Abstract: A pneumatically actuated doctoring device for paper machine de-watering/paper forming is provided having a base member supported on a papermaking machine structure, and a blade support with a fabric contact element. A single pneumatic air tube having first and second attachments on opposing sides is also provided. The first attachment engages the base member and the second attachment engages the blade support. The tube is configured for connection to a pressurized air source and a vacuum source to extend or retract the blade support. A linkage arrangement is connected between the blade support and the base member and includes first and second links located between the base member and the support member. The links each have a pivotal connection to the base member and provide for a fixed orientation of the blade support relative to the base member as the pneumatic air tube extends or retracts the blade support.

Abstract: A pneumatically actuated doctoring device for paper machine de-watering/paper forming is provided having a base member supported on a papermaking machine structure, and a blade support with a fabric contact element. A single pneumatic air tube having first and second attachments on opposing sides is also provided. The first attachment engages the base member and the second attachment engages the blade support. The tube is configured for connection to a pressurized air source and a vacuum source to extend or retract the blade support. A linkage arrangement is connected between the blade support and the base member and includes first and second links located between the base member and the support member. The links each have a pivotal connection to the base member and provide for a fixed orientation of the blade support relative to the base member as the pneumatic air tube extends or retracts the blade support.