PRINTERS

Outline

Introduction

Connecting Printer to a PC

Important factors to consider

Printer Classification

Commonly Used Printers and Technologies

Future Technologies

Summary

Introduction

• Printer is an output device attached to your computer that produces printed copies on paper (hard copies).

Connecting printer to a PC

•Printer Can be connected through parallel port which is on the back of CPU.•Now a days printers can be connected by the USB which is more compact and reliable.•Network interface allows several computers to share one printer. There are also Wi-Fi printers that are available through a wireless network

Important factors to consider

Colour

Resolution

Speed

Memory

Price

Cost of Maintenance

Printer Classification

Printers

Impact Non Impact

Impact Printer

• Impact Printers use a print head containing a number of metal pins which strike an inked ribbon placed between the print head and the paper.

• Dot-matrix printers, Daisy wheel printers, etc.

Non Impact Printer

• Non-impact printers are much quieter than impact printers as their printing heads do not strike the paper.

• Several different technologies have been used to provide a variety of printers.

• Laser printers, Bubble-jet printers etc.

Dot Matrix Printer

• Commonly used for printing invoices, purchase orders, labels etc.

• As the printer head moves in horizontal direction

• The printhead controller sends electrical signals • Forces the appropriate wires to strike against

the inked ribbon, making dots on the paper and forming the desired characters.

Serial dot matrix printer Features: Specifications

Print Technology: Serial impact dot matrix

Print SpeedCPS (characters per second) 200 - 1120 CPS (draft)

Graphics Resolution 72 - 360 DPI

Copies (Original +) 4 - 9

Printhead life 200 - 400 million characters

Workload (Duty cycle)PPM (Pages per month) 6,000 - 60,000 PPM

Price [US$] 50 - 3,500 $

Cost Per Page (Cost/cents ¢) 0.15 - 0.2 ¢

Advantages and Disadvantages

Advantages• Can print on multi-part stationery or

make carbon-copies.• One of the lowest printing costs per

page.• They are able to use continuous paper

rather than requiring individual sheets, making them useful for data logging.

• They are good, reliable workhorses ideal for use in situations where printed content is more important than quality.

• The ink ribbon also does not easily dry out,.

Disadvantages• Impact printers are usually noisy• They can only print low resolution

graphics, with limited color performance, limited quality and comparatively low speed.

Daisy Wheel Printers

• A daisy-wheel printer works on the same principle as a ball-head typewriter.

• The daisy wheel is a disk made of plastic or metal on which characters stand out in relief along the outer edge.

• To print a character, the printer rotates the disk until the desired letter is facing the paper.

• Then a hammer strikes the disk, forcing the character to hit an ink ribbon.

• Change the daisy wheel to print different fonts.

INKJET printers and BUBBLEJET printers

• The inkjet printer technology was originally invented by Canon

• Today's printer heads are made up of several nozzles (up to 256), equivalent to several syringes, which are heated up to between 300 and 400°C several times per second.

• Each nozzle produces a tiny bubble that ejects an extremely fine droplet.

• The vacuum caused by the decrease in pressure creates a new bubble.

Generally, we make a distinction between the two different technologies:

• Inkjet printers

• use nozzles that have their own built-in heating element. Thermal technology is used here.

• Bubble jet printers

• use nozzles that have piezoelectric technology. Each nozzle works with a piezoelectric crystal that changes shape when excited by its resonance frequency and ejects an ink bubble.

Printer Features: Specifications

Print Technology: Inkjet or Bubble-jet

Print SpeedPPM (pages per minute) 1 - 20 PPM

Graphics Resolution 300 - 1200 DPI

Copies (Original +) 0

Workload (Duty cycle)PPM (Pages per month) 6,000 - 60,000 PPM

Price [US$]30 - 3,000 $

For large-format printersup to 19,000 $

Cost Per Page (Cost/cents ¢) 3.0 - 30.0 ¢

Laser printer

• The laser printer produce quality print-outs at a high print speed.

• Mostly used in professional and semi-professional settings because of their high cost.

• Technology that is close to that used by photocopiers.

• Mainly made up of an elecrostatically charge photosensitive drum that attracts the ink in order to make a shape that will be deposited on the sheet of paper.

Laser technology

• a primary charge roller gives the sheets of paper a positive charge.

• The laser gives a positive charge to certain spots on the drum with a pivoting mirror.

• Then, negatively charged ink in powder form (toner) is deposited on the parts of the drum that were previously charged by the laser.

• By turning, the drum deposits the ink on the paper. A heating wire (called a corona wire) finally attaches the ink to the paper.

Printer Features: Laser printer Specifications

Print Technology: ElectrophotographyLaser

Print SpeedPPM (pages per minute)

4 - 50 PPM

for industrial printersup to 1000 PPM

Graphics Resolution 300 - 2400 DPI

Copies (Original +) 0

Workload (Duty cycle)PPM (Pages per month)

6,000 - 300,000 PPM

for industrial printersup to 18 million PPM

Price [US$]200 - 8,000 $

for industrial printersup to 1,000,000 $

Cost Per Page(Cost/cents ¢) 1.0 - 8.7 ¢

Advantages and disadvantages

Advantages• Laser prints are generally very

high and very accurate. • For high volume printing laser

printers are considerably cheaper to run.

• Printing is fast so they can handle large volumes.

• Due to the technology used prints from a laser printer emerge from the printer dry to the touch.

Disadvantages • Buying a laser printer can

be expensive when compared to an inkjet.

• Colour laser printers are significantly more expensive than a colour inkjet.

• Laser printers are larger and heavier as they need to contain the imaging drum and laser technology.

Thermal printers• Uses a thin plastic ribbon

with a thin coating of wax or resin based pigment.

• The ribbon and labels feed from separate rolls and are squeezed together by a roller as they pass under the thermal printhead .

• The heating elements in the printhead melt the coating which transfers to the label to form the image.

• Produces a durable, high-quality image,

• Can be used with many types of label stocks (paper and synthetics).

• Durable and offer relatively fast printing speeds; some models approach 12 inches per second.

Future technologies

• HP offers future printing technologies Printer makes 2,600 pages per minute

introducing a new ink-jet printer that prints thousands of pages per minute and ink that retains its shine even when exposed to extreme elements.

Xerox

• Xerox is developing a new printing technology which does not require ink of any kind. The new technology includes reusable paper which can be printed and erased dozens of times .

Memjet technology• Memjet technology is a

patented breakthrough in print engine components that delivers the benefits of ink and laser technologies at radically new price/performance levels.

• Memjet technology is comprised of four tightly integrated components: page-width printheads, driver chips, ink and software.

• Customized water-based inks ensure great print quality whether printing photos, office documents or industrial labels

summary

Introduction

Connecting Printer to a PC

Important factors to consider

Printer Classification

Commonly Used Printers and Technologies

Future Technologies

Thank you !

Group members

Thilina Gurugama

ge

C.D Gamage

B.L.D Gamage

Ismail Jaleel

I.H Hasitha Dananjaya