P rinters

1. Printers

2. Introduction

3. What is a Printer? • In computing, a printer is a peripheral which produces a hard copy of documents stored in electronic form.

4. Printer classification Two primary technologies used for printing

5. Printer I/O Interfaces • The most common I/O interface for printers has been the parallel interface with a 36 - pin plug. • New printers and computers are using serial interface, especially Universal Serial Bus or Fire Wire.

6. Printer Languages • Printer languages are commands from the computer to the printer to tell the printer how to format the document being printed. • These commands manage font size, graphics, compression of data sent to the printer, color, etc.

7. Printer Qualities • Colour • Resolution • Speed • Memory

8. commonly used printers and their technologies

9. Dot matrix printer • Extremely useful when the actual printed content is much more important than the quality of the print. • Commonly used for printing invoices, purchase orders, shipping forms, labels, and other multi-part forms. • Can print through multi-part forms in a single pass, allowing them to produce more pages than even high-speed laser printers.

10. Dot matrix printer • Use a set of closely spaced pins and a ribbon to print letters or other characters on a page. • These printers actually impact the page to print a character, much like a typewriter. • Dot-matrix printers vary in terms of speed and the number of pins (9-24) they have. • They can run at a speed anywhere between 50 and 500 CPS (Characters Per Second).

11. Daisy wheel printer • Able to produce letter- high quality text (unlike dot matrix printers, which created fuzzy, low-quality characters). • These printers were slow, couldn't print graphics, and often incredibly loud.

12. Daisy wheel printer • Simply a metal or plastic disk sliced into thin strips toward the center. • A raised letter or character resided at the outer end of each strip. • To print, the printer would spin the wheel to the correct character, and a hammer would strike it, forcing the character through an inked ribbon and onto the paper.

13. Inkjet printer • Maintaining excellent quality at an affordable price. • Capable of producing high quality print which almost matches the quality of a laser printer. • Almost all ink-jets offer a color option as standard, in varying degrees of resolution etc.

14. Inkjet printer • Ink-jets printers spray ionized tiny drops of ink onto a page to create an image. • This is achieved by using magnetized plates which direct the ink's path onto the paper in the desired pattern. • A standard ink-jet printer has a resolution of 300 dots per inch.

15. Inkjet printer

16. Bubble jet printer • The principal difference between bubble-jet printers and ink-jet printers is that • bubble-jet printers use - special heating elements to prepare ink, • ink-jet printers use - piezoelectric crystals to prepare ink.

17. Bubble jet printer • Ink bubble forms inside the nozzle and a tiny drop of ink is expelled at high speed. • When the drop hits a paper surface, it forms a round dot of even density and color. • The heating element is switched on and off in response to data from a computer, which processes the information from an image file.

18. Bubble jet printer • To speed things up, use multiple nozzles for each color of ink and combines all the nozzles into a single print head. • High quality, Speed and Low cost.

19. Thermal printer • A thermal print head melts wax-based ink from the transfer ribbon onto the paper, when cool it’s permanent. • These printers print images as dots, which means that images must be dithered first. As a result, images are not quite photo-realistic, although they are very good.

20. Thermal printer • Don't require special paper (e.g. in dye transfer printers) and they are faster, quit and economical etc. • Commercial applications – filling stations pumps, point of sales systems and voucher printers etc.

21. Laser printer • Operate by shining a laser beam to produce an image on a drum. • Then the drum is rolled through a pool, or reservoir, or toner, and the electrically charged portions of the drum pick up ink. • Finally, using a combination of heat and pressure, the ink on the drum is transferred onto the page.

22. Laser printer • Laser printers print very fast, and the supply cartridges work a long time. • Color laser printers use the same toner-based printing process as black and white (B/W) laser printers, except that they combine four different toner colors.

23. Special types of printers

24. Plotters • Large-scale printers those are very accurate at reproducing line drawings. • Commonly used for technical drawings such as engineering drawings or architectural blueprints etc. • The two basic types of plotters • flatbed plotters • drum plotters.

25. Label Printer • The smartest way to print labels one at a time.  • The printers allow easy installation.  • Can  get high-quality, professional results every time

26. CD/DVD Printer • Provide a low cost way to create professional printed CD-R and DVD-R. • Can print directly on the CD or DVD surface. • With high speed and can print full color image.

27. Multifunctional Printers • A machine combined top-quality color ink-jet or laser printing with PC faxing, color copying, color scanning and telephoning etc. • All in one, convenient, space-saving machine.

28. Versa-LaserTMPrinter • Peripheral tool that can transform images or drawings on your computer screen into real items made out of an amazing variety of materials. • Wood, Plastic, Fabric, Paper etc. • Versa-Laser™  is a brand name. (Universal Laser Systems Inc.)

29. 3D Printers • Creates physical models directly from computer-aided design system (CAD) and other digital data. • The printer is fast, versatile and simple. • Allowing engineers to produce a range of concept models and functional test parts quickly and inexpensively.

30. Summary

31. Group members • - IIT JANUARY INTAKE – 2009 - • Basura Ramanayake 2008082 • Isuru Samarasinghe 2008098 • Rishikeshan Parasuraman 2008086 • Udayashangari Sivaji 2008085

32. Thank You