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Carriage
Line Space Operation
The printer has a pin feed carriage driven by a
stepper motor (general stepper motor operation
is described in Appendix B). The carriage spaces
six lines per inch. Skipping and spacing are
controlled by the attachment circuitry.
The carriage go line gates the carriage oscillator.
The carriage oscillator, in turn, generates the
carriage advance pUlses. The carriage advance
pulses generate the drive lines (A,
A,
B,
B)
that
control the carriage motor. Each carriage ad-
vance pulse advances the drive by one incre-
ment. Eight increments are required to ad-
vance the carriage one space.
When carriage go goes inactive, after six carriage
advance pulses, two more advance pulses are
generated. The carriage is allowed to come to
a stop without overshooting by delaying the
last two carriage advance pulses.
The keyboard functions that control the carriage
are:
•
Carriage restore
•
New line
•
Reset line counter to 1
Carriage Go
Carriage Advance
A
B
Carriage Go
(carriage oscillator)
Note: ±1 0% tolerance on all times unless otherwise note.
Carriage
A
Carriage
Carriage Advance
Shift
B
Advance
Register
A
Digital
Inh Detent
and
Control
Carriage
B
Drive
Belt Printer
50, 100, and 155 Ipm
4-7
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