Патент USA US2405885код для вставки
Aug- 13, .1946- E. c'. GWALTNEY E'F- AL YARN TENSIONING DEVICE Filed Feb. 15, 1945 2,405,885 Patented Aug. 13, 1946 2,405,885 UNITED STATES PATENT OFFICE‘ 2,405,885 YARN TENSIONING DEVICE Eugene C. Gwaltney, Biddeford, ‘and Henry R. Marsh, Saco, Maine, assignors to Saco-Lowell Shops, Boston, Mass., at corporation-of Maine 1 Application February 15, 1945, Serial 'No. 578,031 I 8 Claims. (Cl. 242-449) This invention relates to devices for applying 2 . t are mounted, the lower plate'having an approxi a tension or drag to a travelling yarn or thread. mately ?at body portion with down-turned or Such devices are commonly used in a consider ?anged ends 3'—‘3', resting on horizontal shoul able variety of textile machinery and the ‘present ders'5—5 atthe opposite ends of the recess. The invention is directed more especially to the re Cl other plate 4 is similar to it but is provided with quirements of those articles of this character in up-turned sides extending longitudinally of it which an exceptionally uniform degree of ten and also with ?anged ends 6 and ‘I. These plates sion must be maintained, and in which also a very accurate adjustment of the degree ofv ten sion is necessary. For example, these requirements are extreme have smooth ?at meeting surfaces. . ly important in twisting machines of the so-oalled “2 for 1” type. In them the yarn is drawn from a supply body, usually stationary, and custom arily is guided through that body along its axis to a ?ier revolving around said axis. From the eye of the ?ier the yarn is fed to a stationary tionary guide eye tends to ‘become excessive and trolling the size of the balloon. The present invention aims to devise a ten sion device which will satisfy these requirements, which can be manufactured economically, will be exceptionally reliable in operation, and which lower end it has a reversely curved section e, can be quickly removed from the machine and taken apart when necessary for any purpose as, for example, to remove accumulations of lint and Fig. 3, which rides in a slot 1‘ formed partly in the lower extension I) of the body 2 and partly in a yarn guiding bushing H3 secured in said ex— tension by a set screw l 1i’. fly. The nature of the invention will be readily un The particular tension device here shown is in tended to ?t into the upper end of the tubular section 8 of the yarn carrier shown in pend derstood from the following description when read in connection with the accompanying draw ing, and the novel features will be particularly pointed out in the appended claims. In the drawing, ing application Ser. No. 495,832, ?led July 23, ' Fig. 1 is a side elevation of a tension device -' in Fig. 1; Fig. 3 is a vertical, axial, sectional view of said device, with some of the parts shown in eleva tion; and Figs. 4 and 5 are transverse, sectional views, considerably enlarged, taken on the lines 6-4 and 5-5, respectively, of Fig. 3. The construction shown in the drawing com prises a tubular body, indicated in general at 2, provided at one side with a recess and having tubular yarn guiding sections, indicated at a and b, respectively, above and below said'recess In said recess lower and upper tension plates 3 and the body 2, and it is clamped there by a set screw in Figs. 2 and 4, and the flattened surface is grooved longitudinally to receive said spring. Be low the shank the spring passes through a radial slot i3, Figs. 8 and 4, formed in a ?anged sec tion 2’ of the body 2, and then through slots in the two end ?anges 6 and ‘l of the upper plate l-l. Between these points the spring is provided with an inwardly bent portion or knee (1 which bears on the upper tension plate 4, and at its a, very accurate control of the tension between the supply body and the flier is essential in con Fig. 2 is a front elevation of the device shown by providing it-with an inturned tip 0, Fig. 3, > at its upper end, which extends into a hole pro vided in the shank or tubular extension at of iii threadedthrough the base of a cap l2 mount ed on the upper end of said shank. This shank also is ?attened on one side, as shown at a’ guide eye, usually located above and in line with said body, and then passes to a wind-up mecha nism. When the ?ier is run at high speeds the balloon formed between the flier and the sta embodying this invention; ’ Pressure is applied to the plates by a spring 8 of the leaf type and which preferably con sists simply of a length of spring wire, suitably bent, as will be described. It is held in place 1943, (now issued as Patent No. 2,374,085) and to take the place of the tension device illus trated in that application. As the yarn is drawn from the supply body surrounding said tubu lar section, it enters the eye g, Fig. 3, of the cap vl2, and travels down through the tubular shank a, through the bore of the yarn guiding bushing H3 at the lower end of said shank, passes between the tension plates 3 and Al, and out through the small bore of the lower yarn guiding bushing M. It will be observed that these bushings l4 and l 55 are in axial alignment with each other and with the yarn tube a and the eye 9. Also, that . this axis is in line with the flat meeting surfaces of the two tension plates 3 and ll. Above the tubular guiding section of the shank a, this mem ber is enlarged somewhat to receive a body of '55 felt 2d, or other ?brous material, which bears 2,405,885 3 4 vice in which those factors controlling the degree lightly on the yarn but with enough pressure to of tension applied to the yarn are capable of very apply a resistance sufficient to straighten out any accurate adjustment. loops or kinks that may be in it. Consequently, At the same time the tension plates can be the yarn travels freely through the entire body of quickly removed for cleaning and replaced. The the tension device except for the very light drag same also is true of the cap 12 and the pre-ten applied to its at 20 and the main resistance to sion device 20 mounted in it. its movement applied by the two tension plates. While we have herein shown and described a The part 26 is really a pre-tension element which preferred emodiment of our invention, it will ensures the straightening of the yarn before it 10 be evident that the invention may be embodied passes between the tension plates 3 and 4. in other forms without departing from the spirit In order to adjust this tension with a high de or scope thereof. gree of accuracy, an annular slide or ringlB en Having thus described our invention, what we desire to claim as new is: which may be tightened up to clamp the spring firmly to the shank. At the side of the ring oppo 15 1. A yarn tension device comprising a support ing body through which the yarn is guided, plates site the set screw a pin I 8 passes radially through supported in said body for pressing the yarn be it and is ?xed in it, the inner projecting end tween them as it passes through said body, a leaf of this pin, as shown in Fig. 3, riding in a groove spring pressing said plates together, said spring formed longitudinally in the shank face a’ where it prevents any rotative movement of the slide 20 extending in a direction generally parallel to said circles the shank a and carries a set screw l1’ plates and means for adjusting the pressure so exerted on the yarn comprising a slide bearing against said spring and mounted on said body for on the shank. Thus the screw l‘! is always held directly over the spring 8 in all positions of ad justment of the slide lengthwise of the spring. Both tension plates are held in place by the spring 3. adjustment lengthwise of the spring. The upper one may be slipped out of 25 its operative position merely by pressing down 2. A yarn tension device comprising a support ing body through which the yarn is guided, plates Wardly on one of its lateral flanges, thus caus supported in said body for pressing the yarn be_ ing it to rotate around the spring 8 and to tip out of place. If, then, the lower plate is lifted tween them as it passes through said body, a leaf spring pressing said plates together, means be lifted out. Both plates may be returned to their operative positions by a reversal of the op and mounted on said body for adjustment length wise of the spring, and means cooperating with said spring to increase the pressure applied to at one corner, it will also tip around the knee d 30 for adjusting the pressure so exerted on the yarn comprising a slide bearing against said spring and swing to one side of the recess where it may erations just described. I , From the foregoing it will be evident that the 35 the spring by the slide itself. 3. A yarn tension device comprising a support active length of the spring 8 utilized in applying ing body through which the yarn is guided, plates pressure to the tension platelil is that between supported in said body for pressing the yarn be the knee d and the set screw ll’. 'Also, that this length can be adjusted accurately by the ar rangement above described, and that the grada tion of pressure can be made very gradual. These are highly desirable results, particularly when the device is used in a twister of the 2 for 1 type. While the slide alone is effective up to a certain degree to adjust the active length of the spring, there is a tendency, when the slide alone is used, for the spring to bow outwardly above the slide, and this action reduces the accuracy of the adjustment. However, when the set screw H is tightened up, it clamps the spring securely to the body, thus increasing very substantially the clamping pressure exerted by the slide itself. This arrangement has been found highly effec tween them as it passes through said body, a leaf 40 spring pressing said plates together, said spring extending in a direction generally parallel to said plates andmeans for adjusting the pressure so exerted on the yarn comprising a slide bearing against said spring and mounted on said body for adjustment lengthwise of the spring, and screw-threaded means cooperating with said slide to clamp the spring to said body in any posi tion of adjustment of said slide. 4. A yarn tension device comprising a support ing body through which the yarn is guided, plates supported in said body for pressing the yarn be tween them as it passes through said body, a leaf spring pressing said plates together, means for adjusting the pressure so exerted on the yarn, tive. ‘ Preferably the intermediate section 2’ of the 55 comprising a slide embracing a portion of said body and disposed transversely thereof but tension body is grooved to receive a soft rubber mounted to slide longitudinally of said body, and bushing 2i, somewhat larger in outside diameter a device carried by said slide and riding on said than the other parts of said body, so that it en spring and adjustable relatively thereto to clamp gages the inner surface' of the central tubular member 8 of the carrier shown in the patent 60 the spring against said body. 5. A yarn tension device comprising a support above referred to and provides a yielding contact ing body through which the yarnv is guided, plates with the bore of said member. This bushing has supported in said body for pressing the yarn be been omitted from Figs. 4 and 5. tween them as it passes through said body, a leaf Preferably, also, the upper adjacent surfaces of the plates are slightly bevelled or grooved to 65 spring pressing said plates together, means for form a short funnel section, as indicated at h adjusting the pressure so exerted on the yarn, in Fig. 5, to assist in guiding the wire customarily used in threading up the tension device. The capl2 may be made of any convenient body and disposed transversely thereof but mounted to slide longitudinally of said body, and comprising a slide embracing a portion of said material such, for example, as one of the molded 70 a set screw threaded into a portion of said slide and positioned to bear on said spring, said screw plastics, and it is releasably secured on the body being adjustable to clamp the spring against said 2 by the set screw I ll. body. Fromv the foregoing it will be evident that the _6. A yarn tension device comprising a support invention provides a very simple and compact, but rugged and substantial, form of tension de 75 ing body provided ‘with a'lateral- open-sided re 5 2,405,885 6 cess and with a tubular yarn guiding shank, two opposed plates mounted in said recess to grip the yarn between them as it travels through said body, a leaf spring having a portion extending along said shank and another portion bearing on one of said plates to press them together, and ing body provided with a lateral open-sided re a slide mounted on said shank to engage said spring mounted at one end on said shank and hav spring and adjustable to vary the length of said cess and with a tubular yarn guiding shank, two opposed plates mounted in said recess to grip the yarn between them as it travels through said body, said plates having ?at, smooth-meeting surfaces and oppositely directed ?anges, a leaf ing a free portion extending along said shank and spring e?ective to apply pressure to said yarn. overlying said plates, said spring having a knee '7. A yarn tension device according to preced 10 bearing on one of said plates to press it against ing claim 6, in which said slide carries a set the other, and a slide encircling a portion of said screw to bear on said spring, and means cooper~ ating with said slide to guide it during its adjust ing movement to maintain said set screw in posi tion to bear on said spring at any point in its range of adjustment. 8. A yarn tension device comprising a support shank and overlying said spring, whereby the slide is adjustable to vary the length of said spring effective to press said plates together. EUGENE C. GWALTNEY. HENRY R. MARSH.