US1737689A

US1737689A - Shedding mechanism for looms

Info

Publication number: US1737689A
Application number: US210654A
Authority: US
Inventors: Turner Richard Greenleaf
Original assignee: Crompton and Knowles Corp
Current assignee: Crompton and Knowles Corp
Priority date: 1927-08-04
Filing date: 1927-08-04
Publication date: 1929-12-03
Anticipated expiration: 1946-12-03

Description

Dec. 3, 1929. R. G. TURNER SHEDDING MECHANISM FOR LOOMS.

Filed Aug. 4, 1927 Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE RICHARD GREENLEAIE TURNER, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMIPTON 8: KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A. COR- PORATION OF MASSACHUSETTS SHEDDING MECHANISM FOR LOOMS Application filed August 4, 1927. Serial No. 210,654.

This invention relates to improvements in shedding mechanism more particularly designed for weaving a name or fancy figure in such fabrics as towels etc. and it is the general object of the invention to provide means whereby a single pattern controlling actuating member such as a dobby jack may be made effective to control two different warp threads.

In the weaving of certain fabrics such as terry towels it is desirable to incorporate a name into the cloth to indicate ownership, the warps forming the name being controlled by mechanism separate from the main shedding mechanism which controls all the other warps of the fabric. With such auxiliary pattern mechanism as may conveniently be used it is not possible to get letters of sufficient height where one harness jack controls but one thread. The names usually run lengthwise of the fabric so as to be readable from one of the selvages and the warp threads to be controlled by the auxiliary mechanism may be either in the center or at one side of the fabric. It is common to run astripe of color, suchas blue, lengthwise through the center of the towel, the latter usually being white. 011 one side of the towel white letters will appear on a blue background while on the other side blue letters will appear. The name is not necessarily readable from left to right on both sides of the cloth, the letters on one side appearing in correct order but the letters on the opposite side usually appearing in reversed order. The towel will usually have two sets of piles for each letter, one set on each side, and the colors of the pile forming warps are alternated. It is an important object of my present invention to provide a simple means for causing one harness lever or jack to control a pair of pile warps so that one warp of one color will be raised while the other warp of another color will be. lowered.

It is a more particular object of my present invention to control two heddle cords by one harness jack, one of the cords being connected directly to the harness jack and the other cord being connected to a reversing device so that the cords will move in opposite directions. When weaving fabrics other than terry towels such an arrangement permits a finer effect in the weave than would be obtained if both warp threads and heddle corlds were connected directly to the harness ae r.

The heddle cords are usually provided with weights termed lingoes which act to lower the heddle cord when the harness jack moves to permit a down motion of the corresponding warp thread. When using the reversing device already referred to I find that the lingo or weight for the heddle cord attached to the reversing device serves as a counter weight to the harness jack and in order to offset the effect of this I provide a somewhat heavier lingo to have direct action on the harness jack. In this way the lifting tendency of the lingo connected to the reversing device is counteracted.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein a convenient embodiment of my invention is shown,

Fig. 1 is a front elevation of the upper portion of the loom having my invention applied thereto, and

Fig. 2 is an end elevation looking in the direction of arrow 2, Fig. 1.

Referring to the drawings it will be seen that I have indicated a part of the loom frame, preferably the arches, at 10 having mounted thereon an auxiliary shedding mechanism 11 which may be of the general form shown in patent to Gordon No. 1,060,977 issued May 6, 1918. Said auxiliary shedding mechanism 11 has a plurality of harness jacks or levers 12 which are raised and lowered by means of a pattern surface not shown herein but fully set forth in the afore said patent. It is sufficient for the purpose of my present invention to state that the harness levers 12 move up and down and under control of the pattern surface, the movements I weightor lingo 29.

In carrying my invention into eifect I secure a stand to the loom frame 10 and provide the upper end thereof with a horizontally extending stud 21 which is perpendicular to the harness jacks or levers 12. There are pivotally mounted on said stud a plurality of rock levers 22 which are preferably although not necessarily spacedapart a distance equal to the spacing of the levers 12 by washers 22.

A second bracket 23 is secured to the loom frame and has a horizontal slot 24 therein through which extends a bolt 25 by means of which depending arm 26 may be adjustably held to the bracket 23. The lower end of the arm 26 has secured thereto a small comber board 27 which lies substantially under the jacks 12 and rock levers 22.

The warp control is effected by means of heddle cords one of which is indicated at 28 as being connected directly to the corresponding jack 12 and extending downwardly through comber board 27 to have secured to the lower end thereof a relatively large The other heddle cord is indicated at 31 and has the upper end there of attached to the right hand end of the corresponding rock lever as viewed in Fig. 2, said second cord extending downwardly through the comber board 27 and having secured to the lower end thereof a relatively light weight or lingo 32; Said cords 28 and 31 are provided with warp eyes '30 and 33, respectively.

The left hand end of each of the rock levers 22 is connected by means of a link 34' to the corresponding jack or lever 12 as shown in Fig. 2. It is to be understood that there are as many harness jacks or levers 12 as there are rocking levers 22 in use, but it possible to employ other harness levers 12 to perform the functions set forth in the aforesaid Gordon patent without being connected to the rocking levers.

In operation the lovers 12 will move up and down in a predetermined order under influence of the pattern mechanism which is to determine the particular design to be w ven into the fabric. The relatively large weights 29 together with the weight of the lovers 12 hold thelatter normally in down position,- the smaller weights 32 being overbalance'd so to have a negligible lifting action on said jacks or levers 12. When any jack is lifted the corresponding roclring lever 22 will be rocked in a right hand direction as viewed in Fig. 2, the raising of link 34 permitting the associated weight 32 to rock the lever 22 to lower the corresponding warp eye 83. The harness lever 12 will remain up so long as it is held in that position by the pattern chain and when it again falls the weight 29 will act to lift the relatively lighter weight 32 so that there will be no interference with the normal down motion of a jack lever 12'.

From the foregoing it will be seen that I have provided a very simple mechanism wherein two warp threads may be controlled by one harness jack so that the threads may be moved in opposite directions by a single movement of the jack. It will further be seen that I have connected one of the heddle cords directly to the harness jack andthat' the other heddlecord for each pair is connected to a reversing motion. It will further be seen that the relation of the weights 29 and 32 is such that the harness jacks 12 are free to move properly without being interferred with by the lifting force exerted by the relatively lighter weights 29. While Ihave described the invention in connectionwith terry towels yet I do not wish to be limited to such fabrics, as the principle of the inven-.

the other, a pair ofheddle cords one of which is directly connected tothe harness lever, a rocking lever having'opposite'ly eX- tending arms, a link connecting said ha'rness lever and one of the armsof the rocking lever, the other of'the heddle cords being connected to the other arm of the rocking lever, and weighted means tending normally to lower said cords.

2'. In a shedding mechanism for a loom, a harness lever to move from one position to the other, a pair of weighted heddle cords one of'which is connected. directly to the harness lever, 'a 'rooking lever having oppositeiy extending arms, a link connecting the harness lever withoneof the arms, the other arm being-operatively related to the other of the heddle cords, whereby movement of the harness lever moves said heddle cords in opposite.- directions.

3.111 shedding mechanism for a loom, a harness lever to move from one position to the other, a heddle cord connected directly to the harness leverand having a relatively large weight thereon tending normally to move said cord downwardly, a secondheddle cord having a lighter weight tending normally to move said second cord downwardly, and ireversing mechanism operatively connected to the harness lever and said second named ,cord, whereby movement of said harness vlever fromone position to the other moves said cords; in opposite directions, the larger-wei ht of-the cord attached to the harness lever bal'ancingthe tendency of the lighterv weight to? lift the harness lever;

4. In shedding mechanism for a loom, a harness lever to move from one position to the other, a pair of heddle cords operatively controlled by the harness lever to be moved in opposite directions thereby, one of said cords being provided with a relatively heavy weight and exerting a direct downward pull on said harness lever and the other cord being provided with a relatively light weight, and means to cause the light weight to tend to exert a lifting pull on said harness lever, the heavy weight balancing the tendency of the light weight to lift the harness lever.

5. In shedding mechanism for looms, a pair of separate harness cords, means to cause either one of said cords to move against gravity when the other cord moves with gravity, a harness lever connected directly to one of the cords, a relatively heavy weight for the cord connected to the harness lever, and a lighter weight for the other cord, the heavier weight counteracting the tendency of the lighter weight to lift the harness lever.

6. In a shedding mechanism for looms, a pair of harness cords having their lower ends independent of each other, means connected to the upper ends of the cords to cause either cord to move in a given direction when the other cord moves in the opposite direction, a harness lever connected to one of the cords, weighted means connected to the last named cord which is attached to the harness lever, said weighted means tending to move the harness lever down, and means tending to lower the other cord.

7 In a shedding mechanism for looms, a pair of harness cords having their lower ends independent of each other, means connected to the upper ends of the cords to cause either cord to move in a given direction when the other cord moves in the opposite direction, a harness lever connected to one of the cords, and weighted means connected to the cords at the lower end thereof tending to move the harness lever down, said Weighted means including a heavy weight for the cord connected to the lever and a relatively light weight for the other cord.

In testimony whereof I have hereunto affixed my signature.

RICHARD GREENLEAF TURNER.