IBM 1627 Manual page 6

INTRODUCTION
The IBM 1627 Plotter, Model 1 or 2 is an incremental
plotter for plotting digital information in any desired
graphic form.
The IBM 1627 Models 1 and 2 are functionally
identical. Physical differences between the two
models are shown in Table 1.
OPERATING CHARACTERISTICS
Under program control, data from the operating sys-
tem must be translated into the appropriate plotter
commands.
Recording Function
The actual recording is produced by the independent
or combined incremental motion of pen or paper as
illustrated in Figure 1-1.
The pen is mounted in a carriage that is capable
of horizontal motion. Control is also provided to
raise or lower the pen to the recording surface.
Vertical motion of the paper is accomplished by ro-
tating the pin feed drum in a forward or reverse
direction. The drum also functions as a platen.
Each command to the plotter causes the pen 'and/
or drum to move 1/100" or the pen to raise or lower.
The direction of movement or action is determined by
the combination of commands given. As illustrated
in Figure 1-2, a Drum Up or Drum Down command
causes paper movement along the X axis; a Carriage
Table 1. IBM 1627 Plotter Specifica tions
SECTION 1 DESCRIPTION
Left or Carriage Right command causes pen move-
ment along the Y axis; combined commands cause
simultaneous motion of pen or paper to produce a
resultant diagonal motion (diagonal motion is 1. 414
times a horizontal or vertical motion); a Pin Up com-
mand causes the pen to raise, while a Pin Down com-
mand causes the pen to lower.
Carriage and drum movements require a mini-
mum of 3.4 milliseconds (ms) of plot time (5 ms min-
imum for Model 2), while Pen commands require
100 ms for the plotter to complete the required pen
motion.
Chart Paper
Supply
Spool
Pen and Carriage
Take-up Spool
~
Figure 1-1. Paper and Pen Motions
MODEL NO.
SPEED
CHART PAPER
X - Axis Y-Axis
Z-Axis (Pen)
Plotting
Sprocket
Width Width Length*
Hole Dim Step Size
300 300
10 Opera- 12"
11" 120' .130" die, 1/100"
I Steps/Sec.
Steps/Sec. tions/Sec.
on 3/8"
Max. Max. centers
200 200 10 Opera-
31" 29.5" 120'
.188" dia. 1/100"
"
Steps/Sec. Steps/Sec.
tions/Sec.
on 1/2"
Max. Max.
centers
*Single sheet short lengths can be used.
1.1