Epson DFX-9000
Revision B
Operating Principles
Printer mechanism
58
2.2 Printer mechanism
The operating principles of the printer mechanism are described below,
and includes the following sections:
2.2.1 Printhead (p.58)
2.2.2 Carrier drive mechanism (p.61)
2.2.3 Ribbon drive mechanism (p.63)
2.2.4 Paper feed mechanism (p.64)
2.2.4.1 Tractor mechanism (p.64)
2.2.4.4 Paper path switching mechanism (p.69)
2.2.4.5 Paper eject mechanism (p.70)
2.2.5 Automatic Paper Thickness Control (APTC) mechanism (p.72)
2.2.6 Other mechanisms (p.75)
2.2.6.1 Top cover open/close detection mechanism (p.75)
2.2.6.2 Cooling fans (p.76)
2.2.1 Printhead
The printhead contains 36 coils that drive armatures to which the print
wires are attached.
When not firing, the armatures are pushed back to the stopper by coil
springs. When the coil is energized, the armatures, attracted by the
magnetic field, move the print wires in the direction of the red arrow
below in Figure 2-2. The print wires, guided by the wire guides through
the front of the printhead, strike the ribbon and then the print media
behind the ribbon. When the coil current is switched off, the armatures
are pushed back to the stopper again by the coil springs and enter the
print-waiting state.
Figure 2-2. The Print Head Structure
Wires
Wire Guides
Armatures
Coils
Guides
Coil Springs
Pri
n
t Sid
e
Stoppers
Summary of Contents for DFX-9000
Page 1: ...EPSONDFX 9000 Serial Impact Dot Matrix Printer SEDM04003 SERVICE MANUAL ...
Page 8: ...C H A P T E R 1 PRODUCT DESCRIPTION ...
Page 61: ...Epson DFX 9000 Revision B Product Description Dimensions and weight 54 ...
Page 62: ...C H A P T E R 2 OPERATING PRINCIPLES ...
Page 99: ...Epson DFX 9000 Revision B Operating Principles Circuit operation 92 ...
Page 100: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 104: ...Epson DFX 9000 Revision B Troubleshooting Overview 97 Mechanism initialization e e e e e ...
Page 107: ...Epson DFX 9000 Revision B Troubleshooting Overview 100 PAPER FEEDING FF APG APPROACH ...
Page 130: ...C H A P T E R 4 DISASSEMBLY AND ASSEMBLY ...
Page 218: ...C H A P T E R 5 ADJUSTMENT ...
Page 263: ...Epson DFX 9000 Revision B Adjustment Additional functions 256 ...
Page 264: ...C H A P T E R 6 MAINTENANCE ...
Page 286: ...C H A P T E R 7 APPENDIX ...
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Page 324: ...EPSON DFX 9000 Revision B Appendix Component Layout 317 7 4 Component Layout ...
Page 333: ...EPSON DFX 9000 Revision B Appendix Parts list 326 ...