US1691124A - Attachment for looms - Google Patents

Description

Nov. 13, 1928.

A. PALMER ATTACHMENT FOR LOOMS "Filed Jag. 4, 192a Patented Nov. 13,1928.

[ e-UNITED STATES PATENT 5 OFFICE.

ALBERT PALMERfoF WORCESTER, MASSACHUSETTS, ASSIGNOR T CROMPTON &

KNOWLES LOOM WORKS, OF,,WORCESTER,

MASSACHUSETTS. I

MASSACHUSETTS, A CORPORATION 01 ATTAGHMENTFOR Looms.

A Application flled January 4, 1928 Serial NoQ 244,515

This invention relatesto improvements in devices for analyzing the picking motion of aaloom and it is the general object of the in vention to provide a meansto be operatedby the shuttle to determine when the latter passes a given p'oint in its flight,preferably the selvage of t'he'cloth. u

, In weaving one of the systems of threads is supplied bya shuttle which moves back p and forth to lay shots of filling} The shuttle is propelled by so-called picking mechanism which usuallyinyolves some form of cam 5 As ordinarily constructed the-picking motion.

ofthe loom is ratherharsh-in its actionand is found not to be entirelyuniform in its operation sofar as the timeof flight of the shuttle is concerned; It isan important object of my present invention to provide a. device to be applied to the lay and actuated by v the shuttle to detcrminetheltime at which {the shuttle passes anygiven fixed point.

It not infrequently happens that the width of a cloth to be woven von looms willivary weave a rath er wide cloth while at another time the same cloom will-beca1led upon to weave a narrower cloth, It is always desirable to have the sheds open aswide as possible when'the shuttle enters them so that a minimum of resistance may lie-offered the 1 flight of the shuttle." It will beseen that when r a loom is weaving wide fabrics thefshuttle vwill enter the shedearlienin the cycle of the pick than would be the case if the cloth were narrowj Itis desirable of courseto have a shuttle start its flight as soon possible and the lengthoftime required for the shuttle to pass through the shedis one thing determining the speed oftheloom; Inother words; if the shuttle can be started earlier in its flight it, can be expected toarrive earlier increased, It is so that "at one time a loom is called upon to in the box on the opposite side of the'loom,

and therefore the speed of the loom can be tion toprovidea device which will. record the point in the cycle of thepi-cl; at which the shuttle enters the shed, use of the device making 1 it possible to set the picking cam ahead somewhat .on narrower fabrics, the amount by which the cam may be set forward being determined by the device set forth herein. 1 i i In a loom'employing a plurality of shuttles suclnas a fancy box loom it may be desirable a further object 01 my invento confine the studies oithe picking mot-ion to one shuttle and. it is accordingly a further object of my invention: to provide means whereby a record may be made at the will of the operator sothat the use of the device can beconfined to one shuttle if desired. lVith these and other. objects in view which will appear as the description proceeds, my invention IQSldeS'lIl thecombination and an rangement of. parts hereinafter described and-set forth in the claims.

the accompanying drawings wherein a convenient embodiment of my invention is shown, p 1 Fig. is a top plan view of the invention s11 breast beam and the other part moving with the lay, i a

Fig. 2 is a sideelevation taken in the direc tron of arrow 2, Fig. 1

with certain parts in section, the lay being in Figs 3 is a vertical sectionon line 33 of Fig. 1,

' i Fig; 4- is a view similar to Fig. 2 but with the lay moved backwardly and the graph being described on the part beam being partly completed, and

Fig. 5' represents one of the sheets having marked thereon the curve orgraph produced by the device in conjunction with the shuttle.

In the drawings I have shown a loom frame 10 having a breast beam 11 and have also shown a lay 12 having a reed 13 and'a hand rail 14. The lay and parts supported thereby imove back and forth each pick of the loom by mechanism not shown butwell understood. The'shuttleS moves along the lay over the racfeplate 15 and has the rear side thereof normallyin contact with reed 13.

owing one part thereof supported by the its foremost position, v

I oo fixed to the breast The parts thus far described are of common construction and form no particular part of my present invention.

My improvements relate to means for determining the time when the shuttle S passes a given point along the lay and in carrying my invention into effect I divide the structure into two parts, namely the mechanism which is relatively stationary and mounted on the breast beam and the moving part which is supported by the lay and cooperates with the shuttle. A stand is secured to breast beam 11 by bolts 21 and has upstanding therefrom a pair of spaced walls 22 preferably perpendicular to the length of the lay and breast beam. A board 23 has projecting therefrom a pair of spaced guide rods 2% which pass through the walls 22, thereby guiding the board 23 and holding the same so that the face thereof shown in Fig. 2 will be substan tially vertical. One of said rods has adjustahly secured thereto a collar 25 positioned to engage one of the walls 22 to limit movemcn of the board while the other rod is surrounded by a comparatively light compression spring 26 interposed between one of the walls 22 and a pin 27 carried by the corresponding rod. The spring 26 acts normally to hold the board toward the adjacent wall 22 but by pressing on one of the rods 24 the board may be moved away from the walls until the collar 25 limits movement thereof.

The board 23 may be made of any convenient material such as wood and is adapted to receive a sheet of paper 28. ,Sa'id paper may be held in position bythumb screws 29 passing into the board. I do not wish to be him ited to the particular kind of paper employed.

The moving part of the deviceas previously stated is mounted on and moves back and forth with the lay and includes a bracket 30 secured as by bolts 31 to the hand rail l i. Said bracket has a vertical wall 32which is substantially perpendicular to" the hand rail and is provided with a slot 33 through which extends a stud 3a held in adjusted position in the slot by means of nut 35. A swinging arm 36 has a hub 37 through which the stud 34: extends to afford a pivotal mounting for the arm. The arm 36 carries a stop screw 36 which is positioned to engage a portion of the bracket 30 to limit movement of lever 36 in a counterclockwise direction as viewed in Fig. Ann 36 is yieldingly held with the stop screw against the plateby means of a light tension spring 38 attached to the arm as at 39' and l0, said spring 38' permitting upward movement of the arm 36. The horizontal arm ell of the lever 36 is provided with a hub l2 in which is adjus'tably secured a marking device 43 which may be a piece of any desired form-of stylus.

The lever 36 has a depending arm which has a rounded projection 51 normally pro crayon or may be connected to the bracket 30 as at jecting into the path of the shuttle S as shown in Fig. 2. The lever 36 is made light and may be stiffened by having a brace 52 extending between the arms -l1 and 50.

In the normal operation of the loom to which my attachment has been applied the spring 26 will hold the paper 28 out of reach of the stylus ormarking element at?) and as the lay moves back and forth said stylus and the lever will be moved correspondingly. hen

it is desired to make a graph showing the time at which the shuttle engages the rounded end 51 of the lever the operator will pusht-he board toward the stylus to assume the position shown in Fig. 1, preferably at the time when the lay is in its extreme forward position. As the lay starts to move reaiwardly the stylus will make a mark on the paper which will in etiect be an a o described. around the center of the lay. During the backward movement of the lay at a time when the lay is approximately midway between its forward and extreme rearward positions the picking motion not shown will be brought into action and the shuttle will be started in its flight cross the lay. As the shuttle travels its advancing nose will ultimately engage the rounded end 51 and swing the lever 36 around the stud 84 against the action of the light ten sion spring 38. In doing so the marking element 4L3 will describe a path which will be other than an arc concentric with the axis of the lay. Asthe shuttle passes beyond the rounded end 51 the spring 38 will move the lever back to its normal position relatively to the hand rail and as the lay arrives at its rearmost position the stylus will again be found describing an arc concentric with the center at the lay. On the return movement of the lay a corresponding operation of the device will take place by the rocking of the lever 36 relatively to the hand rail but will take place at a different time in the pick inasmuch as the shuttle must pass through the shed before engaging end 51 of lever 36. By referring to Fig. operation of the device canbe understood. 1 have shown a card 28 having thereon a mark or graph having an arcuate portion 60 which is substantially concentric with the center of the lay. This portion 60 of the graph corresponds to the rearward movements'of the la y when the latter is forward of its mid position. By means of vertical dot and dash lines in Fig. 5 I have indicated the three principal positions the lay occupies when moving from its forward to its rear-most position. The line FC which marks the beginning of the left hand end of the portion 60 of the graph represents the so-called front center position of the lay when the latter is in its foremost position. The second dot and dash line markedTC represents the so-called top center which corresponds to the position occupied by the lay when the latter is approximately 'one-halffthe way between its foremost andlts real-most position. The th rd line BO represents the so-called back center or the extreme rearmost position'which the lay assumes. I I I II I It is usual practice to setthe picking cam of the loom so that it will begin to move the picking motion and shuttle when the lay is on so-called top center or midway between its extreme forward an d rearward position with the laymoving rearwardly. It takes a small fraction of a second for the lost motion of the various connections'between the cam and the shuttle to be taken up,after which the shuttle will start to move out of the box. B y having the rounded end '51 located approximately over the selvage of the cloth it ispossible'to determine with considerable aceuracy'whatthe position of the lay is at the time the shuttle enters the sheds defined by the warp threads. As shown in'the graph illustrated in Fig. 5

the shuttle enters the shed when the lay approximately onefourth ot' the distance between topcenter and back center and the graph shows a correspondingouick upward trend 61. After the shuttle has passed the device spring 38 will return the marking ele- I ment 43to its normal position and the graph will return by means ofline to a continuation 63 of the beginning of the graph shown at The distance between the ascending and descending lines 61 and 62,respectively,

will depend some-what uponthe length of the flight of the shuttle in but one direction, but it is to be understood that two devices may be used if desired, one at each side of theloom,

and that the marking element 43 may be utilized to register the point in the cycle of'the loom when the shuttle emerges from the sheds as well as the point where it enters the sheds.

Tests made with the device set forth herein have enabled me to alterthe picking motion of a loom to which the device has been applied so as to ease the actionof the shuttle and to improve pickingconditions. By the use of my present device the weaver can tell I by measuring thepoint at which the shuttle engages the recording lever 36 what the proper relation should be between the picking motion and the harness motions of the loom.'f It is undesirable of course to have the harnesses open any-appreciable length of time beforethe shuttle can enter theshed as this represents a wasteof time. It is likewise undesirable to have the shuttle enter the sheds before the harnesses are sufficiently open to ermit an eas assa e of-the shuttle other wise the power of the pick must be increased beyond a desirablepoint merely to overcome friction between tl e warp threads and the shuttle.

From the foregoing it will be seen that I have provided a very simple device for deterinining the time in the cycle of the pick of a 100111 at which the shuttle passes any selected point and that by the use of the device the weaver may know by simple calculation from the chart or graph secured whether the picking motion and harness motions are properly related so as to providebest weaving condi tions.

I Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the "invention and I donot wish to be limited to the details herein disclosed, but what I claim is: I I I I s 1. A device of the class described for a loomhaving a relatively fixed breast beam and alay moving toward and from the breast beam and a shuttle to move along the lay, a

pair of cooperating indicating elements one of WlllCl'l is supported by the breast beam and therother of which moves wlth the lay, and

means actuated by the shuttle to cause relaion supported by and movable relatively to the lay to have engagement with the means on the breast beam, and means actuated by the shuttle as the latter is in flight to cause relative movement between the means and the marking element in addition to that imparted thereto by the lay as the latter moves relatively to the breast beam.

7 3. A device of the class described for a loom having a relatively fixed breast beam and a lay moving toward and from the breast beam and a shuttle to move along the lay, a

pair oi oooperating recording devices one of which is supported by the breast beam and theother of which motes with the lay, the device moving. with the. lay being relatively movable with respect to the latter and being movable by the shuttle while the latter is in. flight to impart to said device supported by the lay a movement in addition to that caused by the lay as the latter moves relatively to the breast beam.

4. A'device of the class described for a loom having a relatively fixed breast beam and a lay moving toward and from the breast b'iam and a shuttle to move along the lay, a relatively fixed surface to have a graph marked thereon, a marking element supported by the lay to have engagement with the surface, said element capable of receiving two kinds of motion, one motion being imparted thereto by the lay alone as the latter moves relatively to the breast beam and the other motion beingimparted thereto by the shuttle and lay combined as the lay continues to move relatively to the breast beam.

5. A device of the class described for a loom having a relatively fixed breast beam and a lay moving toward and from the breast beam and a shuttle to .move along the lay, means supported by the breast beam presenting a surface to receive a mark, a lever supported by and pivotally mounted with respect to the lay, a marking element carried by the lever, and yielding means to hold said lever in normal position, said lever being engaged by the shuttle while the latter is in flightto move the lever against the action of the yielding means, whereby the marking element will produce a mark on the first named means corresponding to the time said lever and shuttle engage each other.

6. A device of the class described for a loom having a relatively fixed breast beam and a lay moving toward and from the breast beam and a shuttle to move along the lay, a

recording member supported by the breast seam and movable from non-recording to recording" position, and means supported by the. lay and deriving movementirom the shuttle when the latter is in {light to make a record upon said means to indicate the time in the cycle of the loom when the shuttle engages the device.

7. A device of the class described for a loom having a relatively fixed breast beam and a lay moving toward and from the breast beam and a shuttle to move along the lay, a recording member supported by the breast beam, and means supported by the lay and deriving movement from the shuttle when the latter is in flight to make a record upon said means to indicate the time in the cycle ot' the loom when the shuttle engages the device.

In testimony whereof I have hereunto affixed my signature.

ALBERT PALMER,

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