(a) Buyer in ordinary course of business. Except as otherwise provided in subsection (e) of this section, a buyer in ordinary course of business, other than a person buying farm products from a person engaged in farming operations, takes free of a security interest created by the buyer's seller, even if the security interest is perfected and the buyer knows of its existence.
(b) Buyer of consumer goods. Except as otherwise provided in subsection (e) of this section, a buyer of goods from a person who used or bought the goods for use primarily for personal, family or household purposes takes free of a security interest, even if perfected, if the buyer buys:
(1) Without knowledge of the security interest;