IBM 1627 Manual page 7

Drum Down
Carriage left
Drum Down
Carriage Right
Drum Down
+x
Drum Up
Carriage Left
Drum Up
Carriage Right
Drum Up
Pen
Raise Pen
Lower Pen
NOTE: The figure indicates direction
of plotting movement as viewed from
the front of the plotter. Normally,
graphs are plotted so that their horiz-
ontal axis are, in reality, the axis as
shown above.
Figure 1-2. Direction of Movement Related to Control Digits
FUNCTIONAL DESCRIPTION
The plotter (Figure 1-3) employs a bi -directional
rotary step motor on both the X and Y axis drives.
Each step causes the drum or pen carriage to move
1/100" in either a positive or a negative direction.
The motors are capable of operating at a rate of 300
steps per second (200 steps per second on the 1627
Model 2).
A roll paper feed and take-up mechanism is pro-
vided which accepts chart paper rolls 12" wide by
120' long. The feed and take-up mechanism is bi-
directional. Holes on both edges of the paper are
engaged by sprockets on the drum. Thus the paper
is driven and maintained in accurate registration. If
desired, single sheets of graph paper 8-1/2" x 11" or
11" x 17" can be used for recording instead of the roll
paper.
Six electrical inputs from the operating system
control the recorder in each of the six operating
modes: drum up, drum down, carriage left, carriage
right, pen up and pen down. In addition, front panel
controls on the 1627 are provided for manual control
of each of these modes (Figure 1-4).
1.2
CONTROL SWITCHESAND LIGHTS
As shown in Figure 1-3, seven operating controls and
one indicator lamp are mounted on the front panel of
the instrument. Their functions are described in the
following paragraphs.
Power On/Off
The Power On/Off switch connects 115 volts AC from '----'"
the P5 connector on the rear panel of the recorder to
the cooling fan and the power supply transformer. A
neon indicator, located directly below the switch, is
lighted whenever the switch is on.
Carriage Fast Run
The Carriage Fast Run switch allows the pen car-
riage to be stepped rapidly to the left or right at the
rate of 120 steps per second. The switch may be
used to move the carriage to any desired area of the
graph, or for operational checkout of the carriage
control circuits and the carriage step motor.
Carriage Single Step
The Carriage Single Step switch allows the pen car-
riage to be moved in single step (1/100") increments
either to the left or right. This control, in combin-
ation with the drum single step control, permits the
operator to accurately align the carriage on a point
or fixed coordinate on the graph.
Chart Drive On/Off
The Chart Drive On/Off switch allows the operator
to disable the front and rear chart takeup motors.
This permits the use of single sheets of graph paper
in place of the paper rolls.
Pen Up/Down
The Pen Up/Down switch provides a means of man-
ually raising and lowering the pen from the surface
of the drum.
When the recorder is first turned on, or if the
pen is removed and replaced when the pen is in the
up position, the pen can remain down. When this
occurs, turn the switch first to the down position,
then to the up position.
Drum Fast Run
...
-
The Drum Fast Run switch allows the drum to be
stepped rapidly up or down at the rate of 120 steps