Paper Loading Mechanism - Epson STYLUS PHOTO 925 Service Manual

EPSON Stylus Photo 925

2.1.6 Paper Loading Mechanism

The paper loading mechanism, located in the rear of the printer body, load paper from
the ASF Unit to the PF Roller. This printer employs a stepping motor (ASF/Pump
Motor) dedicated for use with the paper loading mechanism. The driving force from
the ASF/Pump Motor is transmitted to the ASF Unit and the Pump Unit. Table 2-6
below shows the specifications for the ASF/Pump Motor.
Table 2-6.ASF/Pump Motor Specifications
Item
Motor type
Drive voltage 42V (DC voltage) +/-5% (voltage applied to the driver)
Coil Resistance
Inductance
Driving method
Driver IC
The fundamental structure of the paper loading mechanism does not use an ASF HP
sensor but incorporates a single LD roller in the ASF Unit.
The driving force from the ASF/Pump Motor is always transmitted to the ASF Unit.
However, the driving force from the ASF/Pump Motor to be transmitted to the LD
Roller located in the rotating direction of the motor is turned ON/OFF by the Change
Lever and clutch mechanism.
Driving force from the ASF/Pump motor is transmitted to the ASF unit as described
below:
V
Switch the ASF/Pump motor drive to ASF unit side
ASF/Pump Motor pinion gear rotates CCW direction with a specific
steps→Combination Gear 14.4, 38.4 (CW)
→Combination Gear 37.6, 44.4 (CCW)
→Change Lever rotates (CCW)
→Release the Clutch mechanism lock position
Operating Principles
Specifications
4-phase 48-pole PM type stepping motor
Ω °
7.0 +/-10% (per phase at 25 C)
10.0mH+/-20% (1kH 1Vrms)
Bi-Polar drive
LB1946
Figure 2-9 below shows the switching route concerning the driving force from the
ASF/Pump Motor to the ASF Unit.
Figure 2-9. Switch the ASF/Pump Motor Drive to ASF Unit Side
V
Transfer the ASF/Pump motor drive to LD roller
ASF/Pump Motor pinion gear rotates CW direction with a specific
steps→Combination Gear 14.4, 38.4 (CCW)
→Combination Gear 37.6, 44.4 (CW)
→Change Lever rotates (CW)→Spur Gear 23.2 (CCW)
→Spur Gear 35.2 (include the clutch mechanism) (CW)
→LD roller (CW)
Figure 2-10 below shows the transmission path of the driving force from the ASF/
Pump Motor to the LD Roller Unit incorporated in the ASF Unit. The LD roller is
mounted on the same shaft on which the spur gear 35.2 is mounted.
Figure 2-10. ASF/Pump Motor Drive Transmission Path
Overview
Revision A
Change Lever
Combination Gear
Combination Gear
37.6, 44.4
14.4, 38.4
ASF/Pump
Motor Pinion
Change Lever
Spur Gear 35.2
Spur Gear 23.2
Combination
Gear
37.6, 44.4
Combination
Gear
ASF/Pump Motor
14.4, 38.4
Pinion Gear
35