Fold bar drive has cylinder-piston pneumatic drive, with lines connected to cylinder below and above piston

摘要

The fold bar drive has a cylinder-piston pneumatic drive. There is a first line (72) connected to the cylinder (16) below the piston (26), connected selectively via a switching valve (54) to a vacuum creator or pressure creator. A second line (74) is connected to the cylinder above the piston, and is similarly connected via a second switching valve (52).