Apparatus and process for threshing tobacco

• US 6,481,441 B1
• Filed: 09/14/1999
• Issued: 11/19/2002
• Est. Priority Date: 12/17/1996
• Status: Expired due to Fees

• Current Assignee: Imperial Tobacco Limited (Imperial Tobacco Group PLC)
• Original Assignee: Imperial Tobacco Limited (Imperial Tobacco Group PLC)
• Inventors: Cunningham, William
• Primary Examiner(s): Griffin, Steven P.
• Assistant Examiner(s): MAYES, DIONNE WALLS
• Application Number:
  US09/319,986
• Time in Patent Office: 1,162 Days
• Field of Search: 131/311, 131/312, 131/313, 131/319, 131/314, 241/154, 241/159, 241/189.1, 241/227, 241/190, 241/191, 241/186.2, 241/195
• US Class Current: 131/319
• CPC Class Codes: A24B 5/06 by stripping leaf-parts from the stem
• CPC Class Codes: A24B 5/10 by crushing the leaves with subsequent separating

Abstract

An apparatus for threshing tobacco includes a rotatable stripper and a feeder which includes a pair of cooperating counter-rotatable elements for delivering tobacco leaves to the stripper. The feeder and the stripper are arranged such that, in use, the tobacco leaves experience shearing forces as they pass from between the counter-rotating elements to the rotating stripper. These forces at least partially strip the lamina from the stems.

Claims

1. Apparatus for threshing tobacco comprising rotatable stripping means and a feeder comprising a pair of co-operating counter-rotatable elements for-delivering tobacco leaves to the stripping means, the feeder and the stripping means being arranged such that, in use, the tobacco leaves experience shearing forces as they pass from between the counter-rotating elements to the rotating stripping means which forces at least partially strip the lamina from the stem.

2. Apparatus as claimed in claim 1, wherein the stripping means comprises radially extending arms.

3. Apparatus as claimed in claim 1, wherein the elements comprise radially extending arms.

4. Apparatus as claimed in claim 1, wherein the stripping means and the feeder are arranged within a rotatable drum.

5. Apparatus as claimed in claim 4, wherein the drum comprises a screen which allows at least a part of the stripped lamina to pass out of the drum.

6. Apparatus as claimed in claim 4, wherein the drum comprises internally protruding lugs for directing the tobacco leaves to the feeder.

7. Apparatus as claimed in claim 4, wherein the stripping means and the elements rotate about axes which are parallel to the axis of rotation of the drum.

8. Apparatus as claimed in claim 7, wherein the axes of rotation are substantially horizontal.

9. Apparatus as claimed in claim 1, which comprises two rotatable stripping means.

10. Apparatus as claimed in claim 1, which further comprises means for reducing the velocity of the tobacco leaves after they exit from the stripping means.

11. Apparatus as claimed in claim 10, wherein said means for reducing the velocity of the tobacco leaves is either fixed or rotates and has its axis aligned substantially parallel to the axis of rotation of the stripping means.

12. Apparatus as claimed in claim 2, wherein the arms are in the form of plates or teeth.

13. Apparatus as claimed in claim 12, wherein the arms of the stripping means and the arms of at least one of the elements are intermeshed.

14. Apparatus as claimed in claim 2, wherein the arms are flexible.