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Inertia Detent

IP.com Disclosure Number: IPCOM000091040D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Green, CD: AUTHOR [+2]

Abstract

Using a dual card path, pressure roll 10 is pivoted either upward to cause feed wheel 11 to drive card 12 or downward to effect a driving relation between feed wheel 13 and card 14. Pivoting of idler 10 is accomplished by actuating one of magnets 16 and 17 to attract armature 20. Upon release, armature 20 is restored to the vertical position by detent pin 22 carried by detent mass 24 which is supported by leaf-spring 26. If overtravel occurs during restoration, roll 10 can achieve a driving position with respect to the card disposed in the opposite card path, giving rise to a misfeed. While spring 26 has a reduced effectiveness as the low point at the intersection of the surfaces 28 and 29 forming the detent is approached, the inertia of the accelerating mass 24 increases.

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Inertia Detent

Using a dual card path, pressure roll 10 is pivoted either upward to cause feed wheel 11 to drive card 12 or downward to effect a driving relation between feed wheel 13 and card 14. Pivoting of idler 10 is accomplished by actuating one of magnets 16 and 17 to attract armature 20. Upon release, armature 20 is restored to the vertical position by detent pin 22 carried by detent mass 24 which is supported by leaf-spring 26. If overtravel occurs during restoration, roll 10 can achieve a driving position with respect to the card disposed in the opposite card path, giving rise to a misfeed. While spring 26 has a reduced effectiveness as the low point at the intersection of the surfaces 28 and 29 forming the detent is approached, the inertia of the accelerating mass 24 increases. When mass 24 collides with the opposite of detent surfaces 28 and 29, which would induce a change of direction, the armature velocity is abruptly reduced and armature 20 is stopped at the preset position. While providing for rapid termination of armature movement, the structure permits easy actuation in either of the pivotal directions.

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