ES450058A1 - Improvements in the devices for the cutting of threads used in sewing machines. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Improvements in the devices for cutting yarns used in sewing machines, said sewing machines being of the type with bobbin, and corresponding "crochet", supported and wrapped by a tubular element, and of the type using needles having a longitudinal groove through which part of the thread of the needle runs freely in the formation with the thread of the needle, when the same needle tends to leave the aforesaid edge, of an eyelet successively hooked by the aforementioned "crochet", characterized by the fact of constituting the device with a first ring -6- associated with said tubular element and coaxial thereto, having a slit -5- through which the thread -4- of the needle -3- and the thread -11- of a bobbin of thread mounted on the bobbin, and also having a circumferential groove or groove -8- originating in said groove -5-; a second ring -13- superimposed on the first ring -6- and coaxial thereto, placed, under command, in rotation oscillating with respect to its own axis, said second ring having part where the slit -5- of the first ring is made -6 -, in which laterally ends a throat -15- that entirely covers the thickness of the ring and whose development is such that it constitutes, with the walls that delimit it, first by a first stretch -15a-, together with the cleft -5 - of the second ring -13-, an entry for the thread -4- of the needle forming the said eyelet and the length of thread -11- of the bobbin arranged between the aforementioned edge and the corresponding coil of thread of the bobbin, and finally a stop for the same strands with respect to a direction of rotation of the second ring -13-, and for a second stretch -15b-, which develops on the opposite side with respect to the first stretch -15a- and in opposite position with respect to said one circumferential groove -8- made in the first ring -6-, a hook for the traction of the above-mentioned threads -4- and -11- towards a fixed cutting means -16- according to the direction of rotation of the second ring opposite to the previous direction of rotation of said ring, presenting said fixed cutting means -16- the blade acting tangentially on the circumferential surface of the second ring -13- opposite the first ring -6- by the action of elastic or mechanical means. (Machine-translation by Google Translate, not legally binding)