| 摘要 |
The module comprises moveable stop means (2) adapted to be coupled to a support bar (1) o a chain saw by guide means (3) and disposed to make contact on an exterior surface of a tree bark (A), actuation means (4) adapted to move said stop means (2) in relation to a distal end of the bar (1), a powered electric or electronic circuit (17) and connection means (22, 23) to connect a first point of said electric or electronic circuit (17) to an electro-conductive needle (5) insertable into the tree trunk to the mother bark (B) and a second point to the bar (1). In response to variations in the electrical conductivity between the needle (5) and the bar (1), an activation and control signal is generated for said actuation means to move the stop means (2) in order to regulate the penetration depth of said bar (1). |
