CUT-OFF DEVICE

• US 3,709,077 A
• Filed: 03/01/1971
• Issued: 01/09/1973
• Est. Priority Date: 03/01/1971
• Status: Expired due to Term

• Current Assignee: James H. Beebe, John F. Trogan
• Original Assignee: James H. Beebe, John F. Trogan
• Inventors: Trogan, John F., Beebe, James H.
• Primary Examiner(s): Yost, Frank T.
• Application Number:
  US05/119,614
• Time in Patent Office: 680 Days
• Field of Search: 83/152,345,342,674,673,672,698,699
• US Class Current: 83/152
• CPC Class Codes: B26D 1/0006 Cutting members therefor
• CPC Class Codes: B26D 1/405 for thin material, e.g. for sheets, strips or the like
• CPC Class Codes: B26D 1/626 for thin material, e.g. for sheets, strips or the like
• CPC Class Codes: B26D 2001/0053 having a special cutting edge section or blade section
• CPC Class Codes: B26D 2001/0066 having shearing means, e.g. shearing blades, abutting blades
• CPC Class Codes: B26D 7/018 Holding the work by suction
• CPC Class Codes: B26D 7/2614 Means for mounting the cutting member
• CPC Class Codes: Y10T 83/2185 Suction gripper
• CPC Class Codes: Y10T 83/4827 With helical cutter blade
• CPC Class Codes: Y10T 83/4836 With radial overlap of the cutting members
• CPC Class Codes: Y10T 83/9394 Helical tool
• CPC Class Codes: Y10T 83/9399 Cutting edge wholly parallel to axis of rotation
• CPC Class Codes: Y10T 83/9469 Adjustable

Abstract

A rotary shear or cut-off device for web fed materials such as paper napkin stock that includes a novel adjusting means, the device being capable of operating at high speeds without difficulties, and wherein all four edges of the knife, such as the anvil knife, can be used, and wherein chamfered edges are utilized on the anvil knife and fly knife.

Claims

1. In a web cut-off device for cutting paper napkin stock and the like, a vacuum roll and a fly knife roll, an anvil knife, and a fly knife mounted in said vacuum roll and fly knife roll, respectively, a holder for said fly knife, a wedge block positioned adjacent said holder, adjustable set screws operatively connected to said fly knife roll and engaging said holder and wedge block, said anvil knife having chamfered edges that run along its entire length on all four sides thereof, said fly knife having chamfered corners thereon, and holding means for the anvil knife.

2. The structure as defined in claim 1, wherein said last-named holding means comprises a block affixed to said vacuum roll, and a wedging block and clamping block for said anvil knife.

3. The structure as defined in claim 1, and further including gear means.

4. The structure as defined in claim 1, and further including gear means that comprises split gear members, hubs associated with said gear members, and securing elements and pins operatively associated with said gear means.

5. The structure as defined in claim 1, wherein the fly knife has a chamfered corner on the leading edge to help it get under the anvil knife.

6. The structure as defined in claim 1, wherein the fly knife is adapted to be chamfered on all four corners for use on all four cutting edges, and wherein the anvil knife is chamfered across the entire cutting edge on all four corners for use on all four corners.

7. The structure as defined in claim 1, and further including gear means that comprises split gear members, one of said split gear members being adjustable in a direction opposite to its rotation by loosening securing elements and adjusting said screws in order to remove all backlash between these gears.

8. The structure as defined in claim 1, wherein the holding means for the anvil knife includes a block affixed to the vacuum roll, and the wedging block thereon.

9. A new article of manufacture, a web cut-off device for cutting paper napkin stock and the like, comprising a vacuum roll and a fly knife roll, an anvil knife mounted in said vacuum roll, a fly knife mounted in said fly knife roll, a holder for said fly knife, a wedge block positioned adjacent said holder, adjustable set screws operatively connected to said fly knife roll and engaging said holder and wedge block, said knives having chamfered edges and corners, holding means for the anvil knife, said last-named holding means comprising blocks, one of which has a tapereD seat, said web cut-off device further including gear means that embodies split gear members, securing elements and pins operatively connected to said gear means, said fly knife having a chamfered corner on the leading edge to help it get under the anvil knife, the anvil knife being chamfered across the entire cutting edge on all four corners for use on all four corners.