US2027211A - Long draft spinning cradle - Google Patents

Description

Jan. 7, 1936. H L, THOMAS ETAL- 2,027,211

LONG DRAFT SPINNING CRADLE Filed March 21, 1935 INYLENEORS I Ma a ATTORNEYS Patented Jan. 7, 1936 UNITED STATES PATENT OFFICE Truslow, Whitinsville, Mass, Whitin Machine Works, Whitinsville, Mass., a

assignors to corporation of Massachusetts Application March 21, 1935, Serial No. 12,136

13 Claims.

The invention relates to long draft spinning framesin which endless aprons or belts are used for conducting theyarn fibers from one pair of rolls close into the bite of the next succeeding -15: pair, and more particularly to the cradles by which such belts are supported and guided, the object being among other things to reduce. to a minimum the wear on the belt edges incident to their rubbing on the cradle side walls, as well as generally to produce a more convenient and more. acceptable form of cradle, as will presently appear.

To this end the invention consists broadly in constructingthecradles in' front and rear sections or halves which can be clasped about the bottom draft roll to be thereby held in place in definite and proper relation to the other rolls, and

so as to: support the belts more positively than heretofore and guide them with minimum frictionandwear.

Fig; 1 of the accompanying drawing is a vertical cross section through a conventional long draft roll head to which the form of this invention which is at present preferred has been applied.

Fig. 2 is a side elevation of the cradle removed.

Fig. 3 is thesame opened.

Fig. 4 is aplan according to the arrow of Fig. 2.

Fig. 5 is a detail of the removable beltbearing bar.

Fig. 6 is a front elevation of Fig. 4 and Fig. '7 a section on line VII-VII of Fig. 2. In Fig. l' the back rolls are marked 1-2, the front or delivery rolls 3-4 andthe middle rolls to which the cradle is applied 5fi. The lower rollswill be understood in each case to be formed on continuous shafts extending the length of the frameand the upper rolls to be held in the usual capbars not shown and to be individually removable, all as customary in this art.

The new cradle as shown is formed of front and back sections hinged-toea'ch other on a transverse axis by the riveted hinge studs marked 1. The front section comprises two vertical side plates 8 rigidly connected to each other by a suitably riveted cross-bar member 9 to form by itself a rigid structure, such member being a round rod appropriately shouldered and firmly riveted 50 in place. This section carries the front bearings for the belts and which, in the case in hand, comprise a bearing bar It), for the lower belt I2, removably seated in the front-edge notches I l of the side plates 8 and a pair of opposed inwardly 55 projecting studs or fingers M respectively riveted to the plates to support the top belt l3. The latter can be removed from this hearing by passingiit through the open space between the opposed ends of the studs as described in application Serial No. 704,873, filed January 2, 1934, and s thereupon the lower belt can be separated from the cradle by withdrawing the bearing bar II) from its notches.

The rear section of the cradle is likewise formed of two vertical side platesmarked l5 and preferably these are rigidly united by a riveted cross member and preferably by one, as shown, which is fiat in section and serves as a roving-deflecting shelf marked l6 and which is provided with upbent arms I! at its ends to serve as roving guards. I5 These guards project sufiiciently from the side Walls H) to keep the roving from running off the edges of the belts, while the shelf makes the rollhead self-threading as will be understood. The outline of the belt is shown by the dotted line in Fig. 4. Both the shelf part l6 and the guide parts I! of this cross member are riveted to the'side plates I5 making the back section a rigid structure like the front.

The proximate margins of the two cradle sections are cut or shaped to fit around the bottom roll 6 or its shaft and likewise to form an upper notch suitable to receive the top roll. When the cradle is clasped around the bottom roll the respective side plate sectionsoccupy common vertical planes and meet edge to edge in fiush relation at least so far as concerns their interior faces. This results in producing surfaces for the belt edges to rub on which are continuously fiat and substantially uninterrupted, devoid of any jogs or shoulders or gaps in the paths of the belts, which, as we have found, accelerate the rate of wear, even when all exposed edges are rounded and smoothed to avoid it. The parting lines or meeting edges of the flush plate sections, on which they-separate when opened, are indicated in'Fig. 2 at l8 and I9, one being above the bottom rollandthetother below it, and both constitute merely cracks or fine crevices in the continuous edge-guiding surface, without any apparent effect on the belts, even after long usage. The belts may thus be used until they wear out or break down from other causes.

In order best to produce and maintain this important fiush relationship of the plate sections a hinge connection is used to connect them and which is best constructed by forming ofisets 20 on the rear plate sections, which offsets forwardly overlap the outer faces of the front plate sections, being pivoted to the latter by the hinge rivets I, at a level or location which is inside of the runs of the top belt so that the rivet heads are not touched thereby.

The placing of the top roll 5 in the top roll notch formed between the upper parts of the hinged plate sections, above the level of the hinge axis, locks the sections from being thereafter opened, which means that the top roll must be removed before the cradle can be disengaged from the lower roll. The sections can however be locked together in other ways, for example, the hinge ofiset 20 can be formed with a projecting nose as shown at 2| extended forward into such relation with the notch II, on one or both sides, that when the bearing bar In is pushed into the notch it rides under the nose 2!, thereby also looking the hinge. This latter method of locking is preferable because it looks the parts tighter and keeps the crevices at the parting lines l8 and I9 tightly shut and impossible to open under vibration or otherwise when the hinges have become limber from use. By thus producing edge to edge contact between the front and rear plate sections and properly locking them, the further advantage is secured that the circular aperture for the bottom roll can be made to fit quite snugly thereon, thereby improving the stability of the cradle, which has no other support except the two rolls. This keeps the belts in a more constant relation to the delivery rolls which is an important factor in good work.

The hinge offset 20 is desirably, though by no means necessarily, formed asaseparate part electrically welded to the stamped side plates, but in any case it is extended well to the rear of the parting line so as to contribute the strength of extra thickness to the narrow neck part of the rear side plate which lies between the top and bottom rolls, and at the same time afford a wider bearing by which the cradle rests and rubs on the bottom roll.

We claim; p

1. A cradle for long draft spinning frames having its side walls constituted respectively of front and rear plate sections adapted to clasp about a draft roll, said sections on each side of the cradle occupying a common plane and closing on each other in edge to edge flush relation to form a smooth and a substantially continuous belt guiding surface around said draft roll.

2. A cradle for long draft spinning frames having its side walls constituted respectively of front and rear plate sections having their proximate edges shaped to clasp around the bottom draft roll and. form a top notch to receive the top roll, said sections occupying a common plane and closing on each other in edge to edge flush relation above and below said bottom roll to form an uninterrupted belt guiding surface around said roll. 3. A cradle for long draft spinning frames comprising a front part composed of rigidly united side plates provided with belt bearings and a rear part composed of side plates pivoted to the front plates to swing respectively in the same planes and adapted to close about the draft roll in edge to edge relation to said front plates.

4. A cradle for long draft spinning frames comprising two parts hinged together to clasp about a bottom draft roll, each part comprising opposite side plate sections rigidly connected by a cross-bar member.

5. A cradle for long draft spinning frames comprising front and rear cradle sections hinged together with their proximate portions shaped to clasp around the bottom draft roll and form between them a notch to receive the top roll, said sections comprising opposite plate sections in common planes.

6. A cradle as described comprising front and rear parts hinged to each other so as to clasp the bottom roll and means for locking the parts together.

7. A cradle as described comprising hingedtogether parts adapted to clasp the bottom roll between them, one of them having a removable belt bearing bar in locking relation to the hinge.

8. A cradle as described comprising hingedtogether side plates shaped to close together, edge to edge in the space between the top and bottom rolls.

9. A cradle as described comprising front and rear plate sections together forming the cradle side walls, one of said sections having a thickened neck part between the top and bottom rolls, said thickened part being pivoted to the other section to form a hinge between sections.

10. A cradle as described comprising front and rear sections hinged to each other on an axis located between the runs of the top belt and adapted to clasp about the bottom roll.

11. A cradle as described comprising a front part composed of rigidly connected side plate sections and a rear part hinged thereto and composed of side plate sections rigidly united by a cross member, said cross member having a flat section serving as a'roving guide.

12. A cradle as described having a front side plate section and a rear side plate section together constituting one cradle side wall, one of said sections having an offset overlapping and pivoted to the other and holding both sections in a cormnon plane.

13. A cradle as described comprising a front part comprising side plate sections united by a cross-bar and carrying bearing means for the top and bottom belts, a rear part comprising side plate sections also united by a cross-bar member, an offset hinge connecting the front and rear sections and maintaining them respectively in common planes, said front and rear sections meeting edge to edge above and below the bottom roll and means for holding them against separa-

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