US2683291A - Draw box roll weighting mechanism - Google Patents

Description

July 13, 1954 A. D. HARMON 2,683,291

- DRAW BOX ROLL WEIGHTING MECHANISM Filed Nov. 24, 1950 3 Sheets-Sheet 1 July 13, 1954 A. D. HARMON 2,683,291

DRAW BOX ROLL WEIGHTING MECHANISM Filed Now-24,1950 a Sheets-Sheet 2 July 13, 1954 A. D. HARMON v DRAW BOX ROLL WEIGHTING MECHANISM 3 Sheets-Sheet 3 Filed Nov. 24, 1950 Patented July 13, 1954 UNITED STATES ATE NT OFFICE DRAW BOX ROLL WEIGHTING MECHANISM Application November 24, 1950, Serial No. 197,427

14 Claims.

This invention relates in general to draw boxes for the drawing of textile fibers and more particularly to draw box roll weighting devices.

It is well known that the degree of pressure applied to the several successive rolls in a draw box, to enable it to lay the fibers parallel and reduce the weight of the strand uniformly, depends on numerous conditions and for best performance should be individually established for each pair of rolls. For example the pressure between a particular pair of rolls to obtain proper grip for controlling the fibers and for preventing the top roll from slipping will depend on such factors as the peripheral speed of the roll, the

draft between successive rolls, the bulk of fibers handled by the rolls, and the character of the fibers. A higher roll'speed requires more weight because there is a greater tendency to vibrate and thereby produce uneven pressure on the drawing rolls resulting in uneven drawing. A

larger bulk of fibers requires heavier weight because it tends to hold the rolls apart and prevent fiber control. Harsh and wiry fibers as in drawing wool need more pressure than soft pliable ones. depending 'on whether both rolls of the pairs are metallic or whether of the common type in which the bottom roll is metallic and the top roll covered with resilient material as leather, rubber, cork, or the like.

It is desirable to be able to make these necessary individual adjustments rapidly, with precision and without undue effort.

The problem of accurate and simple weighting is further complicated especially in the case of common rolls by the fact that the resilient surfaces of the top rolls are very susceptible to injury and require relatively frequent attention involving removal from the machine. Rapid removal and replacement of the top rolls are required to clear the rolls of lap-ups. Removal may also be for purposes of replacement, check-.

ing for trueness of surface, or defects such as channeling or flute marks or even for proper storage during periods of machine shut-down. In all such cases it is desirable to readily remove or replace a particular top roll without disturbing the other rolls and their pressure settings or without loss of the established pressure setdig for the removed roll.

Substantially effortless and precise adjusting,

Also the weighting ratio changes unweighting and re-weightin-g means are not 3 only more conducive to accurate adjustment for better operation, but are also very important particularly under present high operating and labor cost conditions in minimizing down time' of the machine during the necessary adjustments.

Because of the relatively cumbersome construction of draw box. weighting devices heretofore used, much expensive time-consuming effort has been required in making roll changes andadjustments. For example,. heavy weights have often been used to load the top rolls. Besides being so heavy and hard to handle as to require physical strength beyond that of women operators, it is difficult to make fine adjustments of pressure between the rolls with these devices. Also the hooks used for suspending these weights from the top rolls were generally dimcult to malnipulate in releasing and re-weighting the r0 s.

In the instances where springs were used to load the rolls the conditions were not much improved. Separate adjustment at each end of the roll was necessary by trial and error methods for equalizing the pressure at both ends. Relieving the pressure at one pair'of rolls for removal and replacement generally necessitated relieving the pressure at all pairs of rolls with the possibility of disturbing individual adjustments.

Pursuant to the present invention, these difficulties are overcome in a draw box which incorporates a novel weighting arrangement which permits attention to and rapid adjustment and replacement of individual pairs of rolls without loss of the preexisting weighting thereof and without in any way disturbing other rolls in the draw box. Also accurate adjustment of pressure between the rolls of a pair at pre-selected known increments is simplified to adjustment at a single point with automatic equalization at both ends of the to roll. Release of a selected roll for easy and rapid removal, if desired, is reduced to a simple nearly effortless single lever action.

The above is achieved in a relatively simple, compact, inexpensive and readily manufacturable embodiment by providing generally a load transmitting or weighting member at each end of a top roll, with a pressure equalizing beam or bar adapted to transmit to both members a spring load imposed at a point on the beam intermediate the two members. The spring load at the beam is provided by fixing one end of a loading rod to the beam at the above interme-' diate point and compressing a spring surroundmg the rod between a stop at the other end of the rod and a 'fixed abutment formed by an extension of the machine frame between the equalizing beam and the stop. By making the stop in the form of a nut fitting a threaded portion on the end of the loading bar, the degree of compressionion the spring and thereby the pressure between the rolls is made adjustable.

Very accurate adjustment of pressure and removal of trial and error loading increment adjustments is achieved by providing calibration marks on the nut so arranged as to use the bottom portion of a cylindrical cover or shield over r the spring as a reference. The cylindrical cover or shield is crimped at both ends to restrict the extension of the spring to a desired maximum length thereby providing a suitable predetermined minimum pressure at the rolls, easy assembly of the weighting device, and correct and easy adjustment of pressure for a selected staple of fibers to be processed.

A lever having a fulcrum on the loading rod at a point at the far side of the fixed'abutment on the machine frame from the spring is provided with a cam surface which is used to lift the loading rod with respect to the abutment and in so doing serves to transmit the spring load wholly to the cylindrical cover or shield through which normally the spring thrust is delivered to the abutment, thereby unweighting the pair of rolls involved by removing the spring load from the weightingmembers which normally transmit the spring load to the ends of the top roll. Since this also takes the spring load off of the abutment on the machine frame, it permits the shift of the pairs of rolls in changing the roll setting without loss of the adjustment of the weighting of the respective pairs of rolls, which initial weighting is res-established when the lever is moved reversely to let the spring load again fall on the abutment on the machine frame. The load transmitting members are made in the form of a pair of hooks engaging the bearings at the respective ends of each top roll, and having a lost-motion and thus loose connection of each hook to its respective end of the equalizing beam, with auxiliary springs lifting the equalizing beam and loading rod and theparts carried thereby upwardalong the shanks of the hooks, thereby leaving the entire weighting system of each pair of rolls pendant therefrom to follow the lateral movement of such rolls in changing the roll setting, whenever the lever is moved to unweight the rolls by takingthe thrustof the loading spring on of the abutment. This. construction incidentally also permits the levers to be in a normally out-of-the-Way position during operation of the draw box- The extremity of the bent end of each hook applies the pressure at the center line of the bearing blocks at the ends of the roll, thereby providing center-point loading and permitting easy removal of the top roll even when the hooks are lifted only a relatively short distance. By fitting the hooks slidably in grooves atthe ends of the mounting blocks of each pair of. rollsand providing guide at these grooves, further assurance of loadingat the prop. er point of 'thetop rolls is obtained.

These and other objects, features, and advan tages" of the invention will become more ap parent from the following description taken in connection with the accompanying drawings showing a preferred embodiment of the invention and wherein:

Fig. 1 is a partially sectionalized end elevation of .a. draw box and weighting arrangement as seen from the deliverylend of. the draw box.

Fig. 2 is a side elevation with one side-plate partly broken away to show the construction more clearly.

Referring'to Figs. 1 and 2,-a weighting coil spring is enclosed ina cylindrical and expansionlimiting shield i2 having end portions is crimped I inwardly is compressed between an upper washer "l6 and lower washer i8.- The ccnnpre'ssion load ence.

' lower portion of eachbushing 5 is of the bushing 5t rests on a second washer 5 .3

therewith. Nutsfit and i613 clamp of the weighting spring it is transmitted at its upper end through the washer l5 and the upper crimped portion H! of the shield l2 to an abutment comprised by two horizontal bars l9 rigidly fixed in place on frame member 26 of a draw box 22 by screws 24. The compression load of the weighting springiii is transmitted at its lower end through the washer I8 and a stop 25, such asa threaded nut, to a loading rod 28. The lower end of the loading rod is has a threaded portion at to permit adjustment of the stop nut 26 so as to control the degree of compression of spring is and thereby the load on loadin nd 28. Trial and error loading of the loading rod 28 may be removed by providing calibration marks 32 onthe stop nut '25. The calibration marks 32 are spaced preferably for equal fine increments of load and may be read with the bottom crimped portion I of shield H! as arefer- The crimped portions it and Washers H3 and lficonfine the weighting spring id to a maximum axial extension determined by the distance between the crimpeo portions Hi. When the lower washer Hi is just raised by the stop nut 26 above the bottorncrimped portion it as shown in Fig. l, the weighting spring It is producing its minimum load onloading rod 28. This point may be designated by alignment of the top calibration of the marks with the lower crimped portion is of the shield l2 as shown in Fig. 1.

A locking nut st maybe provided for looking. the stop nut 26 in place after a proper adjustment has been made.

Theload from weighting is on loading rod 28,- which extends slidably through a central hole in a bushingiit a rounded supported by bars is, is transmitted by the loading rod 28 through a member termed the lift adjuster (for reasons given laterherein) to the center of a load equalizing beam til. The lift adjuster 33 is screwed onto the threaded upper end 44 of loadingrod 28 and mounted with a sliding. fit in a hole in beam it. being retained therein by a flat head on its upper end and a washer to the two hooks ociatd therewi h, beam to is provided at its ends with hubs 4& having holes therethrcugh parallel to and iidistant from the axis of .loadingrod 26, which slide fr Y the upper portions iii of bushings S l incur ed the threaded lower ends 62 of the hooks The diameter than the upper portion and on the shoulder formed at junction of these two ditferent outside diametersrests a washer engagingthe under surface of hub The bottom of ch loci:

is supportedfrom below by a stop nut nut 59 on threaded portion 62. Through this bushing the downward pull of cone beam to is delivered equally .to the two hooks t assoc t e in position between washers 56 and int and r. vide adjusting means for leveling equalizing 40. Leveling of the equalizing beam ce. lizcs the T-shaped bushing 35 between the support bars 39, preventing binding of theloading rod 28 and preventing unequal loading of the two hooks 60. Bushings '52 also protect the threads on the ends 62 of hooks [it from chafing in the ends of equalizing beam 40. r

The load from weighting spring it is. evenly distributed by the load equalizing beam 48 between its pair of hooks Bil since the lift adjuster 38 is in a position midway between hooks 6B. These equal loads on the two hooks 68 are transmitted, through the free ends 54 of hook-shaped end portions 65 (Figs. 2 and a), forming the upper ends of the hooks 60, to support-blocks 68 for top rolls ill in a downwardly direction at the vertical center line 12 (Fig. 2) running through the axis of the top rolls It. The equal loads from each member of the pair of hooks 60 on the support-blocks 68 are transmitted through bearings such as ball bearing sets M to the pintles '35 of top rolls Til. Because of clearance 13 (Figs. 1, 2 and 4) between support-blcks 68 and mountingblocks 89, the equal loads at top roll ends 16 result in a pressure which is equal and uniform throughout the length of the line of contact 32 between top roll it, in this instance having a resilient covering 83 (Fig. 4) such as rubber or cork, and bottom roll 84 which is firmly mounted in place by its ends 86 in bearings such as ball bearing sets 88 held'in mounting-blocks 89.

A lever 96 having a handle 92 at one end and a forked construction at the other end with parallel cam surfaces 9% and straddling the loading rod 28 is provided with a fulcrum on the loading rod 28 at a point between the equalizing beam to and the abutment formed by the rigidly fixed bars is on the machine frame 20. The fulcrum consists of a pivot member 96 such as a bolt in holes through both lever fill and loading rod 23 and having aligned axes perpendicular to the axis of the loading rod 28. I I l v In normal operating position the leverti] will be down, with the handle 92 ointing downward in an out-of-the-way position beneath the draw box 22 as shown in Fig. 1; In thispositiona space '98 will exist between the cam surface '94 of lever cc and the top of the bushing 36. In this position of lever 98 the full load from weighting spring Ill will be transmitted to the top roll 1%. a

When the handle 92 of the lever is raised the high portion 692 of the cam surface 94 impinges against the top of bushing 36 forcing the latter downward slightly and causing the pivot member 95 to move the loading rod 28 upward, compressing loading spring iii and raising liftad juster 38, thus unweighting the equalizing beam 49. This permits beam 413 to rise under the upward pressure of expanding coil springs H0 surrounding the lower portion 52 of each bushing 54 and confined between washers i! and 56, the lesser-diameter upper portions. 5| of bushings 54 being as noted arranged with a free fit in the holes at the ends of the equalizing beam 40. Therefore, as loading rod 23 moves upward the equalizing beam ii! being urged by springs Hi! slides upward relative to the bushings '54, stopping before encountering washers H36 backed up by stops N38. The stops m8 are nuts screwed onto the threaded portions 62 of hooks Si) and locked in place by 1001: nuts H19.

The springs I :0 expand as the equalizing beam 60 moves upward and hold the hook portions 66 I of hooks be firmly but yieldingly in place on support blocks 68. The upward movement of the equalizing beam 40 is controlled by the amount of lift at the cam surface Hi2, and the adjustment of 6 the threaded portion 44 of loading rod 28 in the lift adjuster 38. The latter is the primary point of adjustment for providing the correct rise of the equalizing beam 45 to a position short of contact with washers 106. When handle 92 of lever 99 is in its raised position, and the equalizing beam 40 is in its raised position, the upper ends 66 of hooks 60 can be moved inward off the support blocks 68 manually against the pressure of springs H0 and rotated a quarter turn on their axes to provide clearance for the removal of the top roll "Hi with its support blocks Gil. The hooks 69, when not supported by support blocks 68, move downward until washers we bear against the top of equalizing beam M, which, in turn,.is stopped from moving downward by washer .8, loading rod 28, cam 95, and bushing 35 hearing on fixed support bars 19.

When as stated lever So is in raised, unloaded position, the main loading spring ll.- exerts no pressure against any part of the draw box frame or rolls. This is so because the raising of lever into its unloading position causes its cam surface IM to intervene rigidly between the pivot point 96 and bushing 36, and thus to create a self-contained, stable, balanced system of forces (tension and compression) between the two ends of the system, namely, pivot point as and stop nut 26. This system exerts no force against any point outside it due to loading spring it, although the weight of its parts of course is supported through the upper end of rod 28 and beam to by hooks 60 when they are in place on support blocks 6B. When hooks as are removed from support blocks 68 for removal of top roll it, as described above, the weight of all the parts is then supported by the flange of bushing 36 resting on bars 19. In this raised, unloading position of lever 9i 7 the closed system of forces which contains load ing spring H) has as its tension member the rod 28, between pivot point 526 and stop nut 25. Its compression members are: the cam portion of lever 90 between pivot point 9% and cam surface 102 which presses on bushing fit, which presses in turn on the upper crimped portion of shield I2, which presses through Washer !6 on compressed loading spring lfi, which then presses through washer 18 on stop nut 26 fixed at the lower end of rod 28, thus closing and balancing the load system and effectively removing all but the Weight of the parts from any reaction against the frame or rolls.

The shield I2, as such, plays no part in this closed system of forces, but is merely suspended from its upper crimp'ed portion which is firmly held between the lower surface of bushing 35 the upper end of loading spring it acting through washer IS; the lower end of spring it bears against stop nut 26 through washer it, and not against the lower crimped portion of shield 12. Shield l2, as referred to elsewhere, serves to provide a predetermined minimum compression of spring I 0; its lower crimped portion is a convenient reference for adjusting calibrated stop nut 26, and it provides a convenient package for containing the loading spring it during disasseinbly. By using the free end 64 of each hook E9 as the load transmitting point instead of the whole curved portion 56 of the hook, not only is pure vertical loading insured but also the necessary upward travel distance may be shortened and still permit removal of the top roll it and its support blocks 68, thereby permitting compactness of construction. I

Flat sides Ill (Fig. 2) are provided at the circumferential recess I I2 (Fig. 4) about the periphery'of the support blocks 68.. The flat sides .I I! fit slidably between upright yoke members or.

fingers I 14 formed on the top of mounting blocks 80, thereby keeping the top roll It in proper alignment with the bottom roll 85 and preventing rotation of support blocks 68 and further insuring stable vertical loading by the book ends 64.

Additionally, a guide i it, Fig. 2, is fixed in a slot in each mounting block 8% having a'hole receiving the shank of each hook t and permitting axial sliding motion of the hook along the left side of mounting block 3t, thereby helping to maintain the end t l of hooked. portion 655 at the center line 12 of the top roll it.

Each pair of mounting blocks 83 is clamped in place against a rigid base i it by a rod I29 and nut fastening I22. The rigid base H8 is itself fixed in place on the frame member as by screws i 23. While not limited thereto, in the embodiment there are four pairs of mounting blocks til, each mounting a pair of draw rolls weighted, as described above and a pair of mounting blocks appearing second from the right in Fig. 2 are irnmovably fixed in place. The other three sets of mounting blocks with their cor 'esponding weighted rolls, each have rack teeth iti l at their bottom ends meshing with the teeth on a corresponding pinion 26 having a squared end :23. By loosening nut 822 on the end of clamping rod sze and turning the squared end 523, a correspending pair of mounting blocks 85 may be moved to the left or right on guides 2%, thereby permitting adjustment of the distance between axes of adjacent pairs of draw rolls for a particular staple of fiber to be processed by draw box 22. A slot ESQ (Fig. 2) is provided in side plate :32 to accommodate the lateral movement of the nuts lit in this adjustment. Grooves I3 5 (Fig. 3) on both sides of mounting blocks-$8 and recesses lSt (Fig. 2) receive the hooks 6t and guides H5 respectively. This mechanism for setting the rolls forms no part of the present invention.

It should be noted that when such adjustment is to be lever at is raised, and thereafter hooks equalizing beam and loading rod 23, with weighting spring ill, will move laterally together with the mounting blocks 89, pendent therefrom and thus in proper alignment therewith along a vertical plane. There is no binding against the rigid support bars 19, because when the handle Q2 of the lever lie is raised and hooks 5t are supported by support looks St, the com bined weight of equalizing beam til; lift adjuster 38,1oading rod 23, lever bushing 35, spring l and shield it, is supported-by springs l iii. Bushing 36, having its sleeve portion longer than the vertical thickness of bars it, becomes a spacer delivering the thrust of cam S d directly to the top of shield l2, thus depressing the latter and relieving the normal pressure of the shield upward against bars 19.

Adjustment to compensate for roll. wear is made by screwing the lift adjuster 38 :farther down on loading rod 2t,'fii:ing it by locknut E5. Adjustment for roll wear may alternatively be made by moving pairs of nuts lit andlfi and the intervening bushings 55 on both sides upward equally", so long as the available length of hooks 8!] and of the hreaded lower ends 52 thereof are adequate for the required amount of adjustment; but the lift adjuster 33 is the-principal means for obtaining this adjustment, because simpler.

The drawbar 22..also incorporates an underclearer I34 contactingthe bottom rolls- 3% and mounted on a slide. I36 with the handle I38 and mounted for proper upward wiping pressure on springs Hit fastened to .the rigid base H8 by screws I42.

A condensing guide I44, Figs. 2 and 3, is'interposed between the second and third pairs of rolls in thedraw box, being mounted in a vertical plane on supports I46. restingon adjacent pairs of support blocks 80. This guide is slotted horizontally throughout the major portion of its width, with tongues I48 extending obliquely toward, the nip of the succeeding pair of drawing rolls to gatherin the lateral edge of the fleece or sliver being drawn in the draw box.

This invention is not limitedto the particular details of construction and operation herein described, as equivalents will suggest themselves to those skilled in the art. It is accordingly desired that the appended claims be given a broad interpretation commensurate with the scope ofthe invention within the art.

What I claim is:

1. Weighting means for the top rolls of a draw box operating on textile fibers com rising in combination a load-transmitting member weighting each end of a top roll, a beam transmitting a load tosaid members, a loading rod having one end held to said beam at a point midway between saidmembers, an adjustable stop at the other end of said rod, graduations on said stop for selectively setting said adjustment, a fixed abutment, means thereon providing an index reading against such graduations, and a spricng loading said rod compressed between said-abutment and the stop and exerting pressure against said stop to a degree controlled by the'adjustment or said stop, thereby providing selective equalized loading of said top roll. I

2. Weighting means'for the top rolls of a draw box operating on textile fibers comprising in com bination a hook suspended from each end of a top roll, a loose load-equalizing member in load transmitting engagement with said hooks, an abutment, spring means reacting against the abutment producing a load on said member at a point between the hooks, and lever means in cooperative relation to said spring means removing the load from the member by further stressing'the spring means and preventing its reaction against the abutment.

3. Weighting meansfor the top rolls of a draw box operating on textile fibers comprising in combination a load-transmitting member wei hting each end of a top roll, a beam transmitting a load to said members, a loading rod having one end held to said-beam at a point intermediate said members, a stop at the other end of said rod, fixed support means at said rod between said stop and said'beam, a spring loading said beam and compressed between said stop and said support means, and alever disposed to selectively apply and remove from said load-transmitting members the load of said spring.

4. Weighting means for the top rolls of a draw box operating on textile fibers comprising in combination a load-transmitting member weighting each end of a top roll, a transmitting a load to the members, a loading rod having one end held to the beam at a point intermediate the members, a stop at the other end or" the rod, fixed support means at the rod between the stop and the beam, a springloading the beam and compressed betweenthe stop and the support means,

and a lever having a fulcrum on the rod and adapted to lift the rod, thereby removing from the load-transmitting members the load of the spring.

5. Weighting means for the top rolls of a draw box operating on textile fibers comprising in combination a load-transmitting member weighting each end or" a top roll, a beam transmitting the. load to such members, a loading rod having one end held to the beam at a point intermediate the members, a removable stop at the other end of the rod, fixed support means at the rod between the stop and the beam, a spring on the rod compressed against the stopand the support means, and a hollow cylinder housing the spring and having portions at both ends limiting the springs extensions.

6. Weighting means for the top rolls of a draw box for drawing textile fibers having in combination a hook suspended at its upper end from each end of a top roll, a load-equalizing member having a passage at each end through which the shank of one of the hooks extends, stops on the shank of each hook spaced apart to allow limited axial movement of the shank in the passage, means loading the equalizing member and the hooks, and a spring reacting against the equalizing member and one stop on each hook to urge the other stop thereon toward such member.

7. Roll weighting means for a draw box operating on textile fibers comprising in combination a hook weighting each end of a roll and having a portion of its shank threaded, means on the threaded portion in spaced relation to each other and defining an adjustable top and bottom stopon each hook, a load-equalizing beam transverse to the shanks and having holes slidably fitting the shanks between the stops, a spring surrounding the shank of each hook between the stops, a loading rodhaving one end held to said beam at a point midway between said hooks, an adjusting nut at the other end of said loading rod, a fixed abutment, a spring on said loading rod compressed between the abutment and the nut by an amount controlled by such nut, and a lever having a fulcrum on the loading rod and adapted to lift such loading rod and relieve the springs pressure against the abutment.

8. Roll weighting means for a draw box operating on textile fibers comprising in combination a hook in load-applying relation with each end of a roll and having a threaded shank, means on the threaded shank of each of the hooks and in spaced relation to each other and defining an adjustable topand bottom stop on each of the hooks, a load-equalizing beam transverse to the shanks and having holes slidably fitting around the shanks between said stops, a spring on each shank urging the beam toward the top stop, a loading rod having one end held to the beam at a point intermediate the hooks, an adjusting nut at the other end of the loading rod, fixed support means at said rod between the nut and the beam, a spring on the loading rod compressed against such adjusting nut and the fixed support means, and a lever having a fulcrum on the loading rod and a cam surface engaging a surface in connection with the fixed support means to lift the loading rod with respect to the support means.

9. Roll weighting means for a draw box operating on textile fibers, having in combination hooks each weighting one end of a roll by engageiii inent with parts on the end of the latter, a bar connecting the hooks, an abutment, spring means reacting against such abutment loading the bar, and lever means applying additional stress to the spring means preventing its reaction against the abutment thus relieving the load on the bar and unweighting the hooks.

10. Roll weighting means for a draw box operating on textile fibers, having in combination hooks each weighting one end of a roll by engagement with parts on the end of the latter, a bar connecting the hooks, spring means including a tension element acting on both ends of the spring and loading the bar, and lever means movable in one direction to further stress the spring means to remove the spring load from the bar, and in the other direction to restore the initial spring load to the bar.

11. Roll weighting means for a draw box operating on textile fibers, having in combination means transmitting and equalizing the weighting force applied to the two ends of a roll, and weighting means employing a loaded spring and a tension element and adapted both to exert force upon the first means so as to effect the weighting of the roll and alternatively to be self-contained and free the roll from the weighting force of the spring by confining the springs entire force to the tension element.

12. Roll weighting means for a draw box operating on textile fibers, having in combination means transmitting and equalizing the weighting force applied to the two ends of a roll, an abutment, a spring reacting thereagainst and normally creating the weighting force, and means further loading the spring and relieving the force applied to the abutment by the spring.

13. Roll weighting means for adraw box operating on textile fibers, having in combination a spring normally creating a weighting force, means including a tension element transmitting the weighting force to the ends of a roll, and means on the tension element optionallytaking the force of both ends of the spring and thereby relieving the load on the roll.

14. Roll weighting means for a draw box operating on textile fibers, having in combination a spring normally creating a weighting force, means including a tension element transmitting the weighting force to the ends of a roll, and means on the tension element optionally connecting first one end and alternatively both ends of the spring to the tension element to weight and unweight the roll, respectively.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 26,031 Hale Nov. 8, 1859 855,430 Chadderton May 28, 1907 1,362,603 Crane Dec. 21, 1920 2,091,230 Hodge et al. Aug. 24, 1937 2,249,408 West July 15, 1941 2,315,936 Cobb Apr. 6, 1943 2,458,852 Helland Jan. 11, 1949 2,466,086 Dudley et al. Apr. 5, 1949 2,618,026 Dawson Nov. 18, 1952 FOREIGN PATENTS Number Country Date 228,897 Switzerland Dec. 16, 1943

Images