US1573777A - Center brace for drag rolls of looms - Google Patents

Description

Feb.16,1926. 1,573,777

` E. L. TINKHAM CENTERBRACE FOR DRAG ROLLS OF LOOMS Filed July 18' 1925 Fi g. 1.

Eugene I .TinKhum bya/m Patented F eb. 16, 1926.

UNITED-STATES PATENT oFFicF..-

EUGENE L. TINKHAM, or HoPEnALE', MASSACHUSETTS, ASSTGNOR To DRAPER Con- PoRATIoN, 0E HorEnALaMASsACHUsETTs, A ConPoEATroN or MAINE.

CENTER BRACE Eon DRAGv ROLLS Vor LooiviS.

Applicatonled July 18, 1925. Serialv No. 44,450.

To all whom t may oon-cern.:

Be it known thatI, EUGENE L. TINKHAM, a. citizen of the United States, and a resident of Hopedale, county of /Vorcester, State of' Massachusetts, have` invented an Improvement in Center Braces for Drag Rolls of Looms, of which the itollowing description, in connection with the Vaccompanying drawthe side frames or brackets extending from'y the Side trames of the loom. .'Ihewarp sheet passes from the warp beamk over the auxiliary roll, thence beneath and `around a substantial portion of the main drag roll and therefrom to the shedof the loom. The drag rolls act `to spread the warp` sheet out in proper 'form and apply the necessary drag or tension tothe 4warps in the weaving operation. These drag rollsare desirably, but not necessarily, in the form of hollow, cylindrical bars or rolls, and the tension of the y warps, particularly upon wide looms and when heavy warps are employed, tends to ilex'or bend one or both of the rolls so that an uneven tension is imposed upon the warps, which, of course, will produce a devfect in the weave.

The object of the present invention is to provide means for stiflening the drag rolls and thereby prevent any flexure of the same which wouldvproduce such an uneven tension tially horizontally upon the respective drag vr.rolls will becaused in a large measure to neutralize each other and thereby to aid in preventing lexure'of `the respectivedrag rolls. Y'

A futher object of the invention isto provide means for separating the warps ofV the approaching lead of the warp sheet so that comprise ythe warps will not kbe caught vbetween the brace and a drag roll.

A fut-her object of the invention is to provide a retaining device for the brace which will prevent it from moven'icnt relatively through the rolls. y f y f Other objects and features ofthe invention will appear moie fully from the following description and the accompanying drawings and will be pointed out in the claims.

Inas'much as the invention relates only to `thisparticular feature of the loom, it is necessary to illustrate and describe the con! struction of the loom onlyl in so far as it is particularly concerned with the bracing mechanism for the drag rolls.

In the drawings:

Fig. l isa plan view of the drag rolls of the loom Showing the Same Supported from the loom side with aportion of the warp sheet ruiming over the drag rolls.v

Fig. 2 is a vertical sectional view through the drag rolls showing in elevation a pre?Y ferred form of brace and retaining r,means therefor having guiding means for separating the warp sheet andpreventing the warp' from Vbeingc'vaught between the brace and a drag roll.

Fig. 3 is a similar view illustrating a pair ofy drag rolls in which the auxiliary 'roll is of smaller diameter than, the main drag roll. v f

Fig. L is an`A enlarged plan view ot a media-n portion of the drag rolls and the brace and spacing mechanism f embodying the present invention applied thereto. K

In the construction illustrated, a main drag roll 1 and an auxiliary r'roll`2, ar`

ranged in parallelism-therewith, are supported at their'ends upon the looin'side or a bracket extending therefrom in the usual manner. Theserv drag rolls may be,

and preferably are, of cylindrical form.

` The approaching lead 3 of the sheet of warp passesrfrom the warp beam upwardly over the auxiliary roll 2, thence downwardlyl 'beneath and Varound the main drag roll 1 and from which the warp sheet'runs in a lsubstantially horizontalY lead 4L to the shed' and thence to the tension and cloth rolls of the loom. In its passage around the auxiliary'and main drag rolls, the drag or tension necessaryA to the weaving operation y is imposed upon the warp and thewarp iary roll.

The object of the )resent invention is to provide means for preventing such ller;- ure of the main roll and, in fact, for preventing flexure of both rolls and also to maintain the rolls in parallelism against the tension of the warp sheet thus imposed up on the roll.

The preferred mechanism illustrated in the accompanying drawings comprises a brace interposed between the rolls, which acts both as a stifl'ener to the central portion of the roll and to maintain the same in parallelism. Any desired num` er of braces may be used, but ordinarily a ing member located centrally or .i tially centrally of the roll will be sutlicient for the purpose.

A preferred form of bracing member illustrated in the accompanying` drmvings comprises a metallic member or bloei-1 having` a flat upper surface G, which is located below a plane tangent to the upper surfaces of the rolls and which has downwardly converging opposite side faces 7 and 8 engaging and preferably complementary to the adjacent surfaces of the main a d auxiliary drag rolls forming a wedge-like construction. rllhe block 5 preferably extends bclow the axial plane of the rolls, as il trated in Figs. 2 and 3. By reason of construction,the forces which are impoeil upon the outer peripheries of the auf'lary and main rolls respectively act again.; each other and upon the brace, thus sulistantially overcoming the forces which otherwise would tend to flex the respective rolls along their intermediate portions and thereby produce a less tension upon the warps at the intermediate portion of the rolls than at the ends thereof'. By reason of the fact that the side faces 7 and 8 of the bloclz, which are complementary to the respective rolls, extend both above and below the plane of the centers of the roll, a material proportion of the resultant lines of force,

which act radially with respect to the points where the warps engage the respective rolls, pass into the brace in opposite directions and consequently neutralize each other. ln the operation of the loom, the tension of the warp acts more forcibly upon the main roll than upon the auxiliary roll and the unyielding brace which is located between these rolls also causes the auxiliary roll to reenforce or stillen the main roll against flexure.

In order to maintain the brace 5, which may be of relatively narrow width, against move nent longitudinally of the roll, a retaining member 9 is provided which prefing member 9 desirably is provided with' the guiding linger jfl, which extends across the path of the approaching lead t5 of the warp and is of sulii .ient width to separate the warps so that they will not be caught between the brace and a drag roll. ln order further to prevent the atching of the warps which pass over thel rolls closelT adjacent to the brace 5, the upper end portion lo of the brace which engages the auriliary draf)l roll, desir-ably is provided with bevelled faces 1G and 17 which will serve to guide any warps which might otherwise engage the brace along the rolls in such amanner thatthey will not be caught between the brace and the auxiliary drag roll.

rlhe terms brace or bracing member as employed in the specification and claims will be understood to include a device which acts both as a brace to the drag rolls and as a spacing means for maintaining the drag rolls in parallelism, lt will be understood that while a single bracing member of this character located centrally of the drag rolls is ordinarily suliicient, that any desired number of brac may be employed and that the bracing member may be of any desired form or construction. @lt will therefore be apparent that the present embodiment of the invention is of an illustrative character and is not restrictive to the meaning and scope of the following claims.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is:

l. A drag` roll construction for looms comprising a plurality of parallel rolls supported at their ends and rigid bracing means supported by said rolls and located between the rolls intermediate of the length of said rolls acting to stillen said rolls against tlexure by the warp sheet as it is dragged over said rolls in its passage from the warp beam to the shed.

2. A drag roll construction for looms comprising a main drag roll and a parallel auxiliary drag roll supported at their ends, a rigid brace supported by said rolls and having oppositely disposed surfaces complementary to adjacent'surfaces of the respective rolls located intermediate of the length of said rolls and extending above and below the horizontal plane of the axes of said rolls and acting to prevent flexure of ythe rolls by the warp sheet as itis dragged over said rolls and its passage from the warp beam to the shed. Y i

3. A drag roll construction for looms comprising a main drag roll and a parallel auxiliary drag roll supported at their ends, a rigid brace supported by said rolls and having oppositely disposed downwardly con-` verging surfaces complementaryh to adjacent surfaces of the respective rolls forming a. wedge-like construction located intermediate o f the length of said rolls and 'acting to prevent flexure of the rolls by the warp sheet asit is dragged over said rolls and its passage from the warp beam to the shed, and adjustable retainingmeans secured to said brace detachably engaging said rolls operable to clamp the wedge-like brace rmly upon the rolls. j

a. A drag roll construction for looms comprising a main drag roll and a parallel auxiliary drag roll supported at their ends, a rigid brace supported by saidV rolls and having oppositely disposed downwardly converging surfaces complementary to the segments of surfaces of the .respective Vdrag rolls and a retaining member adjustably securedjto said brace and engaging said'rolls and having a guiding arm extending beneath the forward roll and out of contacttherewith Vinto the path of the approaching lead of the warp sheet and acting to divide the warp sheet and prevent the warps from being caught between said brace and a drag roll.

5. A drag lroll construction for looms comprising a main drag roll and a parallel auxiliaryidrag roll supported at theirl ends,a rigid brace having its upper surface located belowl a plane tangent to the upper surfaces of said rolls and opposite side surfaces complementary to segments'of the surfaces f of therespective rolls and extending below the plane of the axes of said'y rolls and a retaining member spaced apart from the lower surface of said bracing member engaging the surfaces of the respective rolls, and

adjustable means connecting said spacing.

member and said bracing member.

o. A drag roll construction for looms com prising a maindrag roll and a parallel auxiliary dragroll supported at their ends, a rigid brace having its upper surface located below a plane tangent to the upper surfaces of said rolls and opposite side surfaces complementary to segments of the surfaces of the respective rolls and extending below the plane ofgthe axes of said rolls Yand a retaining member spaced apart from the lower surface'of said bracing member engaging the surfaces of the 'respective rolls,

adjustable means connecting said spacing member` and said bracing member, and a curved finger extending from saidretaining member in substantial parallelism with the under-surface of the auxiliary roll into the path ofthe approaching lead of the warp` i i y sheet, Y

7.V A drag roll construction for looms comn prising a main drag roll and a parallel sup'- plemental drag roll supported at their end, a rigid bracing member having its upper surface'located below a plane tangentto the upper surface of said roll andlconverging at its'end adjacent the supplemental roll 'and oppositey side faces complementary to segments of the surfaces of the respectiveY rolls and extending below the axes of said rolls and a retaining member spaced apart from the lower surface of said bracing memi

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