Contracting Tools

Abstract

To provide a fastening tool configured to electrically control movement amounts along an axial direction of a driver bit.SOLUTION: A fastening tool 1 comprises: a bit moving motor 50 that moves, along an axial direction of the driver bit, a holding member which holds a driver bit rotatably and movably in a longitudinal direction along the axial direction; a setting part 110 that sets movement amounts along the axial direction of the driver bit; and a control part 100 that controls a rotation speed of the driver bit moving motor 50, on the basis of a set value that is set by the setting part 110, of the movement amounts along the axial direction of the driver bit.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a fastening tool in which a driver bit is engaged with a screw, the screw is pressed against an object to be fastened by the driver bit, and the driver bit is rotated to screw in the screw. [Background technology]

[0002] A portable tool known as a driving machine is known that uses the air pressure of compressed air supplied from an air compressor or the combustion pressure of gas to drive connecting fasteners loaded in a magazine one after another from the tip of a driver guide.

[0003] As a driving machine that utilizes the combustion pressure of gas, there is a driving machine that has a small gas cylinder mounted on the driving machine body and can be used cordlessly, and a screw driving machine that uses a screw as the connecting fastener to be driven has been proposed (see, for example, Patent Document 1).

[0004] Also, a screw driver has been proposed in which a spring is compressed by the driving force of a motor that rotates the screw, and the screw is driven in by the biasing force of the spring (see, for example, Patent Document 2).

[0005] In impact tools that use the combustion pressure of gas or the air pressure of compressed air to drive screws and the like, it is not easy to adjust the operating range of the piston, so the driving depth is adjusted by adjusting the distance between the tool body and the object being driven, and a driving depth adjustment device has been proposed that makes it possible to adjust the height (protrusion length) of the push lever that is pressed against the object being driven (see, for example, Patent Document 3).

[0006] Furthermore, the adjustment mechanism that adjusts the driving depth is mechanically connected to a component called a push lever or contact arm that is pressed against the object being driven into, and therefore needs to be placed close to the contact arm. However, a contact arm guide mechanism has been proposed in which this adjustment mechanism is placed on the side of the nose portion, preventing deformation of the contact arm (see, for example, Patent Document 4).

[0007] Furthermore, for screw tightening machines that do not have a driver bit advancement mechanism, an automatic drive motor stop mechanism has been proposed that includes a switching plate that is associated with the adjustment rod and switching rod and turns off the drive motor start switch when the screw reaches a predetermined screw-in depth due to the backward movement of the nose section, mechanically turning off the switch and stopping the rotation of the driver bit (see, for example, Patent Document 5). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 5590505 [Patent Document 2] Patent No. 6197547 [Patent Document 3] Utility Model Application No. 3-47781 [Patent Document 4] JP 2002-346947 A [Patent Document 5] Japanese Patent Application Publication No. 7-266246 Summary of the Invention [Problem to be solved by the invention]

[0009] A configuration that allows the contact arm's protrusion length to be mechanically adjusted increases the number of parts and weight. Furthermore, the range over which the contact arm's protrusion length can be adjusted is narrow, limiting the precision of the adjustment. Furthermore, in impact tools that use gas combustion pressure or compressed air pressure to drive screws, the forward position of the piston that advances the driver bit is restricted by an elastic material such as rubber, resulting in unstable driving depth due to external factors such as the ambient temperature and the temperature of the elastic material. Furthermore, the location where the adjustment mechanism can be placed is limited to the vicinity of the nose, resulting in a larger tip end of the tool. Furthermore, the location of the dial or other control for operating the adjustment mechanism is limited to the vicinity of the nose, making it difficult to optimize the operability of depth adjustment.

[0010] The present invention has been made to solve such problems, and has an object to provide a fastening tool in which the amount of movement of the driver bit along the axial direction can be electrically controlled. [Means for solving the problem]

[0011] In order to solve the above-mentioned problems, the present invention provides a bit holding section having a holding member that holds a driver bit rotatably and movably in the axial direction, and a driver bit held by the holding member at the bit holding section. only a first drive unit having a first motor for rotating the No. A second motor different from the first motor is provided. By moving the driver bit only along the axial direction by the rotation of the second motor, the amount of movement of the driver bit in the axial direction can be controlled by the amount of rotation of the second motor. The second drive unit and the control unit that controls the amount of movement of the driver bit along the axial direction by the amount of rotation of the second motor are provided, and the control unit controls the load applied to the first motor, the rotation of the first motor, and the like in conjunction with the operation of rotating the driver bit with the first motor to screw the screw into the object to be fastened. amount , the load on the second motor, and the rotation of the second motor. amount Based on this, the fastening tool is configured to move the driver bit forward using the second motor, so that the amount of movement of the driver bit along the axial direction follows the screw being screwed into the object to be fastened, and to stop the advancing driver bit at a preset stopping position by controlling the amount of rotation of the second motor.

[0012] In the present invention, the driver bit held by the holding member at the bit holding section is moved along the axial direction by the second motor, and the amount of movement along the axial direction is controlled by the amount of rotation of the second motor. [Effects of the Invention]

[0013] In the present invention, the axial movement of the driver bit can be controlled by the rotational speed of the motor that moves the driver bit axially. This reduces the number of mechanical parts and the weight. Furthermore, since the mechanical adjustment mechanism is not located near the nose, the tool tip can be kept small, making it easier to visually confirm the screw driving position. Furthermore, the range over which the axial movement of the driver bit can be adjusted can be widened, improving the accuracy of screw driving depth adjustment. Furthermore, since the driver bit's forward position is not restricted by an elastic member such as rubber, the influence of external factors such as the ambient temperature or the temperature of the elastic member is reduced, resulting in a stable screw driving depth. Furthermore, since the axial movement of the driver bit can be set using an electrical signal, there are fewer restrictions on the placement of the means for setting the movement, making it easy to optimize screw driving depth adjustment for ease of use. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a side cross-sectional view showing an example of the internal structure of the fastening tool of the present embodiment. [Figure 2A] 1 is a partially cutaway perspective view showing an example of the internal structure of a fastening tool according to an embodiment of the present invention. [Figure 2B] 1 is a partially cutaway perspective view showing an example of the internal structure of a fastening tool according to an embodiment of the present invention. [Figure 2C] 1 is a partially cutaway perspective view showing an example of the internal structure of a fastening tool according to an embodiment of the present invention. [Figure 3A] FIG. 2 is a side view showing an example of the fastening tool of the present embodiment. [Figure 3B] 1 is a front view showing an example of a fastening tool according to an embodiment of the present invention; [Figure 3C] FIG. 2 is a top view showing an example of the fastening tool of the present embodiment. [Figure 4A] FIG. 1 is a perspective view showing an example of a fastening tool according to an embodiment of the present invention. [Figure 4B] FIG. 1 is a perspective view showing an example of a fastening tool according to an embodiment of the present invention. [Figure 5]FIG. 2 is a perspective view showing details of a screw feed unit according to the present embodiment. [Figure 6A] FIG. 2 is a perspective view showing an example of a nose portion of the present embodiment. [Figure 6B] FIG. 2 is a perspective view showing an example of a nose portion of the present embodiment. [Figure 7] 10A and 10B are side cross-sectional views showing an example of the operation of the fastening tool of the present embodiment. [Figure 8A] FIG. 2 is a partially cutaway perspective view showing an example of the operation of the fastening tool according to the present embodiment. [Figure 8B] FIG. 2 is a partially cutaway perspective view showing an example of the operation of the fastening tool according to the present embodiment. [Figure 9A] 10 is a perspective view showing an example of an attachment / detachment operation of a driver bit in the fastening tool of the present embodiment. FIG. [Figure 9B] 10 is a perspective view showing an example of an attachment / detachment operation of a driver bit in the fastening tool of the present embodiment. FIG. [Figure 10A] FIG. 10 is a side cross-sectional view showing a modified example of the fastening tool of the present embodiment. [Figure 10B] FIG. 10 is a side cross-sectional view showing another modified example of the fastening tool of the present embodiment. [Figure 11] FIG. 10 is a block diagram showing a modified example of the fastening tool of the present embodiment. [Figure 12A] FIG. 4 is a cross-sectional view showing a fastened state of the screw. [Figure 12B] FIG. 4 is a cross-sectional view showing a fastened state of the screw. [Figure 12C] FIG. 4 is a cross-sectional view showing a fastened state of the screw. [Figure 13] FIG. 4 is a plan view illustrating an example of a setting unit. [Figure 14] 10 is a flowchart showing an example of the operation of a fastening tool according to a modified example of the present embodiment. [Figure 15A] FIG. 10 is a perspective view showing a modified example of the installation position of the setting unit. [Figure 15B] FIG. 10 is a perspective view showing a modified example of the installation position of the setting unit. [Figure 15C] FIG. 10 is a perspective view showing a modified example of the installation position of the setting unit. [Figure 15D]FIG. 10 is a perspective view showing a modified example of the installation position of the setting unit. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the fastening tool of the present invention will be described with reference to the drawings.

[0016] <Configuration example of fastening tool according to this embodiment> Fig. 1 is a side cross-sectional view showing an example of the internal structure of a fastening tool of this embodiment, and Figs. 2A to 2C are partially cutaway perspective views showing an example of the internal structure of the fastening tool of this embodiment. Fig. 3A is a side view showing an example of the fastening tool of this embodiment, Fig. 3B is a front view showing an example of the fastening tool of this embodiment, and Fig. 3C is a top view showing an example of the fastening tool of this embodiment. The cross section in Fig. 1 is taken along line AA in Fig. 3B. Furthermore, Figs. 4A and 4B are perspective views showing an example of the fastening tool of this embodiment.

[0017] The fastening tool 1 of this embodiment includes a tool body 10 and a handle 11. The fastening tool 1 has the handle 11 extending in a direction that intersects with the extension direction of the tool body 10, which extends in one direction. The fastening tool 1 defines the direction in which the tool body 10 extends as the front-rear direction and the direction in which the handle 11 extends as the up-down direction. The fastening tool 1 also includes a battery attachment portion 13 at the bottom of the handle 11 to which a battery 12 is detachably attached.

[0018] The fastening tool 1 includes a bit holding portion 3 that holds a driver bit 2 rotatably and movable in the forward and backward directions along the axial direction, a first drive portion 4 that rotates the driver bit 2 held by the bit holding portion 3, and a second drive portion 5 that moves the driver bit 2 held by the bit holding portion 3 in the forward and backward directions along the axial direction.

[0019] The fastening tool 1 also includes a screw storage section 6 in which the screw 200 is stored, and a screw storage section Delivery The screw feeder 7 feeds the screws stored in the screw feeder 6, and the nose 8 is pressed against the object to be fastened and ejects the screws.

[0020] The bit holding portion 3 comprises a holding member 30 that detachably holds the driver bit 2, a rotation guide member 31 that supports the holding member 30 so that the holding member 30 can move in the front-rear direction along the axial direction of the driver bit 2 and rotates together with the holding member 30, and a rotate The moving member 32 is provided to move in the front-rear direction along the guide member 31, and the biasing member 33 is provided to bias the moving member 32 in the rear direction.

[0021] The holding member 30 is configured as, for example, a cylindrical member whose outer diameter is slightly smaller than the inner diameter of the rotation guide member 31 and which can be inserted inside the rotation guide member 31. The holding member 30 has an opening 30a at its front end along the axial direction, the opening 30a having a shape that matches the cross-sectional shape of the insertion portion 20 of the driver bit 2. The holding member 30 is provided with a mechanism in the opening 30a that detachably holds the insertion portion 20 of the driver bit 2 using a known mechanism. The opening 30a of the holding member 30 is exposed to the inside of the rotation guide member 31, and the insertion portion 20 of the driver bit 2 is detachably inserted into the opening 30a.

[0022] The rotation guide member 31 extends in the extension direction of the tool body 10 and has a cylindrical shape inside which the holding member 30 fits, and its front end is rotatably supported via a bearing 34a on a metal front frame 10b provided on the front side of a resin case 10a that forms the exterior of the tool body 10. In addition, the rotation guide member 31 has its rear end connected to the first drive unit 4.

[0023] The rotation guide member 31 has grooves 31a formed in two radially opposing sides, the grooves 31a extending in the front-to-rear direction along the axial direction of the driver bit 2. The rotation guide member 31 penetrates the holding member 30 in the radial direction, and connecting members 30b protruding from both sides of the holding member 30 enter the grooves 31a, thereby connecting the rotation guide member 31 to the holding member 30 via the connecting members 30b.

[0024] As a result, when the rotation guide member 31 rotates, the connecting member 30b is pressed into the groove portion 31a of the rotation guide member 31, causing the holding member 30 to rotate together with the rotation guide member 31. Furthermore, the connecting member 30b is guided by the groove portion 31a of the rotation guide member 31, and the holding member 30 moves in the front-to-rear direction along the axial direction of the driver bit 2.

[0025] The moving member 32 is an example of a transmission member, and includes a first moving member 32a that rotates together with the holding member 30 and moves the holding member 30 in the forward and backward directions along the rotation guide member 31, a second moving member 32c that is supported by the first moving member 32a via a bearing 32b and pushes the first moving member 32a with the bearing 32b, and a buffer member 32d that is attached to the rear side of the second moving member 32c.

[0026] The first moving member 32a has an inner diameter slightly larger than the outer diameter of the rotation guide member 31 and is configured as, for example, a cylindrical member that is placed on the outside of the rotation guide member 31. The first moving member 32a is connected to the holding member 30 via a connecting member 30b that protrudes from the groove portion 31a of the rotation guide member 31.

[0027] The bearing 32b is inserted between the outer periphery of the first moving member 32a and the inner periphery of the second moving member 32c, and supports the first moving member 32a rotatably relative to the second moving member 32c.

[0028] The second moving member 32c is connected to the first moving member 32a via a bearing 32b in a state in which movement in the front-rear direction along the axial direction is restricted.

[0029] As a result, when the second moving member 32c moves back and forth along the axial direction, the first moving member 32a is pushed by the second moving member 32c via the bearing 32b, and moves back and forth along the axial direction together with the second moving member 32c. In addition, the first moving member 32a is rotatable relative to the second moving member 32c.

[0030] The biasing member 33, in this example, is formed by a coil spring, and is placed outside the rotation guide member 31 between the front frame 10b provided on the front side of the case 10a of the tool body 10 and the second moving member 32c of the moving member 32, and abuts against a spring seat arranged so as to contact the end face of the outer ring of the bearing 32b. The biasing member 33 is compressed when the moving member 32 moves forward, and applies a force to the moving member 32 that pushes it backward.

[0031] The first drive unit 4 includes a bit rotation motor 40 driven by electricity supplied from the battery 12, and a reducer 41. The bit rotation motor 40 is an example of a first motor, and a shaft 40a of the bit rotation motor 40 is connected to the reducer 41, and a shaft 41a of the reducer 41 is connected to the rotation guide member 31. In the first drive unit 4, the reducer 41 is configured using a planetary gear, and the bit rotation motor 40 is arranged coaxially with the rotation guide member 31 and the driver bit 2 held by the holding member 30.

[0032] The first drive unit 4 has a bit rotation motor 40 and a reducer 41 attached to a metal rear frame 10c provided on the rear side of the case 10a of the tool body 10, and the shaft 41a of the reducer 41 is supported on the rear frame 10c via a bearing 42.

[0033] The bit holding unit 3 and the first drive unit 4 are assembled into a unit by connecting the front frame 10b and the rear frame 10c with a connecting member 10d extending in the front-to-rear direction, and are fixed to the case 10a of the tool body 10 with screws 10e. The bit holding unit 3 and the first drive unit 4 are configured so that they can be attached to and detached from the tool body 10 in an assembled state, which improves assembly ease, as opposed to a configuration in which each part is fixed to the tool body 10 independently.

[0034] Furthermore, the front end of the rotation guide member 31 of the bit holding part 3 is supported via a bearing 34a on a front frame 10b provided on the front side of the case 10a of the tool body 10, and the rear end of the rotation guide member 31 is supported via a shaft 41a of the reducer 41 and a bearing 42 on a rear frame 10c provided on the rear side of the case 10a. Thus, the rotation guide member 31 of the bit holding part 3 is rotatably supported on the tool body 10.

[0035] As a result, the first driving unit 4 rotates the rotary guide member 31 using the bit rotation motor 40. When the rotary guide member 31 rotates, the holding member 30 that holds the driver bit 2 rotates together with the rotary guide member 31 as the connecting member 30b is pressed into the groove portion 31a of the rotary guide member 31.

[0036] The second drive unit 5 includes a bit moving motor 50 driven by electricity supplied from the battery 12, and a reducer 51. The bit moving motor 50 is an example of a motor or second motor, and a shaft 50a of the bit moving motor 50 is connected to the reducer 51, and a shaft 51a of the reducer 51 is connected to a pulley 52, which is an example of a transmission member. In the second drive unit 5, the pulley 52 is supported on the tool body 10 via a bearing 53. In the second drive unit 5, the shaft 50a of the bit moving motor 50 is arranged along the extension direction of the handle 11.

[0037] In the second driving unit 5, a wire 54, which is an example of a transmission member, is wound around a pulley 52, and the wire 54 is connected to the second moving member 32c of the moving member 32.

[0038] As a result, the second drive unit 5 rotates the pulley 52 using the bit moving motor 50 to wind up the wire 54, thereby moving the second moving member 32c forward. In the bit holding unit 3, the forward movement of the second moving member 32c pushes the first moving member 32a via the bearing 32b, and the first moving member 32a moves forward in the axial direction together with the second moving member 32c. The forward movement of the first moving member 32a moves the holding member 30, which is connected to the first moving member 32a via the connecting member 30b, forward.

[0039] The second drive unit 5 is disposed offset to one side from approximately the center in the left-right direction of the fastening tool 1 so that the tangent direction of the portion of the pulley 52 around which the wire 54 is wound is along the extension direction of the rotation guide member 31. This causes the wire W between the pulley 52 and the second moving member 32c to extend linearly along the movement direction of the moving member 32, suppressing an increase in load when the wire 54 is wound around the pulley 52 and when the wire W is pulled out from the pulley 52.

[0040] The first drive unit 4 is provided on one side of the tool body 10, i.e., the rear side, across the handle 11. The second drive unit 5 is provided on the other side of the tool body 10, i.e., the front side, across the handle 11.

[0041] The screw storage section 6 stores a plurality of screws 200 connected by a connecting band and wound spirally.

[0042] 5 is a perspective view showing the screw feed unit of this embodiment in detail. The screw feed unit 7 includes a screw feed motor 70, a pinion gear 71 attached to the shaft of the screw feed motor 70, a rack gear 72 meshing with the pinion gear 71, and a screw feed mechanism connected to the rack gear 72. DeliveryThe screw feed motor 70 includes an engaging portion 73 that engages with a connecting screw fed from the screw feed motor 70. The screw feed motor 70 includes a pinion gear 71 and a rack gear 72, which constitute a screw feed transmission portion that transmits the driving force of the screw feed motor 70 to the engaging portion 73. The engaging portion 73 is biased upward by a compression spring (not shown) via the part in which the rack gear 72 is formed, and is configured so that the engaging portion 73 and the screw 200 do not descend due to their own weight when power is not supplied to the screw feed motor 70.

[0043] In the screw feed unit 7, a screw feed motor 70 is fixed to a subframe 74, and a rack gear 72 is supported by the subframe 74 so as to be movable up and down along the feed direction of the connecting screws. The screw feed unit 7 is unitized by assembling each part into one unit by fitting together concave and convex shapes such as claws, fastening screws 75, etc.

[0044] 6A and 6B are perspective views showing an example of a nose portion of this embodiment. Nose portion 8 is an example of a first nose portion, and includes an injection passageway forming portion 80a through which screws 200 are supplied by screw feed portion 7 and which forms injection passageway 80 through which driver bit 2 passes, a contact member 81 having an injection port 81a communicating with injection passageway 80 and which comes into contact with an object to be fastened, a contact arm 82 which moves in the front-to-rear direction in conjunction with contact member 81, and an adjustment portion 83 which regulates the amount of movement of contact arm 82. Nose portion 8 also includes a cover member 88 which openably and closably covers the path through which screws 200 pass from screw storage portion 6 to injection passageway 80.

[0045] As shown in FIG. 2C, the fastening tool 1 includes a contact switch section 84 that is activated when pressed by a contact arm 82. As shown in FIG. 1A, the fastening tool 1 also includes a nose main body section 10f on the tool body 10, which includes an injection passageway component 80b that configures the injection passageway 80 in combination with the injection passageway component 80a of the nose section 8. The nose main body section 10f is an example of a second nose section, and is configured integrally with the front frame 10b, for example. Note that the nose main body section 10f may also be configured such that a component separate from the front frame 10b is fixed to the front frame 10b.

[0046] The nose portion 8 supports the contact member 81 so that it can move in the front-rear direction, and the contact arm 82 moves in the front-rear direction in conjunction with the contact member 81. The contact member 81 of the nose portion 8 is biased forward by a biasing member (not shown), and the contact member 81, which is pressed against the object to be fastened and moves rearward, is then biased by the biasing member and moves forward.

[0047] In the nose portion 8, the contact member 81 is pressed against the object to be fastened, causing the contact arm 82 to move rearward, and the amount of movement of the contact arm 82 until the contact switch portion 84 is activated is adjusted by the adjustment portion 83. The contact switch portion 84 is switched between activated and inactivated when pressed by the contact arm 82, and in this example, the state in which the contact switch portion 84 is not pressed by the contact arm 82 and is inactivated is referred to as the off state of the contact switch portion 84, and the state in which the contact switch portion 84 is pressed by the contact arm 82 and is activated is referred to as the on state of the contact switch portion 84.

[0048] The nose portion 8 is configured such that the components constituting the injection passage 80, the contact member 81, and the contact arm 82 are fitted together by means of claws or other concave and convex shapes, fastening screws 85, etc. Risa The nose section 8 is assembled to a back frame 86 to form a unit, which is then fixed to the front frame 10b that constitutes the tool body 10 with screws 87. When the nose section 8 is fixed to the front frame 10b, the injection passage 80 is formed by the injection passage forming portion 80b of the nose main body section 10f that is fixed to the tool body 10 side, and the injection passage forming portion 80a that is a part on the nose section 8 side.

[0049] The subframe 86, which has the function of fixing the nose portion 8 to the tool body 10, has an injection passageway forming portion 80a that forms part of the injection passageway 80 formed therein, and also has the function of positioning the injection passageway 80 with respect to the tool body 10. As a result, when the nose portion 8 is fixed to the front frame 10b, the injection passageway forming portion 80a is correctly aligned, and even if the nose portion 8 is configured to be detachable from the tool body 10, displacement of the injection passageway 80, particularly in the radial direction, with respect to the movement path of the driver bit 2 is suppressed. In addition, the contact switch unit 84 is attached to the tool body 10, and when the nose portion 8 is fixed to the front frame 10b, the side of the contact arm 82 facing the contact switch unit 84 is positioned in alignment with the contact switch unit 84.

[0050] The screw feed unit 7 is configured integrally with the front frame 10b, or b , the sub-frame 74 is fixed to the nose body portion 10f constituting the tool body 10 by the screws 76.

[0051] The fastening tool 1 includes a trigger 9 that is operated, and a trigger switch unit 90 that is actuated by operating the trigger 9. The trigger 9 is provided on the front side of the handle 11 and is configured to be operable by the finger of the hand holding the handle 11. The trigger switch unit 90 is actuated when pressed by the trigger 9.

[0052] The trigger switch unit 90 is switched between activated and inactive when pressed by the trigger 9. In this example, the trigger switch unit 90 is in an inactive state when the trigger 9 is not operated and the trigger 9 does not press the trigger switch unit 90, and is in an off state when the trigger 9 is operated and pressed by the trigger 9, causing the trigger switch unit 90 to be activated.

[0053] The fastening tool 1 includes a control unit 100 that controls the first drive unit 4, the second drive unit 5, and the screw feed unit 7 based on the outputs of a trigger switch unit 90 that is actuated by operating a trigger 9 and a contact switch unit 84 that is actuated by being pressed by a contact member 81. In this example, the control unit 100 is installed inside a battery attachment unit 13 that is provided at the bottom of the handle 11.

[0054] <Example of operation of the fastening tool according to this embodiment> FIG. 7 is a side cross-sectional view showing an example of the operation of the fastening tool of this embodiment, and FIGS. 8A and 8B are partially cutaway perspective views showing an example of the operation of the fastening tool of this embodiment. Below, the fastening operation of the fastening tool of this embodiment will be described with reference to each drawing.

[0055] In the fastening tool 1, in the standby state, as shown in FIG. 1, the tip of the driver bit 2 is located at a standby position P1 behind the injection passage 80, and the screw 200 can be supplied to the injection passage 80.

[0056] When the contact member 81 is pressed against the object to be fastened, the contact arm 82 presses the contact switch unit 84 to turn it on, and the trigger 9 is operated to turn the trigger switch unit 90 on, the control unit 100 drives the bit movement motor 50 of the second drive unit 5 and also drives the bit rotation motor 40 of the first drive unit 4 at a predetermined timing.

[0057] When the bit moving motor 50 is driven to rotate in one direction, which is the forward direction, the pulley 52 rotates in the forward direction, causing the wire 54 to be wound around the pulley 52. ​​As the wire 54 is wound around the pulley 52, the second moving member 32c connected to the wire 54 moves forward in the axial direction, guided by the rotation guide member 31. When the second moving member 32c moves forward, the first moving member 32a is pushed by the second moving member 32c via the bearing 32b, and moves forward in the axial direction together with the second moving member 32c while compressing the biasing member 33.

[0058] When the first moving member 32a moves forward, the holding member 30 connected to the first moving member 32a by the connecting member 30b moves forward along the axial direction of the driver bit 2, with the connecting member 30b being guided by the groove portion 31a of the rotating guide member 31.

[0059] As a result, the driver bit 2 held by the holding member 30 moves forward, and the injection port 8 of the nose portion 8 1a The screw 200 is engaged with the screw 200 supplied to the screw hole 201, and the screw 200 is moved forward and pressed against the object to be fastened.

[0060] When the bit rotation motor 40 is driven to rotate in one direction, that is, the forward direction, the rotation guide member 31 rotates in the forward direction. When the rotation guide member 31 rotates in the forward direction, the connecting member 30b connected to the holding member 30 is pressed against the groove portion 31a of the rotation guide member 31, causing the holding member 30 to rotate together with the rotation guide member 31.

[0061] As a result, the driver bit 2 held by the holding member 30 rotates the screw 200 in the forward direction (clockwise) and screws it into the object to be fastened. The control unit 100, in conjunction with the operation of the first drive unit 4 to rotate the driver bit 2 and screw the screw into the object to be fastened, calculates the second rotation speed of the bit rotation motor 40 based on the load applied to the bit rotation motor 40, the rotation speed of the bit rotation motor 40, the load applied to the bit movement motor 50, the rotation speed of the bit movement motor 50, etc. 2 The driver bit 2 is moved forward by the driving unit 5, so that the driver bit 2 follows the screw being screwed into the object to be fastened.

[0062] 7, when the tip of the driver bit 2 protrudes from the ejection port 81a of the contact member 81 and reaches a predetermined operation end position P2, the control unit 100 stops driving the bit rotation motor 40 and reverses the rotation of the bit moving motor 50. The control unit 100 may determine that the tip of the driver bit 2 has reached the operation end position P2 based on the rotation speed of the bit moving motor 50, or may vary the operation end position P2 based on the load on the bit rotation motor 40, the rotation speed of the bit rotation motor 40, the load on the bit moving motor 50, the rotation speed of the bit moving motor 50, etc.

[0063] When the bit moving motor 50 rotates in the other direction, that is, the reverse direction, the pulley 52 rotates in the reverse direction, causing the wire 54 to be pulled out from the pulley 52. ​​When the wire 54 is pulled out from the pulley 52, the second moving member 32c moves forward, causing the compressed biasing member 33 to expand and push the second moving member 32c rearward.

[0064] The second moving member 32c is pushed rearward by the biasing member 33, and moves rearward along the axial direction while being guided by the rotation guide member 31. When the second moving member 32c moves rearward, the first moving member 32a is pulled by the second moving member 32c via the bearing 32b, and moves rearward along the axial direction together with the second moving member 32c.

[0065] When the first moving member 32a moves rearward, the holding member 30 connected to the first moving member 32a by the connecting member 30b moves rearward along the axial direction of the driver bit 2, with the connecting member 30b being guided by the groove portion 31a of the rotating guide member 31.

[0066] As a result, the driver bit 2 held by the holding member 30 moves rearward, and the tip of the driver bit 2 returns to the standby position P1. The moving member 32 includes a buffer member 32d made of rubber or the like on the rear side of the second moving member 32c. This prevents the second moving member 32c from directly hitting the rear frame 10c when the second moving member 32c moves rearward, thereby reducing noise and damage. When the second moving member 32c is pushed rearward by the biasing member 33 and the tip of the driver bit 2 returns to the standby position P1, the control unit 100 stops the rotation of the bit moving motor 50. When the trigger switch 90 is turned off, the control unit 100 rotates the screw feed motor 70 in one direction to lower the engagement portion 73. When the engaging portion 73 descends to a position where it engages with the next screw 200 , the control portion 100 reverses the screw feed motor 70 to raise the engaging portion 73 and supply the next screw 200 to the supply passage 80 .

[0067] The fastening tool 1 has a battery 12 detachably attached to a battery attachment part 13 provided on a handle 11, and is equipped with a first drive part 4 that rotates a driver bit 2 with a bit rotation motor 40 driven by electricity supplied from the battery 12, and a second drive part 5 that moves the driver bit 2 back and forth along the axial direction with a bit movement motor 50 driven by electricity supplied from the battery 12. This eliminates the need to connect a hose as with pneumatically driven fastening tools, improving workability.

[0068] Furthermore, by providing the fastening tool 1 with the second drive unit 5 that moves the driver bit 2 back and forth along the axial direction, it is possible to fasten a screw without moving the fastening tool 1 in a direction approaching the object to be fastened, with the contact member 81 abutting against the object to be fastened. This eliminates the need to move the tool body in a direction approaching the object to be fastened, as is the case with ordinary drill drivers and impact drivers, improving workability.

[0069] Furthermore, the second drive unit 5 presses the screw engaged with the driver bit 2 against the object to be fastened using the driving force of the bit moving motor 50, so that it is easy to adjust the force pressing the screw against the object to be fastened, and the screw can be pressed against the object to be fastened with the appropriate force.

[0070] Furthermore, the first drive unit 4 is provided at the rear, that is, on one side of the tool body 10, with the handle 11 in between, and the second drive unit 5 is provided at the front, that is, on the other side of the tool body 10, with the handle 11 in between. As a result, the first drive unit 4 and the second drive unit 5, each having a motor and being relatively heavy, are distributed in front of and behind the handle 11. Therefore, when fastening work is performed with the handle 11 held in the hand and the extension direction of the tool body 10 in a substantially horizontal orientation, the weight balance in front of and behind the handle 11 becomes substantially equal, improving workability.

[0071] Furthermore, the second drive unit 5 is disposed offset to the left, which is one side of the approximate center in the left-right direction of the fastening tool 1, and the screw feed unit 7 is disposed such that the screw feed motor 70 is offset to the right, which is the other side of the approximate center in the left-right direction of the fastening tool 1. This results in an approximately equal weight balance between the left and right, improving workability.

[0072] As described above, in the fastening tool 1, the first drive unit 4 that rotates the driver bit 2 and the second drive unit 5 that moves the driver bit 2 back and forth along the axial direction are driven by independent motors. This simplifies the configuration compared to a configuration in which two operations are performed by a single drive source, eliminating the need for a drive force transmission mechanism or a mechanism for transmitting the drive force at a predetermined timing. Furthermore, the simplified configuration allows for weight reduction. Furthermore, the two operations can be linked by control.

[0073] Furthermore, by using the screw feed motor 70 as a drive source, the screw feed unit 7 can be driven by electricity supplied from the battery 12, eliminating the need for air pressure. Furthermore, by driving the screw feed unit 7 by a motor independent of the rotation and movement of the driver bit 2, the configuration can be simplified compared to a configuration in which two or three operations are performed by a single drive source. Furthermore, it is possible to control the linkage of multiple operations.

[0074] The screw feed unit 7 is configured so that each component, assembled as a unit, can be detachably attached to the nose body 10f that constitutes the tool body 10. This improves assembly ease and facilitates replacement during maintenance and inspection, as opposed to a configuration in which each component, such as the screw feed motor 70, is independently fixed to the tool body 10. Furthermore, compared to a configuration in which each component is independently fixed to the tool body 10, the precision between the components can be improved. Furthermore, the nose body 10f to which the screw feed unit 7 is fixed is integral with or fixed to the front frame 10b that constitutes the tool body 10, thereby improving the precision of the attachment position of the screw feed unit 7 relative to the tool body 10. Furthermore, the nose body 10f constitutes a part of the injection passage 80 through which the driver bit 2 passes, thereby improving the precision of the attachment position of the screw feed unit 7 relative to the injection passage 80.

[0075] 9A and 9B are perspective views showing an example of the operation of attaching and detaching the driver bit in the fastening tool of this embodiment. Next, the operation of attaching and detaching the driver bit 2 will be described with reference to these drawings.

[0076] 1, in the fastening tool 1, the tip of the driver bit 2 located at the standby position P1 is located deep inside the nose portion 8 and is not exposed to the ejection port 81a of the contact member 81. Therefore, when replacing the driver bit 2, the nose portion 8 is detached.

[0077] To attach or detach the nose portion 8, first remove the screw 87. By removing the screw 87, the nose portion 8 can be removed from the fastening tool 1 as shown in FIG. 9B. The nose portion 8 is configured to be detachable from the tool body 10 in a state where the various components are assembled, and the contact member 81 that covers the front end of the tool body 10 and the injection port 8 can be removed. 1a When the nose portion 8 is removed from the front frame 10b that constitutes the tool body 10, the injection passage component 80a, which is a component on the nose portion 8 side, comes off from the injection passage component 80b of the nose main body portion 10f that is fixed to the tool body 10, and the injection passage 80 is exposed.

[0078] As a result, the front end of the rotation guide member 31 is exposed at the front end of the tool body 10, and the driver bit 2 is exposed from the opening at the front end of the rotation guide member 31. Therefore, the driver bit 2 can be removed from the holding member 30 by grasping the driver bit with a tool such as pliers and pulling it.

[0079] The driver bit 2 is attached by inserting the driver bit 2 through the opening in the rotation guide member 31 and pushing it into the opening 30a of the holding member 30, whereby the driver bit 2 is held by the holding member 30. Then, the nose portion 8 is attached to the front end of the tool body 10, and the screw 87 is fastened, whereby the nose portion 8 is fixed to the tool body 10.

[0080] In addition, if the pulley 52 does not rotate even if an external force is applied to the pulley 52 when the bit moving motor 50 is stopped due to the relationship of the reduction ratio of the reducer 51 of the second driving unit 5, the moving member 3 can be moved to the replacement position where the tip of the driver bit 2 protrudes a predetermined amount from the rotation guide member 31. 2 A bit exchange mode may be provided in which the rotation of the bit moving motor 50 is stopped while the bit is being moved.

[0081] The nose portion 8 is configured so that the components constituting the injection passage 80, the contact member 81, and the contact arm 82 can be attached to and detached from the tool body 10 in an assembled unit state. This improves assembly ease compared to a configuration in which each component, such as the contact arm 82, is independently fixed to the tool body 10. Also, compared to a configuration in which each component is independently fixed to the tool body 10, it is possible to improve the accuracy between each component. Furthermore, the contact switch unit 84, which requires wiring, is attached to the tool body 10, eliminating the need to connect or disconnect wiring.

[0082] <Modifications of the fastening tool of this embodiment> FIG. 10A is a side cross-sectional view showing a modified example of the fastening tool of the present embodiment, FIG. 10B is a side cross-sectional view showing another modified example of the fastening tool of the present embodiment, and FIG. 11 is a block diagram showing a modified example of the fastening tool of the present embodiment.

[0083] As described above, the fastening tool 1 includes the second drive unit 5 that moves the driver bit 2 back and forth along the axial direction, and the second drive unit 5 is driven by the bit moving motor 50. The moving member 32, which is connected by a wire 54 to the pulley 52 driven and rotated by the bit moving motor 50, and the holding member 30, which is connected to the moving member 32, move forward along the axial direction of the driver bit 2 along the rotation guide member 31. This allows the movement amount (advancement amount) of the driver bit 2 to be controlled by controlling the rotation amount of the bit moving motor 50. That is, by rotating the bit moving motor 50 in conjunction with the rotation of the bit rotation motor 40, which rotates the driver bit 2 in the direction to fasten the screw 200, the advancement amount of the driver bit 2, which advances following the screw 200 as the screw 200 is fastened, can be controlled by the rotation amount of the bit moving motor 50, and the stop position of the driver bit 2 along the axial direction can be controlled.

[0084] Figures 12A to 12C are cross-sectional views showing the fastening state of a screw, with Figure 12A showing a so-called flush state in which the head 201 of the screw 200 is neither floating above nor embedded in the surface of the object 202 to be fastened, Figure 12B showing a state in which the head 201 of the screw 200 is floating above the object 202 to be fastened, and Figure 12C showing a state in which the head 201 of the screw 200 is embedded in the object 202 to be fastened.

[0085] In the fastening tool 1, when the tip of the driver bit 2 reaches the operation end position P2, if the screw 200 is a flat head screw, it is preferable that the advancement amount of the driver bit 2 is set so that the surface of the head 201 of the screw 200 is flush with the surface of the object 202 to be fastened, as shown in Fig. 12A. Note that the screw 200 is not limited to a flat head screw, and if it is a pan head screw, bind screw, truss screw, or the like, the bearing surface of the head 201 of the screw 200 comes into contact with the surface of the object 202 to be fastened, and the head 201 of the screw 200 comes into contact with the surface of the object 202 to be fastened. 2 It is preferable that the advancement amount of the driver bit 2 is set so that the driver bit 2 does not float.

[0086] When the tip of the driver bit 2 reaches the operation end position P2, if the head 201 of the screw 200 is floating above the object 202 to be fastened as shown in Fig. 12B, the amount of advancement of the driver bit 2 can be increased to move the operation end position P2 forward. On the other hand, if the head 201 of the screw 200 is embedded in the object 202 to be fastened as shown in Fig. 12C, the amount of advancement of the driver bit 2 can be decreased to move the operation end position P2 backward.

[0087] Therefore, a setting unit 110 is provided that sets the advance amount of the driver bit 2. The setting unit 110 is an example of a setting means, and is configured to allow a plurality of setting values ​​to be selected, or an arbitrary setting value to be continuously selected. The setting unit 110 is configured such that the setting value is selected with a rotary dial, for example, as shown in FIG. 10A.

[0088] Among the methods of providing a dedicated setting means for setting the movement amount (advance amount) of the driver bit 2, in the configuration with the rotary dial described above, possible methods for converting the operator's operation into an electrical signal include a potentiometer whose resistance value changes depending on the rotation angle of the shaft to which the dial is connected, or a rotary encoder that outputs pulses according to the rotation angle. The control unit 100 reads these voltage values ​​and pulse numbers, and sets the number of rotations (amount of rotation) of the bit movement motor 50, which determines the movement amount (advance amount) of the driver bit 2.

[0089] When both the contact switch unit 84, which is activated when pressed by the contact arm 82, and the trigger switch unit 90, which is activated by operating the trigger 9, are turned on and the conditions for starting screw tightening are met, the bit moving motor 50 is rotated a set amount of rotation starting from the standby position P1, which is the initial position of the driver bit 2, and then the rotation is stopped or reversed, thereby controlling the operation end position P2 and adjusting the tightening depth.

[0090] 10B, the setting unit 110 may be configured so that a setting value is selected with a button. In a method using a switch that is activated by pressing a button or the like, a method can be considered in which, for example, a plurality of tactile switches (momentary switches), two in this example, are used, and the number of rotations (amount of rotation) of the bit moving motor 50 is set according to the switch that is pressed. In this method, once the power to the tool body is cut off, the previous setting value will be unknown the next time the power is turned on, so it is also possible to store the setting value using a memory element such as an EEPROM.

[0091] The setting unit 110 may be a lever switch or a touch panel. The setting unit 110 may also be a combination of multiple setting means, for example, a combination of the dial system and the switch system described above. In this case, the tightening amount may be adjusted by operating the dial, and the tightening amount may be set deeper by operating the switch when it is necessary to temporarily tighten the screw at an angle, such as when tightening the screw at a corner.

[0092] Furthermore, the setting unit 110 may be configured to display the selected setting value by using a label or marking, an LED, or the like, so that the operator can easily grasp the current setting value. Note that, to prevent erroneous determination of the setting due to noise or the like, the setting signal may be detected only when the bit moving motor 50 is stopped. Also, since it is conceivable that the potentiometer may malfunction and display an abnormal voltage outside the normal operating range, it is conceivable to not use an abnormal value, or to notify the operator of the malfunction using an LED, buzzer, or the like.

[0093] In a configuration in which the advancement amount of the driver bit 2 is adjusted mechanically, such as by moving the position of a stopper, a setting unit that moves the position of the stopper is provided near the nose portion 8. In contrast, in the fastening tool 1 of this embodiment, the movement amount (advancement amount) of the driver bit 2 can be electrically controlled by controlling the rotation amount of the bit movement motor 50. This reduces restrictions on the location of the setting unit 110. Therefore, in the example of FIGS. 10A and 10B , the setting unit 110 is provided on one side of the battery attachment portion 13 provided at the bottom of the handle 11. Note that when the handle 11 is held with the right hand, the setting unit 110 is operated with the left hand, so it is preferable to provide the setting unit 110 on the left side of the battery attachment portion 13.

[0094] Fig. 13 is a plan view showing an example of the setting section. The setting section 110 shown in Fig. 13 is provided in the fastening tool 1 shown in Fig. 10B, and includes a button 110a for selecting a setting value that gradually decreases the advance amount of the driver bit 2, and a button 110b for selecting a setting value that gradually increases the advance amount of the driver bit 2.

[0095] Furthermore, the setting unit 110 is provided with a guide illustration 110a1 to enable visual recognition of the setting value selected by operating the button 110a. The guide illustration 110a1 may be provided on the button 110a or in the vicinity of the button 110a. Similarly, the setting unit 110 is provided with a guide illustration 110b1 to enable visual recognition of the setting value selected by operating the button 110b. The guide illustration 110b1 may be provided on the button 110b or in the vicinity of the button 110b.

[0096] Furthermore, the setting unit 110 is equipped with lamps 110c that display the selected setting value. The lamps 110c are an example of a display unit, and the selected setting value is displayed by the number of lamps 110c that light up. For example, when decreasing the advance amount of the driver bit 2, the number of lit lamps 110c is reduced, and when increasing the advance amount of the driver bit 2, the number of lit lamps 110c is increased. Furthermore, the color of the lamps 110c may be changed depending on the setting value.

[0097] In order to set the movement amount (advancement amount) of the driver bit 2, a contact switch unit 84 or a trigger switch unit 90 may be used as the setting means, instead of a method of providing a dedicated setting means. In a method using an existing operating means such as the contact switch unit 84 or the trigger switch unit 90 as the setting means, the number of rotations (amount of rotations) of the bit moving motor 50 can be set by performing a predetermined setting operation of the contact arm 82 or the trigger 9 that is different from the operation of performing a normal fastening operation. For example, if the trigger 9 is pulled and released a predetermined number of times within a predetermined time without operating the contact arm 82, this is determined to be a setting operation for setting the number of rotations (amount of rotations) of the bit moving motor 50. Specifically, it is conceivable to adjust the fastening depth in stages each time a predetermined operation, such as quickly operating only the trigger 9 three times, is repeated.

[0098] In a method that uses an existing operating means such as the contact switch unit 84 or the trigger switch unit 90 as the setting means, a separate operating means or setting means for adjusting the tightening amount is not required, which allows the tool body to be made smaller and less expensive.

[0099] FIG. 14 is a flowchart showing an example of the operation of the fastening tool according to a modified example of this embodiment. Next, the operation of setting the advance amount of the driver bit 2 and fastening the tool will be described with reference to the respective drawings.

[0100] 14, the control unit 100 sets the amount of rotation of the bit moving motor 50, which determines the amount of advancement of the driver bit 2, based on the setting value selected by the setting unit 110. When the contact member 81 is pressed against the object to be fastened, the contact switch unit 84 is pressed by the contact arm 82, the contact switch unit 84 is turned on in step SA2, the trigger 9 is operated, and the trigger switch unit 90 is turned on in step SA3, the control unit 100 drives the bit moving motor 50 of the second drive unit 5 in step SA4 and drives the bit rotation motor 40 of the first drive unit 4 in step SA5.

[0101] When the bit moving motor 50 is driven to rotate in one direction, that is, the forward direction, the moving member 32 connected to the pulley 52 by the wire 54 and the holding member 30 connected to the moving member 32 move forward along the axial direction of the driver bit 2 along the rotation guide member 31.

[0102] As a result, the driver bit 2 held by the holding member 30 moves forward, and the injection port 8 of the nose portion 8 1a The screw 200 is engaged with the screw 200 supplied to the screw hole 201, and the screw 200 is moved forward and pressed against the object to be fastened.

[0103] When the bit rotation motor 40 is driven to rotate in the forward direction, the holding member 30 rotates together with the rotation guide member 31 .

[0104] As a result, the driver bit 2 held by the holding member 30 rotates the screw 200 in the forward direction (clockwise) and screws it into the object to be fastened. The control unit 100, in conjunction with the operation of the first drive unit 4 to rotate the driver bit 2 and screw the screw into the object to be fastened, calculates the second rotation speed of the bit rotation motor 40 based on the load applied to the bit rotation motor 40, the rotation speed of the bit rotation motor 40, the load applied to the bit movement motor 50, the rotation speed of the bit movement motor 50, etc. 2 The driver bit 2 is moved forward by the driving unit 5, so that the driver bit 2 follows the screw being screwed into the object to be fastened.

[0105] When the amount of rotation of the bit moving motor 50 reaches the set value selected by the setting unit 110 in step SA6 and the tip of the driver bit 2 reaches the set operation end position P2, the control unit 100 stops driving the bit rotation motor 40 in step SA7 and reverses the rotation of the bit moving motor 50 in step SA8.

[0106] When the bit moving motor 50 rotates in the other direction, i.e., the reverse direction, the wire 54 is pulled out from the pulley 52, causing the biasing member 33 to push the moving member 32 rearward, and the moving member 32 and the holding member 30 connected to the moving member 32 move rearward along the axial direction of the driver bit 2 along the rotation guide member 31.

[0107] When the bit moving motor 50 rotates in the reverse direction to the initial position where a predetermined amount of wire 54 is pulled out from the pulley 52 in step SA9, the control unit 100 stops the reverse rotation of the bit moving motor 50 in step SA10.

[0108] As a result, the driver bit 2 held by the holding member 30 moves rearward, and the tip of the driver bit 2 returns to the standby position P1.

[0109] In the fastening tool 1, the movement amount (advancement amount) of the driver bit 2 can be controlled by controlling the rotation amount of the bit movement motor 50. This allows for highly accurate adjustment of the tip position of the driver bit 2 with a simpler configuration than a configuration in which the advancement amount of the driver bit 2 can be adjusted mechanically, such as by moving the position of a stopper. Therefore, it is possible to prevent the head 201 of the screw 200 from floating above the object 202 to be fastened, as shown in Fig. 12B, or from sinking too far into the object 202 to be fastened, as shown in Fig. 12C, and to achieve a so-called flush state as shown in Fig. 12A, resulting in a clean finish after the fastening operation.

[0110] 15A to 15D are perspective views showing modified examples of the installation position of the setting part. As described above, in the fastening tool 1 of this embodiment, the amount of movement (advancement amount) of the driver bit 2 can be electrically controlled by controlling the amount of rotation of the bit moving motor 50, so there are few restrictions on the location where the setting part 110 can be installed.

[0111] 15A, the setting unit 110 is provided on the upper part of the battery attachment unit 13, which is provided on the lower part of the handle 11. In addition, in FIG. 15B, the setting unit 110 is provided on the rear part of the battery attachment unit 13. By providing the setting unit 110 on the upper or rear part of the battery attachment unit 13 near the center in the left-right direction, the setting unit 110 can be operated regardless of the dominant hand holding the handle 11.

[0112] Furthermore, the setting unit 110 may be provided on the tool body 10 side, and in Fig. 15C, the setting unit 110 is provided on the side of the tool body 10. When the handle 11 is held in the right hand, the setting unit 110 is operated with the left hand, so it is preferable that the setting unit 110 be provided on the left side of the tool body 10.

[0113] 15D, the setting unit 110 is provided at the rear of the tool body 10, in this example, at the rear of the cover part 43 that covers the first drive unit 4. By providing the setting unit 110 near the center in the left-right direction at the rear of the tool body 10, it is possible to operate the setting unit 110 regardless of the dominant hand holding the handle 11. The setting unit 110 may also be provided at the top of the tool body 10.

[0114] In this way, the amount of movement along the axial direction of the driver bit 2 can be set using an electrical signal, so there are fewer restrictions on the placement of the setting section 110, and it is easy to optimize the adjustment of the tightening depth while taking into account the operability. [Explanation of symbols]

[0115] 1 Fastening tool, 10 Tool body, 10a Case, 10b Front frame, 10c Rear frame, 10d Connecting member, 10e Screw, 10f Nose body, 11 Handle, 12 Battery, 13 Battery mounting portion, 2 Driver bit, 3 Bit holding portion, 30 Holding member, 30a Opening, 30b Connecting member, 31 Rotating Guide member, 31a... groove portion, 32... moving member (transmission member), 32a... first moving member, 32b... bearing, 32c... second moving member, 33... biasing member, 4... first driving unit, 40... bit rotating motor (first motor), 40a... shaft, 41... reducer, 41a... shaft, 42... bearing, 5... second driving unit, 50... bit moving motor (motor, second motor), 50a... shaft, 51... reducer, 51a... shaft, 52... pulley (transmission member), 53... bearing, 54... wire (transmission member), 6... screw storage section, 7... screw feed section, 70... screw feed motor, 71... pinion gear (screw feed transmission section), 72... rack gear (screw feed transmission section), 73... engagement section, 74... subframe, 75, 76... screws , 8... nose portion, 80... injection passage, 80a, 80b... injection passage component, 81... contact member, 81a... injection port, 82... contact arm, 83... adjustment portion, 84... contact switch portion, 85... screws, 86... subframe, 87... screws, 88... cover member, 9... trigger, 90... trigger switch portion, 100... control portion, 110... setting portion

Claims

1. a bit holding portion having a holding member that holds the driver bit rotatably and axially movably; a first driving unit having a first motor that only rotates the driver bit held by the holding member in the bit holding unit; a second drive unit having a second motor different from the first motor, and moving the driver bit only along the axial direction by rotation of the second motor, thereby making it possible to control the amount of movement of the driver bit in the axial direction by the amount of rotation of the second motor; a control unit that controls the amount of movement of the driver bit along the axial direction by the amount of rotation of the second motor, The control unit The driver bit is rotated by the first motor in conjunction with an operation of screwing a screw into a fastening object, and the second motor moves the driver bit forward based on the load on the first motor, the rotation amount of the first motor, the load on the second motor, and the rotation amount of the second motor, thereby causing the movement amount of the driver bit along the axial direction to follow the screw being screwed into the fastening object, and the rotation amount of the second motor is controlled to stop the advancing driver bit at a preset stop position. Fastening tools.

2. a setting unit that sets the amount of movement of the driver bit along the axial direction, The control unit controls the rotation amount of the second motor based on a set value of the movement amount along the axial direction of the driver bit set by the setting unit. The fastening tool according to claim 1 .

3. The control unit rotates the second motor, which moves the driver bit along an axial direction, in conjunction with rotation of the first motor, which rotates the driver bit in a direction to fasten a screw, and When the second motor is stopped based on the set value set by the setting unit, the first motor is stopped. The fastening tool according to claim 2 .

4. The setting unit includes a display unit that displays the setting value. The fastening tool according to claim 2 or 3.

Images