US 6,655,306 B2 · Thread guide device for sewing machine

Abstract

A thread guide device for a sewing machine comprises thread transfer means 10 and threading means. The thread transfer means 10 includes a thread holding portion 30 capable of holding an upper thread, and the upper thread is held in an upper thread holding position by the thread holding portion 30 and is thus transferred to the vicinity of a lower needle eye. The threading means inserts, into the needle eye, the upper thread transferred to the vicinity of the needle eye by the thread transfer means 10. Moreover, the thread transfer means 10 includes holding pressure changing means (a transfer cam 19, a holding pressure switching roller 46, a holding pressure switching operating plate 40, a holding pressure switching adjusting plate 42, a holding pressure switching link 43, a holding pressure switching plate 44) for changing the holding pressure of the thread holding portion 30 during transfer in which the upper thread is to be transferred from the thread holding position to the vicinity of the needle eye and during return in which the upper thread is to be transferred to the vicinity of the needle eye and the thread holding portion 30 is to be then returned to the thread holding position.

Claims7

Dependent claims

A thread guide device for a sewing machine comprising:

thread transfer means including a thread holding portion capable of holding an upper thread and serving to hold the upper thread in a thread holding position by means of the thread holding portion and to transfer the upper thread to the vicinity of a needle eye;
threading means for inserting, into the needle eye, the upper thread transferred to the vicinity of the needle eye by the thread transfer means;
and
holding pressure changing means for changing a holding pressure of the thread holding portion during transfer in which the upper thread is to be transferred from the thread holding position to the vicinity of the needle eye and during return in which the thread holding portion is to be returned to the thread holding position after the upper thread is transferred to the vicinity of the needle eye.

1 more element

Dependencies are inferred from the claim text.

Thread guide device for sewing machine

Life of this patent

Thread guide device for sewing machine

Life of this patent

Abstract

Claims7