Paper Loading Mechanism - Epson Stylus COLOR 880 Service Manual

EPSON Stylus COLOR 880

2.1.1.7 Paper Loading Mechanism

The paper loading mechanism loads paper at the ASF unit and feeds paper to
the PF rollers. The ASF unit, the same as in the Stylus COLOR 440/640/740,
uses a 4-phase 48-pole PM type stepping motor for the ASF/Pump motor.
Drive sent from this motor is switched between the ASF unit side and pump
unit by the disengage mechanism. See Figure 2-6 for the ASF/Pump motor
specifications.
Table 2-6. ASF/Pump Motor Specifications
Items
Motor type
Drive method
Drive voltage
Coil Resistance
Drive frequency [Hz]
Control method
The rotational directions and their functions are shown in the table below:
Table 2-7. ASF/Pump Motor Rotation
Directions
Clockwise
Counterclockwise
Operating Principles
Description
4 Phase/ 48-pole /PM type pulse motor
Bipolar drive
+42V +/- 5% (DRV IC voltage)
10.4 ohm +/- 10%
15mH
A3958
Corresponding Functions
• Sets the paper return lever.
• Switches torque to the ASF side.
• Loads paper at ASF.
Torque from the ASF/Pump motor is transmitted to the ASF as described
below:
Torque transmission to the ASF unit
1) W hen the C R unit m oves to the right end of the C R shaft, the D E lock lever
is pushed to the right end.
2) The A S F-P um p m otor rotates clockw ise specified steps (view ed from the
m otor pinion gear side).
3) W ith the rotation of step 2), the planetary gear set in the disengage unit
shifts to the com bination gear (12, 22.4) side.
4) The C R unit m oves specified steps from the right end of the C R shaft to the
left. W ith this m ovem ent, the D E lock lever fixes the planetary gear unit.
5) Torque from the AS F/P um p m otor is transm itted as described below .
Motor pinion gear
→
22.4) Combination gear (14, 28)
Figure 2-9 shows the disengage mechanism and the parts involved.
Figure 2-9. Disengage Mechanism
Overview
→ →
Planetary gear (15.2) Combination gear (12,
→
Spur gear (32) in ASF
Revision A
38