Following ground contour down to 25mm with Biso flex header


Biso’s new header line-up offers operators a fast transition between crops and a ground-following system that reduces losses, and is excellent for short crop harvesting, laid grain, and matted cereals.

3D Varioflex headers, available in two options — 3D Varioflex•Air and 3D Varioflex•Air•i — use force sensors to measure ground contact pressure, and an automatic system to actively adjust the cutter bar to the operator’s preference (from 0 to 50kg). Carriers connected at the rear of the header actively guide it over bumps, offering precise cutting of the crop, even down to a minimum height of 25mm.

“The key of this system is a parallelogram,” says Biso’s Václav Štursa. “This means the angle of the fingers is still the constant, so the load on the knife is much less than before.”

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The parallelogram-controlled flex cutter bar maintains a constant cutting angle of 10°, with air suspension for each flex arm parallelogram. In the 3D•AIR•i model, the system intelligently controls the cutter bar through air bellows and pneumatic valves, allowing it to actively follow the ground contour (compared to seeing the flex arms float and pivot through air bellows with the 3D•AIR model).

The headers use aluminum, combined with high strength steel and stainless steel to find a balance between light-weight and durable. They come in widths of 6.7 to 18.5 metres, and can be switched from rigid to flex mode from the comfort of the cab.

Biso says this system allows for continuous material flow to the threshing elements, and minimal losses on the cutting table.

RealAgriculture’s Shaun Haney caught up with Biso’s Václav Štursa at Agritechnica, in Hanover, Germany. The duo cover some of the basics on the Varioflex header, how it does with rocks, and its use across multiple crops:

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