Gas-venting arrangement

Abstract

The invention relates to a gas-venting arrangement in a paint-toning machine. A dispensing device ( 20 ) comprises an at least substantially vertical-shafted dispensing pump ( 20 ) connected through a suction pipe ( 13 ) to the inside of a colour paste container and through a dispensing pipe ( 17 ) to a dispensing nozzle. The pump ( 20 ) comprises a dispensing cylinder ( 21 ) and inside it a reciprocating displacement element ( 14 ). The lower end of the displacement element ( 14 ) in the lower extreme position of its dispensing movement is either level with or past the upper edge ( 15 ) of the dispensing pipe ( 17 ) opening into the dispensing cylinder ( 21 ), and the positions of the suction and dispensing pipes ( 13, 17 ) and the lower end of the displacement element ( 14 ) in said extreme position are such that they together form a substantially horizontal flow path or one ascending in the direction (A) of the dispensing flow.

1 . A gas-venting arrangement in a paint-toning machine which comprises one or more containers ( 11 ) for storing colour paste or the like, and a dispensing device ( 20 ) connected to each container for dispensing the colour paste from the colour paste container ( 11 ), the dispensing device comprising an at least substantially vertical-shafted dispensing pump ( 20 ) connected through a suction pipe ( 13 ) to the inside of the colour paste container and through a dispensing pipe ( 17 ) to a dispensing nozzle ( 18 ) and comprising a dispensing cylinder ( 21 ) and inside it a reciprocating replacement element ( 14 ), whereby the dispensing is controlled by a suction valve ( 12 ) arranged in the suction pipe ( 13 ) and a dispensing valve ( 16 ) arranged in the dispensing pipe ( 17 ), characterized in that the lower end of the displacement element ( 14 ) in the lower extreme position of the dispensing movement of the element with respect to earth gravity is either level with the upper edge ( 15 ) of the dispensing pipe ( 17 ) opening into the dispensing cylinder ( 21 ) or past it, and that the mutual height positions of the suction and dispensing pipes ( 13 ,  17 ) and the lower end of the displacement element ( 14 ) in said extreme position are such that they together form a substantially horizontal flow path or a flow path ascending in the direction (A) of the dispensing flow.  
     
     
         2 . An arrangement as claimed in  claim 1 , characterized in that the top edges of the suction and dispensing pipes ( 13 ,  17 ) and the lower end of the displacement element ( 14 ) in the lower extreme position of its dispensing movement are located substantially on the same line which at least slightly ascends in the direction of the dispensing pipe ( 17 ).  
     
     
         3 . An arrangement as claimed in  claim 1  or  2 , characterized in that the displacement element ( 14 ) is a plunger.  
     
     
         4 . An arrangement as claimed in  claim 1  or  2 , characterized in that the displacement element ( 14 ) is one that moves with a bellows.