Fastening tool

Abstract

To provide a fastening tool that facilitates control of movements of a driver bit in a fastening direction of a screw.SOLUTION: A fastening tool 1 comprises: a holding member 30, to which a driver bit 2 is detachably attached, which moves in an axial direction of the driver bit 2 along an extending direction of a rotary guide member 31, inside the rotary guide member 31 and rotates together with the rotary guide member 31; 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; 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; a pulley 52 that is driven by a bit moving motor 50 to rotate; and wire 54 through which the pulley 52 is connected to the second moving member 32c, where the wire 54 extends in a direction parallel to the extending direction of 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 utilizes 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] Conventionally, there has been proposed a pneumatic screw driver that rotates a bit with an air motor and moves it in the direction of tightening the screw with air pressure (see, for example, Patent Document 1).

[0004] Since a tool that uses air pressure does not have a motor or the like, a substrate on which electronic components constituting a control circuit or the like are mounted is not required. On the other hand, it is necessary to connect an air hose for use, and the maneuverability deteriorates.

[0005] On the other hand, there has been proposed a screw driver 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

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] Either a screw driver using air pressure or a screw driver driving a screw by the biasing force of a spring has difficulty in controlling the amount of movement of a driver bit in the direction of tightening the screw.

[0008] In addition, in an electric screw driver used by holding a handle by hand, a configuration has been proposed in which a battery is attached to the lower part of the handle and a substrate is provided between the handle and the battery. However, with such a configuration, the dimension of the tool along the extending direction of the handle increases.

[0009] The present invention has been made to solve such problems, and an object thereof is to provide a fastening tool that facilitates control of the amount of movement of a driver bit in the direction of tightening a screw.

[0010] Another object of the present invention is to provide a fastening tool that suppresses an increase in the dimension of the tool along the extending direction of the handle.

Means for Solving the Problems

[0011] In order to solve the above-described problems, the present invention provides a fastening tool including a tool body extending in one direction, a handle extending in another direction intersecting the extending direction of the tool body, a storage portion provided on one side of the handle along the extending direction of the tool body and storing consumables, and a substrate storage portion provided on a surface of the storage portion facing the handle and storing a substrate.

[0012] In the present invention, the substrate storage portion is provided on the back side of the storage portion by using the space between the storage portion and the handle.

Effects of the Invention

[0013] In the present invention, by providing the substrate storage portion on the back side of the storage portion, an increase in the dimension of the fastening tool along the extending direction of the handle can be suppressed.

Brief Description of the Drawings

[0014]

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

[0015] Hereinafter, embodiments of the fastening tool of the present invention will be described with reference to the drawings.

[0016] <Configuration Example of the Fastening Tool of the Present Embodiment> FIG. 1A is a side cross-sectional view showing an example of the internal structure of the fastening tool of the present embodiment, FIG. 1B is a top cross-sectional view showing an example of the internal structure of the fastening tool of the present embodiment, and FIG. 1C is a front cross-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.

[0017] 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.

[0018] Further, the fastening tool 1 includes a screw storage portion 6 for storing the screws 200, a screw feeding portion 7 for feeding the screws stored in the screw storage portion 6, and a nose portion 8 that is pressed against an object to be fastened to which the screw 200 is fastened and through which the screw is ejected.

[0019] 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 the end of the handle 11 to which a battery 12 is detachably attached.

[0020] In the fastening tool 1, the tool body 10 extends in one direction along the axial direction of the driver bit 2 indicated by the 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 the 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 up - down 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.

[0021] The first drive portion 4 is provided behind the tool body 10, which is one side of the handle 11. Also, the second drive portion 5 is provided in front of the tool body 10, which is the other side of the handle 11.

[0022] The screw storage portion 6 stores a plurality of screws 200 connected by a connecting band and wound in a spiral shape as a connected screw.

[0023] FIG. 3A and FIG. 3B are perspective views showing an example of the main part configuration of the fastening tool of the present embodiment, FIGS. 4A to 4C are cross - sectional perspective views showing an example of the main part configuration of the fastening tool of the present embodiment, and FIG. 5 is a top cross - sectional view showing an example of the main part configuration of the fastening tool of the present embodiment, showing details of the bit holding portion 3 and the first drive portion 4. Next, with reference to each figure, the bit holding portion 3 and the first drive portion 4 will be described.

[0024] 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 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 arrow A2.

[0025] The holding member 30 is a member having a slightly smaller outer diameter than the inner diameter of the rotation guide member 31 and is, for example, a columnar member that can be 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.

[0026] The rotation guide member 31 extends along the extending direction of the tool body 10, that is, along the front-rear direction indicated by arrows A1 and A2 along the axial direction of the driver bit 2. The rotation guide member 31 has a cylindrical shape into which the holding member 30 can be inserted, 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 rotation guide member 31 is connected to the first drive unit 4.

[0027] The rotation guide member 31 has groove portions 31a formed at two locations on the side portions facing each other in the radial direction and extending in the front-rear direction indicated by arrows A1 and A2 along the axial direction of the driver bit 2. The rotation guide member 31 penetrates the holding member 30 in the radial direction, and the connecting members 30b protruding from both sides of the holding member 30 enter the groove portions 31a, so that the rotation guide member 31 is connected to the holding member 30 via the connecting members 30b.

[0028] The holding member 30 is provided with a hole that penetrates in a direction perpendicular to the rotation direction of the driver bit 2. A 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.

[0029] The longitudinal direction of the oval shape of the connecting member 30b is in 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 rotation 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 rotation guide member 31, is configured to be slightly smaller than the width along the same direction of the groove portion 31a.

[0030] Thereby, 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 rotation guide member 31. Also, the movement of the connecting member 30b in the rotation direction with respect to the rotation guide member 31 is restricted 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 rotation direction of the rotation guide member 31 by the operation of the rotation guide member 31 rotating, and receives a circumferential force in the rotation direction from the rotation guide member 31.

[0031] Therefore, when the rotation guide member 31 rotates, the holding member 30 rotates together with the rotation guide member 31 because the connecting member 30b is pushed by the groove portion 31a of the rotation guide member 31. Also, the holding member 30 is guided by the groove portion 31a of the rotation guide member 31 and moves in the front-rear direction along the axial direction of the driver bit 2.

[0032] The moving member 32 is an example of a transmission member, and together with the holding member 30, it rotates and includes a first moving member 32a that moves the holding member 30 back and forth along the rotation guide member 31, a second moving member 32c that is supported by the first moving member 32a via a bearing 32b and pushes the first moving member 32a via the bearing 32b, and a buffer member 32d attached to the rear side of the second moving member 32c.

[0033] The first moving member 32a is configured by a member such as a cylindrical member whose inner diameter is slightly larger than the outer diameter of the rotation guide member 31 and is inserted outside the rotation 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 rotation guide member 31, and is movably supported along the axial direction of the rotation guide member 31.

[0034] The bearing 32b is an example of a bearing and is inserted between the outer circumference of the first moving member 32a and the inner circumference 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 bearing 32b supports the inner ring so as to be unable to move in the rotational direction and the axial direction on the outer circumference of the first moving member 32a, and supports the outer ring so as to be unable to move in the rotational direction and the axial direction on the inner circumference of the second moving member 32c.

[0035] 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 with respect to the first moving member 32a. Also, the second moving member 32c rotatably supports the first moving member 32a via the bearing 32b.

[0036] Therefore, 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 that does not rotate with respect to the rotation guide member 31.

[0037] 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 rotary 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.

[0038] 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 rotary guide member 31. The first drive unit 4 has a configuration in which the speed reducer 41 uses planetary gears, and the bit rotation motor 40 is arranged coaxially with the rotary guide member 31, the holding member 30, and the driver bit 2 held by the holding member 30.

[0039] 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. The rotary 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 a bearing 42, so that the rotary guide member 31 is rotatably supported via the bearing 42 which is an example of a bearing.

[0040] The bit holding portion 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.

[0041] Further, in the bit holding portion 3, the front end of the rotary guide member 31 is supported via a bearing 34a by a front frame 10b fixed to the front side of the case 10a of the tool body 10, and the rear end of the rotary guide member 31 is supported via a shaft 41a and a bearing 42 by a rear frame 10c fixed to the rear side of the case 10a. Thus, the bit holding portion 3 is rotatably supported by the tool body 10 via the rotary guide member 31.

[0042] Accordingly, 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 by the groove portion 31a of the rotary guide member 31.

[0043] A guide member 32g is provided on the second moving member 32c of the bit holding portion 3. 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 circumferential surface of the guide member 32g.

[0044] Accordingly, the second moving member 32c is movable in the front-rear direction indicated by 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.

[0045] FIGS. 6A and 6B are upper cross-sectional views showing an example of the internal structure of the fastening tool according to 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.

[0046] 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 a bearing 53 with the pulley 52. The shaft 50a of the bit movement motor 50 in the second drive unit 5 is arranged along the extending direction of the handle 11.

[0047] One end of a linear wire 54 which is an example of a transmission member is connected to the pulley 52 in the second drive unit 5. When the pulley 52 rotates, the wire 54 is wound along the outer periphery 52a of the pulley 52. The other end of the wire 54 is connected to a wire connection part 32h provided on a second moving member 32c of the moving member 32. The transmission member may be a string made of fibers, a belt made of rubber, or a chain made of metal, etc., as long as it has flexibility and is wound along the outer periphery of a rotating member such as the pulley 52. When the transmission member is constituted by a chain, the rotating member may be a sprocket having a toothed part.

[0048] Thereby, the second drive unit 5 rotates the pulley 52 by the bit movement motor 50 and winds up the wire 54, so as to move the second moving member 32c in the forward direction indicated by the arrow A1. When the second moving member 32c moves in the forward direction, the first moving member 32a is pushed via the bearing 32b in the bit holding part 3, and the first moving member 32a moves in the forward direction along the axial direction together with the second moving member 32c. When the first moving member 32a moves in the forward direction, the holding member 30 connected via the connecting member 30b to the first moving member 32a moves in the forward direction, and the driver bit 2 held by the holding member 30 moves in the forward direction indicated by the arrow A1.

[0049] 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 tangential 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 shaft 50a of the bit movement 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 periphery 52a of the pulley 52 around which the wire 54 is wound overlaps with the rotation guide member 31.

[0050] Also, 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 rotation guide member 31 in the radial direction of the pulley 52, and as shown in FIG. 1A, the pulley 52 and the like are arranged such that it is also parallel to the axial direction of the rotation guide member 31 in the axial direction of the bit movement motor 50 which is orthogonal to the radial direction of the pulley 52.

[0051] Furthermore, when the wire 54 is wound overlappingly around the pulley 52, the distance from the center of the pulley 52 to the wire 54 changes according to the number of turns, so that the movement amount of the driver bit 2 when the pulley 52 makes one rotation changes. Also, the angle formed 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 rotation guide member 31 changes.

[0052] Therefore, the diameter of the pulley 52 and the like are set such 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.

[0053] As a result, in order to move the driver bit 2 by a predetermined amount, in the operation of the pulley 52 winding the wire 54, as shown in FIG. 6B, the wire 54 is not wound overlappingly on the pulley 52, and it is suppressed that the movement amount of the driver bit 2 becomes inaccurate. Further, 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 rotation guide member 31 is suppressed.

[0054] 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 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 rotation 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.

[0055] Further, regardless of the winding amount of the wire 54, the tension applied to the wire 54 always becomes parallel to the moving direction of the driver bit 2 along the axial direction of the rotation guide member 31, and a decrease in the transmission efficiency of the force for moving the driver bit 2 and pushing the screw 200 through the driver bit 2 can be suppressed.

[0056] As a result, the wire 54 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 the pulley 52 winds the wire 54 and an increase in the load when the wire 54 is pulled out from the pulley 52 are suppressed.

[0057] Note that since the wire 54 has flexibility that can be wound around the pulley 52, the second moving member 32c cannot be pushed to move the moving member 32 backward. Therefore, a biasing member 33 is provided that applies a force to the moving member 32 to push the moving member 32 in the backward direction indicated by the arrow A2 by compressing the moving member 32 when the moving member 32 moves in the forward direction indicated by the arrow A1. As a result, in a configuration in which the pulley 52 winds the wire 54 and the driver bit 2 moves forward, the driver bit 2 after moving forward can be moved backward.

[0058] Further, 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 by the engagement between a connecting member 30b provided on the holding member 30 and a groove portion 31a provided on the rotary guide member 31, and rotates together with the rotary guide member 31.

[0059] Therefore, in a configuration where the bit rotation motor 40 is arranged coaxially with the rotary guide member 31 and the holding member 30, and the driver bit 2 held by the holding member 30, it is possible to rotate the driver bit 2 and move the driver bit 2 in the front-rear direction without moving the bit rotation motor 40 in the front-rear direction.

[0060] In a configuration where the bit rotation motor 40 is arranged coaxially with the driver bit 2, a configuration is conceivable in which the rotational operation of the bit rotation motor 40 is converted into the movement of the driver bit 2 in the front-rear direction using a feed screw.

[0061] 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.

[0062] In the fastening tool 1, in order to shorten the time until the driver bit 2 presses the screw 200 against the object to be fastened, 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 driver bit 2 presses the screw 200 against the object to be fastened.

[0063] 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 driver bit 2 presses the screw 200 against the object to be fastened can be shortened.

[0064] Figures 7A and 7B are cross-sectional views showing an example of the detachable holding mechanism, and Figures 8A and 8B are perspective views showing an example of the detachable holding mechanism, which show the details of the detachable holding mechanism 30c. Next, the detachable holding mechanism 30c will be described with reference to each figure.

[0065] The detachable holding mechanism 30c includes a ball 30d exposed in the opening 30a and a spring 30e that presses the ball 30d in a direction in which it is 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, or an elastic member such as rubber. In this example, it is composed of an annular leaf spring and is fitted on the outer periphery of the holding member 30.

[0066] When the insertion portion 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 portion 20 to deform the spring 30e in a direction in which the diameter of the annular spring 30e increases, while retracting in the outer peripheral direction of the holding member 30.

[0067] When the insertion portion 20 of the driver bit 2 is inserted into the opening 30a of the holding member 30 until the groove portion 20a formed on the outer periphery of the insertion portion 20 reaches a position facing the ball 30d, the ball 30d biased by the spring 30e fits into the groove portion 20a. This prevents the driver bit 2 from accidentally coming out of the holding member 30.

[0068] Also, when a force greater than a predetermined value is applied in a direction to pull out the driver bit 2 from the holding member 30, the ball 30d retracts while deforming the spring 30e in a direction in which the diameter of the annular spring 30e increases, making it possible to pull out the driver bit 2 from the holding member 30.

[0069] In the operation where the insertion part 20 of the driver bit 2 is inserted into and removed from the opening 30a of the holding member 30, the ball 30d retracts in the outer peripheral direction of the holding member 30. Therefore, 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 into 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.

[0070] 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.

[0071] On the other hand, the rotation 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 rotation guide member 31 and extends in the axial direction of the rotation guide member 31.

[0072] Therefore, the detachable holding mechanism 30c is provided with the ball 30d in accordance with the position of the groove portion 31a of the rotation guide member 31. That is, the holding member 30 is provided coaxially with the connecting member 30b and the ball 30d of the detachable holding mechanism 30c along the axial direction of the rotation guide member 31. Thereby, in any of the operations where the rotation guide member 31 and the holding member 30 rotate and the holding member 30 moves axially with respect to the rotation guide member 31, the ball 30d is exposed in the groove portion 31a of the rotation guide member 31.

[0073] Therefore, in the operation where the insertion part 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 rotation guide member 31.

[0074] Therefore, in a configuration where the holding member 30 is inserted into the cylindrical rotating guide member 31, a space can be secured for the balls 30d of the detachable holding mechanism 30c to retract. Further, by using the groove portion 31a into which the connecting member 30b enters as the space for the balls 30d to retract, the area of the opening provided in the rotating guide member 31 can be suppressed, and strength can be ensured.

[0075] Furthermore, by increasing the diameter difference between the holding member 30 and the rotating guide member 31, it is not necessary to secure a space for the balls 30d to retract between the outer periphery of the holding member 30 and the inner periphery of the rotating guide member 31, and an increase in the size of the device can be suppressed.

[0076] 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, with reference to each drawing, the screw feed portion 7 and the nose portion 8 will be described.

[0077] The screw feed portion 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 fed from the screw storage portion 6.

[0078] In the screw feed portion 7, the rack gear 72 is supported so as to be movable in the vertical direction along the feed direction of the connecting screw. In the screw feed portion 7, 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.

[0079] 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 portion 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 portion 6 to the injection passage 80.

[0080] 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 constituting the tool body 10. Further, the fastening tool 1 includes a contact switch portion 84 that is actuated by being pushed by the contact arm 82.

[0081] 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. 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 moved rearward is biased by the biasing member and moves forward.

[0082] In the nose portion 8, the amount of movement 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 is actuated is adjusted by the adjustment portion 83. The contact switch portion 84 has its operation switched between on and off by being pushed by the contact arm 82. In this example, when the contact switch portion 84 is not being pushed by the contact arm 82 and is in a non-operating state, it is considered the off state of the contact switch portion 84, and when the contact switch portion 84 is pushed by the contact arm 82 and is in an operating state, it is considered the on state of the contact switch portion 84.

[0083] Next, with reference to the respective drawings, 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 is actuated 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 that holds the handle 11. The trigger switch portion 90 is actuated by being pushed by the trigger 9.

[0084] The trigger switch unit 90 is switched between operating and non-operating states by being pushed by the trigger 9. In this example, the trigger 9 is not operated, the trigger switch unit 90 is not pushed by the trigger 9, and the trigger switch unit 90 is in a non-operating state, which is defined as the off state of the trigger switch unit 90. When the trigger 9 is operated and pushed by the trigger 9 to activate the trigger switch unit 90, it is defined as the on state of the trigger switch unit 90.

[0085] 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 output of the trigger switch unit 90 that is activated by operating the trigger 9 and the contact switch unit 84 that is activated by being pushed by the contact member 81.

[0086] The control unit 100 is composed of a substrate on which various electronic components are mounted, and is provided in a substrate storage unit 111 provided on the back side of the screw storage unit 6 between the screw storage unit 6 and the handle 11.

[0087] In a power tool that is held by hand and used, a storage unit 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 the fingers of the hand is required between the handle and the storage unit.

[0088] Therefore, the fastening tool 1 includes a substrate storage unit 111 on the back side of the screw storage unit 6 by utilizing the space between the screw storage unit 6 and the handle 11.

[0089] In a power tool that is held by hand and used, a configuration has been proposed in which a battery is attached to the lower part of the handle and a substrate 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 increases.

[0090] On the other hand, by providing the board storage part 111 on the back side of the screw storage part 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 part 6 stores the spiral connecting screws, the surface of the screw storage part 6 facing the handle 11 is substantially circular. Thereby, the volume of the board storage part 111 can be secured while suppressing an increase in the size of the fastening tool 1.

[0091] 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 part, showing details of the setting part 110. Next, the setting part 110 will be described with reference to each drawing.

[0092] The fastening tool 1 includes a second drive part 5 that moves the driver bit 2 in the front-rear direction along the axial direction. The second drive part 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 rotary guide member 31.

[0093] Thereby, 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.

[0094] Therefore, the fastening tool 1 includes a setting part 110 that sets the forward movement amount of the driver bit 2. The setting part 110 is an example of setting means, and an arbitrary setting value can be selected from a plurality of setting values, or an arbitrary setting value can be selected steplessly.

[0095] In this example, the setting unit 110 is configured such that a set value is selected by an operation unit 110a composed of buttons. Also, the operation unit 110a may be configured such that a set value is selected by a rotary dial. Further, 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 by a display unit 110b such as an LED so that the operator can easily grasp the current set value.

[0096] 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.

[0097] Thereby, when the fastening tool 1 is viewed from the rear, it is possible to visually recognize the setting unit 110 from both the left and right sides of the handle 11.

[0098] In a usage form where the handle 11 is held by hand, the surface of the screw storage unit 6 facing the handle 11 faces the operator holding the fastening tool 1. Thereby, by providing the setting unit 110 on the surface of the board storage unit 111 provided on the back side of the screw storage unit 6 facing the handle 11, the display unit 110b provided on the setting unit 110 is easily visible. Therefore, the possibility that the operator misses the display can be reduced. Note that the content displayed on the display unit 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, etc.

[0099] In addition, in the usage mode of holding the handle 11 by hand, the operation unit 110a such as a button provided in the setting unit 110 is also easily visible to the line of sight. Therefore, while holding the handle 11 with one hand, the operation unit 110a can be operated with the other hand while visually recognizing the operation unit 110a, and the operation can be performed reliably. Further, the display unit 110b can be viewed without changing the posture or significantly changing the line of sight during work, thereby preventing the operator from missing notifications such as alarms during continuous work. In addition, it is possible to prevent the ejection port 81a from inadvertently facing the operator when the operator tries to stare at the display unit 110b or the operation unit 110a.

[0100] Furthermore, the substrate storage unit 111 stores the substrate constituting the control unit 100. In this substrate, by mounting switches and the like constituting the operation unit 110a, lamps and the like constituting the display unit 110b on the surface facing the handle 11, a substrate for the setting unit 110 can be omitted separately from the control unit 100.

[0101] <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.

[0102] In the standby state, as shown in FIG. 1A, the tip of the driver bit 2 of the fastening tool 1 is located at the standby position P1 behind the injection passage 80, and the screw 200 can be supplied to the injection passage 80.

[0103] 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 and the contact switch unit 84 is turned on, and when the trigger 9 is operated and the trigger switch unit 90 is turned on, the control unit 100 drives the bit movement motor 50 of the second drive unit 5 and drives the bit rotation motor 40 of the first drive unit 4 at a predetermined timing.

[0104] When the bit movement motor 50 is driven to rotate 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. When the wire 54 is wound around the pulley 52, the second moving member 32c connected to the wire 54 is guided by the rotation guide member 31 and moves in the forward direction along the axial direction. When the second moving member 32c moves in the forward direction, the first moving member 32a is pushed by the second moving member 32c via the bearing 32b, and together with the second moving member 32c, it moves in the forward direction along the axial direction while compressing the biasing member 33.

[0105] When the first moving member 32a moves in the forward direction, 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 rotation guide member 31 and moves in the forward direction along the axial direction of the driver bit 2.

[0106] As a result, the driver bit 2 held by the holding member 30 moves in the forward direction indicated by the arrow A1, engages with the screw 200 supplied to the injection passage 80 of the nose portion 8, and moves the screw 200 in the forward direction to press against the object to be fastened.

[0107] When the bit rotation motor 40 is driven to rotate in the positive direction which is one direction, the rotation guide member 31 rotates in the positive direction. When the rotation guide member 31 rotates in the positive direction, the connecting member 30b connected to the holding member 30 is pushed by the groove portion 31a of the rotation guide member 31, and the holding member 30 rotates together with the rotation guide member 31.

[0108] As a result, the driver bit 2 held by the holding member 30 rotates the screw 200 in the positive 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., moves the driver bit 2 in the forward direction by the second drive unit 5 to cause the driver bit 2 to follow the screw being screwed into the object to be fastened.

[0109] As shown in FIGS. 12A and 12B, when the tip of the driver bit 2 protrudes from the injection port 81a of the contact member 81 and reaches a predetermined operation end position P2, the control unit 100 stops driving the bit rotation motor 40 and reverses the bit 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.

[0110] 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 expands and pushes the second moving member 32c backward.

[0111] 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.

[0112] When the first moving member 32a moves backward, 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 backward along the axial direction of the driver bit 2.

[0113] 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. Note that 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 where the second moving member 32c moves rearward, the second moving member 32c is prevented from directly hitting the rear frame 10c, and generation of sound 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.

[0114] 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.

[0115] When the tip of the driver bit 2 of the fastening tool 1 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 is flush with the surface of the object to be fastened 202. 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 to be fastened 202 and the head 201 of the screw 200 does not float from the object to be fastened 202.

[0116] When the tip of the driver bit 2 reaches the operation end position P2 and the head 201 of the screw 200 is floating 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 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.

[0117] 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

[0118] 1... Fastening tool, 10... Tool body, 10a... Case, 10b... Front frame, 10c... Rear frame, 10d... Coupling member, 10e... Screw, 10f... Nose main 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 tool body extending in one direction; A handle extending in another direction intersecting the extension direction of the tool body; a storage section provided on one side of the handle along an extension direction of the tool body, in which consumables are stored; a substrate storage section provided on a surface of the storage section facing the handle, the substrate storage section storing a substrate; A fastening tool comprising:

2. The board storage section has a display section on a surface facing the handle. The fastening tool according to claim 1 .

3. The display unit is provided on the substrate. The fastening tool according to claim 2.

4. The board storage section has an operation section on a surface facing the handle. The fastening tool according to any one of claims 1 to 3.

5. The operation unit is provided on the substrate. The fastening tool according to claim 4.

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