Kodak 500, 630, 700 service manual Carriage Axis Drive

NovaJet 500/630/700 Series Service Manual

The Carriage Axis Drive

ENCODER STRIP

BELT

TENSIONINGSERVO

ASSYMOTOR

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 compo- nents that actually drive the carriage assembly. The servo motor drives the belt back and forth allowing the attached carriage assembly to be repositioned 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. It is made with 150 parallel lines per inch etched into it. By utilizing two optical encoder sensors that are slightly offset 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 wiring assembly (MPWA) by the microprocessor.

2-4 Theory of Operation