Rod monitoring device

Details Rod monitoring device Rod monitoring device

1989-06-23

1990-09-04

Millin, V.

Tobacco

Cigar or cigarette making

131904, 131908, 7386118, 209537, A24C 532

Patent

active

049535730

ABSTRACT:
A sensor for detecting open longitudinal seams in the continuous wrapper of cigarette or cigarette filter rod produced by a continuous rod-making machine relies on detection by a microphone (54) of disturbance caused by the defective seam to an air stream. The air stream is generated from a narrow slot (44) and normally follows a fixed, preferably flat, surface (40) closely adjacent to the longitudinal path of a rod (12). The surface (40) is part of a body (22) which contains the microphone (54) and connecting leads (56, 58), together with a passage (36) allowing sound to reach the microphone. Air is bled through a small bore (52) and through a further bore (30) containing a sound-insulating filter (66) to provide a purging air flow in the passage (36).

REFERENCES:
patent: 4685475 (1987-08-01), Ridler et al.

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