Method and machine for making a filter rod
AssigneeHauni-Werke Korber & Co. KG
InventorsHeinz Greve, Gerhard Tolasch, Uwe Heitmann, Gunter Wahle
Life of this patent
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Abstract
The mass of successive increments of a wrapped rod-like filler of filamentary filter material is monitored by a beta ray detector and the signals which are generated by the ionization chamber of the dectector are utilized to adjust the ratio of a variable-speed transmission which regulates the rate of delivery of a stretched tow of filamentary material to the gathering horn of a filter rod making machine.
Claims14
A method of making a wrapped homogeneous rod-like filler, comprising the steps of conveying an elongated tow of crimped filamentary filter material lengthwise along an elongated path;
- stretching the tow in a first portion of said path;
- converting the stretched tow into a rod-like filler in a second portion of said path;
- draping the filler into a web of wrapping material in a third portion of said path;
- measuring the mass of successive increments of the wrapped filler and generating signals each having a characteristic denoting the measured mass of such increments;
- and utilizing said signals to change the rate of transport of the tow to said second portion of said path, while maintaining the stretching action at an at least substantially constant value, when said characteristic of said signals deviates from a predetermined value.
A machine for making a homogeneous wrapped rod-like filler, comprising a source of a tow of crimped filamentary filter material;
- means for transporting the tow from said source along an elongated path, including means for stretching the tow in a first portion of said path;
- gathering means for converting the stretched tow into a rod-like filler in a second portion of said path;
- a source of web-like wrapping material;
- means for drawing the wrapping material from the respective source;
- means for draping the withdrawn wrapping material around the rod-like filler in a third portion of said path;
- and means for measuring the mass of successive increments of the wrapped filler in a fourth portion of said path, including means for generating signals each having a characteristic denoting the mass of the respective increment, said transporting means including means for varying the rate of transport of the tow to said gathering means as a function of deviation of the characteristics of said signals from a predetermined value which maintaining the action of said stretching means upon the tow in said first portion of said path at an at least substantially constant value.
Dependencies are inferred from the claim text.