operating cam造句

Early 13th century : In Flanders, an ingenious bell ringer invents a cylinder with pins which operates cams, which then hit the bells.
A pin on the right side of the bolt moves backward in grooves in an operating cam plate mounted to the right side of the receiver.
The bolt's operating cam then forces the bolt face to pivot downward, aligning a cartridge feed groove in the left side of the bolt with the chamber.
For vessels up to four feet in diameter and rated at not much over 125 psi, a hinged semi-elliptical door secured by lever-operated cam-locking T-bolts works essentially as quickly and as easily as the more commonly used rotating locking ring door.
The keys operate cams that operate a swinging lever to first unlock the pin-positioning cam that is part of the pinwheel mechanism; further movement of the lever ( by an amount determined by the key's cam ) rotates the pin-positioning cam to extend the necessary number of pins.
It's difficult to find operating cam in a sentence. 用operating cam造句挺难的