EP 0339250 B1 19930804 - A DEVICE FOR CONTROLLING THE CONTENT OF TOBACCO ON A CIGARETTE MANUFACTURING MACHINE
Title (en)
A DEVICE FOR CONTROLLING THE CONTENT OF TOBACCO ON A CIGARETTE MANUFACTURING MACHINE
Publication
Application
Priority
JP 10384088 A 19880428
Abstract (en)
[origin: EP0339250A1] The invention relates to a tobacco content control device for use in a cigarette manufacturing machine, wherein shredded tobacco (T) is fed by means of a hole-provided cigarette conveyor (103), is trimmed by a trimming means (104a) for regulating the amount of the shredded tobacco (T), and is then wrapped by a wrapping means, thereby producing stick-like cigarettes (S). The control device comprises a first radiometric density detector (106) for detecting the density of the shredded tobacco (T) before the tobacco content is trimmed, a second radiometric density detector (116) for detecting the density of the stick-like cigarettes (S), a feed forward control circuit (200, 202, 205, 251, 252, 253, 254, 255), and a feed back control circuit (204, 222, 224). The feed forward control circuit (200, 202, 205, 251, 252, 253, 254, 255) includes a high pass filter for picking up only high-frequency components out of a first signal supplied from the first radiometric density detector (106), and a delay circuit (400) for delaying the high-frequency components by a predetermined time. By use of these structural elements, the feed forward control circuit (200, 202, 205, 251, 252, 253, 254, 255) generates a feed forward control signal corresponding to an instantaneous variation in the first signal. The feed back control circuit (204, 222, 224) includes an integrator for integrating a second signal supplied from the second radiometric density detector (116). By use of this structural element, the feed back control circuit (204, 222, 224) 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 (104a) is controlled.
IPC 1-7
IPC 8 full level
A24C 5/34 (2006.01)
CPC (source: EP)
A24C 5/3412 (2013.01)
Designated contracting state (EPC)
DE GB IT
DOCDB simple family (publication)
EP 0339250 A1 19891102; EP 0339250 B1 19930804; DE 68907986 D1 19930909; DE 68907986 T2 19940324; JP H01277479 A 19891107; JP H0567273 B2 19930924
DOCDB simple family (application)
EP 89104938 A 19890320; DE 68907986 T 19890320; JP 10384088 A 19880428