Needle threading device for sewing machine and sewing machine

摘要

A needle threading device of a sewing machine comprising a needle threading shaft mounted rotatably and vertically movably; a needle threading hook fixed to a lower end of the needle threading shaft; and a rotating mechanism that rotates the needle threading shaft such that the needle threading hook passes through a needle eye of the sewing needle. In such a needle threading device, a first thread guide member is fixed to a lower end of the needle threading shaft and arranged opposed to the needle threading hook with respect to the needle threading shaft; a second thread guide member is pivotally mounted on the lower end of the needle threading shaft and linked to the first thread guide member via a link mechanism. Upon rotation of the needle threading shaft, the upper thread is retained in a predetermined position near the needle eye in cooperation with the second thread guide member and the first thread guide member. The second thread guide member is mounted with a thread retaining unit that retains the upper thread upon needle hooking.