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Abstract

The present invention relates to an embroidery machine thread tension adjusting device. An embroidery machine thread tension adjusting device according to an embodiment of the present invention is provided for an embroidery machine comprising a needle bar, a thread take-up unit, a hook, and an embroidery frame, and is configured to adjust the tension of an upper thread withdrawn from a spool and supplied to a needle of the needle bar through the thread take-up unit. The embroidery machine thread tension adjusting device comprises: a thread pulling adjusting unit comprising a thread take-up lever disposed along a path of movement of the upper thread withdrawn from the spool and supplied to the needle so as to control the amount of pulling of the upper thread when rotating while maintaining contact with the upper thread, and a first actuator for providing the thread take-up lever with rotational driving power; at least one thread guide adjusting unit comprising a pair of thread guide units disposed on at least one of the front and rear ends of the thread pulling adjusting unit along the path of movement of the upper thread such that, when the upper thread passes, same are forced against each other while maintaining contact with the upper thread, thereby controlling frictional force of the upper thread, and a second actuator for providing the pair of thread guide units with driving power; and a controller for determining the status of driving of at least one of the needle bar, the needle take-up unit, the hook, and the embroidery frame according to each of multiple pieces of stitch information included in embroidery data, and controlling the driving of at least one of the first actuator and the second actuator provided in each of the at least one thread guide adjusting unit according to the result of determination, thereby adjusting at least one of the amount of pulling of the thread take-up lever and the frictional force of the upper thread supplied between the pair of thread guide units provided in each of the at least one thread guide adjusting unit.

First Claim