The utility model provides an intensive drive mechanism, including bottom plate, crank, take -up pulley, driving gear, driven gear, chain and arrestment mechanism, driving gear, driven gear and take -up pulley are rotatable must to be set up on the base, the take -up pulley is equipped with two, arrestment mechanism includes casing, brake axle, canceling release mechanical system and arresting gear, canceling release mechanical system is including reseing board and reset spring, arresting gear includes handle, pivot and braking piece, the utility model discloses but be equipped with take -up pulley control chain's tensioning, thereby arrestment mechanism plays the effect of braking through the steerable driven gear's of brake axle rotation, the utility model discloses simple structure, transmission convenience, operation are reliably, arresting gear convenient operation, canceling release mechanical system can let the brake axle get back to initial state, need not other operation, convenient operation.