This control allows the Large Roller Bar, or «Big Bar», to perform its main function of imparting peripheral force to the block in conjunction with the core drive. The large diameter roller bar imparts torque to the block surface, which reduces spinouts and plug-ups by allowing a free pass-through of slivers. The specially designed, fluted roll can provide improved recovery and production, particularly from low-quality blocks.
New servo-controlled vertical bar height adjustment ensures maximum continuous block contact as its being peeled to very small diameters.
Adjusting the roller bar height dynamically while peeling from large diameter to core limit allows «optimal» positioning of the drive roll relative to knife tip. This better fit of knife and drive roll improves veneer quality and reduces the required torque applied by the spindles.
The design permits large lathe spindles to remain in the block longer without contacting the pressure bar drive housings. Additionally, due to the added drive housing clearance, the large spindles can be positioned closer to the block at retract providing added support for the small spindles and decreasing wood to wood time by remaining closer to the ends of the incoming block.