Yamabiko Corporation

Iida Denki Kogyo Co., Ltd.

Lida Denki Kogyo Co., Ltd.

Hiroyuki Miyaki

Akira Yamazaki

Kosuke Matsumoto

Shiro Yamaguchi

Takamasa Otsuji

A chainsaw includes a chain tension mechanism. The chain tension mechanism includes: an adjustment dial made of resin and rotatable about an axis in a right-left direction; a rotation transmission member made of metal and rotatable about an axis in the right-left direction; a feed screw member made of metal and rotatable about an axis in a front-rear direction; and a slide member coupled to a guide bar. The slide member is screwed to the feed screw member. A first gear of the adjustment dial is meshed with a second gear of the rotation transmission member, and a first bevel gear of the rotation transmission member is meshed with a second bevel gear of the feed screw member.

Chainsaw

An engine-driven working machine includes a controller, which varies a control value of a solenoid valve so as to decrease or increase an opening degree of the solenoid valve when a rotating speed of an engine is within a predetermined high rotating speed range and the rotating speed of the engine is lower or higher than a predetermined rotating speed, respectively. When the control value of the solenoid valve is varied so as to decrease the opening degree of the solenoid valve and corresponds to a predetermined opening degree larger than a fully-closed state, the control value is set to a limitation value.

Handheld engine-driven working machine

An engine-driven working machine includes a controller, which varies a control value of a solenoid valve so as to decrease or increase an opening degree of the solenoid valve when a rotating speed of an engine is within a predetermined high rotating speed range and the rotating speed of the engine is lower or higher than a predetermined rotating speed, respectively. In case the controller determines that the engine-driven working machine gets started saw cutting, the controller stops varying the control value of the solenoid valve when the rotating speed of the engine is within the predetermined high rotating speed range and lower than the target rotating speed.

Growing community of inventors

Ohme, Japan

Hiroyuki Miyaki