Cam 2 is rigidly attached to drum 1 and rotates about fixed axis A. Follower 3 turns about fixed axis B and carries roller 4 which rolls along working surface a of cam 2. Flexible band b with lining 5 encircles drum 1. Band b has at one end threaded rod 6 which passes through guide d of follower 3. The other end of band b is secured to follower 3. The tension of band b is adjusted with nut e which acts through spring 7. The brake is applied at a certain point by the action of cam 2 on roller 4 and follower 3, thereby tightening band b.
$3127$SmC,Br$