JP6169519B2 - Driving tool - Google Patents

Description

  The present invention relates to a driving tool such as a rechargeable pin tacker.

  As driving tools such as pin tackers mainly used for joining wood and gypsum boards, electric tools using an electric motor as a driving source are provided in addition to those using compressed air as a driving source. Conventional techniques relating to such an electric driving tool are disclosed in the following patent documents. The following patent document discloses a technique for reducing a reaction received by a user at the time of driving by displacing a reaction reducing member in a direction opposite to the moving direction of the driver for driving the driving tool.

JP 2008-260124 A JP 2012-183632 A

  However, according to the above-described conventional reaction reduction structure, the structure is such that the reaction reduction member is moved in the direction opposite to the driver using the dynamic pulley mechanism, and the dynamic pulley mechanism uses a wire, a rope, or the like as power transmission means. Therefore, there is a problem that it is difficult to improve durability. The present invention has been made to solve such a conventional problem, and an object of the present invention is to improve the durability of a reaction reduction mechanism (mechanism for reducing reaction at the time of driving) in this type of driving tool.

  Said subject is solved by each following invention.

  According to a first aspect of the present invention, there is provided a grip housing integrally having a grip portion to be gripped by a user, and supported to be displaceable in the driving direction independently of each other with respect to the grip housing, and urged in the counter driving direction. The driving tool includes a tool main body portion, a driving nose portion, and a driver for driving a driving tool guided by the driving nose portion. In such a driving tool, when the driver moves in the driving direction (when driving), the driving nose portion is displaced in the driving direction against the urging force. According to the first invention, even if the user's hand holding the grip portion of the grip housing is displaced in the direction of lifting from the driving material (counter driving direction) due to the reaction during driving, the nose portion is driven into the grip housing. By moving in the driving direction against the urging force, the lift of the grip housing is absorbed, and the reaction during driving is substantially absorbed or reduced. Further, since the driving nose portion is displaced in the driving direction and the tip portion (injection port) is maintained in contact with the driving material, the driving position is not shifted and accurate driving can be realized. In this way, the driving nose portion is displaced in the same driving direction as the driver to absorb or reduce the reaction at the time of driving, and the reaction reducing member is moved in the direction opposite to the driver using a moving pulley mechanism as in the past. Therefore, the durability of the reaction reduction mechanism (mechanism that allows the nose portion to be displaced with respect to the grip portion in the driving direction) can be enhanced.

  A second invention is the driving tool according to the first invention, wherein the tool main body portion is displaced in the counter driving direction by an urging force when the driver moves in the driving direction. According to the second invention, the tool nose portion is displaced in the driving direction against the urging force and the reaction at the time of driving is reduced or absorbed, and the tool main body portion is moved in the counter driving direction by the urging force. Also by the displacement, the reaction at the time of driving is more reliably reduced or absorbed. The tool body is displaced in the counter-pushing direction by the urging force when driven, and is not a conventional structure using a moving pulley mechanism. The durability of the mechanism capable of being displaceable is improved.

  A third invention is the driving tool according to the second invention, in which a compression spring is interposed between the driver and the tool main body portion to urge the tool main body portion in the counter driving direction. According to the third aspect of the invention, the tool main body is biased in the counter driving direction by the compression spring interposed between the driver, and the biasing force causes the tool main body to be displaced to the counter driving side when driven, thereby reacting. Is absorbed.

  A fourth invention is a driving tool according to any one of the first to third inventions, wherein the driving nose part and the tool main body part are simultaneously displaced in opposite directions. According to the fourth invention, the reaction at the time of driving is more efficiently and reliably absorbed or reduced.

  According to a fifth invention, in the fourth invention, a pinion gear is provided in the grip housing, a rack gear portion is provided in each of the driving nose portion and the tool main body portion, and the pinion gear is sandwiched between both the rack gear portions. In addition, the driving tool is configured so that the driving nose portion and the tool main body portion are simultaneously displaced in opposite directions. According to the fifth aspect of the present invention, the driving nose portion is displaced in the driving direction through the meshing of the pinion gear with the rack gear portion, and the tool main body portion is displaced in the counter driving direction, so that the reaction at the time of driving is absorbed or reduced. For this reason, the reaction reduction mechanism and thus the durability of the driving tool can be improved as compared with the conventional configuration using the moving pulley mechanism.

It is a longitudinal cross-sectional view of the driving tool which concerns on embodiment of this invention. This figure shows an initial state where the driver for hitting is located at the top dead center. It is a longitudinal cross-sectional view of the driving tool which concerns on embodiment of this invention. This figure shows a state immediately after the driver starts to move down after the restraint state at the top dead center is released. This figure shows a state in which the driving nose portion is displaced in the driving direction against the biasing force, and the tool main body portion is displaced in the counter driving direction by the biasing force. It is a longitudinal cross-sectional view of the driving tool which concerns on embodiment of this invention. This figure shows a state in which the driver reaches the lower moving end and driving of the driving tool is completed. It is a longitudinal cross-sectional view of the driving tool which concerns on embodiment of this invention. This figure shows a state in which the driving nose portion is returned to the upper moving end position by the urging force, and the tool main body portion is returned to the lower moving end position against the urging force. FIG. 2 is a cross-sectional view taken along the line (V)-(V) in FIG. It is a whole perspective view of a driving tool provided with a reaction reduction mechanism concerning a 2nd embodiment. It is a front view of a driving tool provided with the reaction reduction mechanism concerning a 2nd embodiment. In this figure, the main body housing is removed. It is a figure which shows the operation state of the drive part which concerns on 2nd Embodiment.

  Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an outline of the driving tool 1 according to the first embodiment. The driving tool 1 according to the first embodiment includes a tool main body 10, a grip 20 held by a user, and a magazine 30 for loading a number of driving tools. The tool main body 10 includes a configuration in which a drive mechanism 40 and a striking mechanism 45 are housed in the main body housing 11. The drive mechanism 40 has a function of returning the striking mechanism 45 to the initial position.

  The drive mechanism 40 includes an electric motor 41 as a drive source, and a first lift-up gear 42 and a second lift-up gear 43, both of which are spur gears. The electric motor 41 is accommodated in a motor housing 12 provided at the rear part of the main body housing 11. The drive gear 41a attached to the output shaft of the electric motor 41 is meshed with the driven gear 42a. The driven gear 42 a is integrally and coaxially provided on the rear surface of the first lift up gear 42. The first lift-up gear 42 includes a first shaft 42c at the center thereof. The first shaft 42c is supported so as to be rotatable around its axis via a bearing 42b. The first lift-up gear 42 is rotatably supported by the main body housing 11 about the axis of the first shaft 42c. A first lift-up roller 42 d is rotatably attached to the front surface of the first lift-up gear 42. The first lift-up roller 42d is attached at a position that is eccentric with respect to the first shaft 42c by an eccentric distance d1.

  The first lift up gear 42 is meshed with the second lift up gear 43. The second lift-up gear 43 includes a second shaft 43c at the center thereof. The second shaft 43c is supported so as to be rotatable about its axis via a bearing 43b. The second lift up gear 43 is rotatably supported by the main body housing 11 about the axis of the second shaft 43c. A second lift-up roller 43 d is rotatably attached to the front surface of the second lift-up gear 43. The second lift-up roller 43d is attached to a position that is eccentric with respect to the second shaft 43c by an eccentric distance d2. The first lift-up roller 42d and the second lift-up roller 43d have the same outer diameter. Regarding the length in the axial direction, the first lift-up roller 42d is set to be larger than the second lift-up roller 43d.

  When the electric motor 41 is started, the first lift-up gear 42 rotates around the axis of the first shaft 42c through the meshing of the drive gear 41a and the driven gear 42a. As the first lift-up gear 42 rotates, the first lift-up roller 42d revolves around the axis of the first shaft 42c with a radius d1 (eccentric distance d1). As the first lift-up gear 42 rotates, the second lift-up gear 43 rotates about the axis of the second shaft 43c in the direction opposite to the first lift-up gear 42. As the second lift-up gear 43 rotates around the axis of the second shaft 43c, the second lift-up roller 43d revolves around the axis of the second shaft 43c with a radius d2 (eccentric distance d2).

  The phases of the first lift-up roller 42d and the second lift-up roller 43d are shifted by approximately 180 °. For this reason, when the first and second lift-up gears 42 and 43 rotate in the opposite directions, the first lift-up roller 42d and the second lift-up roller 43d are in the opposite directions with respect to the vertical position. Displace. By the operation of both lift-up rollers 42d and 43d, the driving tool hitting driver 46 in the hitting mechanism 45 is lifted up from the descending end position by about (d1 × 2 + d2 × 2) and returned to the top dead center. The striking mechanism 45 includes the driver 46, the piston 47, and the first compression spring 48. Details of the striking mechanism 45 will be described later.

  A grip housing 21 is coupled to the lower portion of the main body housing 11. A lower portion of the main body housing 11 is inserted on the inner peripheral side of the grip housing 21. Two flat base portions 13 and 13 are provided at the lower portion of the main body housing 11. Both base parts 13 and 13 are projected in parallel with each other at a constant interval. Rack gear portions 13a and 13b are provided on the rear surface of the front base portion 13 and the front surface of the rear base portion 13, respectively. A pinion gear 14 is meshed with each of the rack gear portions 13a and 13b.

  The grip housing 21 is coupled to the main body housing 11 so as to be relatively displaceable in the driving direction (vertical direction in FIG. 1) and not relatively rotatable around the axis (around the driver shaft described later). The grip portion 20 is provided integrally with the grip housing 21. A switch lever 23 for starting operation is provided on the lower surface of the base portion of the grip portion 20. A battery pack 22 as a power source is attached to the tip of the grip portion 20.

  A driving nose portion 25 is supported on the grip housing 21 so as to be movable up and down within a certain range. The driving nose part 25 is provided integrally with a driver guide 26 protruding in the driving direction from the lower surface of the grip housing 21, a support cylinder part 27 formed integrally with the upper part of the driver guide 26, and an upper part of the support cylinder part 27. An operating cylinder portion 28 is provided. The support cylinder portion 27 is inserted into the lower inner peripheral side of the grip housing 21. The support cylinder portion 27 is supported so as to be displaceable in the driving direction with respect to the grip housing 21. A second compression spring 29 is interposed between the flange portion 27 a of the support cylinder portion 27 and the opening portion 21 a of the grip housing 21. The driving nose portion 25 is urged by the second compression spring 29 in the direction of displacement in the counter driving direction (upward in FIG. 1). A lower limit damper 19 is attached to the inner peripheral side of the support cylinder portion 27 to reduce the impact at the piston lower moving end.

  As shown in FIG. 5, the actuating cylinder portion 28 of the driving nose portion 25 has a cylindrical shape with a rectangular outer surface and a circular inner surface. The inner peripheral hole of the working cylinder portion 28 has a cylinder function for guiding the piston 47 up and down. Rack gear portions 28 a and 28 b are provided on both front and rear side portions of the working cylinder portion 28. Both rack gear portions 28a and 28b are opposed to the rack gear portions 13a and 13b on the main body housing 11 side, respectively. The pinion gear 14 is meshed between the front rack gear portion 13a and the front rack gear portion 28a, and between the rear rack gear portion 13b and the rear rack gear portion 28b. As shown in FIG. 5, both the pinion gears 14 and 14 are rotatably supported by the grip housing 21 via the support shaft 14a. The pinion gears 14 and 14 provided on the grip housing 21 are meshed between the rack gear portions 13a and 13b on the main body housing 11 side and the rack gear portions 28a and 28b on the driving nose portion 25 side, respectively. On the other hand, the tool main body 10 and the driving nose portion 25 move simultaneously by the same distance in the opposite directions with respect to the driving direction or the counter driving direction. The driving nose portion 25 is displaced in the driving direction against the second compression spring 29. The driving nose portion 25 is displaced in the driving direction (downward) as a result of the tool body portion 10 being displaced in the counter driving direction (upward).

  A piston 47 is accommodated in the inner peripheral hole of the operating cylinder portion 28 so as to be vertically displaceable. The outer diameter dimension of the piston 47 is set to a diameter that can be smoothly displaced up and down without rattling with respect to the inner peripheral hole of the actuating cylinder portion 28. In the center of the lower surface of the piston 47, a driver 46 for driving the driving tool is integrally provided. The driver 46 has a thin rod shape that extends long in the driving direction. The front end side of the driver 46 enters the driver guide 26. When one driving tool n supplied into the driver guide 26 is struck by a driver 46 that moves downward, it is ejected from the tip of the driver guide 26 and driven into the driving material W. The driver guide 26 is provided with a magazine 30. The magazine 30 can be loaded with a number of driving tools n to n. In conjunction with the driving operation, driving tools n are supplied from the magazine 30 one by one into the driver guide 26.

  A first compression spring 48 for generating impact force is interposed between the piston 47 and the top plate portion (upper part) of the main body housing 11. The piston 47 is moved downward by the urging force of the first compression spring 48 and the driving tool n is hit by the driver 46. Further, the tool body 10 is displaced in the counter driving direction by the urging force of the first compression spring 48, and the recoil accompanying the downward movement of the piston 47 is absorbed. The piston 47 is integrally provided with an operation plate portion 47a. The operation plate portion 47 a has a circular arc shape along the periphery of the piston 47. The operating plate portion 47 a extends long upward from the upper surface of the piston 47. Two engaging plate portions 47b and 47c are integrally provided on the upper outer surface of the operating plate portion 47a. Both the engaging plate portions 47b and 47c protrude toward the drive mechanism 40 side. The upper first engagement plate portion 47b projects with a smaller dimension than the lower second engagement plate portion 47c. Further, the both engaging plate portions 47b and 47c are displaced at a constant interval in the vertical direction and the horizontal direction (circumferential direction). Therefore, as shown in FIG. 1, the first lift-up roller 42d can be engaged with the upper first engagement plate portion 47b, while the second lift-up roller 43d is not engaged. The first lift-up roller 42d is not engaged with the lower second engagement plate portion 47c, while the second lift-up roller 43d is engageable.

  The piston 47 is moved down by the urging force of the first compression spring 47 to perform a driving operation, and the piston 47 is returned from the lower end position to the upper end position by the operation of the drive mechanism 40. In the process in which the first and second lift-up rollers 42d and 43d are raised during the revolution by the operation of the drive mechanism 40, the piston 47 is engaged with the first engagement plate portion 47b and the second engagement plate portion 47c, respectively, thereby sequentially engaging the first piston 47 with the first engagement plate portion 47b. It rises against the compression spring 48 and finally returns to the initial position shown in FIG. When the piston 47 is returned to the initial position, the electric motor 41 stops. When the switch lever 23 of the grip part 20 is pulled at the initial position shown in FIG. 1, the electric motor 41 is activated and the first lift-up roller 42d is disengaged from the first engagement plate part 47b as shown in FIG. When the first lift-up roller 42d is disengaged from the first engagement plate portion 47b, the piston 47 is moved downward by the urging force of the first compression spring 48 to perform a driving operation. During the driving operation of the driving mechanism 45, the driving mechanism 40 continues to operate.

  As shown in FIG. 3, when the piston 47 reaches the lower moving end and the driving is completed, first, the second lift-up roller 43d is engaged with the lower surface of the second engagement plate portion 47c. The drive mechanism 40 continues to operate in this engaged state to raise the second lift-up roller 43d, so that the piston 47 is pushed up from the lowered position against the second compression spring 48. The drive mechanism 40 continues to operate to shift from the engaged state of the second lift-up roller 43d to the second engagement plate portion 47c to the engaged state of the first lift-up roller 42d to the first engagement plate portion 47b. 47 further rises against the first compression spring 48 and returns to the initial position.

  According to the driving tool 1 of the present embodiment configured as described above, in the initial state shown in FIG. 1, when the switch lever 23 is pulled with the fingertip of the hand holding the grip portion 20, the electric motor 41 is activated and driven. Action is taken. When the electric motor 41 is activated, the first lift-up roller 42d is disengaged from the first engagement plate portion 47b as shown in FIG. 2, and the piston 47 is pressed by the urging force of the first compression spring 48 in FIG. ) Start to move downwards as shown. Further, at this time, the tool body 10 is displaced in the anti-driving direction with respect to the grip housing 21 by the urging force of the first compression spring 48 as shown by the white arrow (C) in FIGS. The reaction that occurs due to the downward movement of the piston 47 between the start of the downward movement of the piston shown in FIG. 2 and the completion of the driving shown in FIG. 3 is first caused by the biasing force of the first compression spring 48. And the displacement of the grip portion 20 and the grip housing 21 in the anti-driving direction is suppressed.

  Further, the grip portion 20 and the grip housing 21 are also deformed as shown by the white arrow (B) in FIGS. 2 and 3 due to the reaction that occurs when the piston 47 reaches the descending end and the driving tool n is driven into the driving material W. Displaces in the driving direction. However, the engagement of the pinion gears 14 and 14 with the rack gear portions 28 a and 28 b is interposed between the driving nose portion 25 and the tool main body portion 10. For this reason, as described above, when the tool main body 10 is displaced in the counter driving direction relative to the grip housing 21 when the piston is moved downward, the meshing position of the pinion gears 14 and 14 with respect to the rack gears 13a and 13a changes. The pinion gears 14 and 14 rotate. Since the meshing positions of the rack gear portions 28a and 28a change due to the rotation of the pinion gears 14 and 14, the driving nose portion 25 is displaced in the driving direction against the second compression spring 29 as a result.

  Thus, the driving nose portion 25 is displaced in the driving direction with respect to the grip housing 21 as a result of the tool body portion 10 being displaced in the counter driving direction (the direction of the white arrow (C)) when the piston is moved downward. For this reason, even if the grip portion 20 and the grip housing 21 are displaced in the counter driving direction (arrow (B) direction) due to the reaction during driving, the tip end (injection port) of the driving nose portion 25 contacts the driving material W. Maintained in contact. Even if the grip portion 20 is displaced in the anti-driving direction due to the reaction when the piston is moved downward or during driving, the injection port of the driving nose portion 25 is maintained in contact with the driving material W. The driving position of the driving tool n does not change, and accurate driving can be realized.

  Various modifications can be made to the embodiment described above. For example, the driving nose portion 25 is relatively displaced in the driving direction with respect to the grip housing 21, and the tool main body portion 10 is displaced in the counter driving direction to reduce or absorb the reaction during driving. Only one of them may be displaceable and the other may not be displaced with respect to the grip housing. The reaction at the time of driving can also be reduced or absorbed by the configuration in which only the driving nose portion 25 is displaced in the driving direction relative to the grip housing or the configuration in which only the tool body portion 10 is displaced in the counter driving direction.

  Moreover, although the rechargeable driving tool 1 using the rechargeable battery pack 22 as a power source has been illustrated, the reaction reduction mechanism illustrated for the driving tool using the AC power source as a power source can be applied. Furthermore, although the electric driving tool 1 using the electric motor 41 as a drive source has been illustrated, the same operation and effect can be obtained by applying the same configuration to the driving tool using compressed air as the drive source.

  6 and 7 show an electric driving tool 50 including a reaction reduction mechanism 70 according to the second embodiment. The driving tool 50 includes a tool main body 51, a loop-shaped grip 52 that a user grips, a driving nose 53 for driving the driving tool, and a magazine 54 that can accommodate a number of driving tools. . Unlike the first embodiment, in the second embodiment, the tool body 51 and the driving nose 53 are fixed to the grip 52. The tool main body 51 houses a drive mechanism 60, a striking mechanism 65, and a reaction reduction mechanism 70. On the inner peripheral side of the grip portion 52, a switch lever 52a that is pulled by a fingertip of a hand held by the user is provided. A battery pack 55 as a power source is attached to the rear portion of the grip portion 52. The battery pack 55 is a secondary battery that can be repeatedly used by being removed and charged with a separately prepared charger. In this embodiment, a slide-mounted lithium ion battery is used.

  The drive mechanism 60 includes an electric motor 56 and two lift-up gears 57 and 59 as a drive source. The electric motor 56 is accommodated in the lower part of the tool main body 51. The first lift up gear 57 is rotated by the electric motor 56. A second lift up gear 59 is engaged with the first lift up gear 57 via an intermediate gear 58. The first lift up gear 57 and the second lift up gear 59 rotate in the same direction. The first lift-up gear 57 and the second lift-up gear 59 are arranged along the driving direction (vertical direction). The rotation center of the first lift-up gear 57 and the rotation center of the second lift-up gear 59 are located on the driving axis J. One lift-up roller is attached to each of the first lift-up gear 57 and the second lift-up gear 59. In FIG. 6, only the first lift-up roller 57a of the first lift-up gear 57 is visible, and the second lift-up roller 59a of the second lift-up gear 59 is not visible (see FIG. 8).

  A striking mechanism 65 and a reaction reduction mechanism 70 are accommodated in front of the drive mechanism 60 in a parallel state on the left and right. 6 and 7, the striking mechanism 65 is accommodated on the left side (right side as viewed from the user), and the reaction reduction mechanism 70 is accommodated on the right side (left side as viewed from the user). The striking mechanism 65 has a first support bar 66, a first compression spring 67, and a first operating base 68. The reaction reduction mechanism 70 includes a second support bar 71, a second compression spring 72, and a second operation base 73. The first and second support bars 66 and 71 are fixed in a state of being spanned between a lower bracket 51b and an upper bracket 51c provided to be fixed to the lower and upper portions of the main body housing 51a of the tool main body 51. . Both support bars 66 and 71 are supported parallel to each other.

  A first operating base 68 is supported on the first support bar 66 so as to be movable in parallel up and down. A second operating base 73 is supported on the second support bar 71 so as to be movable in parallel up and down. A first compression spring 67 is interposed between the first operating base 68 and the upper bracket 51c. The first operating base 68 is urged in the driving direction (downward) by the first compression spring 67. A lower limit damper 66 a made of urethane rubber is attached to the lower part of the first support bar 66. The lower limit damper 66a absorbs an impact when the first operating base 68 reaches the lower end. A second compression spring 72 is interposed between the second operating base 73 and the lower bracket 51b. The second operating base 73 is urged in the counter driving direction (upward) by the second compression spring 72.

  A material thicker than the second compression spring 72 is used for the wire diameter of the first compression spring 67. For this reason, the urging force of the first compression spring 67 (the striking force of the driver 69) is set larger than the urging force of the second compression spring 72. An upper limit damper 71 a made of urethane rubber is attached to the upper part of the second support bar 71. The upper limit damper 71a absorbs an impact when the second operating base 73 reaches the rising end.

  A driver 69 for hitting the driving tool n is attached to the first operating base 68. The driver 69 enters the guide hole of the driving nose portion 53. A path along which the driver 69 moves up and down is the driving axis J. One driving tool supplied from the magazine 54 into the guide hole is struck by the driver 69 and driven out from the tip (injection port 53a) of the driving nose 53.

  The first operating base 68 and the second operating base 73 are each provided with two engaging edges. In FIG. 6, only the engagement edge portions 68a and 68b of the first operation base 68 are visible, and the engagement edge portions 73a and 73b (see FIG. 8) of the second operation base 73 are not visible. FIG. 8 shows the operating state of the striking mechanism 65 and the reaction reduction mechanism 70 by the drive mechanism 60. In FIG. 8, only the first and second lift-up gears 57 and 59 are shown as the drive mechanism 60, and only the first operating base 68 and its engaging edges 68a and 68b are shown as the striking mechanism 65, and the reaction reduction mechanism. Only the second operating base 73 and its engaging edges 73a and 73b are shown as 65.

  As described above, the first lift-up gear 57 and the second lift-up gear 59 rotate in the same direction via the intermediate gear 58. In this embodiment, as shown by the arrows in FIG. FIG. 8A corresponds to the initial state shown in FIG. 6, which is the state when the driver 69 reaches the lower end due to the urging force of the first compression spring 67, and the second operating base 73 is The state at the time of reaching the upper moving end position by the urging force of the second compression spring 72 is shown.

  In the initial state shown in FIG. 6, when the electric motor 56 is activated by the pulling operation of the switch lever 52a, the first and second lift-up gears 57 and 59 rotate in the clockwise direction in FIG. When the first lift-up gear 57 rotates in the clockwise direction, the engagement edge portion 68a is pushed up by the first lift-up roller 57a, so that the first operation base 68 moves up against the first compression spring 67. Therefore, the driver 69 is returned upward. On the other hand, when the second lift-up gear 59 rotates in the clockwise direction, the engagement edge 73b is pushed down by the second lift-up roller 59a, so that the second operation base 59 moves downward against the second compression spring 72. Pushed down.

  As shown in FIG. 8 (B), the first and second lift-up gears 57 and 59 continue to rotate in the clockwise direction, whereby the first operating base 68 moves up against the first compression spring 67. The second operating base 73 moves downward against the second compression spring 72. When the stage shown in FIG. 8C is followed by the stage shown in FIG. 8D, the first lift-up roller 57a is moved from the lower surface of the lower engaging edge 68a of the first operating base 68 to the second operating base 73. It moves to the upper surface of the lower engaging edge 73a. At the same time, the second lift-up roller 59 a moves from the upper surface of the upper engagement edge 73 b of the second operation base 73 to the lower surface of the upper engagement edge 68 b of the first operation base 68. Accordingly, the first operating base 68 is continuously pushed up by the second lift up roller 59a and the driver 69 is returned upward, while the second operating base 73 is pushed down by the first lift up roller 57a.

  As the first lift up gear 57 and the second lift up gear 59 continue to rotate in the clockwise direction, the first operating base 68 is moved to the rising end position by the second lift up roller 59a as shown in FIG. The second operating base 73 is pushed down to the lower end by the first lift up roller 57a. In the stage shown in FIG. 8E, the second lift-up roller 59a is just before the second lift-up roller 59a is disengaged from the lower surface of the upper engagement edge 68b of the first operation base 68, and the first lift-up roller 57a is in the second operation. It is in a state immediately before it is disengaged from the upper surface of the lower engaging edge 73a of the base 73. Therefore, when the first lift-up gear 57 and the second lift-up gear 59 are further rotated in the clockwise direction thereafter, the first lift-up roller 57a is moved under the second operation base 73 as shown in FIG. The second lift-up roller 59a is disengaged from the lower surface of the upper engaging edge 68b of the first operating base 68 at the same time. When the first lift-up roller 57 a is disengaged from the engaging edge 73 a of the second operation base 73, the second operation base 73 moves upward by the urging force of the second compression spring 72. At the same time, the second lift-up roller 59a is disengaged from the lower surface of the engagement edge 68b of the first operation base 68, so that the first operation base 68 is moved downward by the urging force of the first compression spring 67. As a result, the driver 69 is moved down and the driving tool in the driving nose portion 53 is hit and driven out from the injection port 53a.

  Thus, the first operating base 68 moves downward, the first lift-up roller 57a comes into contact with the lower surface of the lower engaging edge 68a, and the first operating base 68 reaches the descending end, and FIG. The initial position shown in FIG. Further, the second operating base 73 moves upward, the second lift-up roller 59a comes into contact with the upper surface of the upper engaging edge 73b, and the second operating base 73 reaches the upper moving end, as shown in FIG. Return to the initial position. Thus, a series of driving operations of the driving tool 1 is completed.

  According to the driving tool 50 according to the second embodiment configured as described above, when the first operating base 68 is moved down and driven, the second operating base 73 moves up in the opposite direction by substantially the same distance. Move. Accordingly, the reaction caused by the driving operation of the driving tool by the driver 69 is absorbed or reduced by the second operating base 73 moving up by the urging force of the second compression spring 72.

  As described above, according to the driving tool 50 of the second embodiment, the second operating base 73 is displaced in the counter driving direction by the urging force of the second compression spring 72 instead of the configuration of reducing the reaction by the conventional moving pulley mechanism. By providing the reaction reducing portion 70 configured to reduce the reaction at the time of driving, the durability of the driving tool 50 and the driving tool 50 can be improved.

  Furthermore, since the striking mechanism 65 and the recoil reduction mechanism 70 are arranged at positions that are substantially bilaterally symmetrical with respect to the driving axis J, the right and left dynamic balance when driving the driving tool 50 can be properly taken. it can.

  Various modifications can be made to the second embodiment described above. For example, the rechargeable driving tool 50 that uses a rechargeable battery pack 55 (secondary battery) as a power source has been illustrated, but the same applies to the driving tool that uses an AC power source as a power source by applying the illustrated reaction reduction mechanism 70. The effect of this can be obtained. Further, the present invention is not limited to an electric driving tool using an electric motor as a driving source, but can be similarly applied to a driving tool using compressed air as a driving source.

1 ... Driving tool (first embodiment)
n ... Driving tool 10 ... Tool body 11 ... Body housing 12 ... Motor housing 13 ... Base part, 13a, 13b ... Rack gear part 14 ... Pinion gear 19 ... Lower limit damper 20 ... Grip part 21 ... Grip housing, 21a ... Opening 22 ... battery pack 23 ... switch lever 25 ... driving nose part 26 ... driver guide 27 ... support cylinder part, 27a ... flange part 28 ... actuating cylinder part, 28a, 28b ... rack gear part 29 ... second compression spring 30 ... magazine 40 ... drive Mechanism 41 ... Electric motor, 41a ... Drive gear 42 ... First lift-up gear 42a ... Drive gear, 42b ... Bearing, 42c ... First shaft, 42d ... First lift-up roller d1 ... Eccentric distance 43 of first lift-up roller ... second lift-up gear 43b ... bearing, 43c ... second shaft, 43d ... second lifter 2nd lift-up roller eccentric distance 45 ... Stroke mechanism 46 ... Driver 47 ... Piston 47a ... Actuating plate portion, 47b ... First engaging plate portion, 47c ... Second engaging plate portion 48 ... First compression spring 50 ... Driving tool (second embodiment)
51 ... Tool body 51a ... Main body housing, 51b ... Lower bracket, 51c ... Upper bracket 52 ... Grip part, 52a ... Switch lever 53 ... Pushing nose, 53a ... Injection port 54 ... Magazine 55 ... Battery pack 56 ... Electric motor 57 ... 1st lift up gear, 57a ... 1st lift up roller 58 ... Intermediate gear 59 ... 2nd lift up gear, 59a ... 2nd lift up roller 60 ... Drive mechanism 65 ... Blowing mechanism 66 ... 1st support bar, 66a ... Lower limit damper 67 ... first compression spring 68 ... first operating base 68a ... engagement edge (lower side), 68b ... engagement edge (lower side)
69 ... Driver J ... Driving axis 70 ... Reaction reduction mechanism 71 ... Second support bar, 71a ... Upper limit damper 72 ... Second compression spring 73 ... Second operation base 73a ... Engagement edge (lower side), 73b ... Engagement Edge (upper side)

Claims (5)

A grip housing integrally having a grip portion to be gripped by a user, and a tool main body portion supported to be displaceable in the driving direction independently of each other with respect to the grip housing and biased in the counter driving direction; A driving tool provided with a driving nose part and a driver for driving the driving tool guided by the driving nose part,
A driving tool in which the driving nose portion is displaced in the driving direction against the urging force when the driver moves in the driving direction. The driving tool according to claim 1, wherein when the driver moves in the driving direction, the tool main body portion is displaced in the counter driving direction by the biasing force. 3. The driving tool according to claim 2, wherein a compression spring is interposed between the driver and the tool main body portion to bias the tool main body portion in a counter driving direction. The driving tool according to any one of claims 1 to 3, wherein the driving nose part and the tool main body part are simultaneously displaced in directions opposite to each other. 5. The driving tool according to claim 4, wherein a pinion gear is provided in the grip housing, a rack gear portion is provided in each of the driving nose portion and the tool main body portion, and the pinion gear is sandwiched between the both rack gear portions. A driving tool configured such that the driving nose portion and the tool main body portion are simultaneously displaced in opposite directions by meshing in a state.

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