HP LQH-HW 3ULQWHUV User Manual download pdf (Page 27)

Printing Speed

After a line of characters is printed, the paper advances to the first dot row of

the next print line. This creates a number of blank rows between lines of

characters, depending on the print mode and line spacing you selected.

Figure 3. Dot Matrix Line Printing

Printing Speed

The speed at which text prints is measured in lines per minute (lpm). This

speed is directly proportional to the number of dot rows required to produce a

character line, regardless of the number of characters in the line. More dot

rows are required to print lowercase characters with descenders;

consequently, those character lines print at a fractionally lower rate.

The printer also prints dot-addressable graphic images. The speed at which

graphics are plotted is measured in inches per minute (ipm). Unidirectional

plotting produces slightly better print quality and takes about twice as long as

bidirectional plotting. You can select either plotting mode from the control

panel.

Printing and plotting rates also vary according to the print mode you select.

Print mode refers to the way you instruct the printer to create characters. If,

for example, you select standard quality (data processing) mode, the printer

uses more dot rows to form characters than if you choose Sparse (high

speed) mode. Character formation and print speed are faster in Sparse mode,

because the printer prints fewer dot rows to form characters. Vertical dot

density is a factor in printing speed.

Nominal printing rates are charted in Appendix A.

Dot

Row Start

Paper

Feed

Number of rows is determined by line spacing.

This row is used only for lowercase descenders.

This row is used for underlining and lowercase descenders.

One

Text

Line

Direction of Shuttle Movement

Direction

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 303 304

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HP LQH-HW 3ULQWHUV User Manual Page 27