Apparatus for grinding cutting edges of knives in tobacco cutting machines

• US 4,718,198 A
• Filed: 01/23/1985
• Issued: 01/12/1988
• Est. Priority Date: 02/02/1984
• Status: Expired due to Fees

• Current Assignee: Korber AG (Körber-Stiftung)
• Original Assignee: Hauni-Werke Korber & Co. KG
• Inventors: Hausler, Nikolaus, Komossa, Werner
• Primary Examiner(s): Schmidt, Frederick R.
• Assistant Examiner(s): Vaught, Bradley I.
• Application Number:
  US06/693,752
• Time in Patent Office: 1,084 Days
• Field of Search: 51/33 R, 51/33 W, 51/33 HK, 51/246, 51/247, 51/249, 51/34 R, 51/31, 51/32, 51/50 R, 83/174
• US Class Current: 451/123
• CPC Class Codes: A24B 7/04 by machines with revolving knives
• CPC Class Codes: B24B 3/46 of disc blades

Abstract

The straight of undulate cutting edges of elongated knives on the rotary knife holder in a tobacco shredding machine are ground by a driven grinding wheel, whose axis makes a small acute angle with the axis of the holder, while the grinding wheel is rocked back and forth about an axis which is parallel to the axis of the grinding wheel and is located in a second plane parallel to a first plane which is tangential to the cylindrical path of the cutting edges. If the axial length of the grinding wheel is less than the length of the cutting edges, the grinding wheel is advanced stepwise in the axial direction of the holder.

Claims

1. In a machine for cutting fibrous material, particularly tobacco, the combination of a holder rotatable about a predetermined first axis;

at least one knife mounted on said holder and having an elongated cutting edge arranged to move along an endless cylindrical first path in response to rotation of said holder; and

apparatus for sharpening the cutting edge of said knife, comprising a grinding wheel having a working surface and being rotatable about a second axis making with said first axis an acute angle, said second axis being located in a plane which is parallel to a plane extending tangentially of said endless cylindrical first path and said second axis being inclined with reference to a plane including said first axis; and

means for repeatedly moving said grinding wheel along a second path extening substantially tangentially of said endless cylindrical first path so that said working surface grinds the cutting edge of the knife during each pass of said grinding wheel along said second path.

2. The combination of claim 1, wherein said grinding wheel has an at least substantially cylindrical working surface.

3. The combination of claim 1, wherein said moving means includes means for rocking said grinding wheel about a third axis which is parallel to said second axis and is located in a plane which is parallel to a plane extending tangentially of said endless first path.

4. The combination of claim 1, wherein the axial length of said grinding wheel is less than the axial length of said holder, and further comprising means for advancing the grinding wheel stepwise substantially axially of said holder.

5. The combination of claim 4, wherein said moving means comprises means for rocking said grinding wheel about a third axis which is parallel to said second axis.

6. The combination of claim 1, wherein the axial length of said grinding wheel at least approximates the length of said holder.

7. The combination of claim 1, wherein said cutting edge and said working surface have undulate profiles.

8. The combination of claim 1, wherein said first and second axes make a small acute angle of less than 15 degrees.

9. The combination of claim 1, comprising a plurality of at least substantially equidistant knives on said holder