How the drive pulley is "driven"

A chain is put around the Drive Pulley Sprocket and the motor sprocket.

The chain moves when the motor is started.
The chain turns the drive pulley.

But....

Because a motor turns very fast (1750 times per minute). . .
A SPEED REDUCER must also be used.
The SPEED REDUCER is put between the motor and the drive pulley.

. . . The motor is connected to the reducer with a V-Belt (like the fan belt in your car) or a "C" Face Coupling.

The reducer is connected to the drive pulley with a chain . . . Now the Drive Pulley turns slower.

All those parts (the motor, the speed reducer, and the drive pulley) are called:

The Conveyor Drive

But what about the tail pulley?

The tail pulley is located at the tail end of the conveyor and it turns freely.

Now a "belt" can be put around the pulleys.

The Drive Pulley turns and moves the belt around . . . and around . . . and around.

BUT . . .

. . . it is dangerous to have the belt hang down under the conveyor bed - So small rollers are put into the Conveyor Bed to hold up the belt.

These turn freely -- and just idle. They are called "Return Idlers".