Patent ID: 8191733
Filing Date: 2012-06-05
Classification: B44D,G01F

Abstract:
1. An arrangement for dispensing colour paste, the arrangement comprising a piston pump comprising a cylinder; a piston arranged in said cylinder reciprocally movingly; and a piston rod to connect said piston to a power unit, the piston pump further comprising a first back-pressure valve fitted at a first end of the cylinder and arranged to let colour paste into the cylinder; a feed channel fitted to open to a second end of the cylinder; and a second back-pressure valve fitted in the piston and arranged to let colour paste from a cylinder space between the piston and the first end of the cylinder into a cylinder space between the piston and the second end of the cylinder, the cross-sectional area of the piston rod being fitted such that the feed channel is provided with a substantially different amount of colour paste per travelling length unit when the piston is moving towards the first end of the cylinder than when the piston is moving towards the second end of the cylinder; and that the arrangement further comprises a valve connected to the feed channel, the feed channel being configured to convey colour paste to said valve; a dispensing channel connected to a first outlet channel of the valve for conveying colour paste into a can for the paint to be shaded; a by-pass feed channel connected to a second outlet channel of the valve for conveying colour paste past the can for the paint to be shaded.