Dot matrix printing

A dot matrix printer makes words.

It uses many tiny metal pins. These pins move back and forth. They hit an ink ribbon. This hits the paper hard. The pins make many little dots. These dots form letters and shapes. You can use special paper to make copies. It can even use long paper.

This printer makes a loud noise when it works. It is a very useful machine.

A dot matrix printer makes images and words using dots.

It is an impact printer. This means it prints by hitting things. Inside the print head, there are many tiny metal rods. We call these pins.

Small magnets called solenoids push these pins forward. The pins strike an ink-soaked cloth ribbon. This ribbon hits the paper to leave a mark.

Unlike a typewriter, these printers can make any shape. They do this by placing dots in patterns. Some printers use 9 pins. Others use 24 pins. More pins can make the dots look better.

These printers have special uses. They can print on multi-part forms. This lets you make several copies at once. They can also use long, continuous paper.

These machines can be loud. They make noise when the pins strike the ribbon. Even so, they are very cheap to run.

A dot matrix printer is a special kind of machine used to print words and pictures.

It is known as an impact printer. This means it works by physically striking a surface to leave a mark. Unlike a typewriter that uses fixed letters, these printers use a pattern of small dots. This allows them to print almost any shape or font. They are very useful because they can print on many different types of paper.

To understand how it works, imagine a tiny hammer hitting a stamp. Inside the print head, there are many small metal rods called pins.

These pins are moved by tiny electromagnets called solenoids. When the printer needs to make a dot, the solenoid pushes a pin forward. The pin strikes an ink-soaked cloth ribbon against the paper.

The print head then moves back and forth across the page. This process repeats many times to build up a full line of text.

People have been working on this technology for a long time. In 1925, Rudolf Hell invented a device called the Hellschreiber. This was an early version used for sending messages. Later, between 1952 and 1954, Fritz Karl Preikschat created the PKT printer in Germany. In 1968, the company OKI introduced the Wiredot, which was a serial impact dot matrix printer.

This printer was used by schools and scientists. It could print 128 different characters using a small grid of dots.

There are many different models and ways to use these printers. Some printers use 9 pins, while others use 24 pins.

A 24-pin printer can overlap dots to make the text look much smoother. In 1970, Digital Equipment Corporation released the LA30 printer. It could print 30 characters every second. By the mid-1980s, these printers became very popular because they were fast and inexpensive. The Apple ImageWriter was a famous model used by many people at home.

Dot matrix printers are different from the inkjet or laser printers we see today. While they can be quite noisy, they have a very special skill. Because they use physical pressure, they can print on multi-part forms. This allows a person to make several copies of a document at the same time.

They can also use continuous paper that is folded like a fan. This makes them great for printing long lists or receipts.

Dot matrix printing, also known as impact matrix printing, is a computer printing process. It uses a low-resolution dot matrix to create layouts on a surface. This method is classified as an impact printing technology. Unlike inkjet or laser printers, it relies on physical contact to transfer ink.

This capability makes it unique in the world of computer hardware. It remains useful for specific tasks that require physical pressure.

The mechanism of a dot matrix printer is a mechanical process. The print head contains a fixed number of small metal rods called pins or wires.

These pins are driven forward by tiny electromagnets known as solenoids. Each solenoid can act on a pin, either directly or through small levers called pawls.

As a pin moves, it strikes an ink-soaked cloth ribbon against the paper. The print head typically moves in a back-and-forth or up-and-down motion. This movement allows the pins to create a pattern of dots. These dots combine to form characters or arbitrary graphics.

There are several distinct types of dot matrix printers. Serial impact dot matrix printers (SIDM) use a horizontally moving print head. This head usually features a vertical column of pins.

Some designs use up to four slightly displaced columns to increase dot density. This technique is called interleaving. Another type is the line matrix printer. These use a fixed print head that is almost as wide as the paper path. A line matrix printer uses thousands of pins to print a whole line at once. There is also a variation called the cross hammer dot printer. This uses a spinning, fluted cylinder and a hammer to mark dots.

The history of this technology spans many decades. In 1925, Rudolf Hell invented the Hellschreiber, a facsimile-like teletypewriter. Fritz Karl Preikschat later developed the PKT printer in Germany between 1954 and 1956. In 1968, the Japanese manufacturer OKI introduced the Wiredot. This was the first serial impact dot matrix printer.

Digital Equipment Corporation (DEC) entered the market in 1970 with the LA30 printer. By the mid-1980s, dot matrix printers were outselling daisywheel printers. They were favored for their high speed and versatility. The Apple ImageWriter became a popular consumer model during the 1980s.

Specific technical details define the quality and speed of these machines. The resolution depends on the number of pins in the print head. Common configurations include 9-pin and 24-pin models.

A 24-pin printer can overlap adjacent dots to produce near letter-quality (NLQ) output. This improves visual quality but often reduces speed. Speed is measured in characters per second (CPS). The DEC LA30 printed at 30 CPS. However, line matrix printers are much faster. They can achieve throughputs of up to 800 pages per hour. They can also print more than 1000 CPS.

Dot matrix printers offer unique advantages over non-impact methods. Because they use mechanical pressure, they can print on multi-part forms. This allows for the simultaneous creation of multiple copies. These copies can even be on different colors of paper.

They also support the use of continuous, fanfolded paper with tractor holes. This makes them ideal for long documents like receipts. Despite being noisier than laser printers, they have very low printing costs per page.

This technology connects to broader developments in computing and communication. The design of Centronics printers led to a parallel electrical interface. This interface became a standard for most printers until the late 1990s. This was when the Universal Serial Bus (USB) began to replace it. Dot matrix printing also shows the evolution of digital character representation. While modern printers use higher resolutions, the concept of using a bitmap for layout remains a shared foundation.