US2133034A - Apparatus for manufacturing woven drier felts - Google Patents

Description

Oct. 11, 1938. T. MILN-ES APPARATUS FOR MANUFACTURING WOVEN DRIER FELTS Original Filed Feb. 26, 1936 5 Sheets-Sheet l EIGJ INV EN TOR TODLMILNES ATTORNEY Oct. 11, 1938. T. MILNES 2,133,034

APPARATUS FOR MANUFACTURING WOVEN DRIER FELTS Original Filed Feb. '26, 1956 5 Sheejs-Sheet 2 1 m k w 'IIF w 'M- w INVENTOR TOMMIL ES ATTORNEY Oct. 11, 1938 N s 2,133,034

APPARATUS FOR MANUFACTURING WOVEN DRIER FELTS Original Filed Feb. 2e, 19% s Sheets-Sheet a FIG. 3

INVEN TO TOM MILNES ATTORNEY Patented Oct. 11, 1938 r p :1

- V UNITED :sT T'E PATENTOFFICE a claims. (o1. s9-291) This invention relates to the manufacture --or drier felts for paper makingmachines and particularly to the manufacture of cotton felts provided with an asbestos surface comprisingyarns composed wholly of asbestos. fibres or asbestos fibres twisted around a strengthening core-of cotton'or the like. The present application is a divisioiifof my c'opending application Serial No.

r 65,754, filed Feb. 26, 1936. w

V In the weaving of asbestos-surfaced drier felts" considerable difficulty is encountered owing to' th e difference in the tensile strengthof the cotton yarn used in the body of the felt as compared with the tensile strength ofthe yarns used in weav ingthe asbestos surfaceportion of the felt. The present practice is to apply the same tension to both yarns with the result that the required. tensioning of the cotton body yarns frequently results in excessive tensioning and breakage of the weaker asbestos yarns. Efforts to; overcome this difficulty have hertofore been directed toward increasing the tensile strength of the asbestos yarns and keeping the tensioning of the yarns within the maximum stretchability of the asbestos yarns.

According to the present invention the asbestos yarns, instead of being subjected to, the same tension as the cotton body yarns, are tensioned separately by a simple attachment capable of. convenient application to standard looms usediri the weaving of drier felts. With this arrangement the cotton yarn tensioning means may be adjusted to apply any desired tension to these yarns without danger of overtensioning and breaking the asbestos yarns. v

modifying the take up mechanism of a standard loom so that the woven felt is subjected to a calendering operation by the take up rolls as itpasses from the cloth rest of the loom to the winding roll of the cloth stand. 1 I

Proceeding now to aqmore detailed description reference will be had to the accompanying drawings, in which- 2 p i Fig. 1 is a perspective View of my improved yarn tensioning attachment applied to a standard loom used for the weaving of asbestos-surfaced drier felts. r a

Fig. 2 is a diagrammatic view of the yarn tensioning attachment appearing in Fig 1 Fig. 3 is a perspective view of the front portion of the loom'showing the take up mechanism by which the woven felt is subjected to a calendering operation in accordance with the invention.

Fig. 4 is a diagrammatic view of the take up mechanism showing the relative arrangement of the various takeup rolls over which the felt passes as it travels from the cloth rest of the loom to the winding roll of the cloth stand.

The asbestos yarn tensioning; attachment shown inFigs. 1 and 2 comprises relatively large upper and lower rolls 5 and a relatively small intermediate r0116. The asbestos yarns 1 are passed from 'the'supply spools 8*over a series of pre liminary guide spools-Swhich serve to straighten the yarns and prevent tangling thereof. From the guide spools 9 the yarns pass beneath a lower guide roll. {0. over the lower tensioning roll 5, V under and around the intermediate tensioning roll G' 'and thence over the upper tensioning'roll 5.1:From the upper roll-5the'yarns are passed over a roll. H tothe loom proper; The roll I I yarns passing th-ereover with theresult thatthe asbestos surface of the completely woven felt is .weight of the. rolls 5' is not sufficient to give the desired tension this brake may be adjusted to offer a certain amount of frictional resistance to rotation of the roll 6. It is also contemplated that the rolls 5 may be provided with frictionbrakes Another feature of the invention consists in similar to that associated with the roll 6.

. Figs. 3 and 4 show the take up mechanism by dips in a water tank [2 and serves to moisten the which the woven felt is subjected to a calendering operation as it comes from the loom. As here shown the felt A passes directly from the cloth rest l4 around the take up rollers I5, i6,'ll and 18 onto the winding roller19. The roll |6-is a 'large'hollow steam heated roll which rests on the roll l5 so that thelwoven' felt, in passing between theserolls; is subjected to a certain amount of pressure. Both of the rolls i5 and [6 are driven so that'they'have a slight slippage with respect to the felt A and thus produce a calendering effect. From the roll Hi the felt passes around the guide roll H to the roll l8 which is also a large hollow. steam heated roll. The roll I8 is driven at ahigher speed than the rolls l5 and I6 and has a greater slippage with respect to the felt so that'a further calendering effect is produced at roll l8. After passing around the roll la the felt is wound around the winding roller IE' which ismountedso that its trunnions '20 are free to slide in vertical guideways 2! provided in the side frames of the cloth stand 22.

vNo novelty is claimed in respect to the mounting and driving of the rolls- !5, I6 and except insofar as the driving gear, generally indicated at 23, is adjusted to drive the roll [8 at a higher 7 speed than the rolls l5 and 16. Aside from this i on the winding roller Hi. In ordinary practice the Woven felt coming from the loom is either wound on the roll or pleated to form a'boit. The roll or bolt is then subjected to a calendering operation in a' separate apparatus such as a stack calender or the like; By converting the take up mechanism into a calender the present invention eliminates the necessity of the very expensive stack calender heretofore employed besides elimmating the labor heretofore required in transferring the roll or bolt from the loom to the calender'which is usually in a separate department of the mill. I r V The method of supplying steam to the interior ofthe rolls l6 and I8isn0tsh0wh since this may be accomplished in accordance with the usual practice followed in introducing steam into, the interior of a holiow rotating roll. Preferably each roll is provided witha hollow trunnion to which asteam supply pipe is "connected by a suitable form of steam joint which permits the'necessary rotation'of the roll.

the lower of said superposed rolls Having thus fully described what I now conceive to be the preferred embodiments of this invention it will he understood that various modificationsmay be resorted to within the scope and spirit of the appended claims.

Having thus described my invention what claim is: e-

1. Apparatus for weaving paper drier felts comprising a loom equipped'with a combined take up and calendering mechanism comprising a pair "of superposed take up rolls around which the woven felt issuing from the loom is trained so thatIit is passed between the rolls from beneath the lower roll and then over the upper roll, a steam heated roll around which the felt is passed after leaving said first mentioned take up rolls and a vertically displaceable winding roll on which the felt is wound by the steam heated roll, means for driving said superposed upper and lower rolls' at different relativespeeds and means for driving the steam heated roll at a higher speed than either of said upper and lower rolls.

2. Apparatus as set forth in claim '1 in which is heated to serve as a calendering roll. V r 3. Apparatus for weaving paper drier felts comprising a loom equipped with the usual Winding roll'anda plurality of take up rolls arranged between the winding roll and. the'cloth rest of the lcom, said take up roll serving to pass the woven felt from the cloth rest to the winding roll, means for heating certain of said take up rolls and means for driving ,said'rolls sov that there is sufficient slippage betweenthe rolls and the felt to subject the latter to a calendering operation as it passes to the winding roll.

TOM lVl'I NES.

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