EPSON Stylus COLOR 860/1160
Revision C
Operating Principles
Overview
33
2.1.1.4 Platen Gap (PG) Adjust Mechanism
The PG adjustment, at the left of the printer mechanism, consists of the PG
lever, PF support lever, right/left parallelism adjustment levers, and CR guide
shaft. The PG adjustment mechanism is designed to keep the platen gap
correct for the paper thickness to prevent ink from smearing. The PG lever
joins the CR guide shaft, which has an eccentricity via PG sub lever. Switching
the lever from “0” to “+” rotates the CR shaft and changes the platen gap from
narrow to wide.
Table 2-3.
Platen Gap Adjust Lever Setting
2.1.1.5 Paper Feeding Mechanism
The paper feeding mechanism transports paper loaded from ASF using the PF
rollers and paper eject rollers. A new type of DC motor is used for the PF
motor. See the table below for the DC motor specifications.
Table 2-4.
PF Motor Specifications
Unlike a stepping motor, the DC motor that drives the paper feeding
mechanism can not measure the paper feeding amount by referring to the
pulses given. For this reason, the loop scale and encoder sensor are directly
attached to the left end of the PF roller shaft to mechanically control paper feed
amount. See Section 2.2 for detailed information on the PF motor control
circuit.
Drive from the PF motor is sent to the PF rollers and paper eject rollers as
described below.
o
To the PF rollers:
PF motor pinion gear
→
Spur gear (76)
→
PF rollers
o
To the eject rollers:
PF motor pinion gear
→
Spur gear (76)
→
Combination gear (13.5, 308)
→
Spur gear (28)
→
Paper eject rollers
Figure 2-6 in the next page gives the paper feeding mechanism block diagram,
showing the parts along the PF motor drive transmission paths.
Paper
Lever Position
PG adjustment value
All Media
Front
0 mm
(1.14 mm between head and platen)
If you find any print
problems or use thick
paper.
Rear
0.7mm
(1.84 mm between head and platen)
Item
Description
Motor type
DC Motor with Brush
Drive voltage
+42V +/- 5% (DRV IC voltage)
Coil Resistance
31.1 ohm +/- 25%
Drive frequency [Hz]
26.6mH +/- 25%
Control method
A3958
Summary of Contents for Stylus COLOR 1160
Page 8: ...C H A P T E R PRODUCTDESCRIPTION ...
Page 28: ...C H A P T E R OPERATINGPRINCIPLES ...
Page 53: ...C H A P T E R TROUBLESHOOTING ...
Page 74: ...C H A P T E R DISASSEMBLYANDASSEMBLY ...
Page 116: ...C H A P T E R ADJUSTMENT ...
Page 150: ...C H A P T E R MAINTENANCE ...
Page 160: ...APPENDIX C H A P T E R ...