JP2022135119A - fastening tool - Google Patents

Abstract

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

Description

TECHNICAL FIELD The present invention relates to a fastening tool that engages a screw with a driver bit, presses the screw against an object to be fastened with the driver bit, and rotates the driver bit to screw the screw.

A tool called a portable driving tool is known that uses the air pressure of compressed air supplied from an air compressor or the combustion pressure of gas to sequentially drive out connecting fasteners loaded in a magazine from the tip of a driver guide. there is

As a driving machine that uses gas combustion pressure, there is a driving machine that can be used cordlessly by mounting a small gas cylinder on the driving machine body, and a screw driving machine that uses a screw as a connecting fastener for driving is proposed. (See, for example, Patent Document 1).

Further, a screw driving machine has been proposed in which a spring is compressed by the driving force of a motor that rotates a screw, and the screw is driven by the force of the spring (see, for example, Patent Document 2).

Since it is not easy to adjust the operating range of the piston with impact tools that drive screws, etc., using the combustion pressure of gas or the air pressure of compressed air, the distance between the tool body and the target to be driven must be adjusted. , and a driving depth adjusting device has been proposed in which the driving depth is adjusted and the height (protrusion length) of a push lever that abuts on the driving object can be adjusted (see, for example, Patent Document 3). .

In addition, since the adjusting mechanism for adjusting the driving depth is mechanically connected to a member called a contact arm or a push lever that strikes the driving object, it is necessary to arrange it near the contact arm. A contact arm guide mechanism has been proposed in which the mechanism is arranged on the side surface of the nose portion to prevent deformation of the contact arm (see, for example, Patent Document 4).

Furthermore, in a screwdriver that does not have an advance mechanism for the driver bit, when the screw reaches a predetermined screw-in depth due to the backward movement of the nose part, the start switch of the drive motor is turned off in relation to the adjustment rod and the switching rod. An automatic stop mechanism for a drive motor has been proposed that includes a switching plate that allows the driver bit to stop rotating by mechanically turning off the switch (see, for example, Patent Document 5).

Patent No. 5590505 Patent No. 6197547 Jitsukaihei 3-47781 Japanese Patent Application Laid-Open No. 2002-346947 JP-A-7-266246

In a configuration in which the length of protrusion of the contact arm is mechanically adjustable, the number of parts increases and the weight also increases. Moreover, the range in which the protruding length of the contact arm can be adjusted is narrow, and the accuracy of adjustment cannot be increased. Furthermore, in impact tools that use the combustion pressure of gas or the pneumatic pressure of compressed air to drive screws, etc., the forward position of the piston that advances the driver bit is regulated by an elastic member such as rubber. The driving depth is not stable due to external factors such as the temperature of the elastic member and the temperature of the elastic member. In addition, since the place where the adjusting mechanism can be arranged is limited to the vicinity of the nose portion, the tip side of the tool becomes large. Furthermore, since the place where the operation part such as the dial for operating the adjustment mechanism is arranged is limited to the vicinity of the nose part, it cannot be said that the depth adjustment operability is optimized.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fastening tool capable of electrically controlling the amount of axial movement of a driver bit.

In order to solve the above-described problems, the present invention provides a bit holding portion having a holding member that holds a driver bit rotatably and axially movably, and a driver bit held by the holding member in the bit holding portion. a first drive having a first motor for rotating the driver bit; a second drive having a second motor for axially moving the driver bit; and axially moving the driver bit. and a controller for controlling the amount of rotation by the amount of rotation of the second motor.

In the present invention, the driver bit held by the holding member in the bit holding portion is moved along the axial direction by the second motor, and the amount of movement along the axial direction is controlled by the amount of rotation of the second motor. be.

In the present invention, the amount of movement of the driver bit along the axial direction can be controlled by the amount of rotation of the motor that moves the driver bit in the axial direction. As a result, an increase in the number of mechanical parts can be suppressed, and an increase in weight can also be suppressed. In addition, since the adjustment mechanism having a mechanical configuration is not arranged near the nose portion, an increase in the size of the tip side of the tool can be suppressed, thereby facilitating visual recognition of the screw driving position. Furthermore, the range in which the amount of movement of the driver bit along the axial direction can be adjusted can be widened, and the accuracy of adjustment of the driving depth of the screw can be increased. In addition, since the forward position of the driver bit is not restricted by an elastic member such as rubber, the influence of external factors such as the environmental temperature and the temperature of the elastic member is suppressed, and the driving depth of the screw is stabilized. Furthermore, since the amount of movement of the driver bit along the axial direction can be set by an electric signal, there are few restrictions on the arrangement of the means for setting the amount of movement, and the operability of adjusting the driving depth of the screw is taken into account. Easy to optimize.

FIG. 2 is a side cross-sectional view showing an example of the internal structure of the fastening tool of the present embodiment; It is a partially broken perspective view showing an example of the internal structure of the fastening tool of the present embodiment. It is a partially broken perspective view showing an example of the internal structure of the fastening tool of the present embodiment. It is a partially broken perspective view showing an example of the internal structure of the fastening tool of the present embodiment. 1 is a side view showing an example of a fastening tool of this embodiment; FIG. It is a front view which shows an example of the fastening tool of this Embodiment. FIG. 3 is a top view showing an example of the fastening tool of the present embodiment; It is a perspective view which shows an example of the fastening tool of this Embodiment. It is a perspective view which shows an example of the fastening tool of this Embodiment. It is a perspective view which shows the detail of the screw feed part of this Embodiment. FIG. 4 is a perspective view showing an example of the nose portion of the present embodiment; FIG. 4 is a perspective view showing an example of the nose portion of the present embodiment; FIG. 4 is a side cross-sectional view showing an example of the operation of the fastening tool of the present embodiment; It is a partially broken perspective view showing an example of the operation of the fastening tool of the present embodiment. It is a partially broken perspective view showing an example of the operation of the fastening tool of the present embodiment. FIG. 4 is a perspective view showing an example of the attachment/detachment operation of the driver bit in the fastening tool of the present embodiment; FIG. 4 is a perspective view showing an example of the attachment/detachment operation of the driver bit in the fastening tool of the present embodiment; It is a sectional side view which shows the modification of the fastening tool of this Embodiment. FIG. 5 is a side cross-sectional view showing another modification of the fastening tool of the present embodiment; FIG. 4 is a block diagram showing a modified example of the fastening tool of the present embodiment; It is a sectional view showing a fastening state of a screw. It is a sectional view showing a fastening state of a screw. It is a sectional view showing a fastening state of a screw. It is a top view which shows an example of a setting part. 9 is a flow chart showing an operation example of a fastening tool according to a modification of the present embodiment; It is a perspective view which shows the modification of the installation position of a setting part. It is a perspective view which shows the modification of the installation position of a setting part. It is a perspective view which shows the modification of the installation position of a setting part. It is a perspective view which shows the modification of the installation position of a setting part.

Embodiments of the fastening tool of the present invention will be described below with reference to the drawings.

<Configuration example of the fastening tool of the present embodiment>
FIG. 1 is a side cross-sectional view showing an example of the internal structure of the fastening tool of the present embodiment, and FIGS. 2A to 2C are partially broken perspective views showing examples of the internal structure of the fastening tool of the present embodiment. . Further, FIG. 3A is a side view showing an example of the fastening tool of the present embodiment, FIG. 3B is a front view showing an example of the fastening tool of the present embodiment, and FIG. 3C is a fastening tool of the present embodiment. It is a top view which shows an example. Note that the cross section in FIG. 1 is the AA line in FIG. 3B. Furthermore, FIGS. 4A and 4B are perspective views showing an example of the fastening tool of this embodiment.

A fastening tool 1 of this embodiment includes a tool body 10 and a handle 11 . The fastening tool 1 has a handle 11 extending in another direction crossing the extending direction of the tool body 10 extending in one direction. In the fastening tool 1, the direction in which the tool body 10 extends is the front-rear direction, and the direction in which the handle 11 extends is the vertical direction. The fastening tool 1 also includes a battery attachment portion 13 to which the battery 12 is detachably attached at the lower portion of the handle 11 .

The fastening tool 1 includes a bit holding portion 3 that holds a driver bit 2 rotatably and movably in the longitudinal direction along the axial direction, and a first bit holding portion 3 that rotates the driver bit 2 held by the bit holding portion 3. A drive unit 4 and a second drive unit 5 for moving the driver bit 2 held by the bit holding unit 3 in the longitudinal direction along the axial direction are provided.

Further, the fastening tool 1 includes a screw storage portion 6 in which the screw 200 is stored, a screw feeding portion 7 that feeds the screw stored in the screw storage portion 6, and the fastening tool 1, which is pressed against the fastening object to which the screw is fastened, and the screw. has a nose portion 8 from which is injected.

The bit holding part 3 includes a holding member 30 that detachably holds the driver bit 2 , a rotatable member 30 that supports the holding member 30 so as to be movable in the longitudinal direction along the axial direction of the driver bit 2 , and a rotation that rotates together with the holding member 30 . A guide member 31, a moving member 32 for moving the holding member 30 in the front-rear direction along the guide member 31, and a biasing member 33 for biasing the moving member 32 in the rearward direction are provided.

The holding member 30 has an outer diameter slightly smaller than the inner diameter of the rotation guide member 31 and is configured by, for example, a cylindrical 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 insertion portion 20 of the driver bit 2 at the front end along the axial direction. The holding member 30 has a mechanism for detachably holding the insertion portion 20 of the driver bit 2 by a known mechanism in the opening 30a. The opening 30a of the holding member 30 is exposed inside the rotation guide member 31, and the insertion portion 20 of the driver bit 2 is detachably inserted into the opening 30a.

The rotation guide member 31 extends along the extension direction of the tool body 10 and has a cylindrical shape in which the holding member 30 is accommodated. It is rotatably supported by a metal front frame 10b provided on the front through a bearing 34a. Further, the rotation guide member 31 is connected to the first driving section 4 at the rear end.

The rotation guide member 31 has grooves 31a extending in the front-rear direction along the axial direction of the driver bit 2 at two diametrically opposed side portions. The rotation guide member 31 penetrates the holding member 30 in the radial direction and is connected to the holding member 30 via the connecting member 30b by inserting the connecting member 30b protruding from both sides of the holding member 30 into the groove 31a.

Accordingly, 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 . The connecting member 30 b of the holding member 30 is guided by the groove 31 a of the rotation guide member 31 and moves in the longitudinal direction along the axial direction of the driver bit 2 .

The moving member 32 is an example of a transmission member. 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 rotation guide member 31, and a bearing 32b. A second moving member 32c that is supported by the member 32a and presses the first moving member 32a with a bearing 32b, and a cushioning member 32d attached to the rear side of the second moving member 32c.

The first moving member 32a has an inner diameter slightly larger than the outer diameter of the rotation guide member 31, and is composed of, for example, a cylindrical member that can be placed outside the rotation guide member 31. As shown in FIG. The first moving member 32 a is connected to the holding member 30 via a connecting member 30 b projecting from the groove 31 a of the rotation guide member 31 .

The bearing 32b is inserted between the outer circumference of the first moving member 32a and the inner circumference of the second moving member 32c, and rotatably supports the first moving member 32a with respect to the second moving member 32c.

The second moving member 32c is connected to the first moving member 32a via a bearing 32b in a state in which movement in the longitudinal direction along the axial direction is restricted.

As a result, the first moving member 32a is pushed by the second moving member 32c via the bearing 32b by the movement of the second moving member 32c in the longitudinal direction along the axial direction, and the second moving member 32a moves. It moves in the longitudinal direction along the axial direction together with the member 32c. Also, the first moving member 32a is rotatable with respect to the second moving member 32c.

The urging member 33 is composed of a coil spring in this example, and is provided between the front frame 10b provided on the front side of the case 10a of the tool body 10 outside the rotation guide member 31 and the second moving member 32c of the moving member 32. It abuts on a spring seat which is interposed and arranged so as to contact the end face of the outer ring of the bearing 32b. The biasing member 33 is compressed by the forward movement of the moving member 32 and applies a force to the moving member 32 to push the moving member 32 backward.

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 rotating motor 40 is an example of the first motor, and the shaft 40 a of the bit rotating motor 40 is connected to the speed reducer 41 , and the shaft 41 a of the speed reducer 41 is connected to the rotation guide member 31 . The first drive unit 4 has a configuration in which the speed reducer 41 uses a planetary gear, and the bit rotation motor 40 is arranged coaxially with the driver bit 2 held by the rotation guide member 31 and the holding member 30 .

The first drive unit 4 has a bit rotating motor 40 and a speed reducer 41 attached to a metal rear frame 10c provided on the rear side of the case 10a of the tool body 10. A shaft 41a of the speed reducer 41 is supported by the rear frame 10c via the .

The bit holding part 3 and the first driving part 4 are integrally assembled into a unit by connecting the front frame 10b and the rear frame 10c with a coupling member 10d extending in the front-rear direction. It is fixed to the case 10a by screws 10e. The bit holding part 3 and the first driving part 4 are configured to be detachable from the tool body 10 in a state in which each part is assembled, and are not configured to be independently fixed to the tool body 10, but are easy to assemble. improves.

The bit holding portion 3 has a front end portion of the rotation guide member 31 supported by a front frame 10b provided on the front side of the case 10a of the tool body 10 via a bearing 34a. The end portion is supported by the rear frame 10c provided on the rear side of the case 10a via the shaft 41a of the speed reducer 41 and the bearing 42. As shown in FIG. Therefore, the bit holding portion 3 is rotatably supported by the tool body 10 with the rotation guide member 31 .

Thereby, the first drive unit 4 rotates the rotation guide member 31 by the bit rotation motor 40 . When the rotation guide member 31 rotates, the holding member 30 holding the driver bit 2 rotates together with the rotation guide member 31 because the connecting member 30b is pushed by the groove 31a of the rotation guide member 31 .

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

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

Thereby, the second drive unit 5 rotates the pulley 52 by the bit moving motor 50 to wind the wire 54, thereby moving the second moving member 32c forward. In the bit holding part 3, the forward movement of the second moving member 32c pushes the first moving member 32a via the bearing 32b, and the first moving member 32a moves forward together with the second moving member 32c. Move forward along the axial direction. As the first moving member 32a moves forward, the holding member 30 connected to the first moving member 32a via the connecting member 30b moves forward.

The second drive unit 5 is offset to one side with respect to the approximate center of the fastening tool 1 in the left-right direction so that the tangential direction of the portion of the pulley 52 around which the wire 54 is wound is aligned with the extension direction of the rotation guide member 31 . placed. As a result, the wire W between the pulley 52 and the second moving member 32c extends linearly along the moving direction of the moving member 32, increasing the load when the wire 54 is wound by the pulley 52, An increase in load when the wire W is pulled out from 52 is suppressed.

The first drive unit 4 is provided on one side of the tool body 10, ie, rear, with the handle 11 interposed therebetween. Also, the second drive unit 5 is provided on the other side of the tool main body 10 , which is the front side, with the handle 11 interposed therebetween.

A plurality of screws 200 are connected by a connecting band, and the screw accommodating portion 6 accommodates a spirally wound connecting screw.

FIG. 5 is a perspective view showing the details of the screw feeder of this embodiment. The screw feeding portion 7 includes a screw feeding motor 70, a pinion gear 71 attached to the shaft of the screw feeding motor 70, a rack gear 72 that meshes with the pinion gear 71, and a connecting screw that is connected to the rack gear 72 and fed from the screw accommodating portion 6. It has an engaging portion 73 that engages with. The screw feeding portion 7 includes a pinion gear 71 and a rack gear 72 to constitute a screw feeding transmission portion for transmitting the driving force of the screw feeding motor 70 to the engaging portion 73 . The engaging portion 73 is urged upward by a compression spring (not shown) via a component forming the rack gear 72 . is configured so that it does not fall under its weight.

In the screw feeder 7, a screw feed motor 70 is fixed to a sub-frame 74, and a rack gear 72 is supported by the sub-frame 74 so as to be vertically movable along the feed direction of the connecting screw. The screw feeder 7 is integrally assembled into a unit by fitting parts such as pawls into an uneven shape, fastening screws 75, or the like.

6A and 6B are perspective views showing an example of the nose portion of the present embodiment. The nose portion 8 is an example of a first nose portion, and communicates with the injection passage 80 with an injection passage forming portion 80a which forms an injection passage 80 through which the screw 200 is fed by the screw feeding portion 7 and the driver bit 2 passes. A contact member 81 having an ejection port 81a and coming into contact with an object to be fastened, a contact arm 82 moving forward and backward in conjunction with the contact member 81, and an adjusting portion 83 for regulating the amount of movement of the contact arm 82 are provided. Further, the nose portion 8 includes a cover member 88 that openably and closably covers the path through which the screw 200 passes from the screw housing portion 6 to the injection passage 80 .

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

The nose portion 8 supports the contact member 81 so as to be movable in the front-rear direction, and the contact arm 82 moves in the front-rear direction in conjunction with the contact member 81 . In the nose portion 8, the contact member 81 is urged forward by an urging member (not shown), and the contact member 81 moved backward by being pressed against the object to be fastened is urged by the urging member to move forward. do.

The adjusting portion 83 adjusts the amount of movement of the contact arm 82 of the nose portion 8 until the contact member 81 is pressed against the object to be fastened and the contact arm 82 moves rearward and the contact switch portion 84 is actuated. The contact switch portion 84 is switched between the presence and absence of operation by being pushed by the contact arm 82 . The state in which the contact switch portion 84 is actuated by being pushed by the contact arm 82 is referred to as the ON state of the contact switch portion 84 .

The nose portion 8 is assembled into an integral sub-frame 86 by fitting the parts constituting the injection passage 80, the contact member 81, and the contact arm 82 with projections and recesses, fastening screws 85, etc., and forming a unit. It is fixed by a screw 87 to the front frame 10 b that constitutes the main body 10 . When the nose portion 8 is fixed to the front frame 10b, the injection passage 80 is formed by the injection passage forming portion 80b of the nose body portion 10f fixed to the tool main body 10 side and the injection passage forming portion 80a which is a component on the nose portion 8 side. is configured.

A sub-frame 86 having the function of fixing the nose portion 8 to the tool body 10 is formed with an injection passage forming portion 80a that constitutes a part of the injection passage 80, and positions the injection passage 80 with respect to the tool body 10. It also has the function of As a result, when the nose portion 8 is fixed to the front frame 10b, the injection passage forming portion 80a is correctly aligned, and even if the nose portion 8 is detachable from the tool main body 10, the injection passage 80 is positioned to the driver bit 2. Displacement in the radial direction, in particular, with respect to the movement path is suppressed. Further, the contact switch portion 84 is attached to the tool body 10 side, and when the nose portion 8 is fixed to the front frame 10b, the contact switch portion 84 and the contact switch portion 84 are positioned at the side of the contact arm 82 facing the contact switch portion 84. Fit.

The screw feeder 7 is configured integrally with the front frame 10b or fixed to the front frame 10, so that the sub-frame 74 is fixed to the nose main body 10f constituting the tool main body 10 by screws 76. be.

The fastening tool 1 includes a trigger 9 that receives an operation and a trigger switch section 90 that operates when the trigger 9 is operated. The trigger 9 is provided on the front side of the handle 11 and configured to be operated with a finger that grips the handle 11 . The trigger switch section 90 is actuated by being pushed by the trigger 9 .

The trigger switch part 90 is switched between the presence and absence of operation by being pushed by the trigger 9. In this example, the trigger switch part 90 is not operated because the trigger 9 is not operated and the trigger switch part 90 is not pushed by the trigger 9. The trigger switch portion 90 is turned off when the trigger switch 90 is pressed, and the trigger switch portion 90 is turned on when the trigger 9 is pressed by the trigger 9 and the trigger switch portion 90 is activated.

The fastening tool 1 operates the first drive section 4, the second drive section 5 and the screw based on the output of the trigger switch section 90 which is operated by the operation of the trigger 9 and the contact switch section 84 which is operated by being pushed by the contact member 81. A control unit 100 for controlling the feeding unit 7 is provided. In this example, the control unit 100 is installed inside the battery mounting unit 13 provided below the handle 11 .

<Example of operation of the fastening tool according to the present embodiment>
FIG. 7 is a side sectional view showing an example of the operation of the fastening tool of the present embodiment, and FIGS. 8A and 8B are partially broken perspective views showing an example of the operation of the fastening tool of the present embodiment. Next, the fastening operation of the fastening tool of the present embodiment will be described with reference to each drawing.

In the standby state of the fastening tool 1, the tip of the driver bit 2 is positioned at the standby position P1 behind the injection passage 80, as shown in FIG.

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 to turn on the contact switch portion 84, and the trigger 9 is operated to turn on the trigger switch portion 90. , the bit moving motor 50 of the second driving section 5 is driven, and the bit rotating motor 40 of the first driving section 4 is driven at a predetermined timing.

When the bit moving motor 50 is driven and rotates in one direction, the pulley 52 rotates in the forward direction, so that 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 rotation guide member 31 and moves forward in 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 compresses the biasing member 33 together with the second moving member 32c. while moving forward along the axial direction.

When the first moving member 32a moves forward, the holding member 30, which is connected to the first moving member 32a by the connecting member 30b, is guided by the groove 31a of the rotation guide member 31 and the driver bit. 2 moves forward along the axial direction.

As a result, the driver bit 2 held by the holding member 30 moves forward, engages with the screw 200 supplied to the ejection port 80 of the nose portion 8, and moves the screw 200 forward, thereby moving the fastening object. press against.

When the bit rotation motor 40 is driven to rotate in one direction, that is, the positive 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 30 b connected to the holding member 30 is pressed against the groove 31 a of the rotation guide member 31 , so that the holding member 30 rotates together with the rotation guide member 31 .

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 rotates the driver bit 2 by the first driving unit 4 to drive the screw into the object to be fastened. Based on the load applied to the motor 50, the number of rotations of the bit moving motor 50, etc., the driver bit 2 is moved forward by the first driving unit 5, so that the driver bit 2 follows the screw screwed into the object to be fastened. .

As shown in FIG. 7, when the tip of the driver bit 2 protrudes from the ejection port 81a of the contact member 81 and reaches a predetermined operation end position P2, the control unit 100 stops driving the bit rotation motor 40, The bit moving motor 50 is reversed. The control unit 100 may determine that the tip of the driver bit 2 has reached the operation end position P2 based on the number of rotations of the bit moving motor 50. The operation end position P2 may be variable based on the number, the load applied to the bit moving motor 50, the rotation speed of the bit moving motor 50, and the like.

When the bit movement motor 50 rotates in the opposite direction, the wire 54 is pulled out of the pulley 52 by rotating the pulley 52 in the opposite direction. When the wire 54 is pulled out from the pulley 52, the second moving member 32c moves forward, thereby extending the compressed biasing member 33 and pushing the second moving member 32c backward.

The second moving member 32c is pushed rearward by the biasing member 33 and is guided by the rotation 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 axially moves rearward along with the second moving member 32c. Moving.

When the first moving member 32a moves backward, the holding member 30, which is connected to the first moving member 32a by the connecting member 30b, is guided by the groove 31a of the rotation guide member 31 and the driver bit. 2 in the backward direction along the axial direction.

As a result, the driver bit 2 held by the holding member 30 moves backward, and the tip of the driver bit 2 returns to the standby position P1. The moving member 32 is provided with a cushioning member 32d made of rubber or the like on the rear side of the second moving member 32c. Direct contact with the rear frame 10c is suppressed, and noise generation and damage can be suppressed. When the second moving member 32c is pushed backward 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 bit moving motor 50 from rotating. When the trigger switch section 90 is turned off, the control section 100 rotates the screw feed motor 70 in one direction, thereby lowering the engaging section 73 . When the engaging portion 73 descends to the position where it engages with the next screw 200 , the control portion 100 reverses the screw feed motor 70 to raise the engaging portion 73 and move the next screw 200 into the supply passage 80 . supply.

In the fastening tool 1, a battery 12 is detachably attached to a battery attachment portion 13 provided on a handle 11, and a driver bit 2 is rotated by a bit rotation motor 40 driven by electricity supplied from the battery 12. The driving unit 4 and the second driving unit 5 that move the driver bit 2 in the longitudinal direction along the axial direction by the bit moving motor 50 driven by the electricity supplied from the battery 12 are provided. As a result, there is no need to connect a hose, unlike a pneumatically driven fastening tool, and workability is improved.

In addition, the fastening tool 1 is provided with the second drive unit 5 that moves the driver bit 2 in the longitudinal direction along the axial direction. The screw can be fastened without moving in a direction approaching the fastening target. As a result, there is no need to move the tool body in a direction to approach the object to be fastened, unlike a normal drill driver or impact driver, thereby improving workability.

Furthermore, since the second drive unit 5 presses the screw engaged with the driver bit 2 against the object to be fastened by the driving force of the bit moving motor 50, the excess or deficiency of the force pressing the screw against the object to be fastened can be adjusted. It can be done easily and the screw can be pressed against the object to be fastened with proper force.

The first drive unit 4 is provided on one side of the tool body 10 with the handle 11 interposed therebetween, and the second drive unit 5 is provided on the other side of the tool body 10 with the handle 11 interposed therebetween. It is provided at the front, which is the side. As a result, the first drive section 4 and the second drive section 5 each having a motor and having a relatively heavy weight are dispersedly arranged in front and behind the handle 11 . Therefore, when the handle 11 is held by hand and the tool body 10 is extended in a substantially horizontal direction, the weight balance between the front and rear sides of the handle 11 becomes substantially uniform, improving workability.

Further, the second drive unit 5 is offset to the left side, which is one side of the substantially center of the fastening tool 1 in the left-right direction. It is arranged offset to the right, which is the other side, with respect to the approximate center in the direction. As a result, the left and right weight balance becomes substantially even, and workability is improved.

In the fastening tool 1, as described above, the first driving section 4 that rotates the driver bit 2 and the second driving section 5 that moves the driver bit 2 in the longitudinal direction along the axial direction are driven by independent motors. be done. As a result, compared to a configuration in which a single drive source performs two operations, a driving force transmission mechanism, a mechanism for transmitting driving force at a predetermined timing, etc., are unnecessary, and the configuration is improved. It can be simplified. Moreover, the weight can be reduced by simplifying the configuration. Further, the interlocking of the two actions can be controlled.

Further, the screw feeder 7 can also be driven by electricity supplied from the battery 12 by using the screw feed motor 70 as a driving source, and air pressure supply is unnecessary. Furthermore, the screw feeder 7 is driven by a motor independent of the rotation and movement of the driver bit 2, which simplifies the configuration compared to a configuration in which two or three operations are performed by a single drive source. can. In addition, interlocking of a plurality of operations can be performed by control.

The screw feeder 7 is configured to be detachable from the nose main body 10f that constitutes the tool main body 10 in a state in which each component is unitized and assembled. As a result, each part such as the screw feed motor 70 is not fixed to the tool main body 10 independently, but the assembly is improved, and maintenance and replacement at the time of inspection can be easily performed. In addition, compared to a configuration in which each part is independently fixed to the tool body 10, accuracy between each part can be improved. Furthermore, since the nose body portion 10f to which the screw feeding portion 7 is fixed is integrated with or fixed to the front frame 10b constituting the tool body 10, the mounting position accuracy of the screw feeding portion 7 with respect to the tool body 10 is improved. can be improved. Further, since the nose body portion 10f constitutes a part of the injection passage 80 through which the driver bit 2 passes, it is possible to improve the accuracy of the mounting position of the screw feeding portion 7 with respect to the injection passage 80. As shown in FIG.

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

In the fastening tool 1, as shown in FIG. 1, the tip of the driver bit 2 positioned at the standby position P1 is positioned deep in the nose portion 8 and is not exposed to the injection opening 81a of the contact member 81. As shown in FIG. Therefore, when replacing the driver bit 2, the nose part 8 is attached and detached.

For attachment and detachment of the nose portion 8, the screw 87 is first removed. By removing the screw 87, the nose portion 8 can be removed from the fastening tool 1, as shown in FIG. 9B. The nose portion 8 is configured to be attachable to and detachable from the tool body 10 in a state in which each component is assembled. get off. When the nose portion 8 is removed from the front frame 10b that constitutes the tool body 10, the injection passage configuration portion 80b of the nose body portion 10f that is fixed to the tool body 10 side is removed from the injection passage configuration portion 80b that is the part on the nose portion side 8 side. The portion 80a is removed and the injection passage 80 is exposed.

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

The driver bit 2 is held by the holding member 30 by inserting the driver bit 2 through the opening of the rotation guide member 31 and pushing it into the opening 30 a of the holding member 30 . The nose portion 8 is fixed to the tool body 10 by attaching the nose portion 8 to the front end portion of the tool body 10 and tightening the screw 87 .

From the relationship of the speed reduction ratio of the speed reducer 51 of the second drive unit 5, if the pulley 52 does not rotate even if an external force is applied to the pulley 52 while the bit moving motor 50 is stopped, the driver A bit replacement mode may be provided in which the rotation of the bit moving motor 50 is stopped while the moving member 33 is moved to the replacement position where the tip of the bit 2 protrudes from the rotation guide member 31 by a predetermined amount.

The nose portion 8 is detachably attached to the tool main body 10 in a state in which the respective parts constituting the injection passage 80, the contact member 81 and the contact arm 82 are unitized and assembled. As a result, it is possible to improve the ease of assembly, instead of fixing each component such as the contact arm 82 to the tool body 10 independently. In addition, compared to a configuration in which each part is independently fixed to the tool body 10, accuracy between each part can be improved. Furthermore, since the contact switch portion 84 requiring wiring is attached to the tool body 10 side, it is not necessary to connect or disconnect the wiring.

<Modified example of the fastening tool according to the present embodiment>
FIG. 10A is a side cross-sectional view showing a modification of the fastening tool of this embodiment, FIG. 10B is a side cross-sectional view showing another modification of the fastening tool of this embodiment, and FIG. is a block diagram showing a modification of the fastening tool.

As described above, the fastening tool 1 includes the second driving section 5 that moves the driver bit 2 in the longitudinal direction along the axial direction. The second driving section 5 is driven by the bit moving motor 50 to move the bit. A moving member 32 connected by a wire 54 to a pulley 52 driven and rotated by a motor 50, and a holding member 30 connected to the moving member 32 are moved along the rotation guide member 31 along the axial direction of the driver bit 2. It is configured to move forward. Thus, by controlling the amount of rotation of the bit moving motor 50, the moving amount (advance amount) of the driver bit 2 can be controlled. That is, by rotating the bit moving motor 50 in conjunction with the rotation of the bit rotating motor 40 that rotates the driver bit 2 in the direction of tightening the screw 200, the screw 200 is tightened and moved forward following the screw 200. The stop position of the driver bit 2 along the axial direction can be controlled by controlling the amount of advance of the driver bit 2 by controlling the amount of rotation of the bit moving motor 50 .

12A to 12C are cross-sectional views showing the fastening state of the screw. FIG. 12A is a so-called flush state in which the head 201 of the screw 200 is neither raised nor embedded in the surface of the fastening target 202, and FIG. 12C shows a state in which the head 201 of the screw 200 is floating from the object 202 to be fastened, and FIG.

In the fastening tool 1, when the tip of the driver bit 2 reaches the operation end position P2, if the screw 200 is a countersunk screw, the surface of the head portion 201 of the screw 200 is aligned with the fastening object 202 as shown in FIG. 12A. It is preferable that the advance amount of the driver bit 2 is set so as to be in a so-called flush state that is the same as the surface of the driver bit 2 . Note that the screw 200 is not limited to a countersunk screw, and if it is a pan head screw, a bind screw, a truss screw, or the like, the bearing surface of the head 201 of the screw 200 is in contact with the surface of the object 202 to be fastened, and the head 201 of the screw 200 is fastened. It is preferable that the advance amount of the driver bit 2 is set so as not to be in a state of floating from the object 201 .

When the tip of the driver bit 2 reaches the operation end position P2, if the head 201 of the screw 200 is in a state of floating from the fastening object 202 as shown in FIG. to advance the operation end position P2. On the other hand, when the head 201 of the screw 200 is buried in the fastening object 202 as shown in FIG. 12C, the advance amount of the driver bit 2 should be reduced to retract the operation end position P2.

Therefore, a setting unit 110 for setting the advance amount of the driver bit 2 is provided. The setting unit 110 is an example of setting means, and is configured so that a plurality of setting values can be selected or arbitrary setting values can be selected steplessly. For example, as shown in FIG. 10A, the setting unit 110 has a configuration in which setting values are selected with a rotary dial.

Of the methods of providing dedicated setting means for setting the movement amount (advance amount) of the driver bit 2, in the above-described configuration having the rotary dial, the dial serves as a means for converting the operator's operation into an electric signal. A method using a potentiometer whose resistance value changes according to the rotation angle of the connected shaft, or a rotary encoder that outputs a pulse according to the rotation angle can be considered. The control unit 100 reads these voltage values and pulse numbers, and sets the number of rotations (rotation amount) of the bit moving motor 50 that determines the movement amount (advance amount) of the driver bit 2 .

When both the contact switch portion 84 that is pushed by the contact arm 82 and the trigger switch portion 90 that is operated by the operation of the trigger 9 are turned on and the conditions for starting screw tightening are satisfied, the screwdriver bit 2 is in the initial position, i.e., waits. After rotating the bit moving motor 50 by a set rotation amount with the position P1 as a starting point, the operation end position P2 is controlled and the tightening depth can be adjusted by stopping the rotation or rotating it in reverse.

Moreover, as shown in FIG. 10B, the setting unit 110 may be configured to select a setting value with a button. In the method using a switch such as a button that is operated by pressing, a plurality of, for example, two tactile switches (momentary switches) are used. can be considered. In the case of this method, once the power to the tool body is turned off, the previous set values will not be known when the power is turned on next time.

The setting unit 110 may be a lever type switch or a touch panel. Also, the setting unit 110 may be a combination of a plurality of setting units, for example, a combination of the above-described dial method and switch method. In this case, the amount of tightening may be adjusted by operating a dial, and the amount of tightening may be set deeper by operating a switch when oblique hitting such as temporary corner hitting is required.

Furthermore, the setting unit 110 sets the selected setting value by a method of indicating the current value with a label, a stamp, or the like, or a method of indicating the current value with an LED or the like, so that the operator can easily grasp the current setting value. You may provide the structure which displays. In order to prevent erroneous determination of setting due to noise or the like, the setting signal may be detected only when the bit moving motor 50 is stopped. In addition, since a potentiometer may indicate an abnormal voltage outside the normal operating range due to a failure, it is also possible to not use an abnormal value or notify the operator of the failure by means of an LED or buzzer. be done.

In a configuration that adjusts the advance amount of the driver bit 2 by a mechanical configuration such as moving the position of the stopper, a setting portion that moves the position of the stopper may be provided near the nose portion 8 . In contrast, in the fastening tool 1 of the present embodiment, by controlling the amount of rotation of the bit moving motor 50, the moving amount (advance amount) of the driver bit 2 can be electrically controlled. Therefore, there are few restrictions on the position where the setting unit 110 is provided. Therefore, in the example of FIGS. 10A and 10B, the setting portion 110 is provided on one side portion of the battery mounting portion 13 provided on the lower portion of the handle 11 . When the handle 11 is held with the right hand, the setting part 110 is operated with the left hand.

FIG. 13 is a plan view showing an example of a setting unit; The setting unit 110 shown in FIG. 13 is provided in the fastening tool 1 shown in FIG. 10B. A button 110b is provided to select a set value for incrementally increasing amounts.

The setting unit 110 also includes a guide diagram 110a1 to visually recognize the setting value selected by operating the button 110a. The guide diagram 110a1 may be provided on the button 110a or may be provided near the button 110a. Similarly, the setting unit 110 includes a guide diagram 110b1 to visually recognize the setting value selected by operating the button 110b. The guide diagram 110b1 may be provided on the button 110b or may be provided near the button 110b.

Furthermore, the setting unit 110 includes a lamp 110c that displays the selected setting value. The lamp 110c is an example of a display unit, and displays a selected set value according to the number of lighting of the plurality of lamps 110c. For example, when the advance amount of the driver bit 2 is decreased, the number of lit lamps 110c is decreased, and when the advance amount of the driver bit 2 is increased, the number of lit lamps 110c is increased. Also, the color of the lamp 110c may be changed according to the set value.

In order to set the movement amount (advance amount) of the driver bit 2, the contact switch section 84 or the trigger switch section 90 may be used as setting means other than the method of providing a dedicated setting means. In the method using existing operating means such as the contact switch unit 84 and the trigger switch unit 90 as setting means, the contact arm 82 and the trigger 9 can be set by performing a predetermined setting operation that is different from the operation for executing a normal fastening operation. , the number of rotations (amount of rotation) of the bit moving motor 50 can be set. For example, if the trigger 9 is pulled and released continuously for a predetermined number of times without actuating the contact arm 82, it is determined that the number of rotations (amount of rotation) of the bit moving motor 50 is set. . Specifically, it is conceivable to adjust the tightening depth step by step each time a predetermined operation such as quickly operating only the trigger 9 three times is repeated.

In the method using existing operating means such as the contact switch part 84 and the trigger switch part 90 as setting means, there is no need for separate operating means or setting means for adjusting the amount of tightening, so the tool body can be made smaller, Cost can be reduced.

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

The control unit 100 sets the amount of rotation of the bit moving motor 50 that defines the advance amount of the driver bit 2 based on the setting value selected by the setting unit 110 in step SA1 of FIG. In the control unit 100, the contact member 81 is pressed against the object to be fastened, the contact switch unit 84 is pushed by the contact arm 82, the contact switch unit 84 is turned on at step SA2, the trigger 9 is operated, and the control unit 100 is turned on at step SA3. When the trigger switch section 90 is turned on, the bit moving motor 50 of the second driving section 5 is driven at step SA4, and the bit rotating motor 40 of the first driving section 4 is driven at step SA5.

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

As a result, the driver bit 2 held by the holding member 30 moves forward, engages with the screw 200 supplied to the ejection port 80 of the nose portion 8, and moves the screw 200 forward, thereby moving the fastening object. press against.

Further, when the bit rotation motor 40 is driven to rotate in one direction, that is, the forward direction, the holding member 30 rotates together with the rotation guide member 31 .

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 rotates the driver bit 2 by the first driving unit 4 to drive the screw into the object to be fastened. Based on the load applied to the motor 50, the number of rotations of the bit moving motor 50, etc., the driver bit 2 is moved forward by the first driving unit 5, so that the driver bit 2 follows the screw screwed into the object to be fastened. .

When the amount of rotation of the bit moving motor 50 reaches the set value selected by the setting unit 110 in step SA6 and the tip of the driver bit 2 reaches the set operation end position P2, the control unit 100 rotates the bit in step SA7. The driving of the motor 40 is stopped, and the bit moving motor 50 is reversed at step SA8.

When the bit moving motor 50 rotates in the opposite direction, the wire 54 is pulled out from the pulley 52, so that the biasing member 33 pushes the moving member 32 rearward. The connected holding member 30 moves rearward in the axial direction of the driver bit 2 along the rotation guide member 31 .

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

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

In the fastening tool 1 , by controlling the amount of rotation of the bit moving motor 50 , the moving amount (advance amount) of the driver bit 2 can be controlled. As a result, the position of the tip of the driver bit 2 can be adjusted with high accuracy with a simple structure, compared to a structure that allows adjustment of the advance amount of the driver bit 2 with a mechanical structure such as moving the position of the stopper. It is possible. Therefore, as shown in FIG. 12B, the head 201 of the screw 200 is prevented from floating from the fastening object 202, or from sinking too much into the fastening object 202 as shown in FIG. , a so-called flush state can be obtained, and the finish after the fastening work is beautiful.

15A to 15D are perspective views showing modifications of the installation position of the setting section. As described above, in the fastening tool 1 of the present embodiment, by controlling the amount of rotation of the bit moving motor 50, the moving amount (advancing amount) of the driver bit 2 can be electrically controlled. There are few restrictions on the installation position.

Therefore, in FIG. 15A , the setting portion 110 is provided above the battery mounting portion 13 provided below the handle 11 . Moreover, in FIG. 15B , the setting portion 110 is provided at the rear portion of the battery mounting portion 13 . By providing the setting portion 110 near the center in the left-right direction on the upper portion or rear portion of the battery mounting portion 13 , the setting portion 110 can be operated regardless of the dominant hand holding the handle 11 .

Furthermore, the setting portion 110 may be provided on the tool body 10 side, and in FIG. 15C the setting portion 110 is provided on the side portion of the tool body 10 . When the handle 11 is held with the right hand, the setting section 110 is operated with the left hand.

15D, the setting portion 110 is provided in the rear portion of the tool body 10, in this example, in the rear portion of the cover portion 43 that covers the first driving portion 4. As shown in FIG. By providing the setting part 110 near the center in the left-right direction at the rear part of the tool main body 10 , the setting part 110 can be operated regardless of the dominant hand holding the handle 11 . Note that the setting portion 110 may be provided on the upper portion of the tool body 10 .

In this way, since the amount of movement of the driver bit 2 along the axial direction can be set by an electric signal, there are few restrictions on the arrangement of the setting unit 110, and the optimum setting is possible in consideration of the operability of tightening depth adjustment. easy to convert.

Reference Signs List 1 Fastening tool 10 Tool body 10a Case 10b Front frame 10c Rear frame 10d Coupling member 10e Screw 10f Nose main body 11 Handle 12 Battery 13 Battery mounting portion 2 Driver bit 3 Bit holding portion 30 Holding member 30a Opening 30b Connecting member 31 Rotation guide member 31a Groove 32 Moving member (transmitting member) 32a First moving member 32b Bearing , 32c . ... reducer, 41a ... shaft, 42 ... bearing, 5 ... second drive section, 50 ... bit moving motor (motor, second motor), 50a ... shaft, 51... Reducer, 51a... Shaft, 52... Pulley (transmission member), 53... Bearing, 54... Wire (transmission member), 6... Screw housing, 7... Screw feeder 70 Screw feed motor 71 Pinion gear (screw feed transmission unit) 72 Rack gear (screw feed transmission unit) 73 Engagement unit 74 Subframe 75, 76 Screw 8 Nose 80 Ejection passage 80a, 80b Ejection passage forming part 81 Contact member 81a Ejection port 82 Contact arm 83 Adjusting unit 84 Contact switch unit 85 Screw 86 Subframe 87 Screw 88 Cover member 9. Trigger 90 Trigger switch section 100 Control section 110 Setting section

Claims (5)

a bit holding part having a holding member that holds a driver bit rotatably and axially movably;
a first driving section having a first motor for rotating the driver bit held by the holding member in the bit holding section;
a second drive unit having a second motor for axially moving the driver bit;
A fastening tool comprising: a controller that controls the amount of movement of the driver bit along the axial direction by the amount of rotation of the second motor. The fastening tool according to claim 1, wherein the control unit controls the amount of axial movement of the driver bit that advances as the screw is fastened, using the amount of rotation of the second motor. A setting unit for setting the amount of movement of the driver bit along the axial direction,
3. The control unit according to claim 1, wherein the control unit controls the amount of rotation of the second motor based on the set value of the amount of movement of the driver bit along the axial direction set by the setting unit. fastening tool. The control unit rotates the second motor that moves the driver bit along the axial direction in conjunction with the rotation of the first motor that rotates the driver bit in a screw tightening direction,
The fastening tool according to any one of claims 1 to 3, wherein when the second motor is stopped based on the setting value set by the setting section, the first motor is stopped. The fastening tool according to any one of claims 1 to 4, wherein the setting section includes a display section for displaying set values.

Images