US2256193A - Top roll - Google Patents

Description

Sept. 16, 1941.

L, D. COBB 2,256,193

TOP ROLL Filed Aug. 10, 1939 2 Sheets-Sheet 2 I INVENTOR: LELAND 0. c055,

F DW

' HIS/ITTORNEY.

Patented Sept. 16, 1941 TOP ROLL Leland n. Cobb, Forestville, Conm, asslgnor to General Motors Corporation, Detroit, Mich, a

corporation of Delaware k 11 Claims,

This invention relates to top rolls for spinning frames, drawing frames and other like machinery wherein a thread of yarnis stretched and reduced in size bypassing it between top and bottom rolls that are urged into rolling contact.

' One. object of this inventiorris to provide an improved top roll ofsimple construction that has easily demou'ntable interchangeable roll members. Another object isv to provide a top roll wherein the roll members are supported by a single antifriction bearing so constructed that Application flugust 10, 1939, Serial No. 289,332

lubricant cannot escape from the bearing onto the v work engaging surfaces of the rolls.

To these ends, and also to improve generally upon devices of the character indicated, the invention consists in the various matters hereinafter described and claimed.

In the accompanying drawings: Figure l is a perspective view showing an application of this'invention;

of the top roll members It and the similarly positioned bottom roll members R. The antifriction bearing is so constructed that'iubricant cannotescape therefrom and onto the yarn engaging faces of the top and the bottom rolls or into the guides G where it would rapidly collect lmt and interfere with the top roll operation.

Referring in detail to the embodiment shown in the Figures-1 and 2 of the drawings, the shaft H. which forms the inner race member of the antifriction bearing [4, has the spaced'raceways I in which roll the balls I'I that are also in rolling engagement with the inner cylindrical wall I! of. the annular outer race member I8 Figure 2 is a longitudinal section through the top roll.

Figure 3 is a perspective view showing the oil hole closure member;

Figure 4 is a fragmentary view partly in longitudinal diametrical section through a roll hub;

Figure 5 is an end view of the roll hub;

Figure 6 is a longitudinal section through another embodiment of my top roll;

Figure 7 is a longitudinal section through an-v other embodiment of my invention;

Figure 8 is an enlarged sectional view of a diflferent roll member;

' Figure 9 is a fragmentary longitudinal section showing another embodiment of my invention;

Figure 10 is a fragmentary sectional view showing the structure for demountably securing the roll member of Figure 9 in position; and

Figure 11 is an enlarged cross section taken along the line lI-l| of Figure 10 and looking in the direction of the arrows.

Generally stated, in the embodiments here illustrated, a top roll unit, as '1, has quickly and easily demountable, interchangeable roll members, as Ill, spaced on a shaft, as H, rotatable in the end caps, as II, that non-rotatably engage and vertically slide in the slotted guides G which prevent skewing of the top roll T with respect to a drivernbottom roll 3 with which the top roll '1 is normally urged into rolling engagement. An antifriction bearing, as It, located on the shaft ll between the roll members it, is engaged under suitable yieldable pressure by an arm P so that a uniform controlled pressure may be applied that has the spaced peripherally disposed ribs 20 at each side of the pressure arm P. A pair of similar stepped sleeves 22 surround the shaft i I in closely spaced relation to the shaft and have their opposed, reduced inner ends 23 pressed into the outer ends of the race ring I! with their intermediate locating shoulders 24 abutted against the ends of the race ring it and their inner end faces 25 adjacent to the balls II. This construction provides a simple and efficient unit-handling shaft and bearing structure wherein the sleeves 22 effectively close the ends of the ball chamber 26 which may be chargedwith a suitable lubricant through one of the oil holes 21 that extend through the member It between the ball races. A resilient c-shaped closure member 28, slidably fitted in the peripheral groove .30 in the outer race ring it, maybe turned to provide convenient access to one of the oil holes 21, and the member 28 has a pair of inwardly directed depressed portions 3| arranged to slidably snap into seated sealing engagement with these holes 21.

The sleeves 22 are preferably composed of any suitable lubricant impregnated material, such, for example, as a molded fibrous material commonly known under the trade name of Textolite and impregnated with graphite. For clarity of illustration, the annular space between the sleeves 22 and the shaft is exaggerated, but this spacing is sufficiently small to normally preclude lubricant leakage therethrough. In the event that the antifriction bearing should break due to lack of lubrication, the sleeves 22 would act in the capacity of well lubricated plain bearings so that the shaft II and the rolls It would continue to freely turn until the antifriction hearing could be repaired.

The interchangeable roll members Ill have annular hubs 35 upon which are secured the replaceable tubular cots 38 that may be composed to the thread or yarn Y that is fed between each of rubber, leather, cork or other suitably yieldable material. I preferably removably secure the hubs "to-the shaft II at each sideof the hearing ll so that these hubs may'turn as a unit with the shaft. Abore 33 that axially ex- ,tends' through each hub 35, slidably receives the shaft II, and the inner and outside ends of this bottom of the counterbore 42 by an annular wall 46 through which the keyway passes. -A

portion of the wall 46 is struck into thegroove at 48 and a locating pin- 58, pressed into'a transverse bore in the shaft II, has a head 52 extending from the shaft and receivable in the groove 45 to axially position the roll member I8.

To demuuntably assemble the rolls on the shaft II, each hub 35 isslid over the shaft with the keyway 44 receiving the head 52, and when this head is received withinthe groove 45. the roll is turned on the shaft until the head enters into wedged driven engagement with the struck-in portion 48. It will be appreciated that if it is .desired to permit relative rotation of the roll members I8 on the be used.-

The end caps I2, which are generally cupshaped to rotatably receive the ends of the shafts shaft I I, the pins 58 need not 4 II, are preferably composed of a suitable, lubricant impregnated material, such as Textoli-te,

' and a C-shaped snap ring 54 removably engages within a ring groove 55 in the shaft and in an annular groove 56 in the end cap I2. One of the ends of the snap ring 54 is preferably v straightened so that the ring will resiliently engage the groove 56 and stay in this groove 56 when the cap is pulled off of the shaft II. The outer end of the cap I2 is enlarged and shaped as a polygon having the parallel opposed faces 5.! that slidably engage the side walls of the guides G. With this construction, in the event that two of the faces 51 become worn, the cap I2 may be lifted from its seated position and turned to locate two other faces in slidable engagement in the guide G. I t

Figure 6 shows another embodiment of my invention wherein the antifriction bearing of Figure 2 is replaced by a generally similar bearing construction which has only a single row of balls 68 rolling in a substantially centrally disposed raceway of the shaft 6 I and in an outer race ring 62 that receives the pressure arm P between the end flanges 63. The stepped sleeves 64 composed of a suitable lubricant impregnated material and generally similar to the sleeves 22 of Figure 1, close the ends of the bearing and surround the shaft 6| in closely spaced relation. The rolls 65 are provided with the usual tubular cots 66 mounted on the annular hubs 61 that are removably journalled on the shaft 6I at each side of the antifriction bearing, and these rolls, which are interchangeable and reversible, have the similar end counterbores 18 that respectively receive the inner ends of the end caps 'II and the ends of. the sleeves '64. The end caps II, which may be composed. of a suitable lubricant impregnated material as Textolite, are respectively journalled throughout their lengths on the ends of the shaft 6I and have the flat faces 13 for engagement with a side face of each guide G to bearing upon the outer race ring 9I freely slidable in the guides G. Each cap is removably held on the shaft end by a stud 14 provided with a head that overlies the end of the cap II, and a split post 15 on the stud extends into frictional engagement 'within an end bore .16 in the shaft 8|.

Figure! shows a slightly different embodiment herein my top roll construction differs only from the structure of Figure 6 in that the central antifriction bearing 88 is of the so-called "*needle type." In this structure, a large number of cylindrical rollers 8|, which are of a very small diameter as compared to their lengths,.are

in freely rolling contact with the shaft 82 and with a tubular casing 83 upon which the outer race sleeve 84 is mounted. The ends of the casing 83 are curled over at 85 .to axially restrict the rollers 8|, and these where are preferably provided with tapered ends to reduce their end frictional engagement with the casing. The sleeve 84 is flanged at its ends and the pressure arm P is received between these flanges.

Figure 8 shows a different roll member 81 which may replace the roll member 65. In this construction the roll 81 is shaped generally similar to the combined hub 61 and c'ot 66 but is entirely composed of a yieldable material such as cork, rubber or other suitable material that will meet the requirements of the cot 66'. If desired, the interior of the roll member 81 may be coated with a phenolic condensation product, such as Bakelite, or a similar material; which will strengthen'the member and aid its bearing properties on the shaft.

.Figures 9, 10 and 11 illustrateanother embodi be generally similar to that disclosed in the United States patent to Large, No. 1,917,988-and issued on July 11, 1933, has the pressure arm P top roll unit into the desired position. A pair of interchangeable roll members 92, provided with the usual yieldable tubular cots 93 are axially bored at 94 to demountably and respectively fit over the shaft 98 at each side of the bearing 89.

A pair of loking' sleeves 95, respectively pressed over the shaft 98 indriving engagement therewith at each side of the bearing 89, are each provided with an annular eccentric dovetailed portion 96 that is matingly received in demountable interlocking engagement within a generally similarly shaped eccentric annular recess 91 at the inner end of each roll member 92. Each recess 91 is of a sufliciently large size so that the dovetailed portion 96 may be entered therein when the eccentric mating portions 96 and 91 are coaxially aligned, and a relative turning of these interfitted parts enters them into a tightly wedged interlocked relation wherein the roll members 92 are constrainedto turn as a unit with the shaft nailed on the shaft ends, extend prevent rotationof these caps 'II while they are to urge .the

and rolls demountably secured of a suitable lubricant impregnated molded material, such as Textolite.

I claim:

1. In a top roll for textile machinery, a shaft, an antifriction bearing arranged to be handled as a unit with the shaft, roll members removably mounted on the shaft at each side of the bearing, and end caps demountably locked in journalled engagement with the ends of said shaft which project out of said rolls.

2. In a top roll for textile machinery, a pair of spaced rolls, a shaft axially extending completely through the rolls, means demountably locking said rolls against relative rotation and in predetermined positions on said shaft, an antifrictlon bearing arranged to be handled as a unit with the shaft between said rolls, and end caps demountably locked in respectively rotatable engagement with the ends of said shaft.

3. In a top roll for textile machinery, an antifriction bearing comprising an outer race ring, an inner race member extending through said outer race ring, rolling elements between said rings, and roll members removably mounted on said inner race-member at each side of the outer race ring.

4. In a top roll for textile machinery, an outer race member, an inner race member extending therethrough, rolling elements in rotatable engagement with said members. and lubricant impregnated sleeves respectively carried by the ends of the outer race ring and in closely spaced sur- 7. In a top roll for textile machinery, an outer race ring, projections on the ring for locating jecting therefrom, rolling elements between and in rotatable engagement with said race members, and a non-metallic lubricant impregnated sleeve pressed into each end of the outer race member L adjacent said rolling elements, the sleeve closely surrounding the inner race member and providing an emergency bearing in the event of breakage of said rolling elements.

9. In a top roll for textile machinery, a shaft, a pin laterally protruding from the shaft, a roll member demountable on the shaft and having a keyway and an annular groove for receiving said protruding portion of the pin, and an an rounding relation to,v said inner race member,

on the ends of'the shaft and extending nular wall in the roll at one side of said groove and having a portion bent into the groove for wedged engagement with the pin, whereby the roll is removably locked in shaft-driving relation.

10. In atop roll for textile machinery, a'pair of spaced rolls, a shaft extending therethrough,

- race ring, ashaft extending therethrough and assembled for handling as a unit.

6. In a top roll for textile machinery, an outer racering, a shaft extending therethrough and having a peripheral ball, groove, balls in the groove and rotatably engaging the race ring and said shaft, stepped lubricant impregnated sleeves pressed into the ends of the outer: race ring and in closely spaced annular relation to the shaft. on the shaft at each end of said outer race ring. 4

having a pair of spaced ball grooves, rows of balls in said grooves and in rolling engagement with said race ring, sleeve members substantially closing the space between the outer ends'of the race l LELAND D. COBB.

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