Epson DFX-9000
Revision B
Operating Principles
Printer mechanism
72
2.2.5 Automatic Paper Thickness Control (APTC)
mechanism
The Automatic Paper Thickness control (APTC) mechanism includes
the APTC unit, Carrier shaft, and the Guide stay.
The Carrier transports the Printhead, and travels horizontally along the
Carrier Shaft and Guide Stay. Both ends of the Carrier shaft are
eccentric, and they are attached by bearings to the side frame. As the
Carrier unit slides along the Guide stay, a parallelism adjustment and a
printhead gap adjustment are performed. The automatic paper thickness
adjustment is made as follows:
1. The SS Gear on the left side of the eccentric Carrier shaft, engaged
with the gear on the APTC unit, rotates the Carrier shaft to move the
Carrier unit (Printhead) away from the paper contact position.
2. The APTC Home Position (HP) sensor detects that the Carrier unit
reaches the furthest position by checking the phase of the SS Gear.
3. The Carrier unit is then moved back toward the paper by the APTC
motor until the APTC sensor detects a change in the APTC motor
load caused by contact with the paper.
4. The printhead-to-paper gap is set by stopping and locking the APTC
motor when the Carrier unit reaches a set distance away from the
paper as detected by the APTC sensor.
The APTC motor drive system is a unipolar, constant current drive.
Figure 2-14. APTC mechanism
Table 2-3. APTC Motor direction and Carrier movement
Rotational Direction of
APTC Motor
The Carrier movement
direction
Clockwise
Backward: platen-gap wider
Counter-clockwise
Forward: platen-gap narrower
SS Gear
Carrier Unit
Carrier Shaft
Guide Stay
APTC Sensor
APTC Motor
APTC HP Sensor
APTC Unit
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 ...