US2861439A

US2861439A - Means for adjusting the tensioning of material wound on a beam

Info

Publication number: US2861439A
Application number: US545707A
Authority: US
Inventors: Fazis Hermann
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-11-08
Filing date: 1955-11-08
Publication date: 1958-11-25
Anticipated expiration: 1975-11-25

Description

Nov. 25, 1958 H. FAZIS MEANS FOR ADJUSTING THE TENSIONING OF MATERIAL WOUND ON A BEAM 3 Sheets-Sheet 1 Filed Nov. 8, 1955 8 M YN n n vQ VN O 0V NN m V 0N v n, a 0 9 AM 2 E I I S u 72 1 .H :31 m w u u mm V N v w 3 w mv x a m Q. Q wm N s 9 rm 3m EN RN 7 3 G. .A v m 0N VP w 3N v 2.

Now 25,1958 H FAZIS 2,861,439

MEANS FOR ADJUSTING THE TENSIONING OF MATERIAL WOUND ON A BEAM Filed Nov. 8, 1955 3 Sheets-Sheet 2 Nov. 25, 1958 H. FAZIS MEANS FOR ADJUSTI NG THE TENSIONING OF MATERIAL WOUND ON A BEAM Filed Nov. 8, 1955 3 Sheets-Sheet 5 't'erial at every moment.

United S ates Patent MEANS FOR ADJUSTlNGTHE TENSIONING'OF MATERIAL woUNn oN ABEAM Hermann Fazis, Weil (Rhine), Germany, assignor to David Rothschild, Zurich, Switzerland Application November 8,1955, Serial No. 545,707

3 Claims. (Cl.'-64'30) Thepresent invention relates to-means for adjusting the tensionof material wound on -a beam.

The uniform winding and unwinding of strip-shaped .-material-and more particularlyof'textile materialonto and exerted on the beam cannot remain constant and it must vary inaccordance with the diameter of the wound ma- To this end, adjusting means have already been proposed wherein a feeler is adapted :to test-the'amount of material wound on the shaft while the value thus-measured serves for adjusting correspondingly-the torquereferred to. -Such adjusting means are however comparatively .intricate and uneconomical.

It is, thereforeyone object cf-the present invention to provide-aquite different method whichrelies on the fact that it is possible to-make thetorque exerted on the-beam responsive 'tothe weight-at the'moment considered of the reeled or wound material since-the increase and-decrease '-of-the'- reeldiameter corresponds to a simultaneous increase-and-decrease of the reeled weight.

It is another-object of-the present invention toprovide means for-adjusting the tension of material wound on a beam, wherein the coupling through which the beam is connected -with thearrangement adjusting the tensioning *of the material is improved.

sIt is, thus, still another object of the present inven -:tion'-to-pr0vide means for-adjusting of material wound "on a -beam,'whereinthe introduction of the beam rod into the head of a driving shaft is performed inaa much easier -and reliable manner.

-It-=is yet another object of thepresentinvention to provide-means for-adjusting ofmaterial wound on.a beam, wherein the cooperating parts of :the locking member and the projectionand recessestare designed in such-manner thatthe handwheel or the likellocking member is rocked its open inoperative position;

,FigJZ is-a section along the lines 2-2 of 'Fig. 1, shown on a larger scale;

a Fig. 3 is a fragmentary side viewof the 'couplingin its locked. or operative position;

;Fig. 4 is anend viewbfQthe coupling,-,frorn thebeam [d Side.

ice

' Referring .now to the drawing and-in particular to Fig. 1, the central bore ofan otherwise entirely closedcasing 1 carries a rocking ballbearing 2 the inner race of which is rigid with a stub shaft 3. The stub shaft 3 forms a two-arm rocking lever, the rocking axis of which extends through the center 7 of the rocking ball bearing 2. The stub shaft 3 includes a short lever arm 3a projecting out of the casing 1 and the outer end of which'carries a supporting member 4 while the other, longer lever arm 3b is completely-enclosed inside'the casing 1.

The supporting member 4 has a U-shaped vertical cross-section so that it defines a four-sided recess 4a (Fig. 4) open at one end, said supporting member 4 being provided with ashiftable locking member adapted to hold in position one end o'f-the beam 5 and matching the shape of the supporting memberengaged thereby. The locking .member is constituted in the case shown inthe drawingby a handwheel 28, the body of said handwheel being rockably' mounted on the supporting member 4 so as to rock upon the transverse axis 29 withreference to the supporting member 4; with a view to introduce and to remove, respectively, the beam 5 into and out of position, the handwheel 28 is hifted into oblique position, shown in Fig. 1, in whichposition it engages an abutment on the casing formed-by a bevelled surface area 1a, while it uncovers the opening in the supporting member 4. Before startingthe operation, the handwheel is rocked back into the position shown in Fig. 3 upon its axis -29 until it abuts against a top '30 on the supporting member 4, at which moment it lies in-itslocking position perpendicular to the axis-of the stub-shaft 3, while the handwheel 28 closes the 'opening in the supporting member 4 and the beam-5 is locked in a=position in which it is coaxial With the axis of vthe stub-shaft'3.

The stationary section lb' at the front end of the casing 1 preventsth'e return of the-handwheel 28 into a position other thanthat illustrated" as long as the foursidedrecessda in the-supporting, member 4 is not directed "upwardly. "In-case the driving shaft is caused to turn ably mounted .in any desired'conventional manner.

while-the handwheel 28 is in its inoperative position as "a'cons'equence'of negligence or oversight, the stationary section urges automatically the wheel 28'upwardly and locks thereby of necessity the supporting member 4 in position.

The other'end-of the beam (not shownlcan be rotat- -A rotation of thehandwheel 28 causes a rotation of the stub-shaft '3 into the position *shown in Fig. 1, in which the opening in the supporting member-4 faces upwardly, was to allow theintroduction-and removal of the beam j5zinto said opening, which-operation isfurthered through the uiding ribs orfins28b formed on the web 28a of the handwheel 28.

:The longer arm of the'leverzformed by'the st-ub-shaft 3, which" is farther from' the supporting member 4 extends through its outer reduced diameter end inside a hollow carrier9- disposed inside the casing 1- and the upper surface ofwhich is formed'as acamwltl which is engaged by a'membe'r constituted by a follower roller 11. To this 'end, the upper"sectionof 'the hollow carrier 9 is formed as said cam surface 10-whichforms advantageously a spherical cap over which 'the'follower 'r'oller -11-"is adaptedto 'run. This foll'owerroller' -11 is'carried by an adjusting lever '12 theinner-end-of which is ri idly connected with a 'forked member 31, as illustrated in Fig.2,

as provided by-a'connection by means of avpin-32. The

forkedmember 31.is provided with a central slot in which wtheroller-ll' is:rotat-ably mounted by means ofa transversesoindle33. The arms 34of the forkedlmember 31,

one of which is shown only in thedrawinq, form vertical ,guides for; the hollow carrier 9 and are pivotallysecured to coaxial pivots 35 one of'which only'is shown in'the f pivots35 crosses the axis 6 of the stub-shaft 3 (Fig. 1).

. As illustrated in Fig. 2, the adjusting lever 12 is tubular and is provided with two diametrically opposed longitudinalslots 36 engaged by a locking pin 15. Said pin is rigidly secured ina corresponding transverse bore of the head 37 of a push rod 38 sliding inside the tubular lever 12 and the outer end of which forms a threaded projection onto which a ball shaped member 26a is screwed.

This ball shaped member 26a is located outside the tubular lever 12 in which a compression spring 39 surrounding the pushrrod 38 is located, the spring 39 engaging at one end the head 37 of the rod 38 and at its other end the inturned terminal edge of the tubular lever The spring 39 is subjected to a preliminary tensioning so that it constrains the locking pin 15 to remain in its lever-locking position shown in Fig. 2. In this position, the lockingpin 15 engages selectively one of the notches 14 in the casing 1 so as to prevent any undesired angular movement of the adjusting lever 12; a series of such notches 14 is formed on the outer surface of the casing 1 to either ide of a notch formed symmetrically in i the vertical medial longitudinal plane of said casing, and through which slot the adjusting lever 12 projects. These notches thus permit of positioning of the adjusting lever 12 and consequently the follower roller 11 or presser member is retained in any of a number of different angular positions.

The lower surface of the hollow carrier 9, is subjected to the action of a compression spring 40 the lower end of which engages the bottom of the casing 1; the spring 40 urges the surface 10 of the hollow carrier 9 permanently into operative engagement with the follower roller 11 and is guided by a guiding rod 41 extending through it andheld between the hollow carrier 9 and the longitudinal slot 42 in the bottom of the casing 1. In the chamber formed inside the hollow carrier 9, the stub-shaft 3 is held by means of two roller bearings 8 and 8a and of a thrust bearing 19 fitted between the latter. This chamber in the hollow carrier 9 encloses also to the rear of the stub-shaft 3 a cup-shaped thrust member 17 which bears against a threaded pivot 16 screwed rearwardly into the centrally tapped bore of the support: 9, while it is held fast by a counter nut in the adjusted position assumed by it. Saidthrust member 17 engages theouter race of the ball bearing 8a which engages on the other hand a spacing member 18 fitted between said roller bearing 8a and the thrust'bearing 19. On the opposite side of said thrust bearing 19, is inserted a ring 20 cooperating with the inner race of the farther ball bearing 8, which latter en- 3, one half of a friction coupling, the other half of which is formed by a chain wheel 26 and an auxiliary wheel 25 sliding longitudinally with reference to the Wheel 26 and revolving in unison therewith by; means of transverse pins 27. The auxiliary wheel 25 is freely rotatable be- .7 tween ,the brake linings 24 and 24a which latter are carried by, the sides of the

clutch plates

22 and 22a which face each other.. T he chain wheel 26 is freely rotatable with reference .to the stub-shaft 3 by interposition of a 1 ball bearing 44 and it is permanentlyturned in a manner (not shown) by means of atmotor-driven chain, therotation of which is performed in the de ired direction of rotation of the beam 5.

' The fraction of the weight transferred by the beam 5 through its rod to the supporting member 4, which corresponds normally to one half of the weight of the loaded beam 5 at the moment considered, is transferred again, proportionally with the ratio between the operative lever arms of the stub-shaft 3 to either side of their pivotal axis 7 and through the bearings 8, 8a and 19, onto the carrier 9 and from the latter to the roller or the like presser member 11. The reaction pressure thus produced is shown in Fig. l by the arrow P and may be divided into a vertical component V and a horizontal component H. The vertical component V balances the fraction of the weight of the beam 5 which acts on the supporting memher 4 whereas the horizontal component H is transferred through the screw 16 to the thrust member 17 and thence through the outer race of the ball bearing 8a, the spacing member 18, the thrust bearing 19 and the ring 20 to the inner race of the bearing 8 and thence through the transmission member 21 to the plate 22. This leads to a corresponding slight axial shifting of said plate 22, accompanied by a corresponding shifting of the plate 22a whereby the friction coupling is engaged to an extent depending on the magnitude of the compression force H and consequently the coupling linings 24 and the like transfer a corresponding torque to the

plates

22 and 22a and therethrough to the stub-shaft 3 so that the beam 5 is angularly rotated through the supporting member 4.

Thus, as'the winding procedure progresses and the weight of the beam increases, the horizontal component H'defining the force exerting on the friction coupling increases correspondingly, which horizontal component is produced 'by the reaction of the follower roller 11. Consequently the driving torque transferred through the friction coupling increases in such manner that at least approximate constancy of tensioning for the material that is being wound is achieved, regardless of the gradual modification in the diameter of the reel on the beam 5.

Instead of exerting a driving torque, it is possible also to exert a braking torque on the beam 5 so that the chain wheel 26 is no longer driven, but is braked.

In so far as the speed of rotation of the chain wheel is higher than the speed of rotation of the beam 5 as should always be the case, when driving the beam 5 through the friction coupling, the latter obviously 'slips.

When one wishes to shift the control lever 12, the attendant takes hold of the ball 26a and draws out the latter, by compressing the spring 29 to release the locking pin 15 with reference to the notch 14. One may thus rock the lever 12 into another position and after release of the ball 26a by the attendant, the spring 39 urgesthe pin 15 inwardly sons to engage another notch 14 facing it. As it is apparentfrom Fig. 1, the lever 12 can be rocked beyond its vertical position-whereby the positioning force H reaches a zero value, so that the coupling is disengaged.

While I have disclosed one embodiment of the present invention, it is to be understood that this embodiment is given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

I claim:

1. A weight sensitive friction coupling comprising a casing having a centrally disposed bore, a pivot-type bearing having an inner and an. outer race disposed in and carried by said casing, a shaft rigid with said inner race and mounted in said casing for rotating movement and for rocking movement upon a pivot point disposed in the rotating axis of said shaft, one end of the latter being adapted to be subjected to a variable weight, a swingable lever pivotally secured to said casing and adjustable to a plurality of angular positions relative to the rotating axis of said shaft, and means forexerting a thrust in axial direction of said shaft from said lever dependent upon its angular position, a friction coupling including two sections, one of said sections constituting driving and braking means, respectively, and the other of said sections being secured to said shaft for common rotation, said one end of said shaft permitted to perform a rocking movement to vary the friction of said coupling as a function of the weight placed upon or removed from said shaft, and, thereby to vary the speed of rotation of said shaft.

2. The coupling, as set forth in claim 1, wherein said shaft constitutes a double lever rockable in said pivottype bearing.

3. The coupling, as set forth in claim 2, wherein said References Cited in the file of this patent UNITED STATES PATENTS 1,827,893 Kindelmann et al. Oct. 20, 1931 2,436,418 Bradford Feb. 24, 1948 2,729,079 Kuehn Jan. 3, 1956 2741.102 Monkley Apr. 10, 1956