Cheekstrip apparatus for use with cutting cylinder knives

• US 4,862,778 A
• Filed: 08/31/1988
• Issued: 09/05/1989
• Est. Priority Date: 04/06/1988
• Status: Expired due to Term

• Current Assignee: Richard W. Dixon
• Original Assignee: Richard W. Dixon
• Inventors: Dixon, Richard W.
• Primary Examiner(s): Crowder, Clifford D.
• Application Number:
  US07/238,609
• Time in Patent Office: 370 Days
• Field of Search: 83/116, 83/117, 83/138, 83/139, 83/142, 83/143, 83/346, 101/117, 101/224, 101/226, 101/DIG. 19
• US Class Current: 83/117
• CPC Class Codes: B26D 1/626 for thin material, e.g. for sheets, strips or the like
• CPC Class Codes: B26D 7/1818 by pushing out
• CPC Class Codes: B26D 7/2614 Means for mounting the cutting member
• CPC Class Codes: Y10T 83/2109 Resiliently mounted
• CPC Class Codes: Y10T 83/2157 Elastomeric stripper contacting product
• CPC Class Codes: Y10T 83/2163 Stripper biased against product
• CPC Class Codes: Y10T 83/4838 With anvil backup

Abstract

A cheekstrip having an upper part and lower part fits into a knife box assembly that is intalled in the rotary cutting cylinder of the folder used on a roll fed printing press. The upper part is made from a hard material and is connected to the lower part, which is made from a soft material such as open-cell sponge rubber. A knife is inserted between flat surfaces of two cheekstrips. The soft material applies correct pressure to the upper part, which contacts the paper against an adjacent member and clamps it securely, to enable the knife to make a quiet, consistent, distortion-free severance.

Claims

1. In a roll-fed printing press knife box assembly that includes a hollow, elongated knife box with an opening at one side thereof through which a knife of the assembly projects, a cheekstrip comprising two elongated strip pieces that are contiguous along their length, one of said pieces being composed of a relatively hard material and the other of said pieces being composed of a relatively soft, resilient material, said one piece having a flat face adapted to be juxtaposed with an opposed face of said knife, with the height of said face of said one piece in a direction extending away from said other piece being coextensive with a substantial portion of the corresponding height of said opposed face of said knife in the interior of said knife box, said one piece including a base portion adjacent to said other piece and a protrusion remote from said other piece, said base portion in combination with said other piece being shaped to occupy substantially the entire interior of the knife box at one side of the knife and said protrusion being shaped to project from said base portion through the opening of the knife box at said one side of the knife.

2. A cheekstrip in accordance with claim 1, wherein said pieces are bonded to each other throughout their length.

3. A cheekstrip in accordance with claim 1, wherein said one piece is molded onto said other piece.

4. A cheekstrip in accordance with claim 1, wherein said one piece is formed of polyurethane material and said other piece is formed of sponge rubber material.

5. In a roll-fed printing press, a knife box assembly comprising a hollow, elongated knife box with an opening at one side thereof through which a knife of the assembly projects, and a pair of elongated cheekstrips extending longitudinally within the knife box at opposite sides of the knife, each cheekstrip comprising two elongated strip pieces that are contiguous along their length, one of said pieces being composed of a relatively hard material and the other of said pieces being composed of a relatively soft, resilient material, said one piece having a flat face juxtaposed with an opposed face of said knife, with the height of said face of said one piece in a direction extending away from said other piece being coextensive with a substantial portion of the corresponding height of said opposed face of said knife in the interior of said knife box, each cheekstrip occupying substantially the entire interior of the knife box at one side of the knife, with said one piece positioned to project through the opening of the knife box and with said other piece remote from said opening.

6. A knife box assembly in accordance with claim 5, wherein said relatively hard material is a plastic resin and said relatively soft, resilient material is a spongy material.

7. A knife box assembly in accordance with claim 6, wherein said plastic resin is polyurethane and said spongy material is sponge rubber.

8. A knife box assembly in accordance with claim 5, wherein said two pieces of each cheekstrip are bonded to each other throughout their length.

9. A knife box assembly in accordance with claim 8, wherein said one piece of each cheekstrip is molded onto said other piece of that cheekstrip.

10. A knife box assembly in accordance with claim 5, wherein the interior of the knife box at each side of the knife has a rectangular transverse cross section that is occupied by a corresponding cheekstrip.

11. In a roll-fed printing press knife box assembly that includes a hollow, elongated knife box with an opening at one side thereof through which a knife of the assembly projects, a cheekstrip comprising two elongated strip pieces that are connected to each other along their length, one of said pieces being composed of a relatively hard plastic resin material and the other of said pieces being composed of a relatively soft, resilient, spongy material, said one piece having a flat face adapted to be juxtaposed with an opposed face of said knife, with the height of said face of said one piece in a direction extending away from said other piece being coextensive with a substantial portion of the corresponding height of said opposed face of said knife in the interior of said knife box, said one piece including a base portion adjacent to said other piece and a protrusion remote from said other piece, said interior of said knife box having a rectangular transverse cross section and said base portion of said one piece in combination with said other piece being shaped to occupy substantially the entire interior of the knife box at one side of the 23 knife, said protrusion being shaped to project from said base portion through the opening of the knife box at said one side of the knife.

12. In a roll-fed printing press, a knife box assembly comprising a hollow, elongated knife box with an opening at one side thereof through which a knife of the assembly projects, and a pair of elongated cheekstrips extending longitudinally within the knife box at opposite sides of the knife, each cheekstrip comprising two elongated strip pieces that are connected to each other along their length, one of said pieces being composed of a relatively hard plastic resin material and the other of said pieces being composed of a relatively soft, resilient, spongy material, said one piece having a flat face juxtaposed with an opposed face of said knife, with the height of said face of said one piece in a direction extending away from said other piece being coextensive with a substantial portion of the corresponding height of said opposed face of said knife in the interior of said knife box, the interior of said knife box at each side of said knife having a rectangular transverse cross section, and each cheekstrip occupying substantially the entire interior of the knife box at a corresponding side of the knife with said one piece positioned to project through the opening of the knife box and with said other piece remote from said opening.