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A buttonholer is an attachment for a sewing machine which automates the side-to-side and forwards-and-backwards motions involved in sewing a buttonhole. Most modern sewing machines have this function built in, but many older machines do not, and straight stitch machines cannot sew a zigzag stitch with which buttonholes are constructed.
A needlegun, also known as a needler, flechette gun or fletcher, is a firearm that fires small, sometimes fin-stabilized, metal darts or flechettes. Theoretically, the advantages of a needlegun over conventional projectile firearms are in its compact size, high rate of fire , and extreme muzzle velocity .
[1] The Dreyse needle gun of 1836 uses a paper cartridge with a priming as part of a sabot which cradles the projectile and is forward of the propelling charge. The needle-like firing pin projects from the bolt-face and pierces the cartridge when the breech is closed. On firing, the spring-loaded needle strikes the priming in the sabot.
Firearms use triggers to initiate the firing of a cartridge seated within the gun barrel chamber.This is accomplished by actuating a striking device through a combination of mainspring (which stores elastic energy), a trap mechanism that can hold the spring under tension, an intermediate mechanism to transmit the kinetic energy from the spring releasing, and a firing pin to eventually strike ...
A needle gun has a set of very fine chisels known as needles. The tool forces these needles against a work surface at variable speeds up to around 5,000 times per minute. [3] [2] Different models offer choices of number of needles, operating speed, and power levels. [3] Many models use compressed air, although electrical needle-guns do exist ...
With a mass of only 44.5 pounds (20 kg), it was the only complete machine gun at the time that could be carried by one man. In 1895, in response to the interest shown in the 40 pounds, air-cooled Colt-Browning M1895 ( Potato Digger ) in the U.S. machine gun trials, Hiram Maxim introduced his own air-cooled Extra Light gun weighing only 27 ...
Previous machine gun designs had to use multiple rails, which were not integral to the receiver, making the attachment and usage of optics more difficult. [7] Due to the increased use of suppressors, the EVOLYS was designed to be capable of having a suppressor permanently fitted without it affecting the weapon's performance. [13]
The push rod now took its reciprocating motion directly from a "follower" on this cam wheel. At the same time the machine gun used was also changed – an lMG 08 machine gun, the so-called "Spandau", replacing the Parabellum used with the prototype gear. At this time the Parabellum was still in very short supply, and all available examples were ...