Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Masashi Nishida

Yoshinori Ishizawa

Hiroki Kitagawa

Tetsuhito Shige

Yoshiichi Komazaki

Daiki Kiyohara

Masaya Nagao

Takeshi Saitou

Shouichi Hirai

Kousuke Akutsu

Masato Sakai

Takeshi Taniguchi

Yoshimitsu Iijima

Masaaki Furumi

A driver capable of suppressing increase in a load torque of a motor when a striking mechanism is moved by the torque of the motor against a force of a first moving mechanism is provided. The driver includes a striking mechanismmovable in a first direction Band a second direction Bopposite to the first direction Band a first moving mechanism configured to move the striking mechanismin the first direction Bto strike a fastener, and the driver further includes a motor, a second moving mechanismrotated by the torque of the motor and configured to move the striking mechanismin the second direction against a force of the first moving mechanism, and torque suppression mechanismsA toH configured to suppress increase in the torque of the motor when the striking mechanismis moved in the second direction B

Driver, striking mechanism, and moving mechanism

Provided is a driving machine capable of stabilizing a relationship between timing when a first movable member starts operating in a first directing and timing when a second movable member starts operating in a second direction. The driving machine including a first movable memberoperable in a first direction Dand a second direction D, and a second movable memberoperable in the first direction Dand the second direction Dhas a first regulating mechanism, a second regulating mechanism, and a third regulating mechanism, and the third regulating mechanism is held in a first state when the first movable memberis prevented from operating in the first direction D, and the third regulating mechanismswitches from the first state to the second state when the first movable memberis allowed to operate in the first direction Dand operates.

Driving machine

The present invention is to prevent a drive-in position of a fastening member with respect to a material to be driven from being shifted. The drive-in machine according to the present invention comprises: an operation member; a contact member; a striking portion; and a first pressure chamber, the drive-in machine further comprising: a valve element for opening and closing a first passage through which a compressed fluid is sent to the first pressure chamber; a control mechanism having a first state and a second state in which the valve element is controlled; and a restriction mechanism for allowing and restricting the switching between the first state and the second state of the control mechanism. The restriction mechanism has first and second functions for allowing or restricting the control mechanism to be switched from the second state to the first state according to a time from a reference time point.

Drive-in machine

A driving machine is provided to prevent clogging of a fastener in an ejection passage without increasing the total length of the ejection passage. A nail driving machine includes: a nose part forming an upper portion of an ejection passage through which a nail passes; a contact part being slidable along the nose part and forming a lower portion of the ejection passage; a driver blade striking a head part of the nail supplied to the ejection passage; and a guide part disposed in a lower portion of the nose part and guiding the nail passing through the ejection passage. The guide part has a guide surface inclining to protrude from a radial outer side toward a radial inner side of the ejection passage. A housing groove is formed in the contact part and the guide part enters the housing groove when the contact part slides along the nose part.

The nailing machine () comprises an air passage () allowing communication between a cylinder () and a return air chamber () in which compressed air for returning a piston () to the initial position is accumulated. The air passage () is provided with a control valve () controlling entry of compressed air into the return air chamber () from the cylinder (). The control valve () opens the air passage () and allows entry of compressed air into the return air chamber () in the case wherein the nailed object produces a small reaction force upon driving the nail, namely when the upward moving distance of the body () relative to the push lever () is smaller than a predetermined distance. The compressed air that has entered the return air chamber () further enters a below-the-piston chamber and serves as air damper, reducing the driving force.

Pneumatic driving machine

The nailing machine () comprises an air passage () allowing communication between a cylinder () and a return air chamber () in which compressed air for returning a piston () to the initial position is accumulated. The air passage () is provided with a control valve () controlling entry of compressed air into the return air chamber () from the cylinder (). The control valve () opens the air passageand allows entry of compressed air into the return air chamber () in the case wherein the nailed object produces a small reaction force upon driving the nail, namely when the upward moving distance of the body () relative to the push lever () is smaller than a predetermined distance. The compressed air that has entered the return air chamber () further enters a below-the-piston chamber and serves as air damper, reducing excess energy absorbed by a piston bumper ().

A clearance is set between a nail feeder and an outer profile portion so that the nail feeder can turn. A pin as a first restriction member that inhibits movement of the nail feeder to an ejection portion by engaging with the nail feeder and can release the engagement with the rotation of the nail feeder is provided to the outer profile portion. The position at which the nail feeder and a spring engage is set in deviation from the position at which the nail feeder and the pin engage, in a reciprocating direction of the nail feeder and in a vertical direction.

Fastener driving tool

According to an aspect of the present invention, there is provided a driving machine including: a driver blade for striking a fastener formed into an U-shape; a nose in which a launching passage is formed; and a magazine for feeding the fastener into the launching passage, wherein the magazine has a feeder for urging the multiple fasteners toward the launching passage, and the feeder has first and second convex sections each making contact with and urging respective needle of the U-shaped fastener; the nose has a blade guide for slidably guiding the driver blade; and the blade guide has first and concave sections for accommodating the first and second convex sections, the first and second concave sections being disposed alternately in the sliding direction of the driver blade.

A fastener driving tool includes a frame defining therein an accumulator that accumulates compressed air, a cylinder, a piston movable between a top dead center and a bottom dead center, a main valve section having a main valve movable between a top dead center and a bottom dead center to alternately open and block fluid communication between a piston upper chamber and the accumulator, a trigger valve section having a plunger movable between a top dead center and a bottom dead center so as to alternately open and block fluid communication from the accumulator to a main valve chamber, and fluid communication from the main valve chamber to atmosphere, and a trigger adapted to press the plunger when operated by a user. The piston moves from the top dead center to the bottom dead center within 11.3 msec when the plunger is pressed.

Pneumatically operated fastener driving tool

A fastener driving tool includes: a driver blade which is driven by compressed air so as to move in a vertical direction for striking a fastener such as a nail, an injection hole which guides said driver blade and forms a passage for the compressed air to be exhausted along with the movement of the driver blade, and a magazine for supplying the fastener to said injection hole, wherein an exhaust passage through which an interior of the injection hole is communicated with the atmosphere is provided between a lower end of the driver blade when the driver blade is positioned at a top dead center and a head part of the fastener which has been supplied into the injection hole.

A fastener driving tool having a magazine device including a magazine and a nail feeder. The magazine extends in a first direction and defines an accommodation portion for accommodating therein a fastener array. Each fastener has a shaft with a sharp-end and a head connected to the shaft. The plurality of fasteners are directed in a second direction perpendicular to the first direction and positioned side by side to form the fastener array extending in the first direction. The magazine has one end and another end in the second direction. One end is close to the sharp end of the fastener and another end is close to the head of the fastener. The accommodation portion includes an expanding portion having a width in a third direction perpendicular to the first direction and to the second direction. The width is gradually increased from the one end toward the other end.

Fastener driving tool and magazine device

A cylinder is constituted such that the cylinder includes a large diameter portion constituted by forming a portion thereof brought into contact with an O ring by a diameter larger than a diameter of other portion when a piston is disposed at an upper dead center and a small diameter portion formed downward from the large diameter portion, and a fastening margin is provided between an outer periphery of the O ring and an inner periphery of the cylinder even when the piston is disposed at any position from the upper dead center to a lower dead center and a clearance is provided between an inner periphery of the O ring and an outer periphery of a groove.

A magazine cover is integrally molded with a return-preventing claw part to be engaged with a fastener loaded into a guide part. The return-preventing claw part is so constructed as to include: a return preventing surface that abuts against the fastener to prevent the fastener from moving to a loading port; and a support portion that always makes the return preventing surface abut against the fastener, thereby being deformed, to support the return preventing surface such that the return preventing surface can be retracted to a position where the return preventing surface does not abut against the fastener.

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Ibaraki, Japan

Masashi Nishida