Fastening tool

Abstract

To provide a fastening tool that can feed a screw with drive force of a motor.SOLUTION: A fastening tool 1 includes: a screw storage part 6 for storing a screw; and a screw feeding part 7 for feeding a screw stored in the screw storage part 6. The screw feeding part 7 includes: a screw feeding motor 70; a pinion gear 71 fitted to a shaft of the screw feeding motor 70; a rack gear 72 meshing with the pinion gear 71; and an engagement part 73 connected to the rack gear 72 and engaging with a connection screw that is fed from the screw storage part 6.SELECTED DRAWING: Figure 2C

Description

Technical Field

[0001] The present invention relates to a fastening tool that engages a driver bit with a screw, presses the screw with the driver bit against an object to be fastened, and rotates the driver bit to drive it in.

Background Art

[0002] There is known a tool called a portable driving machine 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 uses the combustion pressure of gas, there is a driving machine that mounts a small gas cylinder 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] In addition, a screw driving machine has been proposed that compresses a spring with the driving force of a motor that rotates a screw and drives the screw by the biasing force of the spring (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the screwdriver that utilizes the combustion pressure of the above-described gas, a configuration is adopted in which the screw is urged by an urging member and sent to the nose portion. Also, in a screwdriver that drives a screw by the urging of a spring, a configuration is adopted in which the screw is sent by a combination of electromagnetic force such as a solenoid and an urging means. However, in the case of a configuration in which a plurality of screws are connected by a connecting body and supplied in a rolled form, with the urging force of the urging member or the output of the solenoid, the force for sending the screw is insufficient, or it is difficult to ensure the stroke for sending the screw and send the screw by a predetermined feed amount. Also, in order to be able to send a screw in the above form with a solenoid, a large solenoid is required, and the tool becomes larger in size.

[0007] The present invention has been made to solve such problems, and an object thereof is to provide a fastening tool in which a screw is sent by the driving force of a motor.

Means for Solving the Problems

[0008] To solve the above-described problems, the present invention includes a screw storage portion for storing a screw, and a screw feed portion for sending the screw stored in the screw storage portion to an injection passage through which a driver bit passes. The screw feed portion includes a screw feed motor, an engaging portion that engages with the screw, and a screw feed transmission portion that transmits the driving force of the screw feed motor to the engaging portion. The screw feed portion is a fastening tool in which a unit in which the screw feed motor, the engaging portion, and the screw feed transmission portion are integrally assembled is attached to the tool body. , the screw feed transmission part is supported such that the part connected to the engagement part can reciprocate along the screw feed direction. is a fastening tool.

[0009] In the present invention, in the screw feed portion, an engaging portion having a screw feed motor as a driving source engages with the screw and the screw is sent.

Effects of the Invention

[0010] In the present invention, in the case where the screw feed section uses a screw feed motor as a drive source and a plurality of screws are connected by a connecting body and supplied in a rolled form, even with a motor of a size that can be mounted on a hand-held tool, sufficient force to feed the screw can be obtained, and the screw can be fed by a predetermined feed amount. In addition, an increase in the size of the tool can be suppressed. Further, by controlling the rotation amount of the screw feed motor, the feed amount of the screw can be controlled and adjusted, and compared with a configuration in which the screw is fed by the biasing force of a spring or a solenoid, the control and adjustment of the feed amount of the screw are easy.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2A

Figure 2B

Figure 2C

Figure 3A

Figure 3B

Figure 3C

Figure 4A

Figure 4B

Figure 5

Figure 6A

Figure 6B

Figure 7

Figure 8A

Figure 8B

Figure 9A

Figure 9B

Figure 10A

Figure 10B

Figure 11

Figure 12A

Figure 12B

Figure 12C

Figure 13

Figure 14

Figure 15A

Figure 15B

Figure 15C

Figure 15D

Embodiments for Carrying Out the Invention

[0012] Hereinafter, with reference to the drawings, embodiments of the fastening tool of the present invention will be described.

[0013] <Configuration Example of the 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 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.

[0014] 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.

[0015] 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.

[0016] The fastening tool 1 also includes a screw storage section 6 in which the screw 200 is stored, and a screw storage accommodation 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.

[0017] 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 rotation 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.

[0018] The holding member 30 has an outer diameter slightly smaller than the inner diameter of the rotary guide member 31 and is composed of, for example, a columnar member that can be inserted inside the rotary guide member 31. The holding member 30 is provided with an opening 30a having a shape that matches the cross-sectional shape of the insertion portion 20 of the driver bit 2 at the front end along the axial direction. The holding member 30 includes a mechanism for detachably holding the insertion portion 20 of the driver bit 2 by a known mechanism in the opening 30a. In the holding member 30, the opening 30a is exposed inside the rotary guide member 31, and the insertion portion 20 of the driver bit 2 is detachably inserted into the opening 30a.

[0019] The rotary guide member 31 extends along the extending direction of the tool body 10, has a cylindrical shape into which the holding member 30 can be inserted, and the front end of the rotary guide member 31 is rotatably supported via a bearing 34a on a front metal frame 10b provided on the front side of a resin case 10a that constitutes the exterior of the tool body 10. Also, the rear end of the rotary guide member 31 is connected to the first drive unit 4.

[0020] In the rotary guide member 31, groove portions 31a extending in the front-rear direction along the axial direction of the driver bit 2 are formed at two locations on the side portions facing each other in the radial direction. The rotary guide member 31 penetrates the holding member 30 in the radial direction, and by having connecting members 30b protruding from both sides of the holding member 30 enter the groove portions 31a, the rotary guide member 31 is connected to the holding member 30 via the connecting members 30b.

[0021] Thereby, when the rotary guide member 31 rotates, the holding member 30 rotates together with the rotary guide member 31 because the connecting members 30b are pushed by the groove portions 31a of the rotary guide member 31. Also, the holding member 30 is guided by the groove portions 31a of the rotary guide member 31 and moves in the front-rear direction along the axial direction of the driver bit 2.

[0022] The moving member 32 is an example of a transmission member, and together with the holding member 30, it rotates and moves the holding member 30 in the front-rear direction along the rotary guide member 31. It includes a first moving member 32a, a second moving member 32c supported by the first moving member 32a via a bearing 32b and pushing the first moving member 32a with the bearing 32b, and a buffer member 32d attached to the rear side of the second moving member 32c.

[0023] The first moving member 32a is formed of, for example, a cylindrical member whose inner diameter is slightly larger than the outer diameter of the rotary guide member 31 and is inserted outside the rotary guide member 31. The first moving member 32a is connected to the holding member 30 via a connecting member 30b protruding from the groove portion 31a of the rotary guide member 31.

[0024] 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 rotatably supports the first moving member 32a with respect to the second moving member 32c.

[0025] The second moving member 32c is connected to the first moving member 32a via the bearing 32b in a state where movement in the front-rear direction along the axial direction is restricted with respect to the first moving member 32a.

[0026] As a result, the first moving member 32a is pushed by the second moving member 32c via the bearing 32b in the operation where the second moving member 32c moves in the front-rear direction along the axial direction, and moves in the front-rear direction along the axial direction together with the second moving member 32c. Also, the first moving member 32a is rotatable with respect to the second moving member 32c.

[0027] The biasing member 33 is configured as a coil spring in this example, and is provided between the front frame 10b provided on the front side of the case 10a of the tool body 10 outside the rotary guide member 31 and the second moving member 32c of the moving member 32, and abuts against a spring seat arranged 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 push the moving member 32 backward to the moving member 32.

[0028] The first drive unit 4 includes a bit rotation motor 40 driven by electricity supplied from the battery 12 and a speed reducer 41. The bit rotation motor 40 is an example of the first motor. The shaft 40a of the bit rotation motor 40 is connected to the speed reducer 41, and the shaft 41a of the speed reducer 41 is connected to the rotation guide member 31. The first drive unit 4 is configured such that the speed reducer 41 uses planetary gears, and the bit rotation motor 40 is arranged coaxially with the driver bit 2 held by the rotation guide member 31 and the holding member 30.

[0029] The first drive unit 4 has the bit rotation motor 40 and the speed 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 speed reducer 41 is supported by the rear frame 10c via a bearing 42.

[0030] The bit holding part 3 and the first drive unit 4 are integrally assembled and unitized by connecting the front frame 10b and the rear frame 10c with a coupling 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 part 3 and the first drive unit 4 are configured to be detachable from the tool body 10 in a state where each component is assembled, rather than being configured to fix each component independently to the tool body 10, which improves the assemblability.

[0031] Also, in the bit holding part 3, the front end of the rotation guide member 31 is supported by the front frame 10b provided on the front side of the case 10a of the tool body 10 via a bearing 34a, and the rear end of the rotation guide member 31 is supported by the rear frame 10c provided on the rear side of the case 10a via the shaft 41a of the speed reducer 41 and the bearing 42. Therefore, the bit holding part 3 is rotatably supported by the tool body 10 by the rotation guide member 31.

[0032] Thereby, the first drive 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 because the connecting member 30b is pushed into the groove part 31a of the rotation guide member 31.

[0033] The second drive unit 5 includes a bit moving motor 50 driven by electricity supplied from the battery 12 and a speed reducer 51. The bit moving motor 50 is an example of a motor and a second motor. The shaft 50a of the bit moving motor 50 is connected to the speed reducer 51, and the shaft 51a of the speed reducer 51 is connected to a pulley 52 which is an example of a transmission member. The second drive unit 5 is supported by the tool body 10 via a bearing 53 with the pulley 52. The shaft 50a of the bit moving motor 50 in the second drive unit 5 is arranged along the extending direction of the handle 11.

[0034] In the second drive unit 5, a wire 54 which is an example of a transmission member is wound around the pulley 52, and the wire 54 is connected to a second moving member 32c of the moving member 32.

[0035] Thereby, the second drive unit 5 rotates the pulley 52 by the bit moving motor 50 and winds up the wire 54, thereby moving the second moving member 32c forward. When the second moving member 32c moves forward, the first moving member 32a is pushed via the bearing 32b by the bit holding part 3, and the first moving member 32a moves forward along the axial direction together with the second moving member 32c. When the first moving member 32a moves forward, the holding member 30 connected via the connecting member 30b to the first moving member 32a moves forward.

[0036] The second drive unit 5 is arranged offset to one side with respect to the approximate center in the left - right direction of the fastening tool 1 such that the tangential direction of the part of the pulley 52 around which the wire 54 is wound is along the extending direction of the rotary guide member 31. Thereby, 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 the load when winding up the wire 54 by the pulley 52 and an increase in the load when the wire W is pulled out from the pulley 52 are suppressed.

[0037] 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.

[0038] The screw storage section 6 stores a plurality of screws 200 connected by a connecting band, forming connected screws wound in a spiral shape.

[0039] 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. accommodation 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.

[0040] 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.

[0041] FIG. 6A and FIG. 6B are perspective views showing an example of the nose portion of the present embodiment. The nose portion 8 is an example of a first nose portion, and a screw 200 is supplied by a screw feed portion 7, and includes an injection passage forming portion 80a that forms an injection passage 80 through which a driver bit 2 passes, and an injection port 81a that communicates with the injection passage 80, a contact member 81 that 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 movement amount of the contact arm 82. Further, the nose portion 8 includes a cover member 88 that opens and closes a path through which the screw 200 passes from the screw storage portion 6 to the injection passage 80.

[0042] As shown in FIG. 2C, the fastening tool 1 includes a contact switch portion 84 that is pushed by the contact arm 82 to operate. Further, as shown in FIG. 1A, the fastening tool 1 includes a nose main body portion 10f in a tool main body 10, and the nose main body portion 10f includes an injection passage forming portion 80b that forms the injection passage 80 in combination with the injection passage forming portion 80a of the nose portion 8. The nose main body portion 10f is an example of a second nose portion and is formed integrally with, for example, a front frame 10b. Note that the nose main body portion 10f may be configured such that a component independent of the front frame 10b is fixed to the front frame 10b.

[0043] In the nose portion 8, the contact member 81 is supported so as to be movable 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 biased forward by a biasing member (not shown), and the contact member 81 that has been pressed against the object to be fastened and has moved rearward is biased by the biasing member and moves forward.

[0044] The nose portion 8 is configured such that the adjustment unit 83 adjusts the movement amount of the contact arm 82 until the contact member 81 is pressed against the object to be fastened, the contact arm 82 moves rearward, and the contact switch unit 84 is activated. The contact switch unit 84 has its activation state switched by being pressed by the contact arm 82. In this example, when the contact switch unit 84 is not being pressed by the contact arm 82 and is in a non-activated state, it is defined as the contact switch unit 84 being off, and when the contact switch unit 84 is activated by being pressed by the contact arm 82, it is defined as the contact switch unit 84 being on.

[0045] The nose portion 8 is assembled to the buffer frame 86 and unitized by fitting the components constituting the injection passage 80, the contact member 81, and the contact arm 82 with uneven shapes such as claws and fastening with screws 85, etc. ri sa It is 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 constituted by the injection passage component 80b of the nose body portion 10f fixed to the tool body 10 side and the injection passage component 80a that is a component on the nose portion 8 side.

[0046] The sub-frame 86 having the function of fixing the nose portion 8 to the tool body 10 is formed with an injection passage component 80a that constitutes a part of the injection passage 80, and also has the function of positioning the injection passage 80 with respect to the tool body 10. Thereby, when the nose portion 8 is fixed to the front frame 10b, the injection passage component 80a is correctly aligned. Even when the nose portion 8 is configured to be detachable from the tool body 10, it is suppressed that the injection passage 80 is displaced particularly in the radial direction with respect to the movement path of the driver bit 2. Also, the contact switch unit 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 contact arm 82 on the side facing the contact switch unit 84 coincides with the contact switch unit 84.

[0047] The screw feed portion 7 is configured integrally with the front frame 10b, or the front frame 10 bBy being fixed thereto, the sub-frame 74 is fixed to the nose body portion 10f that constitutes the tool body 10 by screws 76.

[0048] The fastening tool 1 includes a trigger 9 that receives an operation and a trigger switch portion 90 that operates by the operation of 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 pointing operation of the hand holding the handle 11. The trigger switch portion 90 is operated by being pushed by the trigger 9.

[0049] The trigger switch portion 90 has its operation state switched by being pushed by the trigger 9. In this example, when the trigger 9 is not operated and the trigger switch portion 90 is not pushed by the trigger 9 and the trigger switch portion 90 is in a non-operating state, it is defined as the off state of the trigger switch portion 90, and when the trigger 9 is operated and the trigger switch portion 90 is pushed by the trigger 9 and the trigger switch portion 90 is in an operating state, it is defined as the on state of the trigger switch portion 90.

[0050] 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 the trigger switch portion 90 that operates by the operation of the trigger 9 and the contact switch portion 84 that operates by being pushed by the contact member 81. In this example, the control unit 100 is installed inside the battery attachment portion 13 provided at the lower part of the handle 11.

[0051] <Operating Example of the Fastening Tool of 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 broken perspective views showing an example of the operation of the fastening tool of the present embodiment. Hereinafter, with reference to each figure, the fastening operation of the fastening tool of the present embodiment will be described.

[0052] In the standby state, as shown in FIG. 1, the tip of the driver bit 2 is located at the standby position P1 behind the injection passage 80, and the screw 200 can be supplied to the injection passage 80.

[0053] When the contact member 81 is pressed against the object to be fastened, the contact switch portion 84 is pushed by the contact arm 82 to turn on the contact switch portion 84, and when the trigger 9 is operated to turn on the trigger switch portion 90, the control unit 100 drives the bit movement motor 50 of the second drive unit 5 and, at a predetermined timing, drives the bit rotation motor 40 of the first drive unit 4.

[0054] When the bit movement motor 50 is driven and rotates in the forward direction which is one 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 is guided by the rotary guide member 31 and moves forward along the axial direction. 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 while compressing the biasing member 33 together with the second moving member 32c.

[0055] When the first moving member 32a moves forward, the holding member 30 connected to the first moving member 32a by the connecting member 30b is guided by the connecting member 30b in the groove portion 31a of the rotary guide member 31 and moves forward along the axial direction of the driver bit 2.

[0056] As a result, the driver bit 2 held by the holding member 30 moves forward and engages with the screw 200 supplied to the ejection port 8 of the nose portion 8 1a to move the screw 200 forward and press it against the object to be fastened.

[0057] When the bit rotation motor 40 is driven and rotates in the forward direction which is one direction, the rotary guide member 31 rotates in the forward direction. When the rotary guide member 31 rotates in the forward direction, the connecting member 30b connected to the holding member 30 is pushed by the groove portion 31a of the rotary guide member 31, so that the holding member 30 rotates together with the rotary guide member 31.

[0058] 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 drive unit 4 to screw the screw into the object to be fastened, 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., the first 2 By moving the driver bit 2 forward by the drive unit 5 of the, the driver bit 2 is made to follow the screw being screwed into the object to be fastened.

[0059] As shown in FIG. 7, when the tip of the driver bit 2 protrudes from the ejection port 81a of the contact member 81 and reaches the predetermined operation end position P2, the control unit 100 stops driving the bit rotation motor 40 and reverses the bit movement 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 movement motor 50, or the operation end position P2 may be variable 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.

[0060] When the bit movement motor 50 rotates in the reverse direction, which is the other 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 biasing member 33 that was compressed extends and pushes the second moving member 32c backward.

[0061] The second moving member 32c is pushed backward by the biasing member 33 and is guided by the rotary guide member 31 to move backward along the axial direction. When the second moving member 32c moves backward, the first moving member 32a is pulled by the second moving member 32c via the bearing 32b and moves backward along the axial direction together with the second moving member 32c.

[0062] When the first moving member 32a moves rearward, the holding member 30 connected to the first moving member 32a by the connecting member 30b is guided by the connecting member 30b in the groove portion 31a of the rotary guide member 31 and moves rearward along the axial direction of the driver bit 2.

[0063] 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 is provided with a buffer member 32d made of rubber or the like on the rear side of the second moving member 32c, so that in the operation of the second moving member 32c moving rearward, the second moving member 32c is prevented from directly hitting the rear frame 10c, and the generation of noise and damage can be suppressed. 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 engaging portion 73. When the engaging 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 engaging portion 73 and supply the next screw 200 to the supply passage 80.

[0064] The fastening tool 1 includes a first drive unit 4 that rotates the driver bit 2 by a bit rotation motor 40 driven by electricity supplied from the battery 12 detachably attached to the battery attachment portion 13 provided on the handle 11, and a second drive unit 5 that moves the driver bit 2 in the front-rear direction along the axial direction by a bit movement motor 50 driven by electricity supplied from the battery 12. Thereby, unlike a fastening tool driven by air pressure, there is no need to connect a hose, and workability is improved.

[0065] Further, the fastening tool 1 includes a second drive unit 5 that moves the driver bit 2 in the front - rear direction along the axial direction. Thus, with the contact member 81 abutted against the object to be fastened, the fastening of the screw can be performed without moving the fastening tool 1 in the direction approaching the object to be fastened. As a result, unlike a normal drill driver or impact driver, there is no need to move the tool body in the direction approaching the object to be fastened, improving workability.

[0066] Furthermore, the second drive unit 5 presses the screw engaged with the driver bit 2 against the object to be fastened with the driving force of the bit movement motor 50. Therefore, it is possible to easily adjust the excess or deficiency of the force pressing the screw against the object to be fastened, and the screw can be pressed against the object to be fastened with an appropriate force.

[0067] Also, the first drive unit 4 is provided behind, which is one side of the tool body 10, sandwiching the handle 11, and the second drive unit 5 is provided in front, which is the other side of the tool body 10, sandwiching the handle 11. As a result, the relatively heavy first drive unit 4 and second drive unit 5, each having a motor, are dispersedly arranged before and after sandwiching the handle 11. Therefore, when holding the handle 11 by hand and performing the fastening operation with the extending direction of the tool body 10 being substantially horizontal, the weight balance before and after sandwiching the handle 11 becomes substantially even, improving workability.

[0068] Furthermore, the second drive unit 5 is offset and arranged on the left side, which is one side with respect to the approximate center in the left - right direction of the fastening tool 1, and the screw feed unit 7 is offset and arranged on the right side, which is the other side with respect to the approximate center in the left - right direction of the fastening tool 1 by the screw feed motor 70. As a result, the left - right weight balance also becomes substantially even, improving workability.

[0069] As described above, the fastening tool 1 has a first drive unit 4 that rotates the driver bit 2 and a second drive unit 5 that moves the driver bit 2 in the front - rear direction along the axial direction, and these are driven by independent motors. As a result, compared with a configuration that performs two operations with a single drive source, a driving force transmission mechanism and a mechanism for transmitting the driving force at a predetermined timing are unnecessary, and the configuration can be simplified. Also, since the configuration can be simplified, weight reduction can be achieved. Furthermore, the interlocking of the two operations can be controlled.

[0070] Also, regarding the screw feed unit 7, by using the screw feed motor 70 as a drive source, it can be driven by electricity supplied from the battery 12, and the supply of pneumatic pressure is unnecessary. Furthermore, since the screw feed unit 7 is driven by a motor independent of the rotation and movement of the driver bit 2, compared with a configuration that performs two or three operations with a single drive source, the configuration can be simplified. Also, the interlocking of multiple operations can be controlled.

[0071] The screw feed unit 7 is configured to be detachable from the nose body portion 10f that constitutes the tool body 10 in a state where each component is unitized and assembled. As a result, instead of a configuration in which each component such as the screw feed motor 70 is independently fixed to the tool body 10, the assemblability is improved, and replacement during maintenance and inspection can be easily performed. Also, compared with a configuration in which each component is independently fixed to the tool body 10, the accuracy between components can be improved. Furthermore, since the nose body portion 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, the accuracy of the mounting position of the screw feed unit 7 with respect to the tool body 10 can be improved. Also, since the nose body portion 10f constitutes a part of the injection passage 80 through which the driver bit 2 passes, the accuracy of the mounting position of the screw feed unit 7 with respect to the injection passage 80 can be improved.

[0072] Figures 9A and 9B are perspective views showing an example of the attachment and detachment operation of the driver bit in the fastening tool of the present embodiment. Next, with reference to each figure, the operation of attaching and detaching the driver bit 2 will be described.

[0073] In the fastening tool 1, as shown in FIG. 1, the tip of the driver bit 2 located at the standby position P1 is located inside the nose portion 8 and does not expose to the ejection port 81a of the contact member 81. Therefore, when replacing the driver bit 2, the nose portion 8 is detached.

[0074] To attach and detach the nose portion 8, first, the screw 87 is removed. By removing the screw 87, as shown in FIG. 9B, the nose portion 8 can be detached from the fastening tool 1. The nose portion 8 is configured to be detachable from the tool body 10 in a state where each component is assembled, and components such as the contact member 81 covering the front end of the tool body 10 and the ejection port 8 1a are integrally removed. When the nose portion 8 is removed from the front frame 10b constituting the tool body 10, the injection passage component 80a on the nose portion 8 side is detached from the injection passage component 80b of the nose main body portion 10f fixed to the tool body 10 side, and the injection passage 80 is exposed.

[0075] As a result, the front end of the rotary 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 rotary guide member 31. Therefore, by gripping the driver bit with a tool such as pliers and pulling it, the driver bit 2 can be removed from the holding member 30.

[0076] To attach the driver bit 2, the driver bit 2 is inserted through the opening of the rotary guide member 31 and pushed into the opening 30a of the holding member 30, so that 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 tightened, so that the nose portion 8 is fixed to the tool body 10.

[0077] In addition, due to the reduction ratio of the speed reducer 51 of the second drive unit 5, if the pulley 52 does not rotate even when an external force is applied to the pulley 52 in a state where the bit moving motor 50 is stopped, the tip of the driver bit 2 is moved to the exchange position where it protrudes from the rotary guide member 31 by a predetermined amount by the moving member 3 2A bit exchange mode may be provided to stop the rotation of the bit movement motor 50 while it is being moved.

[0078] The nose portion 8 is configured to be detachable from the tool body 10 in a state where the components constituting the injection passage 80, the contact member 81, and the contact arm 82 are unitized and assembled. As a result, the components such as the contact arm 82 are not fixed to the tool body 10 independently, which improves the assemblability. Also, the accuracy between the components can be improved compared to a configuration where the components are fixed to the tool body 10 independently. Further, the contact switch portion 84 that requires wiring is attached to the tool body 10 side, eliminating the need for wiring connection and disconnection.

[0079] <Modification Example of the Fastening Tool of the Present Embodiment> FIG. 10A is a side sectional view showing a modification example of the fastening tool of the present embodiment, FIG. 10B is a side sectional view showing another modification example of the fastening tool of the present embodiment, and FIG. 11 is a block diagram showing a modification example of the fastening tool of the present embodiment.

[0080] As described above, the fastening tool 1 includes a second drive unit 5 that moves the driver bit 2 in the front-rear direction along the axial direction. The second drive unit 5 is driven by a bit movement motor 50, and a pulley 52 that is driven by the bit movement motor 50 and rotates, a moving member 32 connected by a wire 54, and a holding member 30 connected to the moving member 32 move forward in the front direction along the axial direction of the driver bit 2 along a rotation guide member 31. As a result, by controlling the rotation amount of the bit movement motor 50, the movement amount (forward movement amount) of the driver bit 2 can be controlled. That is, in conjunction with the rotation of the bit rotation motor 40 that rotates the driver bit 2 in the direction of fastening the screw 200, by rotating the bit movement motor 50, as the screw 200 is fastened, the forward movement amount of the driver bit 2 that advances following the screw 200 can be controlled by the rotation amount of the bit movement motor 50, and the stop position along the axial direction of the driver bit 2 can be controlled.

[0081] Figs. 12A to 12C are cross-sectional views showing the fastening state of the screw. Fig. 12A shows a so-called flush state where the head 201 of the screw 200 neither lifts nor sinks from the surface of the object to be fastened 202. Fig. 12B shows a state where the head 201 of the screw 200 floats from the object to be fastened 202. Fig. 12C shows a state where the head 201 of the screw 200 is buried in the object to be fastened 202.

[0082] When the tip of the driver bit 2 reaches the operation end position P2, when the screw 200 is a countersunk head screw, as shown in Fig. 12A, it is preferable that the forward movement amount of the driver bit 2 is set so that the surface of the head 201 of the screw 200 becomes flush with the surface of the object to be fastened 202, that is, in a so-called flush state. Note that the screw 200 is not limited to a countersunk head screw. If it is a pan head screw, a binding screw, a truss screw, etc., it is preferable that the forward movement amount of the driver bit 2 is set so that the seating surface of the head 201 of the screw 200 contacts the surface of the object to be fastened 202 and the head 201 of the screw 200 does not float from the object to be fastened 20 2 and does not enter a floating state.

[0083] When the tip of the driver bit 2 reaches the operation end position P2 and the head 201 of the screw 200 is in a state of floating from the object to be fastened 202 as shown in Fig. 12B, the forward movement amount of the driver bit 2 may be increased to move the operation end position P2 forward. On the other hand, when the head 201 of the screw 200 is in a state of being buried in the object to be fastened 202 as shown in Fig. 12C, the forward movement amount of the driver bit 2 may be decreased to move the operation end position P2 backward.

[0084] Therefore, a setting unit 110 for setting the forward movement amount of the driver bit 2 is provided. The setting unit 110 is an example of a setting means, and a plurality of setting values can be selected, or an arbitrary setting value can be selected steplessly. The setting unit 110 is configured such that, for example, as shown in Fig. 10A, a rotational dial is used to select the setting value.

[0085] In the method of providing a dedicated setting means for setting the moving amount (forward movement amount) of the driver bit 2, in the configuration including the above-described rotary dial, as a means for converting the operator's operation into an electric signal, a potentiometer whose resistance value changes according to the rotation angle of the shaft to which the dial is connected, a rotary encoder that outputs pulses according to the rotation angle, or the like can be considered. The control unit 100 reads these voltage values and pulse counts, and sets the number of rotations (rotation amount) of the bit movement motor 50 that determines the moving amount (forward movement amount) of the driver bit 2.

[0086] When both the contact switch unit 84 that is actuated by being pressed by the contact arm 82 and the trigger switch unit 90 that is actuated by the operation of the trigger 9 are turned on and the condition for starting screw fastening is satisfied, starting from the standby position P1 which is the initial position of the driver bit 2, after rotating the bit movement motor 50 by the set rotation amount, by stopping the rotation or reversing, the operation end position P2 can be controlled to adjust the tightening depth.

[0087] Further, as shown in FIG. 10B, the setting unit 110 may be configured such that a set value is selected by a button. In a method using a switch that is actuated by pressing, such as a button, for example, a plurality of, in this example, two tactile switches (momentary switches) are used, and a method of setting the number of rotations (rotation amount) of the bit movement motor 50 according to the pressed switch can be considered. In the case of this method, when the power of the tool body is cut off once, the previous set value becomes unknown when the power is turned on next time, so it is also conceivable to store the set value using a storage element such as an EEPROM.

[0088] The setting unit 110 may be a lever-type switch or a touch panel. Further, the setting unit 110 may be a combination of a plurality of setting means. For example, the above-described dial method and switch method may be combined. In this case, the tightening amount can be adjusted by dial operation, and the tightening amount can be set deeper by switch operation when it is necessary to perform diagonal driving such as temporary corner driving.

[0089] Furthermore, the setting unit 110 may be configured to display the selected set value by a method of indicating the current value with a label, engraving, etc., or a method of indicating the current value with an LED or the like so that the operator can easily grasp the current set value. In addition, in order to prevent misjudgment of the setting due to noise or the like, the setting signal may be detected only when the bit movement motor 50 stops. Also, since it is conceivable that the potentiometer may indicate an abnormal voltage outside the normal operation range due to a failure, it is also conceivable not to adopt abnormal values or to notify the operator of the failure by an LED, buzzer, or the like.

[0090] In a configuration in which the forward movement amount of the driver bit 2 is adjusted by a mechanical configuration such as moving the position of the stopper, there is a case where a setting unit for moving the position of the stopper is provided in the vicinity of the nose portion 8. On the other hand, in the fastening tool 1 of the present embodiment, the movement amount (forward movement amount) of the driver bit 2 can be electrically controlled by controlling the rotation amount of the bit movement motor 50. Therefore, there are few restrictions on the position where the setting unit 110 is provided. Thus, in the examples of FIGS. 10A and 10B, the setting unit 110 is provided on one side portion of the battery attachment portion 13 provided at the lower part of the handle 11. When the handle 11 is held with the right hand, since the setting unit 110 is to be operated with the left hand, it is preferable that the setting unit 110 is provided on the left side portion of the battery attachment portion 13.

[0091] FIG. 13 is a plan view showing an example of the setting unit. The setting unit 110 shown in FIG. 13 is provided in the fastening tool 1 shown in FIG. 10B, and includes a button 110a for selecting a set value for gradually decreasing the forward movement amount of the driver bit 2 and a button 110b for selecting a set value for gradually increasing the forward movement amount of the driver bit 2.

[0092] In addition, the setting unit 110 includes a guide diagram 110a1 in order to make the set value selected by operating the button 110a visually recognizable. The guide diagram 110a1 may be provided on the button 110a or in the vicinity of the button 110a. Similarly, the setting unit 110 includes a guide diagram 110b1 in order to make the set value selected by operating the button 110b visually recognizable. The guide diagram 110b1 may be provided on the button 110b or in the vicinity of the button 110b.

[0093] Furthermore, the setting unit 110 includes a lamp 110c that displays the selected set value. The lamp 110c is an example of a display unit, and the selected set value is displayed by the number of lit lamps among the plurality of lamps 110c. For example, when decreasing the forward movement amount of the driver bit 2, the number of lit lamps 110c is decreased, and when increasing the forward movement amount of the driver bit 2, the number of lit lamps 110c is increased. Also, the color of the lamp 110c may be changed according to the set value.

[0094] In addition to the method of providing dedicated setting means for setting the movement amount (forward movement amount) of the driver bit 2, as setting means, a contact switch unit 84 or a trigger switch unit 90 may be used. In a method using existing operating means such as the contact switch unit 84 or the trigger switch unit 90 as setting means, the contact arm 82 or the trigger 9 is operated to perform a predetermined setting operation different from the operation for performing a normal fastening operation, so that the number of rotations (rotation amount) of the bit movement motor 50 can be set. For example, when a continuous operation of pulling and releasing the trigger 9 a predetermined number of times within a predetermined time without operating the contact arm 82 is performed, it is determined that this is a setting operation for setting the number of rotations (rotation amount) of the bit movement motor 50. Specifically, each time a predetermined operation such as quickly operating only the trigger 9 three times is repeated, it is conceivable to adjust the tightening depth step by step.

[0095] In a method using existing operating means such as the contact switch unit 84 or the trigger switch unit 90 as setting means, since another operating means or setting means for adjusting the tightening amount is not required, the tool body can be miniaturized and the cost can be reduced.

[0096] FIG. 14 is a flowchart showing an operation example of the fastening tool according to a modification of the present embodiment. Next, with reference to each drawing, the operation of setting the forward movement amount of the driver bit 2 and fastening will be described.

[0097] In step SA1 of FIG. 14, the control unit 100 sets the rotation amount of the bit movement motor 50 that defines the forward movement amount of the driver bit 2 based on the set 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 movement 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.

[0098] When the bit movement motor 50 is driven and rotates in the forward direction, which is one direction, the moving member 32 connected by the pulley 52 and 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 rotary guide member 31.

[0099] As a result, the driver bit 2 held by the holding member 30 moves forward, and engages with the screw 200 supplied to the ejection port 8 of the nose portion 8 1a to move the screw 200 forward and press it against the object to be fastened.

[0100] When the bit rotation motor 40 is driven and rotates in the forward direction, which is one direction, the holding member 30 rotates together with the rotary guide member 31.

[0101] 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 drive unit 4 to screw the screw into the object to be fastened, based on the load applied to the bit rotation motor 40, the rotational speed of the bit rotation motor 40, the load applied to the bit movement motor 50, the rotational speed of the bit movement motor 50, etc., the 2 second drive unit 5 moves the driver bit 2 forward, causing the driver bit 2 to follow the screw being screwed into the object to be fastened.

[0102] When the rotation amount of the bit movement motor 50 reaches the set value selected by the setting unit 110 and the tip of the driver bit 2 reaches the set operation end position P2 in step SA6, the control unit 100 stops driving the bit rotation motor 40 in step SA7 and reverses the bit movement motor 50 in step SA8.

[0103] When the bit movement motor 50 rotates in the reverse direction, which is the other direction, the wire 54 is pulled out from the pulley 52, and the biasing member 33 pushes the moving member 32 backward. The moving member 32 and the holding member 30 connected to the moving member 32 move backward along the axial direction of the driver bit 2 along the rotation guide member 31.

[0104] When the bit movement motor 50 reverses to the initial position until 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 movement motor 50 in step SA10.

[0105] As a result, the driver bit 2 held by the holding member 30 moves backward, and the tip of the driver bit 2 returns to the standby position P1.

[0106] In the fastening tool 1, the amount of movement (forward movement amount) of the driver bit 2 can be controlled by controlling the amount of rotation of the bit movement motor 50. As a result, compared with a configuration in which the forward movement amount of the driver bit 2 is adjusted by a mechanical configuration such as moving the position of the stopper, the forward movement amount of the driver bit 2 can be adjusted with high precision with a simple configuration. Therefore, as shown in FIG. 12B, it is possible to prevent the head 201 of the screw 200 from floating from the object to be fastened 202, and as shown in FIG. 12C, it is possible to prevent the object to be fastened 202 from sinking too much, and as shown in FIG. 12A, a so-called flush state can be achieved, and the finish after the fastening operation can be made beautiful.

[0107] FIGS. 15A to 15D are perspective views showing modified examples of the installation position of the setting unit. As described above, in the fastening tool 1 of the present embodiment, since the amount of movement (forward movement amount) of the driver bit 2 can be electrically controlled by controlling the amount of rotation of the bit movement motor 50, there are few restrictions on the position where the setting unit 110 is provided.

[0108] Therefore, in FIG. 15A, the setting unit 110 is provided on the upper part of the battery attachment part 13 provided at the lower part of the handle 11. Further, in FIG. 15B, the setting unit 110 is provided at the rear part of the battery attachment part 13. By providing the setting unit 110 near the center in the left-right direction at the upper part or the rear part of the battery attachment part 13, the setting unit 110 can be operated regardless of the dominant hand holding the handle 11.

[0109] Furthermore, the setting unit 110 may be provided on the tool body 10 side. In FIG. 15C, the setting unit 110 is provided on the side part of the tool body 10. When the handle 11 is held with the right hand, since the setting unit 110 will be operated with the left hand, it is preferable that the setting unit 110 is provided on the left side part of the tool body 10.

[0110] Also, in FIG. 15D, the setting unit 110 is provided at the rear part of the tool body 10, in this example, at the rear part 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 part of the tool body 10, the setting unit 110 can be operated regardless of the dominant hand that holds the handle 11. Note that the setting unit 110 may be provided on the upper part of the tool body 10.

[0111] In this way, since the setting of the amount of movement along the axial direction of the driver bit 2 can be performed by an electric signal, there are few restrictions on the arrangement of the setting unit 110, and optimization considering the operability of tightening depth adjustment is easy.

Description of Reference Numerals

[0112] 1... Fastening tool, 10... Tool body, 10a... Case, 10b... Front frame, 10c... Rear frame, 10d... Coupling member, 10e... Screw, 10f... Nose body part, 11... Handle, 12... Battery, 13... Battery mounting part, 2... Driver bit, 3... Bit holding part, 30... Holding member, 30a... Opening, 30b... Connecting member, 31... Rotation guide member, 31a... Groove part, 32... Moving member (transmission member), 32a... First moving member, 32b... Bearing, 32c... Second moving member, 33... Biasing member, 4... First drive part, 40... Bit rotation motor (first motor), 40a... Shaft, 41... Reducer, 41a... Shaft, 42... Bearing, 5... Second drive part, 50... Bit movement motor (motor, second motor), 50a... Shaft, 51... Reducer, 51a... Shaft, 52... Pulley (transmission member), 53... Bearing, 54... Wire (transmission member), 6... Screw storage part, 7... Screw feed part, 70... Screw feed motor, 71... Pinion gear (screw feed transmission part), 72... Rack gear (screw feed transmission part), 73... Engagement part, 74... Sub-frame, 75, 76... Screws, 8... Nose part, 80... Injection passage, 80a, 80b... Injection passage components, 81... Contact member, 81a... Injection port, 82... Contact arm, 83... Adjustment part, 84... Contact switch part, 85... Screw, 86... Sub-frame, 87... Screw, 88... Cover member, 9... Trigger, 90... Trigger switch part, 100... Control part, 110... Setting part

Claims

1. a screw storage part for storing screws; a screw feeding part for sending the screws stored in the screw storage part to an injection passage through which a driver bit passes; the screw feeding part includes a screw feeding motor; an engaging part that engages with the screw; a screw feeding transmission part that transmits the driving force of the screw feeding motor to the engaging part; in the screw feeding part, a unit in which the screw feeding motor, the engaging part, and the screw feeding transmission part are integrally assembled is attached to the tool body; in the screw feeding transmission part, a part connected to the engaging part is supported so as to be reciprocally movable along the screw feeding direction; a fastening tool.

2. The fastening tool according to claim 1, further comprising: a bit holding part that rotatably and axially movably holds a driver bit that engages with the screw fed by the screw feeding part; a first driving part having a first motor that rotates the driver bit held by the bit holding part; a second driving part having a second motor that moves the driver bit held by the bit holding part axially along. The fastening tool according to claim 1.

3. The fastening tool according to claim 2, further comprising: a battery mounting part to which a battery for supplying electricity to the screw feeding motor, the first motor, and the second motor is attached. The fastening tool according to claim 2.

Images