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Matched Speed Adjustable Bearer Ring Die Modules

IP.com Disclosure Number: IPCOM000009493D
Publication Date: 2002-Aug-28
Document File: 8 page(s) / 123K

Publishing Venue

The IP.com Prior Art Database

Abstract

This publication discloses a matched speed bearer ring die module and a method to reduce cutter tip scrubbing. As a result, the manufacturing cost per cut is reduced by the new module. The method uses an adjustable bearer ring die module and proper configuration of the bearer rings to increase module life between sharpening intervals.

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Matched Speed Adjustable Bearer Ring Die Modules

June 27, 2002

Summary

This publication discloses a matched speed bearer ring die module and a method to reduce cutter tip scrubbing.� As a result, the manufacturing cost per cut is reduced by the new module.� The method uses an adjustable bearer ring die module and proper configuration of the bearer rings to increase module life between sharpening intervals.

Background

There are many types of rotary die modules used in industry today.� Two common examples are flat bearer ring and sliding taper wedge block die modules.� Adjustable bearer ring die modules are a hybrid of these two popular designs.� Adjustable bearer ring die modules use bearer rings to maintain cutter gap spacing while providing a taper on the bearer rings permitting cutter/anvil gap adjustment.� The bearer rings on the cutter are usually used to drive the anvil roll assembly. The adjustable bearer ring dies use a pair of tapered bearer rings that are oriented such that lateral shifts in one set of bearer rings adjust the cutting gap.� Normally, the bearer rings on the flat roll are the set shifted.� These types of modules are available from companies such as Schober GMBH.�

When utilizing the matched speed concept with an adjustable bearer ring design, one can truly incorporate the best of both design types.� By maintaining the diameter of the cutter and anvil equal to each roll’s taper bearer ring effective diameter, you ensure a matched speed occurs between the cutter tip and the anvil roll surface.� � Simply stated, the cutter is driven at a constant angular velocity in this type of die cutter module.� Therefore, if the cutter tip diameter is equal to the cutter roll taper bearer ring effective diameter, the true cutter tip speed is transferred to the anvil taper bearer ring.� In this design, the anvil and the anvil taper bearer ring are a rigid body with a common center of rotation.� Assuming no slip occurs at the bearer ring point of contact, maintaining the anvil roll and anvil taper bearer ring diameters to be equal ensures a common surface speed from the cutter tip to anvil surface.�

Two important objectives for long term die cutter operations are maximizing the die cutter life and achieving the lowest cost per cut for continuous operations.� Current adjustable bearer ring designs do not match the cutter-anvil speed relationship very well over the full range of module adjustment.� This speed mismatch results in the cutter tip scrubbing the anvil surface and accelerating cutter tip wear. � Matched speed adjustable bearer rings improve the speed match of the cutter tip to the anvil roll over the full operating range.� The matched speed adjustable bearer ring modules match bearer ring-anvil speeds more like flat bearer ring die modules, while reducing scrubbing of the cutter tip on the anvil surface.� The matched speed adjustable bearer ring modules also provide an increased range of operation seen on the sliding taper wed...