The Eccentric Segment; The Pressure Wheel Assembly; The Upper Mounting Plate; The Pressure Wheel Assembly, Exploded View - TANDBERG 12 Service Manual

4.1.2 The eccenlric segmenl
T h e e c c e n t r i c s e g m e n t ( 5 9 . 1 7 ) i s l o c a t e d u n d e r n e a t h
t h e u p p e r m o u n t i n g p l a t e ( 7 1 . 2 ) , a n d i s c o n n e c t e d t o
t h e o p e r a t i n g l e v e r ( 5 4 . 1 ) . R e f . f i g . 9 a n d 1 0 .
The eccentric segment (59.17) moves the pressure
w h e e l a s s e m b l y ( 5 . | . 3 ) w i t h t h e p r e s s u r e w h e e l ( 5 l . l "
a g a i n s t t h e c a p s t a n ( 6 6 . 2 ) w h e n t h e o p e r a t i n g l e v e r
( 5 4 . ' l ) i s b e i n g s e t t o n o r m a l f o r w a r d d r i v e .
T h e l i f t i n g a r m ( 5 9 . . l 8 ) i s l i n k e d t o t h e e c c e n t r i c s e g -
m e n t ( 5 9 . 1 7 ) a n d r e l e a s e s t h e s p e e d t r a n s f e r w h e e l
( 5 3 . 1 ) f r o m c o n t a c t i n g t h e m o i o r p u l l e y ( 6 2 . 1 ) i n a l l
operating modes, except in the normal forward drive
p o s i t i o n .
+
F i g . 9 . T h e u p p e r m o u n l i n g p l o l e , b o l l o m v i e w .
Adiustments
Adiust the return
s e m b l y ( 5 1 . 3 ) b y
m o t i o n o f t h e p r e s s u r e w h e e l a s -
b e n d i n g t h e l u g ( A ) r e f . f i g . 9 t o
a s c e r t a i n e a s y t h r e a d i n g o f t h e t a p e i n t h e s l o t b e -
tween the two trim covers (73.1 , 73.2). The tape
s h o u l d n o t s t i c k a g a i n s t t h e p r e s s u r e w h e e l ( 5 I . l ) d u r -
i n g t h e t h r e a d i n g .
4.1.3 The pressure wheel assembly
T h e p r e s s u r e w h e e l a s s e m b l y ( 5 1 . 3 ) i s g u i d e d i n t o
o p e r a t i n g p o s i t i o n b y t h e e c c e n t r i c s e g m e n t ( 5 9 . 1 7 )
w h e n t h e o p e r a t i n g l e v e r ( 5 4 . 1 ) i s m o v e d t o n o r m a l
f o r w a r d d r i v e .
T h e p r e s s u r e w h e e l ( 5 1 . 1 ) i s m o u n t e d u n d e r b a l a n c e d
s p r i n g t e n s i o n , w i t h t h e p r e s s u r e w h e e l s h a f t ( 5 1 . 2 )
r u n n i n g t h r o u g h t w o o b l o n g s l o t s i n t h e p r e s s u r e
w h e e l b r a c k e t ( 5 L I 2 ) . T h i s m o u n i i n g g i v e s t h e p r e s -
s u r e w h e e l ( 5 1 . 1 ) a p p r o x . 6 m m ( t / a " ) h o r i z o n t a l
s p r i n g l o a d e d p l a y , o n a l i n e p e r p e n d i c u l a r t o t h e f r o n t
o f t h e u p p e r m o u n t i n g p l a t e ( 7 1 . 2 ) . R e f . f i g . 1 0 .
Adiustments
T h e b a l a n c e d s p r i n g t e n s i o n o f t h e p r e s s u r e w h e e l
( 5 1 . . | ) i s a d j u s t e d t o o b t a i n u n i f o r m p r e s s u r e o f t h e
pressure wheel against the capstan. Loosen screw E,
a n d t u r n t h e s p r i n g e q u a l i z a t i o n l a t c h ( 5 1 . 1 l ) c l o c k -
w i s e o r c o u n t e r c l o c k w i s e u n t i l t h e t a p e r u n s s m o o t h -
l y b y t h e p r e s s u r e w h e e l ( 5 l . i ) i n n o r m a l f o r w a r d
drive. Make sure that no air-pockets are formed be-
t w e e n t h e t a p e a n d t h e p r e s s u r e w h e e l ( 5 l . l ) a n d
that the tape is completely covered by ihe rubber sur-
f a c e o f t h e p r e s s u r e w h e e l . R e f . f i g . l 0 a n d I 1 .
1 0
l (
t
F i g . I 0 . T h e p r e s s u r e w h e e l
o s s e m b l y , e x p l o d e d v i e w .
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