Kodak 800 SERIES service manual Carriage Axis Drive

NovaJet 800 Series Service Manual

The Carriage Axis Drive

TRAILING

CABLE

CONNECTION

FROM

MAIN

PWA

TRAILING

CABLE

CARRIAGE

PWA

INKJET DRIVERS

OPTICAL ENCODER

OPTICAL SENSOR

PAPER SENSOR

RIGHT CARRIAGE

ASSEMBLY ONLY

CARTRIDGE 1

CARTRIDGE 2

CARTRIDGE 3

CARTRIDGE 4

LEFT AND RIGHT CARRIAGE ASSEMBLY

Figure 2-3. Carriage Axis Drive.

The Carriage Axis Drive moves the printer’s carriage assembly along the length of the printer. The drive consists of a servo motor, linear encoder strip, drive belt, and tensioning assembly. These items are illustrated in Figure 2-3.

The servo motor, drive belt, and tensioning assembly are the components that actually drive the carriage assembly. The servo motor drives the belt back and forth allowing the attached carriage assemblies to be reposi- tioned as required. The tensioning assembly is spring controlled and allows the proper amount of tension on the belt.

The linear optical encoder strip is used to obtain the printers accuracy along the axis of the printer. The strip of film has 150 parallel lines per inch printed on it. By utilizing two optical encoder sensors that are slightly off set from each other, and reading the leading and trailing edges of the lines, a resolution of 600 dpi can be obtained.

The stepper and servo motors are controlled from the main printed circuit assembly by the microprocessor.

Theory of Operation 2-5