US2720075A - Bobbin adaptor - Google Patents

Description

Oct. 11, 1955 1 K COCHRAN 2,720,075

BOBBIN ADAPTOR Filed Sept. lO, 1951 United States Patent O 2,120,015 BoBlN `ADAProR John K. Cochran, Conyngham, Pa., assigner to The Duplan Corporation, Hazleton, Pa., a corporation of Delaware Application September 10, 1951, Serial No. 245,795

4 Claims. (Cl. 57-130) This invention relates to a bobbin adaptor assembly for the use of a straight bore bobbin with straight and tapered blade spindles in textile spinning.

This application is a continuation-impart of my application Serial No. 181,071, led August 23, 1950, and now abandoned, for a Bobbin Adaptor Assembly for Tapered Blade Spindles.

ln spinning operations bobbins are placed on spindles and several bobbins per spindle are used. It is apparent that the internal structure of the bobbin permitting it to be mounted on a spindle becomes an appreciable cost of the spinning operation.

It is accordingly a fundamental object of the instant invention to provide adaptors which will fit the spindles and receive straight bore bobbins for use therewith.

It is a fundamental object of the instant invention to provide a bobbin adaptor which will fit spindles with sufficient accuracy to meet the requirements of high speed operation.

Other objects and advantages of the invention will in part be obvious and in part appear hereinafter.

The invention is embodied in an adaptor for use in combination with tapered and straight blade spindles and straight bore bobbins, the adaptor being characterized as essentially a cylindrical body having a centrally-located hole to receive a spindle blade, the adaptor also carrying longitudinally-spaced transverse grooves intercepting the diameter, the cross section of the adaptor at the several locations of the slots being such that its bending strength at those points is less than that of the spindle blade at corresponding points. The adaptor is made of a deformable material to permit the correction of minor errors of alignment of the hole in making the adaptor.

In the drawing accompanying the instant specification, Fig. 1 is a longitudinal section through a bobbin adaptor assembly mounted on a spindle.

Fig. 2 is a side elevation of the adapter shown in Fig. l.

Fig. 3 is a section through the adaptor taken at line 3-3 to illustrate the placement of a groove.

Fig. 4 similarly is a section through the adaptor at line 4-4.

Fig. 5 is a side elevation of a bottom assembly for the adaptor as it is applied to the spindle.

Fig. 6 is a section through the bobbin assembly at the line 6 6 of Fig. 5.

Referring to Fig. l, a spindle comprises a whorl 10 which represents the portion for application of a driving belt and a blade portion 11 over which the bobbin is placed. The base unit 12 of the adaptor lits closely on or about the spindle and is formed with an outer upturned flange 13 and an inner elongated collar 14 surrounded by a second collar 15 formed to create a small annular space 16 therebetween. The adaptor 17, in this embodiment, is formed with a central longitudinal tapered hole corresponding in form to the tapered spindle 2,720,075 Patented Oct. 11, 1955 ICC and has straight exterior sides to receive the straightsided bobbin 18.

At spaced intervals along the axis of the adaptor on either side of its midpoint, grooves 19, 20, 21 and 22 are placed substantially normal to the axis to provide exibility and deformability so that in the completed adaptor the spindle blade 11 may hold a truly axial path and give a symmetrically mounted piece. It will be noted that the grooves pass into the body of the adaptor to a depth which leaves the innermost chord thereof placed between the center of the adaptorI and the outer circumference. In general, the chord defining the connecting section of the adaptor may be approximately midway between the outer or circumferential surface and the center of the unit.

In the structure a pair of such grooves 19 and 20 is placed near the lower heavy portion of the spindle at a level slightly below the midpoint of the bobbin and a second pair is placed slightly above the midpoint. The annular groove 16 in the base 12 is provided to permit minor deformation of the bobbin as hereinafter explained.

Details of construction of the base may be seen in Figs. 5 and 6, and of the adaptor in Fig. 2.

Since the objective of providing the slots in the bobbin adaptor and base is to permit the spindle blade to hold its straight axial form, materials which are slightly deformable under stress are most favored for use. Thus, the bobbin adaptor itself is preferably formed of a molded Bakelite composition and the base bushing is formed of rubber.

As noted, the adaptor is made of a slightly deformable material because it is practically impossible to form the central axial hole accurately or to mold it in place with the desired degree of precision. The core pin used is the same size as the spindle blade. In the molding it becomes distorted. lf it were made large enough to hold true, larger spindle blades would be required.

The inaccuracies created in molding produce an unsymmetrical adaptor, which, in operation, creates a condition of unbalance in the machine and great precautions must be taken in rebalancing such a machine for industrial operations. Any slight shift of the adaptor with relation to the blade also produces conditions of unbalance. By making the adaptor in the form described, that is, placing slots transversely therein, I have found it is possible to have the spindle blade correct the minor inaccuracies in the alignment of the hole. Accordingly, the method of forming the adaptor comprises molding or machining the body thereof with a hole. of the size of the spindle blade and then placing the transverse slots 19, 20, 21 and 22 at the location desired. The conditions created by the placement of the transverse slots permit the spindle blade to hold its straight form without being deflected appreciably.

When the adaptor is made in the form described I have found that the strength of the adaptor has been reduced so that its resistance to the blade is sufficient to permit the blade to remain true on a straight axial path. Thus the adaptor may be balanced and mounted on a balanced blade to give an assembled unit which will operate accurately in balance. Accordingly the principal condition it is desired to create in placing the slots in the adaptor is to reduce the strength of the cross section of the adaptor remaining to a level below that which will produce appreciable bending of the spindle blade when the adaptor is set in place.

Having described the invention with only a single embodiment, it is to be understood that the preceding specification is intended to be illustrative and not as a limitation of the invention, and that variations of the invenspindle `having a blade, a resilient adaptor tted to said' blade, said adaptor having a bore matching the outer surface of the spindle blade and a cylindrical outer surface, said adaptor having a plurality of slots therein, longitudinally spacedI and oriented transversely and substantially normal to the axis thereof, said slots penetratingthe adaptor to a depth which leaves the cross section of the adaptor with a bending strength less than that of the cross section of the spindle blade at the corresponding point.

`2. lA structure in accordance with claim 1 in which said'adaptor i's tted to a tapered' blade spindle.

-3.A structure in accordance with claim 1 in which the said slots are longitudinally symmetrically placed with respect to the midpoint of the bobbin placed there- 4.".In a spinning machine, in combination, a spindle having a blade, an adaptor fitted on said blade, said adaptor having a bore matching the outer surface of the spindle blade, and having a cylindrical outer surfaces, said adaptor having a plurality of slots therein longitudinally spaced and oriented transversely and substantially normal to the axis thereof, a base bushing formed References Cited in the file of this patent UNITEDv STATES PATENTS 190,525 Taft May 8, 1877 525,468 Northrop Sept. 4, 1894 784,929 Draper Mar. 14, 1905 1,716,784 Lawson June 11, 1929 1,957,860 Stone May 8, 1934 2,249,735 Abbott et al. July 22, 1941 2,320,965 Cotchett et a1. c June 1, 1943 2,346,075 Mihalyi Apr. 4, 1944 2,414,054 McDermott Jan. 7, 1947 2,417,525 Smith Mar. 18, 1947 2,510,292 Pierce June 6, 1950 2,626,811y Hohwart Jan. 27, 1953 FOREIGN PATENTS 23,988 Switzerland 5 May 30, 1901 1939 506,135 Great Britain 2 May 23,

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