US1737690A - Filling fork for looms - Google Patents

Description

De- 3, 1929. K. J. uNwlN 1,737,690,-l

FILLING FORK FOR LOOMS Fild May 18. 1928 J0 l! .um U

Pfaff Jaffa fo Y Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE KENNETH J. UNWIN, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T CROMPTON & KNOWLES LOOM WORKS, OF WORCESTERj MASSACHUSETTS-A CORPORATION OF MASSACHUSETTS FILLING FORK FOR LOOMS Application filed May 18, 1928.

This invention relates to filling stop motions for looms and it is the general object of the invention to provide means for varying the pressure on the filling fork as the same moves toward detecting position to the end that a reduced pressure may be exerted on the warp when it is in contact with the filling.

In co-pending application Ser. No. 278,902 filed by Feehan there is shown a filling stop motion wherein weights are operative throughout a portion of the movement of the iilling fork toward detecting position to move said fork but the weights are arrested before the fork completes its motion so that the weight of the fork and parts associated therewith other than the weights exert the only force which is brought to bear on the filling. The construction shown in said application is subject to more or less rattling and derangement as the loom operates due to the fact that the weights are free to slide on the upright connector between the dagger carrier and the arm which controls the motion of the filling fork, and it is an important object of my present invention to provide a spring stressed device which will be under strain at all times so as to be held against undue vibration, said device being operative only during the rst part of thev downward movement of the filling fork and being moved out of controlling position with respect to the fork before the latter completes its detecting movement.

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 theaccompanying drawings, where two forms of my invention are shown,

Fig. 1 is a vertical transverse section through a portion of the loom having the preferred form of my invention applied thereto with the parts shown in knocking-off position,

Fig. 2 is a detail front elevation taken in the direction of arrow 2, Fig. 1 and showing the spring actuated arm in its lowest position corresponding to the llatter part of the motion of the fork as the same detects for filling,

Serial No. 278,893.

Fig. 3 is a view similar to Fig. 1 but with the spring arm in the raised position which it assumes at the beginning of the detecting stroke of the fork,

Fig. 4 is a horizontal detail section on line 4 4 of Fig. 3, and

Fig. 5 is a view similar to a portion of Fig. 1 showing a modified form of the invention.

Referring to the drawings, I have shown a breast beam having a bracket 11 in which is secured a bearing 12 for a shipper rod or shaft 13. Said rod has secured thereto an arm 14 which extends rearwardly and lies under a lug 15 cast preferably as an integral part of the knock-oft lever 16. The latter is pivoted as at 17 to a bracket 18 fast with respect to the breast beam 10. A lug 19 on'A the bracket 18 limits rearward movement of' the upper part ofthe lever 16 and deiines the position of said lever 16 when the parts are in normal position.

A cam plate 20 having a forwardly and downwardly inclined face 21 is adjustably secured by means of bolt 22 to the rear part of the bracket 18. Said cam plate cooperates with the dagger 23 held in a dagger carrier 24 which is pivoted as at 25 to a bracket 26 secured to the lay 27. The rear end of said carrier may be oounterweighted if desired as shown in Fig. 1.

A vertical connector C has the lower end thereof pivotally connected as at 28 to the carrier 24 and has the upper end thereof pivoted as at 29 to an arm 30 secured to one end of a stub shaft 31. Said stub shaft as shown in Figs. 2 and 3 extends through a pair of spaced bearings 32 formed as parts of the bracket 26. f

The fork element includes a cylindrical the high part of the cam plate 20. As the lay advances toward the breast beam the dagger will move down along the cam face 21 to depress the connector C. 'Ihis has the effect of moving the tines 36 from a raised position to a substantially horizontal position to engage the filling WV. If the weft supports the tines 36 further downward movement of the dagger 23 will be prevented and the latter will pass over the top of the knock-ottl lever 16 as the lay completes its forward movement.

Should weft be absent, however, there will be nothing to support the tines 36 and they will move into the well 38 to permit the dagger 23 to move downwardly a sufficient distance to have loom stopping engagement with the lever 16 as the lay nears the limit of its forward movement.

rIhe matter thus far described, except the particular form of connector C, is common to both forms of my invention, is of usual construction, forms no part of my present invention, and maybe substantially as shown in the following patents: Gr. F. Hutchins, 560,- 036; McGuinness, `1,223,703 and Gagnon, 1,243,831. The filling stop motion set forth specifically herein is that which is known in the trade as the No. 9 or Knowles center stop motion.

In carrying the preferred formof my invention into effect I provide resilient means for varying the forces which are brought to play on the filling fork as the latter moves downwardly, modifying the connector C and associating therewith a spring which is operatively related to said connector C throughout a portion only of the downward movement of the connector. Accordingly, I provide the connector C with an engaging shoulder and provide a spring member S having Va coiled part 5i which is located around a boss cast on the bracket 26. One end of the spring member extends horizontally as at 53 over the shoulder 50 and lug 54 cast on the bracket 26. The other end of the spring member extends downwardly as atand engages the left hand side of lug 54 as shown in Figs. 2 and 3, being preferably in' engagement with said lug preferably though not necessarily at all times. Cotter pin ID inserted through boss 52 prevents spring member S from lateral displacement. Shoulder 50 may have upstanding lip 50 to help guide end 53. Y

In the operation of thepreferred form of my invention, when the dagger 23 is in its highest position and the lay is in rearward position, shoulder 50 will be in engagement with the horizontal end 53 of spring S and and will hold the latter in the raised position away from lug 54, as shown in Fig. 3, thereby stressing said spring member. As the lay moves forwardly and the dagger starts to move down face 21 the connector C will move downwardly and with it the shoulder 50,

so that the end 53 will be able to follow the shoulder to insure proper starting of the downward movement of the tines 36. As the latter descend, however, the end 53 will come in contact with lug 54 and further downward movement of said end will be prevented.

As the dagger 23 continues to move down the surface 21, therefore, only such force will be brought into play to lower the tines 36 as results from the weight of the connector, dagger, dagger carrier and arm 30, together with the weight of the tines. In this way, the pressure exerted on the filling by the tines 36 is considerably less than would be exerted if the spring arm 53 were not arrested in its downward movement. The filling will therefore be spared any undue tensioning at a point intermediate the selvages of the cloth and formation of kinks or loose places in the cloth will be prevented.

It is to be understood that the weight of the parts permanently connected to the connector C exert a force of one magnitude acting to lower the tines of the fork toward detecting position, and it will be understood that the combined force exerted by the spring end 53 when in contact with the shoulder 50 plus the weight of the parts associated with the connector part C exert a force of the greater magnitude tending to move said tines into the well 38.

In the modified form of my invention shown in Fig. 5, wherein all parts except the connector and the parts associated therewith are the same as in the preferred form, the connector rod K has a head 7 O for the upper end thereof and may have the lower end thereof formed as at 71 for pivotal connection with the dagger carrier. A collar 72 loose on the substantially cylindrical connector K is held upwardly by a compression spring 73, the lower end of which may bear against the portion 71 of the connector. A cotter pin or other suitable stopping device 7 4 which is normally rigid with respect to the connector K limits upward movement of the collar 72. A stop 75 which is rigid with respect to Athe lay is so positioned as to engage the collar 712 and cause the latter to slide relatively to the connector K when the fork and connector K are raised. As the connector K rises while the lay is moving rearwardly the collar 72 will engage the stop 75 so that further upward motion of the connector will cause the pin 74 to move upwardly away from the collar and compress the spring 73. As the lay moves forwardly and the dagger moves down the cam face, the spring 73 exerts a force the effect of which is to lower the dagger and filling` fork. During this forward movement of the dagger the connector will descend and stop or pin 74 will approach and finally engage collar 72. Thereafter, further descent of the connector K will carry the spring and collar away from stop 75 yand the spring will have no further effect on the tines of the filling forli. In this way correct downward movement is insured at the beginning of the detecting stroke of the fork, but the additional pressure exerted by the spring 7 3 is relieved before the fork completes its detecting movement.

In the operation of the modified form, with the lay in rearward position the connector K will be in raised position with collar 72 held up against stop 75 by spring 73, and with cotter pin or stop fi spaced above the collar.

F rom the foregoing it will be seen that in each form of the invention I have provided a very simple spring actuated device which tends to vary the pressure brought to bear on the tines of the filling fork as they move toward detecting position. In both forms of the invention the spring is rendered ineffective to act on the fork during the end of the detecting` movement of the latter. I do not wish to be limited to the particular showings given herein as it is within the scope of my invention to provide a resilient device operative to cause motion of the fork during the first portion of the movement of the tines 36 toward detecting position and to be rendered inoperative during the remainder of the movement of the tines toward detecting position.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the artV without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

l. In a. filling stop motion for a loom having a lay, a filling fork normally in non-detecting position when the lay is in rearward position, a spring to exert a force on said fork tending to move the latter toward detecting position as the lay advances, and means to arrest motion of the spring relatively to the lay as the fork nears the end `of its movement toward detecting position.

2. In a filling stop motion for a loom hav- `ing a lay, a filling fork held in non-detecting position when the lay is in rearward position, a resilient means tending to move the fork toward detecting position when the lay is in rearward position, and means to render said resilient means ineffective to act on the fork as the latter nears the end of its movement toward detecting position, said fork being movable independently of the resilient means when said fork moves to indicate weft absence.

3. In a filling stop motion for a loom having a lay, a filling fork held in non-detecting poistion when the lay is in rearward position, resilient means normally under strain and tending to move the fork toward detecting position when the lay is in rearward position, and means to render said resilient means ineffective to act on the fork as the latter nears the end of its movement toward detecting position, said forli: being movable independently of the resilient means when said fork moves to indicate weft absence.

4. In a filling stop motion for a loom having a lay, a filling fork held in non-detecting position when the lay is in rearward position, resilient means having such relation with the fork that when the lay is in rearward position said means tends to move said fork toward detecting position, and means to disrupt the relation between the fork and resilient means as the fork approaches the end of its detecting movement.

5. In a filling stop motion for looms, a detecting element movable from non-detecting to detecting position, a spring, means to establish operative connection vbetween the spring and the detecting element when the latter is in non-detecting position so that said spring will tend to move the detecting element toward detecting position, and means to interrupt the operative connection between the spring and detecting element as the latter nears the end of its detecting movement.

6. In a weft detecting mechanism for a loom having a lay, a detecting element movably mounted on the lay to move from nondetecting to detecting position, a spring supported by the lay and having a portion to be in operative relation with respect to the detecting element when the latter is in nondetecting position tending to move said element toward detect-ing position, and a stop fixed with respect to the lay to engage said spring and prevent the latter from having operative connection with the detecting element as the latter nears the end of its detecting movement.

7. In a filling stop motion for a loom having a lay, a weft detecting element pivotally mounted with respect to the lay, a spring member supported by the lay, means to establish operative connection between the spring member andx the detecting element when the lay is in rearward position and tending to move the said element toward detect-ing position, and a stop fixed relatively to the lay to limit movement of the spring member and break the yoperative connection between the latter and the element as the lay nears the end of its forward movement and the detecting element approaches the end of its detecting movement.

8. In a filling stop motion for a loom having a lay, a weft detecting element pivotally mounted with respect to the lay and movable from non-detecting to detecting position as the lay advances, a spring having a coiled portion and an extending arm, a support for the coiled portion fixed relatively to the lay, means to establish operative connection between the arm and the element when the lay is in rearward position and the detecting element is in non-detecting position, and means fixed relatively to the lay to engage said arm to break the connection between said arm and the detecting element as the latter nears the end of its detecting movement.

9. In a filling stop motion for a loom having a lay, a detecting element movable with respect to the lay from non-detecting to detecting position, a spring member including a coiled portion and two extending arms, a stop means rigid with respect to the lay to engage both of said arms, and means to establish operative connection between one of the arms and the element tending to move the element y toward detecting position, said stop engaging said last named arm to break operative connection between saidlast named arm and the element as the latter nears the end of its detecting movement.

In testimony whereof I have hereunto afixed my signature.

KENNETH J. UNWIN.

Images