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A máquina de costura funciona através do entrelaçamento de dois fios: o fio superior, que passa pela agulha, e o fio inferior, que fica enrolado na bobina . Esse encontro entre os dois fios é o que forma cada ponto da costura. Quando a máquina é acionada, a agulha desce rapidamente e atravessa o tecido levando o fio superior. Ao subir novamente, ela cria um pequeno laço de linha logo abaixo da superfície do tecido. Nesse momento entra em ação uma peça chamada lançadeira ou gancho rotati
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