Step 1: Understand the context. All the machine parts listed (Taker-in, Cylinder, Flats, Doffer) are key components of a Carding machine. The primary function of the card is to open fiber tufts into individual fibers.
Step 2: Analyze the function of each part in sequence.
- A. Taker-in (or Licker-in): This is a small, fast-rotating roller with saw-tooth wire. It is the first main working element. It plucks small flocks of fiber from the feed roller and performs the initial, aggressive opening.
- B. Cylinder and C. Flats: The taker-in transfers the fibers to the main Cylinder, which is a very large, fast-rotating drum covered in fine wire points. Above the cylinder are the Flats, which are bars also covered in wire points that move slowly in the same direction as the cylinder. The very close gap between the fast-moving cylinder and slow-moving flats performs the main carding action: the final individualisation of fibres and the elimination of neps and trash.
- D. Doffer: This is a smaller roller, also with wire points, that rotates much slower than the cylinder. Its surface moves in the same direction as the cylinder at the point of interaction. Its job is to take (or strip) the individualized fibers from the cylinder surface and condense them into a web.
Step 3: Match the parts with their functions.
- A (Taker-in) III (Pluck the flocks from feed roller).
- B (Cylinder, in conjunction with flats) I (Individualisation of fibres).
- C (Flats, in conjunction with cylinder) IV (Elimination of neps).
- D (Doffer) II (Takes the fibers from cylinder surface).
Step 4: Assemble the combination. The correct matching is A-III, B-I, C-IV, D-II. This corresponds to option (D).