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Printer Supplies & Accessories

Print Heads

Print Heads Article

Line printers, as the name implies, print an entire line of text at a time. Three principal designs existed. In drum printers, a drum carries the entire character set of the printer repeated in each column that is to be printed. In chain printers (also known as train printers), the character set is arranged multiple times around a chain that travels horizontally past the print line. In either case, to print a line, precisely timed hammers strike against the back of the paper at the exact moment that the correct character to be printed is passing in front of the paper. The paper presses forward against a ribbon which then presses against the character form and the impression of the character form is printed onto the paper.

Comb printers represent the third major design. These printers were a hybrid of dot matrix printing and line printing. In these printers, a comb of hammers printed a portion of a row of pixels at one time (for example, every eighth pixel). By shifting the comb back and forth slightly, the entire pixel row could be printed (continuing the example, in just eight cycles). The paper then advanced and the next pixel row was printed. Because far less motion was involved than in a conventional dot matrix printer, these printers were very fast compared to dot matrix printers and were competitive in speed with formed-character line printers while also being able to print dot-matrix graphics.

Line printers were the fastest of all impact printers and were used for bulk printing in large computer centres. They were virtually never used with personal computers and have now been replaced by high-speed laser printers.

The legacy of line printers lives on in many computer operating systems, which use the abbreviations "lp", "lpr", or "LPT" to refer to printers. The dot matrix is really slow and it is only for office printers

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ZEBRA Z4000/Z4M/Z4M+ ( 300DPI PRINTHEAD )
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HP 14 Print Head : OfficeJet 7130 7100 D145 D135 D125
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Hewlett Packard 10 (C4801A) Printhead Cyan (3)
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HP 45 Print Cartridge
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HP 14 Print Head : OfficeJet 7130 7110 D155 D135 D125
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NEW HP C9381A Black Yellow 88 Printhead Genuine
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REFURBISH YOUR CANON PRINTHEAD i950 / i960 SAVE HALF!!!
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HP Genuine OEM c4810a Printhead 11
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Canon PrintHead QY6-0059 for CanonI P4200 & MP500 print
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HP 14 Print Head : OfficeJet 7130 7110 D155 D135 D125
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HP 14 Black Printhead - c4920a - D135, D145, 7110, 7130
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Hewlett Packard HP 88 Cyan Magenta Printhead - C9381A
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HP 81Black Dye Printhead Cleaner C4950A Sealed NR
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HP 14 Color Printhead OfficeJet 7110 D155 D135 D125 610
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HP 14 Printhead : OfficeJet 7130 D155 D145 Printer Refb
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New Genuine OEM HP 10 Magenta Printhead C4802A
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Canon PrintHead Mod QY6-0054 - Known as QY6-0047
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HP 14 Print Head : OfficeJet 7130 7110 D155 D135 D125
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HP 11 Printhead Black NIB Free Shipping
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4230 Printhead IBM PN# 1053073 Refurbished
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HP 23 Color Ink Jet Cartridge Twin Pack
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HP Designjet 5000 NIB 81 Light Cyan Printhead C4954A
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HP #81 DYE C4930A,31A, 32A PRINTHEAD & CLEANER LOT/ 3
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NEW HP #88 Magenta/Cyan Printhead C9382A GENUINE!
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HP 81 Light Magenta Printhead Cleaner C4955A Sealed NR
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2009/8 SET 4 HP #88 PRINTHEAD OFFICEJET PRO K550 C9831A
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3 NEW HP print heads C4800A black, C4801A , and C4802A
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Canon PrintHead QY6-0063 for Canon iP6600PD Printer
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HP 14 Print Head : OfficeJet 7130 7110 D155 D135 D125
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Canon PrintHead QY6-0075 Same QY6-0067 For MP610 MP810
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SURPLUS DNE TECHNOLOGIES DH-90 AUTOMATIC PRINT HEAD
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New HP Magenta 10 Ink Jet Printer Printhead (C4802A) NR
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HP 14 Printhead : OfficeJet 7130 D135 D125 Printer Refb
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DELL NG873 PRINTHEAD ASSEMBLY FOR 3000/3000CN PRINTER!!
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Canon PrintHead Mod QY6-0070 For PIXMA MP510 and iP3300
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HP 10 11 C4844 C4838 C4837 C4836 NIB Ink Cartridges (8)
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HP 14 Print Head : OfficeJet 7130 7110 D155 D135 D125
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