US3126585A - Apron control means for drawing apparatus - Google Patents

Description

March 31 1964 w. H. TABOR ETAL APRON CONTROL MEANS FOR DRAWING APPARATUS 2 Sheets-Sheet 1 Filed Dec. 51, 1959 IN V EN TORS H. TABOR AVALLARO "'fiI/LZMIM WARNER ALBERT C ATTORN EYS March 31, 1964 w. H. TABOR ETAL 3,126,585

APRON CONTROL MEANS FOR DRAWING APPARATUS Filed Dec. 51, 1959 2 Sheets-Sheet 2 l INVENTORS /7 WARNER H. T R

\ I BYALBERT CAVA ARO ATTO R N EYS United States Patent Ofifice H 3,126,585 Patented Mar. 31, 1964 3,126,585 APRON CONTROL MEANS FOR DRAWING APPARATUS Warner H. Tabor and Albert Cavallaro, Bristol, R.I., as-

signors, by mesne assignments, to Dixie Machine &

Tool Company, Greensboro, N.C., a corporation of North Carolina Filed Dec. 31, 1959, Ser. No. 863,304 6 Claims. (Ql. 19-244) This invention relates to a spinning, roving or like apparatus and particularly to the apron which is back of the front set of upper and lower rolls for drawing the strand.

In the operation of a spinning, roving or like apparatus, it is usual to provide a front set of rolls comprising upper and lower rolls and rolls back of this front set comprising upper and lower rolls with an apron about either or both of the upper and lower rolls which aprons travel about bars between the front set of rolls and the rolls back of the front set so as to engage and control the strand as it moves toward the front set of rolls. The bar about which the lower apron travels has a curved forward end and the apron in traveling over this curved surface usually sags forwardly toward the lower front roll, and the bulge or belly of this apron is such that its surface just clears the surface of the front lower roll and is spaced substantially from the bar as it travels downwardly. Due to the curvature of the front rolls, a bar about which an apron travels usually leaves a substantial space between the apron and the nip of the front set of rolls so that the strand as it moves forwardly is out of contact with the apron and thus the apron cannot exercise any control of the fibers in the strand for a substantial distance. This lack of control permits the ends of the fibers in the uncontrolled space to extend outwardly from the body of the strand to the detriment of the strength of the strand.

Gne of the objects of this invention is to reduce the space between the apron and the nip of the front set of rolls so as to minimize the uncontrolled extent of the strand during the drafting operation.

Another object of this invention is to provide a separable means which may be clipped onto the bars about which the apron extends in existing mechanisms so that existing apparatus of this type may be easily converted to the form of this invention.

Another object of this invention is to provide an improved tensioning means for the apron by which an apron may be maintained in a tight relation and thus closer to the nip of the front rolls and still clear the lower front roll than if an apron had some sag in it.

Another object of this invention is to provide a tensioning means for a plurality of aprons so that the tension may be adjusted for a number of aprons at one time.

Another object of the invention is to provide more uniform strands from an apparatus where there are a plurality of ends of strands operating by providing a more uniform set of conditions in the apparatus by reason of simultaneously tensioning or adjustment of the tension of a number of aprons which operate upon a number of ends at one time.

Another object of the invention is to provide a stronger strand and yet one of the same weight.

With these and other objects in view the invention consists of certain novel features of construction as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings: FlGURE 1 is a sectional view of a fragmental portion of a drawing frame showing one of a plurality of roll stands with the mechanism of the apparatus equipped with this invention;

FIGURE 2 is a fragmental elevational view illustrating a plurality of tension rolls and a common tension bar for adjusting the tension on these rolls, the bar being mounted between a pair of roll stands;

FIGURE 3 is a perspective view of the tensioning bar;

FIGURE 4 is a perspective view of the clip which is mounted on the guide bar over which the apron extends;

FIGURE 5 is a perspective view of a spring arm which is utilized in connection with the bar of FIGURE 3 for applying tension to the tension rollers of the apron;

FIGURE 6 is an enlarged diagrammatic view of the relationship of the front set of rolls and the apron which travels about the set of rolls back of the front set of rolls; and

FIGURE 7 is a cross sectional view of a modified form of guide bar and its relation to the front rolls.

In proceeding with this invention, we have provided a modified form of bar about which the lower apron travels or have provided clips from sheet metal which may be snapped onto existing bars over which the apron travels at each of the locations of the apron lengthwise of the apparatus so that the apron will travel closer to the nip between the two front rolls of the apparatus. In connection with this change of shape of the bar or supplemental clip on the bar, it is necessary to provide tension on the apron in order that the apron will clear the lower front roll of the apparatus. We also have provided a tension bar mounted between two roll stands upon which there is mounted a pair of arms for each apron tension roll for engagement with the trunnions or shaft upon which such roll rotates. These arms being upon a common bar may be all adjusted simultaneously for the adjusting of a plurality of tension rolls at one time and applying the same tension on each of the plurality of rolls for the more uniform production of yarn.

With reference to the drawings, 10 designates the fragmental portion of one roll stand as shown in FIGURE 1 which has a supporting leg which is to be mounted upon a roller beam (not shown). The body portion is designated 12 in which there is provided a plurality of bearings for a plurality of bottom rolls while at the rear portion of the stand an arm 13 projects downwardly and serves as a mounting for a tension bar 14 as will be more fully hereinafter described.

The roll stands rotatably support a front set of rolls 15 comprising a top roll 16 and a lower or bottom roll 17. Also there is provided a set of rolls 1?: comprising a top roll 1) and a lower or bottom roll 20, while between these two sets of rolls there is an intermediate set 21 comprising a top roll 22 and a lower or bottom roll 23. It will be understood that the bottom rolls 17, 2t) and 23 extend in sections having bearings in a number of roll stands and that the roll stands provide rotatable bearings for these bottom rolls, whereas the top rolls l9 and 22 occur in pairs and are guided by bearings carried by an overarm 25. Saddles 26 and 27 serve to apply weight through the arm 28 to the top rolls. This overarm also carries a top bar 29 about which the top apron 3b is guided in its travel about the roll 22.

A bar 31 is located between the lower rolls 17 and 23 and supported by a body portion 12 of the roll stand. A lower apron 32 embraces the lower roll 23, the bar 31 and also a tension roll 33 which is hung by the apron below the roll 23 and bar 31. In order to project the path of travel of this apron closer to the nip between the front set of rolls l6 and 17, we have provided a member designated generally 35 and shown in perspective in FIG- URE 4 out of spring sheet stock and have shaped this member so that it will fit about the bar 31 along its upper surface 36, its back edge 37 and its forward tapered edge 38 but have projected a nose portion 39 of this memher so as to be an extension of the portion 4% which extends along the surface 36 toward the nip between the front set of rolls so that this nose portion 39 is closer to the nip than any part of the bar 31. Also this nose portion is raised slightly from the straight line of the surface 36 so as to follow the curvature of the portion 4-1 of the upper apron 30. Thus as a strand passes between the aprons and 32, there will be a control of the fibers to a point much closer to the nip of the front set of rolls than has heretofore existed. The upward curvature of the nose 39 also serves to increase the pressure of the aprons upon the strand at the nip adjacent this upward incline or bump in the path of travel of the strand which is desirable to press any straggling fibers back into the body of the strand. Just below the nose portion 39, the member has a rearwardly curved portion 42 so as to provide some clearance for the apron 32 after it leaves the nose portion 39. It will also be apparent that the top bar 29 is positioned relative to the nose 39 so that the upper apron is depressed into the upwardly extending arc of the lower apron 32.

Inasmuch as the nose portion 39 is close to the nip and presents the belt 32 close to the surface of the lower roll 17, it is desirable that there be a sufi'icient tension applied to the apron so as to prevent the apron from sagging and touching the lower roll 17, and a somewhat greater tension will be applied to the apron than has heretofore been applied. In the enlarged diagrammatic view shown in FIGURE 6 in dotted lines, there are illustrated the positions that the aprons have heretofore a sumed in their relation to each other and the lower front roll by the lower apron belling out as it moves about the curvature 55 of the bar which heretofore existed. This apron is curved in this way because of slight tension on the apron. There is also shown in this figure the nose 39 of the clip which projects the guide for the apron 32 closer to the nip between the front rolls 16 and 17 and in order to draw in the apron so that it will not touch the surface of the roll 17, we have increased the tension on the apron from that heretofore existing so as to bring the apron down in the position substantially as shown in the full lines in FIGURE 6, thus clearing the adjacent surface of the roll 17 in substantially the same amount as previously but drawing this apron in a tighter relation and one which follows more closely the shape of the bar. It will of course be apparent that this guide for the apron, instead of being a clip 35 secured on the bar 31 which is convenient for adapting frames already in existence to the new form, may be a solid bar 56 (FIG. 7) of a shape to incorporate the forwardly protruding nose such as shown at 39' in the bar 56 of FIGURE 7. The apron is tensioned through a tension roll 33 about which it passes this roll being revolvable upon a shaft 43 which projects outwardly beyond the roll 33 and is moved downwardly by spring arms 44 which have bearings 45 engaging the shaft 43 on either side of the roll to urge the shaft downwardly and tension the apron.

The spring arm 44 is bent into a rectangular shape at 46 so as to snugly embrace the tension rod 14. These arms may he slid along the arm 14 to an appropriate position depending upon the gauge of the machine. This bar 14 is provided at one end with a bore 47 into which the reduced end 48 of a rod 49 is positioned. This rod 49 as shown in FIGURE 2 is mounted in one of the arms 13 of the roll stand and is secured in one of the arms 13 of the roll stand by a set screw 50 (see FIG. 1) and serves to rotatably support the bar 14. The bar 14 is square in cross section and is reduced to a round section at 51 and threaded, and this threaded end is mounted in another roll stand arm 13 as shown in FIGURE 2 by reason of the threaded end entering a bore 52 and being held against movement out of any position to which it has been adjusted by a threaded collar 53 which is screwed from its position on the threads 51 into engagement with the arm 13 of the roll stand so as to hold the bar in any adjusted position.

The bar may be adjusted to tension a plurality of the tension rolls through spring arms 44 by engaging the square rod and rotating it, and then when the desired tension is applied to each of the aprons, the collar 53 may be screwed up against the roll stand arm 13 to hold it in this adjusted position.

It is found by use of this apparatus that the yarn which is formed has an increased breaking factor which may be illustrated by a set of tests which have been run and which are demonstrated as follows:

Regular Double Invention Apron Roth Spinning Test 1:

Yarn Size 119. 4 119. 6 Skein Break... 22.0 17. 8 Break Faeton. 2, 626 2, 128 Nuway Nuway 44, 8 45.0 50.4 45.0 2, 257 2, 025 A & E A & E

45.0 44. 4 581 2 47. 7 2, 619 2, A & E A & E

43. 8 43.0 56. 9 49.1 2, 490 2, 111 A & E A & E

TEST MADE AT MILL BY MILL PERSONNEL Saeo- Regular Lowell 2 Double Magne- Test 5 Invention Apron draft Roth Double Apron Roth Yarn Size 21. 7 21. 2 20. 7 Skein Break" 111. 8 93. 6 106.5 Break Factor 2,425 2, 000 2, 340 Uster 3 17. 6 19.2 18. 4

BREAK FACTOR COMPARISON Invention 23% better Invention 12% better Invention 27% better Invention 13% better Invention 17% better 1 Test No, 4 used some roving as Test No, 3 except that the spindle running the Invention" roving was used for the Regular roving and vice versa.

1 Saeo-Lowells newest double apron Roth system. This installation had all new parts from roller beam up. Invention and Regular" had old parts, the bottom steel rolls in particular being over 10 years old.

3 Measurer oi yarn evenness, Figures shown are for eoeilicient of variation, The lower the figure, the better the yarn,

In the above tests the Yarn Size is expressed as the count in the old cotton system wherein there are 840 yards in one skein and the figure given is the number of skeins in a pound. The Skein Break is the total pounds needed to break 840 yards in a skein of the ASTM standard. The Break Factor is the product of the Yarn Size and the Skein Break, this latter being the important figure in the test.

We claim:

1. In spinning, roving and like machines, a first set of upper and lower front rolls, a second set of upper and lower rolls back of the front rolls, an upper apron embracing the upper roll and a lower apron embracing the lower roll of the second set, an upper bar between the upper rolls of said sets about which said upper apron moves in a curved path, a fixed lower bar between the lower rolls of said sets embraced by said lower apron, said lower bar being provided with a nose projecting toward the lower roll of the first set and also projected upwardly with a rounded extremity over which said apron extends, said nose being so shaped as to project the path of travel of said apron close to said lower front roll and arcuately upwardly about the curved path of the upper apron at its forward extremity and means to tension said lower apron, said upper bar being positioned to depress the upper apron into the upwardly extending arc of the lower apron.

2. The combination of claim 1 wherein said lower bar has a portion extending substantially in a line which is a common tangent to the upper portions of both of the lower rolls.

3. The combination of claim 1 wherein said lower bar has a portion extending substantially in a line which is a common tangent to the upper portions of both of the lower rolls with its end nearest the front set raised above said line of tangency.

4. The combination of claim 1 wherein the nose on said lower bar is a separate member carried by said bar.

6 5. The combination of claim 4 wherein said separate member is of spring sheet stock clipped onto said bar. 6. The combination of claim 4 wherein said separate member has a portion extending substantially in a line which is a common tangent to the upper portions or" both of the lower rolls.

References Cited in the file of this patent UNITED STATES PATENTS 2,141,219 Martin et al Dec. 27, 1938 2,252,011 Liebaut Aug. 12, 1941 2,582,213 Walsh Jan. 8, 1952 2,633,607 Newbegin et al Apr. 7, 1953 2,944,299 Hampl July 12, 1960 FOREIGN PATENTS 891,472 France Dec. 11, 1943 405,713 Italy Sept. 3, 1943

Claims (1)

1. IN SPINNING, ROVING AND LIKE MACHINES, A FIRST SET OF UPPER AND LOWER FRONT ROLLS, A SECOND SET OF UPPER AND LOWER ROLLS BACK OF THE FRONT ROLLS, AN UPPER APRON EMBRACING THE UPPER ROLL AND A LOWER APRON EMBRACING THE LOWER ROLL OF THE SECOND SET, AN UPPER BAR BETWEEN THE UPPER ROLLS OF SAID SETS ABOUT WHICH SAID UPPER APRON MOVES IN A CURVED PATH, A FIXED LOWER BAR BETWEEN THE LOWER ROLLS OF SAID SETS EMBRACED BY SAID LOWER APRON, SAID LOWER BAR BEING PROVIDED WITH A NOSE PROJECTING TOWARD THE LOWER ROLL OF THE FIRST SET AND ALSO PROJECTED UPWARDLY WITH A ROUNDED EXTREMITY OVER WHICH SAID APRON EXTENDS, SAID NOSE BEING SO SHAPED AS TO PROJECT THE PATH OF TRAVEL OF SAID APRON CLOSE TO SAID LOWER FRONT ROLL AND ARCUATELY UPWARDLY ABOUT THE CURVED PATH OF THE UPPER APRON AT ITS FORWARD EXTREMITY AND MEANS TO TENSION SAID LOWER APRON, SAID UPPER BAR BEING POSITIONED TO DEPRESS THE UPPER APRON INTO THE UPWARDLY EXTENDING ARC OF THE LOWER APRON.

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