Functions Of Main Parts; Cassette Feed - Star Micronics LS-5 SERIES Technical Manual

3.

Functions of Main Parts

The following are brief descriptions with corresponding illustrations of the main parts. They are divided into the following
five blocks according to their architecture:

1. Cassette Feed

2. Paper Transportation
3. Fusing and Paper Exit
4. Drive and Photographics
5. Electrical
3-1. Cassette Feed
[1] Paper Cassette:
A cassette to hold cut sheets of paper.
Aligning the paper guide in the rear side to the paper causes the cam in the right rear to rotate, thereby changing the
location where the size spring is pressed.
A pinch roll corresponding to the turn roll of the turn roll assembly is also mounted.
[2] Feeder PCB (PCB: Printed Circuit Board):
The paper size switch and the no paper sensor are directly mounted on the board, the former detecting the cassette
paper size and the presence of the paper cassette with a combination of ON and OFF operations of the switches
according to the changes in the location of the size spring and the latter detecting the presence of sheets of paper in
the paper cassette.
With the no paper sensor, the state of the presence of sheets of paper being not detected shall be OFF.
[3] Feed Solenoid:
Controls operations (rotation and stop) of the feed roll assembly.
[4] Feed roll assembly:
Comprises a feed roll and feed clutch assemblies. When the feed solenoid is actuated, the spring clutch of the feed
clutch assembly becomes fixed, the feed roll assembly rotates by the drive from the drive assembly, the feed roll
delivering sheets of the paper from the cassette.
One full rotation of the feed roll assembly causes the spring clutch to be released, thus disabling the drive of the drive
assembly from being transmitted.
[5] Turn Solenoid:
Controls operations (rotation and stop) of the turn roll assembly (only when it receives PRFD (prefeed) signals from
the main logic board).
[6] Turn Roll Assembly:
When receiving a PRFD (prefeed) signal from the main logic board, the turn solenoid is actuated to cause the spring
clutch of the turn roll assembly to be released, thus stopping transmission of the drive from the drive assembly and
paper transportation, allowing the turn roll assembly to wait in front of the regi. sensor.
The turn solenoid,on receiving a START signal from the main logic board, stops operating to cause the spring clutch
to be fixed, the turn roll assembly rotating by the drive from the drive assembly to deliver sheets of paper.
When receiving no PRFD signal, the turn roll assembly is constantly transmitted the drive from the drive assembly
to deliver sheets of paper.
THEORY OF OPERATION
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