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Alphameric printing. When the program calls for
the capability of printing any of the 48 characters,
printing speed is lessened. Print scan cycles must
be taken for each character of the entire print wheel.
Then the delay required for completing mechanical
printing action and the carriage space must be pro-
grammed. The next print operation can not be
started until the print wheel has moved approxi-
mately 1/3 revolution further. (Figure 1-2.)
Further extension of the timing chart would show
that approximately three print instructions can be
completed during four revolutions of the print
wheels.
These considerations are the basis for calcula-
ting maximum printer speeds. Output format and
programming can be seen to have a definite effect on
printing speeds.
Forms Control
Forms feeding is provided by a tape-controlled car-
riage and forms tractor. A manual control lever on
the feed tractor allows selection of 6 or 8 lines per
inch spacing. The carriage can be controlled to
move the forms a· single line space or a distance
determined by the punching in a control tape. Oper-
ator control keys for the carriage are Carriage
Space, Carriage Restore, and Carriage Stop.
Forms Control Instructions
On-line forms feeding is under control of the using
system program instructions. A brief description
of typical instructions follows.
Sense Device. This instruction senses the operating
status of the carriage:
1.
Is the carriage busy?
2.
Is there a skip or space response condition?
3.
Which control tape channel punch was read?
Space. This instruction signals the carriage to ad-
vance the forms one line space.
Start Carriage. This instruction starts a carriage
skip and forms are fed until a Stop Carriage instruc-
tion is given.
Stop Carriage. When the using system determines
that the desired control tape punching has been
sensed, the Stop Carriage instruction is given. This
stops paper movement and the printer can respond to
further instructions.
Ribbon Control
Ribbon feeding is continuous when the 1132 printer
motor is running. A reversing device operates when
all the ribbon has been fed onto either ribbon spool.
Operator_ Controls (Figure 1-3)
Figure 1-3. Operator Control Keys and Lights
Print Wheel Rotation
I...,
• - - - - 1 s t Revolution----•• ... , ... - - - - 2 n d Revolution
----.•-+1~•----
3rd Revolution----• ... , ... ----'
) ...... .,.._ - - - - - 48 Scans
-----•~1
. . . . . . . . . .
18 Scans-•
.._t •• - - - - -
48 Scans
-----1•~1
. . . . . .
-10 Scans+- 48 Scans
4
(Print)
(Delay)
t
(Print)
(Delay)
(Print)
1st Start
2nd Start
3rd Start
Print
Print
Print
Instruction
Instruction
Instruction
Program Instruct Ions
Figure 1-2. Alphameric Printing
1. 3
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