US2490762A

US2490762A - Shuttle friction pad and assembly

Info

Publication number: US2490762A
Application number: US65766A
Authority: US
Inventors: James E Segee; Wilfrid J Gosselin
Original assignee: U S Bobbin & Shuttle Co
Current assignee: U S Bobbin & Shuttle Co
Priority date: 1948-12-17
Filing date: 1948-12-17
Publication date: 1949-12-06
Anticipated expiration: 1966-12-06

Description

Dec. 6, 1949 J. E. SEGEE ET AL SHUTTLE FRICTION PAD AND ASSEMBLY Filed Dec. 17, 1948 INVENTO 0 a o a I f v WWL ATTORNEYS Patented Dec. 6, 1949 James E; Segee; La'wrence; and wilfriiiflf Gbs: selin, Methucn, Mass., assignorsttflfl S. g &- Shuttle Cor,- Providence; RI -I.", a" corporafiori Bim- Application December 11, 1943; seriaiino'..ss;vesf

4 Claims; (Cl.139---2 1 7) This invention relates to. what are known? as friction pads such as are used in shuttles for looms, particularly those in which there is a shuttle block with a threading slot extending down from the top to produce an uniform friction or tension on the filling as the shuttle is picked backa'nd forth at a. very high speed. Such'friction pads are shown in patents to Park, No. 2,087,607; Nova, No. 2,027,752; Tebo, No. 2,107,917"; Tebo, No. 2,152,223; and Tebo, No. 2,170,541.

v Near the back of the threading slot, there are two opposed metal pads into which the filling, yarn slips, and then passesat every pick of the loom. Each pad has anearly fiat face alongv what we will call the friction or thread side and at the top there are wings each of which at the" end of a curved edge extend out and back towards and forming part of a holding side. bottom of each pad is a pinhole through which;

a pin passes, the hole being somewhat larger" than the pin to allow each pad to move ashort' distance transversely of the axis of the shuttle.

At the top, each pad is bent in a'curve outward" or towards and beyond the holding side in the form of a neck, and from this neck, as now made,

filling side of the other pad.

It is highly desirable that each pad'should be freely but not loosely movable transversely'and' its construction and supports should not permit oneor both to bind at their top or bottom.

It has been customary to make theears of" U-shape, but, as the bushing. or hole which each enters is round, they have a tendency to bind and the pin hole has been so punched that both its edges are right angles, thus leaving a sharp" edge at the inside and also at the outside rims sometimes with a burr. This constructionhas a'tendency to causethe pad to bind on its'bottom' as well as its top bearing.

Our construction prevents binding, and. cutting i.

of the'filling thread but permits the thread'to enter between the pads and to allow the force of the spring toproduce the same pressure at all times on the threadl'whether it is running from the'top 0f the thick'p'art'of the yarn package on the bobbin, from the middle, or from the bottom.

As the filling thread travelsth'rough between the pads at a very high speed and as occasionally N ear the;

verynecessarfth'at'there should be a; yielding of thepa-d's'tra'nsverselyi To accomplishla resilient; action there is usually a spring behind one or bothpadsso' that when a thinspot passes, the

friction wlll not'bel-too"mu'ch reduced' or when a" thick s'p'ot pa'sses; there will. be a yielding. The; purpose'i's toproduce' as neany s possible anZunl-' form friction on the yarmandto prevent it fromv unwinding" fromQthe'bObbin too" rapidly at one.

10* time, wherebydt'jmay form a loop whichmay catch onth'e nose of' the shuttle block, and from passihgtoo" rapidlyandtoo" easily out of the shuttle eye, thus making a. weak'spot or. a soft spot inthe clothi A On the*oth er'hand;;if thethread is held back too much, whenathick spot passes between the pads, orj'if 'the'friction and tension on the filling threadis too heavylthis may cause a break which is'ii'also highlyobjectionable;

Ourin'vention" consists of an improvement in;

each'- pad "whereby the ears at the" top formingf'a; siipportingihead'which engages the top. bearingf or'bushing instead 'of'b'eing U-shaped are curved" in acircle towards each' other in almostian O shape. and of forming the pinhole at the bottom as a tiibe' with" a rounded" edge on the thread. sldeiwhereby the yarn cannot catch on. any part oi'itf thejtub'e"proiectingion the holding side he lowjthe; headand" presenting a tubular contact The bearings at .top'andbottomare cylindrical each presenting; concentric concave to convex races; all ed'geswherebinding" mightoccur being,

rounded and;when installed, with a compressionspring between them.

In the drawings Fig. us a sectional elevational view on a" vertical plane extending longitudinally through a shuttle' block" and'with the different positions of the thread when passing through" the friction pad as'indic'at'ed;

Fig.2 2 'i's'a reanelevational view of ashuttle" bio k'witiiftwo friction pads" in place.

Fig: 3" is'an"elevationalview, very much enlarged;showingiasingle'friction pad of our constiuctiofiwitliiparts of the topbushing bearing.

andthe bottom pin bearing in position.

4'iisi'an'ielevati'onal View as from theright ofFig'. 3', but. on'afsinaller scalew'ith part of'the shuttle block; pushing, andibearing head. as well asttheb'arihgflfiil all indicated 5. an; elvatibnall viewfas from.v the. ,back but omitting the threading block-and ofFig; 4,"

i 5 I V Figl 6 i's'a sectional elevational view as on a a thin or thick spot appears in the thread, it is 55 vertical plane which extends transversely through 3 a block with two friction plates but a single spring.

Fig. 7 is an isometric view as from the friction side of a friction plate, very much enlarged.

In the drawings S represents a shuttle of a well known type in which there is a threading block L which is usually of metal and in which is a longitudinal threading slot 29 which extends down from the top lengthwise: of the shuttle axis. There are near the back of block L, one on each side of slot 29, oppositely disposed pads F, F,

each of which has at the top a neck 30 and a head 3| which head extends into a cylindrical head bearing hole 33 in a bushing 34 fixed in a round head hole 31 in one side near the top of the slot 29. Each of these pads F has a holding pin hole 22 near its bottom through which a holding pin P passes in a well known manner.

When there is no thread in the shuttle, the high, narrow friction faces engage each other from near the top to near the bottom. We will call this side the frictionside and the other side 2| the holding side.

Wings 23, 23 are bent back between the too and bottom each from an edge 24 of the face 20 towards the holding side. As shown in Fig. 2, behind each pad F is a compression spring N which is usually held in place as by a screw 35 which can be turned to increase or decrease the tension of the spring N on a pad-Fl. a

The

ears

32, 32 do not extend downward from a curved neck 30 in U-shape but curve down and around so that their free ends 35 almost touch to form an 0. The head 3| and ears therefore have nothing to catch or bind, but can move freely in the top bearing hole 33.

If the springs N, N, or, if a single spring is used, the spring N is positioned approximately midway between such a head 3| and the pin hole 22 through which a pin P fits with an easy sliding fit( each pad F can slide towards and away from the other or can rock enough to accommodate itself to any inequalities of filling thread and any position near the top, mid dle or bottom through which the thread passes V To prevent the threat from catching between the pin hole 22 and pin P, or being pinched as each pad F rocks, we round the inner or friction side edge 26 of each hole 22 onthe friction side 20 and this forms the base of a ,rim 25. This forms a rounded edge tubular pin hole.

The hole 22 is not punched but it and rim 25 are formed by a special tool and by an extrudingprocess so that this tubular pin hole, on its outer or holding side edge 21 does not have a sharp cutting edge, as it does when a pin hole. is punched, but is dull as shown in Fig. 3. However even if rim edge 21 is sharp, the rounded inner edge 26 prevents binding and permits a certain amount of rocking without wearing the pin P and even when the thread is threading or running from the bottom of a cone of thread near the bobbin tip as shown by the bottom, dotted lines T2 in Fig. l, the wear is much less than in the usual construction. When the thread runs anywhere between Tl and T2, the pads F, F move easily with or against a spring N with no binding and little wear as each pad F has a tubular inside bearing member 3| at the top and at the bottom a tubular outside bearing member 25 which are parallel and each of which fits its holding means, hole 33 and pin P, with a smooth running fit.

In a common or standard size of shuttle, the

diameter of the inside of hole 22 should be about .01 of an inch greater than that of pin P, and the outside diameter of head 3| is from .01 to .03 less than the diameter of head bearing hole 33.

We claim:

1. The combination in a shuttle provided with a threading block with a threading slot extending down from the top, having on one side near the top of a cylindrical head bearing hole and near the bottom, a holding pin; of a metal friction pad of thin metal which has a high, narrow substantially flat face on the friction side, wings between the top and bottom which extend back each from an edge of the flat face towards a holding side, a neck at the top which curves back at the holding side carrying integral downwardly extending cars which are curved toward each other to form a substantially tubular bearing head, and a tubular pin hole near the bottom of each pad with a rounded edge on the friction side and a rim projecting on the holding side parallel with the head, the edge of the projecting rim on the holding side being dull, so as to form a rounded edge tubular holding pin hole; with a compression spring positioned between the tubular bearing head and the tubular holding pin hole.

2. A metal friction pad for loom shuttles of thin metal which has a high, narrow substantially fiat face on the friction side, wings between the top and bottom which extend back each from an edge of the fiat face towards a holding side, a neck at the top which curves back at the holding side carrying integral downwardly extending ears which are curved toward each other to form a substantially tubular bearing head and a tubular pin hole near the bottom. of each pad with a rounded edge on the friction side and a rim projecting on the holding side parallel with the head, the edge of the projecting rim on the holding side also being dull so as to form a rounded edge tubular pin hole.

3. A metal friction pad for loom shuttles of thin metal which has a high, narrow substantially fiat face on the friction side, wings between the top and bottom which extend back each from an edge of the flat face towards a holding side, a neck at the top which curves back at the holding side carrying integral downwardly extending ears which are curved toward each other to form a substantially tubular bearing head and a tubular pin hole near the bottom of each pad with a rounded edge on the friction side and a rim projecting on the holding side parallel with the head, so as to form a rounded edge tubular pin hole.

4. A metal friction pad for loom shuttles of thin metal which has a high, narrow, flat face on the friction side, wings between the top and bottom which extend back each from an edge of the flat face towards a holding side, a neck at the top which extends back at the holding side carrying integral downwardly extending cars which are curved toward each other to form a substantially tubular bearing head and a tubular pin hole near the bottom of each pad with a rounded edge on the friction side and a rim projecting on the holding side parallel with the head, so as to form a rounded edge tubular pin hole.

JAMES E. SEGEE. WILFRID J. GOSSELIN.

No references cited.