Breech drive for a weapon

摘要

The invention relates to a mechanism or drive (100) for a weapon, wherein the rotational motion of a motor (2) and the like is converted to a forward or reverse motion of the breech (3) in a simple manner using the Scotch yoke (8) principle. In order to allow the rest periods of the breech (3) in the end positions, the yoke radius is defined by a control cam (15) which however changes when the yoke (8) is rotated. The hinge pin of the yoke (8) is for example externally driven via a pinion shaft (14). A yoke pin (9) is arranged in a groove (17) of the yoke (8) so as to be radially displaceable and carries the breech carrier (5) or the breech (3) in a groove (16) extending at a right angle to the direction of fire via a sliding block (11). Two elements (10), for example rollers, are arranged on the yoke pin (9) and run in control cams (15) in the weapon or yoke housing. The control cam (15) is subdivided into different sectors/sections thereby achieving the desired motion of the breech (3).