US2826892A - Repair and replacement cap for twisting machine heads - Google Patents

Description

March 18, 1958 w. c. GUSTAFSON 2,826,392

REPAIR AND REPLACEMENT CAP FOR TWISTING MACHINE HEADS Filed March 22, 1954 'INVENTOR WALTER c. GUSTAFSQN v .ATTORNEY United States REPAIR AND REPLACEMENT CAP i on TWISTING MACHINE HEADS Walter C. Gustafson, Paxton, Mass. Application March 22, 1954, Serial No. 417,904

1 Claim. (Cl. 5777.3)

This invention relates to a new and improved repair and replacement cap for twisting machines having specific applicability to the twisting pins which in the conventional twisting head become worn and grooved, and also the rim of the thread passage through the usual spindle which also becomes worn and grooved.

It is the principal object of the present invention to provide an easily applicable repair cap for twisting machine heads, said cap comprising a disc-like body having a central opening therein receiving and holding a hardened yarn guiding ring, and there being a pair of hardened yarn-guiding and twisting pins located diametrically opposite each other and extending from said body in a direction opposite to a flange on the rim thereof whereby the worn pins on the twister head may be ground off and the new cap applied thereto as by a press fit, with the twister head receiving the flange.

Further objects of the invention include the Provision of a repair cap as above described wherein the inserted ring and the pins are made of tungsten carbide and will act to twist the yarn for a period of time three or four times greater than that of the original equipment.

Other objects of the invention include the provision of a repair cap as above described which enables the mill operator to quickly and easily repair his own twister heads without the necessity of sending the spindles out of the plant to a repair shop, thereby greatly saving expense and time as well as providing a greatly improved machine.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which:

Fig. l is a view in elevation of a conventional twisting head;

Fig. 2 is a section showing the novel repair cap in place;

Fig. 3 is an enlarged view in elevation of the novel repair cap;

Fig. 4 is a top plan view thereof;

Fig. 5 is a bottom view;

Fig. 6 is an enlarged section through the cap;

Fig. 7 is a sectional view through a modified construction;

Fig. 8 is a section on line 8-8 of Fig. 7;

Fig. 9 is a section through a twisting head showing an application of the modified construction; and

Fig. 10 is a top plan view, looking in the direction of arrow 10 in Fig. 9.

The conventional twisting head for twisting a loose roving or the like into a yarn or thread includes a spindle 10 rapidly rotated on its axis as by a pulley or whirl 12, and the spindle is provided with a longitudinal central passage 14 for the downward travel of the yarn or thread 16.

The upper end of the spindle is provided with a pair of short longitudinally extending eccentrically mounted pins 18 located the same distance from the axis of the spindle diametrically opposite each other. These pins are rounded at their free ends which engage the roving ice 2 20 and give it a slight bump at each revolution. The roving or the like 20 is fed in at the angle shown so that the pins cannot become entangled or the roving wound up on the pins.

These pins and also the edge of the rim of the opening at the entrance end of the thread passage 14 become worn and grooved by the passage of the material, and of course once grooved, these parts are useless for their intended purpose. Prior to the present invention, the mill operator removed the spindles from the machines and sent them back to the factory for repair and overhaul, or else expensive machine operations had to be done at the mill operators plant, changing the outside diameter and the inside diameter of the twister in order to accommodate prior art supplementary devices and to repair the head. This invention, however, obviates the necessity for expensive and time-consuming milling and grinding operations and also the necessity for returning the spindles to the factory in the event that the mill operator was not equipped to machine his own spindles for repair.

The present invention is a cap comprising a generally circular flat disc-like body or top wall 22 having a depending annular flange 24 at the rim thereof. The lower edge of the flange 24 is inwardly bevelled to facilitate positioning of the cap on the twisting head. This body has a central aperture 26 with an inwardly-directed annular shoulder 28 at the lower edge thereof receiving and holding a tungsten carbide ring 30. This ring is rounded over at its inner aspect, providing a smooth, hard convex guide surface for the thread or yarn, not heretofore available on the twisting head. The material of the body 22 can be peened over at 32 to hold the ring, or it may be press-fitted, shrunk on, etc.

The cap also has a pair of tungsten carbide pins 34 set in holes in the body 22, equi-distant from the axis of the cap and diametrically oppositely located. These pins are rounded at their free ends 36 and act in place of pins K when the latter are removed as by grinding them off, and the novel cap is set in place by cementing, shrinking, or press fit in the ordinary case where the original spindles have been held to specified tolerance.

Figs. 7, 8 and 9 illustrate a modified form of the invention. The reference numeral 38 indicates a spindle similar to that at 10 but in this case instead of being provided with pins 18, it is provided with cross slots or diametrically opposed channels 40 which intersect a conical end depression 42, and in this case the yarn comes in at an angle greater than that shown in Fig. 1, see Fig. 7.

This invention contemplates a cap similar to that described above but provided with the channels 44 which are like those at 40 of the original spindle and intersect a conical formation 46 which is similar to that at 42. In this case also, the new cap has a depending skirt for fitting the end of the spindle 38 and it is provided with the inserted tungsten carbide ring 48 which takes the wear of the yarn as clearly shown in Fig. 8.

The cap of Figs. 7 and 8 may be applied to the spindle 38 without any machine operations at all as is indicated in these figures, but if desired, the end of the spindle 38 may be cut off as shown in Fig. 9 at 50 or it may be cut or ground off to the degree found necessary for providing a good basis of support for the new cap.

Furthermore, the cap of Figs. 1 to 6 may be applied to the spindle 38 and the cap of Figs. 7 and 9 may be applied to the spindle 1 0, so that the devices are made completely interchangeable.

The new cap will outwear the old pins by three or four times, and the inserted ring Will last as well. The mill operator does not have to send the worn spindle out for repair, but at less expense and in far quicker time, he can use the new cap which may be placed on the spindle in a Patented Mar. 18, 1958' his 'own shopjand thus obtain a better twister head than the-- originalt Having thus describedmy invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise thanas-- setfortli-in'the'claim, butwhat I claimis:

A-deviee for repairing'a cylindrical twisting-machine head provided at the top thereof with wornupstanding pins which have been severed prior to-repair flush with thetop-end ofthe head and also provided withan axial bore, said device comprising a capof relatively soft material positioned on theupper-end portion of said head, said cap including a top wall abuttingthe top end of the head and adependingannular flange-frictionally embracing the side-wall of the head; the lower edgeof saidflange being inwardly bevelled tofacilitate positioning of said cap on said head, the top wall of the cap being provided with a central aperture and with an inwardly projecting annularshoulder at thebottom of said'aperture, a ring of relatively hard material mounted in said aperture on said shoulder and having an inside diameter' corresp'onding substantially tothe diameter of the bore-in said head,

a portion of said top wall at the top of said aperture being 'peened' inwardly over said ringto retainthe same References Cited in the file of this patent UNITED- STATES PATENTS 652,306 Weber June 26, 1900 1,774,371 Hendrickson et a1. Aug. 26, 1930 2,291,819" McCann Aug. 4; 1942 2,557,591 Benson June 19, 1951 2,571,109 Carter Oct. 16, 1951 2,740,251 Bierlin Apr. 3, 1956 2,753,679 Von Schmoller et al July 10, 1956 FGREIGN PATENTS 440,546 Italy Oct. 13, 1948 552,131 Great Britain -4 Mar. 24,1943

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