Title:
CHAIN SAW
Document Type and Number:
WIPO Patent Application WO/2016/175053
Kind Code:
A1
Abstract:
The purpose of the present invention is to obtain a chain saw with which appropriate action can be performed when performing dressing work. An operator operates a throttle lever and by maximizing the extent of said operation, the drive state is initiated, and the crank shaft rotation rate R increases and reaches the maximal value RC thereof. Subsequently, the operator operates the dressing operation lever so as to be in a second state at elapsed time t0 while keeping the extent of the throttle lever operation maximized. Because a microswitch is thereby turned off, the crank shaft rotation rate R is controlled in a range of R1 < R < R2. By placing the saw chain in contact with a grindstone that is fixed to the dressing operation lever simultaneously with said action, dressing work is performed. After the microswitch is turned off at elapsed time t0, the output of an ignition coil is controlled cyclically by a control unit at a cycle T1+T2 so as to be on (ignition) during period T1 and off (flame off) during period T2.
Inventors:
NAGANUMA KENJI (JP)
SAGAWA KOUJI (JP)
SAGAWA KOUJI (JP)
Application Number:
PCT/JP2016/062113
Publication Date:
November 03, 2016
Filing Date:
April 15, 2016
Export Citation:
Assignee:
HITACHI KOKI KK (JP)
International Classes:
B27B17/00; B23D57/02; B23D63/16
Foreign References:
| JPS6120301U | 1986-02-05 | |||
| JPH05237836A | 1993-09-17 | |||
| JP2011527647A | 2011-11-04 | |||
| JP2008006525A | 2008-01-17 |
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