38
Chapter
4
Printing Rates
Printing Rates
Because a line matrix printer prints entire lines sequentially, it is faster than a
moving-printhead printer, which prints single characters sequentially. The
printing speed of text is measured in lines per minute (lpm) rather than
characters per minute (cpm).
Many variables affect printing speed, the main ones being the selected font
and the vertical dot density. Lines containing attributes such as bold or
emphasized print, superscripts, subscripts, or elongated characters also
reduce print speed to never less than half the rates of lines without such
attributes. The actual print rate of lines containing these attributes depends on
the specific print job, but software maximizes the throughput by dynamically
determining which dot rows contain adjacent dots and must be printed in two
strokes. Printing speed is not affected by the number of characters in a
character set.
The printing speed of graphics (“plot mode”) is expressed in inches per
minute (ipm).
The ability of the printer to feed paper downwards as well as upwards allows
the printing of multiple densities on a single line. This is useful for printing
forms and text together or for mixing fonts on the same print line. Use of
multiple densities and reverse paper feed also affects throughput.
Printing Mechanism
While the principles of line matrix printing are easy to state, the act of printing
dots accurately from a rapidly oscillating shuttle onto a piece of paper moving
vertically requires complex timing and coordination between printer logic and
the printing mechanism.
The printing mechanism consists of three integrated subassemblies:
•
Shuttle Frame Assembly
•
Ribbon Transport System
•
Paper Transport System.
Summary of Contents for 6400 Series
Page 2: ......
Page 12: ...Table of Contents...
Page 28: ...28 Chapter 2 Installing And Configuring The IBM 6400 Printer...
Page 34: ...34 Chapter 3 Cleaning The Printer...
Page 184: ...184 Chapter 6 Ethernet Initialization...
Page 267: ...Illustrations Of Printer Components 267 Illustrated parts lists continue on next page...
Page 271: ...Illustrations Of Printer Components 271 Illustrated parts lists continue on next page...
Page 286: ...286 Chapter 7 Section II Illustrated Parts Lists...
Page 299: ...299 Cable Routing Cabinet Model...
Page 301: ...301 Cable Routing Pedestal Model...
Page 305: ...305 Cable Assembly 5V Remote Power 14H5589...
Page 307: ...307 Cable Assembly AC In Power Supply To Power Supply J1 To Circuit Breaker AC Kit 14H5289...
Page 309: ...309 Cable Assembly Card Cage Fan PIN 1 PIN 1 14H5285...
Page 311: ...311 Cable Assembly Exhaust Fan PIN 1 PIN 1 14H5286...
Page 312: ...312 Appendix A Circuit Board And Cable Pinouts Cable Assembly Hammer Bank Logic 14H5279...
Page 313: ...313 Cable Assembly Hammer Bank Power PIN 1 PIN 1 02N6214...
Page 316: ...316 Appendix A Circuit Board And Cable Pinouts Cable Assembly Ribbon Motor Extension 63H7464...
Page 317: ...317 Cable Assembly Shuttle Motor Drive 14H5330...
Page 319: ...319 Logic Cable Power Stacker 24H8976...
Page 320: ...320 Appendix A Circuit Board And Cable Pinouts Power Cable Power Stacker 24H8975...
Page 321: ...321 Vertical Rail Cable Power Stacker Reference only not spared...
Page 323: ...323 Magnetic Pickup MPU Assembly 57G1476...
Page 325: ...325 Switch Assembly Platen Interlock P107 PLO 14H5280...
Page 326: ...326 Appendix A Circuit Board And Cable Pinouts Switch Assembly Cover Open 14H5282...
Page 340: ...340 Appendix D...
Page 354: ...354 Appendix F WR Write w With w o Without XMT Transmit...
Page 403: ...403 Figure 91 Stacker Detail Rollers 75 80 85 90 85 80 From page 401...
Page 420: ...420...
Page 421: ...Preliminary 1...
Page 422: ...Copyright IBM Corp 1995 2000 S246 0117 08 164636 001B 07S246011708 01P4612 0401P4612...