Weighing apparatus for continuously weighing a passing layer of fiber material in a metering device of a spinning preparatory machine

Claim 1

A weighing apparatus for continuously weighing a throughpassing continuous layer of fiber material in a metering device of a spinning preparatory machine, comprising two pair of rolls constituting a first pair of rolls and a second pair of rolls arranged in spaced relationship from one another and defining therebetween a measuring zone, said two pairs of rolls serving for supplying the layer of fiber material to and for removing the layer of fiber material from said measuring zone disposed between said spaced pairs of rolls, said rolls transporting the layer of fiber material across said measuring zone at a predetermined speed of movement, two weighing plates located in said measuring zone, means for mounting each of said weighing plates for pivotal movement about a respective pivot axis, a measuring signal transmitter operatively connected with said two weighing plates for generating a signal which depends upon the angle of pivoting of the weighing plates, a thin highly flexible endless transporting belt arranged to contactingly glide across the weighing plates for additionally transporting the layer of fiber material from the first pair of rolls to the second pair of rolls under elimination of irregular friction forces of said layer on said weighing plates, the sides of said thin transporting belt being connected with two endless driving belts arranged beyond the reach of said weighing plates and means for driving said driving belts and for controlling the speed of said transporting belt at substantially the predetermined speed of movement at which said rolls transport the layer of fiber material across the measuring zone.