China
Africa
Explore chapters and articles related to this topic
Using computer software packages to assist engineering activities
Published in David Salmon, Penny Powdrill, Mechanical Engineering Level 2 NVQ, 2012
Dot matrix printers – These are less widely used than they used to be. They work by causing a printhead with blunt pins on it to strike the paper through a ribbon rather like a typewriter's ribbon. Most dot matrix printers use continuous paper which is paper pleated into a large stack. The sides of the paper have holes punched that feed the paper through the printer. One major advantage of this type of paper and carriage is that the paper can be in different sizes and can print large spreadsheets. A common use for dot matrix printers is issuing invoices. The reason for this is that because the image is produced by impact, a second copy can be formed – one for the customer and one for the company. These printers are noisy!
The BEMS central station
Published in G.J. Levermore, Building Energy Management Systems, 2013
Although they are now rather dated, there are still many dot matrix printers in use with BEMSs. Dot matrix printers and their consumables are cheaper than inkjet or laser printers and their consumables. The dot matrix printhead consists of between 7 and 27 pins arranged vertically. Each pin is controlled by its own electromagnet which moves the pin down when it receives a signal voltage. The appropriate pins are struck against an inked ribbon and the paper to form the characters. This is for draft-mode printing. Slower, higher-quality printing requires letter-quality mode, where the printhead strikes the pins twice for each character, its position slightly shifted between strikes.
Characterization of Arc Plasma by Movable Single and Double Langmuir Probes
Published in Fusion Science and Technology, 2019
Ghanshyam Thakur, Raju Khanal, Bijoyendra Narayan
A high-voltage dc is prepared by rectifying a three-phase alternating-current supply using an arrangement of diodes of 6 A and 100 V each. A movable system is made from a body of a dot matrix printer that moves to and fro uniformly through the arc. A cylindrical platinum wire is inserted into a ceramic hollow tube and insulated using clay except on the tip of the probe. Schematic diagrams for the single- and double-probe methods are shown in Figs. 1 and 2, respectively.