Xerox OLYMPIA ELECTRONIC COMPACT - Page 62

12
L
Vertical positioning
1 full step of motor = 7 .SO = 1/72 in = 0.35a3 mm
8 full steps of motor= 1 line spacing = 1/6 in = 4.23 mm
12 full steps of motor = 1-1/2 line spacing = 1/4 in = 6.35 mm
16 full steps of motor = 2 line spacing = 1/3 in = 8.46 mm
Ribbon motor
For cassette ribbon feed and lift,
11 steps = 82.5° from basic position
in both directions
For correction tape feed and lift,
30 steps = 225° from basic position in one
direction and back.
For the typewheel motor, a bit pattern is transmitted from the CPU
via the port 10 ••• 13 of IC 6 to the 4 control lines. It is
inverted by the inverter IC 9 and switches on the basis of Tr 12 ...
Tr 15. The motor works by changing the bit patterns in order.
Above description also applies to other stepping motors under the
consideration of each switching time and driving device.
Bitmuster/Timing Chart
VH : r:~ hD--rf1--Ch-D£L
O d(6V) I I I 1
1
I I I I I I I t
A H ~1tA~tB..J1c:. ! i' 11 : : l I !
L - ! : ! ! I l I I I -
0 d I I ~ ~I I I I I
B H I JtACtej1c~ I : j ......... : __ ;._...;.: ___ _
6 : : : I I :
A ~ d I Ji J;:tB Jic~ i ! ..___, --
o I I+ I I
B ~ d i J1AJ:1•J1c~
0 I
0
Fig. 5
tA = iO µs canst, t
8
= x ms canst, tc = 130 µs ... 5 ms
Typewheel motor x = 500 ms, horizontal motor x = 1.3 ms,
vertical motor x = 1.6 ms
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