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High Speed Movement from Stop (Tab or Skip Operation)
4-30
When stopping from a high-speed tab or skip operation,
the stepper motor slows to normal speed as described
in High-Speed Print Head Movement from Normal Speed
(Tab or Skip Operation) and then stops normally.
On 40 cps and 80 cps printers, the print head can be
moved in either direction at high speed when printing is
not in progress; this operation is called a high-speed
tab or skip. On 120 cps printers, high speed is the
same as printing speed (see Basic 40 cps and 80 cps
Carrier Control and Basic 120 cps Carrier Control
timing charts). A normal start sequence begins the
operation. Then, the carrier stepper motor advance
pulses are gradually increased to a 2.15 ms rate.
High·Speed Movement from Stop (Tab or Skip Operation) for 40 cps and 80 cps Printers
Start sequence
begins here
~MOVing
Right to Left
Start of high speed
return sequence begins
here.
' "
I - u p . to-speed advances
There are five
:
I
J
- - . ,
~2.15
ms
I
3.27
ms steps.
I
~~12.6~1
1
...J
3.0
ms
I
Ims~
~13.271"'-
,ms
I
---..1 •••
....-1
-J3.271~
1
I
1
0
1
ms
I
I
1
The stop sequence begins
"I
here
(1
motor advance
to the left of left margin).
~Settle
time-+i
I
~I ~s
1"-1
I
I
I
~i
5.2
r
I
1
I
I
The 'left margin' line ...........
I
I
~
5.8
I~
I
I
I
1
1
could become active on
' I
1
~ 4.6
I':S
1
I
1
1
1
1
any of 4 conditions.
I
Left margin _ _ _ _ :
---I(
l
1
ms
I
I
I : Uf--:-I
--:------:---:----------il
\1-)
--I
---t
--:--~)~!--~~--~~--.~l
....
--~~
..
~------~
..
)~) ---~
l (
I
t (
-t
a :
l (.' --....;1
A
I
1 .
I
A
Carrier
Drivers
B
) 1
\~
) )
,
----~( (~----~
. . . . . .
L------~
. .
~~~L-------~ . . . . ~------~ . . . . . . ~l (~~".t
B
It
-t
(~) ---~?
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