Star Micronics LC-8521, Technical Manual

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Change lever
Rear release arm
Detector [2]
Detector [1]
Front release arm
Clutch gear
Release lever
Tractor clutch lever
Position of release lever [1] [2] [3]
Paper feeding method Tractor (Front) Friction Tractor (Rear)
Detector [1] OFF ON ON
Detector [2] ON ON OFF
Engaement of the clotch gear (Left) Not linked Not linked linked
Engaement of the clotch gear (Right) linked Not linked Not linked
Status of the PF roller and PF roller (Front) Not Pressed Pressed
Status of the PF roller and PF roller (Rear) Pressed Pressed Not
4-4. Paper Feed Mechanism
The turn of the paper feed motor is transmitted to the PF (Paper Feed) roller and tractor unit via the release lever, front-
rear release arm, tractor clutch lever, clutch gear and change lever. The paper feed motor is a HB (Hy Brid) 4-phase and
96 pulse motor. The changing of the rotational direction depends on the detectors on Frame L.
There are threeways of feeding paper into the printer : the friction method, the tractor (front) method and tractor (rear)
method. You can select the method you want to use by setting the release lever.
Fig. 2-8 Paper Feed Mechanism
[1]
[3]
[2]
Tractor (Front)
Tractor (Rear)
Friction
Release Lever
PF Roller (Rear)
Clotch gear (Right)
PF Roller (Front)
Clotch gear (Left)
Fig. 2-9 Frame L