Cigarette Making Machine

What is this patent about?

'899 is related to the field of cigarette manufacturing, specifically addressing the challenge of maintaining consistent cigarette weight in automated production. Existing automatic control systems using beta ray gauges suffered from significant transportation lag, where the time delay between measuring tobacco density and adjusting the feed mechanism resulted in slow response and inaccurate weight control. This lag was due to the distance between the measuring apparatus and the control apparatus, as well as the inertia of the hopper mechanisms.

The underlying idea behind '899 is to improve the responsiveness of cigarette weight control by minimizing transportation lag and inertia. This is achieved through a combination of innovations: a scintillation detector placed close to the tobacco feed, a reference detector to compensate for variations, and auxiliary tobacco feeds with low inertia. The scintillation detector allows for measuring shorter lengths of tobacco, enabling faster detection of weight variations. The auxiliary feeds, controlled independently, provide rapid adjustments to the tobacco flow.

The claims of '899 focus on a cigarette-making machine that incorporates a radiation detector and control mechanism for regulating tobacco feed. This includes a radiation source embedded within a roller, a measuring detector positioned above the roller, and a compensating detector positioned below. The machine also features one or more auxiliary tobacco sources with low inertia, located close to the detector, to enable rapid adjustments to the tobacco flow based on density measurements.

In practice, the beta rays emitted from the source pass through the tobacco stream, and the detectors measure the radiation intensity to determine tobacco density. The signals from the detectors are then used to control the main hopper speed, as well as the auxiliary tobacco feeds. By placing the radiation source within the roller and using scintillation detectors, the invention minimizes the distance between the measurement point and the control mechanisms, thereby reducing transportation lag. The auxiliary feeds, with their low inertia, allow for quick corrections to the tobacco flow, further improving the responsiveness of the system.

The key differentiation from prior approaches lies in the combination of a compact radiation source and detector arrangement with auxiliary tobacco feeds. Earlier systems relied on beta ray gauges placed further from the feed mechanism, resulting in significant transportation lag. While some improvements were made by removing a pressure roll to place the gauge closer, this introduced new problems. '899 overcomes these limitations by integrating the radiation source into a roller, using scintillation detectors for faster response, and incorporating low-inertia auxiliary feeds for rapid and precise weight control.