Ibm 1627 Plotter; Operator Controls, Left Panel - IBM 1800 Operating Procedures Manual

IBM 1627 Plotter
The IBM 1627 Plotter provides an exceptionally versatile,
and easy-to-operate plotting system for the 1800 system.
One 1627 (model 1 or 2) can be attached to the 1800
system and operates under direct program control.
Plotting is initiated by a write command issued to the
1627, causing one word of data to be sent to the 1627.
The data word is converted to incremental pen movement
on the paper surface (y-axis)
andlor
incremental paper
movement under the pen (x-axis).
The pen is mounted in a carriage that travels horizon-
tally (in 1
I
1 OO-inch increments) across the paper. Vertical
plotting is achieved by rotation (in 1/l00-inch increments)
of the pin-feed drum, which also acts as a platen (Figure 17).
The drum and pen carriage are bidirectional; that is,
the paper moves up or down and the pen moves right or
left. Co ntrol is also provided to raise or lower the pen
in relation to the chart surface .
Pen and Carriage
X Axis . , -"""""===~-....!
Paper
Y Axis
Pen tv'otion
Figure 17. 1627 Pen and Paper Motions
Plot "
-Y
Supply
Spool
Take-up Spool
OPERATOR CONTROLS, LEFT PANEL (Figure 18)
Figure 18. 1627 Switches, Left Panel
52
IBM 1800 Operating Procedures
The Vernier Control is provided on the 1627 model 2 to
vary the size of pen carriage increments. In this way, the
pen traverse is adjusted to match the printed scale on the
chart paper which may vary due to high or low humidity.
For work with nonscale paper , the control should be
cen tered at the zero position.
The Carriage Single Step Switch allows the pen carriage to
be moved in single-step increments (I/I00-inch) either
left or right. This allows accurate manual alignment of
carriage along the y-axis of the graph.
The Carriage Fast Run Switch allows the pen carriage to be
stepped rapidly to the left or right at a rate of 120 steps
per second. This switch is used to manually position the
carriage.
The Power On/Off Switch
is used to turn power on or off
in the 1627. The power on light indicates when power is
on in the 1627.