the time from the start of the electric motor 20 activation, the electric motor 20 is stopped at the stage where the piston 14 reaches the standby position. This causes the driver 15 to be held at the standby position. This completes the series of driving operations.

[0051] Next, the operation of moving the sub-magazine 33 forward toward the closing side will be described with reference to Figures 7 to 13. First, when the sub-magazine 33 is in the open position M1, the rail engagement portion 45 engages with the first rail 42 and can slide in the front-rear direction. Between the front-rear direction of the tip 35a of the staple guide 35 and the back surface 32, a gap longer than the front-rear length of the head 60a of the staple 60 is formed. The staples 60 are aligned along the back surface 32 in the main magazine 31. Therefore, when the sub-magazine 33 is in the open position M1, a gap is provided between the tip 35a of the staple guide 35 and the head 60a of the staple 60 in the up-down direction. Therefore, the tip 35a of the staple guide 35, which moves forward and backward, is prevented from interfering with the head 60a of the staple 60 located at the rear end.

[0052] When the sub-magazine 33 is slid further forward, the rail engaging portion 45 engages with the second rail 43 forward of the tip 42b. The rail engaging portion 45 is guided by the second rail 43 and moves forward in the counter driving direction. As a result, the tip 35a of the staple guide 35 also moves upward and approaches the head 60a of the staple 60. When the tip 35a of the staple guide 35 has advanced forward of the staple 60 at the rear end, it can slide in the front-rear direction without interfering with the head 60a of the staple 60 even when it approaches the head 60a of the staple 60.

[0053] A clearance surface 32a that slopes upward toward the front is provided at the front part of the rear surface 32 of the main magazine 31. A start end 32b of the clearance surface 32a is provided rearward of a tip end 42b, which is the rear end of the second rail 43. This allows the head 60a of the rearmost staple 60 to be released upward before the tip end 35a of the staple guide 35 approaches. This allows a gap to be secured between the tip end 35a of the staple guide 35 and the head 60a of the rearmost staple 60, thereby suppressing mutual interference.

[0054] For example, the head 60a of the leading staple 60 may be restricted from entering the driving passage 3 by the tip 15d of the driver 15 (see Figs. 11 to 13). In this case, only the legs 60b enter the driving passage 3. The staples 60 close to the driving passage 3 are inclined in the front-rear direction so that the legs 60b are positioned forward of the heads 60a, following the flank surface 32a of the rear surface 32. Even in this case, the head 60a of the rearmost staple 60 can be moved upward before the tip 35a of the staple guide 35 approaches. Therefore, a gap can be secured between the tip 35a of the staple guide 35 and the head 60a of the rearmost staple 60, and mutual interference can be suppressed.

[0055] 12 and 13, there are cases where multiple staples 60 are loaded behind multiple staples 60 that have already been loaded, and the front multiple staples 60 and the rear multiple staples 60 are not aligned in the same direction. Even in such a case, the tip 35a of the staple guide 35 is positioned on the lower side where a gap can be secured between the head 60a of the rearmost staple 60 newly loaded. Therefore, mutual interference can be suppressed.

[0056] As described above, the driving tool 1 ejects a U-shaped staple 60 having a head 60a connecting a pair of legs 60b as shown in Figs. 2, 7, 8, 10 and 11. The driving tool 1 has a tool body 10 having a driver 15 for striking the staple 60. The driving tool 1 has a main magazine 31 extending from the tool body 10 and accommodating a plurality of staples 60. The driving tool 1 has a pusher 34 for pushing the plurality of staples 60 toward the tool body 10 in the main magazine 31. The driving tool 1 has a staple guide 35 that is inserted between a pair of legs 60b of the staple 60 in the main magazine 31. The driving tool 1 has a sub-magazine 33 to which the pusher 34 and the staple guide 35 are attached. The driving tool 1 has a guide mechanism 40 which guides the sub-magazine 33 from an open position M1 relative to the main magazine 31 to a closed position M2 toward the tool body 10, and guides the sub-magazine 33 in the direction opposite to the driving direction while moving it from the open position M1 to the closed position M2.

[0057] Therefore, the staple guide 35 is located relatively closer to the driving direction side (lower side) when the sub-magazine 33 is away from the closed position M2 than when it is close to the closed position M2. Therefore, when the sub-magazine 33 is away from the closed position M2, a gap can be provided between the tip 35a of the staple guide 35 on the counter driving direction side and the head 60a of the staple 60 in the main magazine 31. Therefore, even if the staple 60 is slightly inclined in the feed direction, interference between the head 60a of the staple 60 and the staple guide 35 can be suppressed. This allows the guide mechanism 40 to move the staple guide 35 toward the closed position M2 so as not to interfere with the staple 60. When the sub-magazine 33 is close to the closed position M2, the tip 35a of the staple guide 35 on the counter driving direction side and the head 60a of the staple 60 in the main magazine 31 come close to each other. Therefore, the staple guide 35 can suppress rattling of the staple 60 in the main magazine 31 by moving the sub-magazine 33 to the closed position M2.

[0058] As shown in Figs. 4, 7 and 10, the guide mechanism 40 has a rail 41 provided on one of the two components, the main magazine 31 and the sub-magazine 33. The guide mechanism 40 has a rail engagement portion 45 provided on the other of the two components and slidably engaged with the rail 41. Therefore, the movement of the sub-magazine 33 relative to the main magazine 31 can be reliably guided by the rail 41 and the rail engagement portion 45. Therefore, when the sub-magazine 33 is in the open position M1, the staple guide 35 can be reliably guided at a position away from the heads 60a of the staples 60 in the driving direction. When the sub-magazine 33 is in the closed position M2, the staple guide 35 can be reliably guided so as to approach the heads 60a of the staples 60 in the opposite driving direction. This makes it possible to reliably suppress interference between the staple guide 35 and the heads 60a of the staples 60 when closing the sub-magazine 33, while also suppressing rattling of the staples 60 in the main magazine 31.

[0059] As shown in Figs. 4, 7, and 10, the rail 41 includes a first rail 42 that extends linearly toward the tool body 10 (see Fig. 1), and a second rail 43 that bends from 42b of the first rail 42 in the opposite direction to the driving direction. Therefore, when the rail engaging portion 45 is engaged with the first rail 42 and the sub-magazine 33 is away from the closed position M2, the staple guide 35 is maintained not to move in the direction opposite to the driving direction (upward). When the sub-magazine 33 is brought close to the closed position M2 and the rail engaging portion 45 is engaged with the second rail 43, the staple guide 35 can be moved in the direction opposite to the driving direction. Therefore, interference between the staple guide 35 and the head 60a of the staple 60 can be suppressed until the sub-magazine 33 is brought close to the vicinity of the closed position M2. This makes it possible to suppress interference between the staple guide 35 and the head 60a of the staple 60 even when, for example, the number of connected staples 60 is small and the rearmost staple 60 furthest from the tool body 10 is relatively close to the tool body 10.

[0060] As shown in Figures 4 and 10, the rail 41 includes a third rail 44 that bends from the tip 43b of the second rail 43 toward the tool body 10 (see Figure 1) and extends parallel to the first rail 42. Therefore, when the rail engaging portion 45 is engaged with the third rail 44, the staple guide 35 can be moved parallel to the feeding direction of the staples 60. The staple guide 35 can be brought sufficiently close to the head 60a of the staples 60 at the stage where the rail engaging portion 45 is engaged with the second rail 43. Therefore, when the sub-magazine 33 is moved to the closed position M2 (see Figure 7), the staples 60 can be smoothly guided toward the tool body 10 while suppressing rattling of the staples 60.

[0061] 8 and 11, the main magazine 31 has a rear surface 32 facing the heads 60a of the staples 60. The rear surface 32 is provided on the tool body 10 side and has a clearance 32a that forms a gap between the rear surface 32 and the sub-magazine 33 in the driving direction. Therefore, by providing the clearance 32a on the tool body 10 side of the rear surface 32, a gap can be secured between the staple guide 35 that has moved close to the closed position M2 and the heads 60a of the staples 60 even when the number of connected staples 60 is small or when the staples 60 are inclined in the main magazine 31. This allows the sub-magazine 33 to be moved smoothly to the closed position M2.

[0062] 8 and 11, the flank 32a is an inclined surface that inclines in the opposite direction to the driving direction the closer it is to the tool body 10. Therefore, the staple guide 35 moves in the opposite driving direction (upward) when moving toward the closed position M2. By making the inclination direction of the flank 32a follow the moving direction of the staple guide 35, a gap can always be secured between the staple guide 35 and the heads 60a of the staples 60. This allows the sub-magazine 33 to be reliably moved to the closed position M2.

[0063] As shown in FIGS. 8 and 11, the main magazine 31 has a rail 41 (see FIG. 10). The flank surface 32a extends toward the tool body 10 from a start end 32b at a position farther from the tool body 10 than a tip end 42b on the tool body 10 side of the first rail 42 (see FIG. 10). Therefore, when the sub-magazine 33 is moved to the closed position M2, the staple guide 35 approaches the head 60a of the staple 60 in the direction opposite to the driving direction. The flank surface 32a forms a gap through which the staple 60 can escape in the direction opposite to the driving direction before the staple guide 35 approaches the head 60a of the staple 60. Therefore, interference between the staple guide 35 and the head 60a of the staple 60 can be suppressed until the sub-magazine 33 is moved to the closed position M2.

[0064] As shown in Figures 8 and 11, the depth D1 of the flank 32a in the driving direction is smaller than the amount of movement of the sub-magazine 33 in the driving direction by the guide mechanism 40 (distance D2 in Figures 7 and 10). Therefore, when the sub-magazine 33 is moved to the closed position M2, the gap between the staple guide 35 and the head 60a of the staple 60 gradually narrows. Therefore, after the sub-magazine 33 is moved to the closed position M2, rattling of the staples 60 in the main magazine 31 can be suppressed.

[0065] 4, 8, and 11, the pusher 34 is provided in the sub-magazine 33 at a position farther from the tool body 10 side than the tip 35a of the staple guide 35. Therefore, when the sub-magazine 33 is moved to the closed position M2, the staple guide 35 enters between the pair of legs 60b before the pusher 34 comes into contact with the staple 60. Therefore, even if the staple 60 is pushed by the pusher 34 and inclined, for example, the tip 35a of the staple guide 35 enters a position that avoids interference with the head 60a of the staple 60. This makes it possible to suppress interference between the staple guide 35 and the head 60a of the staple 60.

[0066] 11, the staples 60 in the main magazine 31 are inclined from the head 60a to the tip of the leg 60b toward the tool body 10 when the driver 15 is in the standby position. Therefore, the head 60a of the staple 60 is inclined in the counter driving direction (upward) as it approaches the tool body 10. Even for the staples 60 inclined in this way in the main magazine 31, a gap is secured between the staple guide 35 and the head 60a of the staple 60, thereby suppressing mutual interference.

[0067] The driving tool 1 of the present embodiment described above can be modified as appropriate. A so-called gas spring type driving tool 1 has been exemplified. Instead of this, for example, it may be applied to a compressed air type driving tool in which the pressure of the supplied compressed air is used as the thrust of the driver 15, a mechanical spring type driving tool, a flywheel type driving tool, etc.

[0068] The guide mechanism 40 is exemplified by a rail 41 and a rail engagement portion 45 which engage with each other. Alternatively, for example, a link mechanism or the like may be used to guide the movement of the sub-magazine 33. For example, the movement of the sub-magazine 33 may be guided only by the biasing force of a biasing member. The configuration in which the rail 41 is provided on the main magazine 31 side and the rail engagement portion 45 is provided on the magazine end 36 side has been exemplified. Alternatively, the rail engagement portion 45 may be provided on the main magazine 31 side and the rail 41 may be provided on the magazine end 36 side.

[0069] The staple guide 35 is made of iron. Alternatively, the staple guide 35 may be made of, for example, synthetic resin. The position of the tip 42b, which is the rear end where the second rail 43 begins, and the position of the start end 32b, which is the rear end of the flank 32a, may be appropriately changed depending on, for example, the number of staples remaining in the main magazine 31 when the blank firing prevention mechanism 55 is activated. [Explanation of symbols]

[0070] 1...Driving tool 2…Driving nose part 3...Injection path, 3a...Ejection port, 3b...Front 4...contact arm, 4a...tip, 4b...adjustment dial, 4c...switch 5. Grip 6...Trigger 7…Battery mounting section 8…Battery pack 9. Controller 10...Tool body 11...main body housing, 11a...drive unit case, 11b...connection unit 12...Cylinder 13...Accumulation chamber 14…Piston 15: driver; 15a: main body; 15b: rack teeth (engaged portion); 15c: striking portion 15d…Tip 16…Cushion 20...Electric motor 21...Planetary reduction mechanism 22...Lift mechanism 23…Wheels 24...Engagement part 30…Magazine 31...main magazine, 31a...opening, 31b...side wall 32...back surface, 32a...flank surface, 32b...starting end, 32c...ending end 33…Sub-magazine 34... pusher, 34a... front surface, 34b... side surface, 34c... upper end, 34d... compression spring 34e...shaft, 34f...pusher guide 35...staple guide, 35a...tip 36...Magazine end 37...Protrusion 40...Guide mechanism 41...Rail, 41a...Top surface, 41b...Bottom surface 42...first rail, 42a...tip (front end), 42b...tip (front end) 43... second rail, 43a... tip (front end), 43b... tip (front end) 44…Third rail 45...rail engagement portion, 45a...upper end, 45b...lower end 55…Anti-empty firing mechanism 56: stopper, 56a: rotating shaft, 56b: contact portion, 56c: engagement portion 56d…Compression spring 60: staple (driving tool), 60a: head, 60b: leg W…Material to be driven M1: Open position, M2: Closed position D1: Depth (of flank), D2: Distance

Claims

1. A staple driving tool that ejects a U-shaped staple having a head that connects a pair of legs, A tool body equipped with a driver for striking the staples, A main magazine extending from the tool body and housing a plurality of staples, A pusher that pushes the plurality of staples toward the tool body within the main magazine, A staple guide is inserted between the pair of legs of the staple within the main magazine, The sub-magazine to which the pusher and the staple guide are attached, A driving tool having a guide mechanism that guides the sub-magazine from an open position relative to the main magazine to a closed position toward the tool body, and guides the sub-magazine in the opposite direction to the driving direction while moving from the open position to the closed position.

2. The driving tool according to claim 1, The guide mechanism is a driving tool having a rail provided on one of the two parts, the main magazine and the sub-magazine, and a rail engaging portion provided on the other of the two parts that is slidably engaged with the rail.

3. The driving tool according to claim 2, The rail is a driving tool that includes a first rail extending linearly toward the tool body and a second rail that bends from the tip of the first rail in the direction opposite to the driving direction.

4. The driving tool according to claim 3, The driving tool includes a third rail that bends from the tip of the second rail toward the tool body and extends parallel to the first rail.

5. A driving tool according to claim 3 or 4, The main magazine has a back surface facing the heads of the plurality of staples The rear surface of the driving tool is provided on the tool body side and has a relief surface that forms a gap between it and the sub-magazine in the driving direction.

6. The driving tool according to claim 5, The aforementioned relief surface is an inclined surface that slopes in the direction opposite to the driving direction as it approaches the tool body, in a driving tool.

7. The driving tool according to claim 5, The main magazine has the rail, The relief surface is the driving tool that extends from a starting end located further away from the tool body than the tip of the first rail on the tool body side toward the tool body.

8. The driving tool according to claim 5, A driving tool in which the depth of the relief surface in the driving direction is smaller than the amount of movement of the sub-magazine in the driving direction by the guide mechanism.

9. A driving tool according to any one of claims 1 to 4, The pusher is a driving tool provided in the sub-magazine at a position further away from the tool body than the tip of the staple guide.

10. A driving tool according to any one of claims 1 to 4, The staples in the main magazine are a driving tool that, when the driver is in the standby position, is tilted toward the tool body from the head toward the tip of the legs.

Images