Browse Prior Art Database

Paper Shearing Mechanism

IP.com Disclosure Number: IPCOM000076571D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Gould, DW: AUTHOR

Abstract

A paper cutting knife is disclosed where the moving shear blade 10 is mounted by fasteners 12 to a pivoting shaft 16. Surrounding fasteners 12 and between shear blade 10 and shaft 16 are located elastomeric washers 14. Shaft 16 is connected through eccentric links 18 (rigidly joined) to power shaft 20. Extending between power shaft 20 and shear blade 10, are three compressed coil springs 22 to act as a biasing force on shear blade 10.

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Paper Shearing Mechanism

A paper cutting knife is disclosed where the moving shear blade 10 is mounted by fasteners 12 to a pivoting shaft 16. Surrounding fasteners 12 and between shear blade 10 and shaft 16 are located elastomeric washers 14. Shaft 16 is connected through eccentric links 18 (rigidly joined) to power shaft 20. Extending between power shaft 20 and shear blade 10, are three compressed coil springs 22 to act as a biasing force on shear blade 10.

Stationary shear blade 24 is positioned perpendicular to the paper path. The paper normally is fed between shear blade 10 and shear blade 24. When a cutting operation occurs, power shaft 20 is rotated in a clockwise direction, when viewing the leftmost end of shaft 20, thus rotating eccentric links 18 to translate shaft 16 on a circular path. Coil springs 22, acting against shear blade 10, keep the tab, 11 of shear blade 10, in rubbing contact with stationary shear 24. As shaft 20 is rotated, shear blade 10 descends to cut the paper.

To eliminate the requirement of a high force being exerted on shaft 20, the cutting edge of movable shear blade 10 is slightly inclined so that as the blade descends, the point of engagement between the cutting edge of shear blades 10 and 24 progresses from left to right in the figure. Additionally, to insure a running edge contact, the blade is supported on five fasteners 12 which then force the blade against elastomeric washers 14. Additionally, in order to secure a moving poi...