US2881988A - Yarn tensioning device - Google Patents

Description

April 14, 1959 J. WARWICK YARN'TENSIONING DEVICE Filed June 12, 1956 INVENTOR John WarwcK ATTORNEY United vStates Patent D YARN `TENSIONLNG DEVICE John "Warwick, Livingston, NJ., assignor to Specialties Development Corporation, Belleville, NJ., a corporation of New yJersey Application June 12, 1956, Serial No. 590,875

3 Claims. (Cl. 242-150) The present invention relates to yarn tensioning devices, and, more particularly, to disc type yarn tensioning devices which are suitable for tensioning spun yarns as well as other types of yarn.

Heretofore, Ythe continuous operation of devices for tensioning spun yarns, particularly cotton moving-athigh speed therethrough, has been accompanied by considerable difficulty in that -slivers, lintor other particles were detached from the yarn and accumulated between the tensioning -vdiscs. Such `accumulations eventually wedged the discs apart, resulting in the complete loss of the tension imparted to the yarn or the control of such tension. As a consequence, much operating time was lost duc to shut downs for inspection or cleaning of the tension devices.

Accordingly, an object of the present invention is to overcome the foregoing disadvantages by providing a disc type tensioning device adapted to expel yarn slivers or lint and the like, whereby shut downs for inspection or cleaning are eliminated and no operating time is lost.

Another object is to accomplish the foregoing by means of elements which are readily installed in existing disc type tensioning devices to render the same suitable for tensioning spun yarns as well as other types of yarns.

A further object is to accomplish the foregoing in a simple, practical and economical manner.

Other and further objects of the invention will be obvious upon an understanding of the illustrative embodiment about to be described, or will be indicated in the appended claims, and various advantages not referred to herein will occur to one skilled in the art upon employment of the invention in practice.

In accordance with the present invention, the foregoing objects are generally accomplished by providing a yarn tensioning device having a pair of discs in contact along an annular zone for receiving yarn therebetween, means such as a polished spindle, a post and a thrust bearing for mounting one of the discs for free axial rotation by the yarn, the rotatable disc having a central aperture formed with openings or recesses located radially inward of the contact zone for receiving slivers, lint or other particles detached from the yarn and for discharging the same to prevent accumulations between the discs.

A preferred embodiment of the invention has been chosen for purposes of illustration and description, and is shown in the accompanying drawing, forming a part of the specification, wherein:

Fig. l is a fragmentary elevational view of a yarn tensioning device in accordance with the present invention.

Fig. 2 is a sectional view taken along the line 2--2 on Fig. l illustrating the discs and the mounting means therefor.

Fig. 3 is a sectional view taken along the line 3--3 on Fig. l showing the conguration of the rotatably mounted disc in accordance with the present invention.

Referring to the drawing in detail, there is shown, by way of example, a yarn tensioning device of the compensating type which comprises an upper disc 10, a pres- 'ice sure system 11 for the upperdisc, a lowerdisc 12, and a lower mounting means `14 for the' lower disc.

The upper disc 10 preferably is chromium platedVhas a smooth contour, and isprovided with a highly polished annular zone `15 and a central, inverted cup-shaped formation 13. The pressure-system 11 bears on the top of the formation 13 to maintain the underside` of the-formation in contact with a lpin or vrod 16 which is actuated to compensate for changes in tension by a compensating bar 17 .adapted to be controlled in the manner disclosed in United States Letters Patent No. 2,629,561. Lateral alignment of the .upper disc is maintained by loosely positioningthe formation l13 over a sleeve 19 which is part of themountng means 14.

The lower disc 12, as shown in Fig. 3, is generallycircular and has a central aperture 20 through which the sleeve 19 extends to rotatably mount the lower disc. One or more recesses 21 extend radially outward from the central aperture and one or more recesses 24 vextend radially inward from the outer periphery 22 for Vthe purpose hereinafteridescribed. As illustrated herein, a plurality of circumferentially, preferably equidistantly, spacedrecesses 21 and V24 areprovided.

As y-shown in Fig. 2, the lower disc 12 is generally concavo-convex in cross section and has a raised annular section 25 adapted to abut the annular zone 15 of the upper disc 10 to provide an annular contact zone for the discs located between the inner and youter recesses 21 and 24. The section 25 of the lower disc is chromium plated and is highly polished to minimize friction tending to oppose relative rotation of the discs 10 and 12.

In order to further arrange the lower disc for free rotation about its axis and with respect to the upper disc, the mounting means 14 includes a stud 26 which is fixed t0 the frame 27 of the device, has a bore for slidably mounting the rod 16, and is further provided with a shoulder 29 for supporting a thrust bearing 30. A support 31 carries a resilient ring 32 which is in frictional engagement with the outer periphery of the lower disc 12 to rotate therewith. The support has a stepped bore 34 adapted to fit over the stud 26 and shoulder 29 thereof and to bear against the thrust bearing 30, and has a central upwardly projecting tubular portion 35 over which the sleeve 19 is disposed in close tting relationship. The upper surface of the support 31 has a radially outwardly and downwardly inclined annular portion 36 between the sleeve 19 and the ring 32 adapted to serve the purpose about to be described.

In operation, a strand of yarn Y, inserted between the discs 10 and 12, is maintained in a centrally offset position by contacting the sleeve 19 and passes through the annular zone of contact of the discs. As the yarn is drawn between the discs at a rapid lineal speed, it transmits a driving torque to rotate or whirl the lower disc together with the support 31 at high speeds.

Particles which are detached from the yarn in passing between the discs enter the cavity defined by the sleeve 19, the upper disc 10 and the lower disc 12 but are maintained in a state of agitation by the rotation of the lower disc to facilitate entering the inner apertures or recesses 21 and being deposited on the inclined portion 36. Due to the rotation of the lower disc and its support, particles so deposited are directed outwardly by centrifugal force and are discharged through the recesses 24.

The discs 10 and 12 have been shown in a horizontal position to illustrate the most adverse condition under which the device may be operated to create a lint or sliver accumulation problem. However, it will be appreciated that lint and sliver removal from between the discs is also facilitated should the discs be disposed in a vertical position orin an inclined position between the horizontal and vertical positions.

While the means for preventing accumulations of lint or slivers have been illustrated and described in connection withk a yarn tensioning device of the compensating ltype, it will be apparent that such means are equally applicable to devices which merely have a xed adjustment for causing the discs to tension the yarn.

Also, it will be apparent that existing tension devices can be provided with such means by embodying therein a disc 12 and a freely rotatable support for the disc such as disclosed herein.

From the foregoing description, it will, be seen that the present invention provides a simple and practical manner of preventing sliver or lint accumulations in yarn tensioning devices to thereby save'valuable ytime otherwise lost in inspecting and cleaning such devices.

As various changes may be made in the form, construction and arrangement of the parts herein, without departing from the spirit and scope of the invention and without sacrificing any of its advantages, it is to be understood that all matter herein is to be interpreted as illustrative and not in any limiting sense.

I claim:

1. A yarn tensioning device comprising a pair of discs in contact along an annular zone for receiving yarn therebetween, and means for rotatably mounting one of said discs for free rotation about its central axis by the yarn, said rotatably mounted disc being generally concavo-convex in cross section and having a central aperture formed with recess means located inward of the contact zone and having recess means at its outer periphery, said mounting means including a support for said rotatably mounted disc having an annular surface between the inner and outer recess means and including means for mounting the support for free rotation, whereby particles detached from the yarn will enter said rst mentioned recess means, move radially outwardly on said surface and be discharged through said second mentioned recess means.

2. A device according to claim 1, wherein said surface has a downwardly and outwardly inclined annular zone for directing particles towards said second mentioned recess means.

3. A device according to claim l, wherein said surface has an annular zone for frictionally engaging the outer periphery of said rotatably mounted disc.

References Cited in the le of this patent UNITED STATES PATENTS 1,630,426 Hasbrouck May 31, 1927 2,629,561 Heizer Feb. 24, 1953 FOREIGN PATENTS 413,601 Great Britain July 19, 1934

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