NUT A.4B5172 2F0039 - Caterpillar

Illustration 1 g00854943
HH500 Harvester Head (1) Upper knife. (2) Left delimbing knife. (3) Right delimbing knife. (4) Holding arm.The delimbing system consists of movable upper knife (1), left delimbing knife (2), right delimbing knife (3) and holding arm (4). The holding arm is mounted above the saw. The delimbing knives grip the tree. Hydraulic cylinders control the operation of left delimbing knife (2), right delimbing knife (3) and holding arm (4) .The spring loaded, articulated upper knife (1) controls the position of left delimbing knife (2) and right delimbing knife (3) with a sensor when a tree is processed. This patented positioning of the two knives drastically reduces the friction losses in the harvester head. This increases the active pulling force.The knives are cast in high tensile steel in order to obtain a sharp cutting edge and high durability. Keep the knives sharp for the best delimbing results.Positioning
The movable upper knife is fastened to an articulated spring loaded arm. The upper knife activates a sensor. While the tree is being delimbed, press a preset button in the cab in order to activate the positioning function of the harvester head with the Logmate 400D controller. The positioning function is always active with the CABSWin controller. When a start button is pressed inside the cab, the feed rollers are activated in order to delimb the tree.As the trunk of the tree gets thinner, upper knife (1) moves below the preset limit of the sensor. The left knife and the right knife receive a close signal. This will lift the tree toward the movable upper knife. The upper knife is again lifted past the limit, and the knives stop closing. The delimbing of the tree continues. The grip around the trunk of the tree is kept.When the reverse feed is activated, the knives automatically get a pulse to open.