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A special vertical alignment print character is employed in conjunction with typewriter manufacture to provide a readily apparent visual indication of the degree of misalignment of a printer assembly.
English (United States)
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Vertical Alignment Print Character
A special vertical alignment print character is employed in conjunction with
typewriter manufacture to provide a readily apparent visual indication of the
degree of misalignment of a printer assembly.
A special type element 11 incorporates special print character 13 in order to
provide a visual indication of the degree of misalignment of a print mechanism
during assembly of a printer. The special character 13 consists of nine horizontal
bars, the top and bottommost bars being 0.1 inch long and each successive bar
going towards the center of the character being shortened, with the center bar
forming a dot. Each bar is engraved to a different depth, as depicted in Fig. 3, so
that the impact surface is flat. The character has an appearance of an "X" shape
when viewed face on, as indicated in Fig. 2.
A printer, such as the IBM Model 50 typewriter, is assembled
from modular components which are tested or exercised prior to final
assembly. The special character is used during exercise of the print
module while printing on a platen adjusted to a nominal "0" position.
The operator determines the relative impact point by the appearance
of the printed character printed from the special character 11. The
amount of misalignment, if any, is then noted, and the platen of the
final machine into which the print module is inserted is adjusted to
the noted value rather than nominal "0", thereby eliminating lengthy
adjustment trial and error proce...