Abstract: Provided is a presser foot system for sewing machine comprising a small tubular cylinder bed which is used, for example, in joining crotch sewing of underpants or drawers and joining shoulder sewing of shirts. Distance from the center of a needle location to the cutting starting position of a knife trimming mechanism, wherein the upper edges of the ends of fabrics in a vertical face-to-face contact to be fed to a guide path are cut to an even length, is set to the range of 16.5 mm to 18.0 mm in actual dimension. This range is sufficient so that the ends thus cut by one operation of the knife trimming mechanism are stacked one on another by the operation of guide of upper and lower guides until these reach the needle location. Thus, irrespective of the thickness and flexibility of the fabric material and the presence or absence of a step, the ends of the fabrics cut to the even length can be fed in a predetermined stacked state to the needle location, thereby ensuring high quality finish of sewing.

Abstract: A thick fabric of poor surface smoothness, such as a fabric for wet suit, can be fed reliably, smoothly and uniformly to perform sewing of excellent finish, without requiring any oil application to the fabric surface before sewing, by arranging a presser foot body, a small presser foot and a roller as follows. The presser foot body is fixedly supported to a lower end portion of a presser bar supported to a sewing arm part so that it is free to move vertically and reciprocally. The small presser foot resiliently pressing the fabric to the upper surface side of a throat plate is disposed on the downstream side than a needle location hole of the presser foot body in the sewing direction. The roller is disposed on the upstream side than the needle location hole in the sewing direction and is rotatable such that its contact portion with the fabric is successively changed with the fabric feed.

Abstract: A thick fabric of poor surface smoothness, such as a fabric for wet suit, can be fed reliably, smoothly and uniformly to perform sewing of excellent finish, without requiring any oil application to the fabric surface before sewing, by arranging a presser foot body, a small presser foot and a roller as follows. The presser foot body is fixedly supported to a lower end portion of a presser bar supported to a sewing arm part so that it is free to move vertically and reciprocally. The small presser foot resiliently pressing the fabric to the upper surface side of a throat plate is disposed on the downstream side than a needle location hole of the presser foot body in the sewing direction. The roller is disposed on the upstream side than the needle location hole in the sewing direction and is rotatable such that its contact portion with the fabric is successively changed with the fabric feed.

Abstract: The invention provides a sewing machine with uncurling device comprising a separating plate and a suction tube, the separating plate is placed in front of the needle drop point and it separates upper and lower fabrics fed to a needle drop point with their respective edge hems overlapped, and the suction tube has an air-intake with its size covering across upper and lower surfaces of the separating plate and it straightens curls at separated edge hems of the both fabrics by air flow sucked into the suction tube through the air-intake. As the overlapped edge hems of the both fabrics are fed into the needle drop point, the curls at the edge hems are reliably straightened regardless of the shape thereof. Therefore, it eliminates troublesome manual labor for straightening the curls before feeding of the fabrics.