Browse Prior Art Database

Carry Borrow Mechanism for Accumulator

IP.com Disclosure Number: IPCOM000094872D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Wenner, RJ: AUTHOR

Abstract

The same mechanism including carry-borrow arm 14, arm 15, latch 18 and sector gear 20 operates to generate either carries or borrows. This depends upon whether the quantity stored in accumulator wheel 1 is being increased or decreased.

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Carry Borrow Mechanism for Accumulator

The same mechanism including carry-borrow arm 14, arm 15, latch 18 and sector gear 20 operates to generate either carries or borrows. This depends upon whether the quantity stored in accumulator wheel 1 is being increased or decreased.

To add into 1, input arm 24, pivotable about center shaft 25, is lowered until gear 3 engages input gear 2. Add-subtract arm 23, also pivotable about 25, is moved counterclockwise until gear 11 engages idler gear 12 which drives 1. Gear 2 is rotated counterclockwise by an amount representative of the addend and this quantity is transferred to 1 via the gear train 3-4-5-6-10-11-12.

In the condition shown, 1 is set at 9 with carry tooth 13 about to actuate finger 14a of 14. As 1 continues to rotate in a counterclockwise direction from 9 to 0, 13 rocks 14 to the right, causing horizontal slot 14b to act upwardly against pin 16 of arm 15. This causes catch 17 to hook on 18, latching 15 up so that it can no longer interfere with rotation of the sector gear, corresponding to 20, of the next higher order accumulator position. This stores a carry for subsequent transfer into that position. A carry to be transferred into 1 from the next lower order accumulator position is stored by latching up arm 22, corresponding to 15, of that position.

To transfer this carry into 1, 24 is pivoted upwards so that 3 engages the teeth on 20. When carry bail 21 is raised, spring 26 rotates 20 counterclockwise by an amo...