Printers

Device that prints text and graphics in the same format and shape which is displayed on the screen connected via printer cable or USB cable.
Transforms digitally stored documents, graphics, text data on paper/hard copy.
Speed of printer is measured in printed pages per minute.
Printers can be shared in the LAN, Wireless networks or Ethernets.
New types of printers are combined with printing, scanning and fax in a single unit.

Inkjet Printers:

Sprays small droplets of ink at high speed on the surface.
They are reliable, quick, and inexpensive.

1) Continuous Flow:

Produces continues flow of stream droplets by spraying ink out of the nozzle.
Stream of ink is broken down into droplets of ink using ultrasonic waves.
When ink is desired on the medium, only selected droplets are electro statically charged.
Deflection plates are used to direct the ink onto the medium.
Remaining ink which is not required is sent back to reservoir through gutter.

2) Drop on demand:

Laser Printers:

Uses laser beam to produce images with excellent text and graphics.
Used in high quality outputs.

Working:

Consists of drum which is coated with a photo conductive material.
As drum rotates the coating on drum gets electrically charged.
Drum remains charged until it is struck by laser light.
When laser light falls on drum it selectively discharges some area of the drum.
This forms a negative image on the drum.
Position of laser light is maintained by rotating polygonal mirror.
Toner is a black plastic base ink powder.
This powder gets attracted to the charged areas on the drum.
Image on the drum is transferred to oppositely precharged paper.
Toner is fused to the paper by hearing and applying pressure to form a permanent image.

Tip Box

Add and connect a printer in a network

Adding printer

Connecting printer