Die Cut Waste Trim Removal Apparatus
Publication Date: 2002-Nov-14
The IP.com Prior Art Database
An improved method and apparatus is disclosed for processing waste trim internally through a cavity located in the center of the knife roll using a stationary tube with high velocity vacuum.
To meet today’s increased speed requirements and efficiencies this publication will discuss an improved method and apparatus for processing waste trim internally through a cavity located in the center of the knife roll using a stationary tube with high velocity vacuum.
Previously, waste trim pieces were removed from the knife roll's outside periphery by means of a vacuum assisted duct (see Figure 1).� This method is historically speed limited and plagued with other process related issues attributing to increased machine waste and delay.
Recent advances in large knife roll technology have allowed large pieces of trim to be removed efficiently through an internal duct.� However, when small pieces are removed in a larger opening an improved system is needed.
Figure 2 illustrates the improved trim removal apparatus.� The hollow rotating knife roll comes in contact with the anvil roll creating a cutting action.� Waste segments are created as a result of this process.� Openings in the knife roll face and internal stationary tube, by the use of vacuum, draw the waste into the roll cavity.� The stationary tube with an outside diameter slightly smaller than the roll inside diameter is positioned in the knife roll cavity.� The tube may or may not be supported on both ends.� If support is required on the end projecting into the roll, a bearing can be used that rides on a rotating internal projection while the other end is fastened to the knife rol...