Question

Which seed metering mechanism in a planter brushes out excess seeds from the cells of the feed mechanism?

• A. Edge drop
• B. Cut off
• C. Knock out
• D. Flat drop

Hint:

Think of the fixed brush or wiper that levels off a cell as it rotates past the seed pool.

Answer 1

The Correct Option is B

Step 1: In a planter, the feed or metering mechanism has cells that pick up seeds from the seed box and carry a fixed number forward to be dropped.

Step 2: Sometimes more seeds than needed stick in or above a cell as it fills up. To keep delivery uniform, a fixed brush or blade called the cut-off is placed close to the rotating feed mechanism.

Step 3: As each cell passes this cut-off, it brushes away the extra seeds sitting above the cell, letting only the seeds that are actually inside the cell continue on to the seed tube. This prevents doubles or clumps in the seed drop.

Step 4: Edge drop and flat drop only describe where the cells sit on a rotating plate, on the edge or on the flat face, and knock out generally refers to physically releasing a seed held by suction in a vacuum-plate planter, not to removing excess seed from a cell.

So the mechanism that brushes out excess seeds from the cells is the cut-off, option 2.