To provide a sewing machine in which a feed dog can be silently changed to a descent position by a feed dog action changing means and the changing of the feed dog to the descent position can be conducted under the necessary minimum under the conditions that a needle thread and a bobbin thread cut.
An up/down feed cam part 17 integrally formed with an eccentric cam part 17a and a concentric cam part 17b is fixed to a lower shaft 20. A cam contact piece 19a of an up/down feed contact piece 19 is able to shift to the eccentric cam part 17a and to the concentric cam part 17b. At a timing of the feed dog 6 in the descent position, a feed dog lowering motor 31 is clockwise rotated. Rotations of a driven gear 36, a leftward shift of a first slide lever 33 through an engagement pin 42 engaging with a screw groove cam 36a, a swing of a swing lever 34 and a rightward shift of a second slide lever 35 shifts the up/down feed contact piece 19 to the concentric cam part 17b through a contact piece shifting member 32, changing the feed dog 6 to an inactive state.
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