Epson 9600 Service Manual - Page 104
Operating Principles, Print Mechanism Components
UPC - 010343841888
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EPSON Stylus Pro 7600/9600 CARRIAGE MOVING UNIT In place of the carriage holding system in which 2 CR guide shafts extending in the column direction were used, as in the conventional models, a structure with the carriage mounted via multiple rollers (bearings) on a CR guide rail made of a square extruded aluminum pipe is used. Steel rails are incorporated in the roller contact and running surface, and the result is a reduction in friction in the direction of movement, reduced vibration and improved durability. C A U T IO N The screws used to fasten the CR guide rail should not be taken out and the carriage should not be removed. These are adjusted and assembled to the nearest 1/100 mm at the factory. CR motor A DC motor is used for the CR motor and the slit in the timing fence affixed on the bottom of and parallel with the CR guide rail is read by the encoder sensor mounted on the carriage (linear encoder system), and this signal is compared to logical control values in the control circuit on the MAIN board, which carries out feedback speed control. Through this control, high print precision is maintained. Drive transmissions from the CR motor to the carriage use the easy-to-maintain, durable timing belt. The sensors used in the carriage moving unit are described below. CR_HP Sensor (Carriage Home Position) This is a transmissive photosensor which is mounted on the right end of the printer mechanism and detects the entry position of the flag (projection) provided on the carriage as the carriage moving home position. Outputs from this sensor are "OFF" in the HP range and "ON" outside the HP range. CR encoder sensor (Linear Encoder) This encoder is mounted on the back of the carriage and outputs pulses (2 channels) corresponding to the position of the slit on the timing fence that is incorporated into the CR guide rail which are used for CR motor servo control and PTS (Print Timing Signal) generation. The resolution is 1/180 inch. Revision A CR_HP Sensor (Mounted on the mechanism's right end.) Encoder Sensor (On Carriage) Projection on Carriage Outside HP range Inside HP Range Step Ruler (Slit Plate) CR Timing Belt Encoder Sensor Carriage HP Flag CR Motor CR_HP Sensor Figure 2-2. Carriage Mechanism Unit, Carriage Moving Unit Operating Principles Print Mechanism Components 104