Paper Loading Mechanism (Asf Unit) - Epson Stylus PHOTO 950 Service Manual

EPSON Stylus PHOTO 950

2.2.4 Paper Loading Mechanism (ASF Unit)

The Paper loading mechanism is positioned at the printer rear. The Paper loading
mechanism loads paper at the ASF unit and feeds paper to the PF roller.
ASF Support Guide
Figure 2-9. ASF Support Guide
Purpose
1. When the specification 150 sheets of plain paper have been set, the customer can
generally check whether 150 pages are loaded from the thickness of the ASF
marking. However, it can be assumed that some customers might try to force more
than 150 sheets in. The ASF guide is shaped like a key so that no more than 150
sheets can be placed into it so as to prevent paper feeding problems. The result is
that this key shape encourages the customer to remove the excess number of sheets
and to place them back into the hopper.
2. Another purpose of the ASF support guide is that when the paper back lever snaps
back into place during paper feeding, the paper back lever also brings the key-
shaped ASF support guide back to prevent multiple sheets of paper from being fed
at once, thus improving the reliability of paper feeding.
OPERATING PRINCIPLES
Paper Back
Transmission Lever
Printer Mechanism
CLUTCH MECHANISM
The Clutch mechanism is located at the rear of the printer inside the left part of the
ASF unit.
Unlike the previous products, this product dose not have a ASF HP sensor.
Instead of the ASF HP sensor, Change lever and the Clutch mechanism are used to
detect the ASF home position. Following figures describe the mechanism.
Paper feeding
1. When the print data is sent to the printer, paper feeding starts.
2. The Carriage unit moves to the left side of the printer and contacts the Change
lever, causing the hook of the Change lever to disengage from the projection on
the Clutch.
The projection
on the clutch
Change lever
Figure 2-10. Paper feeding (1)
Revision A
The hook of
the change lever
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