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Mechanical Document Stop

IP.com Disclosure Number: IPCOM000078443D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Jakubowski, M: AUTHOR

Abstract

This mechanical stop is particularly useful for stopping documents which have a wide range of sizes and/or weights such as, for example, stopping letters in a high-speed mail sorter.

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Mechanical Document Stop

This mechanical stop is particularly useful for stopping documents which have a wide range of sizes and/or weights such as, for example, stopping letters in a high-speed mail sorter.

The device consists of a number, e.g. eight, of thin spring steel sheets 1-8. The sheets are bonded in pairs 1-2, 3-4, 5-6, and 7-8 with a very highly damping structural bonding material 9. The bonded pairs are then assembled into a stack in parallel alignment. The amount of the bonding material 9 is selected so that each bonded pair of sheets becomes critically damped, or over-damped when oscillating in the cantilever mode. The thickness of the first pair 1-2 is selected so that its effective mass is smaller than that of the lightest document to be stopped. The subsequent pairs can be progressively heavier. The whole assembly is backed by a rigid solid plate 10. Spacers 11 are provided between the bonded pairs and the back plate 10.

In operation, the documents are fed singularly and edgewise in the direction indicated by the arrow A and normal to the planes of sheets 1-8 in their respective neutral positions. When the leading edge of a light document impacts the stop, it loses most of its kinetic energy which is transferred into the motion of the first pair 1-2 of the damped sheets. As the damping is critical or preferably higher, the energy is absorbed in the first one-half of the oscillation cycle and the sheet pair 1-2 returns slowly to its neutral positi...