Hp 220 User Manual download pdf (Page 42)

5Ć10 Functional Overview

C3187Ć90000

Detecting the Media Edges

 

The plotter detects the left and right media edges using the line sensor located on the

carriage. The sensor is composed of

D Red LED

D Two lenses (caution required when handling)

D Collector plate



 The sensor finds the left media edge when it detects the light from the red LED reflected

off the media surface. The black surface of the drive roller absorbs the light.

Excessive ink deposits on the driveĆroller can fool the sensor by reflecting the light.

 The sensor goes on to find the right media edge.

 The media is advanced and the sensor checks for media skew (crooked loading).

 

The line sensor on the cartridge carriage is also used to

D Detect and measure lines drawn on media when performing cartridge alignment

D Detect and measure lines drawn on media when performing accuracy calibration

D Scan the setup sheet

 

HardĆclip side margins provide protection against writing on the drive roller due to media

expansion/contraction or skew. Top and bottom margins are set according to the physical

spacing between the pinchĆwheels, overdrive and writing head. (Specifications ' chapter 1.)

 

You can use a wide variety of media sizes, due to the

D Continuous roller

D Spacing of the pinchĆwheels and starĆwheels

D EdgeĆdetection capability

(Specifications ' chapter 1.)

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Hp 220 User Manual Page 42