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US 4,901,740 AGranted
Apparatus for threading webs in cigarette rod making machines and the like
AssigneeKorber AG
InventorUwe Heitmann
Life of this patent
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AssigneeKorber AG
InventorUwe Heitmann
Estimating the term…
The leader of a web of cigarette paper in a cigarette rod making machine is threaded through the nip or nips one or more advancing rollers, a web bronzing device and one or more imprinting mechanisms by an apparatus employing an endless toothed belt conveyor or a chain conveyor having a stretch which is adjacent to the path of movement of the web. The conveyor carries a pin, a tongs or another suitable entraining member which is connected to the leader of the web before the conveyor is set in motion to advance the web along the path. One roller of each pair of advancing rollers is automatically retracted to allow for the passage of the leader of the web as well as of the entraining member through the nip or nips. The obstructions in the imprinting mechanism(s) and in the bronzing device are treated in the same way, i.e., one component of the pair of components which define a obstruction is retracted to permit passage of the entraining member. The width of a obstruction is reduced to normal as soon as the entraining member has advanced therethrough or when the entraining member completes its movement along the path for the web. Retraction of one component of each pair of components which define a obstruction can be effected by an electromagnet or by a pneumatic motor in response to signals from a control circuit.
Apparatus for threading an elongated flexible web through a processing machine, particularly for threading a web of cigarette paper through a cigarette rod making machine, wherein the properly threaded web advances in a predetermined direction along a predetermined path and wherein a portion of said path includes of constitutes an expandible obstruction whose width normally suffices solely for advancement of the web therethrough, comprising an endless flexible conveyor having a portion extending along said path;
In a machine for processing elongated flexible webs, particularly in a cigarette rod making machine wherein a web of cigarette paper is draped around a tobacco filler, the combination of guide means defining an elongated path for advancement of a web in a predetermined direction and including at least one pair of components one of which is movable toward and away from the other of said pair of components to thereby increase the width of a portion of said path which portion normally constitutes an obstruction barely sufficient to allow for advancement of the web therethrough;
Dependencies are inferred from the claim text.