Print Emitter; Timing Disk - IBM 1132 Theory Of Operation

Print Cam-------.
18 Flute Print
Clutch Shaft
Figure 2-4. Print Cam Mechanism
---Print Wheel
Hanger
Latch
Print Cam-----._
, .. ~
-----.._ / ', 18 Flute
Restore
-----~1
, , ·
~
. . r }
Print ' (l \
Clutch
• ', ..../, Shaft
..___.
Lever
,'
Armature
--------1
- - - - - - Print Clutch
Latch
Knock Off Lever
Figure 2-5. Clutch Latch Restore Lever
Print Wheel Hanger
Print Cam Detent \
Print Clutch Dog O
18 Flute
Print Clutch
Shaft
Figure 2-6. Print Wheel Operation
As the hanger and print wheel move toward
the platen, a lug on the hanger is guided by a slot
in the hanger guide. During this time, the print
wheel tends to pivot about its point of contact with
the print wheel drive gear (Figure 2-6). This causes
a secondary rotation in the opposite direction to the
normal rotation. The result is that the print wheel
rotation is almost stopped -at print time.
2.4
Prlht Wheel, Secondary
Rotation About This Point
PRINT EMITTER
Timing Disk
Clamped to the left end of the print wheel drive
gear is the timing disk which has slots used to gen-
erate timing pulses. There are nine rows of slots,
and the outer row has 48 slots, equally spaced.