Method and arrangement for adjusting feed rate of a crosscut saw

An arrangement for adjusting a feed rate of a crosscut saw (1) during cutting,

• the crosscut saw comprising a guide bar (4) that cuts wood at a feed rate (vfeed) produced by at least one actuator (2) controlling movement of the guide bar, and the crosscut saw further comprising a cutter chain (5) revolving around the guide bar at a rotating rate (vchain),
• the crosscut saw (1) furthermore comprising means for measuring the feed rate (vfeed) of the guide bar, rotating rate (vchain) of the cutter chain and feed force (F) of the guide bar, and the measurement data is arranged to be transferred to a control unit (8) by utilizing data transmission means,
• the control unit being arranged to conclude adjustment measures from the difference of consecutive feed rate measurement data such that
• the control unit is arranged to adjust the feed force (F) of the actuator (2) for variably controlling the speed of the crosscut saw and/or the rotating rate (vchain) of the cutter chain (5) revolving around the guide bar (4) on the basis of the received and concluded data.

A method of adjusting a feed rate of a crosscut saw during crosscutting of wood, comprising the steps of:

• a) measuring a feed rate (vfeed) of the crosscut saw (1);
• b) after said measuring step a), adjusting one of i) a turning movement speed of a guide bar of the crosscut saw to adjust a feed force (F) and ii) a rotating rate (vchain) of a cutter chain (5) around a guide bar of the crosscut saw to adjust a rotating speed of the cutter chain;
• c) after said adjusting step b), determining a change (δv) in the feed rate resulting from said adjusting step;
• and
• d) repeatedly repeating steps a)–c) during the crosscutting of wood, wherein,
• each adjustment made in said adjusting step b) is based on a last determined change in the feed rate during a last determining step c), said each adjustment directed to achieve a highest possible feed rate by iteratively adjusting at least one of i) the turning movement speed of the saw blade and ii) the rotating speed of the cutter chain.