Hitachi Koki Co., Ltd.

Koki Holdings Co., Ltd.

Hiromi Ozawa

Nobuhiro Takano

Kazuhiko Funabashi

Hiroyuki Saitou

Eisaku Oka

Hideyuki Tanimoto

Chikai Yoshimizu

Hideaki Terashima

Shigeharu Ushiwata

Ryuichi Imamura

Yoshikazu Kawano

Tomoyuki Kawahara

Kenrou Ishimaru

Toshihiko Hayashizaki

Kouji Takase

Yasushi Nakano

Yuki Horie

Hirohisa Tomita

Yuuichi Toyoshima

Yoshihiro Hoshi

Hirohide Kawada

Ryuuichi Imamura

When a main switch () is turned ON, an electric operating machine () is put in the standby mode. With a trigger () being pulled in the standby mode, a power supply circuit () applies a voltage to a drive part (). The power supply circuit () adjusts the voltage applied to the drive part () for a voltage corresponding to the pulling rate of the trigger (). When the current running toward the drive part () exceeds the rated value of the drive part (), the power supply circuit () automatically stops power supply to the drive part (). On the other hand, when the output voltage of a battery () drops and the battery () is put in an overdischarge state, power supply to the drive part () is automatically stopped. When it is detected that the battery () undergoes an abnormal event, power supply to the drive part () is automatically stopped.

Electric operating machine

An electric working machine including: a motor; a control unit configured to control rotation of the motor; a fixed part provided with a handle having a grip portion; a movable part held by the fixed part and is configured to be extendible by sliding relative to the fixed part; and a cutting blade provided to a end portion of the movable pipe and is configured to be driven by the motor; characterized in that the electric working machine further includes a detection unit which is connected to the control unit and is configured to detect whether or not the movable part is positioned at a predetermined extended position relative to the fixed part.

Electric working machine

An electric grasscutter includes a motor () which drives a rotary blade (). The motor () is a brushless motor accommodated in a motor housing () and including a rotor () provided integrally with an output shaft (), and a stator () fixed to the motor housing (). A motor control circuit which drives the motor () is accommodated in the motor housing (). The motor control circuit includes an inverter having FETs (-) as switching elements, and a control section to control the FETs (-). The FETs (-) are fixed in contact with the motor housing ().

Work machine and brushless motor

A motor has an output shaft which is rotatably supported by a housing, a rotor which is fixed to the output shaft and which comprises a printed-wiring board, and a stator which is fixed to the housing and which comprises a magnet facing the rotor. The printed-wiring board comprises a coil/commutator disk and a coil disk. A commutator conductor pattern is formed in a commutator region of the coil/commutator disk. Likewise, coil conductor patterns are formed in respective coil regions of the coil/commutator disk and of the coil disk.

Electric motor having an output shaft rotatably supported by a housing and working machine including the same

A miter saw having good workability without decrease in angle visibility is disclosed. The miter saw includes a display unit provided on a turntable. The display unitis positioned between an operating handle protruding outward from the turntable and a rotation axis of the turntable. The display unit is positioned below the upper surfaces of a base and the turntable not so as to protrude above the upper surface of the turntable. The display unit displays an inclination angle of a circular saw blade with respect to the upper surface of the base and a rotation angle of the turntable with respect to the base in a line.

Miter saw

A miter saw including a base, a turntable, a support section extending from the turntable, and a circular saw unit supported to the support section. An adjustment mechanism is provided between the base and the turntable for performing fine-adjustment to the rotation angle of the turntable relative to the base. The adjustment mechanism is located at a front side of the turntable, and a digital display is provided near the adjustment mechanism for displaying the rotation angle.

Miter saw having angle adjustment mechanism

A digital miter saw for cutting a workpiece includes a base, a member supported on the base and moveable relative to the base, and a cutting member moveable with the member. A detector is provided for detecting at least one of a miter angle and a bevel angle between the cutting member and the workpiece, and for outputting a signal indicative of the at least one detected angle, and a digital controller is provided which has an interface operable to receive the signal.

Miter saw for displaying angle of cutter blade cutting workpiece

A miter saw having a cutting portion movable toward and away from a base and laterally tiltable for bevel cutting. A gear case is provided at the cutting portion and is positioned at one lateral side of the cutting portion. A bearing holder is provided in the gear case for holding a bearing which rotatably supports a spindle for a circular saw blade. The bearing holder has a thickness smaller than an axial length of the bearing. A first bearing nip member in contact with one axial end of the bearing is fixed to one side of the bearing holder, and a second bearing nip member in contact with another axial end of the bearing is fixed to another side of the bearing holder. These nip members are made from a material having a mechanical strength higher than that of the bearing holder.

Miter saw having compact gear case at cutting portion

A miter saw having a laterally tiltable cutting portion and a fence unit that supports a workpiece without mechanical interference with the cutting portion regardless of its laterally tilting posture. A left fence unit and a right fence unit are provided on a base portion. The left fence includes a fixed left fence, a first left subordinate fence pivotally movably connected to the fixed left fence, and a second left subordinate fence pivotally movably connected to the fixed left fence. The first left subordinate fence is moved to a first position outside of a first titling region of the cutting portion, and to a second position outside of the first tilting region and a second tilting region in which a tilting angle of the cutting portion is greater than that in the first tilting region.

Miter saw having fence unit

A miter saw including a base, turntable, and circular saw unit supported to the turntable. A turntable is rotatable about its axis. The turntable has a tilting motion support. A support section has a tilt section tiltingly movable relative to the tilt motion support, and pivotally movably supports the circular saw unit. A clamp shaft is provided for clamping the tilting section to the tilt motion support. A tilt amount fine control unit is provided for performing fine control to the tilting angle, and includes an arcuate gear teeth section provided at the tilt motion support, rotation shaft for moving the arcuate gear teeth, and adjustment knob supported on the clamp shaft for rotating the rotation shaft. A neck table section is provided at a front side of the turntable, and includes a digital display for displaying a lateral tilting angle of the circular saw unit.

Miter saw having mechanism for adjusting tilting angle of circular saw blade

A miter saw for displaying angle of a cutter blade cutting the workpiece. The miter saw has a base mounting a workpiece thereon, a movable member movably supported to the base, and a cutting unit connected to the movable member for supporting the cutter blade. A positioning portion is associated with the movable member and provides a predetermined nominal position of the movable member with respect to the base. The predetermined nominal position includes a reference position and other positions labeled angle. A detector detects the position of the movable member with respect to the base. A processor sets an angle between the reference position and the predetermined nominal position as a displayed moving amount when the movable member is positioned at the predetermined nominal position. Otherwise, the processor computes the moving amount based on the output signal from the detector.

The vice device includes a vice holder composed of two side parts connected together at a given angle and, in these two side parts of the vice holder , there are respectively formed two holes which extend at right angles to their associated side parts. By selectively switching these holes over to each other, the pressing direction of a vice plate can be changed.

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Hitachinaka, Japan

Hiromi Ozawa