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# Unequal Rotate Angles and Centering of Characters One Unit Less than the Largest Escapement for a Proportional Spacing Type Element

IP.com Disclosure Number: IPCOM000085516D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 42K

IBM

## Related People

Oleksa, SA: AUTHOR [+3]

## Abstract

The side clearances of present proportional spacing type elements are in need of improvement on the 96-character element when multiple copies are being typed. One of the practices in the design of the type characters is to locate the theoretical center with respect to the largest escapement. For example, if the largest escapement is 7 units, the theoretical center line is established with 3-1/2 units on either side.

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Unequal Rotate Angles and Centering of Characters One Unit Less than the Largest Escapement for a Proportional Spacing Type Element

The side clearances of present proportional spacing type elements are in need of improvement on the 96-character element when multiple copies are being typed. One of the practices in the design of the type characters is to locate the theoretical center with respect to the largest escapement. For example, if the largest escapement is 7 units, the theoretical center line is established with 3-1/2 units on either side.

In order to fit the characters on the type element and have them line up properly when printed, the left sides of the characters of all escapement values must line up. Therefore, it can be seen that a 3-unit character, like an "i" is entirely to the left of the center line.

A more efficient use of the area on the typing element is to: 1) place the characters with the center line centered one unit less than the maximum escapement, and 2) achieve the additional escapement space with a larger rotate angle.

The change is diagramatically shown in Fig. 1. In this arrangement, the distance of the C dimension is reduced by 1/2 unit and this decrease increases the effective static side clearance by a small amount which is significant. To accommodate the 7-unit characters, the rotate angle is increased from 15 degrees to 16 degrees. Correspondingly, the remainder of the rotate 24 matrix (4 columns and 24 rows), there will be a larg...