This type of a band saw is mainly used in saw mills for the lengthwise cutting of tree trunks or, in general, of large wood blocks. In contrast to framesaws, mostly only one board is cut, but due to the thinner saw blade there is less material wasted. In principle, a log band saw works like a resaw, i.e. like a band saw with a feed motion. The tree trunk, however, is cyclical guided through the band saw on a saw carriage, also called clamping cart. This makes an intervention of the operator unnecessary.

Construction

The lying tree trunks or wood blocks are cut with a band saw. The wood to be cut lies on the clamping cart, which is moving parallel to this saw. It is its task to feed the tree trunk or raw wood lengthwise into the saw, so that one board is cut at a time. As soon as this is done, the board falls onto a roller feeder and is transported on.

Mode of operation

The operator clamps the tree trunk to be cut onto the clamping cart using so-called clamping blocks, which hydraulically fixate the piece to be sawed with clamping hooks. The clamping cart moves towards the band saw, i.e. in cutting direction of the saw blade. The tree trunk on the clamping cart is now cyclical guided through the band saw and cut lengthwise. After this process, the clamping cart moves back to its starting position in front of the saw, so that the tree trunk can be cut again. An alternating processing is also possible using a saw blade which cuts on both sides.