Patent Description:
A handheld tool that injects a fastener such as a screw or a nail includes a magazine that accommodates the fastener. The magazine accommodates a fastener coupling body in which a plurality of fasteners are coupled by a coupling band. In such a tool, a nose portion from which the fastener is injected, a magazine cap portion provided in the magazine in order to allow the fastener coupling body to be loaded into the magazine, and a door portion provided in the nose portion are configured to be opened and closed, respectively (for example, see <CIT>).

<CIT> shows the preamble of claim <NUM>.

Other examples are known from <CIT>, <CIT> or <CIT>.

In the related art, it is necessary to independently open and close the magazine cap portion provided in the magazine and the door portion provided in the nose portion. Thus, it takes time and effort to perform an operation of opening and closing the magazine by the magazine cap portion and the door portion.

Illustrative aspects of the present disclosure provide a handheld tool that facilitates an operation of opening and closing a magazine by a magazine cap portion and a door portion.

One illustrative aspect of the present disclosure provides a handheld tool including: a nose portion having an injection passage for a fastener; a magazine configured to accommodate the fastener and located in an intersecting direction intersecting with the injection passage; a magazine cap portion including a tip portion and a base end portion, the base end portion being opposite to the tip portion in the intersecting direction, the magazine cap portion being configured to open and close the magazine by the tip portion separating from and approaching the magazine, the tip portion being rotatable in a direction separating from and approaching the magazine with the base end portion as a fulcrum; and a door portion rotatably coupled to the tip portion of the magazine cap portion via a coupling shaft. The nose portion includes an engaging portion engageable with the door portion. The door portion is configured to: in a state where the magazine cap portion is opened, bent toward the magazine with the coupling shaft as a fulcrum; and in a state where the magazine cap portion is closed, extend linearly and engage with the engaging portion.

In the present disclosure, in a form in which the magazine cap portion and the door portion are bent by rotation with the coupling shaft as a fulcrum, a distance between the base end portion of the magazine cap portion and a tip portion of the door portion is shorter as compared with that in a form in which the magazine cap portion and the door portion extend linearly. Accordingly, in the form in which the magazine cap portion and the door portion are bent, the door portion does not engage with the engaging portion by an operation in which the magazine cap portion and the door portion open and close the magazine by rotation of the magazine cap portion with the base end portion as a fulcrum. On the other hand, in a state where the magazine is closed by the magazine cap portion and the door portion, the magazine cap portion and the door portion extend linearly, and the door portion engages with the engaging portion. In this manner, by changing the magazine cap portion and the door portion from the form of being bent to the form of extending linearly, the magazine cap portion and the door portion are closed in a closed state.

In the present disclosure, since the magazine cap portion and the door portion are rotatably coupled to each other via the coupling shaft, the engaging portion does not hinder opening and closing of the magazine by the magazine cap portion and the door portion in the form in which the magazine cap portion and the door portion are bent. On the other hand, in the state where the magazine is closed by the magazine cap portion and the door portion, the magazine cap portion and the door portion extend linearly, and the door portion engages with the engaging portion. Accordingly, since the magazine cap portion and the door portion can be integrally opened and closed, the operation of opening and closing the magazine by the magazine cap portion and the door portion is easy.

Hereinafter, illustrative embodiments of a screw driving machine as an example of a handheld tool of the present disclosure will be described with reference to the drawings.

<FIG>, <FIG>, <FIG>, and <FIG> are perspective views illustrating examples of a screw driving machine according to the present illustrative embodiment. <FIG> illustrates a state where a magazine is in an open state and screws are not loaded, and <FIG> illustrates a state where the magazine is in the open state and the screws are loaded. In addition, <FIG> illustrates a state where the magazine is in a closed state and the screws are not loaded, and <FIG> illustrates a state where the magazine is in the closed state and the screws are loaded.

<FIG> and <FIG> are front views illustrating examples of the screw driving machine according to the present illustrative embodiment. <FIG> illustrates a state where the magazine is in the open state and the screws are loaded, and <FIG> illustrates a state where the magazine is in the closed state and the screws are loaded. Further, <FIG> is a front sectional view illustrating an example of the screw driving machine according to the present illustrative embodiment. In addition, <FIG> is a side sectional view illustrating an example of the screw driving machine according to the present illustrative embodiment, <FIG> is a front sectional view illustrating the example of the screw driving machine according to the present illustrative embodiment, and <FIG> is a bottom sectional view illustrating the example of the screw driving machine according to the present illustrative embodiment. In addition, <FIG> is a perspective view illustrating an example of a screw coupling body.

As illustrated in <FIG>, in a screw driving machine 1A, a plurality of screws <NUM> which are fasteners are coupled by a coupling band <NUM>, and a screw coupling body <NUM> in a form of being wound in a spiral shape, for example, is used as a fastener coupling body. An unused screw coupling body <NUM> is fixed by a tape <NUM> such that the spiral shape is not deformed. The coupling band <NUM> may be formed by a plastic sheet having a predetermined shape that supports a shaft portion of the screw <NUM> or a nail, or may be formed by bonding a plurality of fasteners with a tape or by welding the plurality of fasteners with a metal wire.

A screw driving machine 1A includes a fastening portion <NUM> that is driven by compressed air, causes a driver bit <NUM> to move in an axial direction, drives the screw <NUM> into a driven member <NUM>, and then causes the driver bit <NUM> to rotate to tighten the screw <NUM>. The fastening portion <NUM> includes a driving cylinder <NUM> that causes the driver bit <NUM> to move in the axial direction, and an air motor <NUM> that causes the driver bit <NUM> to rotate around an axis.

In addition, the screw driving machine 1A includes a main valve <NUM>, a start valve <NUM>, and a trigger <NUM>. The main valve <NUM> is configured to switch whether to supply the compressed air to the driving cylinder <NUM>. The start valve <NUM> is configured to cause the main valve <NUM> to operate. The trigger <NUM> is configured to cause the start valve <NUM> to operate.

Further, the screw driving machine 1A includes an on-off valve <NUM> and a controller <NUM>. The on-off valve <NUM> is configured to switch whether an operation of the air motor <NUM> is to be performed. The controller <NUM> is configured to cause the on-off valve <NUM> to operate. In addition, the screw driving machine 1A includes a contact arm <NUM>. The contact arm <NUM> is configured to come into contact with the driven member <NUM>, be movable in the axial direction along a driving direction of the screw <NUM>, enable the start valve <NUM> to operate in cooperation with an operation of the trigger <NUM>, and cause the controller <NUM> to operate.

In addition, the screw driving machine 1A includes a screw feeding portion <NUM> and a magazine <NUM>. The screw feeding portion <NUM> is configured to feed the screw coupling body <NUM> to a nose portion <NUM> to be described later. The magazine <NUM> is configured to accommodate the screw coupling body <NUM> to be fed by the screw feeding portion <NUM>.

The screw driving machine 1A includes a main body portion <NUM> and a handle portion <NUM>. The handle portion <NUM> extends in a direction intersecting the main body portion <NUM>. In the screw driving machine 1A, the nose portion <NUM> is provided on one side along an extending direction of the main body portion <NUM> extending along the axial direction of the driver bit <NUM>. The driver bit <NUM> is configured to pass through the nose portion <NUM> when the screw <NUM> coupled by the coupling band <NUM> is supplied by the screw feeding portion <NUM>. In the screw driving machine 1A, the one side along the extending direction of the main body portion <NUM> on which the nose portion <NUM> is provided is referred to as a lower side, and the other side along the extending direction of the main body portion <NUM> is referred to as an upper side. In the screw driving machine 1A, the magazine <NUM> is provided on the lower side of the handle portion <NUM> in a case where one side of the handle portion <NUM> along an extending direction of the main body portion <NUM> is directed toward the lower side.

The nose portion <NUM> has an injection passage 12a and an injection port 12b. The screw <NUM> coupled by a coupling band <NUM> is supplied to the injection passage 12a. The injection port 12b is formed in one end portion along an extending direction of the injection passage 12a indicated by an arrow A. The screw <NUM> separated from the coupling band <NUM> is injected from the injection port 12b.

The screw driving machine 1A includes a main chamber <NUM>. The main chamber <NUM> is supplied with compressed air from an external air compressor (not illustrated). The main chamber <NUM> is provided in the handle portion <NUM> and on an outer periphery of the driving cylinder <NUM> connected to an inside of the handle portion <NUM> in the main body portion <NUM>. Compressed air decompressed by a pressure reducing valve 13a is supplied to the main chamber <NUM>. In addition, the screw driving machine 1A includes an exhaust pipe <NUM>. The compressed air supplied to the driving cylinder <NUM>, the air motor <NUM>, and the like, is exhausted from the exhaust pipe <NUM>. The exhaust pipe <NUM> is provided in the handle portion <NUM>. The compressed air is exhausted from the exhaust pipe <NUM> via an exhaust filter 14a.

The driving cylinder <NUM> is provided inside the main body portion <NUM> in a form of extending vertically. The driving cylinder <NUM> is provided with a driving piston 30a in a cylindrical internal space so as to be slidable. The driving piston 30a includes a seal portion 30b on an outer periphery thereof. The driving piston 30a is accommodated in the driving cylinder <NUM>. The driving piston 30a partitions an interior of the driving cylinder <NUM> into a first chamber 30c and a second chamber 30d. A motor shaft 31a is attached to the driving piston 30a. The motor shaft 31a is driven by the air motor <NUM>. In a state where the driving piston 30a is at the top dead center position, the driver bit <NUM> is connected to a first chamber 30c side. That is, the driver bit <NUM> is detachably attached to the driving piston 30a via the motor shaft 31a in a form of protruding from the driving piston 30a toward the lower side. In addition, the motor shaft 31a is provided on a side opposite to the driver bit <NUM> with respect to the driving piston 30a. The motor shaft 31a is attached to the driving piston 30a in a form of protruding from the driving piston 30a toward the upper side.

In the driving cylinder <NUM>, the compressed air is supplied from the main chamber <NUM> to the second chamber 30d. The driving piston 30a is pressed by an air pressure of the compressed air supplied to the second chamber 30d of the driving cylinder <NUM> and moves in a downward direction indicated by an arrow D to cause the driver bit <NUM> to move in the downward direction along the axial direction. The driver bit <NUM> and the motor shaft 31a move integrally with the driving piston 30a. The driver bit <NUM> that moves in the downward direction is guided by the nose portion <NUM>, thereby driving the screw <NUM> supplied from the magazine <NUM> to the nose portion <NUM> into the driven member <NUM>. In addition, when the driver bit <NUM> is driven by the air motor <NUM> and the motor shaft 31a rotates, the driver bit <NUM> rotates integrally with the motor shaft 31a to fasten the screw <NUM> driven into the driven member <NUM>.

The screw driving machine 1A includes a timer chamber <NUM> and a blowback chamber <NUM>. The timer chamber <NUM> is supplied with the compressed air for causing the controller <NUM> to operate. The blowback chamber <NUM> causes the driving piston 30a moved to the bottom dead center position to return to the top dead center position and is supplied with the compressed air for causing the screw feeding portion <NUM> to operate.

The timer chamber <NUM> and the blowback chamber <NUM> are provided on an outer peripheral side of the driving cylinder <NUM> inside the main body portion <NUM>. The timer chamber <NUM> is in communication with a space in the driving cylinder <NUM> via a side hole flow path 32a of the driving cylinder <NUM>. In addition, the blowback chamber <NUM> is in communication with the space in the driving cylinder <NUM> via a side hole flow path 33a of the driving cylinder <NUM>. In the timer chamber <NUM> and the blowback chamber <NUM>, the compressed air is supplied by an operation of the driving piston 30a moving from the top dead center position to the bottom dead center position, and pressure increases according to a position of the driving piston 30a.

The air motor <NUM> includes a rotor 31b1, a blade 31b2, and a motor housing 31c. The rotor 31b1 is configured to rotate the motor shaft 31a. The blade 31b2 is configured to receive a flow of air for causing the rotor 31b1 to rotate. The motor housing 31c rotatably supports the rotor 31b1 and is configured to generate the flow of air for causing the rotor 31b1 to rotate. In the air motor <NUM>, rotation of the rotor 31b1 is transmitted to the motor shaft 31a via a speed reducer 31d. The speed reducer 31d is provided between the driving cylinder <NUM> and the air motor <NUM>. The speed reducer 31d is configured by a planetary gear mechanism. The speed reducer 31d includes a sun gear 31e connected to the rotor 31b1, a plurality of planetary gears 31f meshing with the sun gear 31e, an outer gear <NUM> meshing with the planetary gears 31f, and a carrier <NUM> rotatably supporting the planetary gears 31f. In the speed reducer 31d, the sun gear 31e, the planetary gears 31f, and the outer gear <NUM> are provided on the same surface in the axial direction of the driver bit <NUM>. In addition, in the speed reducer 31d, the carrier <NUM><NUM> is provided on the lower side of the sun gear 31e, the planetary gears 31f, and the outer gear <NUM>.

The rotor 31b1 has a hollow structure in which a hole portion 31b3 is provided so as to penetrate from an upper end to a lower end in the axial direction along an upward direction indicated by an arrow U and the downward direction indicated by the arrow D. The motor shaft 31a is inserted into the hole portion 31b3 so as to be movable in the axial direction. The hole portion 31b3 is provided coaxially with a center of rotation of the rotor 31b1. The rotor 31b1 is provided with an engagement position connected to the sun gear 31e on the lower end thereof. The engagement position connected to the sun gear 31e is configured by a polygonal shaft, for example, a hexagonal shaft, and in the sun gear 31e, an engagement position connected to the rotor 31b1 is formed by a polygonal hole, for example, a hexagonal hole. The outer gear <NUM> has teeth formed on an inner peripheral surface of an annular member, and is non-rotatably fixed concentrically with the sun gear 31e. The planetary gear 31f is rotatably supported by the carrier <NUM>, and meshes with the sun gear 31e and the outer gear <NUM> in a form of being interposed between the sun gear 3le and the outer gear <NUM>. Accordingly, in the speed reducer 31d, when the sun gear 31e rotates as the rotor 31b1 rotates, the carrier <NUM> rotates at a predetermined reduction ratio while the planetary gear 31f rotates.

The carrier <NUM> includes a plurality of gear rollers 31i that support the motor shaft 31a to be movable in the axial direction. The gear rollers 31i are rotatably supported by the carrier <NUM> in a disposition in which outer peripheral surfaces thereof are positioned on sides of a polygon, for example, a triangle, surrounding a center of rotation of the carrier <NUM>. The motor shaft 31a has a configuration in which a position in contact with the gear roller 31i is a flat surface. The motor shaft 31a has three flat surfaces in accordance with the disposition of the gear rollers 31i. Accordingly, the motor shaft 31a is supported at the center of rotation of the carrier <NUM> by the plurality of gear rollers 31i, and is movable in the axial direction by rotation of the gear rollers 31i. Thus, when the driving piston 30a moves in the downward direction in the driving cylinder <NUM> due to the air pressure of the compressed air, the motor shaft 31a moves in the downward direction integrally with the driving piston 30a and the driver bit <NUM>.

When the flat surface of the motor shaft 31a comes into contact with the gear roller 31i, the motor shaft 31a rotates together with the carrier <NUM>. Thus, when the rotor 31b1 of the air motor <NUM> rotates due to the air pressure of the compressed air, the motor shaft 31a rotates together with the carrier <NUM> rotating at the predetermined reduction ratio.

The air motor <NUM> is provided on the upper side of the main body portion <NUM>. In the air motor <NUM>, the motor shaft 31a is provided coaxially with the driver bit <NUM>. Accordingly, the air motor <NUM> is provided coaxially with the driving cylinder <NUM> on a second chamber 30d side with respect to the driving cylinder <NUM>, that is, on a side opposite to the lower side on which the nose portion <NUM> is provided in the main body portion <NUM> and on the upper side of the driving cylinder <NUM> along the axial direction of the driver bit <NUM>. In addition, with a configuration in which the motor shaft 31a is inserted into the hole portion 31b3 provided in the rotor 31b1 and a configuration in which the air motor <NUM> is provided on the upper side of the driving cylinder <NUM>, the air motor <NUM> ensures a space in which the motor shaft 31a moving in an up-down direction operates.

The main valve <NUM> is vertically movably provided on an outer peripheral side of the driving cylinder <NUM>. In addition, the main valve <NUM> is biased by a main valve spring <NUM> in the downward direction, which is a direction in which an air flow path <NUM> is closed. Further, in the main valve <NUM>, the compressed air is supplied, via the start valve <NUM>, from the main chamber <NUM> to a main valve upper chamber <NUM> in which the main valve spring <NUM> is provided, and the main valve <NUM> is pressed in the downward direction by the air pressure of the compressed air. In addition, in the main valve <NUM>, the compressed air is supplied from the main chamber <NUM> to a main valve lower chamber <NUM>, and the main valve <NUM> is pressed in the downward direction by the air pressure of the compressed air.

Accordingly, the main valve <NUM> opens and closes the air flow path <NUM> connecting the main chamber <NUM>, the driving cylinder <NUM>, and the air motor <NUM>. The air flow path <NUM> is provided between the driving cylinder <NUM> and the main valve <NUM> on an inner peripheral side of the main valve <NUM> and on the outer peripheral side of the driving cylinder <NUM>, and is connected to the main valve lower chamber <NUM> via the main valve <NUM>. When the main valve <NUM> is not in operation, the main valve <NUM> is biased in the downward direction to be located at the bottom dead center position based on a relation, the relation being of a force of the main valve spring <NUM> and a balance between the air pressure of the compressed air supplied to the main valve upper chamber <NUM> and the air pressure of the compressed air supplied to the main valve lower chamber <NUM>, thereby blocking the air flow path <NUM> between the main valve lower chamber <NUM> and the driving cylinder <NUM>. On the other hand, when the main valve <NUM> is in operation, the main valve <NUM> is pressed in the upward direction by the air pressure of the compressed air supplied from the main chamber <NUM> to the main valve lower chamber <NUM> when the main valve upper chamber <NUM> is in communication with the atmosphere via the start valve <NUM>, thereby opening the air flow path <NUM> between the main valve lower chamber <NUM> and the driving cylinder <NUM>.

The start valve <NUM> includes a pilot valve <NUM>, a valve stem <NUM>, and a valve stem spring <NUM>. The pilot valve <NUM> is configured to open and close the main valve upper chamber <NUM>. The valve stem <NUM> is configured to cause the pilot valve <NUM> to operate. The valve stem spring <NUM> is configured to bias the pilot valve <NUM> in the upward direction and to bias the valve stem <NUM> in the downward direction.

In the start valve <NUM>, the pilot valve <NUM> is pressed in the downward direction due to the air pressure of the compressed air supplied from the main chamber <NUM>. In addition, in the start valve <NUM>, the pilot valve <NUM> is pressed in the upward direction due to the air pressure of the compressed air supplied from the main chamber <NUM> to a valve lower chamber <NUM>.

Accordingly, in the start valve <NUM>, the pilot valve <NUM> is held at an upper position based on a relation between a balance of the air pressure of the compressed air and a force of the valve stem spring <NUM>. On the other hand, in the start valve <NUM>, when the valve stem <NUM> moves in the upward direction, the valve lower chamber <NUM> is in communication with the atmosphere, and thus the pilot valve <NUM> moves in the downward direction due to the air pressure of the compressed air. Further, when the pilot valve <NUM> moves in the downward direction, a passage through which the main valve upper chamber <NUM> communicates with the atmosphere is opened.

The trigger <NUM> is provided on the lower side of the handle portion <NUM> and is rotatable about 60c as a fulcrum in response to an operation of an operator. The trigger <NUM> is biased in the direction separating from the valve stem <NUM> of the start valve <NUM> by a trigger spring 60d.

The trigger <NUM> includes a contact lever 60a that causes the valve stem <NUM> of the start valve <NUM> to operate. The contact lever 60a is supported by the trigger <NUM> so as to be rotatable about a shaft 60b as a fulcrum. The contact lever 60a does not come into contact with the valve stem <NUM> only in a state where an operation of pulling the trigger <NUM> is performed. In contrast, when the contact lever 60a is pressed by an upper arm (not illustrated) of the contact arm <NUM> in the state where the operation of pulling the trigger <NUM> is performed, the valve stem <NUM> is caused to move in the upward direction. Accordingly, the start valve <NUM> is operated by a combination of an operation of the trigger <NUM> and an operation of being pressed by the contact arm <NUM>.

The contact arm <NUM> includes a lower arm <NUM> and an upper arm (not illustrated). The lower arm <NUM> is configured to come into contact with the driven member <NUM>. The upper arm (not illustrated) is configured to cause the contact lever 60a of the trigger <NUM> to operate. The lower arm <NUM> is supported by the nose portion <NUM> so as to be movable in the up-down direction. The lower arm <NUM> is biased in the downward direction by a biasing member (not illustrated).

The screw driving machine 1A includes a tightening depth adjusting portion <NUM>. The tightening depth adjusting portion <NUM> defines an upper fulcrum position of the lower arm <NUM> and is configured to cause the first control valve <NUM> to operate when the lower arm <NUM> moves to the upper fulcrum position.

The tightening depth adjusting portion <NUM> includes an adjusting portion main body 86a and an abutting portion 86b whose protrusion height with respect to the adjusting portion main body 86a is adjustable. The tightening depth adjusting portion <NUM> is supported so as to be movable along moving directions of the lower arm <NUM> indicated by the arrows U and D, and is biased in the downward direction indicated by the arrow D by a biasing member 86c such as a coil spring.

The tightening depth adjusting portion <NUM> has a configuration in which the adjusting portion main body 86a and the abutting portion 86b are joined by, for example, screwing a male screw and a female screw. In the tightening depth adjusting portion <NUM>, a dial portion 86d for causing the adjusting portion main body 86a to rotate is exposed to an outside of the main body portion <NUM>. The adjusting portion main body <NUM> is caused to rotate by an operation of the dial portion 86d, whereby a protrusion amount of the abutting portion 86b with respect to the adjusting portion main body 86a is switched, and an entire length of the tightening depth adjusting portion <NUM> is changed.

In the tightening depth adjusting portion <NUM>, the abutting portion 86b faces the lower arm <NUM>. In the tightening depth adjusting portion <NUM>, the abutting portion 86b and the lower arm <NUM> are separated from each other in a state where the lower arm <NUM> moves to the bottom dead center position. In the tightening depth adjusting portion <NUM>, when the lower arm <NUM> moves in the upward direction as indicated by the arrow U from the bottom dead center position, the lower arm <NUM> comes into contact with the abutting portion 86b.

When the tightening depth adjusting portion <NUM> is pressed up by the lower arm <NUM> moving in the arrow U direction and moves to a position where the adjusting portion main body 86a comes into contact with a movement regulating portion 86e, the tightening depth adjusting portion <NUM> regulates the lower arm <NUM> from further moving in the arrow U direction.

Accordingly, a position of the lower arm <NUM> regulated by the movement to the position where the tightening depth adjusting portion <NUM> comes into contact with the movement regulating portion 86e becomes the upper fulcrum position of the lower arm <NUM>.

In the tightening depth adjusting portion <NUM>, the protrusion amount of the abutting portion 86b with respect to the adjusting portion main body 86a is switched by the operation of the dial portion 86d, and the entire length of the tightening depth adjusting portion <NUM> is changed. When the entire length of the tightening depth adjusting portion <NUM> is changed, the top dead center position of the lower arm <NUM> moves. When the top dead center position of the lower arm <NUM> moves, a protrusion amount of the driver bit <NUM> with respect to a lower end surface of the lower arm <NUM> changes, the driver bit <NUM> being moved to the bottom dead center position with respect to the lower end surface of the lower arm <NUM>, and a tightening depth of the screw <NUM> with respect to the driven member <NUM> changes.

The on-off valve <NUM> is vertically movably supported by an on-off valve cylinder <NUM> provided in the motor housing 31c. In the on-off valve cylinder <NUM>, an on-off valve lower chamber 73a is provided on the lower side of the on-off valve <NUM> indicated by the arrow D, and an on-off valve upper chamber 73b is provided on the upper side of the on-off valve <NUM> indicated by the arrow U. The on-off valve <NUM> is operated due to the compressed air supplied from the main chamber <NUM> and, in a state where the compressed air is not supplied to the on-off valve upper chamber 73b, the on-off valve <NUM> moves in the upward direction indicated by the arrow U due to the compressed air supplied to the on-off valve lower chamber 73a. In addition, when the compressed air is supplied to the on-off valve upper chamber 73b, the on-off valve upper chamber 73b moves in the downward direction as indicated by the arrow D.

The on-off valve <NUM> is configured to open and close the air flow path <NUM> connected to the air motor <NUM> by moving in the up-down direction. The air flow path <NUM> is in communication with the air flow path <NUM> on a downstream side of the main valve <NUM>. In the air flow path <NUM>, a flow of air between the main chamber <NUM> and the air motor <NUM> is blocked when the on-off valve <NUM> moves in the downward direction and is closed. In addition, in the air flow path <NUM>, when the on-off valve <NUM> moves in the upward direction and opens, communication between the main chamber <NUM> and the air motor <NUM> is established. The on-off valve <NUM> is provided on a side portion of the air motor <NUM>.

The controller <NUM> includes a control valve cylinder <NUM>, a first control valve <NUM>, a communication passage 75c, and a second control valve <NUM>. The first control valve <NUM> is accommodated in the control valve cylinder <NUM> and partitions an inside of the control valve cylinder <NUM> into a third chamber 75a and a fourth chamber 75b. The communication passage 75c allows the inside of the driving cylinder <NUM> and the third chamber 75a in the control valve cylinder <NUM> to communicate with each other via the timer chamber <NUM>. The second control valve <NUM> is located on an arrow U direction side with respect to the first control valve <NUM> and is disposed away from the first control valve <NUM>.

In addition, the controller <NUM> includes a first biasing member 72b and a second biasing member 71a. The first biasing member 72b is a first biasing portion configured to bias the first control valve <NUM> in an arrow D direction. The second biasing member 71a is a second biasing portion configured to bias the second control valve <NUM> in an arrow D direction.

In the control valve cylinder <NUM>, the third chamber 75a is provided on the lower side of the first control valve <NUM> indicated by the arrow D, and the fourth chamber 75b is provided on the upper side of the first control valve <NUM> indicated by the arrow U. In the control valve cylinder <NUM>, the third chamber 75a is in communication with the timer chamber <NUM> via the communication passage 75c, and is in communication with the space in the driving cylinder <NUM> via the timer chamber <NUM>. In addition, in the control valve cylinder <NUM>, the third chamber 75a is in communication with an outside of a body of the screw driving machine 1A via an exhaust passage 75d.

The first control valve <NUM> is vertically movably supported by the control valve cylinder <NUM> along the upward direction indicated by the arrow U and the downward direction indicated by the arrow D. In addition, in the first control valve <NUM>, a rod-shaped coupling portion 72a extending in the up-down direction is coupled in a form protruding in the upward direction indicated by the arrow U. Further, the first control valve <NUM> is biased in the arrow D direction by the first biasing member 72b such as a coil spring. The first control valve <NUM> faces the adjusting portion main body 86a of the tightening depth adjusting portion <NUM>.

The first control valve <NUM> is configured to be movable to a standby position P100 which is the bottom dead center position by moving in the downward direction indicated by the arrow D, and is configured to be movable to a later-described operation completion position which is the top dead center position by moving in the upward direction indicated by the arrow U.

The first control valve <NUM> moves to the standby position P100 by being biased in the arrow D direction by the first biasing member 72b.

The first control valve <NUM> includes a seal portion 72c that opens and closes the exhaust passage 75d. In a state where the first control valve <NUM> stands by at the standby position P100, the seal portion 72c moves to a position to open the exhaust passage 75d, and the third chamber 75a of the control valve cylinder <NUM> is in communication with the outside of the body of the screw driving machine 1A via the exhaust passage 75d. When the first control valve <NUM> moves to a later-described pressure control start position between the standby position P100 and the operation completion position in a process of moving from the standby position P100 to the operation completion position, the seal portion 72c moves to a position to close the exhaust passage 75d.

The first control valve <NUM> standing by at the standby position P100 is pressed and operated by the lower arm <NUM> via the tightening depth adjusting portion <NUM>, and moves from the standby position P100 to the pressure control start position. In addition, when the first control valve <NUM> moves to the pressure control start position, the first control valve <NUM> is operated due to the compressed air supplied from the timer chamber <NUM> and moves from the pressure control start position to the operation completion position. In the process of moving from the pressure control start position to the operation completion position, the first control valve <NUM> presses the second control valve <NUM> via the coupling portion 72a to cause the second control valve <NUM> to operate.

The second control valve <NUM> is configured by a rod-shaped member extending in the up-down direction, and is vertically movably supported with respect to the on-off valve <NUM>. The second control valve <NUM> moves to a standby position P110 by being biased in the arrow D direction by the second biasing member 71a. In addition, the second control valve <NUM> is operated by being pressed by the first control valve <NUM>. The second control valve <NUM> is movable from the standby position P110 to the later-described operation completion position and is configured to cause the on-off valve <NUM> to operate by switching whether to supply the compressed air to the on-off valve upper chamber 73b of the on-off valve cylinder <NUM>.

The controller <NUM> includes an adjustment member 71b configured to adjust a biasing force of the second biasing member 71a. The adjustment member 71b configures an adjustment portion. For example, a screw is formed on an outer periphery of the adjustment member 71b, and a length of the second biasing member 71a in an expansion and contraction direction is adjusted by adjusting a tightening amount of the screw.

The screw feeding portion <NUM> includes a feeding member <NUM> and a feed piston <NUM>. The feeding member <NUM> is configured to feed the screw coupling body <NUM>. The feed piston <NUM> is configured to cause the feeding member <NUM> to operate. The feeding member <NUM> is supported so as to be movable in a direction approaching and a direction separating from the injection passage 12a of the nose portion <NUM>. The feeding member <NUM> is configured to feed the screw <NUM>, which is locked by the coupling band <NUM> and is coupled by the coupling band <NUM>, to the injection passage 12a.

The feed piston <NUM> is coupled to the feeding member <NUM> and is provided in a feed cylinder <NUM> so as to be slidable. The feed cylinder <NUM> is connected to the blowback chamber <NUM> via a feed flow path <NUM>, and is supplied with compressed air from the blowback chamber <NUM>.

The feed piston <NUM> is operated due to an air pressure of the compressed air supplied from the blowback chamber <NUM> to cause the feeding member <NUM> to move in the direction separating from the injection passage 12a. In addition, when the feeding member <NUM> is biased by a biasing member <NUM> such as a coil spring in the direction approaching the injection passage 12a and the air pressure in the feed cylinder <NUM> decreases, the feed piston <NUM> causes the feeding member <NUM> to move in the direction approaching the injection passage 12a by being biased by the biasing member <NUM>.

The magazine <NUM> is provided on the lower side of the handle portion <NUM> and is coupled to the nose portion <NUM>. The screw coupling body <NUM> illustrated in <FIG> is accommodated in the magazine <NUM>. The magazine <NUM> is located in an intersecting direction intersecting with the injection passage 12a. Incidentally, the intersecting direction may be an extending direction of the handle portion <NUM>.

The screw driving machine 1A has a supply passage 96a. The supply passage 96a connects the injection passage 12a and the magazine <NUM>. The screw coupling body <NUM> is fed through the supply passage 96a along a first direction indicated by an arrow B intersecting with the extending direction of the injection passage 12a.

The supply passage 96a is formed by a part of a member configuring the magazine <NUM> and a part of a member configuring the nose portion <NUM>. The supply passage 96a extends along the first direction indicated by the arrow B between the injection passage 12a and a space in the magazine <NUM> in which the screw coupling body <NUM> in a form of being wound in a spiral shape is accommodated.

In addition, the screw driving machine 1A has a discharge port 12c. The discharge port 12c connects the injection passage 12a and an outside of the nose portion <NUM>. The coupling band <NUM>, from which the screw <NUM> has been injected, is discharged through the nose portion <NUM> along the first direction indicated by the arrow B.

In the nose portion <NUM>, the discharge port 12c is located on a side opposite to the supply passage 96a via the injection passage 12a on an extension line of the supply passage 96a. The discharge port 12c is formed by providing an opening having a size through which the coupling band <NUM> can pass in a part of a surface facing the first direction indicated by the arrow B.

In the screw driving machine 1A, a side portion of the magazine <NUM>, a side portion of the supply passage 96a, a side portion of the injection passage 12a, and a side portion of the discharge port 12c are opened, the side portions facing a second direction indicated by an arrow C. The second direction intersects with the direction, in which the injection passage 12a extends and which is indicated by the arrow A, and the first direction indicated by the arrow B.

The screw driving machine 1A includes a magazine cap portion <NUM>. The magazine cap portion <NUM> includes a tip portion on an injection passage 12a side and a base end portion opposite to the tip portion in a direction intersecting with the injection passage 12a. By the tip portion rotating in a direction separating from and approaching the magazine <NUM> with the base end portion as a fulcrum, the magazine cap portion <NUM> is configured to open and close the magazine <NUM> by the tip portion separating from and approaching the magazine <NUM>. The magazine cap portion <NUM> is configured to cover a part of the opened side portion of the magazine <NUM> and the opened side portion of the supply passage 96a in an openable and closable manner. In addition, the screw driving machine 1A includes a door portion <NUM>. The door portion <NUM> is integrally coupled to the magazine cap portion <NUM>. The door portion <NUM> is configured to cover a part of the opened side portion of the injection passage 12a, the opened side portion of the discharge port 12c, and the opened side portion of the supply passage 96a in an openable and closable manner.

The magazine cap portion <NUM> is an example of a lid portion. The magazine cap portion <NUM> has a shape that extends from a convex portion which can cover the screw coupling body <NUM> in a form of being wound in a spiral shape toward a side where the nose portion <NUM> is provided and covers a part of the supply passage 96b. In the magazine cap portion <NUM>, an end portion on a side opposite to a side to which the door portion <NUM> is coupled is supported by the magazine <NUM> via a support shaft 97a, so that the magazine cap portion <NUM> is rotatable with respect to the magazine <NUM> with the support shaft 97a as a fulcrum. In the magazine cap portion <NUM>, the biasing member (not illustrated) such as a torsion coil spring is inserted into the support shaft 97a, and the magazine cap portion <NUM> is biased in an opening direction with respect to the magazine <NUM>. The magazine cap portion <NUM> may be configured not to be biased by the biasing member in the opening direction with respect to the magazine <NUM>.

The door portion <NUM> is an example of the lid portion. The door portion <NUM> is supported by the magazine cap portion <NUM> via a coupling shaft 98a and is rotatable with respect to the magazine cap portion <NUM> with the coupling shaft 98a as a fulcrum. An axial direction of the coupling shaft 98a is a direction intersecting the first direction that is indicated by the arrow B. An axial direction of the support shaft 97a via which the magazine cap portion <NUM> is supported by the magazine <NUM> and the axial direction of the coupling shaft 98a via which the door portion <NUM> is supported by the magazine cap portion <NUM> are parallel.

The magazine cap portion <NUM> and the door portion <NUM> are changeable between a linearly extending form and a bent form by relative rotation thereof with the coupling shaft 98a as a fulcrum. In the door portion <NUM>, a biasing member 98b such as a torsion coil spring is inserted into the coupling shaft 98a, and the magazine cap portion <NUM> and the door portion <NUM> are biased in a bending direction. The biasing member 98b is an example of a biasing portion.

In addition, the magazine cap portion <NUM> and the door portion <NUM> are configured to open and close the side portion of the magazine <NUM>, the side portion of the supply passage 96a, the side portion of the injection passage 12a, and the side portion of the discharge port 12c by an integral rotating operation with the support shaft 97a as a fulcrum.

In the screw driving machine 1A, when the magazine cap portion <NUM> and the door portion <NUM> are in the open state, the side portion of the magazine <NUM>, the side portion of the supply passage 96a, the side portion of the injection passage 12a, and the side portion of the discharge port 12c are exposed. The side portion of the magazine <NUM>, the side portion of the supply passage 96a, the side portion of the injection passage 12a, and the side portion of the discharge port 12c open in a form of being connected along the first direction indicated by the arrow B. The screw driving machine 1A has an opening portion 12d in the side portion of the injection passage 12a and the side portion of the discharge port 12c. The opening portion 12d is formed in a form of connecting an opening in the side portion of the injection passage 12a and an opening in the side portion of the discharge port 12c along the first direction indicated by the arrow B. In the screw driving machine 1A, the opening portion 12d is exposed when the magazine cap portion <NUM> and the door portion <NUM> are in the open state. The door portion <NUM> exposes the opening portion 12d in a state where the discharge port 12c is opened.

In addition, in the screw driving machine 1A, when the magazine cap portion <NUM> and the door portion <NUM> are in the closed state, openings in the side portion of the magazine <NUM>, the side portion of the supply passage 96a, the side portion of the injection passage 12a, and the side portion of the discharge port 12c are covered. The door portion <NUM> covers the opening portion 12d in the state where the discharge port 12c is opened.

The screw driving machine 1A includes a plurality of engaging portions configured to hold the magazine cap portion <NUM> and the door portion <NUM> in a closed state where the magazine <NUM> is closed. In this example, a first engaging portion 99a and a second engaging portion 99b that hold the magazine cap portion <NUM> and the door portion <NUM> in the closed state are provided. The first engaging portion 99a is provided on the door portion <NUM> on a side that is close to the coupling shaft 98a coupled to the magazine cap portion <NUM>. The first engaging portion 99a includes an engaging convex portion 99a2, an operation portion 99a3, and a biasing member 99a4. The engaging convex portion 99a2 is configured to enter an engaged concave portion 99a1 provided in the main body portion <NUM>. The operation portion 99a3 is configured to receive an operation of inserting and removing the engaging convex portion 99a2 into and from the engaged concave portion 99a1. The biasing member 99a4 such as a coil spring is configured to bias the first engaging portion 99a in a direction in which the engaging convex portion 99a2 enters the engaged concave portion 99a1. The biasing member 99a4 is an example of a biasing portion. The first engaging portion 99a is displaced between a holding position and a releasing position. In the holding position, the first engaging portion 99a holds the door portion <NUM> and the magazine cap portion <NUM> in the closed state by the engaging convex portion 99a2 being biased by the biasing member 99a4 to enter the engaged concave portion 99a1 and being engaged with the main body portion <NUM>. In the releasing position, engagement with the main body portion <NUM> is released by separating the engaging convex portion 99a2 from the engaged concave portion 99a1 by the operation of the operation portion 99a3, whereby the first engaging portion 99a allows the door portion <NUM> and the magazine cap portion <NUM> to be openable and closable.

The second engaging portion 99b is an example of an engaging portion. The second engaging portion 99b is provided on the nose portion <NUM>. 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 the arrow A. That is, the second engaging portion 99b is provided to face both sides of the door portion <NUM> along the extending direction of the injection passage 12a indicated by the arrow A with respect to the door portion <NUM> in the closed state. In addition, the second engaging portion 99b is provided in the vicinity of the injection passage 12a. The second engaging portion 99b is entirely or partially provided on a side closer to the nose portion <NUM> than a position H1 of the most protruding portion in the second direction indicated by the arrow C in the door portion <NUM> in the closed state. Providing the second engaging portion 99b at such a position is referred to as providing the second engaging portion 99b in the vicinity of the injection passage 12a.

The door portion <NUM> has an engaging convex portion 99c engageable with the second engaging portion 99b at a tip portion 98c of the door portion <NUM>. In addition, the second engaging portion 99b has an engaging concave portion 99d with which the engaging convex portion 99c engages. The engaging convex portion 99c is an example of a convex portion. The engaging convex portion 99c is provided on both sides of the door portion <NUM> along the extending direction of the injection passage 12a indicated by the arrow A. The engaging convex portion 99c has a columnar shape protruding from the door portion <NUM> along the axial directions of the support shaft 97a and the coupling shaft 98a.

The engaging concave portion 99d is an example of a concave portion. The engaging concave portion 99d is formed by a groove portion that extends along the first direction indicated by the arrow B and has a shape into which the engaging convex portion 99c is insertable. The engaging concave portion 99d is opened on a side facing the magazine <NUM> on a side opposite to the first direction, allowing the engaging convex portion 99c to be inserted and removed. In the second engaging portion 99b, a guide portion 99e connected to the engaging concave portion 99d is provided on a side of the engaging concave portion 99d that is close to the nose portion <NUM>. The guide portion 99e is an extension portion of a surface on the side of the engaging concave portion 99d that is close to the nose portion <NUM>, and extends along the first direction. In addition, the second engaging portion 99b has an introduction portion 99f on a side of the engaging concave portion 99d that is far from the nose portion <NUM>. The introduction portion 99f is an end portion on the side of the engaging concave portion 99d that is far from the nose portion <NUM>. The introduction portion 99f is formed at a position where the introduction portion 99f enters in the first direction more than the guide portion 99e.

The magazine cap portion <NUM> and the door portion <NUM> change between the linearly extending form and the bent form by the relative rotation thereof with the coupling shaft 98a as a fulcrum, thereby changing a distance from the support shaft 97a to the engaging convex portion 99c.

A length from the support shaft 97a to the guide portion 99e is formed to be longer than the distance from the support shaft 97a to the engaging convex portion 99c when the magazine cap portion <NUM> and the door portion <NUM> change to the bent form by the relative rotation thereof with the coupling shaft 98a as a fulcrum. Accordingly, when the magazine cap portion <NUM> and the door portion <NUM> change to the bent form, the guide portion 99e is located on a rotation trajectory of the engaging convex portion 99c around the support shaft 97a. In addition, a length from the support shaft 97a to the introduction portion 99f is formed to be shorter than the distance from the support shaft 97a to the engaging convex portion 99c when the magazine cap portion <NUM> and the door portion <NUM> change to the bent form by the relative rotation thereof with the coupling shaft 98a as a fulcrum. Accordingly, when the magazine cap portion <NUM> and the door portion <NUM> change to the bent form, the introduction portion 99f is located outside the rotation trajectory of the engaging convex portion 99c around the support shaft 97a. Further, the length from the support shaft 97a to the guide portion 99e is formed to be shorter than the distance from the support shaft 97a to the engaging convex portion 99c when the magazine cap portion <NUM> and the door portion <NUM> change to the linearly extending form by the relative rotation thereof with the coupling shaft 98a as a fulcrum. Accordingly, in a state where the magazine cap portion <NUM> and the door portion <NUM> change to the bent form by the relative rotation thereof with the coupling shaft 98a as a fulcrum, even when the magazine cap portion <NUM> and the door portion <NUM> rotate with the support shaft 97a as a fulcrum, the engaging convex portion 99c does not come into contact with the introduction portion 99f. The engaging convex portion 99c is in contact with the guide portion 99e. The magazine cap portion <NUM> and the door portion <NUM> may be configured as a lid portion that is fixedly integrated, instead of being configured to be connected in a movable form via the coupling shaft 98a. In the lid portion having such a configuration, a side opposite to a side on which a portion corresponding to the door portion is provided is supported such that the lid portion is openable and closable by a rotating operation with the support shaft as a fulcrum with respect to the magazine <NUM>.

The screw driving machine 1A includes a screw detector <NUM> configured to detect presence or absence of the screw <NUM> (screw coupling body <NUM>). The screw detector <NUM> is an example of a consumable detector. The screw detector <NUM> is supported by the magazine cap portion <NUM> via a shaft 210a. The screw detector <NUM> includes a detection terminal 210b that is provided on one side across the shaft 210a. The detection terminal 210b is contactable with the screw coupling body <NUM> passing through the supply passage 96a. In addition, the screw detector <NUM> includes a confirmation portion 210c which is provided on the other side across the shaft 210a. The confirmation portion 210c is configured to protrude to an outside of the magazine cap portion <NUM> from a window portion 97b provided in the magazine cap portion <NUM> and to be retracted to an inside of the magazine cap portion <NUM>. Further, the screw detector <NUM> includes a biasing member 210d such as a coil spring configured to bias the detection terminal 210b in a direction of the supply passage 96a.

In the screw detector <NUM>, when the screw coupling body <NUM> is accommodated in the magazine <NUM>, a portion pulled out from a state of being wound in a spiral shape is passed through the supply passage 96a, and the magazine cap portion <NUM> and the door portion <NUM> are closed, the detection terminal 210b comes into contact with the screw coupling body <NUM> and is pressed. Accordingly, the screw detector <NUM> rotates with the shaft 210a as a fulcrum, and the confirmation portion 210c is retracted from the window portion 97b of the magazine cap portion <NUM> to the inside of the magazine cap portion <NUM>.

<FIG> is a cross-sectional view illustrating an example of opening and closing operations of a magazine cap portion and a door portion, <FIG> is a perspective view illustrating the example of the opening and closing operations of the magazine cap portion and the door portion. An example of opening and closing operations of the magazine cap portion <NUM> and the door portion <NUM> will be described.

As illustrated in <FIG> and <FIG>, when the magazine cap portion <NUM> and the door portion <NUM> are in the open state where the magazine <NUM> is opened, the magazine cap portion <NUM> and the door portion <NUM> change to the bent form by the relative rotation thereof with the coupling shaft 98a as a fulcrum. From this state, when the magazine cap portion <NUM> and the door portion <NUM> are caused to rotate in a closing direction with the support shaft 97a as a fulcrum, the engaging convex portion 99c of the door portion <NUM> does not come into contact with the introduction portion 99f on a nose portion <NUM> side. Then, the engaging convex portion 99c comes into contact with the guide portion 99e, and as illustrated in <FIG> and <FIG>, the engaging convex portion 99c of the door portion <NUM> moves to a position facing the engaging concave portion 99d on the nose portion <NUM> side.

From this state, when the vicinity of a portion where the magazine cap portion <NUM> and the door portion <NUM> are coupled by the coupling shaft 98a is pressed in a direction in which the magazine cap portion <NUM> and the door portion <NUM> are in the linearly extending form, the engaging convex portion 99c of the door portion <NUM> moves along the guide portion 99e on the nose portion <NUM> side. Accordingly, the engaging convex portion 99c is guided by the guide portion 99e to enter the engaging concave portion 99d and further moves along the engaging concave portion 99d. When the magazine cap portion <NUM> and the door portion <NUM> are closed, the engaging concave portion 99d causes the door portion <NUM>, which is bent with the coupling shaft 98a as a fulcrum with respect to the magazine cap portion <NUM>, to extend linearly against a biasing force of the biasing member 98b. When the magazine cap portion <NUM> and the door portion <NUM> are in the open state, the first engaging portion 99a is engaged with the main body portion <NUM> and moves to the holding position that holds the door portion <NUM> and the magazine cap portion <NUM> in the closed state.

Accordingly, when the magazine cap portion <NUM> and the door portion <NUM> are in the closed state, the magazine cap portion <NUM> and the door portion <NUM> are in the linearly extending form, and a side of the door portion <NUM> that is close to the coupling shaft 98a coupled to the magazine cap portion <NUM> is held in the closed state by the first engaging portion 99a. In addition, the tip portion 98c, which is a side that is close to the nose portion <NUM> opposite to the coupling shaft 98a coupled to the magazine cap portion <NUM> in the door portion <NUM>, is held in the closed state by the second engaging portion 99b by the engagement between the engaging convex portion 99c and the engaging concave portion 99d.

In order to open the magazine cap portion <NUM> and the door portion <NUM>, the first engaging portion 99a is moved to the releasing position that releases the engagement with the main body portion <NUM> to open and close the door portion <NUM> and the magazine cap portion <NUM>. When holding in the closed state by the first engaging portion 99a is released, the magazine cap portion <NUM> and the door portion <NUM> change to the bent form by the relative rotation thereof with the coupling shaft 98a as a fulcrum by biasing of the biasing member (not illustrated).

When the magazine cap portion <NUM> and the door portion <NUM> change from the closed state to the bent form, the engaging convex portion 99c of the door portion <NUM> moves to an outside of the introduction portion 99f and is guided by the guide portion 99e, thereby moving to a position where the engaging convex portion 99c is separated from the engaging concave portion 99d on the nose portion <NUM> side. As a result, the magazine cap portion <NUM> and the door portion <NUM> can be in the open state by the rotating operation with the support shaft 97a as a fulcrum.

<FIG> is a side sectional view of the screw driving machine illustrating an example of an operation of driving a screw into a driven member and tightening the screw, and <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, and <FIG> are front sectional views of the screw driving machine illustrating examples of an operation of driving the screw into the driven member and tightening the screw. In addition, <FIG> is a bottom sectional view of the screw driving machine illustrating an example of a state where the screw in the magazine is used.

Next, an example of an operation of the screw driving machine 1A in which the driving and tightening of the screw <NUM> are performed will be described.

In the screw driving machine 1A, the operator holds the handle portion <NUM>, and the contact arm <NUM> is pressed against the driven member <NUM>. In the screw driving machine 1A, when the contact arm <NUM> is pressed against the driven member <NUM>, the lower arm <NUM> moves in the upward direction due to the relative movement with respect to the main body portion <NUM>.

By the operation of the contact arm <NUM> in which the lower arm <NUM> moves in the upward direction due to the relative movement with respect to the main body portion <NUM>, the upper arm (not illustrated) of the contact arm <NUM> moves to a position where the contact lever 60a of the trigger <NUM> is caused to operate. Accordingly, when the operation of pulling the trigger <NUM> is performed, as illustrated in <FIG>, the contact lever 60a presses the valve stem <NUM> of the start valve <NUM>, and the start valve <NUM> is operated.

When the start valve <NUM> is operated, the main valve <NUM> is operated as illustrated in <FIG>, and the compressed air is supplied to the driving cylinder <NUM> and the on-off valve <NUM>. When the compressed air is supplied to the driving cylinder <NUM>, the driving piston 30a to which the driver bit <NUM> is attached is pressed by the air pressure, and as illustrated in <FIG>, the driver bit <NUM> (driving piston 30a) moves in the downward direction from the top dead center position to the bottom dead center position, and the screw <NUM> is driven into the driven member <NUM>.

When the driver bit <NUM> (driving piston 30a) moves in the downward direction from the top dead center position, air on the lower side of the driving piston 30a is supplied to the blowback chamber <NUM>, and pressure in the blowback chamber <NUM> increases.

When the driver bit <NUM> (driving piston 30a) moves to the bottom dead center position, the compressed air in the blowback chamber <NUM> is supplied from the feed flow path <NUM> of the screw feeding portion <NUM> to the feed piston <NUM>. Accordingly, the feeding member <NUM> moves in a direction separating from the injection passage 12a. In the operation of the feeding member <NUM> moving in the direction separating from the injection passage 12a, the feeding member <NUM> is separated from the coupling band <NUM>, and the screw coupling body <NUM> is not fed.

When the main valve <NUM> is operated and the compressed air is supplied to the on-off valve lower chamber 73a of the on-off valve cylinder <NUM> which is a space on the lower side of the on-off valve <NUM>, as illustrated in <FIG>, the on-off valve <NUM> is operated by the air pressure, and the compressed air is supplied to the air motor <NUM>.

When the compressed air is supplied to the air motor <NUM>, the driver bit <NUM> rotates, and as illustrated in <FIG>, the screw <NUM> driven into the driven member <NUM> is tightened. In addition, by the operation of pressing the contact arm <NUM> against the driven member <NUM>, the main body portion <NUM> further moves in the downward direction following the tightening of the screw <NUM>.

By the operation of pressing the contact arm <NUM> against the driven member <NUM>, the main body portion <NUM> further moves in the downward direction following the tightening of the screw <NUM>, and the lower arm <NUM> moves relatively in the upward direction. When the lower arm <NUM> moves relatively in the upward direction, the tightening depth adjusting portion <NUM> is pressed in the upward direction. When the tightening depth adjusting portion <NUM> is pressed up by the lower arm <NUM> moving in the arrow U direction and the tightening depth adjusting portion <NUM> moves to a position where the tightening depth adjusting portion <NUM> comes into contact with the movement regulating portion 86e, the lower arm <NUM> is regulated from further moving in the upward direction. Accordingly, a position of the lower arm <NUM> regulated by the movement to the position where the tightening depth adjusting portion <NUM> comes into contact with the movement regulating portion 86e becomes the upper fulcrum position of the lower arm <NUM>. When the lower arm <NUM> moves to the top dead center position, as illustrated in <FIG>, the lower arm <NUM> presses the first control valve <NUM> in the upward direction via the tightening depth adjusting portion <NUM>, and the first control valve <NUM> moves from the standby position P100 illustrated in <FIG> and the like to a pressure control start position P101.

In the control valve cylinder <NUM>, the third chamber 75a is normally in communication with the space in the driving cylinder <NUM> via the communication passage 75c and the side hole flow path 32a of the driving cylinder <NUM>. When the main valve <NUM> is operated and the seal portion 30b of the driving piston 30a passes through the side hole flow path 32a, the compressed air is supplied from the second chamber 30d in the driving cylinder <NUM>, which is an upper chamber of the driving cylinder, to the timer chamber <NUM>. During a period in which the first control valve <NUM> moves to the pressure control start position P101 from a state where the first control valve <NUM> stands by at the standby position P100, the seal portion 72c of the first control valve <NUM> is at a position where the exhaust passage 75d is opened, and the third chamber 75a of the control valve cylinder <NUM> is in communication with the outside of the body of the screw driving machine 1A via the exhaust passage 75d. Accordingly, even when the compressed air is supplied from the timer chamber <NUM> to the third chamber 75a of the control valve cylinder <NUM>, the third chamber 75a is maintained at atmospheric pressure, and the first control valve <NUM> does not operate with the air pressure.

When the first control valve <NUM> moves to the pressure control start position P101, the seal portion 72c of the first control valve <NUM> closes the exhaust passage 75d. When the air flow path to an outside of a gas passing through the exhaust passage 75d is blocked, pressure in the control valve cylinder <NUM> increases due to the air pressure of the compressed air supplied from the timer chamber <NUM> to the third chamber 75a of the control valve cylinder <NUM>. When the pressure in the control valve cylinder <NUM> increases, the first control valve <NUM> is operated due to the air pressure, and as illustrated in <FIG>, the first control valve <NUM> further moves in the upward direction.

When the first control valve <NUM> further moves in the upward direction from the pressure control start position P101 due to the air pressure of the compressed air and the first control valve <NUM> moves to the second control valve operation start position, the first control valve <NUM> presses the second control valve <NUM> in the upward direction. When the second control valve <NUM> moves to an operation completion position P111 by movement of the first control valve <NUM> to an operation completion position P102, the compressed air is supplied to the on-off valve upper chamber 73b of the on-off valve cylinder <NUM> which is a space on the upper side of the on-off valve <NUM>.

When the compressed air is supplied to the on-off valve upper chamber 73b, the on-off valve <NUM> moves in the downward direction as illustrated in <FIG> due to a difference between pressure acting on the on-off valve <NUM> due to the compressed air supplied to the on-off valve upper chamber 73b and pressure acting on the on-off valve <NUM> due to the compressed air supplied to the on-off valve lower chamber 73a, and supply of the compressed air to the air motor <NUM> is stopped. When the supply of the compressed air to the air motor <NUM> is stopped, rotation of the driver bit <NUM> is stopped.

When the rotation of the driver bit <NUM> is stopped and the tightening of the screw <NUM> is completed, the operator weakens the force for pressing the contact arm <NUM> against the driven member <NUM> and causes the main body portion <NUM> to move in a direction separating from the driven member <NUM>.

When the main body portion <NUM> moves in the direction separating from the driven member <NUM>, the pressing of the contact lever 60a by the upper arm (not illustrated) is released, and the contact lever 60a is separated from the start valve <NUM>. When the contact lever 60a is separated from the start valve <NUM>, the main valve <NUM> is closed, and the supply of the compressed air to the driving cylinder <NUM> is stopped.

When the supply of the compressed air to the driving cylinder <NUM> is stopped and the pressure in the driving cylinder <NUM> decreases to the atmospheric pressure, the compressed air in the blowback chamber <NUM> is supplied to a space on the lower side of the driving piston 30a, and the driver bit <NUM> (driving piston 30a) moves to the top dead center position.

When the driver bit <NUM> moves to the top dead center position and the pressure in the blowback chamber <NUM> decreases, the supply of the compressed air to the feed piston <NUM> is stopped. When the supply of the compressed air to the feed piston <NUM> is stopped, the feeding member <NUM> coupled to the feed piston <NUM> moves in a direction approaching the injection passage 12a by the biasing of the biasing member <NUM>. In the operation of the feeding member <NUM> moving in the direction approaching the injection passage 12a, the feeding member <NUM> is engaged with the coupling band <NUM>, and a next screw <NUM> is fed to the injection passage 12a.

In the operation of feeding the next screw <NUM> to the injection passage 12a, the coupling band <NUM> after the screw <NUM> is injected is discharged from the discharge port 12c to the outside of the nose portion <NUM>.

In a case where the screw coupling body <NUM> remains in the magazine <NUM> in the operation of feeding the next screw <NUM> to the injection passage 12a, the screw coupling body <NUM> pulled out from a portion wound in a spiral shape in the magazine <NUM> is passed through the supply passage 96a. In addition, even in a case where the screw coupling body <NUM> is removed from the magazine <NUM>, the screw coupling body <NUM> comes into contact with the detection terminal 210b until a terminal of the screw coupling body <NUM> passes through the detection terminal 210b of the screw detector <NUM>.

As described above, in a case where the predetermined number of screws <NUM> that do not pass through the detection terminal 210b of the screw detector <NUM> remain in the supply passage 96a at the terminal of the screw coupling body <NUM>, in the screw detector <NUM>, the detection terminal 210b comes into contact with the screw coupling body <NUM> and is pressed as illustrated in <FIG>. Accordingly, the screw detector <NUM> rotates with the shaft 210a as a fulcrum, and the confirmation portion 210c is retracted from the window portion 97b of the magazine cap portion <NUM> to the inside of the magazine cap portion <NUM>. Thus, the operator can confirm that the predetermined number of screws <NUM> remain by visually checking the window portion 97b of the magazine cap portion <NUM> or by touching with a hand.

On the other hand, as illustrated in <FIG>, in a case where the screw <NUM> is used until the terminal of the screw coupling body <NUM> passes through the detection terminal 210b of the screw detector <NUM>, the detection terminal 210b of the screw detector <NUM> is separated from the screw coupling body <NUM>. Accordingly, the screw detector <NUM> is biased by the biasing member 210d and rotates with the shaft 210a as a fulcrum, and the confirmation portion 210c protrudes from the window portion 97b of the magazine cap portion <NUM> to an outside of the magazine cap portion <NUM>. Thus, the operator can confirm that the number of remaining screws <NUM> is equal to or less than the predetermined number before the screws <NUM> are removed by visually checking the confirmation portion 210c protruding from the window portion 97b of the magazine cap portion <NUM> or by touching with a hand. Accordingly, it is possible to select an executable operation according to the remaining number of the screws <NUM>.

In the screw driving machine 1A, the magazine cap portion <NUM> and the door portion <NUM> are integrally coupled to open and close the magazine <NUM>. When the magazine cap portion <NUM> and the door portion <NUM> are in the open state, the side portion of the magazine <NUM>, the side portion of the supply passage 96a, the side portion of the injection passage 12a, and the side portion of the discharge port 12c are exposed. Accordingly, in a case where the screw coupling body <NUM> is to be loaded, a task of accommodating the screw coupling body <NUM> wound in a spiral shape in the magazine <NUM> and inserting the screw coupling body <NUM> pulled out from the portion wound in a spiral shape into the supply passage 96a from the lateral side can be easily performed. In addition, the task of inserting the screw coupling body <NUM> into the supply passage 96a can be easily performed by aligning a position of the screw <NUM> with the injection passage 12a.

In the related art, a configuration is provided in which a magazine cap portion provided in a magazine and a door portion provided in a nose portion are opened and closed, respectively. Therefore, the door portion provided in the nose portion is configured to be opened and closed by a rotating operation with a shaft provided in the nose portion as a fulcrum. In contrast, in the screw driving machine 1A, the magazine cap portion <NUM> and the door portion <NUM> are integrally coupled to open and close the magazine <NUM>. In the magazine cap portion <NUM>, the end portion on the side opposite to the side to which the door portion <NUM> is coupled is supported by the magazine <NUM> via the support shaft 97a. Thus, in the screw driving machine 1A, as illustrated in <FIG>, when the magazine cap portion <NUM> and the door portion <NUM> are in the open state, the opening portion 12d is exposed, the opening portion 12d being formed in a form in which the opening in the side portion of the injection passage 12a and the opening in the side portion of the discharge port 12c are connected along the first direction indicated by the arrow B. When the door portion <NUM> is in the open state, the opening portion 12d is exposed in a form of being connected to the discharge port 12c.

Accordingly, in a case where an unused screw coupling body <NUM> is to be loaded, the tape <NUM> of a portion protruding out from a tip of the screw coupling body <NUM> can be inserted into the opening portion 12d from the lateral side without peeling off the entire tape <NUM> fixing the screw coupling body <NUM>.

In a case where the screw coupling body <NUM> in use is to be taken out, the screw coupling body <NUM> before injection of the screw <NUM> pulled out from the portion wound in a spiral shape can be taken out from the lateral side of the supply passage 96a. Further, the coupling band <NUM> after the screw <NUM> is injected can be taken out from the lateral side of the opening portion 12d. Accordingly, in the case where the screw coupling body <NUM> in use is to be taken out, the screw coupling body <NUM> can be taken out from the magazine <NUM> without separating the coupling band <NUM> after the screw <NUM> is injected.

Further, in a case where the screw coupling body <NUM> in use is to be loaded, the coupling band <NUM> after the screw <NUM> is injected can be inserted into the opening portion 12d from the lateral side. Accordingly, in the case where the screw coupling body <NUM> in use is to be loaded, the screw coupling body <NUM> can be loaded into the magazine <NUM> without separating the coupling band <NUM> after the screw <NUM> is injected.

In the screw driving machine 1A, when the magazine cap portion <NUM> and the door portion <NUM> are in the closed state, the openings in the side portion of the magazine <NUM>, the side portion of the supply passage 96a, the side portion of the injection passage 12a, and the side portion of the discharge port 12c are covered with the magazine cap portion <NUM> and the door portion <NUM>, and the opening portion 12d is covered with the magazine cap portion <NUM> and the door portion <NUM>. In addition, the door portion <NUM> covers the opening portion 12d in the state where the discharge port 12c is opened. Accordingly, the supply passage 96b can be formed in a form in which the coupling band <NUM> after the screw <NUM> is injected can be discharged from the discharge port 12c to the outside of the nose portion <NUM>.

As described above, the magazine cap portion <NUM> and the door portion <NUM> are integrally coupled by the coupling shaft 98a, the magazine cap portion <NUM> and the door portion <NUM> are integrally opened, and the opening portion 12d is exposed, so that the screw coupling body <NUM> is easily loaded.

In a case where the screw coupling body <NUM> is clogged in the supply passage 96a due to the operation of feeding the screw coupling body <NUM> by the screw feeding portion <NUM>, a load is applied to the openable and closable door portion <NUM>.

On the other hand, in the screw driving machine 1A, when the magazine cap portion <NUM> and the door portion <NUM> are in the closed state, the side of the door portion <NUM> that is close to the coupling shaft 98a coupled to the magazine cap portion <NUM> is held in the closed state by the first engaging portion 99a. In addition, the side that is close to the nose portion <NUM> is held in the closed state by the second engaging portion 99b by the engagement between the engaging convex portion 99c and the engaging concave portion 99d.

Accordingly, in the configuration in which the magazine cap portion <NUM> and the door portion <NUM> are integrally coupled by the coupling shaft 98a, the door portion <NUM> can ensure the same strength as that of a door portion in a configuration in which a magazine cap portion and a door portion are separately opened and closed.

In the screw driving machine 1A, the magazine cap portion <NUM> and the door portion <NUM> are integrally coupled by the coupling shaft 98a, so that the magazine cap portion <NUM> and the door portion <NUM> change between the linearly extending form and a bent form by the relative rotation thereof with the coupling shaft 98a as a fulcrum.

Further, the screw driving machine 1A is configured such that the second engaging portion 99b includes the engaging convex portion 99c in the door portion <NUM> and the engaging concave portion 99d in the nose portion <NUM>, and the guide portion 99e extending from the engaging concave portion 99d to the side facing the magazine <NUM> is provided, allowing the engaging convex portion 99c to be inserted into and removed from the engaging concave portion 99d using the guide portion 99e as a guide.

Accordingly, in the second engaging portion 99b, when the magazine cap portion <NUM> and the door portion <NUM> are caused to change from the bent form to the linearly extending form, the engaging convex portion 99c enters the engaging concave portion 99d using the guide portion 99e as a guide, the engaging convex portion 99c further moves along the engaging concave portion 99d, the engaging convex portion 99c and the engaging concave portion 99d engage with each other, and the magazine cap portion <NUM> and the door portion <NUM> are brought into the closed state.

Therefore, as compared to the configuration in which the magazine cap portion provided in the magazine and the door portion provided in the nose portion are independently opened and closed, since the magazine cap portion <NUM> and the door portion <NUM> can be integrally opened and closed, the operation of opening and closing the magazine <NUM> by the magazine cap portion <NUM> and the door portion <NUM> is easy. In addition, it is possible to prevent generation of a load due to the engagement between the engaging convex portion 99c and the engaging concave portion 99d by the operation of bringing the magazine cap portion <NUM> and the door portion <NUM> into the closed state.

Claim 1:
A handheld tool (1A) comprising:
a nose portion (<NUM>) having an injection passage (12a) for a fastener;
a magazine (<NUM>) configured to accommodate the fastener and located in an intersecting direction intersecting with the injection passage;
a magazine cap portion (<NUM>) including a tip portion and a base end portion, the base end portion being located opposite to the tip portion in the intersecting direction, the magazine cap portion being configured to open and close the magazine by the tip portion separating from and approaching the magazine, the tip portion being rotatable in a direction separating from and approaching the magazine with the base end portion as a fulcrum; characterized by
a door portion (<NUM>) rotatably coupled to the tip portion of the magazine cap portion via a coupling shaft (98a),
wherein the nose portion includes an engaging portion (99a,99b) engageable with the door portion, and
wherein the door portion is configured to:
in a state where the magazine cap portion is opened, bent toward the magazine with the coupling shaft as a fulcrum; and
in a state where the magazine cap portion is closed, extend linearly and engage with the engaging portion.