Fastening tool

Abstract

To provide a fastening tool that is enabled to rotate a driver bit and to move in a fastening direction of a screw, with a simple configuration.SOLUTION: A fastening tool 1 comprises: a rotary guide member 31 which extends in a longitudinal direction and is supported rotatably; a holding member 30 having an opening 30a into which a driver bit 2 is inserted attachably and detachably, the holding member moving in an axial direction of the driver bit 2 along an extending direction of the rotary guide member 31, inside the rotary guide member 31 and rotating together with the rotary guide member 31; and a moving member 32 that moves the holding member 30 in a longitudinal direction along the rotary guide member 31, The moving member 32 comprises: a first moving member 32a, connected to the holding member 30 through a connection member 30b, rotating together with the holding member 30 and the rotary guide member 31 and moving in the axial direction along the rotary guide member 31; and a second moving member 32c that supports the first moving member 32a rotatably and moves in the axial direction along the rotary guide member 31.SELECTED DRAWING: Figure 1A

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 screw 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 the connecting fasteners loaded in a magazine from the tip of a driver guide.

[0003] As a tool that rotates a bit to tighten a screw and moves the bit in the direction of tightening the screw, in a tool that uses air pressure, conventionally, an air-powered screw driver that rotates the bit with an air motor and moves it in the direction of tightening the screw with air pressure has been proposed (see, for example, Patent Document 1).

[0004] Also, a screw driver 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 a screw driving machine that uses pneumatic pressure, a configuration for moving a driver bit in the direction of tightening a screw can utilize a piston, but the configuration for rotating the driver bit becomes a complex mechanism. Also, in a screw driving machine that drives a screw by the biasing force of a spring, the interlocking of the configuration for moving the driver bit in the direction of tightening the screw and the configuration for rotating the driver bit becomes a complex mechanism.

[0007] Also, in a screw driving machine that uses pneumatic pressure, although a driver bit is attached to the piston, it is not a configuration in which the driver bit can be easily replaced. Further, a configuration is conventionally known that includes a ball and a spring that biases the ball, and the driver bit is detachably held by engaging the ball with the driver bit. In such a well-known driver bit detachable holding mechanism, the ball needs to retract during the operation of inserting and removing the driver bit. Therefore, in a configuration where a space for the ball to retract cannot be secured, such a well-known technique cannot be adopted.

[0008] The present invention has been made to solve such problems, and an object thereof is to provide a fastening tool that can realize the rotation of a driver bit and the movement in the direction of tightening a screw with a simple configuration.

Means for Solving the Problems

[0010] To solve the above-described problems, the present invention includes a cylindrical rotation guide member that extends in one direction and is rotatably supported by a bearing, a holding member to which a driver bit is detachably attached and that moves axially along the extending direction of the rotation guide member inside the rotation guide member and rotates together with the rotation guide member, and a moving member that moves the holding member back and forth along the rotation guide member , a first drive unit having a first motor for rotating a rotary guide member, and a second drive unit having a second motor for moving a moving member along an axial direction and is , the first motor has a rotation axis arranged coaxially with the driver bit a fastening tool.

[0011] In the present invention, when a driving force for rotating the rotary guide member is transmitted, the holding member rotates together with the rotary guide member, and the driver bit attached to the holding member rotates in the circumferential direction around the axis. Further, when a driving force for axially moving the moving member is transmitted, while the rotary guide member rotates with respect to the moving member, the holding member moves axially, so that the driver bit moves axially while rotating.

Advantages of the Invention

[0014] In the present invention, a configuration for rotatably supporting the driver bit and axially movably supporting the driver bit in the direction of tightening the screw can be realized with a simple mechanism.

Brief Description of the Drawings

[0016]

Figure 1A

Figure 1B

Figure 1C

Figure 2A

Figure 2B

Figure 3A

Figure 3B

Figure 4A

Figure 4B

Figure 4C

Figure 5

Figure 6A

Figure 6B

Figure 7A

Figure 7B

Figure 8A

Figure 8B

Figure 9

Figure 10A

Figure 10B

Figure 10C

Figure 11

Figure 12A

Figure 12B

Figure 13A

Figure 13B

Figure 13C

Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of the fastening tool of the present invention will be described with reference to the drawings.

[0018] <Configuration Example of the Fastening Tool of the Present Embodiment> FIG. 1A is a side sectional view showing an example of the internal structure of the fastening tool of the present embodiment, FIG. 1B is a top sectional view showing an example of the internal structure of the fastening tool of the present embodiment, and FIG. 1C is a front sectional view showing an example of the internal structure of the fastening tool of the present embodiment. Further, FIG. 2A is an exploded perspective view showing an example of the internal structure of the fastening tool of the present embodiment, and FIG. 2B is an external perspective view showing an example of the fastening tool of the present embodiment.

[0019] The fastening tool 1 of the present embodiment includes a bit holding portion 3 that rotatably and axially movably holds a driver bit 2, 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 axially moves the driver bit 2 held by the bit holding portion 3.

[0020] Further, the fastening tool 1 includes a screw storage portion 6 that stores a screw 200, a screw feed portion 7 that feeds the screw stored in the screw storage portion 6, and a nose portion 8 that is pressed against a fastening object to which the screw 200 is fastened and through which the screw is ejected.

[0021] Furthermore, the fastening tool 1 includes a tool body 10 and a handle 11. Also, the fastening tool 1 includes a battery attachment portion 13 at an end of the handle 11 to which a battery 12 is detachably attached.

[0022] In the fastening tool 1, the tool body 10 extends in one direction along the axial direction of the driver bit 2 indicated by arrows A1 and A2, and the handle 11 extends in another direction intersecting the extending direction of the tool body 10. In the fastening tool 1, the direction in which the tool body 10 extends, that is, the axial direction of the driver bit 2 indicated by arrows A1 and A2, is defined as the front-rear direction. Also, in the fastening tool 1, the direction in which the handle 11 extends is defined as the vertical direction. Furthermore, in the fastening tool 1, the direction orthogonal to the extending direction of the tool body 10 and the extending direction of the handle 11 is defined as the left-right direction.

[0023] The first drive portion 4 is provided behind the tool body 10, on one side of the tool body 10 with the handle 11 interposed therebetween. Also, the second drive portion 5 is provided in front of the tool body 10, on the other side of the tool body 10 with the handle 11 interposed therebetween.

[0024] The screw storage part 6 stores the connecting screws that are formed by connecting a plurality of screws 200 with a connecting band and are wound in a spiral shape.

[0025] Figs. 3A and 3B are perspective views showing an example of the main part configuration of the fastening tool according to the present embodiment, Figs. 4A to 4C are cross-sectional perspective views showing an example of the main part configuration of the fastening tool according to the present embodiment, and Fig. 5 is a top cross-sectional view showing an example of the main part configuration of the fastening tool according to the present embodiment, and shows details of the bit holding part 3 and the first driving part 4. Next, with reference to each figure, the bit holding part 3 and the first driving part 4 will be described.

[0026] The bit holding part 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 indicated by arrows A1 and A2 along the axial direction of the driver bit 2 and rotates together with the holding member 30, a moving member 32 that moves the holding member 30 in the front-rear direction along the rotation guide member 31, and a biasing member 33 that biases the moving member 32 in the rear direction indicated by the arrow A2.

[0027] The holding member 30 is configured by a columnar member, for example, whose outer diameter is slightly smaller than the inner diameter of the rotation guide member 31 and is inserted inside the rotation guide member 31. The holding member 30 is provided with an opening 30a having a shape that matches the cross-sectional shape of the driver bit 2 at the front end along the axial direction of the driver bit 2. The holding member 30 includes a detachable holding mechanism 30c for detachably holding the driver bit 2 at the opening 30a. The opening 30a of the holding member 30 is exposed inside the rotation guide member 31, and the driver bit 2 is detachably inserted into the opening 30a.

[0028] The rotary guide member 31 extends along the front-rear direction indicated by the arrows A1 and A2 along the extending direction of the tool body 10, that is, the axial direction of the driver bit 2. The rotary guide member 31 has a cylindrical shape into which the holding member 30 fits inside, and the front end thereof is rotatably supported via a bearing 34a, which is an example of a bearing, 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. Further, the rear end of the rotary guide member 31 is connected to the first drive unit 4.

[0029] The rotary guide member 31 has groove portions 31a formed at two locations on the side portions facing each other in the radial direction, which extend in the front-rear direction indicated by the arrows A1 and A2 along the axial direction of the driver bit 2. The rotary 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 groove portions 31a, so that the rotary guide member 31 is connected to the holding member 30 via the connecting members 30b.

[0030] The holding member 30 is provided with a hole penetrating in a direction perpendicular to the rotation direction of the driver bit 2, and the connecting member 30b is inserted into this hole and fixed with a pin 30f. The connecting member 30b is composed of a cylindrical member having an oval cross-sectional shape.

[0031] The longitudinal direction of the oval shape of the connecting member 30b is along the extending direction of the groove portion 31a parallel to the axial direction of the driver bit 2 indicated by the arrows A1 and A2, and the short transverse direction of the oval shape is in a direction perpendicular to the extending direction of the groove portion 31a indicated by the arrows B1 and B2, that is, in the rotation direction of the rotary guide member 31. And the width in the short transverse direction of the oval shape of the connecting member 30b, that is, the width along the rotation direction of the rotary guide member 31, is configured to be slightly smaller than the width along the same direction of the groove portion 31a.

[0032] As a result, the connecting member 30b placed in the groove portion 31a is supported by the groove portion 31a so as to be movable along the axial direction of the rotary guide member 31. Further, the connecting member 30b is restricted from moving in the rotational direction with respect to the rotary guide member 31 between one side surface and the other side surface of the groove portion 31a along the extending direction of the groove portion 31a. Therefore, the connecting member 30b is pushed by one side surface or the other side surface of the groove portion 31a according to the rotational direction of the rotary guide member 31 by the operation of the rotary guide member 31 rotating, and receives a circumferential force in the rotational direction from the rotary guide member 31.

[0033] Therefore, when the rotary guide member 31 rotates, the holding member 30 rotates together with the rotary guide member 31 because the connecting member 30b is pushed by the groove portion 31a of the rotary guide member 31. Further, the holding member 30 is guided by the groove portion 31a of the rotary guide member 31 and moves in the front-rear direction along the axial direction of the driver bit 2.

[0034] 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 front-rear direction along the rotary 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 via the bearing 32b, and a buffer member 32d attached to the rear side of the second moving member 32c.

[0035] The first moving member 32a is configured by, for example, a cylindrical member having an inner diameter slightly larger than the outer diameter of the rotary guide member 31 and being inserted outside the rotary guide member 31. The first moving member 32a is connected to the holding member 30 via the connecting member 30b protruding from the groove portion 31a of the rotary guide member 31, and is supported so as to be movable along the axial direction of the rotary guide member 31.

[0036] The bearing 32b is an example of a bearing and is inserted between the outer periphery of the first moving member 32a and the inner periphery of the second moving member 32c. The first moving member 32a constitutes a bearing inner ring holding member that holds the inner ring of the bearing 32b, and the second moving member 32c constitutes a bearing outer ring holding member that holds the outer ring of the bearing 32b. The inner ring of the bearing 32b is supported by the outer periphery of the first moving member 32a so as to be unable to move in the rotational direction and the axial direction, and the outer ring is supported by the inner periphery of the second moving member 32c so as to be unable to move in the rotational direction and the axial direction.

[0037] As a result, the second moving member 32c is connected to the first moving member 32a via the bearing 32b in a state where the movement in the front-rear direction along the axial direction is restricted. Also, the second moving member 32c rotatably supports the first moving member 32a via the bearing 32b.

[0038] Therefore, the first moving member 32a is pushed by the second moving member 32c via the bearing 32b during the operation of the second moving member 32c moving 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 that does not rotate with respect to the rotation guide member 31.

[0039] The biasing member 33 is constituted by a coil spring in this example, and is placed between the front frame 10b provided on the front side of the case 10a of the tool body 10 outside the rotation guide member 31 and the second moving member 32c of the moving member 32, and abuts against a spring seat 32f 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 in the forward direction indicated by the arrow A1, and biases the moving member 32 in the backward direction indicated by the arrow A2.

[0040] 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 rotation guide member 31, the holding member 30, and the driver bit 2 held by the holding member 30.

[0041] 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. The shaft 41a of the speed reducer 41 is supported by the rear frame 10c via a bearing 42. The rotation guide member 31 has its rear end connected to the shaft 41a of the speed reducer 41, and the shaft 41a is supported by the rear frame 10c via the bearing 42, so that the rotation guide member 31 is rotatably supported via the bearing 42, which is an example of a bearing.

[0042] The bit holding part 3 and the first drive unit 4 are integrally assembled by connecting the front frame 10b and the rear frame 10c with a coupling member 10d extending in the front-rear direction, and the front frame 10b is fixed to the case 10a of the tool body 10 with screws 10e.

[0043] Also, in the bit holding part 3, the front end of the rotation guide member 31 is supported by the front frame 10b fixed to 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 fixed to 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 has the rotation guide member 31 rotatably supported by the tool body 10.

[0044] As a result, the first drive unit 4 rotates the rotary guide member 31 by the bit rotation motor 40. When the rotary guide member 31 rotates, the holding member 30 that holds the driver bit 2 rotates together with the rotary guide member 31 because the connecting member 30b is pushed into the groove portion 31a of the rotary guide member 31.

[0045] The bit holding portion 3 is provided with a guide member 32g on the second moving member 32c. The coupling member 10d is provided with a pair of guide wall portions 10g at a slightly larger interval than the diameter of the guide member 32g, and the guide member 32g enters between the pair of guide wall portions 10g, so that the pair of guide wall portions 10g face the peripheral surface of the guide member 32g.

[0046] As a result, the second moving member 32c is movable in the front-rear direction indicated by the arrows A1 and A2 along the axial direction of the driver bit 2 because the guide member 32g is guided by the coupling member 10d, and the rotation following the rotary guide member 31 is restricted.

[0047] FIGS. 6A and 6B are upper surface cross-sectional views showing an example of the internal structure of the fastening tool of the present embodiment, and show details of the second drive unit 5. Next, the second drive unit 5 will be described with reference to each figure.

[0048] The second drive unit 5 includes a bit movement motor 50 driven by electricity supplied from the battery 12 and a speed reducer 51. The bit movement motor 50 is an example of a motor and a second motor. The shaft 50a of the bit movement 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 rotating member. The second drive unit 5 is supported by the tool body 10 via the pulley 52 and a bearing 53. The shaft 50a of the bit movement motor 50 of the second drive unit 5 is arranged along the extending direction of the handle 11.

[0049] The second drive unit 5 is an example of a transmission member. One end of a linear wire 54 is connected to a pulley 52, and as the pulley 52 rotates, the wire 54 is wound along the outer circumference 52a of the pulley 52. The other end of the wire 54 is connected to a wire connection portion 32h provided on a second moving member 32c of the moving member 32. As long as the transmission member has flexibility and is wound along the outer circumference of a rotating member such as the pulley 52, it may be a string made of fibers or the like, a belt made of rubber or the like, or a chain made of metal or the like. When the transmission member is composed of a chain, the rotating member may be a sprocket having a tooth portion.

[0050] 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 in the forward direction indicated by the arrow A1. When 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 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, and the driver bit 2 held by the holding member 30 moves forward in the forward direction indicated by the arrow A1.

[0051] The second drive unit 5 is arranged to be offset to one side with respect to the approximate center in the left-right direction of the fastening tool 1 such that the tangent direction of the portion of the pulley 52 around which the wire 54 is wound is along the extending direction of the rotation guide member 31. That is, the center of the pulley 52, in this example, the axis 50a of the bit moving motor 50, is offset to one side with respect to the rotation guide member 31, and when viewed from the axial direction of the pulley 52, the outer circumference 52a of the pulley 52 around which the wire 54 is wound overlaps with the rotation guide member 31.

[0052] Further, as shown in FIGS. 6A and 6B, the wire 54 between the pulley 52 and the second moving member 32c is parallel to the axial direction of the rotary guide member 31 in the radial direction of the pulley 52, and as shown in FIG. 1A, it is also parallel to the axial direction of the pulley 52 in the axial direction of the bit moving motor 50 orthogonal to the radial direction of the pulley 52. The pulley 52 and the like are arranged so as to be parallel to the axial direction of the rotary guide member 31.

[0053] Furthermore, when the wire 54 is wound around the pulley 52 in layers, the distance from the center of the pulley 52 to the wire 54 changes according to the number of windings, so the amount of movement of the driver bit 2 when the pulley 52 makes one rotation changes. Also, the angle formed by the direction in which the wire 54 extends between the pulley 52 and the second moving member 32c and the moving direction of the driver bit 2 along the axial direction of the rotary guide member 31 changes.

[0054] Therefore, the diameter of the pulley 52 and the like are set so that the rotation amount α of the pulley 52 required to move the driver bit 2 by a predetermined amount is less than 360° by moving the moving member 32 from one end to the other end within the movable range along one direction.

[0055] As a result, in order to move the driver bit 2 by a predetermined amount, in the operation of the pulley 52 winding up the wire 54, as shown in FIG. 6B, the wire 54 is not wound around the pulley 52 in layers, and it is possible to suppress the inaccuracy of the movement amount of the driver bit 2. Also, a change in the parallelism between the direction in which the wire 54 extends between the pulley 52 and the second moving member 32c and the moving direction of the driver bit 2 along the axial direction of the rotary guide member 31 is suppressed.

[0056] Therefore, the relationship between the rotation amount of the bit moving motor 50 and the movement amount of the holding member 30 becomes a one-to-one relationship throughout the entire movable range of the holding member 30. By controlling the rotation amount of the bit moving motor 50, the movement amount of the holding member 30 along the axial direction of the rotary guide member 31 can be controlled. That is, by controlling the rotation amount of the bit moving motor 50, the movement amount of the driver bit 2 attached to the holding member 30 can be controlled.

[0057] Further, regardless of the amount of wire 54 wound, the tension applied to wire 54 is always parallel to the moving direction of driver bit 2 along the axial direction of rotary guide member 31, and it is possible to suppress a decrease in the transmission efficiency of the force for moving driver bit 2 and pushing screw 200 via driver bit 2.

[0058] As a result, wire 54 between pulley 52 and the second moving member 32c extends linearly along the moving direction of moving member 32, and an increase in load when winding wire 54 around pulley 52 and an increase in load when pulling wire 54 out from pulley 52 are suppressed.

[0059] Note that since wire 54 has flexibility that allows it to be wound around pulley 52, it cannot push second moving member 32c to move moving member 32 rearward. Therefore, an urging member 33 is provided that applies a force to moving member 32 to push it in the rearward direction indicated by arrow A2 by moving moving member 32 forward in the direction indicated by arrow A1 and compressing it. As a result, in a configuration where wire 54 is wound around pulley 52 and driver bit 2 is advanced, driver bit 2 after advancement can be retracted.

[0060] Also, holding member 30 that holds driver bit 2 is supported so as to be movable in the front-rear direction with respect to rotary guide member 31 by the engagement between connecting member 30b provided on holding member 30 and groove portion 31a provided on rotary guide member 31, and rotates together with rotary guide member 31.

[0061] Therefore, in a configuration where bit rotation motor 40 is arranged coaxially with rotary guide member 31 and holding member 30 and driver bit 2 held by holding member 30, it is possible to realize a configuration in which driver bit 2 is rotated and driver bit 2 is moved in the front-rear direction without moving bit rotation motor 40 in the front-rear direction.

[0062] In addition, in a configuration where the bit rotation motor 40 is arranged coaxially with the driver bit 2, a configuration can be considered in which the rotational operation of the bit rotation motor 40 is converted into the forward and backward movement of the driver bit 2 by using a feed screw.

[0063] However, in a configuration using a feed screw, since the forward movement amount of the driver bit 2 per motor rotation cannot be increased, it is difficult to increase the movement speed of the driver bit 2 even if the rotation speed of the motor is increased.

[0064] In the fastening tool 1, in order to shorten the time until the screw 200 is pressed against the object to be fastened by the driver bit 2, it is necessary to increase the movement speed of the driver bit 2. However, in a configuration using a feed screw, it is difficult to shorten the time until the screw 200 is pressed against the object to be fastened by the driver bit 2.

[0065] On the other hand, in a configuration where the holding member 30 that holds the driver bit 2 is supported so as to be movable in the front-rear direction with respect to the rotary guide member 31, the pulley 52 is rotated by the second drive unit 5 to wind up the wire 54, and the holding member 30 is moved forward, the movement speed of the driver bit 2 can be increased according to the rotation speed of the bit movement motor 50. Therefore, the time until the screw 200 is pressed against the object to be fastened by the driver bit 2 can be shortened.

[0066] FIG. 7A and FIG. 7B are cross-sectional views showing an example of the detachable holding mechanism, and FIG. 8A and FIG. 8B are perspective views showing an example of the detachable holding mechanism, and show the details of the detachable holding mechanism 30c. Next, the detachable holding mechanism 30c will be described with reference to each figure.

[0067] The detachable holding mechanism 30c includes a ball 30d exposed in the opening 30a and a spring 30e that presses the ball 30d in the direction of being exposed in the opening 30a. The spring 30e is an example of a pressing member and is composed of a biasing member such as a leaf spring or a coil, an elastic member such as rubber, and in this example, is composed of an annular leaf spring and is fitted to the outer periphery of the holding member 30.

[0068] When the insertion part 20 of the driver bit 2 is inserted into the opening 30a of the holding member 30, the detachable holding mechanism 30c causes the ball 30d pushed by the insertion part 20 to retract in the outer peripheral direction of the holding member 30 while deforming the annular spring 30e in the direction in which the diameter of the spring 30e increases.

[0069] When the insertion part 20 of the driver bit 2 is inserted into the opening 30a of the holding member 30 until the groove part 20a formed on the outer periphery of the insertion part 20 faces the ball 30d, the ball 30d biased by the spring 30e fits into the groove part 20a. As a result, the driver bit 2 is prevented from accidentally coming out of the holding member 30.

[0070] Also, when a force equal to or greater than a predetermined value is applied in the direction of pulling out the driver bit 2 from the holding member 30, the ball 30d retracts while deforming the annular spring 30e in the direction in which the diameter of the spring 30e increases, so that the driver bit 2 can be pulled out from the holding member 30.

[0071] In the operation of inserting and removing the insertion part 20 of the driver bit 2 into and from the opening 30a of the holding member 30, the ball 30d retracts in the outer peripheral direction of the holding member 30. For this reason, a space for the ball 30d to retract is required on the outer periphery of the holding member 30. On the other hand, the holding member 30 is inserted inside the cylindrical rotation guide member 31, and a space for the ball 30d to retract cannot be secured between the outer periphery of the holding member 30 and the inner periphery of the rotation guide member 31.

[0072] Also, in order to secure a space for the ball 30d to retract between the outer periphery of the holding member 30 and the inner periphery of the rotation guide member 31, if the diameter difference between the holding member 30 and the rotation guide member 31 is set, since the radial dimension of the driver bit 2 is determined and the outer diameter of the holding member 30 cannot be reduced, it is necessary to increase the outer diameter of the rotation guide member 31. For this reason, the device becomes larger.

[0073] In contrast, the rotary guide member 31 is provided with a groove portion 31a for guiding the connecting member 30b. The groove portion 31a penetrates through from the inner peripheral side to the outer peripheral side of the rotary guide member 31 and extends in the axial direction of the rotary guide member 31.

[0074] Therefore, in the attachment / detachment holding mechanism 30c, the ball 30d is provided in accordance with the position of the groove portion 31a of the rotary guide member 31. That is, the holding member 30, the connecting member 30b, and the ball 30d of the attachment / detachment holding mechanism 30c are provided coaxially along the axial direction of the rotary guide member 31. Thereby, in any of the operations where the rotary guide member 31 and the holding member 30 rotate and the operation where the holding member 30 moves axially with respect to the rotary guide member 31, the ball 30d is exposed in the groove portion 31a of the rotary guide member 31.

[0075] Therefore, in the operation where the insertion portion 20 of the driver bit 2 is inserted into and removed from the opening 30a of the holding member 30, the ball 30d that retracts in the outer peripheral direction of the holding member 30 enters the groove portion 31a of the rotary guide member 31.

[0076] Thus, in a configuration where the holding member 30 is inserted into the cylindrical rotary guide member 31, a space for the ball 30d of the attachment / detachment holding mechanism 30c to retract can be secured. Further, by also using the groove portion 31a into which the connecting member 30b enters as a space for the ball 30d to retract, the area of the opening provided in the rotary guide member 31 is suppressed, and strength can be ensured.

[0077] Furthermore, by increasing the diameter difference between the holding member 30 and the rotary guide member 31, it is not necessary to secure a space for the ball 30d to retract between the outer periphery of the holding member 30 and the inner periphery of the rotary guide member 31, and an increase in the size of the device can be suppressed.

[0078] FIG. 9 is a perspective view showing an example of the screw feed portion and the nose portion of the present embodiment, and shows details of the screw feed portion 7 and the nose portion 8. Next, the screw feed portion 7 and the nose portion 8 will be described with reference to the respective drawings.

[0079] The screw feed section 7 includes a screw feed motor 70, a pinion gear 71 attached to the shaft of the screw feed motor 70 via a speed reducer, a rack gear 72 meshing with the pinion gear 71, and an engaging portion 73 connected to the rack gear 72 and engaging with the connecting screw sent from the screw storage section 6.

[0080] In the screw feed section 7, the rack gear 72 is supported so as to be movable in the vertical direction along the feed direction of the connecting screw. When the screw feed motor 70 rotates forward and backward, the engaging portion 73 that engages with the connecting screw moves in the vertical direction, and the connecting screw is fed.

[0081] The nose portion 8 has an injection passage 80 through which the driver bit 2 passes and an injection port 81a communicating with the injection passage 80, and is supplied with the screw 200 by the screw feed section 7. The nose portion 8 includes a contact member 81 that contacts the 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. Further, the nose portion 8 includes a cover member 88 that can open and close the path through which the screw 200 passes from the screw storage section 6 to the injection passage 80.

[0082] The fastening tool 1 is configured such that each component constituting the injection passage 80, the contact member 81, and the contact arm 82 is assembled to form the nose portion 8, and is fixed to the front frame 10b and the nose main body portion 10f that constitute the tool body 10. The fastening tool 1 also includes a contact switch portion 84 that is actuated by being pushed by the contact arm 82.

[0083] In the nose portion 8, the contact member 81 is supported so as to be movable in the front-rear direction indicated by the arrows A1 and A2, and the contact arm 82 moves in the front-rear direction in conjunction with the contact member 81. The contact member 81 of the nose portion 8 is biased forward by a biasing member (not shown), and when the contact member 81 that has been pressed against the object to be fastened and moved backward is biased by the biasing member and moves forward.

[0084] The nose portion 8 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 portion 84 operates. The contact switch portion 84 switches the presence or absence of operation by being pressed by the contact arm 82. In this example, the contact switch portion 84 is not being pressed by the contact arm 82 and is in a non-operating state, which is defined as the contact switch portion 84 being off, and when the contact switch portion 84 is pressed by the contact arm 82 and operates, it is defined as the contact switch portion 84 being on.

[0085] Next, with reference to each figure, the configuration regarding the control and operation of the fastening tool 1 will be described. 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 fingers of the hand holding the handle 11. The trigger switch portion 90 operates when pressed by the trigger 9.

[0086] The trigger switch portion 90 switches the presence or absence of operation by being pressed by the trigger 9. In this example, when the trigger 9 has not been operated and the trigger switch portion 90 is not pressed by the trigger 9 and is in a non-operating state, it is defined as the trigger switch portion 90 being off, and when the trigger 9 is operated and the trigger switch portion 90 is pressed by the trigger 9 and operates, it is defined as the trigger switch portion 90 being on.

[0087] 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 when pressed by the contact member 81.

[0088] The control unit 100 is composed of a substrate on which various electronic components are mounted and is provided in a substrate storage portion 111 provided on the back side of the screw storage portion 6 between the screw storage portion 6 and the handle 11.

[0089] In a power tool that is used by holding the handle by hand, a storage portion for storing consumables such as screws is provided in front of the handle. And, in order to be able to grip the handle by hand, a space for a finger of the hand is required between the handle and the storage portion.

[0090] Therefore, the fastening tool 1 includes a board storage portion 111 on the back side of the screw storage portion 6 by utilizing the space between the screw storage portion 6 and the handle 11.

[0091] In a power tool that is used by holding the handle by hand, a configuration has been proposed in which a battery is attached to the lower part of the handle and a board is provided between the handle and the battery. With such a configuration, the vertical dimension of the power tool along the extending direction of the handle is increased.

[0092] On the other hand, by providing the board storage portion 111 on the back side of the screw storage portion 6, an increase in the vertical dimension of the fastening tool 1 along the extending direction of the handle 11 is suppressed. Further, since the screw storage portion 6 stores the connecting screws wound in a spiral shape, the surface of the screw storage portion 6 facing the handle 11 is substantially circular. Thereby, while suppressing an increase in the size of the fastening tool 1, the volume of the board storage portion 111 can be secured.

[0093] Figs. 10A to 10C are perspective views seen from the rear showing an example of the fastening tool of the present embodiment, and Fig. 11 is a perspective view showing an example of the setting portion, showing details of the setting portion 110. Next, the setting portion 110 will be described with reference to each figure.

[0094] The fastening tool 1 includes a second drive portion 5 that moves the driver bit 2 in the front-rear direction along the axial direction. The second drive portion 5 is driven by a bit movement motor 50, and a pulley 52 that rotates when driven by the bit movement motor 50 and a moving member 32 connected by a wire 54 and a holding member 30 connected to the moving member 32 move in the forward direction along the axial direction of the driver bit 2 along a rotation guide member 31.

[0095] 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 is 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.

[0096] Therefore, the fastening tool 1 includes a setting unit 110 for setting the forward movement amount of the driver bit 2. The setting unit 110 is an example of setting means, and is configured such that an arbitrary setting value can be selected from a plurality of setting values, or an arbitrary setting value can be selected steplessly.

[0097] In this example, the setting unit 110 is configured such that a setting value is selected by an operation unit 110a composed of buttons. Also, the operation unit 110a may be configured such that a setting value is selected by a rotary dial. Further, the setting unit 110 may be provided with a configuration for displaying the selected setting value by a method of indicating the current value by a label, engraving, etc., or a display unit 110b such as an LED so that the operator can easily grasp the current setting value.

[0098] The setting unit 110 is provided on both the left and right sides of the surface facing the handle 11 in a board storage unit 111 provided on the back side of the screw storage unit 6.

[0099] Thereby, when the fastening tool 1 is viewed from the rear, the setting unit 110 can be visually recognized from both the left and right sides of the handle 11.

[0100] In the usage mode where the handle 11 is held by hand, the surface of the screw storage portion 6 facing the handle 11 faces the operator holding the fastening tool 1. As a result, in the board storage portion 111 provided on the back side of the screw storage portion 6, by providing the setting portion 110 on the surface facing the handle 11, the display portion 110b provided on the setting portion 110 is easily visible. Therefore, the possibility that the operator misses the display can be reduced. The content displayed on the display portion 110b includes, in addition to the set value of the screw depth defined by the forward movement amount of the driver bit 2, the ON / OFF state of the power supply, the operation mode selected from various selectable operation modes, the presence or absence of a screw, the remaining amount of the screw, the presence or absence of an abnormality, and the like.

[0101] Also, in the usage mode where the handle 11 is held by hand, the operation portion 110a such as a button provided on the setting portion 110 is also easily visible. Therefore, while holding the handle 11 with one hand, the operation portion 110a can be operated with the other hand while visually recognizing the operation portion 110a, and the operation can be performed reliably. Further, the display portion 110b can be viewed without changing the posture or significantly changing the line of sight during work, thereby preventing the operator from missing a notification such as an alarm during continuous work. Also, it is possible to prevent the ejection port 81a from inadvertently facing the operator when the operator tries to stare at the display portion 110b or the operation portion 110a.

[0102] Furthermore, the board storage portion 111 houses the board constituting the control portion 100. On this board, by mounting switches and the like constituting the operation portion 110a, lamps and the like constituting the display portion 110b, etc. on the surface facing the handle 11, a board for the setting portion 110 can be omitted separately from the control portion 100.

[0103] <Operation Example of the Fastening Tool of the Present Embodiment> FIG. 12A is a side cross-sectional view showing an example of the operation of the fastening tool of the present embodiment, and FIG. 12B is a top cross-sectional view showing an example of the operation of the fastening tool of the present embodiment. Next, with reference to each figure, the fastening operation of the fastening tool of the present embodiment will be described.

[0104] In the standby state, as shown in Fig. 1A, 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.

[0105] When the contact member 81 is pressed against the object to be fastened, the contact switch portion 84 is pressed by the contact arm 82 and the contact switch portion 84 is turned on, and when the trigger 9 is operated and the trigger switch portion 90 is turned on, 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.

[0106] When the bit movement motor 50 is driven and rotates in the positive direction, which is one direction, the pulley 52 rotates in the positive direction and the wire 54 is wound around the pulley 52. As the wire 54 is wound around the pulley 52, the second moving member 32c connected to the wire 54 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.

[0107] 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.

[0108] As a result, the driver bit 2 held by the holding member 30 moves forward in the direction indicated by the arrow A1, engages with the screw 200 supplied to the nose portion 8, and moves the screw 200 forward to press it against the object to be fastened. Passage 80 to move the screw 200 forward and press it against the object to be fastened.

[0109] When the bit rotation motor 40 is driven to rotate in the forward direction, which is one 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 pushed 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.

[0110] 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., moves the driver bit 2 forward by the second drive unit 5 to cause the driver bit 2 to follow the screw being screwed into the object to be fastened.

[0111] As shown in FIGS. 12A and 12B, 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 determines 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.

[0112] When the bit movement motor 50 rotates in the reverse direction, which is the other direction, the pulley 52 rotates in the reverse direction, so that 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 has been compressed extends and pushes the second moving member 32c backward.

[0113] The second moving member 32c is pushed rearward by the biasing member 33, and is guided by the rotary guide member 31 to move rearward along the axial direction. 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.

[0114] 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.

[0115] 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 the second moving member 32c is directly prevented from hitting the rear frame 10c during the operation of the second moving member 32c moving rearward, 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 injection passage 80.

[0116] Figs. 13A to 13C are cross-sectional views showing the fastening state of the screw. Fig. 13A shows a so-called flush state where the head 201 of the screw 200 does not float or sink from the surface of the object to be fastened 202. Fig. 13B shows a state where the head 201 of the screw 200 floats from the object to be fastened 202. Fig. 13C shows a state where the head 201 of the screw 200 is buried in the object to be fastened 202.

[0117] 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. 13A, 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 202 to be fastened. Note that the screw 200 is not limited to a countersunk head screw, and for 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 202 to be fastened and the head 201 of the screw 200 does not float from the object 202 to be fastened.

[0118] 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 floating state from the object 202 to be fastened as shown in Fig. 13B, 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 202 to be fastened as shown in Fig. 13C, the forward movement amount of the driver bit 2 may be decreased to move the operation end position P2 backward.

[0119] Therefore, the movement amount (forward movement amount) of the driver bit 2 can be set by the setting unit 110. The movement amount (forward movement amount) of the driver bit 2 is defined by the rotation speed (rotation amount) of the bit movement motor 50. Then, 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, the operation end position P2 is controlled by stopping the rotation or reversing the bit movement motor 50. Therefore, the tightening depth can be adjusted.

Explanation of Reference Numerals

[0120] 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, 32a... First moving member, 32b... Bearing, 32c... Second moving member, 33... Biasing member, 34a... Bearing, 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 (rotating member), 52a... Outer circumference, 53... Bearing, 54... Wire (transmission member), 6... Screw storage part, 7... Screw feed part, 70... Screw feed motor, 71... Pinion gear, 72... Rack gear, 73... Engagement part, 8... Nose part, 80... Injection passage, 81... Contact member, 81a... Injection port, 82... Contact arm, 83... Adjustment part, 84... Contact switch part, 9... Trigger, 90... Trigger switch part, 100... Control part, 110... Setting part

Claims

1. A cylindrical rotating guide member that extends in one direction and is rotatably supported; An opening into which a driver bit is removably inserted, and a holding member that moves axially along the extending direction of the rotating guide member inside the rotating guide member and rotates together with the rotating guide member; A moving member that moves the holding member back and forth along the rotating guide member; A first drive unit having a first motor that rotates the rotating guide member; A second drive unit having a second motor that moves the moving member axially; and The first motor has a rotation axis arranged coaxially with the driver bit Fastening tool.

2. A tool body extending in one direction along the axial direction of the driver bit, A handle extending in another direction intersecting the extending direction of the tool body, and The rotation axis of the second motor is arranged along the extending direction of the handle The fastening tool according to claim 1.

3. The moving member is A first moving member connected to the holding member, rotating together with the holding member and the rotating guide member, and moving axially along the rotating guide member; A second moving member that rotatably supports the first moving member and moves axially along the rotating guide member Comprising The fastening tool according to claim 1 or claim 2.

4. The moving member, wherein the second moving member rotatably supports the first moving member via a bearing, and the second moving member moves the first moving member axially via the bearing The fastening tool according to claim 3.

5. The rotating guide member includes a groove extending axially, The holding member and the first moving member are connected via a connecting member that enters the groove, The connecting member is supported in the groove so as to be movable along the axial direction of the rotating guide member, and By the rotation of the rotating guide member, the connecting member is pushed against one side surface or the other side surface of the groove according to the rotation direction of the rotating guide member, thereby receiving a circumferential force from the rotating guide member The fastening tool according to claim 3 or claim 4.

Images