SEWING MACHINE

摘要

A sewing machine, in which a presser foot and a throat plate are detachable, includes a feed dog bracket, a feeding dog and a mounting portion. The feed dog bracket is driven according to a transfer direction of a fabric. The feeding dog transfers the fabric on the throat plate. The mounting portion detachably mounts the feeding dog on the feed dog bracket. The feeding dog includes a cam portion which is mounted on the mounting portion. The cam portion includes first, second and third cam surfaces. The first cam surface has a surface-contact with a first receiving surface of the mounting portion. The second cam surface has a line-contact with an end portion of a second receiving surface of the mounting portion. The third cam surface is pressed by a pressing member of the mounting portion.

主权项

1. A sewing machine in which a presser foot and a throat plate are detachable in accordance with a stitch pattern, the sewing machine comprising:
a feed dog bracket that is driven according to a transfer direction in which a fabric is transferred; a feeding dog that transfers the fabric on the throat plate; and a mounting portion that detachably mounts the feeding dog on the feed dog bracket, wherein the feeding dog includes a cam portion which is mounted on the mounting portion, and wherein the mounting portion includes:
a first receiving surface and a second receiving surface on which the cam portion is inserted and which are formed in positions opposing to each other; anda pressing member which presses the inserted cam portion which is inserted between the first and second receiving surfaces, in an insertion direction, and wherein the cam portion includes:
a first cam surface which is a planar surface and which has a surface-contact with the planar first receiving surface;a second cam surface which has a line-contact with an end portion of the second receiving surface in a direction perpendicular to the insertion direction in which the cam portion is inserted; anda third cam surface which is pressed by the pressing member.