Paper Transportation - Star Micronics LS-5 SERIES Technical Manual

3-2. Paper Transportation

[1] MBF Sensor (MBF: Multi-sheet Bypass Feed):
Detects the presence of sheets of paper in the multi-purpose tray (front tray assembly) according to change in the
position of MBF actuator. It assumes ON state when the presence of the paper is being detected.
[2] Pick up Solenoid:
Controls operations (rotation and stop) of the pick up roll assembly.
[3] Pick up Roll Assembly:
Activation of the pick up solenoid causes the spring clutch of the pick up roll assembly to be fixed and rotate due to
the drive from the drive assembly, causing the cam of the pick up roll assembly to operate the bottom plate assembly
vertically, thus the pick up roll of the pick up roll assembly delivering sheets of paper from the multi-purpose tray
(front tray assembly).
One full rotation of the pick up roll assembly causes the spring clutch to be released, thus disabling the drive from
the drive assembly from being transmitted.
A pinch roll corresponding to the take away roll of the take away roll assembly is also mounted.
[4] Inlet Chute Assembly:
Comprises an inlet chute and a regi. sensor.
• Inlet Chute:
Not only serves as a paper path but moves the electrical charge of pretransfer sheets of paper to the earth by a
metallic plate, improving transfer efficiency.
• Regi. Sensor (Regi.: Registration):
Detects the state of paper transportation in the inlet chute area. It assumes ON state when the presence of the paper
is being detected.
[5] BTR Assembly (BTR: Bias Transfer Roll):
The BTR, a component, comes into contact with the EPX toner cartridge drum, impresses the positive electrical
charge from the back of sheets of paper, thus transferring toner on the drum surface on them.
[6] Trans. Chute Assembly (Trans.: Transport):
It not only serves as a paper transport path but moves to the earth the electrical charge of post-transfer sheets of paper
and that from the BTR by means of the eliminator.
[7] Console Assembly:
Performs various display by means of the LCD and various inputs with the key switch.
[8] Lower Chute Assembly:
Comprises a take away roll assembly and a retard pad assembly.
• Take Away Roll Assembly:
Transports sheets of paper to the drum by the take away roll of the take away roll assembly.
• Retard Pad Assembly:
Prevents duplicate paper transportation during paper delivery by the pick up roll assembly.
[9] Link Assembly:
Not only regulates the opening of the front cover assembly but depresses the interlock switch of the LVPS assembly
when the front cover assembly is closed, opening the drum shutter of the EPX toner cartridge.
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THEORY OF OPERATION