Non-Impact Printers - Assignment of GCU Lahore PDF

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Assignment of GCU Lahore...

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Computer Applications-I (CA-1201) BA/BSc (Hons) 2019-2023 2nd Semester

Non-Impact Printers

Submi t t edt oSi rOsamaTar i q Theory Teacher Name (Sir Osama Tariq) Department of Computer Science GC University, Lahore

Submi t t edby Saqib Javaid

2237-BH-PS-19

[email protected]

Theor ySec t i on E2

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Table of Content Introduction to Topic Definition

3

Examples

3

Salient features of Non-Impact Printers

3

Benefits of Non-Impact Printers

3

Laser Printers

4

Mechanism of working of laser printer

4

Advantages

5

Disadvantages

5

Inkjet Printers

6

Mechanism of working of inkjet printer

6

Advantages

6

Disadvantages

7

Thermal Printers

7

Mechanism of working of thermal printer

7

Advantages

7

Disadvantages

7

Internet Sources Used

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Non-Impact Printers 1.1 Definition: “Non-impact printers are printers that form characters and images without direct physical contact between the printing mechanism and the paper. Non-impact printers use a cartridge filled with toner or liquid ink, which allows them to produce fine-quality images quickly and quietly.” Examples of non-impact printers include: 

Laser printers: laser printers have a cylindrical drum that rolls electrically charged ink onto the paper.

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Inkjet printers: Inkjet printers make pictures with small dots; they spray small drops of ink on the page through four nozzles through a high-speed die hole on paper. Thermal printers: With thermal printers, the output characters are created by a



special heat element paired with special heat-sensitive wax paper, when dark spots are formed with a constant temperature.

1.1.1 Salient Features of Non-Impact Printers Following are the important features of the non-impact printers: 1. Non-impact printers create characters and images without direct physical contact between the printing system and the paper. 2. Printing on non-impact printers involves depositing ink on paper in any form. 3. Non-impact printers are very fast and they can print multiple pages per minute. 4. Non-impact printers do not have a high noise level because the print head does not use a chain mechanism that taps on ribbon and paper. The process of applying ink or toner on paper is virtually silent. 5. Non-impact printers use laser, special ink sprays or heat and pressure to print on paper. 6. The print quality of a non-impact printer is better than that of an impact printer. 7. Non-impact printers use toner or bullets to print on paper. Non-impact printers use the latest printing technologies.

1.1.2 Benefits of Non-impact Printers  Faster than impact printers. 3|Page

 They are not noisy.  High quality.  Support many fonts and different character size.  They can print up to 24 pages per minute.  Non-impact printers don’t dent or tear the surface of the paper.

1.2 Laser Printers “Laser stands for Light Amplification by Simulated Emission of Radiation”. Laser printers are high speed, high quality non-impact printers. Works like a copier. Laser printers use laser technology and toner to convert the output image to paper. Toner is ink powder. Used in laser printers and copiers. Laser printers print at approximately 4 to 32 pages per minute for microcomputers and 200 pages per minute for mainframe computers.

1.2.1 Mechanism of Working of Laser Printers They work with heated wire to charge the drum positively, which then changes the charge at the point where it hits the drum. The area where the drum is currently negatively charged represents the printed image or text. As the toner roller passes over the top of the drum, the toner particles are matched to the negatively charged areas. The paper toner is placed under the drum to allow the toner to penetrate its surface and to make a printer copy of the digital document or image. Since the first laser printer hit the market in 1976, laser printing has established itself as a reliable and effective printing solution. Laser printers incorporating laser beam technology are ideal for offices and busy workplaces to provide high accuracy output.

Step by Step Printing Process The laser printing process is fundamentally different from the inkjet printing process, which uses a stream of precise ink to print on paper. The laser printing process has nine main steps. 1. Transfers data required for printing from computer to laser printer. If the printer has wireless capabilities this is usually done via an Ethernet cable or wireless.

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2. After that, the corona wire should be heated and the printer should reach the required temperature. When heated, this wire transfers static electricity to the drum unit. 3. The positively charged drum unit is ready to receive the laser beam and start the data transfer process directly to the drum. 4. - When the laser is activated, the moving mirror unit reflects the beam, directing the beam directly to the drum unit. 5. - At the point where the beam hits the drum, the charge changes from negative to positive. The negatively charged areas represent the area where the toner particles are attached to the drum and transferred directly to the paper. 6. - The ink roller starts to coat the drum with toner. The toner contains microscopic ink particles that are now positively charged and adhere to the negatively charged areas of the drum unit. 7. - Positively charged paper passes and negatively charged toner particles are attracted to the page near the drum. 8. - The inked paper is sent to the fuser unit, where the rollers attach the toner particles to the paper. 9. - The page is then transferred to the other side of the copier and a print wins. 1.2.2 ADVANTAGES 

Very high speed

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Very high quality output



Give good graphics quality

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Support many fonts and different character size

1.2.3 DISADVANTAGES 

Expensive.

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Laser printer prints one page at a time. Cannot be used to produce multiple copies of a document in a single printing.

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1.3 Inkjet Printers Inkjet printers are a type of impact printer. Sprinkle a small drop of liquid ink on the paper to create the output. Inkjet printers have print heads that can spray very small drops of ink. It contains a print cartridge filled with liquid ink, as well as small nozzles in a matrix. Similar to dot matrix printers, the combination of nozzles that spray liquid ink is activated to form a character or image shaper on paper. The resolution of these printers is 300-720 dpi. Inkjet printers print at speeds of 1 to 6 pages per minute.

1.3.1 Mechanism of Working of Inkjet Printers Inkjet printers are computer peripherals that spray ink on paper to make hard copies. A standard inkjet printer can make copies at a resolution of at least 300 dots per inch (dpi). Some inkjet printers can produce full color hard copies of 600 dpi and above. Many models include scanners, copiers, dedicated fax machines, and printers in one box. In inkjet printing, the printhead has some small nozzles, also known as jets. As the paper passes through the printhead, the nozzles expel the ink and form letters and images. Depending on the nature of the hard copy, inkjet printers can produce 100 to hundreds of pages before replacing the ink cartridge. Typically, a black ink cartridge contains a primary color (cyan, magenta, yellow) ink called a color cartridge. Some inkjet printers use a single bullet with cyan, magenta, yellow and black ink. Some models require a separate shot for each major pigment, along with black ink shot. 1.3.2 ADVANTAGES 

High quality printing

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More reliable

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lightweight and compact desktop footprint

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Colour printing is also possible

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The ink-jet printers have low price than laser printers.

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High-end inkjet printers are able to render digital images on special paper of a quality comparable to professional glossy or matte photos

1.3.3 DISADVANTAGES 

Expensive as cost per page is high

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Slow as compared to laser printer

1.4 Thermal Printers Thermal printers are another type of non-impact printer. It can print output only on special thermal wax paper. Image when printing dots on wax paper to create output. Colored wax sheets are used for colored printing.

1.4.1 Mechanism of Working of Thermal Printers Thermal printers work in one of two ways. For older models, thermal paper is used by putting the roll in a container inside the machine and pasting the end of the roll into the slot. The heat stored in the machine reacts with the thermal paper, transferring the pigment to the film sheet. The new machine uses ribbon printer cartridges. A substance like wax is stored inside the ribbon cartridge. During use of the printer, the paper passes through the slot between the printhead and the rollers. There, the hot material melts and adheres to the paper. 1.4.2 Advantages  They are quite inexpensive than other printers  They are less costly in printing.  Thermal printers are easy to use overall.  They are used in offices and shopping centers for the POS machines. 1.4.3 Disadvantages  Sometimes print quality is blurred.  It has less pixel density.  Not good for the image printing.  Cannot print in multiple colours.  Thermal printers do not use ink very efficiently

INTERNET SOURCES Used: 7|Page

------------------------------------------------------------------------------------------https://vivadifferences.com/difference-between-impact-and-non-impactprinters-with-examples/ https://www.caclubindia.com/forum/information-technology-notes-92766.asp https://www.techopedia.com/definition/3614/non-impact-printer-nip https://byte-notes.com/types-printers/ https://computerbasicinformation.blogspot.com/2012/07/non-impactprinters-and-its-types.html https://techspirited.com/how-does-laser-printer-work https://www.transtutors.com/questions/photocopy-machine-a-photocopymachine-works-by-arranging-positive-charges-in-the-pat-715415.htm https://hubpages.com/technology/All-About-Laser-Printers https://www.tonerbuzz.com/blog/the-laser-printing-process/ https://quizlet.com/256288006/laser-printers-flash-cards/ https://h30434.www3.hp.com/t5/Printers-Archive-Read-Only/Printer-printsone-page-at-a-time/td-p/5952719 https://whatis.techtarget.com/definition/inkjet-printer https://etgdesign.com/technology/cmyk https://castleink.com/blogs/printer-help/how-do-thermal-printers-work https://www.labelvalue.com/articles/guides/what-is-the-difference-betweendirect-thermal-printing-and-thermal-transfer-printing-t-176.html

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