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PRINTER
Timing detecting
4 Carriage return and paper feeding
When the type for the top column in one line print-
ing, the carriage return and paper feeding are per-
formed
by adding the timing pulse interval TW2
between TPn and TPn + 1 and the value equivalent
to six times as large as the TP interval TW1 measured
for the type selection for the first column in Item
2 above to the width of the trigger coil drive pulse.
5 Turning the motor OFF
(5) Qui
1
ick paper feeding
The paper is fed the first one line in the same manner
as in the case of 2 in Item (4) "Paper feeding for
one line'',
For printing of the lines from the second line on,
the subsequent timing pulse TP is counted while the
motor
is running, whereby permitting the selection
of the empty
type (TP10)
from
the twenty-first
pulse generated,
as in the case of 2 in Item
(4)
Timing pulse TP
(3) Continuous printing
Drum Pattern
RPo
1 The first line is printed
in the same
manner
as in
the case of the first line in [tem (2) above.
2 For printing of the lines from the second line on,
the subsequent
timing
pulse TP is counted while
os
the
motor
is running,
whereby
permitting
the
Fig, 26
printing
of the
first
column
in the
second
line
PRINTER OPERATION
DURING ONE
after the twenty-first pulse is generated, as in the
PRINT CYCLE
case of "Printing of one
line' 2 , 3 and 4 in
Item (2) above.
The printer operation during one print cycle is described,
3 Continuous printing is performed by repeating the
referring to Fig, 25.
operation described in 2 above.
(1) Initialization
4 Turning the motor OFF
.
It is necessary to perform the required initialization
The operation described in 5 of Item (2) above
Prior to printing or paper feeding in orded to con-
is performed. (The motor is turned OFF for one line
firm that the carriage remains in the waiting state (for
printing.)
the first column). The initialization is finished by feed-
(4) Paper feeding for one line
ing the paper by one line.
1 The timing pulse TP after starting the motor by ap-
Detection wheel -
(2) Printing of one line
plying the motor drive pulse signal is counted, and
Fig. 27
1 The printer counts the timing pulse TP after apply-
the reset pulse RP after counting the eighth pulse
ing the motor drive pulse signal to run the motor.
is set as RPo and the first timing pulse TP after the
The reset pulse
RP after counting
eight pulses is
19
18
$7
{6
1§
14
33
12
I!
10
9
Reset pulse RP
reset pulse RPo is generated is set as TPo.
Apply
the trigger
coi! drive pulse to the trigger
is measured to obtain TW1.
It is made possible to
magnet between
the timing pulses TPn and TPn +
select the empty
type on the print wheel and to
1 which correspond to the desired type.
feed the paper
by adding the measured
TW1
and
Simultaneously,
measure the timing pulse interval
the value equivalent to six times as large as TW1 to
between TPn and TPn + 1 to obtain TW1.
the width of the trigger coil drive pulse.
wheel
will stop
(the timing pulse remains to be
After the paper has been fed for one line, the print
TPn + 1) and advancement will be performed auto-
wheel
starts
running,
and
the motor
drive pulse
matically.
signal is interrupted as the fourteenth timing pulse
3 Selection of type for the next line
TP generated after counting the timing pulses from
The print wheel starts running again to cause the
the first timing pulse generated.
a6
.
Gen
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