US1681887A - Stop motion for looms - Google Patents

Description

Aug. 21, 1928. 1,681,887

D. E. sKEDGELL STOP MOTION FQR LOOMS Filed June 20, 1927 imm/9%. y l

Patented Aug. 21, 1928.

UNiTED STATES PATENT OFFICE.

DAVID E. SKEDGELL, OF MILLVLLE, NEEV JERSEY, ASSIGNOR TO THE MILLVILLE MA 1\TUFACTURING COMPANY, OF MILLVILLE, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

STOP MOTION FOR LOOMS.

Application filed .Tune 20, 1927. Serial No. 200,121.

This invention relates to stop motions for looms of the Northrop type equipped with automatic lilling-replenishing mechanism, and more particularly to step motions modihed in accordance with a cri-'pending U. S. patent application, #109,212 filed by Aaron R. J ones under date of May 15, 1926; and which, has matured into U. S. Patent No. 1,644,647, dated October f1, 1927. The application referred to is directed toward provision of means in the form of a thrust bar adapted to be engaged by the tail loop of the filling detector when the latter is swung to an abnornial degree in the event of the presence of an obstruction larger than filling, such for example as an accumulation of lint or fly, before the reed of the loom, to effect direct actuation of the loom stopping mechanism without entailing successive operations of the filling-replenisl-iing mechanism as would ordinarily occur with the usual Non throp construction before the lloom is finally brought to a standstill. In the aforesaid application it will be noted that the inner eX- tremity or end of the thrust bar lies directly alongside the constantly reciprocating hool: element that cooperates with the detector, as a consequence of which contact is made with thetail loop of the latter only at'one region or point. By virtue of the yielding tendency of these Vcoordinated parts attendant upon wear I have found that the described construction of the thrust bar could not always be relied upon for positive actuation of the loom stopping mechanism under the stated conditions.

The aiin of my invention is to overcome the diiliculty pointed out so that the possibility of mal-operation of the various parts concerned in loom stoppage is absolutely precluded. l

One way in which the foregoing desideratum can be conveniently attained in practice will apparent from the detailed description hereinafter of the typical embodiment of my invention shown in the drawings, whereof Fig. I is a fragmentary plan view of a typical automatic filling-replenishing loom conveniently embodying the present in'iprovements.

Fig. I1 is a transverse sectional view of the organization along the somewhat staggered line l1, 11 in Fig. 1, and viewed in the direction of the arrows.

Fig. III is aV fragmentary detail plan, taken as indicated by the arrows I1I-1I1 in Fig il: and,

IV is a perspective view of the improved thrust bar for actuating the loom stopping mechanism.

In these illustrations, lOdesignates the lay of the loom carrying the reed 11 and moving toward and away from the breast beam 12 in the performance of its usual function. At opposite ends, the lay 10 supports the boxes 13, 1-1 between which the shuttle 15 is thrown bacl and forth in laying and filling thread across the face of the reed 11. Mounted on thevlay '10 adjacent the inner ends of the shuttle boxes 13, 11- are grids 16, 17 that respectively cooperate with the forks 18, 19 of the main and auxiliary filling detectors shown at 20, 21, these being' supported by the breast beam 12 in the customary manner. rl'he auX- iliary detector 21 is not especially concerned in the present invention and will therefore not be further referred to herein. The filling fork 18 of the main detector 2O is pivoted at 22 between the side bars of a slide 23 that reciprocates in a lguide 24C bolted to the breast beam 12. The filling fork 18 has a forwardly projecting square tail loop 25 adapted to cooperate with a hook element 26, the latter being pivoted tovan actuator 27 which extendsup through a longitudinal opening on the slide 23 and is rocked or vibrated on a fixed anis (not shown) in the lower part of the loom frame by a cam on the main cam shaft. In the present instance, the element 26 has two hooks 28, 29 occupying different vertical planes, thc lower hook resting on a supporting cross bar 30 of the slide 23 for confinement to definite horizontal movement. Normally the tail loop 25 of the filling detector 20 is swung to the horizontal full line position of Fig. 11, when filling is present `before the grid 16 on the lay 10 to enter the bight of the element 26 without encountering the lower hook 28. However, in the absence of filling, the detector tail loop 25 drops to the dot-and-dash line position as a consequence of which it is engaged by the lower hook 28 of the element 26, as the actuator 27 moves forward. lVhen such engagement takes place, the slide 23 is obviously carried along by the actuator 27 in opposition to a leaf spring 31 (Fig. I1), and the imparted motion transmitted through an arm 82 in the path of said slide, to a rock shaft 33 which operates the filling-replenishing mechanism, whereof a portion is shown at 34 in Fig. I. The described operation of the filling mechanism is attended by substitution of a new bobbin B for an exhausted one in the shuttle l5, in the well known manner. The loom is further equipped with a latch carrier 35 which functions to determine several such actuations of the fillingreplenishing mechanism before the loom is brought to a stop, said latch carrier having a series of depending cam lugs which cooperate with corresponding notches in the slide 23, permitting the latter to creep forward by successive increments and to so hold it while the latch 35 is temporarily retained; all in the manner characteristic of the Northrop loom. The latch carrier 35 also has, at one side, a special lug 36, which after several successive actuations of the slide 23. takes a position to the rear,

(left side in Fig. II) of the contiguous eX- tremity 37 of the knock-ofil lever which is pivoted at 38 to the breast beam 12. The other extremity 39 of the knock-off lever engages the belt shipper handle 4() associated ywith the loom stopping mechanism, said handle being normally held locked in a lateral recess 4l of a slotted motion-limiting eXtension bracket 42 secured to the left hand end of the breast beam l2, as considered in Fig. I. Thus, on the last actuation of the slide 23- attendant upon a predetermined number of omissions of the fillingthe special lug 36, of the latch carrier 35, will function to throw the knock-over lever 37, thereby releasing the shipper handle and effecting stoppage of the loom.

The 'description thus far sets forth the normal construction and operation of a i standard filling-replenishing loom which, in

the patent application hereinbefore referred to, is modified through the addition of means to effect automatic stoppage of the loom through tripping of the shipper handle 40, in the event of an abnormal obstruction before the grid 16 on the lay, without necessitating the successive aotuations of the filling mechanism 34, as above explained. This function is vested in a thrust bar 45, which extends parallel with theslide 23 and normally occupies the oblique position shown in Fig. II, by virtue ofl a pin stud and slot connection 46, 47 with a supporting bracket 48 bolted to the loom frame, and as a consequence of having its outer end under-cut as at 49 and resting upon the extremity 37 of the knock-off lever 37. The inner end of the thrust bar is bent sideways so as to lie alongside the hook element 2G, and is formed with a lateral extension or inverted U-shaped portion 50 to overhang said hook element withprovision of depending cheeks 5l, 52 that lap its sides, as clearly shown in Figs. II and III. Thefit of the.. extension 50 over the/hook element 26 is comparatively snug so that when the tail loop 25 of the detector falls into the notch of the hook 29 of the element 26, contact of the latter with both side cheeks 5l, 52 of the thrust bar 45 is bound to ensue, incidentally to forward movement of the slide 23. Thus instead of engaging the tail loop 25 of the detectorQO only at one point or corner as in the Jones application, my improved thrust bar 45 makes contact at both corners thereof thereby insuring positive functioning of the loom stopping mechanism. As a simple and convenient means to hold the thrust bar 45 against lateral displacement relative to the supporting bracket 48, I apply an ordinary Cotter pin 53 as a keeper at the outer end of the stud 46, as shown in Figs. I and II.

Having thus described my invention, I claim:

l. In an automatic loom with filling-replenishing mechanism, stopping mechanism, a filling detector to cooperate with a grid on the lay, a constant-ly reciprocating element with hooks in different planes to engage the tail loop ofthe detector in the absence of filling before the grid, also when said detector is swung to an abnormal extent due to the presence of an obstruction larger than the filling before the grid, the combination of a thrust bar lying in the path of the tail of the detector when the latter is moved to abnormal position and adapted to trip the loom stopping mechanism without entailing actuation of the filling-replenishing mechanism, said bar incorporating a .U-shaped portion fitting over the hook element for contact with the detector tail loop at more than onetpoint, thereby to insure positive actuation of lsaid stopping mechanism.

2. In an automatic loom with filling-replenishing mechanism, stopping mechanism, a filling detector to cooperate with a grid on the lay, a constantly reciprocating element With hooks in dierent planes to respectively engage the tail loop ofthe detector in the absence of filling before the grid, also when said detector is swung to an abnormal extent due to the presence of an'obstruction larger than the filling before the grid, the combination of a thrust bar lying in the path of the the lay, ,a'constantly reciprocating element with hooks in different planes to respectively v tail of the detector when the latter is moved engage the square tail loop of the detector in the absence of filling before the grid, also When said detector is swung to an abnormal extent Vdue to the presence of an obstruction larger' than the filling before the grid, the combination of a thrust bar lying in the path of the tail of the detector when the latter is moved to abnormal position adapted to trip the loom stopping mechanism Without entailing actuation of the filling-replenishing mechanism, the outer end of said thrust bar overhanging the hooked element and having depending cheeks to Contact with the square detector tail loop at both of its corners thereby to insure positive operation of the stopping mechanism,

4. The improved thrust bar for loom stop motions having a slot at an intermediate portion With one extremity laterally deflected and fashioned to invert U-sha-ped section and the other extremity under-cut, for the purposes specified.

5. As an article of manufacture, a thrust bar for loom stop motions having a longitudinal slot at an intermediate part with the rear end laterally bent and fashioned to pro- Vide parallel cheeks and the forward end under-cut7 for the purposes specified.

In testimony whereof, I have hereunto signed my name at Millville, New Jersey, this 14th day of June, 1927.

DAVID E. SKEDGELL.

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