Kodak 630, 500, 700 service manual Paper Media Axis Drive

NovaJet 500/630/700 Series Service Manual

Paper (Media) Axis Drive

PINCH ROLLERS

STEPPER MOTOR

LOWER ROLLER SHAFT ASSY

REDUCTION GEAR

Figure 2-2. Paper (Media) Axis Drive.

THEORY OF OPERATION

The Paper (Media) Axis Drive moves the plotting media in a direction perpendicular to the length of the printer. This friction drive utilizes a micro-step drive technology and consists of a stepper motor, reduction gears, lower drive shaft assembly, and pinch rollers. This can be seen in Figure 2-2.

The micro-step technology associated with the stepper motor gives the capability of a resolution up to 9600 dpi.

The reduction gear meshes the stepper motor to the lower drive shaft assembly which allows the media to advance or retract. The purpose of the pinch rollers is to apply pressure to the media onto the drive shaft assembly to reduce the chance of slipping.

Misaligned pinch wheels is a main cause of skewing of the media. For that reason the NovaJet 500/630/700 Series was designed with self aligning pinch rollers. As the media is fed forward, the rollers are aligned correctly. However, these pinch rollers will not stay aligned while the media is being fed backwards.

Theory of Operation 2-3