Description The heart of the system is an interchangeable metal or plastic "daisy wheel" holding an entire character set as raised characters moulded on each "petal". In use a servo motor rotates the daisy wheel to position the required character between the hammer and the ribbon. The solenoid-operated hammer then fires, driving the character type on to the ribbon and paper to print the character on the paper. The daisy wheel and hammer are mounted on a sliding carriage similar to that used by dot matrix printers. Different typefaces and sizes can be used by replacing the daisy wheel. It is possible to use multiple fonts within a document: font changing is facilitated by printer driver software which can position the carriage to the center of the platen and prompt the user to change the wheel before continuing printing. However, printing a document with frequent font changes and thus required frequent wheel changes was still an arduous task. Many daisy wheel machines offer a bold type facility, accomplished by double- or triple-striking the specified character(s); servo-based printers advance the carriage fractionally for a wider (and therefore blacker) character, while cheaper machines perform a carriage return without a line feed to return to the beginning of the line, space through all non-bold text, and restrike each bolded character. The inherent imprecision in attempting to restrike on exactly the same spot after a carriage return provides the same effect as the more expensive servo-based printers, with the unique side effect that as the printer ages and wears, bold text becomes bolder. Like all other impact printers, daisy wheel printers are noisy. Thimble printers Thimble printers were closely related to daisy wheel printers, but instead of a flat wheel the petals were bent to form a cup-shaped "thimble" print element. Introduced by NEC in 1977 as their "Spinwriter" series, the replaceable thimbles each held 128 characters. History In 1972 a team at Diablo Systems led by engineer David S. Lee developed the first commercially successful daisy-wheel printer, a device that was faster and more flexible than IBM's golf-ball devices, being capable of 30 cps (characters per second), whereas IBM's Selectric operated at 10 cps. Xerox acquired Diablo that same year, following which Lee departed to set up Qume Corporation in 1973. Xerox's Office Product Division had already been buying Diablo printers for its Redactron text editors. After 7 years trying to make Diablo profitable, the OPD focused on developing and selling the Diablo 630 which was mostly bought by companies such as Digital Equipment Corporation.[citation needed] The Diablo 630 was capable of producing letter quality output that was as good as that produced by an IBM Selectric or Selectric-based printer, but at a lower cost. A further advantage over the Selectric-based printers, was that it supported the entire ASCII printing character set. Its servo- controlled carriage also permitted the use of proportional spaced fonts, where characters occupy a different amount of horizontal space according to their width. The Diablo 630 was sufficiently successful that virtually all later daisy wheel printers, as well as many dot matrix printers and even the original Apple Laserwriter either copied its command set or could emulate one. Daisy wheel printers from Diablo and Lee's 1973 company Qume were the dominant high-end output technology for computer and office automation applications by 1980, though high speed non-impact techniques were already entering the market (e.g. IBM 6640 inkjet, Xerox 2700 and IBM 6670 laser). From 1981 onwards the IBM PC's introduction of "Code page 437" with 254 printable glyphs (including 40 shapes specifically for drawing forms), and development of Xerox Star-influenced environments such as the Macintosh, GEM and Windows made bit-mapped approaches more desirable, driving cost reductions for laser print ing and higher resolution for impact dot matrix printing. Xerox later adapted Diablo's daisy wheel technology into a typewriter that would sell for less than $50. An automated factory was constructed near Dallas that took less than 30 minutes to assemble a Xerox typewriter. The Xerox typewriter was well received but never achieved the projected sales numbers due to the advent of the PC and word processing software. The typewriter was later modified to be compatible with PCs but the engineering which made it a low cost device reduced its flexibility. By the mid-1980s daisy wheel technology was rapidly becoming obsolete due to the growing spread of affordable laser and inkjet machines, and daisy wheel machines soon disappeared except for the small remaining typewriter market. Graphics Although the daisy wheel principle is basically inappropriate for printing bitmap graphics, there were attempts to enable them to do so. Most daisy wheel printers supported a relatively coarse an d extremely slow graphics mode by printing the image entirely out of full stops (also called periods). This required a mechanism capable of pixel by pixel movement, both horizontally and vertically, and low-end printers were incapable of it. Given the slow speed and the coarse resolution this was not a feasible technique for printing large images, but could usefully print a small logo onto a letterhead and then the following letter, all in a single unattended print run without changing the print element. Consideration was also given to optimising graphic printing by changing the glyphs on the daisy wheel to a set that would be able to print all the required bitmap combinations more quickly, without requiring an impact for every single dot. This would have the advantage that vertical dot combinations could be printed in a single impact, without requiring fine rotation control of the platen roller. However it would require a specialised daisy wheel so printing of a letter and letterhead would require a two-step process with a manual wheel change in-between. As the development of this technique post-dated the widespread availability of 24-pin dot matrix printers and coincided with the arrival of affordable laser printers in offices, it was never a popular approach. See also Diablo 630 Notes ^ Cromenco 3355A Printer Operator's Guide. Cromenco, Inc.. March 1980. /static/S100/cromemco/camera%20disks%20terminal%20printer/Cromemco%203355A%20Printer%20Operators%20Guide%20023-6006%20198003.PDF. (Rebadged Model 550 Series Spinwriter) ^ "NEC Printer Model Information". /products.cfm. Retrieved 18 February 2009. ^ Hirahara, Naomi (2002). Distinguished Asian American Business Leaders. Greenwood Publishing Group. pp. 120. ISBN 1573563447. ^ Strassman, Paul A. (June 5, 2008). The Computers Nobody Wanted; My Years with Xerox. Strassmann, Inc.. pp. 9697. ISBN 1427632707. ^ Hogan, Thom (March 1984). "Creating a letterhead with your daisywheel printer". Creative C omputing Magazine 10 (3): 202. /creative/v10n3/202_Creating_a_letterhead_wit.php. ^ Kostopoulos, G.K. (February 1989). "Quality graphics for daisy-wheel word processing". Consumer Electronics, IEEE Transactions on (IEEE) 35 (1): 1623. doi:10.1109/30.24649. ISSN 0098-3063. /xpls/abs_all.jsp?arnumber=24649. Categories: Computer printers | Impact printers | Office equipmentHidden categories: Articles with unsourced statements from December 2007 | All articles with unsourced statements | Articles with unsourced statements from April 2009
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