United States Patent US2285627
Inline Bottle Filler 
The inline bottle filler is typical of a motion control application generally referred to as a flying shear. This application is common to several industries such as filling, cutting, punching, stamping, forming, labeling, and printing. Flying shear applications require work to be performed on a material while the material is in motion. A flying shear control must accelerate from a stop to match the speed of the moving material at a specific position, and then maintain synchronization of both position and velocity while the work is performed. After the operation is completed, the tool decelerates to a stop and returns to the start or home position. When the correct point on the moving material approaches, the process is repeated. The motion of the flying shear occurs within a fixed distance which cannot be exceeded, so the control must accelerate, track the material while the operation is performed, and decelerate within this distance at the maximum machine throughput.
