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This article describes a tool for making homing adjustments on conventional single-element typewriter print mechanisms (e.g., the one employed in the IBM SELECTRIC* typewriter).
English (United States)
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100% of the total text.
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Typewriter Adjusting Tool
This article describes a tool for making homing adjustments on conventional
single-element typewriter print mechanisms (e.g., the one employed in the IBM
As seen in Fig. 1, tool 12 includes a handle 14 and flexible arcuate arms 16
that snap onto the lower ball socket 18 of the print mechanism. The lower ball
socket 18 is connected to upper ball socket 20 which supports single-type
element 22. A rod 24 connects lower ball socket 18 with pinion gear 26. The
teeth of pinion gear 26 mesh with the teeth on both sides of rotate rack 28. As
seen in Figs. 1 and 2, rotate rack 28 pivots in the direction of arrow Y to make
contact with pinion gear 26.
During head-homing or pin-block setting, any rotational movement of pinion
gear 26 will create a corresponding amplified back and forth movement of handle
14, as represented by arrow X. When set screw 30 is adjusted properly, rotate
rack 28 will be aligned with respect to pinion gear 26 and no motion X of tool 12
will be detected when rotate rack 28 is pivoted in the direction of arrow Y. *
Trademark of IBM Corp.
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