A system for locking a position of an operable sash in a window frame has a motor, a rotating element connected to the motor, and a sweep cam. The sweep cam is configured to rotatably engage a keeper disposed on a sash disposed opposite the operable sash. A spur gear operatively connects the rotating element to the sweep cam.

A locking device includes a first side plate and a first driven screw. The first side plate includes a first moving track with a first driving member extending along the first moving track and a first driven screw includes a first threaded rod; and a first follower mounted to an end of the first threaded rod and coupling with the first driving member. When the first driven screw moves along the first moving track, the first follower is driven to rotate by the first driving member, thereby driving the first threaded rod to rotate along a locking direction or an unlocking direction. An enclosure is further disclosed.

A locking device includes a first side plate and a first driven screw. The first side plate includes a first moving track with a first driving member extending along the first moving track and a first driven screw includes a first threaded rod; and a first follower mounted to an end of the first threaded rod and coupling with the first driving member. When the first driven screw moves along the first moving track, the first follower is driven to rotate by the first driving member, thereby driving the first threaded rod to rotate along a locking direction or an unlocking direction. An enclosure is further disclosed.