Paint toning machine

Abstract

A paint toning machine comprising a container ( 11, 12 ) for storing each paint to be fed, such as toning paste or paint, a piston pump ( 3, 4 ) arranged in flow communication with the paint in the container for feeding the paint, and driving means ( 2, 5 - 10 ), driven by a servomotor, for driving the piston pump. In the invention, the driving means comprise a device ( 10 ) for changing the rotary motion of the shaft ( 5 ) driven by the servomotor in different directions of rotation into linear motion moving the piston rod ( 7 ) of the piston pump in opposite directions, and a coupling ( 8, 9 ) for selectively coupling the piston rod ( 7 ) of the piston pump and the shaft ( 5 ) driven by the servomotor ( 2 ) into engagement via said changing device ( 10 ).

1 . A paint toning machine comprising a container ( 11 ,  12 ) for storing each paint to be fed, such as toning paste or paint, a piston pump ( 3 ,  4 ) arranged in a flow connection with the paint in the container for feeding the paint, and driving means ( 2 ,  5 - 10 ), driven by a servomotor, for driving the piston pump, the driving means comprising a device ( 10 ) for changing the rotary motion of the shaft ( 5 ) driven by the servomotor in different directions of rotation into linear motion moving the piston rod ( 7 ) of the piston pump in opposite directions, characterized in that the machine further comprises a coupling ( 8 ,  9 ) for selectively coupling the piston rod ( 7 ) of the piston pump and the shaft ( 5 ) driven by the servomotor ( 2 ) into engagement via said changing device ( 10 ).  
     
     
         2 . A paint toning machine according to  claim 1 , characterized in that the device for changing the rotary motion of the shaft ( 5 ) driven by the servomotor into reciprocating motion of the piston rod ( 7 ) comprises a gearwheel ( 10 ) provided on the shaft, and toothing, provided in the piston rod ( 7 ) of the piston pump, which can be arranged to engage the teeth of the gearwheel.  
     
     
         3 . A paint toning machine according to  claim 1 , characterized in that the device for changing the rotary motion of the shaft driven by the servomotor into reciprocating motion of the piston rod comprises a spring band or some other corresponding flexible element, which is incompressible in its longitudinal direction, which is coupled to the piston rod and arranged to be wound around or unwound from a ring provided around the shaft driven by the servomotor and arranged to be rotated together with the shaft by means of said coupling, depending on the direction of rotation of the shaft driven by the servomotor.  
     
     
         4 . A paint toning machine according to any one of  claims 1  to  3 , characterized in that the device ( 10 ) for changing the rotary motion of the shaft ( 5 ) driven by the servomotor in different directions of rotation into linear motion moving the piston rod ( 7 ) of the piston pump in opposite directions is shared by two piston pumps which form a pair, such that when one piston pump ( 3 ) of the pair sucks fluid into itself, the other pump ( 4 ) forces it out.  
     
     
         5 . A paint toning machine according to  claim 4 , characterized in that the piston pumps ( 3 ,  4 ) of the pair are arranged opposite one another, such that the piston rods thereof are combined into a single rod ( 7 ).  
     
     
         6 . A paint toning machine according to any one of  claims 1  to  5 , characterized in that it also comprises a reduction gear ( 19 ) arranged between the servomotor ( 2 ) and the driving shaft ( 5 ) for the piston pumps.  
     
     
         7 . A paint toning machine according to any one of  claims 1  to  6 , characterized in that one and the same servomotor ( 2 ) is arranged to drive at least two piston pumps ( 3 ,  4 ).  
     
     
         8 . A paint toning machine according to  claim 4  or  5 , characterized in that one and the same servomotor ( 2 ) is arranged to drive at least two pairs of piston pumps ( 3 ,  4 ).