Multi Sheet Inserter (Msi) - Epson ColorPage EPL-C8000 Service Manual

EPSON EPL-C8000

2.5.3 Multi Sheet Inserter (MSI)

1. MSI Assembly
The MSI Assembly feeds paper from the MSI Tray. The MSI
Assembly consists of the MSI Edge Sensor, Pick Up Solenoid, MSI
Clutch and others.
(a) MSI Edge Sensor
The MSI Edge Sensor detects the paper interval (from the
bottom edge of the preceding sheet to the top edge of the next
sheet) in the 2UP mode. If the paper interval is too short, printing
is not done properly in the 2UP mode. If the paper interval
detected by the MSI Edge Sensor is shorter than the
predetermined interval, the system turns off the MSI Clutch. This
causes temporarily cuts the driving force to the Pick Up Rolls so
that the paper transportation timing is adjusted.
(b) Pick Up Solenoid
The MSI Roll Assembly operation (rotation/stop) is controlled by
controlling the rotation of the Pick Up Cam Gear.
(c) MSI Clutch
If the paper interval detected by the MSI Edge Sensor is shorter
than the predetermined interval, the paper transportation timing
needs to be adjusted. If the paper interval is too short, the MSI
Clutch temporarily cuts off the driving force to the Pick Up Rolls
transportation timing. (to adjust the paper interval) and corrects
the paper.
Chapter 2 OPERATING PRINCIPLES
(d) MSI Short N/P Sensor
When the MSI N/P Actuator position changes, the MSI Short N/
P Sensor detects paper on the MSI Assembly. The MSI Short N/
P Sensor only functions when the printer controller sends a
signal indicating short paper size (shorter than 150mm) in the
feeding direction.
(e) MSI Long N/P Sensor
The MSI Long N/P Sensor detects paper on the MSI Assembly
by detecting the light reflected from the paper's surface. The
sensor is horizontally attached to the MSI Tray Assembly. It can
detect light from the light emitter which is reflected on the
paper's surface. (A transparent OHP sheet can be detected by
this method.) The sensor only functions when the printer
controller sends a signal indicating long paper size (150mm or
longer) in the feeding direction.
(g) Retard Pad Assembly
When the Pick Up Roll pulls out a sheet of paper, the friction
between the paper and the Retard Pad Assembly prevents more
than one sheet of paper from being pulled out.
(h) Pick Up Roll
The MSI Roll Assembly receives the force from the Pick Up
Solenoid and the MSI Clutch and starts rotating and the Pick Up
Roll pulls out a sheet of paper. Both the Pick Up Gear and the
Pick Up Cam Gear have a notch that, after rotating once,
disengages the Pick Up Cam Gear and MSI Gear, thus causing
the MSI Roll Assembly to stop rotating. This mechanism
ensures that only one sheet of paper is pulled out.
Rev. B
2-24