Method for controlling sewing operating of a sewing machine
AssigneeZeng Hsing Industrial Co., Ltd.
InventorJung-Nan Tsai
Life of this patent
Estimating the term…
Abstract
In a method for controlling sewing operation of a sewing machine, a stitch needle completes an in-and-out movement on a fabric with a first tension applied to an upper thread when the stitch needle, with respect to a fabric-feeding mechanism, is at a first relative position corresponding to a first pattern part of a predetermined stitch pattern. Afterward, the stitch needle is moved, with respect to the fabric-feeding mechanism, to a second relative position corresponding to a second pattern part of the predetermined stitch pattern, and completes an in-and-out movement on the fabric at the second relative position with a second tension, which is greater than the first tension, applied to the upper thread.
Claims8
A method for controlling sewing operation of a sewing machine, the sewing machine including a stitching unit, a control unit and a thread tension controller, the stitching unit including a stitch needle that carries an upper thread and a fabric-feeding mechanism that is configured to feed a fabric in a general feeding direction, the sewing machine being configured to sew a predetermined stitch pattern on the fabric, the predetermined stitch pattern having a first pattern part and a second pattern part which are opposite to each other in a direction transverse to the general feeding direction, the method comprising the following steps in the given order:
- a) driving, by the control unit, the stitch needle to complete an in-and-out movement on the fabric with a first tension applied by the thread tension controller to the upper thread when the stitch needle is with respect to the fabric-feeding mechanism at a first relative position corresponding to the first pattern part of the predetermined stitch pattern;
- b) after the in-and-out movement, driving, by the control unit, the stitching unit to change relative position of the stitch needle with respect to the fabric-feeding mechanism from the first relative position to a second relative position corresponding to the second pattern part of the predetermined stitch pattern, and adjusting, by the thread tension controller, tension force applied to the upper thread to a second tension that is greater than the first tension;
- and
- c) driving, by the control unit, the stitch needle to complete an in-and-out movement on the fabric at the second relative position with the second tension.
Dependencies are inferred from the claim text.