Sunday, 28 March 2021

Plotter Printer

What is Plotter Printer?

A plotter Printer is a specialized graphical printer that is operate by the moving a pen over the surface of a paper. It uses mechanical, inkjet or thermal technology to create a large format images. Because of this, plotters are use for printing technical drawing or CAD application images. A niche use of plotters is in creating tangible images for visually handicapped people on special thermal cell paper. A plotter uses applications for design such as computer-aided design it able to provide faster and higher quality images compared to the other printers. It produced by the line-drawing process. 
A desktop plotter it often used for business graphics. The early use XY-writers output device are digital control plotter which measures instruments and analog computers. The other printer which use to draw complex line art or text is pen plotter. It prints by moving a pen across the surface of the paper. Its performance is slow because of the movement of the pen. However a plotters produces large drawing and high color resolution which based on computer memory and a processor power which is very expensive and limited. The following plotter printer picture is given below.
Plotter Printer


Laser Printer

What is Laser Printer?

A laser printer refers to a type of printers where the printers uses a laser beam to produce images or text on a paper. The main components of a laser printers are drum and toner. A laser printers can print both in black-and-white and color. It can print with a speed of 4-16 ppm and a resolution of 300-1200 dpi and higher. The text and image are produce by passing a laser beam front and back repeatedly with a cylinder called a drum. It uses a toner to transfer the image to paper where toner is a collection of electrical charge powder ink.
The color laser printer prints 6000 pages per hours and it is a high-speed laser printers which is use in the workspace like office for printing huge number of pages and the cost of this technology is depending on the cost of paper, cost of toner, cost of drum replacements and cost of other replacements items such as fuser and transfer assembly. A color laser printers is commonly used colored toner such as cyan, magenta, yellow, and black. A toner cartridge contains smart chips which reduce the number of pages printed with an effort to increase sales of toner cartridge this technique also increases waste.
Laser Printer


Dye Sublimation Printer

What is Dye Sublimation Printer?

A dye-sublimation printers is refers to a type of printers. Thus the printer uses a printing process that utilizes a heat to transfer dye to a medium such as a printers paper, a plastic card or a poster paper. The printers are target primarily for printing a high-quality colour applications such as a colour photography and are less well-suite for a text. Therefore, they are commonly use as a dedicated consumer photo printers. The name sublimation was first applied due to a dye transition between the solid and a gas states without going to a liquid state and a dye-sublimation heat transfer imprinting a printers is use to imprint on a textiles by creating a transfer design in a imprinting printer. 

Then the all-over print process is done at a lower temperature with a higher pressures. In this there are separate panels which use for each colour therefore a dye is stored in the polyester ribbon. The size of the colour panel is a medium which is use for a print. For example, 6” by 4” printer has 6” by 4” panels. At the time of printing the roller move both medium and coloured panels together into the thermal printing head to print medium from the same width as the shorter dimension. Thus The temperature changes rapidly due to a tiny heating elements present on the head and into the printing medium, some of the dyes are diffuse.

Advantages

  • It prints clear images and gives good quality picture.
  • The printed images are not fade easily it gives permanents image.
  • It prints a hard surface with a different colors and a high quality. 
Dye Sublimation Printer


Inkjet Printer

What is Inkjet Printer?

An inkjet printer is a output device. It refers to a type of printer where the printer sprays tiny droplets of ink onto the media. These ink droplet are slightly electrical charge. The ink droplet place on the media is then determine by the charge of a cathode and electrode between which the ink moves towards the media. Inkjet printers can produce both color and black-and-white printing. They offer printing speed of 2-4 ppm and resolution of 300-600 dpi. Inkjet printers are inexpensive, have low operating cost and produce high-quality printouts because of this inkjet printers are the most widely used consumer printers. The advantages and disadvantages are given below.

Advantages

  • Its Prints a high resolution and photographic quality.
  • It estimation cost is low per page.
  • Its practically has no warm-up time and printing speed is very high

Disadvantages

  • Ink Cartridges contains a microchip that is use to communicate the estimated ink level of the printer this may cause the printer to display an error message.
  • The Ink cartridges cost is high and refilling them have addressed by third-party ink supplies.
  • Due to third party ink supplies, we are not able to apply for a warranty on a printer.
Inkjet Printer


Dot Matrix Printer

What is Dot Matrix Printer?

A dot matrix printer or impact matrix printer refers to a type of computer printers with a print head that contains a cluster of pins. The pins run back and front on the page and print by impact with striking an ink-soaked cloth ribbon against a paper similar to a typewriter. The Dot-matrix printers can print at a speed of 500 cps. Therefore a low-resolution dot matrix printers use 9 pins and a high-resolution dot matrix printer uses 24 pins. Then the low-resolution dot matrix is use to apply ink on the surface for layout. 

In this a printer is able to print different patterns but not only the specific characters. Then a Dot-matrix printers are work as a non-impact method such as laser printers or inkjet printers where they also use the same process for printing. In this each dots produce by a wire or pin which is a tiny metal rod. The tiny electromagnet give the power to move forward directly small levers and a ribbon mask holder which facing the papers is small guide plate it stabbed with holes to provides instructions for pins it is made of hard plastic.
Dot Matrix Printer


MICR Reader

What is MICR Reader?

The Magnetic Ink Character Recognition is widely used by a banks to process large volumes of cheques and a drafts. Therefore bottom line on all cheques and a drafts has a special characters which printed in a special font called a MICR. The Cheques are put inside a MICR reader. As they enter the reading unit the cheques are pass through the magnetic field which causes the read head to recognize the character of the cheques in a MICR line which uses a magnetic ink character recognition encoding. Therefore in the bottom of the cheque which contains a bank account number, a bank code, a cheque number, a cheque amounts and a control indicator. This are the banking process for filling a check form in a banks.

This technology scans and read directly in to a data collection device similar to a barcode technologies in which a humans are easily reads a MICR characters. Therefore a MICR characters are printed on a documents with one or two MICR fonts by using the magnetizable ink. This characters are read by a MICR reader head. Its waveform is easily identified by the system. The MICR readers is a primary tool for cheque which are utilized across the cheque distribution network at many stages. Finally the Magnetic Ink Character Recognition code is used for a reading the code line from the bank cheque book. The following pictures of a MICR reader and a MICR sample cheque are given below.
MICR Reader


Sample Bank Cheque

OMR Scanner

What is OMR Scanner?

The OMR scanner puts a shining beam of light on the document and detects the marked area from unmarked ones. This is possible because a marked area reflects more light in comparison to an unmarked area. An Optical Mark Recognition technique is use when students have appeared for objective type tests and they had to mark their answer by darkening a square or circular space by pencil. These answer sheets are directly fed to a computer for grading where OMR is use. Then users create their own forms in a word processor by using desktop OMR software and print it by a laser printer.

The process of desktop OMR software is to work with an image scanner with the help of a document feeder which produces forms once filled out. For adding marks on OMR sheets a folder inserter equipment is use. In the sequence of black dashes in sheets the marks are added and the folder inserter equipment scans in order to determine and the usage area of OMR sheets are, It normally used for conducting offline exams in exam center were candidates provided with question papers and the OMR answers sheets (Used to mark a dark circle in the answer sheets).
OMR Scanner


OCR Scanner

What is OCR Scanner?

OCR Scanner is generally use in the field of pattern recognition, artificial intelligence and machine vision. OCRs are more expensive than MICR, though they are better than MICR. Optical Character Recognition or Optical Character Reader is use for direct reading of any printed character. It translates images of handwritten or typewritten text, usually captured by a scanner, into machine-editable text. A  OCR is use as a form of data entry which used to print a passport documents, invoice, statements, computerized receipt, business cards, etc,. 

A Optical Character Recognition is a field of research in artificial intelligence, recognition and computer vision. An OCR is a type of images of electronic or mechanical combination. It is also used to convert a different types of document into a text. For example it convert printed character into a digital text. If you loss any important digital file such as passport, you can have a hard copy of it you will easily replace with it by using  OCR scanner with the help of OCR software. Once you’ve scanned your document using OCR, you have the option to edit the text. It can also scan a books, magazines and other documents in to a word processing unit.
OCR Scanner


Types of Database Server

What are the Types of Database Server?

The following types of Database Server are such that

  • Remote Database Servers
  • Local Database Servers

Remote Database Servers

It provides a common logical interface to clients. The common interface is such as Structured Query language (SQL). It is also known as SQL Servers or Remote Database Management Systems (RDBMS). Therefore the remote database applications are two-tier applications or multi-tier applications.

Types of SQL Servers

  • Oracle Server
  • Microsoft SQL Server
  • DB Server
  • Interbase Server
  • Informix Server

Local Database Servers

It operates in your local area network or local drive and it accesses the data by APIs. It is also known as File-Based Database Servers. Therefore the local database applications are single-tier applications.

Types of File Based Database Servers

  • Access Server
  • FoxPro Server           
  • dBASE Server
  • Paradox Server

Database Server

What is Database Server?

The database server is a server that maintains and shares any form of the database over the network. It is responsible for hosting one or more databases. The client applications perform database queries that retrieve data from or write data to the database that is hosts on the server and the client applications are like spreadsheets, accounting software, asset management software, or virtually any computer program that consumes well-organized data.

The term database server refers to a back-end system and the user’s computer refers to a front-end system of a database application using a client-server architecture. Therefore the database servers functionality was provided by database management systems (DBMS) and the database. It performs tasks such as data manipulation, data storage, data archiving, and data analysis.

The process of the database servers is the client execute SQL requests to the database servers and the database servers process the client executed database request, then the network computer displays the requested answers of SQL command to the client. Therefore in this whole process, the database servers provides its own power to execute the request or search the requested result. It is also known as the SQL Engine.

Benefits of Database Servers

  • High Performance
  • Optimized Data Access
  • Security
  • Scalability
  • Reliability

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