Page 57 - FUNDAMENTALS OF COMPUTER

NPP Computer Basics and Windows Fundamentals 57

1.27 Chain Printer 1.27 M¡Z {à¨Q>a
Chain Printer is a line printer. Its function M¡Z {à¨Q>a EH$ bmB©Z {àÝQ>a hmoVm h¡ Ÿ& BgH$m H$m`©
is similar to drum printer but a steel band is S´>_ {à¨Q>a Ho$ g_mZ hr hmoVm h¡ Ÿ& bo{H$Z EH$ ñQ>rb H$s
used instead of a drum. The characters are MoZ na Ho$aoŠQ>a C^ao hþE hmoVo h¢Ÿ& EH$ g§nyU© bmB©Z Ho$
embosed on the band. The characters in a com-
plete line are sent to the printer buffer register. Ho$aoŠQ>am| Ho$ H$moS> {à¨Q>a H$mo ^oOo OmVo h¢Ÿ& {à¨Q>a ~\$a
The hammer corresponding to a desired char- a{OñQ>a BÝh| AnZo _| aIVm h¡Ÿ& {à¨Q>a n[anW go àmá
acter is activated and it strikes on the paper. {g¾b Ho$ AZwgma Amdí`H$ ho_a CÎmo{OV hmoVm h¡ Am¡a
The number of hammers are equal to the num- nona go Q>H$amVm h¡Ÿ& nona Ho$ ZrMo [a~Z hmoVm h¡Ÿ& AV…
ber of characters in a single line. For example Aja nona na C^a AmVm h¡Ÿ& EH$ bmB©Z _| {OVZo Ho$aoŠQ>a
132 character line would need 132 hammers. hmoVo h¢ CVZo hr ho_a hmoVo h¢Ÿ& MoZ H$m MbZm d ho_a H$m
The hammer movement and chain movement Q>H$amZm {à¨Q>a n[anW Ûmam {Z`§{ÌV {H$`m Om gH$Vm h¡Ÿ&
is accurately synchronised by printer electron-
ics. The advantage of chain printer is that the Bg àH$ma Ho$ {à¨Q>am| H$m bm^ `h hmoVm h¡ {H$ MoZ H$mo
chain can be easily changed. Therefore differ- AmgmZr go ~Xbm Om gH$Vm h¡ Am¡a AbJ-AbJ àH$ma
ent fonts and scripts can be printed. Ho$ \$m|Q> àmá {H$E Om gH$Vo h¢Ÿ&
1.28 Plotters NPP 1.28 ßbm°Q>a
These devices are used to produce good AÀN>r JwUdÎmm H$s S´>mBªJ d J«m\$ ~ZmZo Ho$ {bE
quality drawing and graphics. The difference ßbm°Q>a H$m Cn`moJ hmoVm h¡Ÿ& {à¨Q>a S>m°Q> H$s ghm`Vm go
between plotters and printer is that every printer {à¨Q> H$aVm h¡ Ÿ& na§Vw àË`oH$ ßbm°Q>a _| EH$ noZ hmoVm h¡
uses dots to produce the contents. But every
plotter has a pen with the help of which it can {OgH$s ghm¶Vm go ¶h J«m{’$³g ¶m S´>mB§½g ~Zm gH$Vm
draw graphics or drawings. There are two types h¡& Xmo àH$ma Ho$ ßbm°Q>a Cn`moJ _| bmE OmVo h¢…
of plotters in used:
1. Drum Plotter 1. S´>_ ßbm°Q>a
2. Flat bed Plotter 2. âboQ>-~oS> ßbm°Q>a
Drum Plotter S´>_ ßbm°Q>a
This plotter has a drum which can rotate. O¡gm {H$ Zm_ go hr ñnï> h¡ {H$ Bg_| EH$ Ky_Zo dmbm
The paper on which the graph is to be plotted, S´>_ hmoVm h¡ Ÿ& {Og erQ> na J«m\$ ~ZmZm h¡, Cgo S´>_ na
is placed on the surface of the drum. A pen is
mounted on the carriage. This can move left to bnoQ> XoVo h¢& S´>_ XmoZm| {XemAm| _| Ky_ gH$Vm h¡ Ÿ& noZ S´>_
right or right to left, that is perpendicular to the Ho$ Ky_Zo H$s {Xem Ho$ bå~dV J{V H$aVm h¡ Ÿ& noO H$m
direction of drum rotation. Drum can rotate in MbZm d S´>_ H$m Ky_Zm EH$ àmoJ«m_ Ûmam {Z`§{ÌV hmoVm h¡,
both the directions. The movement of a pen {Ogo J«m\$ ßbm°qQ>J àmoJ«m_ H$hVo h¢& EH$ S´>_ na EH$ go
and rotation of drum is under control of the
graph plotting program. Multiple colour draw- Á`mXm noZ ^r hmo gH$Vo h¡ Ÿ& Bggo AZoH$ H$bg© dmbr
ing can also be made by using multiple pens. S´>mBªJ ~ZmB© Om gH$Vr h¡ Ÿ& noO H$m M`Z àmoJ«m_ Ûmam
Each pen has a different colour ink. The pro- {H$`m Om gH$Vm h¡Ÿ&
gram can select a particular pen.