Page 52 - FUNDAMENTALS OF COMPUTER

52 Fundamentals of Computers NPP

from computer memory and are placed in Ho$aoŠQ>a H$aHo$ H$moS> {bE OmVo h¢ Ÿ& S>m°Q> _¡{Q´>Šg VWm
printer buffer. One character at a time is taken B§H$OoQ> {à¨Q>a gr[a`b {à¨Q>a ŸhmoVo h¢§Ÿ& qàQ>a _| EH$ {S>H$moS>a
from the buffer. This character code is decoded
by printer circuit to get the actual character hmoVm h¡ Omo H$moS> H$mo {S>H$moS> H$aHo$ Amdí`H$ {g½Zc
printed. Dot-Matrix Printer and inkjet printer CËnÝZ H$aVm h¡Ÿ&
are serial printers.
Line Printer bmB©Z {à¨Q>a
When one line of the text is printed at a `o EH$ ~ma _| EH$ bmB©Z {à¨Q> H$aVo h¢ Ÿ& BZH$s J{V
time, the printer used is called line printer. The bmB©Z à{V {_ZQ> _| _mnr OmVr h¡ & 300 go 3000
printing speed is specified as lines per minute.
It vary from 300 to 3000 lines per minute. Each bmB©Ýg à{V {_ZQ> {à¨Q> H$a gH$Vo h¢ Ÿ& 15 B§M H$s EH$
line may have 96 to 160 characters on 15 inch cmB©Z _| 96 go 160 Ho$aoŠQ>a VH$ hmoVo h¢Ÿ& `o qàQ>a g^r
line. These printers are available in almost all {b{n`m| _| CnbãY hmoVo h¢ Ÿ& gm_mÝ`V: VrZ àH$ma Ho$
scripts. The following types of line printers are bmB©Z qàQ>g© H$m Cn`moJ {H$`m OmVm h¡ …
in use:
 Drum printer  S´>_ {à¨Q>a
 Chain printer NPP  M¡Z {à¨Q>a
 Band printer  ~|S> {à¨Q>a
Page Printer noO {à¨Q>a
These printers print one page at a time. `o qàQ>a EH$ ~ma _| EH$ noO {à¨Q> H$aVo h¢Ÿ& `o gm_mÝ`V:
These are generally non-impact type. Their Zm°Z-BånoŠQ> hmoVo h¢Ÿ& BZH$s J{V noO à{V {_ZQ> go Xem©B©
speed may be specified as pages per minute.
For example, Laser printer is a page printer. OmVr h¡Ÿ& CXmhaU Ho$ {bE, boOa {à¨Q>a EH$ noO {à¨Q>a h¢&
1.23 Dot Matrix Printer 1.23 S>m°Q> _o{Q´>Šg {àÝQ>a

This printer uses a head containing 7 to 24 Bg_| EH$ hoS> hmoVm h¡ {OgHo$ A§Xa 7 go boH$a 24
pins. Each pin works as an electromagnet. Thus, {nÝg hmo gH$Vr h¡ Ÿ& àË`oH$ {nZ {dÚwV-Mw§~H$ H$m H$m`© H$aVr