Pequeno estojo cuja função é alojar a bobina. Permite à bobina desenrolar a linha no momento certo e com a tensão adequada de modo a formar um ponto perfeito.
Meaning
A small case into which the bobbin is inserted and threaded, which is then inserted into the sewing machine. Bobbin cases are commonly used in sewing machines which have vertical bobbins. (www.tomfarrell.org/text...)