Brush Assembly; Punch Feed; Timing Belts - IBM 1402 Reference Manual

CENTERING
SETSCREW
BRUSH
TIMING
ADJUSTING
SCREWS (2)
BRUSH
ASSEMBLY
PIVOT
PIVOT
OPERATING
SPRING (2)
. BRUSH SEPARATOR
MOUNTING BAR
Figure 3-13. Brush Assembly
c. Allow .003" clearance to prevent binding when
brush assembly is removed or replaced.
4. Adjust brush assembly card guide for .015" to
.050" clearance to lower card guide. See Figure
3-12.
TIMING " '..
Proper timing establishes the proper relationship of
brush to contact roll, punched card hole to brush, and
TO STACKER
SINGLE
SCRIBED LINE
- - -_ _ _ _ --:~ DOUBLE
SCRIBED LINES
Figure 3-14. Brush Timing
3-10
CB impulse to punched card hole.
1. Check that brushes are on scribed line. See
Brush
Assembly, Adjustment.
2. Dynamically check that first and second read
stations are 360°
apart. If not, correct brush block
on which brushes are furthest from scribed line.
3. Dynamically time brushes to wiring diagram by
shifting picker knife timing. Do not time brushes
by shifting them off scribed-line limits. .
a. All brushes must make, dynamically, within
± 2.°
b. Loosen clamp on input pulley to time brushes;
12° brush at 5-time:
M-BO°,
B-92°; 16° brush
at 5-time: M-77°, B-93°.
c. Check and correct RLCB's and SCCB's (if
used ).
Punch Feecl
Timing Belts
""I~
The synchronous tooth of _ the punch clutch should be
used as a reference poi . henever units pertaining to
the punch clutch are' r ' ed. Unless this tooth is
used, timing will be off by 90°, 180°, or 270°.
The synchronous tooth is that tooth whose driving
face is opposite the centerline of one of the three
tapped holes on the outside collar.
Refer to Figures 3-15 and 3-16 for belt locations and
units that must be removed in the event of belt break-
age.