Browse Prior Art Database

Decimal Tab Typewriter

IP.com Disclosure Number: IPCOM000074404D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Palmer, LE: AUTHOR

Abstract

It is customary to type a column of decimal numbers with the right side of the column vertically aligned. This function is simplified by a special tab key that selects a "right-to-left" typing mode. Depression of the special tab keylever 17 moves the print point to the right edge of the column. As numbers are keyed in reverse order the print point spaces to the left on the page. Carrier Return or a regular Tab operation return typewriter to normal.

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Decimal Tab Typewriter

It is customary to type a column of decimal numbers with the right side of the column vertically aligned. This function is simplified by a special tab key that selects a "right-to-left" typing mode. Depression of the special tab keylever 17 moves the print point to the right edge of the column. As numbers are keyed in reverse order the print point spaces to the left on the page. Carrier Return or a regular Tab operation return typewriter to normal.

An advantage of this mechanism is the use of the right hand side of the number column as a starting point for typing numbers. It should be as simple for the operator to read the numbers backward as forward. Also, it is normal to work from right to left when performing addition, subtraction and multiplication and the machine is in the proper mode for typing the results.

The drawing illustrates appropriate mechanism as applied to a typewriter like that described in U. S. Patent 2,919,002.

A filter shaft 1 has a cam 2 which operates on bellcrank 3 and a link 4 to operate part 5 and disconnect 6 for rocking the escapement torque bar 7. This action normally provides escapement for the print point. If the lower end of disconnect lever 6 is moved to the left by cable 8, the escapement linkage will go through the motions without rocking torque bar 7. Backspace keylever 9 operates through keylever pawl 10 to trip off a backspace cam latch, not shown, through backspace interposer 11 which causes the machin...