US3494119A

US3494119A - Large diameter double twist spindles employed in the textile industry

Info

Publication number: US3494119A
Application number: US767881*A
Authority: US
Inventors: Michele Ratti
Original assignee: Individual
Current assignee: Individual
Priority date: 1967-08-28
Filing date: 1968-08-26
Publication date: 1970-02-10
Anticipated expiration: 1987-02-10
Also published as: CH464749A; DE1760893A1; FR1577064A; NL6810930A

Description

Feb. 10, 1970 M,'R 1'T| LARGE DIAMETER DOUBLE .TWIST SPINDLES EMPLOYED IN THE TEXTILE INDUSTRY Filed Aug. 26, 1968 fivarruu aal Sean-co ATTORNEYS United States Patent 3,494,119 LARGE DIAMETER DOUBLE TWIST SPINDLES EMPLOYED IN THE TEXTILE INDUSTRY Michele Ratti, Luino, Varese, Italy Filed Aug. 26, 1968, Ser'. No. 767,881 Claims priority, application Italy, Aug. 28, 1967,

19,870/67 Int. Cl. D01h 1/10, 7/86 US. Cl. 57-58-84 2 Claims ABSTRACT OF THE DISCLOSURE It is well known that when, on large diameter double twist spindles, the unwinding yarn accidentally breaks, it easily and often occurs that, because of its high rotational speed and the centrifugal force acting upon its broken end, the yarn keeps unwinding from the bobbin placed on the spindle.

A main object of the present invention is to eliminate this drawback.

The improvement to be described and claimed hereinafter is characterized in that the rotating base of the spindle has two annular grooves of dilferent diameters, each provided with a yarn guide element; the yarn, axially passing through the spindle from the upper to the lower end thereof, being made to pass in a substantially radial direction through the yarn guide element of the small diameter groove and successively in a direction substantially parallel to the spindle axis through the yarn guide element of the larger diameter groove; the broken yarn, as a consequence of the air resistance encountered in the section between the two grooves, being made to partially wind up in the small diameter groove so that the unwinding process comes to an end.

The accompanying drawing shows by way of example only a preferred non-limitative embodiment of the improvement according to the present invention.

FIG. 1 is an axially sectioned view of an improved spindle according to the present invention;

FIG. 2 is a cross sectional view of the spindle taken along the plane 2-2 in FIG. 1.

According to the present invention, the rotating base of the spindle is provided with two annular grooves: a small diameter groove 5 placed below a larger diameter groove 1. Each of said grooves is provided with a yarn guide element. Groove 5 has a yarn guide element 6 so placed therein as to direct the yarn in a substantially radial direction while groove 1 has its yarn guide element 4 so placed as to direct the yarn in a direction which is substantially parallel to the spindle axis.

Operation takes place in the following manner: the yarn 3 unwinding from the bobbin 7, axially passing therethrough from the upper to the lower part thereof and coming out from the axial yarn guide element 8, is guided in a substantially radial direction through the yarn 3,494,119 Patented Feb. 10, 1970 guide element 6 of the small diameter groove 5 from which it is made to pass in a direction substantially parallcl to the spindle axis through the yarn guide member 4 of the large diameter groove 1 so that the formation of the so called ballon may start in the region 3 external to the spindle.

Should the yarn break or get torn, the yarn section 3" comprised between the yarn guide element 6 and the yarn guide element 4 (FIG. 2) by encountering a considerable air resistance as a consequence of the high rotational spindle speed, forms a kind of a loop as indicated with dash line in FIG. 2 and finally is wound up in the small diameter groove 5 whereby the unwinding process comes to an end.

Without provision of the small diameter groove 5 the yarn coming out from the yarn guide element 4 would keep on unwinding from the bobbin, thereby not only giving rise to a considerable loss but, above all, interfering with the good development of the work.

Obviously the annular grooves may be placed in any part of the rotating base or they may consist of separate annular elements applied to the rotating base. They may also be of any suitable shape without therefore departing from the spirit of the present invention.

What is claimed is:

1. An improvement to large diameter double twist spindles adapted to prevent the yarn, when it breaks, from keeping unwinding from the bobbin mounted on the spindle as a consequence of the centrifugal force acting thereupon, said improvement comprising a rotating hollow spindle, said spindle having a base, two annular grooves of different diameters on said base, a yarn guide element on each of said diameters, the yarn after passing through said hollow spindle from the upper to the lower end thereof being led in a substantially radial direction through said yarn guide element of the one of said grooves having the small diameter and successively in a direction substantially parallel to the axis of said spindle through said yarn guide element of the other of said grooves having the larger diameter, said broken yarn in consequence of the air resistance encountered in the section between said two grooves being induced to partially wind up in said small diameter groove so that said unwinding action comes to a stop.

2. The improvement as claimed in claim 1, said large diameter groove being located at said base of said rotating spindle corresponding to the starting point for the ballon and said smaller diameter groove being adjacent to said large diameter groove immediately below the latter.

References Cited UNITED STATES PATENTS 2,625,786 1/1953 Klein. 2,715,811 8/1955 Kellogg 57--58.84 2,718,363 9/1955 Roberts.

FOREIGN PATENTS 982,865 2/ 1965 Great Britain.

JOHN PETRAKES, Primary Examiner US. Cl. X.R.