Importance

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Abstract

An improved filling machine with tandem-operated diaphragm filling units is disclosed. The filling machine comprises a plurality of individual filling units operated in common from a common drive bar. Each of the filling units includes a cylinder, a flexible rolling diaphragm secured within the cylinder to delimit a working chamber in the cylinder on one side of the diaphragm, a piston arranged with clearance in the cylinder on the other side of the diaphragm for reciprocation in the cylinder, the clearance between the piston and the cylinder permitting the flexible diaphragm to roll and unroll on the piston sidewall and cylinder wall during filling and discharging of a liquid from the working chamber of the filling unit, passages in the cylinder for providing fluid communication with the working chamber, a piston rod extending between the piston and the common drive bar for transmitting a driving force from the common drive bar to the piston during a discharge stroke of the filling unit, the sidewall of the piston and the cylinder wall upon which the diaphragm is rolled and unrolled being tapered in opposite directions a like degree to increase the life of the rolling diaphragm, and wherein the piston rod length is adjustable to permit a change in the distance that the piston penetrates into the cylinder with a given stroke length whereby the volume dispensed by an individual filling unit can be finely adjusted.

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First Claim