Tobacco – Cigar or cigarette making – Molding or forming
Patent
1989-03-17
1990-05-01
Millin, V.
Tobacco
Cigar or cigarette making
Molding or forming
131905, 131906, A21C 514, A21C 518
Patent
active
049209876
ABSTRACT:
The invention relates to a tobacco content control device for use in a cigarette manufacturing machine, wherein shredded tobacco is fed by means of a hole-provided cigarette conveyor, is trimmed by a trimming means for regulating the amount of the shredded tobacco, and is then wrapped by a wrapping means, thereby producing stick-like cigarettes. The control device comprises a fist radiometric density detector for detecting the density of the shredded tobacco before the tobacco content is trimmed, a second radiometric density detector for detecting the density of the stick-like cigarettes, a feed forward control circuit, and a feed back control circuit. The feed forward control circuit includes a high pass filter for picking up only high-frequency components out of a first signal supplied from the first radiometric density detector, and a delay circuit for delaying the high-frequency components by a predetermined time. By use of these structural elements, the feed forward control circuit generates a feed forward control signal corresponding to an instantaneous variation in the first signal. The feed back control circuit includes an integrator for integrating a second signal supplied from the second radiometric density detector. By use of this structural element, the feed back control circuit generates a feed back control signal corresponding to an average variation in the second signal. The feed forward control signal and the feed back control signal are added together, on the basis of which the trimming means is controlled.
REFERENCES:
patent: 4595027 (1986-06-01), Higgins et al.
patent: 4785830 (1988-11-01), Moller et al.
Japan Tobacco Inc.
Millin V.
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