Roller follower
There is a rapid rate at which the knife-edge wears. Therefore roller follower is preferred to knife-edged follower because there is almost no wear because in case of roller follower the relative motion is rolling and not of sliding type
A camshaft is driven by a linkage from the crankshaft, and operates your valves; directly in an OHC setup, and via pushrods otherwise. Cam "follower" is just an updated "roller bearing" for a camshaft.
emitter follower is a type of negative feedback ,
A: Any transistor of either polarity can be used as an emitter follower, The purpose of an emitter follower is to provide current to the load since it cannot provide any voltage gain
Car Engines
in A toy certainly
The follower on the gun is a spring loaded portion of the gun that is used to push the next bullet up into the feeding position within the gun. The follower is found in the action of the gun.
The answer to your 'used roller conveyor' question is yes. There are many sites such as www.ebay.com - www.aapalletrack.com/mhe-used-roller-conveyor.htm - www.heavydutyconveyor.com/are/used-conveyor-systems.php
Car Engines
big booty hoes
can be used in a driverless car