Static Adjustment Of The Carriage-Tape Brushes - IBM 1403 Field Engineering Maintenance Manual

Space
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Sk ip Stop Impulsed
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Space Stop Impulsed
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Figure 66. Tach-Generator Traces for Skipping Operations
(Does not Apply to Model 6)
Static Ad;ustment of the
Carriage-Tape Brushes
The slow (upper) brushes have been removed on the
Modei 6, and the cabie wiring taped up. Because the
adjustments given on this page apply equally to both
the slow (upper) and the stop (lower) brushes, they
are still valid for the Model 6 printer.
1. Position the tape brushes for a 1" (+
~{',
- 0")
projection from the brush holder (Figure 67). Hold
the range of adjustment as close as possible be-
cause of possible difficulties in timing the stop
brushes to the
E-l
emitter.
70
PROJECTION FROM BRUSH HOLDER
Figure 67. Carriage-Tape Brush Projection
2. Adjust the brush separator for approximate center-
ing of the brushes in the separator slots by turning
the threaded brush-guide pivot shaft in conjunc-
tion with the separator collars. Adjust for minimum
end shake (of the separator) and no binds or inter-
ference when the separator is pivoted out to en-
close the brush tips. Position the threaded portion
of the brush-guide pivot shaft so that the end is
Hush to
J{2"
recessed from the outside surface of
the lock nut.
3. With the unit opened and the brush separator held
pivoted toward the brushes, check for a brush pro-
jection of
Ye" (±
}(l'). Adjust by repositioning the
brushes in the brush blocks. Set the stop brushes
within .010" total variation for the full set within
the
Ye" (± }(..")
range.
4. Adjust the brush blocks so that the toe of the
shorter group of strands Hnes up with the scribed
lines on the brush separator (when the brushes are
held Hush with the Hat portion of the brush sep-
arator).
5. Adjust the brush-frame pivot stud for friction suf-
ficient to hold the brushes in any open (unlatched)
position.
6. Adjust the brush-separator eccentric stop stud for
.050" (± .010") clearance between the brush sepa-
rator and the contact rolls at the scribed line (Fig-
ure 68).