Contracting tools

Abstract

To provide a fastening tool configured to enable a screw to be pressed by driving force of a motor against an object to be fastened.SOLUTION: A fastening tool 1 comprises: a bit holding part 3 that has a holding member 30 that holds a driver bit 2 rotatably and movably in a longitudinal direction along an axial direction, and a moving member 32 that moves the holding member 30 in the longitudinal direction; a bit moving motor 50 that moves the driver bit 2 held on the holding member 30 in the bit holding part 3, along the axial direction; a pulley 52 that rotates by driving force of the bit moving motor 50; and a wire 54 which is wound around the pulley 52, and connected to the moving member 32. The driving force of the bit moving motor 50 is transmitted through the wire 54 to the moving member 32, so as to press a screw engaged with the driver bit 2 against an object to be fastened, thereby, making the holding member 30 advance in a direction that the screw advances along with fastening of the screw.SELECTED DRAWING: Figure 1

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] There is known a portable tool called a fastener driver that uses the air pressure of compressed air supplied from an air compressor or the combustion pressure of gas to sequentially drive connecting fasteners loaded in a magazine 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 is equipped with a small gas cylinder in the driving machine body and can be used cordlessly, and a screw driving machine that uses screws 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 bias of the spring (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5590505 [Patent Document 2] Patent No. 6197547 Summary of the Invention [Problem to be solved by the invention]

[0006] Screw drivers that use the combustion pressure of gas require both a battery and a gas cylinder, and screw drivers that use spring pressure to drive screws are difficult to adjust for excessive or insufficient force.

[0007] The present invention has been made to solve the above problems, and has an object to provide a fastening tool that can press a screw against an object to be fastened by using the driving force of a motor. [Means for solving the problem]

[0010] In order to solve the above problems The present invention relates to a bit holder that holds a driver bit rotatably and axially movably, a first drive unit having a first motor that rotates the driver bit held by the bit holder, and a second drive unit having a second motor that moves the driver bit held by the bit holder along the axial direction. The tool has a tool body extending in one direction and a handle extending in another direction intersecting the extension direction of the tool body, the first driving unit is provided on one side of the handle along the extension direction of the tool body, the second driving unit is provided on the other side of the handle along the extension direction of the tool body, and the shaft of the second motor is disposed along the extension direction of the handle. It is a fastening tool.

[0011] In the present invention, the first drive unit that rotates the driver bit and the second drive unit that moves the driver bit in the forward and backward directions along the axial direction are driven by independent motors. Effect of the Invention

[0012] In the present invention, the screw engaged with the driver bit is pressed against the object to be fastened by the driving force of the motor, so that the force pressing the screw against the object to be fastened can be easily adjusted to be excessive or insufficient, and the screw can be pressed against the object to be fastened with the appropriate force.

[0013] In addition, in the present invention, compared to a configuration in which two operations are performed by a single drive source, a mechanism for transmitting the drive force and a mechanism for transmitting the drive force at a predetermined timing are not required, and the configuration can be simplified. Also, by simplifying the configuration, weight can be reduced. Furthermore, the two operations can be linked by control. [Brief description of the drawings]

[0014] [Figure 1] 1 is a side cross-sectional view showing an example of an internal structure of a fastening tool according to an embodiment of the present invention. [Figure 2A] FIG. 2 is a partially cutaway perspective view showing an example of the internal structure of the fastening tool of the present embodiment. [Figure 2B]FIG. 2 is a partially cutaway perspective view showing an example of the internal structure of the fastening tool of the present embodiment. [Figure 2C] FIG. 2 is a partially cutaway perspective view showing an example of the internal structure of the fastening tool of the present embodiment. [Figure 3A] FIG. 2 is a side view showing an example of the fastening tool of the present embodiment. [Figure 3B] FIG. 2 is a front view showing an example of the fastening tool of the present embodiment. [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. [Diagram 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] 5A to 5C are side cross-sectional views showing an example of the operation of the fastening tool of the present embodiment. [Figure 8A] FIG. 4 is a partially cutaway perspective view showing an example of an operation of the fastening tool according to the present embodiment. [Figure 8B] FIG. 4 is a partially cutaway perspective view showing an example of an 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. 11 is a side cross-sectional view showing a modified example of the fastening tool of the present embodiment. [Figure 10B] FIG. 11 is a side cross-sectional view showing another modified example of the fastening tool of the present embodiment. [Figure 11] FIG. 13 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] 13 is a perspective view showing a modified example of the installation position of the setting unit. FIG. [Figure 15B] 13 is a perspective view showing a modified example of the installation position of the setting unit. FIG. [Figure 15C] 13 is a perspective view showing a modified example of the installation position of the setting unit. FIG. [Figure 15D] 13 is a perspective view showing a modified example of the installation position of the setting unit. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0016] <Configuration example of the fastening tool according to the present 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 cut surface in Fig. 1 is line AA in Fig. 3B. Figs. 4A to 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. In the fastening tool 1, the handle 11 extends in a direction intersecting the extension direction of the tool body 10 which extends in one direction. In the fastening tool 1, the extension direction of the tool body 10 is the front-rear direction, and the extension direction of the handle 11 is the up-down direction. In addition, the fastening tool 1 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 Delivery The screw feed section 7 feeds the screws stored in the screw feed section 6, and a nose section 8 that is pressed against an object to be fastened and from which the screw is ejected.

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

[0021] The holding member 30 is configured with, 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 matching 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 by 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 along the extension direction of the tool body 10, has a cylindrical shape inside which the holding member 30 fits, and has a front end rotatably supported via a bearing 34a on a metal front frame 10b provided on the front side of a resin case 10a that constitutes the exterior of the tool body 10. In addition, the rotation guide member 31 has a 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-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 the connecting members 30b protruding from both sides of the holding member 30 enter the grooves 31a, so that the rotation guide member 31 is connected 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, and the holding member 30 rotates together with the rotation guide member 31. In addition, the connecting member 30b of the holding member 30 is guided by the groove portion 31a of the rotation guide member 31, and moves in the front-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 / backward direction 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 is configured, for example, as a cylindrical member whose inner diameter is slightly larger than the outer diameter of the rotation guide member 31 and 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 protruding from a 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, the first moving member 32a is pushed by the second moving member 32c via the bearing 32b as the second moving member 32c moves back and forth along the axial direction, and moves back and forth along the axial direction together with the second moving member 32c. Also, the first moving member 32a is rotatable relative to the second moving member 32c.

[0030] The biasing member 33 is constituted by a coil spring in this example, 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 an end face of the outer ring of the bearing 32b. The biasing member 33 is compressed as the moving member 32 moves forward, and applies a force to the moving member 32 that pushes the moving member 32 backward.

[0031] The first drive unit 4 includes a bit rotation motor 40 driven by electricity supplied from the battery 12, and a reduction gear 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 reduction gear 41, and a shaft 41a of the reduction gear 41 is connected to the rotation guide member 31. In the first drive unit 4, the reduction gear 41 is configured using a planetary gear, and the bit rotation motor 40 is disposed 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 by 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-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 to be detachable from the tool body 10 when each part is assembled, which improves ease of assembly, as opposed to a configuration in which each part is fixed to the tool body 10 independently.

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

[0035] As a result, the first driving unit 4 rotates the rotation guide member 31 by the bit rotation motor 40. When the rotation guide member 31 rotates, the holding member 30 that holds the driver bit 2 rotates together with the rotation guide member 31 as the connecting member 30b is pressed by the groove portion 31a of the rotation 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 reduction gear 51. The bit moving motor 50 is an example of a motor and a second motor, and a shaft 50a of the bit moving motor 50 is connected to the reduction gear 51, and a shaft 51a of the reduction gear 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 by 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 portion 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 by 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, as the second moving member 32c moves forward, the first moving member 32a is pushed via the bearing 32b, and the first moving member 32a moves forward together with the second moving member 32c along the axial direction. As the first moving member 32a moves forward, the holding member 30 connected to the first moving member 32a via the connecting member 30b moves forward.

[0039] The second driving unit 5 is disposed offset to one side with respect to 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. As a result, the wire W between the pulley 52 and the second moving member 32c extends linearly along the moving direction of the moving member 32, and an increase in load when the wire 54 is wound around the pulley 52 and an increase in load when the wire W is pulled out from the pulley 52 are suppressed.

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

[0041] The screw storage section 6 stores a plurality of screws 200 connected by a connecting band, forming connected screws wound in a spiral shape.

[0042] 5 is a perspective view showing the details of the screw feed unit of this embodiment. 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 receiving unit 74 connected to the rack gear 72. Delivery The screw feed motor 70 has an engagement portion 73 that engages with a connecting screw fed from the screw feed motor 6. The screw feed motor 70 has a pinion gear 71 and a rack gear 72 that constitute a screw feed transmission portion that transmits the driving force of the screw feed motor 70 to the engagement portion 73. The engagement portion 73 is biased upward by a compression spring (not shown) via a part in which the rack gear 72 is formed, and is configured so that the engagement 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 integrally by fitting the concave and convex shapes of claws, etc., and fastening the screws 75, etc.

[0044] 6A and 6B are perspective views showing an example of a nose portion of this embodiment. The nose portion 8 is an example of a first nose portion, and includes an injection passage configuration portion 80a that configures an injection passage 80 through which the screw 200 is supplied by the screw feed portion 7 and through which the driver bit 2 passes, an injection port 81a that communicates with the injection passage 80 and contacts an object to be fastened, a contact arm 82 that moves in the front-rear direction in conjunction with the contact member 81, and an adjustment portion 83 that regulates the amount of movement of the contact arm 82. The nose portion 8 also includes a cover member 88 that opens and closes the path through which the screw 200 passes from the screw storage portion 6 to the injection passage 80.

[0045] As shown in Fig. 2C, the fastening tool 1 includes a contact switch portion 84 that is actuated when pressed by a contact arm 82. Also, as shown in Fig. 1A, the fastening tool 1 includes a nose body portion 10f on the tool body 10, and the nose body portion 10f includes an injection passage configuration portion 80b that configures the injection passage 80 in combination with the injection passage configuration portion 80a of the nose portion 8. The nose body portion 10f is an example of a second nose portion, and is configured integrally with the front frame 10b, for example. Note that the nose body portion 10f may be configured such that a part independent of 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. In the nose portion 8, the contact member 81 is urged forward by a urging member (not shown), and the contact member 81, which is pressed against an object to be fastened and moved rearward, is urged forward by the urging member.

[0047] In the nose portion 8, the contact member 81 is pressed against the object to be fastened, the contact arm 82 moves 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 by being pressed by the contact arm 82, and in this example, a 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 a 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. Lisa The nose portion 8 is assembled to a front 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 portion 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 portion 10f that is fixed to the tool body 10 side, and the injection passage forming portion 80a that is a component on the nose portion 8 side.

[0049] The subframe 86, which has the function of fixing the nose portion 8 to the tool body 10, has an injection passage component 80a that constitutes a part of the injection passage 80 formed thereon, and also has the function of positioning the injection passage 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 passage component 80a is correctly positioned, and even if the nose portion 8 is configured to be detachable from the tool body 10, the injection passage 80 is prevented from being displaced, particularly in the radial direction, with respect to the movement path of the driver bit 2. In addition, the contact switch portion 84 is attached to the tool body 10 side, and when the nose portion 8 is fixed to the front frame 10b, the position of the side of the contact arm 82 facing the contact switch portion 84 is aligned with the contact switch portion 84.

[0050] The screw feed unit 7 is integrally formed with the front frame 10b or is b4, the subframe 74 is fixed to the nose body portion 10f that constitutes 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 the operation of the trigger 9. The trigger 9 is provided on the front side of the handle 11, and configured to be operable by the finger of a hand gripping 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 inactivated when pressed by the trigger 9. In this example, a state in which the trigger 9 is not operated and the trigger switch unit 90 is not pressed by the trigger 9 and the trigger switch unit 90 is inactivated is referred to as the off state of the trigger switch unit 90, and a state in which the trigger 9 is operated and pressed by the trigger 9 and the trigger switch unit 90 is activated is referred to as the on state of the trigger switch unit 90.

[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 outputs from 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 provided at the bottom of the handle 11.

[0054] <Operation example of the fastening tool according to the present embodiment> FIG. 7 is a side cross-sectional view showing an example of the operation of the fastening tool of the present embodiment, and FIGS. 8A and 8B are partially cutaway perspective views showing an example of the operation of the fastening tool of the present embodiment. Below, the fastening operation of the fastening tool of the present 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 on, and the trigger 9 is operated to turn on the trigger switch unit 90, the control unit 100 drives the bit moving 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, that is, the forward direction, the pulley 52 rotates in the forward direction, and the wire 54 is wound around the pulley 52. ​​When the wire 54 is wound around the pulley 52, the second moving member 32c connected to the wire 54 moves forward along 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 along 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 retaining 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 fastener 210, 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 into the groove portion 31a of the rotation guide member 31, so that the holding member 30 rotates 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 rotating the driver bit 2 by the first driving unit 4 to screw the screw into the object to be fastened, calculates a second rotation speed of the bit rotating motor 40 based on the load applied to the bit rotating motor 40, the rotation speed of the bit rotating motor 40, the load applied to the bit moving motor 50, the rotation speed of the bit moving 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 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, and the wire 54 is pulled out from the pulley 52. ​​When the wire 54 is pulled out from the pulley 52, the second moving member 32c moves forward, and the compressed biasing member 33 expands, pushing the second moving member 32c backward.

[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 retaining 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 cushioning member 32d made of rubber or the like on the rear side of the second moving member 32c, which prevents the second moving member 32c from directly hitting the rear frame 10c when the second moving member 32c moves rearward, thereby suppressing noise generation 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 unit 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 engagement portion 73 descends to a position where it engages with the next screw 200, the control unit 100 reverses the screw feed motor 70 to raise the engagement portion 73 and drive the next screw 200. injection Supply to passage 80.

[0067] The fastening tool 1 has a battery 12 detachably attached to a battery attachment section 13 provided on a handle 11, and includes a first drive section 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 section 5 that moves the driver bit 2 in the forward and backward directions 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 fastening tools driven by air pressure, improving workability.

[0068] Furthermore, the fastening tool 1 includes the second drive unit 5 that moves the driver bit 2 in the forward and backward directions along the axial direction, so that the fastening tool 1 can fasten the screw without moving the fastening tool 1 in a direction approaching the object to be fastened while the contact member 81 is abutted 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 with a normal drill driver or impact driver, 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 possible to easily adjust the force pressing the screw against the object to be fastened, and to press the screw against the object to be fastened with an appropriate amount of force.

[0070] Moreover, the first driving unit 4 is provided at the rear, which is one side of the tool body 10, with the handle 11 in between, and the second driving unit 5 is provided at the front, which is the other side of the tool body 10, with the handle 11 in between. As a result, the first driving unit 4 and the second driving unit 5, each of which has a motor and is relatively heavy, are distributed and disposed in front of and behind the handle 11. Therefore, when the handle 11 is held by hand and fastening work is performed with the extension direction of the tool body 10 in a substantially horizontal orientation, the weight balance in the front and rear of the handle 11 is substantially even, improving workability.

[0071] Furthermore, the second drive unit 5 is disposed offset to the left side, which is one side, with respect to approximately the center in the left-right direction of the fastening tool 1, and the screw feed unit 7 is disposed with the screw feed motor 70 offset to the right side, which is the other side, with respect to approximately the center in the left-right direction of the fastening tool 1. This makes the left-right weight balance approximately equal, 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 in the forward and backward directions 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] Also, by using the screw feed motor 70 as the drive source for the screw feed unit 7, it can be driven by electricity supplied from the battery 12, and does not require the supply of 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. In addition, the interlocking of multiple operations can be controlled.

[0074] The screw feed section 7 is configured to be detachable from the nose body 10f constituting the tool body 10 in a state where each part is unitized and assembled. This improves assembly and facilitates replacement during maintenance and inspection, as opposed to a configuration in which each part, such as the screw feed motor 70, is fixed independently to the tool body 10. In addition, the precision between each part can be improved compared to a configuration in which each part is fixed independently to the tool body 10. Furthermore, the nose body 10f to which the screw feed section 7 is fixed is integral with or fixed to the front frame 10b constituting the tool body 10, so that the precision of the mounting position of the screw feed section 7 relative to the tool body 10 can be improved. In addition, the nose body 10f constitutes a part of the injection passage 80 through which the driver bit 2 passes, so that the precision of the mounting position of the screw feed section 7 relative to the injection passage 80 can be improved.

[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 injection 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 each component is assembled. 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 forming portion 80a, which is a component on the nose portion side 8, comes off from the injection passage forming portion 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 of 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. 2A 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 each component 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 a unitized and assembled state. This improves the ease of assembly, as opposed to a configuration in which each component, such as the contact arm 82, is fixed independently to the tool body 10. Also, compared to a configuration in which each component is fixed independently to the tool body 10, the precision between the components can be improved. Furthermore, the contact switch portion 84, which requires wiring, is attached to the tool body 10, eliminating the need to connect or disconnect the wiring.

[0082] <Modifications of the fastening tool according to the present 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 the modified example of the fastening tool of the present embodiment.

[0083] As described above, the fastening tool 1 includes the second driving unit 5 that moves the driver bit 2 in the forward and backward directions along the axial direction, and the second driving unit 5 is driven by the bit moving motor 50, and the moving member 32 connected by the wire 54 to the pulley 52 driven and rotated by the bit moving motor 50 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. 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 that rotates the driver bit 2 in the direction to fasten the screw 200, the advancement amount of the driver bit 2 that 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 head 201 of screw 200 is neither floating above nor embedded in the surface of object 202 to be fastened, Figure 12B showing a state in which head 201 of screw 200 is floating above object 202 to be fastened, and Figure 12C showing a state in which head 201 of screw 200 is embedded in 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 in a so-called flush state, that is, the same as 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, 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 above the workpiece.

[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 advancement amount of the driver bit 2 is 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 advancement amount of the driver bit 2 is decreased to move the operation end position P2 backward.

[0087] Therefore, a setting unit 110 is provided for setting 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 selection of multiple set values ​​or to allow an arbitrary set value to be selected steplessly. The setting unit 110 is configured such that the set value is selected by a rotary dial, for example, as shown in Fig. 10A.

[0088] Among the methods of providing a dedicated setting means for setting the amount of movement (advancement) of the driver bit 2, in the configuration with the above-mentioned rotary dial, a potentiometer whose resistance value changes according to the rotation angle of the shaft to which the dial is connected, or a rotary encoder that outputs pulses according to the rotation angle, etc., can be used as a means for converting the operator's operation into an electrical signal. The control unit 100 reads these voltage values ​​and pulse numbers, and sets the number of rotations (amount of rotation) of the bit moving motor 50, which determines the amount of movement (advancement) 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 such that the setting value is selected by a button. In a method using a switch that is activated by pressing, such as a button, a method may be considered in which, for example, a plurality of tactile switches (momentary switches), two in this example, are used to set the number of rotations (amount of rotation) of the bit moving motor 50 according to the switch that is pressed. In this method, once the power supply to the tool body is cut off, the previous setting value becomes unknown the next time the power is turned on, so it may be considered to store the setting value using a memory element such as an EEPROM.

[0091] The setting unit 110 may be a lever-type switch or a touch panel. The setting unit 110 may also be a combination of a plurality of setting means, for example, a combination of the dial type and the switch type 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 a corner.

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

[0093] In a configuration in which the advancement amount of the driver bit 2 is adjusted by a mechanical configuration, such as by moving the position of a stopper, a setting unit for moving the position of the stopper is provided near the nose portion 8. In contrast, in the fastening tool 1 of the present embodiment, the movement amount (advancement amount) of the driver bit 2 can be electrically controlled by controlling the rotation amount of the bit moving motor 50. Therefore, there are few restrictions on the position where the setting unit 110 is provided. Therefore, in the example of Figs. 10A and 10B, the setting unit 110 is provided on one side of the battery mounting portion 13 provided on the lower part 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 that the setting unit 110 is preferably provided on the left side of the battery mounting portion 13.

[0094] Fig. 13 is a plan view showing an example of a 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 so that the setting value selected by operating the button 110a can be visually recognized. 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 so that the setting value selected by operating the button 110b can be visually recognized. 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 includes 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 the lamps 110c that are lit. For example, when decreasing the advance amount of the driver bit 2, the number of the lit lamps 110c is reduced, and when increasing the advance amount of the driver bit 2, the number of the lit lamps 110c is increased. Also, the color of the lamps 110c may be changed according to the setting value.

[0097] In order to set the movement amount (advance amount) of the driver bit 2, a contact switch unit 84 or a trigger switch unit 90 may be used as the setting means, other than 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 contact arm 82 is not operated and the trigger 9 is pulled and released a predetermined number of times within a predetermined time, it is determined that this is 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 stepwise 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 amount of tightening is not required, so that the tool body can be made smaller and the cost can be reduced.

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

[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 a 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 rotating 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 fastener 210, and the screw 200 is moved forward and pressed against the object to be fastened.

[0103] Furthermore, when the bit rotating motor 40 is driven to rotate in one direction, that is, 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 rotating the driver bit 2 by the first driving unit 4 to screw the screw into the object to be fastened, calculates a second rotation speed of the bit rotating motor 40 based on the load applied to the bit rotating motor 40, the rotation speed of the bit rotating motor 40, the load applied to the bit moving motor 50, the rotation speed of the bit moving 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, that is, the reverse direction, the wire 54 is pulled out from the pulley 52, causing the moving member 32 to be pushed rearward by the biasing member 33, 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 rotating guide member 31.

[0107] When the bit moving motor 50 rotates in the reverse direction to the initial position where a predetermined amount of the 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 amount of movement (advancement) of the driver bit 2 can be controlled by controlling the amount of rotation of the bit moving motor 50. This allows for highly accurate adjustment of the tip position of the driver bit 2 with a simple configuration, compared to a configuration in which the amount of advancement of the driver bit 2 can be adjusted with a mechanical configuration, such as by moving the position of a stopper. Therefore, the head 201 of the screw 200 is prevented from floating off 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 can be made to have a so-called flat state as shown in Fig. 12A, resulting in a beautiful 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 the present 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 is provided.

[0111] 15A, the setting unit 110 is provided on the upper part of the battery attachment part 13 which is provided on the lower part of the handle 11. Also, in Fig. 15B, the setting unit 110 is provided on the rear part of the battery attachment part 13. By providing the setting unit 110 on the upper part or on the rear part of the battery attachment part 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] 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 that the setting unit 110 is preferably 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 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 portion 110, and it is easy to optimize the adjustment of the tightening depth while taking into account its 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 portion, 40... bit rotating motor (first motor), 40a... shaft, 41... reducer, 41a... shaft, 42... bearing, 5... second driving portion, 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... screw , 8... nose portion, 80... injection passage, 80a, 80b... injection passage forming portion, 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 that holds a driver bit rotatably and axially movably; a first driving unit having a first motor that rotates the driver bit held by the bit holding unit; a second driving unit having a second motor that moves the driver bit held by the bit holding unit along an axial direction; A tool body extending in one direction; a handle extending in another direction intersecting the extension direction of the tool body; The first driving portion is provided on one side of the handle along an extension direction of the tool body, The second driving unit is provided on the other side of the handle in the extension direction of the tool body, and the shaft of the second motor is arranged along the extension direction of the handle. Fastening tools.

2. The first driving unit is arranged coaxially with the driver bit held by the bit holding unit. The fastening tool according to claim 1 .

3. A transmission member that moves the bit holding portion in a direction in which the screw engaged with the driver bit is pressed against an object to be fastened by the driving force of the second motor. The fastening tool according to claim 1 or 2.

4. The second driving unit includes a pulley that is driven to rotate by the second motor, and a wire wound around the pulley, so that the driving force of the second motor is transmitted to the bit holding unit. The fastening tool according to any one of claims 1 to 3.

5. A battery mounting portion to which a battery that supplies electricity to the first motor and the second motor is attached. The fastening tool according to any one of claims 1 to 4.

Images