US2482919A

US2482919A - Needle for making knitted fabrics

Info

Publication number: US2482919A
Authority: US
Publication date: 1949-09-27
Anticipated expiration: 1966-09-27

Description

MAKI KNI AND REK TING THEM Filed Aug. 20, 1947 p 27, 1949- E. LALANNE ET AL 2,482,919

I NEEDLE FOR TTED FABRICS Hi-rys.

Patented Sept. 27, 1949 NEEDLE FOR MAKING AND REKNITTING-THEM,

Edmond Application V The, object of the invention is characterised by a particular realisation of the functioning .of'oscillating cams of the needles to make knitted fabrics and to re-knitthem. i

Experience has shown'that the contact of the threads on the arts of special shape, actuating thecam, bringsabout dragging or resistances greatly hindering the ease of working of the needles or even going so far as'to break the thread. g I

The inconveniences resulting from'the'eccentricity of the journal with regard to the displacement of the cam, thereby giving rise, by the threads acting on the arms of the different levers, to dragging effects, unbalanced and sometimes opposed. 1 i

It is in order to remedy this state of affairs that there has been produced a cam of a special determined shape assuring a perfect equilibrium of the functioning of the assembly. r

This result is obtained by a cam with a con centric portion called the slide having a radius substantially equal to another portion called the locking portion, which keeps the thread at a tension. Because of this construction the slide portion of the cam can no longer check the movement of oscillation as it no longer undergoes frictional contact. Furthermore, the combined efforts of the threads which were hitherto opposed, in the present device act in the same direction, which permits a greater rapidity of operation, because of a greater suppleness and surety of working.

In the accompanying drawing, given by way of non-limiting example of one of the forms of realisation of the object of the invention:

Figure 1 shows in longitudinal section, rather schematically the needle using the oscillating cam in the open position; Figure 2 shows under the same conditions the oscillating cam in the closed position; Figures 3 and 4 show a constructional var ation according to the same principle; and Figure 5 shows by way of comparison a needle as formerly employed.

The body I of the needle terminates in a hook 2 but possesses a guiding surface with a light retaining boss 3 which permits the thread 4 to exercise a light pressure on the concave surface 5 of the oscillating cam G on the journa1 1 resulting in a displacement bringing the concentric slide surface 8 in line with the retaining boss 3 which is in effect continued thereby permitting the second thread 9, see Fig. 2, to follow its course thereon according to the arrow A.

It is essentially indicated that the arms of the must minus 7 Lalanne'and Pierre Grandj'ean,

I Marseille,France g M Augu t 20,"'1947,1 Serial sweets InFrance June i, 1941 I 5'Claimsi (Cl. 66-117) 2 lever in broken lines referring to the axis 1-0, are constant and no longer have thedifference 'in" length which they had in "theipre ceding needle constructionsj 'It follows, thus that even the contact of the thread on they concentric slide surface 8 can no longer impede the movement of oscillation of thecam, the resultants of the opposing forces compensating each other without conflicting. The 'thread 4 no longer having an abnormal resistance to overcome does not now risk stretchingor even breaking. Its role, which characterises the invention is confined to bringing aboutthe oscillationof thecam. The hook 2 penetratingv into the material passesover the stitches formed by the threads 4, Fig. 1, and 9, Fig. .2. The resultant pull-being exerted on the needle the thread 4' penetrates into theopen'ing situated between the hook 2 and the retaining boss 3 of the body 'I,' Fig. 1, to come finally into contact with the concave surface 5 of the cam, which under'this light blow, oscillates on its journal 1 to the position of Fig.

' 2 and presents a concentric slide surface 8 at a constant radius from the axis, between the hook land the retaining boss 3 in order to guide the second thread 9 above the closed hook.

The rotation of the cam will be effected until the stops l0 and II prevent its revolution, in such a fashion that on the one hand it protects the point of the hook without touching it until the second thread 9 passes over the thread 4 and produces the stitch, while on the other hand it limits the position of the concentric slide surface 8 of the cam receiving the second thread 9, it being stripulated that the threads 4 and 9 form a half stitch.

This cam with a limited automatic movement and the particular function of protecting the point of the hook 2 assures an unequalled solidity and surety of functioning concerning the precision and the robustness.

Its sensitivity and its more reduced angular displacement assures for it an appreciably longer life the wear being negligible because of the compensation of the forces producing its movements. For the concentric sliding part which characterises it, all the forces tend to press the cam towards the base, contrary to that existing at present.

The Figs. 3 and 4 are a variation according to thesame principle. I

The cam is of a semi-circular shape, the stops I0 and II, Fig. 2, being replaced by a single stop l3, which has just stopped the revolution of the 3 cam guided by the groove l4 which limits the amplitude of the movements with the same results as in the preceding example.

Nevertheless, the radius with respect to the centre I of the arms of the lever is constant and the forces. acting, at the. momentof .workare constant and: add accordingi to the direction of the arrows B. C. see Fig. 4. The thread 4 no longer assures by its drag on the cam, the carriage of the thread 9; whereas previously, Fig. 5 by comparison, the force E was opposed to thedragging efiect F and the arms of the lever G' and H'ofidifferent style supported the whole of the effort.

of transport of the thread 4.

The forms, dimensions, and dispositions of the cam and the needle could be varied withoutraltening the general conception of the invention which on said cam to receive a.thread,,a slide surface of constant radius on said cam adjacent the con- 'cave surface. and.- adapted to. extend; outwardlyfrom the needle body beyond. the point of the hook; and retaining means to retain a threadjon.

the needle body adjacent the aperturjng,.the cam being rotatable between twov extreme positions in one off which the concave surface thereon is closed by the end' of thehoo'k and the aperturing of the needle body is cl'osediby the slide. surface of the cam, and in the other of which. the con-.

4 cave surface of the cam is open in the aperturing.

2. Knitting needle for the making and repairing of fabric as claimed in claim 1 wherein the means for retaining a thread comprises a boss on the needle body.

3. Knitting. needle for making and repairing fabric as claimed. in claim 1 wherein the stop means for the cam comprises a pair of stop mem- -.bers on said cam, one of which abuts against the'hook in one extreme position of the cam and the-Jother of. which abuts internally against the needle body in the other extreme position of the 4.. Knitting needle for the making and repairing of fabric as claimed in claim 1 wherein the 'means forretaining a thread comprises a portion of the slide surface of the cam which is arranged-to. extend outwardly from the needle body to form a shoulder against which the thread ensa s 5'. Knitting. needle forthe making and repairing. of. fabric. as claimed in claim 1 wherein the stop means for the cam comprises a stop on the needle body and a slotted hole in the cam. to receive said stop.

EDMOND LALANNE. PIERRE GRANDJEAN.

REFERENCES CITED The following references are. of. record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,775,045 Messing Sept. 2., 1930 1,831,872 Messing Nov. 17.,1931 $012,099 Henderson Aug...20;. 1935: 2,081,515 Trejo May 25,1937- 2,183,716

Gostkowski Dec- 19,. 1-939