Handheld tools

Abstract

To provide a screw driving machine facilitating operation for opening / closing a magazine with a magazine cap portion and a door portion.SOLUTION: A screw driving machine 1A is equipped with a magazine 90 that stores a screw coupler in which a plurality of screws is coupled by a coupling band, a magazine cap portion 97 that covers the magazine 90 so as to open / close, and a door portion 98 that is integrally coupled to the magazine cap portion 97 through a coupling shaft 98a. The magazine cap portion 97 and the door portion 98 takes a form bending due to relative rotations around the coupling shaft 98a in an opening state opening the magazine 90, and takes a form linearly extending in a closing state closing the magazine 90.SELECTED DRAWING: Figure 1A

Description

Technical Field

[0001] The present invention relates to a hand tool that includes a magazine capable of accommodating fasteners and injects the fasteners accommodated in the magazine.

Background Art

[0002] A hand tool that injects fasteners such as screws and nails includes a magazine that accommodates the fasteners. The magazine accommodates a fastener connector in which a plurality of fasteners are connected by a connecting band. In such a tool, a nose portion where the fastener is injected, a magazine cap portion provided on the magazine to enable loading of the fastener connector into the magazine, and a door portion provided on the nose portion are each configured to be able to open and close (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, it has been necessary to independently open and close the magazine cap portion provided on the magazine and the door portion provided on the nose portion, and the operation of opening and closing the magazine with the magazine cap portion and the door portion is troublesome.

[0005] The present invention has been made to solve such problems, and an object thereof is to provide a hand tool that facilitates the operation of opening and closing the magazine with the magazine cap portion and the door portion.

Means for Solving the Problems

[0006] To solve the above-mentioned problems, the present invention provides a handheld tool comprising: a nose portion having an injection passage for a fastener; a magazine housing the fastener and positioned in a direction intersecting the injection passage; a magazine cap portion including a tip portion on the injection passage side and a base portion opposite to the tip portion in the direction of intersecting, wherein the tip portion rotates in a direction toward and toward the magazine with the base portion as a pivot point, thereby opening and closing the magazine; and a door portion rotatably connected to the tip portion of the magazine cap portion via a connecting shaft. The nose portion has an engagement portion that can engage with the door portion, and the door portion bends toward the magazine with the connecting shaft as a pivot point when the magazine cap portion is open, and extends linearly to engage with the engagement portion when the magazine cap portion is closed.

[0007] In this invention, when the magazine cap and door are bent by rotation around the connecting shaft as a pivot point, the distance between the base end of the magazine cap and the tip end of the door is shorter compared to when the magazine cap and door are extended in a straight line. As a result, in the bent configuration, when the magazine cap and door are opened and closed by rotation around the base end of the magazine cap as a pivot point, the door does not engage with the engaging part. In contrast, when the magazine is closed by the magazine cap and door, the magazine cap and door are extended in a straight line, and the door engages with the engaging part. In this way, by changing the magazine cap and door from a bent configuration to a straight-extended configuration, the magazine cap and door are closed. [Effects of the Invention]

[0008] In this invention, the magazine cap and door are rotatably connected via a connecting shaft, so that when the magazine cap and door are bent, the engaging portion does not obstruct the opening and closing of the magazine by the magazine cap and door. In contrast, when the magazine is closed by the magazine cap and door, the magazine cap and door extend in a straight line, and the door engages with the engaging portion. As a result, the magazine cap and door can be opened and closed as a single unit, making it easy to open and close the magazine using the magazine cap and door. [Brief explanation of the drawing]

[0009] [Figure 1A] This is a perspective view showing an example of a screw-driving machine according to this embodiment. [Figure 1B] This is a perspective view showing an example of a screw-driving machine according to this embodiment. [Figure 2A] This is a perspective view showing an example of a screw-driving machine according to this embodiment. [Figure 2B] This is a perspective view showing an example of a screw-driving machine according to this embodiment. [Figure 3A] This is a front view showing an example of a screw-driving machine according to this embodiment. [Figure 3B] This is a front view showing an example of a screw-driving machine according to this embodiment. [Figure 3C] This is a front cross-sectional view showing an example of a screw-driving machine according to this embodiment. [Figure 4A] This is a side cross-sectional view showing an example of a screw-driving machine according to this embodiment. [Figure 4B] This is a front cross-sectional view showing an example of a screw-driving machine according to this embodiment. [Figure 4C] This is a bottom cross-sectional view showing an example of a screw-driving machine according to this embodiment. [Figure 5] This is a perspective view showing an example of a screw-type connector. [Figure 6A] This is a cross-sectional view showing an example of the opening and closing operation of the magazine cap and door. [Figure 6B] This is a perspective view showing an example of the opening and closing operation of the magazine cap and door. [Figure 7] This is a side cross-sectional view of a screw driving machine, illustrating an example of the operation of driving a screw into a material and tightening it. [Figure 8A] This is a front cross-sectional view of a screw driving machine, illustrating an example of the operation of driving a screw into a material and tightening it. [Figure 8B] This is a front cross-sectional view of a screw driving machine, illustrating an example of the operation of driving a screw into a material and tightening it. [Figure 8C] This is a front cross-sectional view of a screw driving machine, illustrating an example of the operation of driving a screw into a material and tightening it. [Figure 8D] It is a front cross-sectional view of a screw driver showing an example of the operation of driving and tightening a screw into a driven material. [Figure 8E] It is a front cross-sectional view of a screw driver showing an example of the operation of driving and tightening a screw into a driven material. [Figure 8F] It is a front cross-sectional view of a screw driver showing an example of the operation of driving and tightening a screw into a driven material. [Figure 8G] It is a front cross-sectional view of a screw driver showing an example of the operation of driving and tightening a screw into a driven material. [Figure 9] It is a bottom cross-sectional view of a screw driver showing an example of the state where the screws in the magazine are used.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, with reference to the drawings, embodiments of a screw driver as an example of a hand tool of the present invention will be described.

[0011] <Configuration Example of the Screw Driver of the Present Embodiment> FIGS. 1A, 1B, 2A, and 2B are perspective views showing an example of the screw driver of the present embodiment. FIG. 1A shows a state where the magazine is open and no screws are loaded, and FIG. 1B shows a state where the magazine is open and screws are loaded. Further, FIG. 2A shows a state where the magazine is closed and no screws are loaded, and FIG. 2B shows a state where the magazine is closed and screws are loaded.

[0012] Further, FIGS. 3A and 3B are front views showing an example of the screw driver of the present embodiment. FIG. 3A shows a state where the magazine is Open in a state and screws are loaded, and FIG. 3B shows a state where the magazine is closed in a state and screws are loaded. Further, FIG. 3C is a front cross-sectional view showing an example of the screw driver of the present embodiment. Also, FIG. 4A is a side cross-sectional view showing an example of the screw driver of the present embodiment, FIG. 4B is a front cross-sectional view showing an example of the screw driver of the present embodiment, and FIG. 4C is a bottom cross-sectional view showing an example of the screw driver of the present embodiment. Also, FIG. 5 is a perspective view showing an example of a screw connector.

[0013] As shown in Figure 5, the screw gun 1A has multiple screws 200, which act as fasteners, connected by a connecting band 201, and a screw connector 203, for example, in a spiral shape, is used as the fastener connector. Unused screw connectors 203 are secured with tape 204 to prevent them from losing their spiral shape. The connecting band 201 may be made of a plastic sheet of a predetermined shape that supports the shaft portion of screws 200 or nails, or multiple fasteners may be bonded together with tape or welded together with metal wire.

[0014] The screw driving machine 1A is powered by compressed air and includes a fastening section 3 that moves a driver bit 2 axially to drive a screw 200 into a workpiece 300, and then rotates the driver bit 2 to tighten the screw 200. The fastening section 3 includes a striking cylinder 30 that moves the driver bit 2 axially and an air motor 31 that rotates the driver bit 2 around its axis.

[0015] Furthermore, the screw driving machine 1A includes a main valve 5 that switches whether or not compressed air is supplied to the impact cylinder 30, a start valve 6 that operates the main valve 5, and a trigger 60 that operates the start valve 6.

[0016] Furthermore, the screw driver 1A includes an on-off valve 7 that switches the operation of the air motor 31 on or off, and a control unit 70 that operates the on-off valve 7. The screw driver 1A also includes a contact arm 8 that contacts the material to be driven 300, is configured to move axially along the direction of screw driving 200, and operates the start valve 6 in cooperation with the operation of the trigger 60, as well as operating the control unit 70.

[0017] Furthermore, the screw driving machine 1A includes a screw feeding unit 9 that feeds the screw connector 203 to the nose unit 12, which will be described later, and a magazine 90 that houses the screw connector 203 fed by the screw feeding unit 9.

[0018] The screw driver 1A comprises a main body 10 and a handle 11 extending in a direction intersecting the main body 10. The screw driver 1A has a nose 12 through which the driver bit 2 passes, and on one side of the main body 10 that extends along the axial direction of the driver bit 2, a screw 200 connected by a connecting band 201 is supplied by a screw feed unit 9. The screw driver 1A has one side of the main body 10 along the extension direction on which the nose 12 is provided as the lower side, and the other side of the main body 10 along the extension direction as the upper side. The screw driver 1A has a magazine 90 located below the handle 11.

[0019] The nose section 12 includes an injection passage 12a into which screws 200 connected by a connecting band 201 are supplied, and an injection port 12b formed at one end along the extending direction of the injection passage 12a indicated by arrow A, from which screws 200 detached from the connecting band 201 are injected.

[0020] The screw driving machine 1A includes a main chamber 13 to which compressed air is supplied from an external air compressor (not shown). The main chamber 13 is located inside the handle section 11 and around the outer circumference of the striking cylinder 30 connected to the handle section 11 within the main body section 10, and is supplied with compressed air that has been depressurized by a pressure reducing valve 13a. The screw driving machine 1A also includes an exhaust pipe 14 for exhausting the compressed air supplied to the striking cylinder 30 and the air motor 31, etc. The exhaust pipe 14 is located in the handle section 11 and exhausts the compressed air through an exhaust filter 14a.

[0021] The striking cylinder 30 extends vertically and is installed inside the main body 10. A striking piston 30a is slidably mounted within the cylindrical internal space of the striking cylinder 30. The striking piston 30a has a seal portion 30b on its outer circumference and is housed within the striking cylinder 30. The striking piston 30a divides the inside of the striking cylinder 30 into a first chamber 30c and a second chamber 30d. A motor shaft 31a, driven by an air motor 31, is attached to the striking piston 30a. When the striking piston 30a is in the top dead center position, a driver bit 2 is connected to the first chamber 30c side. That is, the driver bit 2 protrudes downward from the striking piston 30a and is detachably attached to the striking piston 30a via the motor shaft 31a. The motor shaft 31a is located on the opposite side of the driver bit 2 from the striking piston 30a and is attached to the striking piston 30a in a manner that protrudes upward from the striking piston 30a.

[0022] The striking cylinder 30 is supplied with compressed air from the main chamber 13 to the second chamber 30d. The striking piston 30a is pressed by the air pressure of the compressed air supplied to the second chamber 30d of the striking cylinder 30 and moves downward as indicated by arrow D, moving the driver bit 2 downward along the axial direction. The driver bit 2 and the motor shaft 31a move together with the striking piston 30a. As the driver bit 2 moves downward, it is guided by the nose portion 12 and drives the screw 200 supplied from the magazine 90 to the nose portion 12 into the material to be driven 300. The driver bit 2 also rotates together with the motor shaft 31a as the motor shaft 31a rotates, driving the driver bit 2 into the material to be driven 300.

[0023] The screw driving machine 1A includes a timer chamber 32 to which compressed air is supplied to operate the control unit 70, and a blowback chamber 33 to which compressed air is supplied to return the striking piston 30a, which has moved to the bottom dead center position, to the top dead center position, and to operate the screw feeding unit 9.

[0024] The timer chamber 32 and the blowback chamber 33 are located inside the main body 10 on the outer circumference of the striking cylinder 30. The timer chamber 32 is electrically connected to the space inside the striking cylinder 30 via a side hole passage 32a of the striking cylinder 30. The blowback chamber 33 is electrically connected to the space inside the striking cylinder 30 via a side hole passage 33a of the striking cylinder 30. Compressed air is supplied to the timer chamber 32 and the blowback chamber 33 as the striking piston 30a moves from the top dead center position to the bottom dead center position, and the pressure increases according to the position of the striking piston 30a.

[0025] The air motor 31 comprises a rotor 31b1 that rotates the motor shaft 31a, a blade 31b2 that receives the airflow that rotates the rotor 31b1, and a motor housing 31c that rotatably supports the rotor 31b1 and generates the airflow that rotates the rotor 31b1. The rotation of the rotor 31b1 is transmitted to the motor shaft 31a via a reduction gear 31d. The reduction gear 31d is provided between the striking cylinder 30 and the air motor 31. The reduction gear 31d consists of a planetary gear mechanism and comprises a sun gear 31e connected to the rotor 31b1, a plurality of planetary gears 31f that mesh with the sun gear 31e, an internal gear 31g that meshes with the planetary gears 31f, and a carrier 31h that rotatably supports the planetary gears 31f. In the reduction gear 31d, the sun gear 31e, the planetary gears 31f, and the internal gear 31g are provided on the same plane with respect to the axial direction of the driver bit 2. Furthermore, the reduction gear 31d has a carrier 31h provided below the sun gear 31e, planetary gear 31f, and internal gear 31g.

[0026] The rotor 31b1 has a hollow structure with a hole 31b3 extending from its upper end to its lower end in the axial direction along the upward direction indicated by arrow U and the downward direction indicated by arrow D, and the motor shaft 31a is inserted into the hole 31b3 so as to be movable in the axial direction. The hole 31b3 is located coaxially with the center of rotation of the rotor 31b1. The rotor 31b1 has an engagement point at its lower end that connects to the sun gear 31e. The engagement point that connects to the sun gear 31e is composed of a polygonal, for example, hexagonal shaft, and the engagement point that connects to the rotor 31b1 is composed of a polygonal, for example, hexagonal hole. The internal gear 31g has teeth formed on the inner circumferential surface of an annular member and is fixed concentrically with the sun gear 31e so as not to rotate. The planetary gear 31f is rotatably supported by the carrier 31h and is positioned between the sun gear 31e and the internal gear 31g, meshing with both the sun gear 31e and the internal gear 31g. As a result, when the rotor 31b1 rotates, causing the sun gear 31e to rotate, the planetary gear 31f rotates while the carrier 31h rotates at a predetermined reduction ratio.

[0027] The carrier 31h is equipped with a plurality of gear rollers 31i that support the motor shaft 31a so as to be movable in the axial direction. The gear rollers 31i are rotatably supported by the carrier 31h in an arrangement where their outer surfaces are located on the sides of a polygon, for example, a triangle, surrounding the center of rotation of the carrier 31h. The motor shaft 31a has flat surfaces at the points where it contacts the gear rollers 31i, and three flat surfaces are provided to match the arrangement of the gear rollers 31i. As a result, the motor shaft 31a is supported at the center of rotation of the carrier 31h by the plurality of gear rollers 31i, and is movable in the axial direction as the gear rollers 31i rotate. Therefore, when the striking piston 30a moves downward due to the air pressure of compressed air in the striking cylinder 30, the motor shaft 31a moves downward together with the striking piston 30a and the driver bit 2.

[0028] Furthermore, the motor shaft 31a rotates together with the carrier 31h because the flat surface of the motor shaft 31a is in contact with the gear roller 31i. Therefore, when the rotor 31b1 of the air motor 31 rotates due to the air pressure of the compressed air, the motor shaft 31a rotates together with the carrier 31h which rotates at a predetermined reduction ratio.

[0029] The air motor 31 is located on the upper side of the main body 10. The motor shaft 31a of the air motor 31 is located coaxially with the driver bit 2. As a result, the air motor 31 is located on the side of the second chamber 30d relative to the striking cylinder 30, that is, on the side opposite to the lower side of the main body 10 where the nose portion 12 is located, and is located coaxially with the striking cylinder 30, above the striking cylinder 30, along the axial direction of the driver bit 2. Furthermore, the air motor 31 is configured such that the motor shaft 31a is inserted into a hole 31b3 provided in the rotor 31b1, and the air motor 31 is located above the striking cylinder 30, ensuring space for the motor shaft 31a to operate in the vertical direction.

[0030] The main valve 5 is mounted on the outer circumference of the striking cylinder 30 so as to be movable up and down. The main valve 5 is also biased downward by the main valve spring 51, in the direction that closes the air passage 54. Furthermore, the main valve 5 is pushed downward by the air pressure of the compressed air supplied from the main chamber 13 via the start valve 6 to the main valve upper chamber 52 where the main valve spring 51 is located. The main valve 5 is also pushed downward by the air pressure of the compressed air supplied from the main chamber 13 to the main valve lower chamber 53.

[0031] As a result, the main valve 5 opens and closes the air passage 54 connecting the main chamber 13, the striking cylinder 30, and the air motor 31. The air passage 54 is located between the striking cylinder 30 and the main valve 5, on the outer circumference side of the striking cylinder 30 and on the inner circumference side of the main valve 5, and is connected to the main valve lower chamber 53 via the main valve 5. When not in operation, the main valve 5 is biased downward and in the bottom dead center position due to the balance between the air pressure of the compressed air supplied to the main valve upper chamber 52 and the air pressure of the compressed air supplied to the main valve lower chamber 53, and the force of the main valve spring 51, thus blocking the air passage 54 between the main valve lower chamber 53 and the striking cylinder 30. In contrast, when in operation, the main valve 5 is pushed upward by the air pressure of the compressed air supplied from the main chamber 13 to the main valve lower chamber 53 as the main valve upper chamber 52 communicates with the atmosphere via the start valve 6, opening the air passage 54 between the main valve lower chamber 53 and the striking cylinder 30.

[0032] The starting valve 6 includes a pilot valve 61 that opens and closes the main valve upper chamber 52, a valve stem 62 that actsuates the pilot valve 61, and a valve stem spring 63 that biases the pilot valve 61 upward and the valve stem 62 downward.

[0033] The starting valve 6 is pushed downward by the air pressure of the compressed air supplied from the main chamber 13, and the pilot valve 61 is pushed upward by the air pressure of the compressed air supplied from the main chamber 13 to the valve lower chamber 64.

[0034] As a result, the pilot valve 61 is held in the upper position due to the balance of compressed air pressure and the force of the valve stem spring 63. Conversely, when the valve stem 62 of the starting valve 6 moves upward, the lower valve chamber 64 communicates with the atmosphere, causing the pilot valve 61 to move downward due to the compressed air pressure. As the pilot valve 61 moves downward, a passage opens that connects the upper main valve chamber 52 to the atmosphere.

[0035] The trigger 60 is located on the underside of the handle 11 and rotates around 60c as a pivot point in response to operator input. The trigger 60 is biased by the trigger spring 60d to move away from the valve stem 62 of the start valve 6.

[0036] The trigger 60 includes a contact lever 60a that acts on the valve stem 62 of the starting valve 6. The contact lever 60a is supported by the trigger 60 so as to be rotatable around a pivot point of shaft 60b. The contact lever 60a does not contact the valve stem 62 when the trigger 60 is pulled. However, when the trigger 60 is pulled and the contact lever 60a is pushed by an upper arm (not shown) of the contact arm 8, it moves the valve stem 62 upward. Thus, the starting valve 6 is operated by a combination of the operation of the trigger 60 and the operation of pushing the contact arm 8.

[0037] The contact arm 8 comprises a lower arm 80 that contacts the material to be driven 300 and an upper arm (not shown) that actsuates the contact lever 60a of the trigger 60. The lower arm 80 is supported by the nose portion 12 so as to be movable in the vertical direction and is biased downward by a biasing member (not shown).

[0038] The screw driving machine 1A includes a tightening depth adjustment unit 86 that defines the upper pivot position of the lower arm 80 and activates a first control valve 72 when the lower arm 80 moves to the upper pivot position.

[0039] The tightening depth adjustment section 86 comprises an adjustment section body 86a and a stopper section 86b whose protrusion height relative to the adjustment section body 86a can be adjusted. The tightening depth adjustment section 86 is supported so as to be movable along the direction of movement of the lower arm 80 indicated by arrows U and D, and is biased downward in the direction indicated by arrow U by a biasing member 86c such as a coil spring.

[0040] The tightening depth adjustment section 86 has a configuration in which the adjustment section body 86a and the abutment section 86b are joined together, for example, by screwing a male screw and a female screw into each other. The tightening depth adjustment section 86 has a dial section 86d for rotating the adjustment section body 86a that is exposed to the outside of the main body 10, and by rotating the adjustment section body 86a by operating the dial section 86d, the amount of protrusion of the abutment section 86b relative to the adjustment section body 86a is switched, and the overall length of the tightening depth adjustment section 86 is changed.

[0041] In the tightening depth adjustment section 86, the abutment portion 86b faces the lower arm 80. When the lower arm 80 is at its bottom dead center position, the abutment portion 86b and the lower arm 80 are separated. In the tightening depth adjustment section 86, the lower arm 80 comes into contact with the abutment portion 86b when the lower arm 80 moves upward from its bottom dead center position in the direction indicated by arrow U.

[0042] Then, the tightening depth adjustment section 86 is pushed up by the lower arm 80 which moves in the direction of arrow U, and when the adjustment section body 86a moves to a position where it is in contact with the movement restricting section 86e, the lower arm 80 restricts further movement in the direction of arrow U.

[0043] As a result, the tightening depth adjustment section 86 moves to a position where it contacts the movement restricting section 86e, and the restricted position of the lower arm 80 becomes the upper pivot position of the lower arm 80.

[0044] Furthermore, the amount of protrusion of the abutment portion 86b relative to the adjustment portion body 86a is switched by operating the dial portion 86d of the tightening depth adjustment portion 86, thereby changing the overall length of the tightening depth adjustment portion 86. When the overall length of the tightening depth adjustment portion 86 changes, the top dead center position of the lower arm 80 moves. When the top dead center position of the lower arm 80 moves, the amount of protrusion of the driver bit 2, which has moved to the bottom dead center position relative to the lower end surface of the lower arm 80, changes, and the tightening depth of the screw 200 relative to the material 300 to be driven changes.

[0045] The on-off valve 7 is supported so as to be vertically movable by an on-off valve cylinder 73 provided in the motor housing 31c. The on-off valve cylinder 73 has an on-off valve lower chamber 73a below the on-off valve 7 indicated by arrow D, and an on-off valve upper chamber 73b above the on-off valve 7 indicated by arrow U. The on-off valve 7 is operated by compressed air supplied from the main chamber 13, and when compressed air is not supplied to the on-off valve upper chamber 73b, it moves upward indicated by arrow U with the compressed air supplied to the on-off valve lower chamber 73a. When compressed air is supplied to the on-off valve upper chamber 73b, it moves downward indicated by arrow D.

[0046] The on-off valve 7 opens and closes the air passage 74 connected to the air motor 31 by moving vertically. The air passage 74 is in electrical contact with the air passage 54 downstream of the main valve 5. When the on-off valve 7 moves downward and closes the air passage 74, the airflow between the main chamber 13 and the air motor 31 is blocked. When the on-off valve 7 moves upward and opens the air passage 74, electrical contact is restored between the main chamber 13 and the air motor 31. The on-off valve 7 is located on the side of the air motor 31.

[0047] The control unit 70 includes a control valve cylinder 75, a first control valve 72 housed in the control valve cylinder 75 and dividing the inside of the control valve cylinder 75 into a third chamber 75a and a fourth chamber 75b, a communication passage 75c that connects the inside of the striking cylinder 30 and the third chamber 75a inside the control valve cylinder 75 via a timer chamber 32, and a second control valve 71 located on the side of the first control valve 72 in the direction of arrow U and spaced apart from the first control valve 72.

[0048] Furthermore, the control unit 70 includes a first biasing member 72b, which is a first biasing unit that biases the first control valve 72 in the direction of arrow D, and a second biasing member 71a, which is a second biasing unit that biases the second control valve 71 in the direction of arrow D.

[0049] The control valve cylinder 75 has a third chamber 75a located below the first control valve 72 indicated by arrow D, and a fourth chamber 75b located above the first control valve 72 indicated by arrow U. The third chamber 75a of the control valve cylinder 75 is electrically connected to the timer chamber 32 via a communication passage 75c, and is electrically connected to the space inside the striking cylinder 30 via the timer chamber 32. In addition, the third chamber 75a of the control valve cylinder 75 is electrically connected to the outside of the screw driving machine 1A via an exhaust passage 75d.

[0050] The first control valve 72 is supported by the control valve cylinder 75 so as to be able to move up and down along the upward direction indicated by arrow U and the downward direction indicated by arrow D. The first control valve 72 is connected to a rod-shaped connecting portion 72a that extends in the vertical direction and protrudes upward as indicated by arrow U. Furthermore, the first control valve 72 is biased in the direction of arrow D by a first biasing member 72b such as a coil spring. The first control valve 72 faces the adjustment body 86a of the tightening depth adjustment portion 86.

[0051] The first control valve 72 is configured to move to the standby position P100, which is the bottom dead center position, by moving downward in the direction indicated by arrow D, and to move to the operation end position, which is the top dead center position, which will be described later, by moving upward in the direction indicated by arrow U.

[0052] The first control valve 72 is biased in the direction of arrow D by the first biasing member 72b, causing it to move to the standby position P100.

[0053] The first control valve 72 is equipped with a seal portion 72c that opens and closes the exhaust passage 75d. When the first control valve 72 is in standby position P100, the seal portion 72c is in a position to open the exhaust passage 75d, and the third chamber 75a of the control valve cylinder 75 is in electrical contact with the outside of the screw driving machine 1A via the exhaust passage 75d. In the process of moving from standby position P100 to the operation end position, when the first control valve 72 moves to the pressure control start position, which will be described later, between standby position P100 and the operation end position, the seal portion 72c moves to a position to close the exhaust passage 75d.

[0054] The first control valve 72, which is waiting in standby position P100, is activated by being pushed by the lower arm 80 via the tightening depth adjustment part 86, and moves from standby position P100 to pressure control start position. When the first control valve 72 moves to the pressure control start position, it is activated by compressed air supplied from the timer chamber 32 and moves from the pressure control start position to the operation end position. In the process of moving from the pressure control start position to the operation end position, the first control valve 72 pushes the second control valve 71 via the connecting part 72a, and activates the second control valve 71.

[0055] The second control valve 71 is composed of a rod-shaped member that extends vertically and is supported so as to be vertically movable relative to the on-off valve 7. The second control valve 71 is biased in the direction of arrow D by the second biasing member 71a and moves to the standby position P110. The second control valve 71 is also operated by being pushed by the first control valve 72. The second control valve 71 moves from the standby position P110 to the operation completion position described later and operates the on-off valve 7 by switching the supply of compressed air to the on-off valve upper chamber 73b of the on-off valve cylinder 73.

[0056] The control unit 70 includes an adjustment member 71b for adjusting the biasing force of the second biasing member 71a. The adjustment member 71b constitutes an adjustment section, for example, by having a screw formed on its outer circumference, and by adjusting the amount the screw is tightened, the length of the second biasing member 71a in the extension and retraction direction is adjusted.

[0057] The screw feeding unit 9 includes a feeding member 91 that feeds the screw connector 203 and a feed piston 92 that operates the feeding member 91. The feeding member 91 is supported so as to be movable in directions toward and away from the injection passage 12a of the nose section 12, and engages with the connecting band 201 to feed the screw 200 connected by the connecting band 201 into the injection passage 12a.

[0058] The feed piston 92 is connected to the feed member 91 and is slidably mounted within the feed cylinder 93. The feed cylinder 93 is connected to the blowback chamber 33 via the feed passage 94, and compressed air is supplied from the blowback chamber 33.

[0059] The feed piston 92 is operated by the air pressure of compressed air supplied from the blowback chamber 33, moving the feed member 91 away from the injection passage 12a. The feed piston 92 is also biased by a biasing member 95, such as a coil spring, to move the feed member 91 toward the injection passage 12a. When the air pressure in the feed cylinder 93 decreases, the biasing member 95 moves the feed member 91 toward the injection passage 12a.

[0060] Magazine 90 is This is the direction that intersects with the injection passage 12a, that is, the direction opposite to the first direction indicated by arrow B that intersects with the extension direction of the injection passage 12a. It is located on the underside of the handle section 11 and is connected to the nose section 12. The magazine 90 houses the screw connector 203 shown in Figure 5.

[0061] The screw driving machine 1A includes a supply passage 96a that connects the injection passage 12a and the magazine 90, and through which the screw connector 203 is fed along a first direction indicated by arrow B that intersects the extension direction of the injection passage 12a.

[0062] The supply passage 96a is composed of a part of the components that make up the magazine 90 and a part of the components that make up the nose portion 12, and extends along the first direction indicated by arrow B between the injection passage 12a and the space inside the magazine 90 in which the spirally wound screw connector 203 is housed.

[0063] Furthermore, the screw driving machine 1A has an outlet 12c that connects the injection passage 12a to the outside of the nose section 12, and through which the connecting band 201 from which the screw 200 has been injected is discharged along the first direction indicated by arrow B.

[0064] The discharge port 12c is located in the nose portion 12 on the extension of the supply passage 96a, on the opposite side of the supply passage 96a via the injection passage 12a, and is configured by providing an opening of a size that allows the connecting band 201 to pass through a part of the surface facing the first direction indicated by arrow B.

[0065] The screw driving machine 1A has openings on the sides of the magazine 90, the supply passage 96a, the injection passage 12a, and the discharge port 12c, which are oriented in the direction of extension of the injection passage 12a indicated by arrow A and in the second direction indicated by arrow C, which intersects with the first direction indicated by arrow B.

[0066] The screw driver 1A includes a magazine cap portion 97 that, in a direction intersecting with the injection passage 12a, has a tip portion on the injection passage 12a side and a base portion opposite to the tip portion, and the tip portion rotates in a direction toward and toward the magazine 90 with the base portion as a pivot point, thereby opening and closing the magazine 90. The magazine cap portion 97 covers a part of the side of the open magazine 90 and a part of the side of the supply passage 96a in an openable and closable manner. The screw driver 1A also includes a door portion 98 that is integrally connected to the magazine cap portion 97 and covers a part of the side of the open injection passage 12a, a part of the side of the discharge port 12c and a part of the side of the supply passage 96a in an openable and closable manner.

[0067] The magazine cap portion 97 is an example of a lid portion, and has a convex shape that can cover the spirally wound screw connector 203, extending toward the side where the nose portion 12 is provided to cover a part of the supply passage 96b. The magazine cap portion 97 is supported by the magazine 90 via a support shaft 97a at the end opposite to the side to which the door portion 98 is connected, and rotates relative to the magazine 90 with the support shaft 97a as a pivot point. The magazine cap portion 97 is biased in the opening direction relative to the magazine 90 by a biasing member, such as a torsion coil spring (not shown), inserted into the support shaft 97a. The magazine cap portion 97 may also be configured not to be biased in the opening direction relative to the magazine 90 by a biasing member.

[0068] The door portion 98 is an example of a lid portion, supported by the magazine cap portion 97 via a connecting shaft 98a, and rotates relative to the magazine cap portion 97 with the connecting shaft 98a as a pivot point. The axial direction of the connecting shaft 98a is intersecting the first direction indicated by arrow B. The support shaft 97a that supports the magazine cap portion 97 on the magazine 90 and the connecting shaft 98a that supports the door portion 98 on the magazine cap portion 97 are parallel in their axial directions.

[0069] The magazine cap portion 97 and the door portion 98 change between a linearly extended form and a bent form through relative rotation with the connecting shaft 98a as the pivot point. The door portion 98 has a biasing member 98b, such as a torsion coil spring as an example of a biasing part, inserted into the connecting shaft 98a, and is biased in the direction in which the magazine cap portion 97 and the door portion 98 bend.

[0070] Furthermore, the magazine cap portion 97 and the door portion 98 rotate together with the support shaft 97a as the pivot point, opening and closing the sides of the magazine 90, the supply passage 96a, the ejection passage 12a, and the discharge port 12c.

[0071] When the magazine cap portion 97 and door portion 98 of the screw gun 1A are opened, the sides of the magazine 90, the supply passage 96a, the injection passage 12a, and the discharge port 12c are exposed. The sides of the magazine 90, the supply passage 96a, the injection passage 12a, and the discharge port 12c are open in a manner that connects them along the first direction indicated by arrow B. The screw gun 1A is also provided with openings 12d on the sides of the injection passage 12a and the discharge port 12c. The openings 12d are configured to connect the opening on the side of the injection passage 12a and the opening on the side of the discharge port 12c along the first direction indicated by arrow B. When the magazine cap portion 97 and door portion 98 of the screw gun 1A are opened, the openings 12d are exposed. The door section 98 exposes the opening 12d when the discharge port 12c is open.

[0072] Furthermore, when the magazine cap portion 97 and door portion 98 of the screw gun 1A are closed, they cover the openings on the sides of the magazine 90, the supply passage 96a, the ejection passage 12a, and the discharge port 12c. The door portion 98 covers the opening 12d when the discharge port 12c is open.

[0073] The screw gun 1A includes a plurality of engaging parts that hold the magazine cap portion 97 and the door portion 98 in a closed state with the magazine 90 closed. In this example, it includes a first engaging part 99a and a second engaging part 99b that hold the magazine cap portion 97 and the door portion 98 in a closed state. The first engaging part 99a is provided on the side of the door portion 98 that is close to the connecting shaft 98a connected to the magazine cap portion 97. The first engaging part 99a includes an engaging projection 99a2 that enters into an engaging recess 99a1 provided on the main body portion 10, an operating part 99a3 that receives an operation to insert and remove the engaging projection 99a2 from the engaging recess 99a1, and a biasing member 99a4 such as a coil spring as an example of a biasing part that biases the first engaging part 99a in the direction that the engaging projection 99a2 enters the engaging recess 99a1. The first engaging portion 99a is biased by the biasing member 99a4 so that the engaging projection 99a2 enters the engaged recess 99a1 and engages with the main body 10 to hold the door portion 98 and magazine cap portion 97 in a closed state, and is displaced between a holding position and a release position where the engaging projection 99a2 disengages from the engaged recess 99a1 when the operating portion 99a3 is operated, releasing the engagement with the main body 10 and allowing the door portion 98 and magazine cap portion 97 to be opened and closed.

[0074] The second engaging portion 99b is an example of an engaging portion and is provided on the nose portion 12. The second engaging portion 99b is provided on both sides of the discharge port 12c along the extending direction of the injection passage 12a indicated by arrow A. That is, the second engaging portion 99b is provided opposite to the door portion 98, which is in a closed state, along the extending direction of the injection passage 12a indicated by arrow A. The second engaging portion 99b is also provided in the vicinity of the injection passage 12a. The second engaging portion 99b is provided on the side of the door portion 98, which is in a closed state, that is closer to the nose portion 12 than the position H1 of the part that protrudes the most in the second direction indicated by arrow C. The provision of the second engaging portion 99b in such a position is referred to as the second engaging portion 99b being provided in the vicinity of the injection passage 12a.

[0075] The door section 98 is At its tip 98c,The second engaging portion 99b has an engaging projection 99c that can engage with the second engaging portion 99b. The second engaging portion 99b also has an engaging recess 99d into which the engaging projection 99c engages. The engaging projection 99c is an example of a projection, and is provided on both sides of the door portion 98 along the extending direction of the injection passage 12a indicated by arrow A, and is cylindrical in shape that protrudes from the door portion 98 along the axial direction of the support shaft 97a and the connecting shaft 98a.

[0076] The engaging recess 99d is an example of a recess, extending along the first direction indicated by arrow B, and is composed of a groove shaped to accommodate the engaging projection 99c. The engaging recess 99d is open on the side opposite to the first direction, towards the magazine 90, allowing the engaging projection 99c to be inserted and removed. The second engaging portion 99b is provided with a guide portion 99e connected to the engaging recess 99d on the side of the engaging recess 99d closer to the nose portion 12. The guide portion 99e is an extension of the surface of the engaging recess 99d on the side closer to the nose portion 12, and extends along the first direction. The second engaging portion 99b is also provided with an introduction portion 99f on the side of the engaging recess 99d farther from the nose portion 12. The introduction portion 99f is the end of the engaging recess 99d farther from the nose portion 12, and is formed in a position that is recessed further in the first direction than the guide portion 99e.

[0077] The magazine cap portion 97 and the door portion 98 change between a linearly extended form and a bent form through relative rotation with the connecting shaft 98a as the pivot point, thereby changing the distance from the support shaft 97a to the engaging projection 99c.

[0078] The length from the support shaft 97a to the guide portion 99e is configured to be longer than the distance from the support shaft 97a to the engaging projection 99c when the magazine cap portion 97 and the door portion 98 are bent into a shape formed by relative rotation around the connecting shaft 98a. As a result, when the magazine cap portion 97 and the door portion 98 are bent into a shape formed by relative rotation, the guide portion 99e is located on the rotational trajectory of the engaging projection 99c centered on the support shaft 97a. Furthermore, the length from the support shaft 97a to the introduction portion 99f is configured to be shorter than the distance from the support shaft 97a to the engaging projection 99c when the magazine cap portion 97 and the door portion 98 are bent into a shape formed by relative rotation around the connecting shaft 98a. As a result, when the magazine cap portion 97 and the door portion 98 are bent into a shape formed by relative rotation, the introduction portion 99f is located outside the rotational trajectory of the engaging projection 99c centered on the support shaft 97a. Furthermore, the length from the support shaft 97a to the guide portion 99e is set to be shorter than the distance from the support shaft 97a to the engaging projection 99c when the magazine cap portion 97 and the door portion 98 are changed to a linearly extended form by relative rotation around the connecting shaft 98a as a pivot point. As a result, when the magazine cap portion 97 and the door portion 98 are changed to a bent form by relative rotation around the connecting shaft 98a as a pivot point, the engaging projection 99c does not come into contact with the introduction portion 99f even when the magazine cap portion 97 and the door portion 98 rotate around the support shaft 97a as a pivot point. The engaging projection 99c then comes into contact with the guide portion 99e. Note that the magazine cap portion 97 and the door portion 98 may not be connected in a movable form via the connecting shaft 98a, but may be configured as a fixed, integrated lid portion. In such a lid portion, the side opposite to the side where the part corresponding to the door portion is provided is supported so that it can be opened and closed by rotational movement around the support shaft as a pivot point relative to the magazine 90.

[0079] The screw gun 1A is equipped with a screw detection unit 210 that detects the presence or absence of a screw 200 (screw connector 203). The screw detection unit 210 is an example of a consumable detection unit and is supported by the magazine cap 97 via a shaft 210a. The screw detection unit 210 is equipped with a detector 210b provided on one side of the shaft 210a and in contact with the screw connector 203 passing through the supply passage 96a. The screw detection unit 210 is also equipped with a confirmation unit 210c provided on the other side of the shaft 210a and capable of protruding outward from a window 97b provided in the magazine cap 97 and retracting inward from the magazine cap 97. Furthermore, the screw detection unit 210 is equipped with a biasing member 210d, such as a coil spring, that biases the detector 210b toward the supply passage 96a.

[0080] When the screw connector 203 is housed in the magazine 90 and the portion that has been pulled out from its spiral-shaped state is passed through the supply passage 96a, and the magazine cap portion 97 and door portion 98 are closed, the screw detection unit 210 detects the screw connector 203 and presses against it. As a result, the screw detection unit 210 rotates on its shaft 210a as a pivot point, and the confirmation portion 210c retracts into the inside of the magazine cap portion 97 through the window portion 97b of the magazine cap portion 97.

[0081] <Example of magazine opening and closing operation> Figure 6A is a cross-sectional view showing an example of the opening and closing operation of the magazine cap and door sections, and Figure 6B is a perspective view showing an example of the opening and closing operation of the magazine cap and door sections. Next, an example of the opening and closing operation of the magazine cap section 97 and door section 98 will be explained.

[0082] As shown in Figures 1A and 1B, when the magazine 90 is opened, the magazine cap portion 97 and the door portion 98 change to a bent shape due to relative rotation around the connecting shaft 98a as the pivot point. From this state, when the magazine cap portion 97 and the door portion 98 are rotated in the closing direction around the support shaft 97a as the pivot point, the engaging projection 99c of the door portion 98 does not contact the introduction portion 99f on the nose portion 12 side. Then, the engaging projection 99c comes into contact with the guide portion 99e, and as shown in Figures 6A and 6B, the engaging projection 99c of the door portion 98 moves to a position opposite the engaging recess 99d on the nose portion 12 side.

[0083] From this state, when the area near the point where the magazine cap portion 97 and the door portion 98 are connected by the connecting shaft 98a is pressed in a direction that causes the magazine cap portion 97 and the door portion 98 to extend in a straight line, the engaging projection 99c of the door portion 98 moves along the guide portion 99e on the nose portion 12 side. As a result, the engaging projection 99c is guided by the guide portion 99e into the engaging recess 99d and moves further along the engaging recess 99d. The engaging recess 99d causes the door portion 98, which is bent relative to the magazine cap portion 97 with the connecting shaft 98a as a pivot point when the magazine cap portion 97 and the door portion 98 are closed, to extend in a straight line against the biasing force of the biasing member 98b. Then, when the magazine cap portion 97 and the door portion 98 are in the open state, the first engaging portion 99a moves to a holding position that engages with the main body portion 10 and holds the door portion 98 and the magazine cap portion 97 in the closed state.

[0084] As a result, when the magazine cap portion 97 and the door portion 98 are in the closed position, the magazine cap portion 97 and the door portion 98 are in a linearly extended form, and the side of the door portion 98 closer to the connecting shaft 98a connected to the magazine cap portion 97 is held in the closed position by the first engaging portion 99a. Also, the side of the door portion 98 opposite to the connecting shaft 98a connected to the magazine cap portion 97, closer to the nose portion 12 The tip portion 98c However, the engagement projection 99c and the engagement recess 99d engage with each other, and the second engagement portion 99b holds it in a closed state.

[0085] To open the magazine cap portion 97 and the door portion 98, the first engaging portion 99a is moved to a release position that disengages it from the main body portion 10, allowing the door portion 98 and the magazine cap portion 97 to be opened and closed. When the holding in the closed state by the first engaging portion 99a is released, the magazine cap portion 97 and the door portion 98 change into a bent shape due to the biasing force of a biasing member (not shown), with the connecting shaft 98a as the pivot point.

[0086] When the magazine cap portion 97 and the door portion 98 change from a closed state to a bent state, the engaging projection 99c of the door portion 98 moves to the outside of the introduction portion 99f and is guided by the guide portion 99e to a position where it disengages from the engaging recess 99d on the nose portion 12 side. This allows the magazine cap portion 97 and the door portion 98 to be opened by a rotational movement with the support shaft 97a as the pivot point.

[0087] <Example of operation of the screw driving machine according to this embodiment> Figure 7 is a side cross-sectional view of a screw gun showing an example of the operation of driving a screw into a workpiece and tightening it. Figures 8A, 8B, 8C, 8D, 8E, 8F, and 8G are front cross-sectional views of a screw gun showing an example of the operation of driving a screw into a workpiece and tightening it. Figure 9 is a bottom cross-sectional view of a screw gun showing an example of the state in which screws in the magazine have been used.

[0088] Next, we will describe an example of the operation of the screw driving machine 1A, which drives and tightens screws 200.

[0089] The screw driver 1A is operated by an operator who holds the handle 11 and presses the contact arm 8 against the material to be driven into 300. When the contact arm 8 is pressed against the material to be driven into 300, the lower arm 80 moves upward in relation to the main body 10.

[0090] As a result of the movement of the contact arm 8, which moves upward as a lower arm 80 moves relative to the main body 10, the upper arm of the contact arm 8 (not shown) moves to a position that activates the contact lever 60a of the trigger 60. Thus, when the trigger 60 is pulled, as shown in Figure 7, the contact lever 60a pushes the valve stem 62 of the start valve 6, and the start valve 6 is activated.

[0091] When the start valve 6 is activated, the main valve 5 is activated as shown in Figure 8B, and compressed air is supplied to the striking cylinder 30 and the on-off valve 7. When compressed air is supplied to the striking cylinder 30, the striking piston 30a to which the driver bit 2 is attached is pushed by the air pressure, and as shown in Figure 8C, the driver bit 2 (striking piston 30a) moves downward from the top dead center position to the bottom dead center position, and the screw 200 is driven into the material to be driven 300.

[0092] When the driver bit 2 (striking piston 30a) moves downward from the top dead center position, air from below the striking piston 30a is supplied to the blowback chamber 33, and the pressure inside the blowback chamber 33 increases.

[0093] When the driver bit 2 (impact piston 30a) moves to the bottom dead center position, compressed air in the blowback chamber 33 is supplied to the feed piston 92 from the feed passage 94 of the screw feeding unit 9. This causes the feed member 91 to move away from the injection passage 12a. In the movement of the feed member 91 away from the injection passage 12a, the feed member 91 detaches from the connecting band 201, and the screw connector 203 is not fed.

[0094] Furthermore, when the main valve 5 is activated and compressed air is supplied to the lower chamber 73a of the valve cylinder 73, which is the space below the valve 7, the valve 7 is activated by air pressure, as shown in Figure 8C, and compressed air is supplied to the air motor 31.

[0095] When compressed air is supplied to the air motor 31, the driver bit 2 rotates, and the screw 200 driven into the material 300 is tightened, as shown in Figure 8D. In addition, the main body 10 moves further downward in accordance with the tightening of the screw 200 as the contact arm 8 is pressed against the material 300.

[0096] As the contact arm 8 is pressed against the material to be driven 300, the main body 10 moves further downward in accordance with the tightening of the screw 200, and the lower arm 80 moves relatively upward. When the lower arm 80 moves relatively upward, it pushes the tightening depth adjustment section 86 upward. The lower arm 80 moving in the direction of arrow U pushes up the tightening depth adjustment section 86, and when the tightening depth adjustment section 86 moves to a position where it contacts the movement restricting section 86e, the lower arm 80 is restricted from moving further upward. As a result, the position of the lower arm 80 that is restricted by the tightening depth adjustment section 86 moving to a position where it contacts the movement restricting section 86e becomes the upper pivot point position of the lower arm 80. When the lower arm 80 moves to the top dead center position, as shown in Figure 8E, the lower arm 80 pushes the first control valve 72 upward via the tightening depth adjustment unit 86, causing the first control valve 72 to move from the standby position P100 shown in Figure 8A, etc., to the pressure control start position P101.

[0097] The control valve cylinder 75 has a third chamber 75a that is always in electrical contact with the space inside the striking cylinder 30 via a communication passage 75c and a side hole passage 32a of the striking cylinder 30. When the main valve 5 is activated and the seal portion 30b of the striking piston 30a passes through the side hole passage 32a, compressed air is supplied to the timer chamber 32 from the second chamber 30d inside the striking cylinder 30, which is the upper chamber of the striking cylinder. From the time the first control valve 72 is in standby position P100 until it moves to the pressure control start position P101, the seal portion 72c of the first control valve 72 is in a position to open the exhaust passage 75d, and the third chamber 75a of the control valve cylinder 75 is in electrical contact with the outside of the screw driving machine 1A via the exhaust passage 75d. As a result, even when compressed air is supplied from the timer chamber 32 to the third chamber 75a of the control valve cylinder 75, the third chamber 75a is kept at atmospheric pressure, and the first control valve 72 does not operate under air pressure.

[0098] When the first control valve 72 moves to the pressure control start position P101, the seal portion 72c of the first control valve 72 closes the exhaust passage 75d. When the air passage to the outside of the gas through the exhaust passage 75d is blocked, the pressure inside the control valve cylinder 75 increases due to the air pressure of the compressed air supplied from the timer chamber 32 to the third chamber 75a of the control valve cylinder 75. As the pressure inside the control valve cylinder 75 increases, the air pressure activates the first control valve 72, and as shown in Figure 8F, the first control valve 72 moves further upward.

[0099] As the first control valve 72 moves further upward from the pressure control start position P101 by the air pressure of compressed air, and moves to the second control valve operation start position, the first control valve 72 pushes the second control valve 71 upward. When the first control valve 72 moves to the operation end position P102, the second control valve 71 moves to the operation end position P111, and compressed air is supplied to the upper chamber 73b of the on-off valve cylinder 73, which is the space above the on-off valve 7.

[0100] When compressed air is supplied to the upper chamber 73b of the valve, the difference between the pressure acting on the valve 7 due to the compressed air supplied to the upper chamber 73b and the pressure acting on the valve 7 due to the compressed air supplied to the lower chamber 73a causes the valve 7 to move downward, as shown in Figure 8G, and the supply of compressed air to the air motor 31 stops. When the supply of compressed air to the air motor 31 stops, the rotation of the driver bit 2 stops.

[0101] When the rotation of the driver bit 2 stops and the tightening of the screw 200 is complete, the operator reduces the force with which they press the contact arm 8 against the material to be driven 300 and moves the main body 10 away from the material to be driven 300.

[0102] When the main body 10 moves away from the material to be driven 300, the pressure on the contact lever 60a by the upper arm (not shown) is released, and the contact lever 60a moves away from the start valve 6. When the contact lever 60a moves away from the start valve 6, the main valve 5 closes, and the supply of compressed air to the striking cylinder 30 stops.

[0103] When the supply of compressed air to the striking cylinder 30 is stopped and the pressure inside the striking cylinder 30 drops to atmospheric pressure, compressed air in the blowback chamber 33 is supplied to the space below the striking piston 30a, causing the driver bit 2 (striking piston 30a) to move to the top dead center position.

[0104] Furthermore, when the driver bit 2 moves to the top dead center position and the pressure in the blowback chamber 33 decreases, the supply of compressed air to the feed piston 92 stops. When the supply of compressed air to the feed piston 92 stops, the feed member 91 connected to the feed piston 92 moves toward the injection passage 12a due to the biasing force of the biasing member 95. In the movement of the feed member 91 toward the injection passage 12a, the feed member 91 engages with the connecting band 201, and the next screw 200 is fed toward the injection passage 12a.

[0105] As the next screw 200 is sent to the injection passage 12a, the connecting band 201, after the screw 200 has been injected, is discharged from the discharge port 12c to the outside of the nose section 12.

[0106] When the next screw 200 is fed to the ejection passage 12a, if there is still a screw connector 203 remaining in the magazine 90, the screw connector 203 pulled out from the spiral-wound portion in the magazine 90 is passed through the supply passage 96a. Also, even if there is no more screw connector 203 left in the magazine 90, the screw connector 203 remains in contact with the detector 210b of the screw detection unit 210 until the end of the screw connector 203 passes the detector 210b.

[0107] Thus, if a predetermined number of screws 200 remain in the supply passage 96a and the end of the screw connector 203 does not pass through the detector 210b of the screw detection unit 210, the screw detection unit 210 is pressed against the screw connector 203 by the detector 210b, as shown in Figure 4C. As a result, the screw detection unit 210 rotates around its shaft 210a as a pivot point, and the confirmation unit 210c retracts from the window 97b of the magazine cap unit 97 into the interior of the magazine cap unit 97. Therefore, the operator can confirm that a predetermined number of screws 200 remain by visually inspecting the window 97b of the magazine cap unit 97 or by touching it with their hand.

[0108] In contrast, as shown in Figure 9, when the screw 200 is used until the end of the screw connector 203 passes the detector 210b of the screw detection unit 210, the screw detection unit 210 causes the detector 210b to move away from the screw connector 203. As a result, the screw detection unit 210 is biased by the biasing member 210d and rotates around the shaft 210a as a pivot point, causing the confirmation unit 210c to protrude from the window 97b of the magazine cap unit 97 to the outside of the magazine cap unit 97. Therefore, the worker can visually confirm that the number of remaining screws 200 has fallen below a predetermined number before all the screws 200 are used up, by looking at the confirmation unit 210c protruding from the window 97b of the magazine cap unit 97, or by touching it with their hand. Thus, it becomes possible to select tasks that can be performed according to the number of remaining screws 200.

[0109] <Examples of the operation and effects of the screw driving machine of this embodiment> The screw gun 1A has a magazine cap 97 and a door 98 that are integrally connected to open and close the magazine 90. When the magazine cap 97 and door 98 are open, the sides of the magazine 90, the supply passage 96a, the ejection passage 12a, and the discharge port 12c are exposed. This makes it easy to load the screw connector 203 by placing the spirally wound screw connector 203 into the magazine 90 and inserting the screw connector 203, which has been pulled out from the spirally wound portion, into the supply passage 96a from the side. It also makes it easy to align the screw 200 with the ejection passage 12a and insert the screw connector 203 into the supply passage 96a.

[0110] Conventionally, the magazine cap portion on the magazine and the door portion on the nose portion are configured to be able to be opened and closed separately. Therefore, the door portion on the nose portion is configured to open and close by a rotational movement with a pivot point on an axis on the nose portion. In contrast, in the screw gun 1A, the magazine cap portion 97 and the door portion 98 are integrally connected to open and close the magazine 90. The end of the magazine cap portion 97 opposite to the side to which the door portion 98 is connected is supported by the magazine 90 via a support shaft 97a. Therefore, as shown in Figure 1A, when the magazine cap portion 97 and the door portion 98 of the screw gun 1A are open, an opening 12d is exposed in which the opening on the side of the injection passage 12a and the opening on the side of the discharge port 12c are connected along the first direction indicated by arrow B. When the door portion 98 is open, the opening 12d is exposed in a configuration connected to the discharge port 12c.

[0111] As a result, when loading an unused screw connector 203, the portion of the tape 204 extending beyond the tip of the screw connector 203 can be inserted into the opening 12d from the side, without having to remove all of the tape 204 securing the screw connector 203.

[0112] Furthermore, when removing the screw assembly 203 during use, the screw assembly 203 before the screw 200 is ejected from the spiral-shaped portion can be removed from the side of the supply passage 96a. In addition, the connecting band 201 after the screw 200 has been ejected can be removed from the side of the opening 12d. As a result, when removing the screw assembly 203 during use, the screw assembly 203 can be removed from the magazine 90 without detaching the connecting band 201 after the screw 200 has been ejected.

[0113] Furthermore, when loading a partially used screw connector 203, the connecting band 201 after the screw 200 has been ejected can be inserted into the opening 12d from the side. This allows the partially used screw connector 203 to be loaded into the magazine 90 without having to detach the connecting band 201 after the screw 200 has been ejected.

[0114] In the screw driving machine 1A, when the magazine cap portion 97 and door portion 98 are closed, the openings on the sides of the magazine 90, the supply passage 96a, the injection passage 12a, and the discharge port 12c are covered by the magazine cap portion 97 and door portion 98, and the opening 12d is covered by the magazine cap portion 97 and door portion 98. In addition, the door portion 98 covers the opening 12d when the discharge port 12c is open. This allows the supply passage 96b to be formed in a way that the connecting band 201 after the screw 200 has been injected can be discharged from the discharge port 12c to the outside of the nose portion 12.

[0115] As described above, the magazine cap portion 97 and the door portion 98 are integrally connected by a connecting shaft 98a, and the magazine cap portion 97 and the door portion 98 open together to expose the opening 12d, thereby facilitating the loading of the screw connector 203.

[0116] On the other hand, when the screw connector 203 is fed by the screw feeding unit 9, if the screw connector 203 becomes jammed in the supply passage 96a, a load is placed on the openable and closable door section 98.

[0117] In contrast, when the screw gun 1A's magazine cap portion 97 and door portion 98 are closed, the side of the door portion 98 closest to the connecting shaft 98a connected to the magazine cap portion 97 is held closed by the first engaging portion 99a. The side closest to the nose portion 12 is held closed by the second engaging portion 99b through the engagement of the engaging projection 99c and the engaging recess 99d.

[0118] As a result, the magazine cap portion 97 and the door portion 98 are integrally connected by a connecting shaft 98a, and the door portion 98 can ensure the same strength as the door portion in a configuration where the magazine cap portion and the door portion open and close separately.

[0119] Furthermore, in the screw gun 1A, the magazine cap section 97 and the door section 98 are integrally connected by a connecting shaft 98a, so that the magazine cap section 97 and the door section 98 can change between a linearly extended form and a bent form by relative rotation with the connecting shaft 98a as the pivot point.

[0120] Furthermore, the screw gun 1A is , person in charge The door portion 98 is provided with a matching protrusion 99c, and the nose portion 12 is provided with an engaging recess 99d. On the side of the engaging recess 99d closer to the nose portion 12, Extends from the engaging recess 99d toward the magazine 90. and connects with the engaging recess 99d The system is equipped with a guide portion 99e, and the engagement projection 99c can be inserted into and removed from the engagement recess 99d using the guide portion 99e as a guide.

[0121] As a result, the second engaging portion 99b changes the shape of the magazine cap portion 97 and door portion 98 from a bent shape to a straight, extended shape, so that the engaging projection 99c enters the engaging recess 99d using the guide portion 99e as a guide, and the engaging projection 99c moves further along the engaging recess 99d so that the engaging projection 99c and the engaging recess 99d engage, and the magazine cap portion 97 and door portion 98 are closed.

[0122] Therefore, compared to a configuration in which the magazine cap portion on the magazine and the door portion on the nose portion open and close independently, the magazine cap portion 97 and the door portion 98 can be opened and closed together, making it easier to open and close the magazine 90 using the magazine cap portion 97 and the door portion 98. In addition, the operation of closing the magazine cap portion 97 and the door portion 98 suppresses the generation of load caused by the engagement of the engaging projection portion 99c and the engaging recess portion 99d.

[0123] In this embodiment, a screw gun operated by air pressure was used as an example tool, but the method can also be applied to electrically driven screw guns, nail guns that use nails as fasteners and are operated by air pressure, and electrically driven nail guns. [Explanation of symbols]

[0124] 1A... Screw driver (handheld tool), 10... Main body, 11... Handle, 12... Nose, 12a... Injection passage, 12b... Injection port, 12c... Discharge port, 12d... Opening, 13... Main chamber, 2... Driver bit, 3... Fastening part, 30... Impact cylinder, 30a... Impact piston, 31... Air motor, 5... Main valve, 6... Start valve, 6 0...Trigger, 60a...Contact lever, 7...On / off valve, 70...Control unit, 72...First control valve, 71...Second control valve, 8...Contact arm, 90...Magazine, 9...Screw feed unit, 91...Feeding member, 96a...Supply passage, 97...Magazine cap unit (lid), 97a...Support shaft, 98...Door unit (lid), 98a...Connecting shaft, 98b...Biasing member, 98c...Tip, 99a...First engaging portion, 99b...Second engaging portion (engaging portion), 99c...Engaging projection, 99d...Engaging recess, 99e...Guide portion, 99f...Introduction portion, 200...Screw (fastener), 201...Connecting band, 203...Screw connector (fastener connector), 300...Material to be driven in

Claims

1. A nose section having a zipper ejection passage, A magazine that houses the aforementioned fastener and is located in a direction intersecting the injection passage, In the aforementioned intersecting directions, the magazine cap portion includes a tip portion on the injection passage side and a base portion in the opposite direction to the tip portion, and the tip portion rotates in a direction toward and toward the magazine with the base portion as a pivot point, and the magazine can be opened and closed by moving toward and toward the magazine, The magazine cap portion is provided with a door portion that is rotatably connected to the tip portion via a connecting shaft, The nose portion has an engaging portion that can engage with the door portion, The door portion, when the magazine cap portion is open, bends toward the magazine with the connecting shaft as a pivot point, and when the magazine cap portion is closed, extends in a straight line and engages with the engagement portion. Handheld tools.

2. The door portion is provided with a biasing portion that biases it in a direction that bends relative to the magazine cap portion. The hand tool described in claim 1.

3. The nose portion has a guide portion that, when the magazine cap portion is closed, straightens the door portion, which is bent relative to the magazine cap portion, against the biasing force of the biasing portion. The hand tool described in claim 2.

4. The door portion is extended in a straight line by the guide portion, thereby engaging with the engagement portion. The hand tool described in claim 3.

Images