Cutting – Other than completely through work thickness or through work... – Combined types of cutting
Reexamination Certificate
1999-05-20
2001-11-06
Rachuba, M. (Department: 3724)
Cutting
Other than completely through work thickness or through work...
Combined types of cutting
C083S886000, C083S884000, C083S885000
Reexamination Certificate
active
06311601
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a die for cutting and scoring sheet material, such as paper or cardboard.
2. Description of Related Art
A wide range of consumer products are marketed in boxes which are produced in high volumes. These boxes are made from paperboard or cardboard which must be cut to the proper shape and then scored to form fold lines so that the box may be later assembled for use. Labels are made in a similar manner. In general, it is preferable to effect both cutting and scoring in the same procedure using the same set of dies, and it is also preferable that the cutting and scoring dies be either an integral part of, or mounted upon, high speed rollers for high speed production. Sheet material may be cut along predetermined cutting lines by rotary pressure cutting, in which two lands mounted closely adjacent one another along the desired cutting line crush the sheet material between them, thus severing the sheet material. U.S. Pat. No. 3,142,233 discloses such a rotary pressure cutting die. Also commonly used are crush cutting dies, in which a knife edge acts against an anvil, as shown in U.S. Pat. No. 3,965,786, in which paper stock is cut with a knife edge and a plate wrapped around a cylinder. However, the apparatus disclosed in D'Luhy does not permit both cutting and scoring with the same set of dies.
BRIEF SUMMARY OF THE INVENTION
The present invention relates to dies for cutting and scoring sheet material, such as paper, paperboard, or cardboard, which employ crush cutting, but which also permits both cutting and scoring using the same set of die plates. According to the invention, a knife edge which extends along the desired cutting line engages a land on the opposite die plate which also extends along the cutting line and extends transversely across the cutting line. The land is raised above the bed of the die for a distance greater than the thickness of the material being processed. A pair of scoring lands extend parallel on opposite sides of a scoring line which is offset from the cutting line. The scoring lands extend above the bed of a die for substantially the same distance as the cutting land. A third scoring land is mounted on the opposite die plate and is adapted to move within the gap between the pair of scoring lands to thereby engage the sheet material and force it down into the gap, thereby effecting scoring. Accordingly, crush cutting and scoring are effected by the same set of die plates. Furthermore, the die plates are sufficiently thin and are made out of a magnetic material, such as steel, so that the die plates may be mounted on rotating cylinders and secured thereto by magnetic attraction. According to another advantage of the present invention, the lands and cutting knife edges are formed on the die plates by a process which includes chemically etching the die plate and then using rotary cutting tools to finish the knife edges and the lands.
These and other advantages of the present invention will become apparent from the following description, with reference to the accompanying drawings, in which:
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Baker & Daniels
Rachuba M.
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