Resilient Finger Scrap Stripper for Corrugated Board Rotary Cutting Die

• US 20140041493A1
• Filed: 08/08/2012
• Published: 02/13/2014
• Est. Priority Date: 08/08/2012
• Status: Active Grant

• Current Assignee: Container Graphics Corporation
• Original Assignee: Container Graphics Corporation
• Inventors: Dulaney, Ronald Carl
• Granted Patent: US 9,067,335 B2
• Time in Patent Office: Days
• US Class Current: 83/13
• CPC Class Codes: B26D 2007/1809 by stripping fingers
• CPC Class Codes: B26D 7/1818 by pushing out
• CPC Class Codes: B26F 1/384 using rotating drums
• CPC Class Codes: Y10T 83/04 Processes
• CPC Class Codes: Y10T 83/2109 Resiliently mounted
• CPC Class Codes: Y10T 83/2133 By resiliently biased ejector
• CPC Class Codes: Y10T 83/9312 Rotatable type

Abstract

An apparatus configured to cooperate with a rotating anvil to cut corrugated board comprises a rotary cutting die configured to rotate in one direction and to cooperate with the anvil to cut corrugated board. The cutting die includes a base and at least one scrap cutting blade and a scrap stripper that comprises one or more fingers that project from the base at an incline and which is slanted forwardly in the direction of rotation of the cutting die for stripping cut scrap pieces of corrugated board from the blade.

Claims

1. An apparatus configured to cooperate with a rotating anvil to cut corrugated board, comprising:

a rotary cutting die configured to rotate in one direction and to cooperate with the anvil to cut corrugated board;

the rotary cutting die including a cylinder and a curved base and at least one scrap cutting blade secured to the base of the cutting die for cutting a piece of scrap from a sheet of corrugated board that is directed through a nip defined between the cutting die and the anvil;

a scrap stripper mounted to the base adjacent the blade for stripping a cut scrap piece of corrugated board from the blade and for urging the cut scrap piece of corrugated board against the anvil as the cut scrap piece of corrugated board exits the nip;

the scrap stripper including one or more fingers that project from a base at an incline and is slanted forwardly in the direction of rotation of the rotary cutting die; and

the finger constructed of resilient and compressible material and moveable from an engaged position where the finger projects in the direction of rotation of the rotary cutting die and an engaged position where the finger engages the cut piece of scrap and is bent back and compressed.

2. The apparatus of claim 1 wherein the finger is inclined at a forward acute angle of approximately 10 to approximately 40 degrees where the forward acute angle is defined by a finger angled line and a normal reference line.

3. The apparatus of claim 1 wherein the scrap stripper is elongated and includes the base and a plurality of fingers projecting from the base and wherein the fingers are generally parallel and inclined in the direction of rotation of the rotary cutting die.

4. The apparatus of claim 2 wherein the scrap striper includes a base and only one finger extending from the base.

9. The apparatus of claim 1 wherein the finger extends at a finger angle of approximately 15 to approximately 30 degrees relative to a normal reference line.

5. A method of cutting corrugated board passing between a rotary cutting die and an anvil where the rotary cutting die is rotated in one direction, comprising:

directing a sheet of corrugated board through a nip area defined between the rotary cutting die and anvil;

cutting at least one scrap piece from the corrugated board as it passes through the nip;

forwardly angling a scrap stripper finger from the rotary cutting die in the direction of rotation of the rotary cutting die such that in a disengaged position the finger is slanted forwardly relative to the rotation of the rotary cutting die;

engaging the forwardly angled scrap stripper finger with the cut scrap piece and causing the forwardly angled scrap stripper finger to bend back and project in a direction away from the direction of rotation of the rotary cutting die resulting in the finger being compressed in the nip while engaging the cut scrap piece;

as the rotary cutting die and anvil rotate and the cut scrap emerges from the nip, releasing the bent back finger allowing the finger to spring forwardly to its forwardly angled position and in the process stripping the cut scrap from the scrap cutting blade and directing the cut scrap piece away from the nip and away from the rotary cutting die and anvil.

6. The method of claim 5 wherein there is provided a plurality of scrap stripping fingers projecting from a base that forms a part of the rotary cutting die and wherein the plurality of fingers are spaced apart and slanted forwardly relative to the direction of rotation of the rotary cutting die.

7. The method of claim 5 wherein the scrap stripping finger comprises only one finger that is supported by a base that forms a part of the rotary cutting die and wherein the finger is slanted forwardly but wherein when the finger engages the cut piece of scrap and passes through the nip, the finger bends back across a normal reference line and is curled in the nip such that the finger, when compressed in the nip, projects away from the direction of rotation of the rotary cutting die.

8. The method of claim 5 including passing the forwardly angled finger through the nip and engaging the cut piece of scrap and wherein as the finger enters and passes through the nip, the finger moves from its forwardly angled position past a normal reference line and is bent back such that the finger generally points in a direction opposite the direction of rotation of the rotary cutting die and wherein, after passing through the nip and engaging and urging the cut piece of scrap away from the rotary cutting die and anvil, the finger uncurls and passes forwardly past the normal reference line to the forwardly angled position.

10. An apparatus configured to cooperate with a rotating anvil to cut corrugated board, comprising:

a rotary cutting die configured to rotate in one direction and to cooperate with the anvil to cut corrugated board;

the rotary cutting die including a cylinder and a curved base and at least one scrap cutting blade secured to the base of the cutting die for cutting a piece of scrap from a sheet of corrugated board that is directed through a nip defined between the cutting die and the anvil;

a scrap stripper mounted to the base adjacent the blade for stripping a piece of cut scrap of corrugated board from the blade and for urging the cut scrap piece of corrugated board against the anvil as the cut scrap piece exits the nip;

the scrap stripper including one or more fingers that project from the base at an incline and is slanted forwardly in the direction of rotation of the rotary cutting die;

wherein the angular orientation of the finger relative to the base of the rotary cutting die is defined by a finger angle line and a normal reference line, and wherein the finger projects at an angle forwardly of the normal reference line and wherein the finger angle line and the normal reference line forms a forward angle of at least 10 degrees.

11. The apparatus of claim 10 wherein the finger extends at a finger angle of approximately 15 degrees to approximately 30 degrees relative to a normal reference line.