Step 1: Understanding the Question:
The question asks to identify a mechanism whose primary function is to convert motion (typically rotational) into a repeating back-and-forth linear motion (reciprocating) or a back-and-forth pivoting motion (oscillatory).
Step 2: Detailed Explanation:
Let's analyze the function of each drive system:
Gear Drive: Transmits rotational motion and torque between shafts, usually with a change in speed. The output motion is also rotational.
Belt Drive: Transmits rotational motion between parallel shafts using a belt and pulleys. The output motion is rotational.
Cam and Follower: This mechanism consists of a shaped component (the cam) that rotates, and another component (the follower) that is in contact with the cam's surface. As the cam rotates, its non-circular profile pushes the follower, causing it to move in a prescribed reciprocating or oscillatory pattern. This exactly matches the question's description. A classic example is the camshaft in an engine opening and closing valves.
Chain Drive: Similar to a belt drive, it transmits rotational motion and torque between shafts, but uses a chain and sprockets for positive, non-slip transmission. The output motion is rotational.
Step 3: Final Answer:
The Cam and Follower mechanism is specifically designed to convert rotary motion into reciprocating or oscillatory motion. Therefore, option (C) is the correct answer.