US2678475A - Top roll for drawing frames - Google Patents

Description

May 18, 1954 L. M. co'rcHE'r-r 2,678,475

TOP ROLL FOR DRAWING FRAMES Filed lay 14. 1952 `machinery, `frames, sliverand ribbon lap machines, comber Patented May 18, 1954 UNITED STATES PATENT OFFICE TOP ROLL FOR DRAWING FRAMES Louis M. Cotchett, Whitman, Mass., assignor to Textile Engineering Corporation, Whitman, Mass., a corporation of Massachusetts Application May 14, 1952, 'Serial No. 287,734

4 Claims.

. l u This invention relates to top rolls for textile more particularly for drawing draw boxes and the like.

` It is common practice to provide for these machines rigid one-piece top rolls having a single long boss and journals integral with the rolls, the

`or cap bars and against the weighting means and the uneven rotation and ensuing bad work caused thereby, resort has been had to anti-friction bearings of both ball and roller types applied to the journals `to support the saddles or hooks `and thus to handle the `substantial radial load `imposed by the weighting means. `these bearings usually are incapable of properly However,

providing for the end thrust which arises because such rolls are relatively long and seldom quite parallel to the bottom rolls and at right angles to the travel of the sliver, which departure from parallel acts to impart an endwise or axial crawl to the rolls. Anti-friction bearings for such rolls, therefore, must withstand both the normalradial thrust and also this axial thrust.

i There is not room available within thecap bar slots to house an `angular contact or combined radial-axial bearing of a size capable of enduring the loads imposed on it by the weighting hook and at the same time maintain the roll journal `of a diameter adequate to sustain this `load without intolerable distortion, For full anti-friction mounting, at least two separate bearings of angular contact type must` be supplied at each roll journal and spaced well apart with the weighting hook located betweeen them in order to hold the end cap or sleeve which houses the bearings in coaxial relation to the journal and prevent cramping ofthe bearings under the weighting load. But locating them inwardly of the cap bars shortens the working surface of the roll. l i

Therefore, the object of this invention is to provide a novel top roll of simple and compact construction which overcomes the above noted objectionable features and which can be substituted for prior plain bearing type `rollsin existing machines without change in the cap bars or other parts.

Another object of the invention is to provide an improved top roll which embodies few parts and yet is so constructed that it does not rotatably engage the bearing blocks or cap bars and weighting means.

Another object of this invention is to provide `an improved top rollwhich permits the greatest possible working surface of the roll but which has bearings so constructed as to be free of any limits on their ability to carry the load of the weighting means imposed by the size oi the cap bar slot.

In an effort to overcome the drawbacks above I have resorted to the shell type or loose boss top rcll` construction, in which a cot-covered roll `shell revolves upon an axle mounted in nonrotating relation in the cap bars of the frame. Satisfactory operation of shell type top rolls requires the use of anti-friction bearings between `the shell and the axle, but here also the heavy weighting which must be applied to the ends of these single boss top rolls and the resulting flexing of the axle cramps a ball bearing, causing rapid and destructive wear thereof, by tilting the cone out of axial alignment with the ball race.,

`The, space within the roll shell available to take the ball bearing is severely limited by the outside diameter of the cot, which is dictated by the `length of staple being drawn, and by the thickness of the cot wall required to give it the necessary resilience for proper drafting. Thus the ball bearing cannot be enlarged in size to in or needle type bearings, through offering increased load-bearing capacity without increase in outside diameter, cannot be used here because they will not withstand the end thrust arising as described, and are even more subject to cramping under flexing of the axle because of their greater axial extent.

l `According to the invention, I provide a single boss shell type top roll in which angular Contact ballbearings capable ci' accepting both radial and axial loads are employed, and increase the loadbearing capacity without increase of the outside diameter of the top roll by providing two such ball bearings preferably in reversed or back-to-back relationlocated in a recess in each end oi the metal roll shell. The non-rotating axle is preferablystiiened against flexing by increasing the diameter of the portion of its length lying between the pairs oi bearings to substantially the tial part of its length at the end of the sleeve adjacent a bearing.

2. A weighted top roll for drawing frames having in `coirioination a non-rotating axle, a roll shell, a pair of angular contact ball bearings disposed in reversed relation to each other within each end of the roll shell and supporting the latter rotatably upon the axle, the axle having abutment means within the roll shell engaging with the inner bearing of each pair, and end caps to be engaged 'by the Weighting means and :fixed on the axle, each end cap engaging the outer bearing of one pair.

3. A Weighted top roll for drawing frames hav- 4. A weighted top roll for drawing frames hav- 25 ing in combination a non-rotating axle, a roll shell, a pair of angular' contact ball bearings disposed in reversed relation to each other Within each end of the roll shell and supporting the latter rotatably upon the axle, the axle having a portion of increased diameter engaging the inner bearing of each pair, and end caps to .be engaged by the Weighting means and fixed on the axle, each end cap engaging the outer bearing of one pair, the portions of the end caps adjacent such rhearings being of thin-Walled construction throughout the greater part of the interval from the outer bearing to the point of engagement with the weighting means.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 352,739 Daniel Nov. 16, 1886 840,010 Ragsdale Jan. 1, 1907 1,484,045 Wardwell Feb. 19, 1924 2,355,511 Cobb Aug. 8, 1944 FOREIGN PATENTS Number Country Date 511,156 France Sept. 20, 1920 677,776 France Dec. 18, 1929 528,250 Great Britain Oct. 25, 1940

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