Manual marking of wood defects, of intersections or for marking quality grades before cutting.

Technical principle

The operator visually checks the workpiece in front of him for the presence of unacceptable wood irregularities or assigns the workpiece areas to individual quality grades. The corresponding areas are marked manually with fluorescent chalk using straight lines.

After this workpiece has been transferred to the infeed conveyor system of the machine, a sensor (luminescence sensor) determines the marked areas and transfers the position points to the machine control. Depending on the set operating mode, the wood defects are merely cut out in the subsequent work step or the good workpieces are subjected to full optimisation in conjunction with length and quantity data from a parts list. Condition: Length measurement of the raw workpiece.

• During quality optimisation, in addition to defect marking, further markings are made by means of chalk marks in order to distinguish quality levels.

Chalk markings

• Draw at right angles to the workpiece edge.
• For narrow workpieces over the entire width of the workpiece.
• For wide workpieces, draw for about 10 cm in the scanning area of the luminescence scanner.
• The distance between two chalk strokes of a marking point should be approx. 15 to 20mm.

Quality markings - when using a luminescence scanner

• Up to 8 (DIMTER) chalk marks are drawn in sequence on the top of the workpiece to mark up to 8 different qualities.
• The quality marking is made (seen in feed direction) at the end of the corresponding part.
• The last stroke determines the end of the part.

Quality markings - when using two luminescence scanners

• Length markings are made on the wide upper side of the workpiece.
• Quality markings are made on the narrow side of the boards

Related terms

• Double marking station (PAUL): Workstation upstream of the machine for two people who accelerate the chalk marking and thus the material feed.