Sewing machine

Abstract

The invention provides a sewing machine which can well perform sewing along a curved line. The sewing machine comprises a first feeding mechanism (30), a second feeding mechanism (50), a control device (90) and a side end detection part (17). The first feeding mechanism is arranged to be adjacent to a sewing position, and feeds to-be-sewn object through a roller which is configured to be in an oblique state. The second feeding mechanism is configured to be on the upstream side in the feeding direction relative to the first feeding mechanism, comprises a feeding body (51) which is in contact with the to-be-sewn object in a position deviating from a rotation center, and feeds the to-be-sewn object along an arc around the rotation center. The control device controls a driving source (33) of the first feeding mechanism and a driving source (53) of the second feeding mechanism. The side end detection part is in the direction intersecting the feeding direction of the to-be-sewn object in the sewing position, and detects the position of the side end part of the to-be-sewn object. The control device and the position, which is detected by the side end detection part, of the side end part of the to-be-sewn object correspondingly control the rotation speed of the driving source of the second feeding mechanism.

Description

technical field [0001] The present invention relates to a sewing machine suitable for sewing along curves. Background technique [0002] For example, when sewing a to-be-sewn object along a curve, currently, the operator presses the to-be-sewn object with his left hand, slides his right hand, and rotates around the left hand. [0003] In the case of this sewing, in order to sew along the locus of the target curve, skilled skills are required, and there is a problem that only skilled workers can sew. [0004] In view of the above problems, there has been proposed a sewing machine including a roller feed unit that cooperates with the feed teeth to feed a to-be-sewn object at a position adjacent to the needle drop position. [0005] In this sewing machine, the rotation axis of the roller in the roller feeding section is inclined relative to the horizontal direction, and the roller is rotationally driven by a motor, so that the object to be sewn can be conveyed along the arc sh...

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned conventional sewing machine provided with the roller feeding part has the following problem because it feeds adjacent to the needle drop position, that is, it is easy to turn around the needle drop position, and the stitches are sewn. The direction of travel of the object tends to swing to the left or right, making it difficult to sew along the desired curve

[0008] In addition, the above-mentioned existing sewing machine equipped with a roller feeding part can transport the sewn object along a curve with a fixed curvature, but it cannot cope with changes in the curvature of the curve. Avoid the influence caused by poor skills of operators

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