– 29 –
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
Содержание LC-8521
Страница 1: ...DOT MATRIX PRINTER LC 8521 TECHNICAL MANUAL THIRD EDITION ...
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Страница 101: ... 97 Blank Page ...
Страница 102: ... 98 4 Wiring Scheme of Printer ...
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Страница 104: ... 100 5 Electrical Parts 5 1 Main Logic Board 5 1 1 Circuit Diagram ...
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Страница 107: ... 103 Blank Page ...
Страница 108: ... 104 5 1 2 Component Layout ...
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Страница 116: ... 112 5 4 Power Supply Unit 5 4 1 Circuit Diagram ...
Страница 117: ... 113 5 4 2 Component Layout ...
Страница 120: ... 116 6 Serial Parallel Converter Board Option 6 1 Wiring Scheme ...
Страница 122: ... 118 6 3 CPU Board 6 3 1 Circuit diagram ...