Epson MX-82 F/T User Manual - Page 59
Fig. 60 Dot Wires, Fig. 61 Formation of Character E, Dot Matrix Printer
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The dot matrix printing method allows a printer to easily form any desired character, It has a print head that contains 9 needles vertically and can create distinctive characters like with typewriter. In that sense it is one of the key features that the printer has. EPSON's MX-82 can control each needle programmably, expanding the ability of the printer. See next how the print head works and forms a character. (1) Dot Matrix Printer The print head contains 9 "needles" or "wires" vertically. Each dot wire is driven by an electromagnet which fires when told to do so by the electronics inside the printer. Signals from the computer cause the appropriate dot wires to be fired from the holder and to impact carbon, causing the character to be printed as a series of dots. Head guide I '2s= .cs- Dot wire Head movement - direction Dot Wire #l- 0.0.. -0 3 ;.*. Dot Wire #7 z :.... Head movement direction Fig. 60 Dot Wires Fig. 61 Formation of Character "E" As an example (See Fig. 61) , to print the letter "E", dot wires 1 through 7 are fired first. They hit the ribbon. That makes marks on the paper. Then the head shifts over a bit and dot wires 1, 4 and 7 are fired. In this manner, the character "E" is formed. -53-