Epson 9600, 7600 Platen GAP Adjustment Unit, Carriage Mechanical Unit and PG Adjustment Unit

EPSON Stylus Pro 7600/9600 Revision A

Table 2-3. Printing Modes (Drive Waveforms)

Ink Type	Waveform	Ink Discharged	Drive Frequency	Print Resolution	CR Speed
	Name	(ng)
	VSD1-Dye	13.8-27.6-41.5	8.64 KHz	H360 x V360	240 CPS
				H720 x V360
Dye ink	VSD2-Dye	5.4-9.5-23.0	8.64 KHz	H720 x V720	240 CPS
				H1440 x V720
	VSD4-Dye	2.5	2 shots at 6.84 KHz	H2880 x V1440	190 CPS

PLATEN GAP ADJUSTMENT UNIT

In order to maintain the print precision, it is necessary to maintain the carriage (= head) mounting position so that it is always a constant distance from the surface of the paper.

In this printer, the print head nozzle surfaces and platen surface are variable mechanisms so that the gap between the paper printing surface and the head nozzle surface can be kept constant.

The carriage has a 2-body construction with a sub-carriage on which the print heads are mounted attached to the carriage which forms the base. The sub-carriage moves in the vertical direction with respect to the paper surface. This movable system uses a cam.

The sub-carriage to paper surface distance changes linearly from the cam (= PG) home position. When the carriage is in the HP position (= right end), the pump motor and the gear mounted on the cam shaft engage, the motor's rotation (reverse) drives the cam and the sub-carriage is positioned at the proper gap position.

In order to maintain the distance between the print head nozzle surface and the paper properly, the thicknesses of the paper used are classified into 3 levels for PG setting, namely, PG small (1.3 mm), PG medium (2.2 mm) and PG large (2.7 mm).

The sensors used in the platen gap adjustment unit are explained below.

CR Guide Rail

Bearing

Carriage

PG (Head SLID)

HD_SLID

Sensor

HP Detection Flag

Right Side of Carriage

Bearing

Sub-carriage (head mounted)

Slide Gear

Pump motor driving force (CCW)

Right Side of Printer Mechanism

Figure 2-4. Carriage Mechanical Unit and PG Adjustment Unit

Operating Principles Print Mechanism Components 106