Ribbon Feed Mechanism (Hi) - Centronics 101A User's & Technical Manual

B.
FORM FEED MECHANISM
RIBBON FEED MECHANISM
1. To adjust proper distance of armature slide (HH-3) to hold raised
tab on paper feed clutch, inner cam (HH-14) prior to line feed
release, perform the following steps:
a. Loosen screws (HH-86) and washers (HH-82) on clutch magnet
frame (HH-96) mounted to paper feed chassis (HH-8l).
b. Slide magnet Trame on paper feed chassis slots so that the
distance between slide and tab on inner cam (HH-14) is from
0.2 to 0.3 mm (0.007-0.0l1-in.). Tighten screws and washers.
C. Timing Belt (HH-28)
1. The timing belt (HH-28) located between FF idle gear (HH-27)
and pin feed pulley (HF-14) has the following adjustment.
a. Loosen three nuts (HH-70) holding right chassis (HH~81)
to left frame chassis (HE-86). (Rotate left frame to
change tension on belt).
b~
For proper tension of timing" belt (HH-28) move belt
downward 3-5.millimeters (0.118-0.196-inch) when load of
100 grams (3.5 ounces) is applied on belt at mid-point
between both pulleys.
c. Tighten three support nuts at chassis (HH-81).
5.2.10 RIBBON FEED MECHANISM (Figure HI)
5.2.10.1 Operation
A. Ribbon Movement - Forward Clutch Drive
Torque for feeding ribbon is transmitted from shaft (HB-50)
while head is" moving from left to right as clutch spring (HI-4)
engages sleeve (HI-5) mounted on shaft (HB-50). Above torque
is transmitted to ribbon as follows:
B. Ribbon Feed Mechanism (From Front of Printer)
1. Drive-Right Side
Shaft (HB-50) - clutch gear (HI-I) - driving gear (HI-75),
bevel gear (HI-8l) - driving bevel gear (HI-18) - sleeve
(HI-20) - driving slide shaft A, (HI-l03). . . . (a)
bevel gear (right-hand) (HI-27) - bevel gear (right) (HI-43)
ribbon spool shaft (right) (HI-38) - ribbon.
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