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Hitachi MP-1802 Technical Manual page 37

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6 .
S o f t
L a n d i n g
M e c h a n i s m
W h e n t h e
d o o r
i s
c l o s e d ,
t h e
s h a f t
i s
p u s h e d
a n d t h e
a r m
w h i c h
i s
c o n n e c t e d
t o
t h e
s h a f t ,
p r e s s e s
d o w n t h e
h e a d
l o a d
s o l e n o i d .
A t
t h e
s a m e t i m e ,
t h e
h e a d a r m o n t h e
p a d l o a d
S i d e
1 c o m e s d o w n a n d r e d u c e s
t h e
d i s t a n c e
b e t w e e n t h e
S i d e
t
h e a d a n d t h e
S i d e
0 h e a d ,
B e c a u s e o f t h i s ,
t h e m o v i n g d i s t a n e e
o f t h e S i d e t h e a d
a r m i s
s h o r t e r
f o r
h e a d l o a d w h i c h r e s u l t s
i n m i n i m i s e d
i m p a c t t o t h e d i s k .
shaft
F i g . 7 . 1 8
S o f t L a n d i n g M e c h a n i s n
( / r )
C i r c u i t
E x p l a n a t i o n
I n p u t
S i g n a l s
1. ffiiEm.T'; ffieT-T
o
W h e n S i l E e T - - I = n l f r ( i = 0 , 1 ) ,
t h e o t h e r i n p u t
D r i v e i m a k i n g s e n d i n g / r e c e i : v i n g p o s s i b l e .
M6'ffiT,
ffi
signals
do not depend
S E f E m T
s i g n a l a n d r e c e i v i n g
i s p o s s i b l e . )
s i g n a l
o f t h e
( H o w e v e r , t h e
o n t h e
. . . / 3 5

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