The track is driven by a drive sprocket at the rear, with an idler at the front.
From the en.wikipedia.org
Each camera model has a different location for the sprocket which advances the film.
From the en.wikipedia.org
Bruises, scrapes, gouges and the occasional greasy sprocket imprint are not uncommon.
From the dailyherald.com
Fixed and single-speed bikes have just one sprocket on the rear wheel.
From the thisisbristol.co.uk
But when the links reach the sprocket, they bend slightly as they curl around the gear.
From the sciencedaily.com
The tank had a sprocket to the front of the hull, on each side, and a tensioner to the rear.
From the en.wikipedia.org
There are also special hobs designed for special gears such as the spline and sprocket gears.
From the en.wikipedia.org
It is framed at the edges with sprocket holes, so we feel we are looking at a vast reel of film.
From the guardian.co.uk
Downing's rear sprocket has just come off worse in a close encounter with a stray plastic bag.
From the independent.co.uk
More examples
Roller that has teeth on the rims to pull film or paper through
Thin wheel with teeth that engage with a chain
Cog: tooth on the rim of gear wheel
A sprocket is a profiled wheel with teeth that meshes with a chain, track or other perforated or indented material. It is distinguished from a gear in that sprockets are never meshed together directly, and differs from a pulley in that sprockets have teeth and pulleys are smooth.
Sprocket (Amelia Barnhardt) is a fictional character in the Marvel Comics Universe where she was primarily a pilot for the superhero team the New Warriors. Her first appearance was in Night Thrasher: Four Control #2. ...
Action Masters was a sub-line of the Transformers toy line.
(Sprockets (television)) Sprockets was a recurring fictional West German television talk show sketch created by actor, writer and comedian Mike Myers with Canadian actor Dana Andersen for Second City Theatre. ...
(Sprockets (TV series)) Sprockets is a Canadian short film television series which aired on CBC Television from 1975 to 1976.
A toothed wheel that enmeshes with a chain or other perforated band; The tooth of such a wheel; A flared extension at the base of a sloped roof