Method and device for feeding strip paper on a dual-rod cigarette manufacturing machine
AssigneeG.D Societa' Per Azioni
InventorsRiccardo Mattei, Bruno Belvederi
Life of this patent
Estimating the term…
Abstract
Method and device for feeding strip paper on a dual-rod cigarette manufacturing machine, whereby two identical strips are first stabilized as to tension by respective adjustable brake means, and then fed by a common feed device onto respective conveyors extending along respective fixtures for forming respective cigarette rods; a first of the conveyors being set in such a manner as to feed the respective strip at a given theoretical speed, the common feed device being controlled in such a manner as to supply the amount of strip actually required by the first conveyor, and the other conveyor being controlled in such a manner as to supply the full amount of strip received from the common feed device.
Claims8
Method of feeding strip paper on a dual-rod cigarette manufacturing machine (1), the said rods (6, 7) being formed by feeding, via respective conveying means (35, 36), a first and a second paper strip (21, 22) along a respective forming fixture (8) designed to fold each said strip (21, 22) crosswise about a respective layer of tobacco, the said strips (21, 22) being produced by cutting longitudinally in half a strip of paper (10) twice as wide as the said strips (21, 22);
- characterised by the fact that it comprises stages consisting in:
- regulating a first (35) of the said conveyor means (35, 36) in such a manner as to feed the respective said first strip (21) at a given theoretical speed;
- feeding the said strips (21, 22) to the respective conveying means (35, 36) by means of a feed device (24) common to both strips (21, 22);
- controlling, via respective adjustable brake means (43), the tension of each of the said two strips (21, 22) extending between the said common feed device (24) and the respective said conveying means (35, 36), in such a manner as to maintain the tension of both said strips (21, 22) constantly equal to a given tension value;
- controlling the said common feed device (24) in such a manner as to feed both the said strips (21, 22) at the same speed at which the said first strip (21) is actually fed by the said first conveying means (35);
- controlling a second (36) of the said conveying means (35, 36) in such a manner as to feed the respective said second strip (22) at the same speed at which the said second strip (22) is fed by the said common feed device (24).
Device for feeding strip paper on a dual-rod cigarette manufacturing machine (1), the said device comprising two fixtures (8) for simultaneously forming two continuous cigarette rods (6, 7), a common feed device (24) for supplying an identical first and second paper strip (21, 22) to the said fixtures (8) for respectively forming a said first and a said second continuous cigarette rod (6, 7), and first and second conveying means (35, 36) extending along the said forming fixtures (8) and designed to feed the said first and the said second rod (6, 7) respectively along the same;
- characterised by the fact that is also comprises first and second tension stabilizing means (31) and first and second compensating emans (30) cooperating respectively with the said first and the said second strip (21, 22);
- each said stabilizing means (31) comprising means (47, 48) for detecting the tension of the respective said strip (21, 22), and braking means (43) engaged in sliding manner by the said strip (21, 22) and the variable power of which is controlled by the respective said detecting means (47, 48) in such a manner as to maintain the said tension constantly equal to a given set tension;
- the said compensating means (30) comprising first and second counterweight means (60), supported respectively on the said first and second strips (21, 22), and first and second means (63) for respectively detecting the position of the said first and second counterweight means (60);
- the said first position detecting means (63) controlling the said common feed device (24) in such a manner as to maintain the said first counterweight means (60) in a given position, and the said second position detecting means (63) controlling the said second conveying means (36) in such a manner as to maintain the said second counterweight means (60) in a given position.
Dependencies are inferred from the claim text.