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Hitachi MP-1802 Technical Manual page 36

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/ n .
P o s i t i o n i n g
M e c h a n i s m
T h e 4 - p h a s e s t e p p i n g
m o t o r r o t a t e s
1
T h e r o t a t i o n
n o v e m e n t o f t h e s p i r a l
t o s t r a i g h t
m o v e m e n t o f t h e c a r r i a g e
s e t a t t h e d e s i g n a t e d
p o s i t j - o n .
5 d e g r e e s
p e r
s t e p .
w h e e l
i s
c o n v e r t e d
a n d t h e
h e a d i s
6
guide
bar
ide
I
head
F i g . 7 . 1 6
P o s i t i o n i n g
M e c h a n i s m
5 .
H e a d L o a d M e c h a n j _ s m
B y a c t i - v a t i n g
t h e h e a d l o a d s o l e n o i d ,
t h e p a d l o a d ,
s i d e
t h e a d a r m m o v e s a n d t h e p a d S i d e t h e a d p r e s s e s
t h e d i s k .
W h e n t h e s o l e n o i d
i s n o t a c t i v a t e d ,
t h e s p r i n g
s e p a r a t e s
t h e p a d l o a d S i d e t h e a d a r m f r o m t h e d i s k .
F i g . ' 7 . 1 7
spiraL..wbeel
step rrctor
shaft
, . . / 3 / n
H e a d L o a d M e c h a n i s n

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