Fastening tools

Abstract

[Problem] Provide a fastening tool that is designed to allow easy control of the amount of movement of the screwdriver head toward the tightening screw. [Solution] The fastening tool 1 includes: a holding member 30, which detachably mounts the screwdriver head 2, moves axially along the extension direction of the rotary guide member 31 inside the rotary guide member 31, and rotates together with the rotary guide member 31; a first moving member 32a, which is connected to the holding member 30 via a connecting member 30b, rotates together with the holding member 30 and the rotary guide member 31, and moves axially along the rotary guide member 31; a second moving member 32c, which supports the first moving member 32a to be rotatable, and moves axially along the rotary guide member 31; a pulley 52, which is driven to rotate by a screwdriver head moving motor 50; and a wire 54, which connects the pulley 52 and the second moving member 32c; the wire 54 extends in a direction parallel to the extension direction of the rotary guide member 31.

Description

[Technical Field]

[0001] The present invention relates to a fastening tool, which involves engaging a screwdriver head with a screw, pushing the screw with the screwdriver head and pressing it against the object to be fastened, and then rotating the screwdriver head to twist it in. [Previous Technology]

[0002] A tool called a portable driver is known, which uses the pressure of compressed air supplied from an air compressor or the combustion pressure of gas to sequentially drive out connecting fasteners loaded in a nail box from the head end of a drive guide member.

[0003] In the tool that rotates the screwdriver head and tightens the screw, and moves the screwdriver head in the direction of tightening the screw, a pneumatic screwdriver has been proposed in the past (for example, see Patent Document 1), which rotates the head by means of a pneumatic motor and moves the screw in the direction of tightening by means of air pressure.

[0004] Tools that utilize air pressure do not have motors or the like, so they do not require a substrate for assembling electronic components, such as control circuits. On the other hand, they require a connection to an air pressure hose for use, which reduces their workability.

[0005] In contrast, a screw-driving machine is proposed (for example, see Patent Document 2), which uses the driving force of a motor that rotates the screw to compress a spring, and then uses the bias of the spring to drive the screw in. [Prior Patent Document] [Patent Document]

[0006] [Patent Document 1] Japanese Patent No. 5262461 [Patent Document 2] Japanese Patent No. 6197547 [Summary of the Invention]

[0007] [The problem the invention aims to solve]

[0008] Both screw-driving machines that use air pressure and screw-driving machines that use the bias of a spring to drive in screws have difficulty controlling the amount of movement of the screwdriver head in the direction of tightening the screw.

[0009] Furthermore, in an electric screwdriver used by holding a handle, it is proposed that a battery be installed in the lower part of the handle, and a substrate be provided between the handle and the battery. However, with this configuration, the size of the tool along the extension direction of the handle increases.

[0010] The present invention was developed to solve this problem, and its purpose is to provide a fastening tool that is designed to allow easy control of the amount of movement of the screwdriver head toward the direction of the locking screw.

[0011] Furthermore, the present invention aims to provide a fastening tool that suppresses the enlargement of the tool's dimensions along the extension direction of the handle. [Means of Solving the Problem]

[0012] To solve the above problems, the present invention is a fastening tool comprising: a cylindrical rotary guide member extending in one direction and supported by a bearing for rotatability; a retaining member having an opening for detachably inserting a screwdriver bit, moving axially along the extending direction of the rotary guide member inside the rotary guide member and rotating together with the rotary guide member; a moving member for moving the retaining member along the rotary guide member in a front-rear direction; a rotary member driven by a motor to rotate; and a transmission member connected to the moving member and having flexibility to be wound around the outer periphery of the rotary member; the rotary member is rotated by the motor, thereby moving the moving member by the transmission member in one direction where a screw engaging with a screwdriver bit is pressed against the object being fastened.

[0013] In this invention, the screw that engages with the screwdriver bit is pressed against the object to be fastened by controlling the amount of rotation of the motor, and the amount of movement of the screwdriver bit in the direction of tightening the screw is controlled.

[0014] Furthermore, the present invention is a fastening tool, which includes: a tool body extending in one direction; a handle extending in another direction intersecting the extension direction of the tool body; a receiving portion disposed on one side of the handle along the extension direction of the tool body and for receiving consumables; and a substrate receiving portion disposed on the side of the receiving portion opposite to the handle and for receiving the substrate.

[0015] In this invention, a substrate storage portion is provided on the back side of the receiving portion, utilizing the space between the receiving portion and the handle. [Effects of the Invention]

[0016] In this invention, the amount of movement of the screwdriver bit in the direction of the tightening screw can be controlled by controlling the rotation of the motor, and the control of the amount of movement of the screwdriver bit is easy.

[0017] Furthermore, in this invention, by providing a substrate storage portion on the back side of the receiving portion, the size expansion of the fastening tool along the extension direction of the handle can be suppressed.

Implementation Method

[0019] Hereinafter, with reference to the drawings, embodiments of the fastening tool of the present invention will be described. <Example of the configuration of the fastening tool of this embodiment>

[0020] FIG1A is a side sectional view showing an example of the internal structure of the fastening tool of this embodiment; FIG1B is a top sectional view showing an example of the internal structure of the fastening tool of this embodiment; FIG1C is a front sectional view showing an example of the internal structure of the fastening tool of this embodiment. FIG2A is an exploded perspective view showing an example of the internal structure of the fastening tool of this embodiment; FIG2B is an external perspective view showing an example of the fastening tool of this embodiment.

[0021] The fastening tool 1 of this embodiment includes: a screwdriver head holding part 3, which holds the screwdriver head 2 so that it can be rotated and moved in the axial direction; a first driving part 4, which rotates the screwdriver head 2 held by the screwdriver head holding part 3; and a second driving part 5, which moves the screwdriver head 2 held by the screwdriver head holding part 3 in the axial direction.

[0022] Furthermore, the fastening tool 1 includes: a screw storage section 6, which stores the screw 200; a screw feed section 7, which feeds the screw stored in the screw storage section 6; and a nose 8, which is the fastening object that is pressed against the screw 200 and locks in place, and ejects the screw.

[0023] Furthermore, the fastening tool 1 has a tool body 10 and a handle 11. Also, the fastening tool 1 has a battery mounting part 13 at the end of the handle 11, which is used to mount the battery 12 in a detachable manner.

[0024] The fastening tool 1 has a tool body 10 extending along one of the axial directions of the screwdriver bit 2 indicated by arrows A1 and A2, while the handle 11 extends in other directions that intersect the extending direction of the tool body 10. The fastening tool 1 takes the extending direction of the tool body 10, that is, the axial direction of the screwdriver bit 2 indicated by arrows A1 and A2, as the front-back direction. Furthermore, the fastening tool 1 takes the extending direction of the handle 11 as the up-down direction. Moreover, the fastening tool 1 takes the direction orthogonal to the extending direction of the tool body 10 and the extending direction of the handle 11 as the left-right direction.

[0025] The first drive unit 4 is disposed at the rear, across the handle 11, and is located on one side of the tool body 10. The second drive unit 5 is disposed at the front, across the handle 11, and is located on the other side of the tool body 10.

[0026] The screw storage section 6 connects multiple screws 200 via a connecting belt and stores the connecting screws that are wound into a spiral shape.

[0027] Figures 3A and 3B are perspective views showing an example of the main components of the fastening tool according to this embodiment; Figures 4A to 4C are cross-sectional perspective views showing an example of the main components of the fastening tool according to this embodiment; Figure 5 is a top cross-sectional view showing an example of the main components of the fastening tool according to this embodiment, showing details of the screwdriver bit holding part 3 and the first driving part 4. Next, referring to the figures, the screwdriver bit holding part 3 and the first driving part 4 will be described.

[0028] The screwdriver head holding part 3 includes: a holding member 30, which holds the screwdriver head 2 in a detachable manner; a rotation guide member 31, which supports the holding member 30 so that it can move in the front-back direction along the axis of the screwdriver head 2 as indicated by arrows A1 and A2, and rotates together with the holding member 30; a moving member 32, which moves the holding member 30 in the front-back direction along the guide member 31; and a biasing member 33, which biases the moving member 32 in the rear direction as indicated by arrow A2.

[0029] The retaining member 30 has an outer diameter slightly smaller than the inner diameter of the rotary guide member 31, and is constructed of, for example, a cylindrical member that is inserted into the inner side of the rotary guide member 31. The retaining member 30 has an opening 30a at its end facing forward along the axial direction of the screwdriver head 2, the shape of which matches the cross-sectional shape of the screwdriver head 2. The retaining member 30 has a disassembly and assembly retaining mechanism 30c at the opening 30a for removably holding the screwdriver head 2. The retaining member 30 has the opening 30a protruding from the inner side of the rotary guide member 31, and the screwdriver head 2 is removably inserted into the opening 30a.

[0030] The rotary guide member 31 extends along the extension direction of the tool body 10, that is, along the axial direction of the screwdriver head 2 in the front-rear direction indicated by arrows A1 and A2. The rotary guide member 31 is a cylindrical shape in which the retaining member 30 is installed inside. The front end is supported and rotatable in the metal front frame 10b by a bearing 34a, which is an example of a bearing. The front frame 10b is provided on the front side of the resin housing 10a, which constitutes the housing of the tool body 10. Furthermore, the rotary guide member 31 connects the rear end to the first drive unit 4.

[0031] The rotary guide member 31 has grooves 31a formed at two positions on its radially opposite side, which extend in the front-back direction indicated by arrows A1 and A2 along the axial direction of the screwdriver head 2. The rotary guide member 31 is connected to the retaining member 30 via the connecting member 30b, which is inserted into the grooves 31a. The connecting member 30b penetrates the retaining member 30 radially and protrudes from both sides of the retaining member 30.

[0032] The retaining member 30 is provided with a hole through which the rotation direction of the screwdriver head 2 is perpendicular, and the connecting member 30b is inserted into the hole and then fixed with a pin 30f. The connecting member 30b is composed of a cylindrical member with an elliptical cross-section.

[0033] The connecting member 30b is an ellipse whose long side extends along the direction of the groove 31a, which is parallel to the axis of the screwdriver head 2 indicated by arrows A1 and A2. The short side of the ellipse is orthogonal to the direction of extension of the groove 31a, indicated by arrows B1 and B2, that is, along the rotation direction of the rotation guide member 31. Furthermore, the width of the short side of the connecting member 30b along the rotation direction of the rotation guide member 31 is slightly smaller than the width of the groove 31a along that direction.

[0034] Accordingly, the connecting member 30b inserted in the groove 31a is supported by the groove 31a and is movable along the axial direction of the rotary guide member 31. Furthermore, the movement of the rotary guide member 31 along the rotational direction is restricted between one side and the other side of the groove 31a along its extension direction. Therefore, the connecting member 30b, by means of the rotation of the rotary guide member 31, is pushed by one side or the other side of the groove 31a in response to the rotational direction of the rotary guide member 31, and thus bears a circumferential force from the rotary guide member 31 in the rotational direction.

[0035] Therefore, when the retaining member 30 rotates, it is pushed by the groove 31a of the rotating guide member 31 by the connecting member 30b, and rotates together with the rotating guide member 31. Furthermore, the retaining member 30 is guided by the groove 31a of the rotating guide member 31 and moves in the back-and-forth direction along the axial direction of the screwdriver head 2.

[0036] The movable member 32 is an example of a transmission member and includes: a first movable member 32a, which rotates together with the retaining member 30 and moves the retaining member 30 in the front-back direction along the rotation guide member 31; a second movable member 32c, which is supported by the first movable member 32a via a bearing 32b and pushes the first movable member 32a via the bearing 32b; and a buffer member 32d, which is mounted on the rear side of the second movable member 32c.

[0037] The first moving member 32a has an inner diameter slightly larger than the outer diameter of the rotary guide member 31, and is constructed of a cylindrical member, for example, that is inserted into the outer side of the rotary guide member 31. The first moving member 32a is supported to be movable along the axial direction of the rotary guide member 31 by means of a connecting member 30b protruding from the groove 31a of the rotary guide member 31.

[0038] Bearing 32b is an example of a bearing, inserted between the outer periphery of the first moving member 32a and the inner periphery of the second moving member 32c. The first moving member 32a is a bearing inner ring retaining member that retains the inner ring of bearing 32b, and the second moving member 32c is a bearing outer ring retaining member that retains the outer ring of bearing 32b. The inner ring of bearing 32b is supported on the outer periphery of the first moving member 32a so that it cannot move in the rotational direction and axial direction, and the outer ring is supported on the inner periphery of the second moving member 32c so that it cannot move in the rotational direction and axial direction.

[0039] Accordingly, the second moving member 32c is connected to the first moving member 32a via a bearing 32b in a state where the movement of the first moving member 32a in the forward and backward direction along the axial direction is restricted. Furthermore, the second moving member 32c supports the first moving member 32a in a rotatable manner via the bearing 32b.

[0040] Therefore, 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 axial back-and-forth direction, and moves together with the second moving member 32c in the axial back-and-forth direction. Furthermore, the first moving member 32a is rotatable relative to the second moving member 32c, while the second moving member 32c is not rotatable relative to the rotation guide member 31.

[0041] The biasing member 33, in this example, is composed of a spring. It is installed outside the rotation guide member 31, between the front frame 10b and the second moving member 32c of the moving member 32, and abuts against the spring seat 32f. The front frame 10b is located on the front side of the housing 10a of the tool body 10, and the spring seat 32f is configured to contact the end face of the outer ring of the bearing 32b. The biasing member 33 is compressed by the moving member 32 moving in the direction before arrow A1, biasing the moving member 32 in the direction after arrow A2.

[0042] The first drive unit 4 includes: a screwdriver bit rotary motor 40, which is driven by electricity supplied by the battery 12; and a reducer 41. The screwdriver bit rotary motor 40 is an example of a first motor. The shaft 40a of the screwdriver bit rotary motor 40 is connected to the reducer 41, and the shaft 41a of the reducer 41 is connected to the rotation guide member 31. The reducer 41 of the first drive unit 4 is constructed using planetary gears, and the screwdriver bit rotary motor 40 is configured to be coaxial with the rotation guide member 31, the holding member 30, and the screwdriver bit 2 held by the holding member 30.

[0043] The first drive unit 4 is mounted on a metal rear frame 10c, on which a screwdriver bit rotary motor 40 and a reducer 41 are installed. The rear frame 10c is located on the rear side of the housing 10a of the tool body 10. The shaft 41a of the reducer 41 is supported by the rear frame 10c via a bearing 42. The rear end of the rotation guide member 31 is connected to the shaft 41a of the reducer 41, and the shaft 41a is supported by the rear frame 10c via a bearing 42, thereby being rotatable.

[0044] The screwdriver bit holding part 3 and the first driving part 4 are connected by a connecting member 10d extending in the front-rear direction to the front frame 10b and the rear frame 10c, and are assembled into one piece. The front frame 10b is fixed to the housing 10a of the tool body 10 by screws 10e.

[0045] Furthermore, the front end of the screwdriver bit holding part 3, which is a rotating guide member 31, is supported by a front frame 10b via a bearing 34a. The front frame 10b is fixed to the front of the housing 10a of the tool body 10. The rear end of the rotating guide member 31 is supported by a rear frame 10c via a shaft 41a of a reducer 41 and a bearing 42. The rear frame 10c is fixed to the rear of the housing 10a. Therefore, the screwdriver bit holding part 3, which is a rotating guide member 31, is supported by the tool body 10 and is rotatable.

[0046] Accordingly, the first drive unit 4 rotates the rotating guide member 31 by means of the screwdriver head rotating motor 40. The holding member 30 holding the screwdriver head 2 is pushed by the groove 31a of the rotating guide member 31 by the connecting member 30b when the rotating guide member 31 rotates, and rotates together with the rotating guide member 31.

[0047] The screwdriver head holding part 3 is provided with a guide member 32g in the second moving member 32c. The connecting structural member 10d is provided with a pair of guide wall parts 10g at a distance slightly larger than the diameter of the guide member 32g. The guide member 32g is inserted between the pair of guide wall parts 10g, and the pair of guide wall parts 10g are opposite to the circumferential surface of the guide member 32g.

[0048] Accordingly, the second moving member 32c is guided by the connecting member 10d via the guide member 32g, and can move in the forward and backward directions indicated by arrows A1 and A2 along the axis of the screwdriver head 2, and is restricted from rotating in accordance with the rotation of the rotating guide member 31.

[0049] Figures 6A and 6B are top cross-sectional views showing an example of the internal structure of the fastening tool of this embodiment, and show details of the second drive unit 5. Next, referring to the figures, the second drive unit 5 will be described.

[0050] The second drive unit 5 includes: a screwdriver bit rotary motor 50, which is driven by electricity supplied by the battery 12; and a reducer 51. The screwdriver bit rotary motor 50 is an example of a motor, a second motor. The shaft 50a of the screwdriver bit rotary motor 50 is connected to the reducer 51, and the shaft 51a of the reducer 51 is connected to a pulley 52, which is an example of a rotating component. The pulley 52 of the second drive unit 5 is supported by the tool body 10 via a bearing 53. The shaft 50a of the screwdriver bit rotary motor 50 is arranged in the second drive unit 5 along the extension direction of the handle 11.

[0051] The second drive unit 5 is an example of a transmission member. One end of a linear wire 54 is connected to a pulley 52, and the wire 54 is wound around the outer periphery 52a of the pulley 52 by the rotation of the pulley 52. ​​The other end of the wire 54 is connected to a wire connection part 32h, which is provided in the second moving member 32c of the moving member 32. The transmission member can be flexible enough to be wound around the outer periphery of a rotating member such as a pulley 52; it can be a rope made of fibers, a belt made of rubber, or a chain made of metal. In the case where the transmission member is a chain, the rotating member can also be a sprocket with teeth.

[0052] Accordingly, the second drive unit 5 rotates the pulley 52 by means of the screwdriver bit rotation motor 50, and moves the second moving member 32c in the forward direction indicated by arrow A1 by winding the wire 54. The screwdriver bit holding unit 3 moves forward by means of the second moving member 32c, pushes the first moving member 32a via the bearing 32b, and the first moving member 32a and the second moving member 32c move together in the forward direction along the axial direction. By means of the forward movement of the first moving member 32a, the holding member 30 connected to the first moving member 32a via the connecting member 30b moves forward, and the screwdriver bit 2 held by the holding member 30 moves in the forward direction indicated by arrow A1.

[0053] The second drive unit 5 is disposed offset to one side of the fastening tool 1 in the left-right direction, such that the tangential direction of the portion of the pulley 52 where the wire 54 is wound is along the extending direction of the rotary guide member 31. That is, in this example, the center of the pulley 52 is offset to one side of the rotary guide member 31 along the shaft 50a of the screwdriver head moving motor 50, and when viewed from the axial direction of the pulley 52, the outer periphery 52a of the pulley 52 where the wire 54 is wound overlaps with the rotary guide member 31.

[0054] Furthermore, as shown in Figures 6A and 6B, the wire 54 between the pulley 52 and the second moving member 32c is arranged in a manner that is parallel to the axis of the rotating guide member 31 in the radial direction of the pulley 52, and as shown in Figure 1A, the pulley 52 and the like are also arranged in a manner that is parallel to the axis of the screwdriver head moving motor 50, which is orthogonal to the radial direction of the pulley 52.

[0055] Furthermore, when the wire 54 is wound around the pulley 52 in overlapping fashion, the distance from the center of the pulley 52 to the wire 54 changes with the number of turns, so the amount of movement of the screwdriver head 2 when the pulley 52 rotates once changes. Also, the angle between the direction in which the wire 54 extends between the pulley 52 and the second moving member 32c and the direction of movement of the screwdriver head 2 along the axis of the rotation guide member 31 changes.

[0056] Here, the diameter of the pulley 52 is set in such a way that the moving member 32 moves from one end to the other within a movable range along one direction, and the rotation amount α of the pulley 52 required to move the screwdriver head 2 by a predetermined amount is less than 360°.

[0057] Therefore, in order to move the screwdriver bit 2 by a predetermined amount, the action of winding the wire 54 by the pulley 52, as shown in FIG6B, prevents the wire 54 from being wound by the pulley 52 without overlap, thus suppressing the incorrect amount of movement of the screwdriver bit 2. Furthermore, it suppresses the change in the parallelism between the extension direction of the wire 54 between the pulley 52 and the second moving member 32c and the movement direction of the screwdriver bit 2 along the axis of the rotation guide member 31.

[0058] Therefore, throughout the entire movable range of the holding member 30, the rotation amount of the screwdriver bit moving motor 50 and the movement amount of the holding member 30 are in a one-to-one relationship. By controlling the rotation amount of the screwdriver 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 screwdriver bit moving motor 50, the movement amount of the screwdriver bit 2 mounted on the holding member 30 can be controlled.

[0059] Furthermore, regardless of the amount of winding of the wire 54, the tension acting on the wire 54 is always parallel to the direction of movement of the screwdriver head 2 along the axis of the rotating guide member 31, which can suppress the movement of the screwdriver head 2 and the reduction in the transmission efficiency of the force of pushing the screw 200 through the screwdriver head 2.

[0060] In this way, the wire 54 between the pulley 52 and the second moving member 32c extends into a straight line along the moving direction of the moving member 32, thereby suppressing the increase in load when the wire 54 is wound by the pulley 52 and the increase in load when the wire 54 is pulled out from the pulley 52.

[0061] Furthermore, because the wire 54 is flexible enough to be wound around the pulley 52, there is no situation where the second moving member 32c is pushed and the moving member 32 moves backward. Here, a biasing member 33 is provided, which is compressed by the moving member 32 moving in the forward direction shown by arrow A1, and applies a force to the moving member 32 pushing it in the backward direction shown by arrow A2. In this way, in the configuration where the wire 54 is wound around the pulley 52 and the screwdriver head 2 is advanced, the screwdriver head 2 can be retracted after it has advanced.

[0062] Furthermore, the retaining member 30 of the screwdriver bit 2 is supported by the engagement of the connecting member 30b and the groove 31a, and is movable in the front-back direction by the pair of rotating guide members 31, and rotates together with the rotating guide members 31. The connecting member 30b is provided on the retaining member 30, and the groove 31a is provided on the rotating guide member 31.

[0063] Therefore, by configuring the screwdriver bit rotation motor 40 to be coaxial with the rotation guide member 31, the holding member 30, and the screwdriver bit 2 held by the holding member 30, it is not necessary to move the screwdriver bit rotation motor 40 in the front-back direction. It is possible to rotate the screwdriver bit 2 and move the screwdriver bit 2 in the front-back direction.

[0064] Furthermore, in the configuration where the screwdriver bit rotary motor 40 is arranged coaxially with the screwdriver bit 2, the rotational motion of the screwdriver bit rotary motor 40 is converted into the forward and backward movement of the screwdriver bit 2 by using the feed screw.

[0065] However, in the case of using the feed screw, the amount of movement of the screwdriver head 2 per motor revolution cannot be large. Even if the motor speed is increased, it is difficult to increase the movement speed of the screwdriver head 2.

[0066] In the fastening tool 1, in order to shorten the time it takes for the screw 200 to be pressed against the object being fastened by the screwdriver bit 2, it is necessary to increase the moving speed of the screwdriver bit 2. However, with the configuration of the feed screw, it is difficult to shorten the time it takes for the screw 200 to be pressed against the object being fastened by the screwdriver bit 2.

[0067] In contrast, the holding member 30 of the screwdriver bit 2 is supported by a pair of rotating guide members 31 that are movable in the front-rear direction. The pulley 52 is rotated by the second drive unit 5 to wind the wire 54, and the holding member 30 moves in the forward direction. This configuration allows the screwdriver bit 2 to move faster due to the rotational speed of the screwdriver bit moving motor 50. Therefore, the time required to press the screw 200 to the object being fastened by the screwdriver bit 2 can be shortened.

[0068] Figures 7A and 7B are cross-sectional views showing one example of the disassembly and mounting mechanism, and Figures 8A and 8B are perspective views showing one example of the disassembly and mounting mechanism, and show details of the disassembly and mounting mechanism 30c. Next, referring to the figures, the disassembly and mounting mechanism 30c will be described.

[0069] The disassembly and fixing mechanism 30c includes: a ball 30d protruding from the opening 30a; and a spring 30e that pushes the ball 30d in the direction protruding from the opening 30a. The spring 30e is an example of a pushing member, which 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 a ring-shaped leaf spring and is fitted into the outer periphery of the fixing member 30.

[0070] When the screwdriver bit 2 is inserted into the opening 30a of the retaining member 30, the disassembly and assembly retaining mechanism 30c is caused by the ball 30d pushed by the insertion part 20 to deform the spring 30e in the direction of increasing the diameter of the annular spring 30e, and to retract towards the outer periphery of the retaining member 30.

[0071] When the screwdriver bit 2 is inserted into the opening 30a of the retaining member 30 to a position opposite to the ball 30d, the groove 20a formed on the outer periphery of the insertion portion 20 engages with the groove 20a by means of the spring 30e. This prevents the screwdriver bit 2 from accidentally disengaging from the retaining member 30.

[0072] Furthermore, when a force above a predetermined value is applied in the direction of pulling out the screwdriver bit 2 from the holding member 30, the spring 30e deforms in the direction of increasing the diameter of the annular spring 30e, and the ball 30d retracts, thereby allowing the screwdriver bit 2 to be pulled out from the holding member 30.

[0073] When inserting or removing the screwdriver bit 20 into the opening 30a of the retaining member 30, the ball 30d retracts towards the outer periphery of the retaining member 30. Therefore, space is required for the ball 30d to retract on the outer periphery of the retaining member 30. On the other hand, since the retaining member 30 is inserted into the interior of the cylindrical rotary guide member 31, space for the ball 30d to retract cannot be guaranteed between the outer periphery of the retaining member 30 and the inner periphery of the rotary guide member 31.

[0074] Furthermore, in order to ensure the space for the ball 30d to retract between the outer periphery of the retaining member 30 and the inner periphery of the rotating guide member 31, when setting the diameter difference between the retaining member 30 and the rotating guide member 31, since the radial dimension of the screwdriver head 2 is fixed, it is impossible to reduce the outer diameter of the retaining member 30, and it is necessary to increase the outer diameter of the rotating guide member 31. Therefore, the device becomes larger.

[0075] In contrast, the rotary guide member 31 is provided with a groove 31a of the guide connecting member 30b. The groove 31a extends from the inner circumference of the rotary guide member 31 to the outer circumference and extends axially in the rotary guide member 31.

[0076] Here, the detachment and holding mechanism 30c is configured such that the ball 30d is aligned with the groove 31a of the rotary guide member 31. That is, the holding member 30 is provided with a connecting member 30b and the ball 30d of the detachment and holding mechanism 30c on the same axis as the rotary guide member 31. Thus, in any action of the detachment and holding mechanism 30c, whether the rotary guide member 31 and the holding member 30 rotate, or the holding member 30 moves axially relative to the rotary guide member 31, the ball 30d is exposed in the groove 31a of the rotary guide member 31.

[0077] Therefore, by inserting and removing the screwdriver bit 20 into the opening 30a of the holding member 30, the ball 30d, which is retracted in the outer peripheral direction of the holding member 30, enters the groove 31a of the rotating guide member 31.

[0078] Therefore, by inserting the retaining member 30 into the cylindrical rotary guide member 31, space can be ensured for the ball 30d of the detachment and installation retaining mechanism 30c to retract. Furthermore, by making the groove 31a into which the connecting member 30b enters also serve as space for the ball 30d to retract, the area of ​​the opening provided in the rotary guide member 31 is suppressed, thereby ensuring strength.

[0079] Furthermore, it is not necessary to increase the diameter difference between the holding member 30 and the rotating guide member 31 in order to ensure the space for the ball 30d to retreat between the outer periphery of the holding member 30 and the inner periphery of the rotating guide member 31, thereby suppressing the enlargement of the device.

[0080] Figure 9 is a perspective view showing an example of the screw feed section and nose of this embodiment, showing details of the screw feed section 7 and the nose 8. Next, referring to the figures, the screw feed section 7 and the nose 8 will be described.

[0081] The screw feed unit 7 includes: a screw feed motor 70; a pinion 71, which is mounted on the shaft of the screw feed motor 70 via a reducer; a rack 72, which meshes with the pinion 71; and a locking part 73, which is connected to the rack 72 and engages with the connecting screw fed from the screw storage part 6.

[0082] The screw feed unit 7 is supported by a rack 72 and is movable in the up-down direction along the feed direction of the connecting screw. The screw feed unit 7 is fed by the screw feed motor 70 rotating forward and backward, and the engaging part 73 that engages with the connecting screw moves in the up-down direction.

[0083] The nose tip 8 includes: an injection passage 80 through which the screw 200 is supplied by the screw feed section 7 and through which the screwdriver head 2 passes; a contact member 81 having an injection outlet 81a communicating with the injection passage 80 and contacting the object to be fastened; a contact arm 82 linked to the contact member 81 and moving in the back-and-forth direction; and an adjustment section 83 that limits the amount of movement of the contact arm 82. Furthermore, the nose tip 8 includes a covering member 88 that can be opened and closed to cover the path through which the screw 200 passes from the screw storage section 6 to the injection passage 80.

[0084] The fastening tool 1 is assembled with various parts that constitute the injection passage 80, the contact member 81, and the contact arm 82 to form the nose tip 8, and is fixed to the front frame 10b and the nose body portion 10f that constitute the tool body 10. In addition, the fastening tool 1 has a contact switch portion 84, which is actuated by being pushed by the contact arm 82.

[0085] The nose tip 8 is a contact member 81 supported so as to be movable in the front-back direction as indicated by arrows A1 and A2. The contact arm 82 moves in the front-back direction in conjunction with the contact member 81. The nose tip 8 biases the contact member 81 in the forward direction by a biasing member (not shown). The contact member 81, which is pressed against the fastening object and has already moved backward, is biased by the biasing member and moves forward.

[0086] When the nose tip 8 is pressed against the fastening object, the contact arm 82 moves backward. The adjustment part 83 adjusts the amount of movement of the contact arm 82 until the contact switch part 84 is activated. The contact switch part 84 switches between active and inactive by being pushed by the contact arm 82. In this example, the state in which the contact switch part 84 is not activated when not pushed by the contact arm 82 is considered as the contact switch part 84 being off, and the state in which the contact switch part 84 is activated when pushed by the contact arm 82 is considered as the contact switch part 84 being on.

[0087] Next, referring to the figures, the configuration of the control and operation of the fastening tool 1 will be explained. The fastening tool 1 includes: a trigger 9, which receives operation; and a trigger switch 90, which 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 holding the handle 11. The trigger switch 90 is actuated by being pushed by the trigger 9.

[0088] The trigger switch 90 switches the presence or absence of action by being pushed by the trigger 9. In this example, the state in which the trigger 9 is not operated, the trigger 9 does not push the trigger switch 90, and the trigger switch 90 does not act is regarded as the trigger switch 90 being off. The state in which the trigger 9 is operated, the trigger switch 90 is pushed by the trigger 9 and acts is regarded as the trigger switch 90 being on.

[0089] The fastening tool 1 is equipped with a control unit 100, which controls the first drive unit 4, the second drive unit 5 and the screw feed unit 7 according to the output of the trigger switch unit 90 and the contact switch unit 84. The trigger switch unit 90 is activated by the operation of the trigger 9, and the contact switch unit 84 is activated by the contact member 81.

[0090] The control unit 100 is composed of a substrate for assembling various electronic components, and is disposed in the substrate storage unit 111 between the screw storage unit 6 and the handle 11. It is disposed on the back side of the screw storage unit 6.

[0091] In power tools used by gripping the handle, a storage section is provided in front of the handle to store consumables such as screws. Furthermore, in order to make the handle gripable, space is required between the handle and the storage section for fingers to enter.

[0092] Here, the fastening tool 1 utilizes the space between the screw storage part 6 and the handle 11 to provide a substrate storage part 111 on the back side of the screw storage part 6.

[0093] In a power tool used by gripping the handle, it is proposed that a battery be installed in the lower part of the handle, and a substrate be provided between the handle and the battery. With this configuration, the vertical dimension of the power tool along the extension direction of the handle is increased.

[0094] Conversely, by providing a substrate storage portion 111 on the back side of the screw storage portion 6, the vertical expansion of the fastening tool 1 along the extending direction of the handle 11 is suppressed. Furthermore, the screw storage portion 6 is designed to accommodate a connecting screw wound into a spiral shape, and the surface of the screw storage portion 6 facing the handle 11 is approximately circular. This suppresses the enlargement of the fastening tool 1 while ensuring the volume of the substrate storage portion 111.

[0095] Figures 10A to 10C are perspective views from the rear of an example of the fastening tool of this embodiment, and Figure 11 is a perspective view of an example of the setting part, showing details of the setting part 110. Next, the setting part 110 will be described with reference to the figures.

[0096] The fastening tool 1 is equipped with a second drive unit 5 that moves the screwdriver bit 2 in the forward and backward direction along the axial direction, and is configured such that the second drive unit 5 is driven by a screwdriver bit moving motor 50, and a moving member 32 connected to a pulley 52 via a wire 54 and a holding member 30 connected to the moving member 32 moves along the rotation guide member 31 in the forward direction along the axial direction of the screwdriver bit 2. The pulley 52 is rotated by the screwdriver bit moving motor 50.

[0097] Accordingly, by controlling the rotation of the screwdriver bit moving motor 50, the movement (forward movement) of the screwdriver bit 2 can be controlled. That is, by rotating the screwdriver bit moving motor 50 in conjunction with the rotation of the screwdriver bit rotating motor 40, and controlling the forward movement of the screwdriver bit 2 following the screw 200 as the screw 200 is tightened, the axial stop position of the screwdriver bit 2 can be controlled. The screwdriver bit rotating motor 40 rotates the screwdriver bit 2 in the direction of tightening the screw 200.

[0098] Therefore, the fastening tool 1 is equipped with a setting unit 110, which sets the advance amount of the screwdriver head 2. The setting unit 110 is an example of a setting means, and is configured to allow selection of any setting value from a plurality of setting values, or to allow selection of any setting value steplessly.

[0099] In this example, the setting unit 110 is configured to select a setting value using an operation unit 110a consisting of buttons. Alternatively, the operation unit 110a may be configured to select a setting value using a rotary knob. Furthermore, the setting unit 110 may also be configured to display the setting value so that the operator can easily grasp the current setting value. This setting value may be selected using a method such as indicating the current value with a label or engraving, or displaying the current value using a display unit 110b such as an LED.

[0100] The setting part 110 is located on the left and right sides of the surface opposite to the handle 11 of the substrate storage part 111. The substrate storage part 111 is located on the back side of the screw storage part 6.

[0101] Thus, when observing the fastening tool 1 from the rear, the setting part 110 can be seen from the left and right sides of the handle 11.

[0102] In the usage mode where the handle 11 is held, the side of the screw storage section 6 facing the handle 11 faces the operator holding the tightening tool 1. Here, the substrate storage section 111 has a setting section 110 on the side facing the handle 11, and the display section 110b provided on the setting section 110 is easily visible. The substrate storage section 111 is located on the back side of the screw storage section 6. Therefore, the possibility of the operator missing the display is reduced. Furthermore, the content displayed on the display section 110b includes not only the screw depth setting value determined by the advance distance of the screwdriver bit 2, but also the ON / OFF status of the power supply, the operating mode selected from various selectable operating modes, the presence or absence of a screw, the amount of screw residue, and the presence or absence of any abnormalities.

[0103] Furthermore, when using the handle 11, the operating section 110a, including the buttons provided on the setting section 110, is easily visible. Therefore, when holding the handle 11 with one hand, the operator can operate the operating section 110a with the other hand while looking at it, allowing for reliable operation. Moreover, the display section 110b can be seen without changing posture or significantly altering the line of sight during operation, thus preventing the operator from missing alarms or other notifications during continuous operation. Additionally, it prevents the operator from overlooking the nozzle 81a being directed towards them while focusing on the display section 110b or the operating section 110a.

[0104] Furthermore, the substrate storage section 111 houses the substrate constituting the control section 100. On this substrate, on the side facing the handle 11, by assembling switches constituting the operation section 110a and lamps constituting the display section 110b, the substrate for the setting section 110, which is separate from the control section 100, can be omitted. <Example of the operation of the fastening tool in this embodiment>

[0105] FIG12A is a side cross-sectional view showing an example of the operation of the fastening tool of this embodiment, and FIG12B is a top cross-sectional view showing an example of the operation of the fastening tool of this embodiment. Next, referring to the figures, the locking operation of the fastening tool of this embodiment will be explained.

[0106] The fastening tool 1 is in standby mode, as shown in Figure 1A. The head of the screwdriver bit 2 is located in standby position P1 behind the injection passage 80, and screws 200 can be supplied to the injection passage 80.

[0107] The control unit 100 presses the contact member 81 against the object to be fastened, pushes the contact switch 84 by the contact arm 82, and the contact switch 84 becomes conductive, operates the trigger 9, and when the trigger switch 90 becomes conductive, drives the screwdriver bit moving motor 50 of the second drive unit 5, and drives the screwdriver bit rotating motor 40 of the first drive unit 4 in a predetermined sequence.

[0108] When the screwdriver bit moving motor 50 is driven to rotate in the positive direction, the pulley 52 rotates in the positive direction, and the wire 54 is wound on the pulley 52. ​​By winding the wire 54 on 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 compresses the bias member 33 while moving in the forward direction along the axial direction.

[0109] When the first moving member 32a moves forward, the holding member 30 connected to the first moving member 32a by the connecting member 30b moves forward along the axis of the screwdriver head 2 under the guidance of the groove 31a of the rotating guide member 31 in the connecting member 30b.

[0110] Thereby, the screwdriver head 2 held by the holding member 30 moves in the forward direction as indicated by arrow A1, engages with the screw 200 supplied at the ejection port 80 of the nose 8, and moves the screw 200 forward to press against the object to be fastened.

[0111] When the screwdriver bit rotary motor 40 is driven to rotate in the positive direction, the rotary guide member 31 rotates in the positive direction. When the rotary guide member 31 rotates in the positive direction, the connecting member 30b connected to the holding member 30 is pushed by the groove 31a of the rotary guide member 31, thereby causing the holding member 30 and the rotary guide member 31 to rotate together.

[0112] In this way, the screwdriver head 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 is linked to the action of rotating the screwdriver head 2 by the first drive unit 4 to screw the screw into the object to be fastened. According to the load acting on the screwdriver head rotation motor 40, the number of rotations of the screwdriver head rotation motor 40, the load acting on the screwdriver head movement motor 50, the number of rotations of the screwdriver head movement motor 50, etc., the second drive unit 5 moves the screwdriver head 2 forward, thereby making the screwdriver head 2 follow the screw being screwed into the object to be fastened.

[0113] As shown in Figures 12A and 12B, when the tip of the screwdriver bit 2 protrudes from the ejection port 81a of the contact member 81 and reaches the predetermined end position P2, the control unit 100 stops driving the screwdriver bit rotation motor 40 and reverses the screwdriver bit movement motor 50. The control unit 100 determines that the tip of the screwdriver bit 2 has reached the end position P2 based on the number of rotations of the screwdriver bit movement motor 50.

[0114] When the screwdriver bit moving motor 50 rotates in the opposite direction, the pulley 52 rotates in the opposite direction, pulling the wire 54 out from the pulley 52. ​​As the wire 54 is pulled out from the pulley 52, the biasing member 33, which is compressed by the forward movement of the second moving member 32c, extends and pushes the second moving member 32c in the rearward direction.

[0115] The second moving member 32c is pushed rearward by the biasing member 33, thereby being guided by the rotational guide member 31 and moving in the rearward direction along the axial direction. When the second moving member 32c moves rearward, the first moving member 32a is pushed by the second moving member 32c via the bearing 32b, and moves together with the second moving member 32c in the rearward direction along the axial direction.

[0116] When the first moving member 32a moves in the rearward direction, the holding member 30 connected to the first moving member 32a by the connecting member 30b moves in the rearward direction along the axis of the screwdriver head 2 under the guidance of the groove 31a of the rotating guide member 31 in the connecting member 30b.

[0117] This causes the screwdriver bit 2 held by the holding member 30 to move rearward, and the tip of the screwdriver bit 2 returns to the standby position P1. Furthermore, the moving member 32, by having a buffer member 32d made of rubber or the like on the rear side of the second moving member 32c, suppresses direct collision between the second moving member 32c and the rear frame 10c during the rearward movement of the second moving member 32c, thereby suppressing noise generation or damage. The control unit 100 stops the rotation of the screwdriver bit moving motor 50 when the tip of the screwdriver bit 2 returns to the standby position P1 by pushing the second moving member 32c rearward using the bias member 33. When the trigger switch 90 is deactivated, the control unit 100 rotates the screw feed motor 70 in one direction, causing the engaging part 73 to descend. When the engaging part 73 descends to the position where it engages with the next screw 200, the control unit 100 reverses the screw feed motor 70 to raise the engaging part 73 and supply the next screw 200 to the supply passage 80.

[0118] Figures 13A to 13C are cross-sectional views showing the tightened state of the screw. Figure 13A shows the state in which the head 201 of the screw 200 is not raised or buried from the surface of the fastened object 202, which is called being on the same plane. Figure 13B shows the state in which the head 201 of the screw 200 is raised from the fastened object 202. Figure 13C shows the state in which the head 201 of the screw 200 is buried in the fastened object 202.

[0119] When the screwdriver bit 2 has reached the end position P2, if the screw 200 is a flat-head screw, as shown in Figure 13A, it is preferable to set the advance of the screwdriver bit 2 so that the surface of the head 201 of the screw 200 and the surface of the object being fastened 202 are on the same plane. Furthermore, the screw 200 is not limited to a flat-head screw; if it is a round-head screw, a Okayama-head screw, a large flat-head screw, etc., it is preferable to set the advance of the screwdriver bit 2 so that the seat surface of the head 201 of the screw 200 contacts the surface of the object being fastened 202, without the head 201 of the screw 200 lifting off the object being fastened 202.

[0120] When the tip of the screwdriver bit 2 has reached the end position P2, if the head 201 of the screw 200 is in a state where it is lifted from the object being fastened 202 as shown in Figure 13B, the forward advance of the screwdriver bit 2 should be increased to advance the end position P2. On the other hand, if the head 201 of the screw 200 is in a state where it is embedded in the object being fastened 202 as shown in Figure 13C, the forward advance of the screwdriver bit 2 should be decreased to retract the end position P2.

[0121] Here, the movement amount (forward amount) of the screwdriver bit 2 can be set via the setting unit 110. The movement amount (forward amount) of the screwdriver bit 2 is determined by the number of rotations (rotation amount) of the screwdriver bit movement motor 50. Furthermore, starting from the standby position P1, which is the starting position of the screwdriver bit 2, the screwdriver bit movement motor 50 is rotated only by the set rotation amount, and then the screwdriver bit movement motor 50 stops rotating or reverses, thereby controlling the operation end position P2. Therefore, the locking depth can be adjusted. [Simplified Explanation of the Diagram]

[0018] Figure 1A is a side sectional view showing an example of the internal structure of the fastening tool of this embodiment. Figure 1B is a top sectional view showing an example of the internal structure of the fastening tool of this embodiment. Figure 1C is a front sectional view showing an example of the internal structure of the fastening tool of this embodiment. Figure 2A is an exploded perspective view showing an example of the internal structure of the fastening tool of this embodiment. Figure 2B is an external perspective view showing an example of the fastening tool of this embodiment. Figure 3A is a perspective view showing an example of the main components of the fastening tool of this embodiment. Figure 3B is a perspective view showing an example of the main components of the fastening tool of this embodiment. Figure 4A is a sectional perspective view showing an example of the main components of the fastening tool of this embodiment. Figure 4B is a sectional perspective view showing an example of the main components of the fastening tool of this embodiment. Figure 4C is a sectional perspective view showing an example of the main components of the fastening tool of this embodiment. Figure 5 is a top sectional view showing an example of the main components of the fastening tool of this embodiment. Figure 6A is a top cross-sectional view showing an example of the internal structure of the fastening tool of this embodiment. Figure 6B is a top cross-sectional view showing an example of the internal structure of the fastening tool of this embodiment. Figure 7A is a cross-sectional view showing an example of the disassembly and assembly holding mechanism. Figure 7B is a cross-sectional view showing an example of the disassembly and assembly holding mechanism. Figure 8A is a perspective view showing an example of the disassembly and assembly holding mechanism. Figure 8B is a perspective view showing an example of the disassembly and assembly holding mechanism. Figure 9 is a perspective view showing an example of the screw feed part and nose of this embodiment. Figure 10A is a perspective view of an example of the fastening tool of this embodiment viewed from the rear. Figure 10B is a perspective view of an example of the fastening tool of this embodiment viewed from the rear. Figure 10C is a perspective view of an example of the fastening tool of this embodiment viewed from the rear. Figure 11 is a perspective view showing an example of the setting part. Figure 12A is a side cross-sectional view showing an example of the operation of the fastening tool of this embodiment. Figure 12B is a top cross-sectional view showing an example of the operation of the fastening tool according to this embodiment. Figure 13A is a cross-sectional view showing the screw in the tightened state. Figure 13B is a cross-sectional view showing the screw in the tightened state. Figure 13C is a cross-sectional view showing the screw in the tightened state.

Claims

1. A fastening tool, comprising: A cylindrical rotating guide component extends in one direction and is supported by bearings to be rotatable; The retaining member has an opening for detachably inserting a screwdriver bit, moves axially along the extending direction of the rotary guide member inside the rotary guide member, and rotates together with the rotary guide member; the moving member moves the retaining member along the rotary guide member in the front-rear direction; the rotating member is driven to rotate by a motor; and the transmission member is connected to the moving member and has flexibility to be wound around the outer periphery of the rotating member; the rotating member is rotated by the motor, thereby moving the moving member by the transmission member in a direction that presses the screw engaging with the screwdriver bit against the fastening object; wherein, the amount of movement of the retaining member along the axial direction of the rotary guide member is controlled by controlling the amount of rotation of the motor.

2. The fastening tool of claim 1, wherein the transmission member extends in a direction parallel to the extension direction of the rotary guide member.

3. The fastening tool as claimed in claim 1 or 2, wherein the center of the rotating member is biased to one side relative to the rotating guide member, and the outer periphery of the rotating member wrapped around the transmission member overlaps with the rotating guide member when viewed from the axial direction of the rotating member.

4. The fastening tool as requested in item 1 or 2, wherein the shaft of the motor is biased to one side toward the rotary guide member.

5. The fastening tool as claimed in claim 1 or 2, wherein the amount of rotation of the rotating member required to move the movable member from one end to the other within a movable range along one direction is set to less than 360°.

6. The fastening tool as claimed in claim 1 or 2, wherein a biasing member is compressed by moving the moving member in a direction that presses the screw engaging with the screwdriver head against the object being fastened, and biases the moving member in another direction opposite to the first direction.

Images