Abstract: A defect detection method on a moving sheet of pliable fibrous material. The primary detection array is used to scan the moving sheet of fibrous material in at least one primary detection area, which fibers, after falling onto the moving belt, enter after a time shorter than 15 minutes. The secondary detection array scans the sheet of fibrous material in at least one secondary detection area, which the fibers, after falling on the carrying belt, reach later than the primary detection area, whereupon the information about the identified defects is sent to the assessment system, where, on the basis of information about at least some defects identified by the primary detection array, an area of the sheet of fibrous material is determined for which an assessment of defects identified by the secondary detection array will be performed.

Abstract: This invention relates to a defect detection method on a moving sheet of pliable fibrous material created by fibres falling onto a carrying belt while the primary detection array is used to scan the moving sheet of fibrous material in at least one primary detection area (A), which the fibres, after falling onto the moving belt, enter after a time shorter than 15 minutes. Information about the identified defects is sent for assessment, where it forms the basis for assessing need to adjust production parameters.

Abstract: A variable capacity vane pump has a pump control ring that is moveable to alter the capacity of the pump. A control chamber is formed between the pump casing and the control ring. The control chamber is operable to receive pressurized fluid to create a force to move the control ring to reduce the volumetric capacity of the pump. A primary return spring acts between control ring and the casing to bias the control ring towards a position of maximum volumetric capacity. A secondary return spring is mounted in the casing and is configured to engage the control ring after the control ring has moved a predetermined amount. The secondary return spring biases the control ring towards a position of maximum volumetric capacity. The secondary return spring acts against the force of the control chamber to establish a second equilibrium pressure.

Abstract: A novel crescent gear pump and pump rotor set for a crescent gear pump. The rotor set includes an outer rotor with teeth having a composite profile formed over the portion adjacent their root to conform to a circular arc and formed over the portion adjacent their tip to conform to a hypocycloid arc. The unique shape allows for increased volumetric capacity of the rotor set, when compared to trochoidal rotor sets of the same size. Further, operating noise is reduced, as are pulsations in the output of the pump when compared to the same pump with a trochoidal rotor set.

Abstract: In a traditional variable-displacement vane pump, at lower speeds the pump will often operate at a higher capacity than necessary for that speed, thus wasting energy. A variable capacity vane pump (20) is provided having a pump control ring (44) that is moveable to alter the capacity of the pump (20). A control chamber (60) is formed between the pump casing (22) and the control ring (44). The control chamber (60) is operable to receive pressurized fluid to create a force to move the control ring (44) to reduce the volumetric capacity of the pump (20). A primary return spring (56) acts between the control ring (44) and the casing (22) to bias the control ring (44) towards a position of maximum volumetric capacity. A secondary return spring (62) is mounted in the casing (22) and is configured to engage the control ring (44) after the control ring (44) has moved a predetermined amount. The secondary return spring (62) biases the control ring (44) towards a position of maximum volumetric capacity.

Abstract: A novel crescent gear pump and pump rotor set for a crescent gear pump. The rotor set includes an outer rotor with teeth having a composite profile formed over the portion adjacent their root to conform to a circular arc and formed over the portion adjacent their tip to conform to a hypocycloid arc. The unique shape allows for increased volumetric capacity of the rotor set, when compared to trochoidal rotor sets of the same size. Further, operating noise is reduced, as are pulsations in the output of the pump when compared to the same pump with a trochoidal rotor set.