US2421539A - Loom reversing mechanism - Google Patents

Description

June 3, 1947. I F. v. CLARKE 2,421,539

I LOOM REVERSING MECHANISM Filed Oct. 12, 1944 2 Sheets-Sheet 1 INVENTOR fire? (have.

BY h. ra

ATTORNEY 2 Sheets-sh et 2 F. v. CLARKE LQOM REVERSING MECHANISM Filed 001... 12, 1944 June 3, 1947.

Patented June 3, 1947 LOOM REVERSQWG MECHANISM Farrell V. Clarke, Uxbridge, Mass., assig'nor to Uxbridge .Worsted Co.,. Inc., Uxbrid a corporation ofMassachusetts ge, Masa,

Application October l2, 1944, Serial No. 558,314

'21 Claims This invention relates to a loom construction and control means for. certain. loom parts and means for backing up certain looni" parts and means for relating this movement with positive warp beam drive means.

Heretofore in the operation of a loom, when one or more filling threads broke, it' has been necessary for the loom attendant to disconnect the main loom drive connection to the cloth roll and the head motion including the means for controlling the weaving pattern, thereby reversing the drive connection between said cloth roll and the head motion, and, after reversing the pattern chain, to manually actuate the head motion to let-off the cloth roll, and to retract the pattern control means, and. also to manually rewind the warp beam to take up slack in the warp and to condition the warp to receive one or more new filling threads to replace the broken thread or threads. These manual operations were arduous, due in part to the position of the handwheel for operating the head motion, and the accuracy of these manual adjustments depended for control entirely upon the skill and experience of the loom attendant who was without any dependable measure of how far the warp needed to be taken up on the warp beam in order that a tension substantially equal to that maintained on the warp threads during preceding and following portions of the weaving operation would be maintained during the replacing of the broken filling threads.

Accordingly an object of'the invention is to provide an improved method and means for driving the head motion, so related to means for driv ing the warp beam in reverse that a tension substantially uniform with that existing prior to the breaking of the filling threads will be provided during the backing up of the warp and replacement of the broken filling threads.

Another object of the invention is to provide non-manual means for reversing the loom head to obviate the necessity of performing this operation manually.

Another object of the invention is to provide power drive means for driving a loom head to reverse the pattern chain and cloth roll andcontrol means for limiting the said reverse action.

Another object of the invention is to provide control means whereby the loom head drive may be utilized to retract the pattern chain and to let off woven cloth and whereby means for taking up the warp to compensate for said letting off of woven cloth and 'to maintain the'warp tension operations. The invention includesmower driven 2 within a desired rang may into action.

Otherobjects of the invention will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, arrangements of parts, and in the several steps 'and relation and order of each of said steps to one or more of the others thereof, all as will be pointed out in the following description, and the be related and called scope of the application of which willbe indicated in-the following claims, The invention will best be understood if the following description is read in connection with the drawings, which show a practical embodiment of the invention, and in which,

, Figure 1 is a side elevation of a portion of a loom showing the head motion cylinders and drive means therefor;

Figure 1a is a detail view in perspective showing a 'loom warp beam, having independent drive means, and indicating the warp, a whip roll, and an electric switch controlled by the position of the whip'roll; v

' Figure. 1b is a detail planview taken on the line i -i of Figure 1.

, Figure 2 is a diagrammatic and schematic representation of an electrical circuit arrangement showing diagrammatically the relation of the electrical control features to the schematically represented mechanical features of the entire system of control.

As shown in Figure 1 a vertical drive shaft 10 for the head of a loom, is supported at its lower end in'a bearing l0"- provided by an horizontal bracket arm II. Shaft [0 adjacent its upper end is supported in a bearing provided by the bracket I2 extending from the loom frame member [3, which also provides bearings for one end of shafts 40 I4 and i 5, which are arranged one above the other, and which are supported at their other ends respectively, in bearings provided in loom frame member 16. Aiiixed on shaft I4 is a box cylinder gear I l, and a harness cylinder gear l8. -Similarly supported on shaft I5 is a bottom box cylinder gear I9, and a bottom harness cylinder gear 20. At the inner ends of shafts and I5 respectively are bevel gears 2i and 22 which mesh with gears 23 and 24 respectively, fixed to shaft 10 adjacent its upper end, to rotate the chain cylinder gears i1 and I9 and the head motion cylindergears l8 and 20.

Fixed at the front end. of shaft I4 is a hand wheel 25, by which, 83091111118 to previously prevailing practice, the head of the loom has been manually driven to reverse the weaving action when required, as for replacing broken filling threads or to level the harnesses when warp ends are broken. It will be noted that the hand wheel 25 is positioned highup at the top of the loom structure and it is thus diihcult, for many operators, and particularly women, to reach the hand wheel 25 and rotate it for driving the head motion.

Shown at the front end of shaft I is a train of gears indicated generally by the numeral 26, which controls the direction of drive of pattern chain driving gear 21. Said system of gears is controlled by key 28 which for forward drive is in the full line position shown in Figure 1. When key 28. is in reverse position, as shown in dotted lines in Figure l, the pattern chain is set to move rearwardly, as for the replacing of broken filling threads.

Shaft I0 is driven for normal forward drive of the loom head from main loom shaft 29, having thereon gear 30 which meshes with teeth 3| cut in the periphery of bevel gear 32, which in turn meshes with bevel gear 33, mounted so that it is freely rotatable on shaft 10, and having a collar 34 provided with the bores 35 engageable by pins 36, carried by the clutch member 31 splined to shaft l0. Clutch member 31 is provided with a groove 38 which receives the forked end of lever arm 39 which is mounted on fixed pivot 39 and is attached to, and moves with, link 40. The position of link 40 is controlled'by slide'able rod H6, having at its front end a shifting lever 42, pivoted to the loom frame It and connected as at 43 to rod H6. In Figure 1 hifting lever 42 is shown. in its rear position with clutch 31 disengaged from the forward drive means of shaft H). In this position of clutch 31, sliding collar 44, the position of which is controlled by the position of clutch 31, will be in its upper position, and ear C will be driven to let off cloth from the cloth take-up roll. Sliding'collar 44 is splined on shaft [0 and comprises the upper bevel gear .45 and the manually rotate warp beam B in reverse as by I caused by the backing up grasping the heads h of the warp beam, until, in the operators judgment, the slack in the warp, of the warp, was taken up and the tension which the warp had before the breaking of the. filling thread or threads, was restored. The control of the warp tension was thus subject to the personal equation and was dependent upon-the guess or ator. Since failure on the part of the operator to restore a warp tension to that which existed prior to the breaking of the filling thread or threads results in non-uniform weaving during replacing of thefilling threads, thus lessening the quality of the cloth, it has heretofore been necessary to have experienced operators in attendance upon looms during their operation. By my invention means areprovided for driving the loom head to reverse the weaving action by non-manual means, and preferably for a predetermined amount, and for relating the control means there-s for to warp tension control means, such for example as the means set forth in co-pending applilower bevel gear 46, spaced apart a distance slightly greater than the diameter of the bevel gear 41 mounted on shaft 48, which is supported at one end in a bearing provided in vertical bracket arm H Which of gears 45 or 45 is meshed with gear 41 depends upon whether clutch 31 is in its upper or lower position, as sliding collar 44 moves in unison with clutch member 31 and is interconnected therewith through pivoted lever arm 39, link 49, and arm mounted on fixed pivot 5|, the forked end of which engages in groove 52.

Also mounted on shaft 48 is a gear 53 which drives a gear 53 meshed at the rear of said gear 53 and which is attached to shaft 54 on which there is a worm 55 which engages and drives the gear C of the cloth take-up roll. At the forward extremity of shaft 54 a hand wheel 56 is shown by which, according to prior art practice, gear C may be manually rotated in reverse to let off cloth from said cloth take-up roll, as for backing up the warp to replace a broken filling thread, and also according to prior art practice warp beam B, shown in Figure la, is manually rotated to take up the warp.

For backing up the warp in this way it was necessary for the operator, after first shifting lever 42, to disconnect upright shaft ID from its driving means by disconnecting clutch 31 from driving gear 33, and after shifting key 28 to effect reversal of the pattern chain drive, to reach up to hand wheel 25 and-rotate it manually a sufiicient distance to move the warp and pattern chain cation Serial No. 558,313, filed October 12, 1944, whereby the tension of the warp may be continuously and automatically controlled during rearward movement of the warp, thus eliminating the aforesaid manual operation, and the personal equation in the tensioning of the warp, with the result that a higher and more uniform quality of cloth is obtainable, even with loom attendants not necessarily experienced in weaving.

In accordance with my invention I provide means including control means, such as are included in the electric circuit illustrated in Figure 2, and later described in detail, to control a source of power, preferably an electric motor, to drive the head motion to reverse the weaving action and to back up the warp, preferably exactly the distance required to replace a, broken filling thread, all in relation to direction and speed of drive of the warp beam. In the specific embodiment of the invention disclosed herein I provide motor 10 and an electric control circuit which is placed in appropriate condition to drive the head motion and to be controlled by a push button I20, by the actuation of a switch I00, desirably operated by shift lever 42 as by the rear end of link or sliding rod H6 actuated by shift lever 42, so that when clutch 31 is disengaged, by operation of lever 42, from the main loom drive means, switch Hill is simultaneously actuated to. condition certain circuits. The electric motor 10 is provided to turn the head motion through an electro-magnetically controlled clutch, generally indicated in Figure 1 in its entirety by the reference character BI and having a movable clutch member 82 .slideably mounted on motor drive shaft 10, biased in any suitable way as by spring 83 and lever arm 84, toward and into engagement with the companion clutch member 85, which as illustrated consists of a clutch face on the rear side of a bevel gear. The movable clutch member 82 is held out of engagement with companion clutch member 85 during forward opera.-

hunch of the operin reverse when clutch 8| is closed and motor I is operating.

The head-motion motor I0 is conveniently an alternating current motor such as a three-phase motor, receiving current from a main three-phase line or circuit (Figure 2) comprising conductors II, I2, and I3 to which the motor may be connected by switch blades I4, I5, and of a composite switch which, in the illustrative circuit and arrangement, preferably has two other switch blades I1 and 18, all arranged so that when the circuit of switch blades I4, 15, and I9 is open,"

the circuit controlled by switch blade 11 is closed and the circuit controlled by switch blade I8 is open. This composite switch is preferably of the remote controlled type and hence and illustratively is provided with a winding I9 having a suitable armature or solenoid core so connected to 201 blades 98 and 99 of a movable switch structure.

the switch blade structure that the latter is operated to close the motor circuit upon energlza tion of the winding 19, a, reverse actuation of the switch occurring upon de-energization of the windingl9. For convenience this relay operated switch is generally indicated in its entirety by the reference character 80'.

Power to turn the head-motion is delivered as earlier above-described through the electromagnetically controlled clutch 8| whose parts are schematically shown in Figure 2 as having the movable clutch member 82 biased inany suitable way as by a spring 83 and lever 84 toward and into engagement with the companion clutch member 85 but which may be held out of engagement 1 with the companion clutch member 85 by a solenoid 86 whose winding receives energy from one phase, such as phase I I-|3 Of the power circuit, through the switch blade 11 of the main relay switch 80. The circuit for this purpose extends from conductor II, conductor 81, winding of solenoid 86, conductor 88, switch contact 89, switch blade TI (closed, when the main switch 80 is open, thus to hold the clutch 8| disconnected), and then by way of conductors 90 and 9| to the other conductor 13 of the phase II-I3; In the normal operation of the loom, clutch members" and 85 are out of engagement, main switch 80 is open, and hence motor I0 is at rest.

During such normal operation of the loom, the warp beam B is driven controllably, as is later described, by the motor 93 by suitable gearing as is indicated in Figure la, such gearing including a worm 10, reduction gearing 58'and bull gear 58* connected with the beam B. The beam drive, being through the worm w, may thus be selflocking or irreversible to prevent the beam B, by

its momentum, from overriding the drive of the motor 93. I Warp drive motor 93 drives the beam B in warp let-ofl direction at a speed which is controlled, preferably by the whip roll 59 (Figure 1a) so as to maintain substantial constancy of tension of the warp W as the operation of the loom proceeds but provision is also made for reversing the drive of motor 93, during this normal operation of the loom, todrive the beam'B in take-oil direction, and according to certain fealcures of my invention, I make use of this reversal of the drive of the warp beam 18 by the motor 93 to take up the warp W during the interval of time s that motor I0 drives the head-motion to reverse the weaving action.

position of switch I00.

The warp-drive motor, indicated in the diagram by the reference character 93,is preferably arranged for control of its speed and direction a of drive and conveniently is a direct current motor comprising an armature 94, and a field winding 95. Field winding is preferably arranged to beenergized at constant voltage from any suitable source of direct current, for example, a.

direct-current generator D which may be driven by a motor K energized from and connected to the three-phase power circuit II, 12, I3, by conductors ll", 12'- and 13"; motor Kalso drives a H direct-current generator G. Motor and generators may comprise a so-called motor amplidyne unit diagrammatically indicated at A.

93 with fixed excitation. Motorarmaturefl is connected to-direct-current generator 'G by lines 99 and 91 and bylinesIN, I05, through switch designated as a wholeby the reference character I00. Switch I00 comprises also switch blades IOI,

- I02; and I03 for purposes later described. :With

respect to switch blades 98 and 99, the switch structure I 00 is of the double throw type, having itstwo pairs of contacts orossconnected as indicated to function to reverse the direction of current *iiow fromthe generator G to the armature trolled switch I 06, the control-winding I01 of which is arranged. in any suitable way-to close the switch upon energization of the winding I01 and open it upon dc-energization oi." the winding. With the switch structure mo thrown to the left, motor 93 operates in foi'ward direction to let of! f the warp andswitch blades IN and I08 hold later-described circuits open since they are out of contact 'withthe switch contacts I08 and III while auxiliary switch blade I02 is brought into engagement with fixed contact I09, thus completing through the latter a circuit for energizing thefield winding F of the generator G and in which circuit provision is made to vary or control the amount of excitation supplied to the field winding in orderythus to vary or control the energy supplied to motor armature 94 and correspondingly to vary its speed of'drive. This I prefer to do by way of a rheostat I I0 controlled by the whip-roll as is later described and includ- ,-ed in the circuit of generator field F to thereby vary the speed ofthe motor 93 and the rate at warp take-up direction may be manually controlled or set, and arrange the two rheostats so that either is made effective according to the The resultant selective shifting of the two speed controls or rheostats I furthermore co-relate, as is later described, with the control and drive of head-motion motor I0.

With switch I00 thrown to the left, for forward orlet-ofl. drive, a rheostat-controlled circuit will be seen to extend from the generator D, conable way as indicated in Figure la. It is over 93 and hence of the warp beam; at the same time I I 95 field winding H, and by way of conductor 95 back to the excitor generator D.

Considering now the specific or preferred form of control of speed and direction of drive of the warp beam in response to changes in tension and reach of the warp W, I prefer to employ the system and arrangement disclosed in the abovementioned co-pending application to which referenoe may be made for its specific details of construction and operation but in Figure 2 I have schematically and diagrammatically shown how I bring that system and arrangement-of control into cor-acting relationship with the head-motion motor drive and other controls and in both Figures la and 2 I have indicated the mechanical arrangementwhereby direction and speed of control of the warp drive motor 93 may be controlled by the whip-roll. 7

Thus the whip-roll 59 is mounted for movement toward or away from the head-motion or lay of the loom, conveniently by rotatably supporting itin the upper ends of laterally spaced arms 60 (onlyone of which is shown) which are suitably pivoted at their lower ends in any suitjtheswhip-roll 59 that the warp threads W are led from the beam B, through the loom head to the loom take-up roll. whip-r6ll59 are bell cranks 65 (only one of which is shown) pivoted as at' 65 to swing in substantially a horizontal plane, the long arms of the cranks being parallel and joined for movement together by a tie rod 65 Suitable ,means are provided to cause the bell cranks 55 to swing or move about their pivots in response to changes in position of the whiproll 59 toward or away from the loom head, and for this purpose the bell cranks 65 may each have a transverse or short arm 65 constructed to have the two spaced arms 60 bear respectively against them under the tension of the warp threads W. The tension of the latter may be approximately determined by setting or determining the resistance which the bell crank 65 offer against movement by whip-roll supporting arms 60, such as by a chain 65 connected to the cranks 65 and running over a sprocket 65? and having a weight 65 on its end. Sprocket- 65 is fixed to a spindle or shaft 55 rotatably supported in suitable bearings in an arm (i and having at its end suitable lost motion connection, ind cated at 65 with the arm H0 of the rheostat H0. Thereby changes in tension of the warp W, effect change in rotary position of the sprocket 65 and its shaft 65 and also of the position of the rheostat arm H0. The weight 65 is variable or adjustable in any suitable way.

With switch I00 actuated to the left in Figure 2, for warp let-off drive of the beam B, the speed of the motor armature 94 0f warp drive motor 93 to drive the beam in let-01f direction, is determined, during normal operation of the loom, by the position or the whip-roll 59 within a cer- Adjacent each end of the projecting arm 55 operation of the loom, and in coaction with the just-described speed variation in the drive of the motor 93 in warp let-oil direction, provision is made, preferably in the manner described and claimed in the aforesaid co-pending application, to cause the whip-roll, when conditions arise to move it rearward (to the left in Figure 1a, to effect reversal of the motor 93 and thus cause the warp beam B to be driven in take-up direction and thus .cause restoration of the position of the whip-roll within that range of its movements toward or away from the lay of the loom again to function to control the speed of the warp-drive motor 93 in let-off direction.

Such an arrangement may comprise a laterally adjustably carried by crank 65, preferably in any suitable way, as by threading the member 65 in the crank 65, so that the extent to which the member 65 from the crank 65 may be adjusted.

Arm 65 is arranged in any suitable manner to actuate a snapswitch mechanism generally indicated by the reference character S and provided with a movable contactor Iii which is in engagement with either of two contacts 6| and BI for correspondingly energizing either winding Bi or winding 6 of electro-magnets or solenoids whose armatures or cores are suitably connected mechanically to the switch I00 to actuate the latter either toward the left (for forward driveside of the generator D circuit, as to the conductor '95", a conductor 6| connects two terminals of the windings (il and Iil to the other side of conductors 95 of the generator D circuit, conductor BI connects winding 6V to contact Gi and a conductor 50 connects the other terminal of winding 6l to contact 6!.

The switch structure S has an operating member 64 positioned in the path of horizontal oscillating movement of the member 65 member 64 is suitably mounted as at 64 for pivoting movement and is biased by a spring 64 toward and against a stop 64, and is connected, through any suitable spring-toggle mechanism diagrammatically represented or indicated at 64 to the contactor Iii so that contactor 6| is snapped over from one contact (6| or 6!) to the other only after the operating member 64,. under the joint action of actuating member 65 and the Spring 64", passes the mid-point of its arc of swing, usually corresponding to vertical or upright position of the part 64.-

With actuator 65 out of engagement with the operator 64, spring M holds the member 64 against the stop 64 and hence at the extreme left-hand position away from its mid-position or vertical position, and thus contactor fil is held in contact with contact 6| to maintain winding 6| energized and thus maintaiii forward direction of drive of the warp beam motor projects 9 back and forth movement of the whip-roll 59 relates the actuator 8-"! to the switch operator 64 so that it is out of engagement with the part 64 or, if in engagement withit, positions the member 84, against'thebias of sprlng 04", to

the left of the vertical mid-position of operator 64 However, should conditions arise where the whip-roll 59 moves rearwardly beyond th range just-mentioned, and this can happen when-the.

loom has been idle for substantial periods-of time, or also due to other conditions which can arise during the normal operation of the loom, the actuator 65* moves in clockwise direction (Figures 1a and 2) to move the pivoted operator 84 to the right beyond its mid-position, thus snapping the contactor BI away from contact BI" and into engagement with contact 0I, thus i ing 6| to actuate switch I00 to the right and thus reverse the drive of warp drive motor '93.

Beam B is thus driven in reverse direction, but

preferably at normal speed inasmuch as whiproli responsive rheostat I I0 is cut out of the speed control circuit at switch blade I02 and contact I09, and rheostat I I I is substituted for it by switch blade I02 engaging switch contact II4 to place it in a circuit earlier above-described. Rheostat I I I may be manually set to give the motor 93 the desired rate of drive of the warp beam in take-up direction. l

As the warp beam B thustakes up warp, the

dc-energizing winding 6I 1and energizing windreach of warp threads W, from the warp beam over the whip-roll to the loom head,-is thereby shortened up and the whip-roll 59 is thereby moved toward the right in Figure 1a until it has reached a position where, through crank 65, actuator 65 recedes or moves to the left sufficiently to bring the operator 64, biased by spring 64, into its left-hand range of swinging movement and thus snap over the contactor 6 I to deenergize switch winding 6i andenergize switch winding I5 I to thereby actuate switch I00 to restore the forward drive of warp motor 93and to substitute the whip-roll responsive rheostat I I 0 for the manual rheostat III. I

The lost motion connection 65 and the, snapover mechanism 64 of switch S insure smoothness of operation of the mechanism. The loss motion connection 65 takes part in avoiding hunting in that certain minor shifts in the back and forth movement of the whip-roll 59 are not communicated to the rheos tat and thus what would otherwise be very numerous back'and forth'readjustments, in minute increments, between whip-roll and motor speed can thus be avoided. The snapover switch mechanismand the relationship between the operator 64 and the actuator 65* function in a generally similar manner, it being noted" that the operator 64 may be contacted by the actuator 65 and by it give back and forth move- 10 utilize the reverse driveof the warp beam by -motor 03, under the control of switch I00. For

this purpose, and as earlier above noted, the cloth take-up roll is arranged to be driven in cloth letoff direction, under the control of shifting lever 42 which can be actuated to position clutch 3 (Figure 1) to disconnect or interrupt the takeupdrive from shaft I0 and toposition sliding collar 44 in its upper position so that gear C can be driven for cloth let oil from shaft-I0 which is now to be driven by head-motion motor I0, provided that clutch 8| is actuated to couple moto I0 to complete the drive of the shaft I0. i During normal operation of the loomgwarp drive motor 93 operates inforward or let-off direc- ,tionbf drive, under speedcontroi, through the rheostat -I I0, .by'the whip-roll, excepting for such. relatively infrequent and in any case short in,-

tervals of time during which the snap-over switch mechanism Sis actuated for take-up drive of the warp beam by the motor93; when conditions arise where reverse drive of the weaving action is needed, therefore, switch I00will usually be found in its position tothe left and hence for forward 'or let-oil. drive by motor 93 of the warp beam. I

therefore provide for the actuationof the switch I00 from its left-hand position in Figure 2 to its right-hand position, in response to actuation of the shifting lever 42,. and this may be done mechanically through a loss motion connection diagrammatically indicated in Figure 2 which permits actuation of switch I00 under the control of the windings 6 I and 6I so long as shifting lever 42 is not actuated for reversing the weaving action but which throws and holds the switch I 00 to the right in response to shifting of shifting lever into position to reverse the weaving action drive.

Thus, a mechanical. linkage I I6, actuated by or from the shifting lever 42, may have a lost motion connection II'I analogous to a pin and slot connection with the contactor bar I00 of the switch I 00 so thatwhen the shifting lever 42 is" in the position shown in Figure 2, switch bar I00 ments, throughouteach of the two ranges of pivoting movement of the member 64 to either side of its vertical mid-position, without moving the contactor GI, excepting at or'about the midposition. 0

Considering now the controls for efiecting drive of the head-motion to reverse the'weaving action and the inter-relationship thereof to the control 7 by the whip-roll of the speed and direction of drive of the warp beam, it is first to be noted that, for such drive of the head-motion, the reversely moving warp W should betaken up; here Ipreferably utilize the warp beam B and arrange it to be driven in take-up direction. Hence I preferably may be actuated by the windings Bi and 9 I into either of its positions to the left or right but upon actuation of the shifting lever 42 in counterclockwise direction, the lost motion connection picks up the contactor bar I00 of the switch and moves it from its left-hand or forward switch position "to its right-hand or reverse switch position; Such actuation of the switch I00 thus changes the motor connections so that the direction of drive of motor 93 is reversed. and also, at contact I09, the motor ,is'freed from speed control by the whip-roll rheostat I I0 for which manual rheostat position in which a contactor I00 controlled or actuated by the lever I59 is in closed position in a circuit to maintain energized the winding I 01 of switch I06 and thus to keep the switch I00 closed. This energizing circuit and related circuits are described in detail later on.

Such actuation of the switch I00, however, also closes a circuit at contact I08 by. switch blade IM and in that circuit'is included the abovementioned push button switch I20, and alsothe Winding I2I of a relay switch generally indicated,

winding m extends from transformer winding operation of head-motion, and

verse drive of the weaving by the reference character- I22 and which is constructed. in any suitable way to have two movable contactors I23 and I24 arranged in any suitable wayto be moved upwardly as seen in the diagram upon energization of the winding I2Iv and to be moved downwardly, as'by a spring I25, upon de-energization of the winding. Energy for energizing the winding I2I may be derived from a suitable step-down transformer I26-I21 whose high voltage winding may be connected as by conductors I28 and I29 to one of the phases 12-13 of the main'power line and whose low voltage winding of 12 volts, is thus available for energizing the of the relay switch I22. Closure of push button switch I20 energizes the relay-switch winding I2I through a circuit which I26, conductor I28, switch contact I08, switch blade IOI (in closed position), conductor I29, switch I20, conductor I30, winding I2I, and then by conductor I3I back to the other side of transformer winding I28. The energization of relay switch winding I2 I, with resultant actuation of itself, sets into motion a number of instrumentalities, including the' actuation of the switch 80 to start the actuation of clutch 8| into driving relationship, all as is about to be described, but it is at this point noted that these instrumentalities cannot be set into action, as by accidental actuation of the push button switch I20, during normal the loom, for during 'the latter switch I00, as above noted, is in its left-hand position for forward or let-off drive of the warp drive motor 93, position of switch I the just-described circuit in which is included push button switch I20 is open at switch contact I08 and switch blade IOI (in open positio'n).. Accordingly it will be seen that shift lever 42 must first be actuated to disconnect the main loom drive from shaft I0 of the that actuation of shift lever 42 moves switch I00 to the right, thus closing the above-described push button circuit at contact I08 and switch blade IOI; thus start of the headmotion motor drive, by'the push button control I20, is permitted only after the just-mentioned parts of the loom have been conditioned for reaction.

Energization of winding I2I actuates relay switch I22, the contactor I23 of which is moved into engagement with a contact I32 and thus close a circuit to the winding 19 of the switch 80 which controls the operation of head-motion motor and certain other devices. The energizing of circuit for winding 19 includes a low voltage winding I33 (illustratively 110 volts) of a stepdown transformer whose high voltage winding I34 is connected by conductors I28I29 to one phase of the main I33, the energizing circuit for winding 19 proceeds by way of conductor I35, conductor I36, conductor I31, winding I32 of relay switch I22, contactor I23, and by way of conductor. I40 back to the other side of winding I33.

Switch 80 is thus moved to close'the circuit to the motor 10 by switch blades 14, 15, and 16, thus starting the motor 10, and at the same time the circuit of winding of clutch solenoid 80 is broken by switch blade 11 so that movable clutch member 82 is moved by the spring 83 into engagement with the companion clutch member 85, so that motor 10 can drive the head-motion to reverse I26, giving a voltage on the order the drive of head-motion motor 10 and at controlled speed, and in such ing of clutch solenoid 86 to hold clutch 8I in dis- Thus, it may include the weaving action but this 'drive is preferably to be only of selectable or predetermined extent, suchas for example only one turn of the headmotion, and accordingly a suitable timing mechanism is brought into action to interrupt the justdescribed drive by the motor 10 at the desired point. Such timing mechanism may be of any suitable or desired form and preferably is arranged tocause actuation of the switch 80 in opening'direction, thus to halt the drive of headmotion motor 10 and also to again energize windengaged position. Conveniently, therefore, the timing mechanism is. arranged to de-energize winding 19 of the switch 80, after the lapse of the desired time interval.

Illustratively and preferably, such mechanism may comprise a vacuum tube type of time delay relay diagrammatically indicated at HI and it may be of any desired or suitable construction. a contactor I42 normally in closed position and adapted to be actuated into open position only after the lapse of the desired The contactor I42, when thus time interval. actuated into open-circuit position, is to de-energize the winding I2I of'the relay I22 and since the actuation of the push button switch I20 may 45 of conductor I281 back power circuit; from winding 18, conductor I38, contact be only momentary, provision is made for the actuation of a suitable holding switch to keep closed the circuit initially or momentarily closed by the push button itself. Such a holding is preferably provided in-the construction of relay switch I22, as by an additional contact the of the double-throw switch I00, contact II2, con-.

ductor I55, contact I54, contactor I24, and byway to the other side of the transformer winding I26. Inclusion of contact I I2 and switch blade holding circuit also insures against possible clo-'- sure of that circuit ing in its position to the left and thus interrupting this holding circuit at contact I I2; this same arrangement, furthermore, is made to function, as

is later described, also to insure against energization of this holding circuit when certain other parts are operated.

With the energization of relay winding I2I thus maintained, the circuit of main switch winding 19 is also held closed, atcontactor I23 and contact I32 of the relay switch I22. The tuation of the switch 80 by winding 19 also closes a circuit at contact I45 to energize the vacuum tube circuit within the relay I to effect actuation in opening direction of the contactor I42 after the lapse of the desired time interval. Energization of the vacuum tube time delay relay MI is achieved from the volt transformer winding I33 which is connected by conductors I35 and I46 to binding posts I41 and I48 to supply the vacuum tube circuit with suitable high voltage, the initiation or starting of the vacuum tube circuit to effect he running of the desired time switch with which the contactor I24 engages upon initial energization of its winding I03 Of the switch [00 in this during normal operation of the loom in forward direction, with tho warp initial acinterval being effected blade 18 and contact I45 01 a line which extends controlled by the main positions.

13 I p by the closure at switch from one side of the transformer winding I33, then conductor I35, conductor I35; switch contact I45, switch blade 18, conductor I50, to binding post I 5I of-the time delay device I 4|. The internal vacuum tube arrangements and circuits are not shown in the diagram, excepting the diagrammatic indication at I52 of a suitable winding or windings to actuate the switch contactor 2, since the vacuum tube circuit arrangement is per se not my invention and may take any suitable or known form, it being suflicient to point out simply that winding I52 is energized to move th'e contactor 142 into open-circuit position after the lapse of the desired time interval, the vacuum tube circuits including, in known manner, such the starting lever I59 in tripped or stopping position. Accordingly, when the loom is thus automatically stopped, the tripping of the starting lever I59 into stopping position interrupts the circuit of switch winding I01 at the contactor I60, switch I06 thereupon opening to stop the warp drive motor 93. contactor I60 remains in open position but, upon shifting of the shift lever 42 and actuation of the push button I20, to effect reelements or factors, preferably adjustable so as to vary the time delay period, as resistances, in-

ductances, and condensers such that, for example, the leakage of current through a condenser takes place at such a low rate as to effect,

by suitable means or arrangements, energization of the winding I52 to open the contactor I42 only after the desired time integral has elapsed.

switch I22 is deenergized, opening the circuit of main switch winding 19 at the contactor I23 and fixed contact I32, thus restoring the various parts switch 80 to their initial When relay switch I22 is actuated, upon en- 1 25 When that happens, winding I2I of relay verse drive of the pattern chain and of the warp beam, switch winding I01 isagain energized by the relay switch I22 closing an energizing circuit for winding I01 so as to move the switch I06 into 0 closed position. Reverse drive of the warp motor 93 thus starts substantially simultaneously with the reverse drive of thetpattern chain and cloth 'roll by motor 10, and the circuit arrangements are such that both'of these drives are halted substantially simultaneously. 1

- The circuit closed by relay switch I22 at conq tact I54fextends from low voltage winding I26 of the transformer I26--I21, conductor I28 contactor I24, contact I54, conductor I55, switch contact II2, conductor, I56, switch winding I01, and then by way of conductor I51 back to the transformer winding I26.

This circuit, however, is interrupted, and the reverse driveis stopped, when winding I2I of relay switch I22 is de-energized by. the time-delay ergization of its winding I2I, as above-described,

the movement of contactor I24 of relay switch, I22, disengages it from a fixed contact I53 and brings it into contact with the above-noted fixed contact I54, thus also closing a circuit to winding I01 of the switch I06 in the circuit of the warp drive motor 93. member I06 into closed position starts, the warpdrive motor 93 which operates in reverse'direction in as much as switch I00 is thrown to theright. The speed of drive in reverse direction may be manually set by hand rheostat I I I. Since warp drive motor switch IOBI01 and switch 00 of the head-motion motor 10 are both actuated in response to actuation of the relay switch I22 which in turn is actuated into starting position by thepush button switch I20, the, pattern chain and th'e cloth take-up roll andthe warp beam B are thus driven in reverse direction. This reverse drive is initiated by the operator, in the manner above-described, when for example it is necessary to replace a brokenfilling thread; the warp beam motor 93 thus takes up the warp I threads and-'maintainstension on them that is appropriate for and during the reverse travel of V the warp threads through the loom head, and in step with the let-off of the cloth from the cloth take-up roll, the speed of drive of the warp'drive motor 93 forthis purpose being manuallycontrollable or capable. of being set by the rheostat III which is brought into the speed control circuit by the movement of switch I00 intoits righthand position in which it is held locked by the relay I, for winding I01 is tie-energized by the now-open switch I 24 I54 and switch I06 opens to stop the warp drive motor; at the same time, winding 19, of the main switch 80 is open-circuited, at I23-'I32 and switch 80 restored to open The resultant actuation of switch filling thread.

position. Thus the reverse drive by both motors 93, and 10 is halted substantially simultaneously. The time interval determined) illustnatively by the electronic time relay I'll, may be, illustratively, of such duration that the reverse drive is suiiicient to eifect replacement of one pick or If additional reverse drive is necessary, as for the replacement of a second broken filling thread, theoperator simply pushes the push button I20 again, shift lever 42 :being still in shifted counterclockwise position and switch I 00 being still in its right-hand position for reverse drive of the warp beam motor 93,

whence relay'switch I22 is again actuated, thus v of reverse drive may be adjusted or predetershift lever 42' when the latter was initially actuated to condition various of the loom parts for reverse drive. I i

Usually, the breakage of a thread, as is well 1 known, automatically stops the entire drive of the loom whose controls are well known and'therefore not shown but include a loom starting lever I59 which is tripped into stopping positionywhen a condition like a broken thread automatically stops the loom drive. In Figure 2 Iihave shown mined by appropriately setting or adjusting the time delay relay Ill.

Both motors, however, may be stopped in theirreverse driveat any time, while under the control ,of the time-relay I, by opening the multiple switch I00 which interrupts the circuit of the warp drive motor 93 and which, at switch blade I03, interruptsthe circuit through which the relay switch winding I2I is held energized by the time-delay relay HI.

Opening of main switch also, at contact I45 and blade 18, opens the auxiliary circuit I=50-'I36 of the time delay relay I4I, restoring the latter to normal condition and allowing its contactor I42 to restore to normal closed position.

After the time delay relay I4 I has operated to 'cally actuated -IIII as above-described; switch I also puts a not be energized by push button switch tends from the transformer switch I50 isjclosed de-energize relay switch winding I2! and thus halt both motors, and the operator has replaced the pick, the loom is now ready to commence normal operation and hence the operator first actuates the shift lever 42, diagrammatically in clockin Figure 2, thus to restore the normal forward drive of the head-motion and related parts from the shaft I0, through the clutch 31 and thus also actuating the multiple switch I00 to move it from the right to the left, thus conditioning of the warp drive 90-49, for operation in wise direction motor 93, at switch blades forward direction, and

aim, at switch blade I02 and contact I09, connecting the generator field winding 1-! into an energizing circuit which includes the automatior whip-roll controlled rheostat and contact I08, in the I2I so that it can- I20, and the interruption at switch blade I03 and; contact II2 prevents energization of relay winding I2I when starting the loom under manual control of starting lever 'I59. The operator next actuates break, at switch blade IOI circuit of relay switch winding the 100m starting lever I59,- placing its contactor I50 in closed position.

Contactor or switch I60 thus effects closure of I the switch I03 of the warp drive motor 93 so that it drives in forward direction at a speed determined by the automatically actuated rheostat by the contactor I60 ex-.

H0. The circuit closed winding I26, conductor I28, relay switch contactor I24, contact I53, conductor IBI, contactor I60 (closed), conductor I62, switch winding I01, and then by way of conductor I51 back to the other side of transformer winding I26, Movement of loom starting lever. I 59 into stopping position opens the-Justdescribed circuit and halts the warp drive motor 93.

' Since the contactor I42 and 93 and when startstart the loom for norto close switch I80,

the circuit of the armature 94 made to guard against energizatlon I22 when length of switch actuator 65 on the crank.

Breakage of a filling thread automatically stops the loom and trips the starting lever I59 into stopping position, opening the circuit of switch winding I01 at contactor IIi0'and thus also halt ing the drive of the warp beam motor 93. To effect drive, the operator shifts the shift lever 42 to disengage or unclutch the normal forward drive of the loom as at clutch 31, the same operation of shifting lever 42'actuating switch I00 to the right to condition the various control circuits for push button and other automatic control and also to condition the circuit of the warp motor 93 for reverse drive; the operator then pushes button switch I20, whereupon motor 10 and clutch 8 action and warp motor 93 drives the beam B in take-up direction, all for and during a control-.- lable time interval or extent of reverse drive, determined illustratively by thetimejrelay I.

The operator replaces the pick, and if no more he shifts shifting]- lever 42 to condition the head-motion drive, at a clutch 31, for forward drive from of the loom, the actuation of the shift lever 42 shifting the switch thus conditioning the circuit of the warp drive replacements are necessary,

the main drive I00 to its left-hand position,

motor 93 for normal forward drive under variable conditioning the against accidental or and conditioning the the starting lever I59. Upon I59 and pattern chain pin 20 into starting position, the weaving action unintentional actuation,

and related drives start up inforward direction and warp motor switch I06 closes at the same of time relay I is i closed position upon completion of the joint re- I I00 which, upon setting of the shift lever '42, is

put in its left-hand tion of relay winding because thepossible circuit to do so, namely, transformer winding I26, winding I2I, conductors I30-I43, contactor I42 (closed),.conductor I44, switchblade I03, contact II2, conductors position, and hence en'ergiza- 'I56--I62, switch I60. (closed), conductor IBI,

I24 (closed), conductor I23, is open at switch contact I53, contactor I28, transformer winding blade I03 (to the left) Normal operation of the loom is thus restored, the tension on the warp threads W being auto-' matically maintained substantially constant by the speed control of the warp drive motor 93 in response to shifts in the position of the whiproll 59 caused by changes in tension, the whiproll 59 also effecting resetting of its position by effecting actuation of the switch mechanism S, to reverse the warp beam drive, when conditions arise in the loom such as bring the whip-roll 59 rearwardly or to the left. in beyond a selectable position which may be ad- Justed or selected by appropriately adjusting the- I2l does not take place Figure 1a to or I time to start drive of the. warp beam under the forth together with many thoroughly practical advantages are successfully achieved. ious possible embodimentsmight mechanical features of the above invention as the art herein described might be varied in AS varvarious parts, all without departing from the it is tobe understood that scope of the invention, all matter hereinbefore'set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

What I claim is: x 1. In combination with the head motion of a m a main source of power for forward drive of the loom, a first clutch means for connecting and disconnecting said head motion and said source of power for forward drive, member adapted in one position to engage said first clutch means and in another position to disengage said first clutch means, 'a second 4 source of power, a second clutch means for connecting anddisconnectin'g said head motion and said second source of power, an electrical circuit including said second source of power, and control means for said second clutch means, a control switch, and a second switch connected to said movable member and adapted to be closed by the movement of said movable member to disengage said first clutch means, the closing of said second switch serving -to condition said circuit so that said control means for said second clutch means is actuated to engage said second clutch upon the closing ofsaid control switch, and timing means adapted to actuate said second a I effect drive to reverse the weavin speed'control by the whip-rolL at the same time head-motion motor controls warp drive motor switch be made of the I and and a movable 17 1 18 clutch control means after apredetermined intersaid head motion for reverse of the weaving acval to disconnect the said head motion from its tion and for let off of the cloth roll, said means said second source of power. comprising an electric circuit adapted when closed 2. In a loom in combination with the cylinder to actuate said warp beam drive means for res ears for the harness frame and shuttle boxes, 5 verse drive, and timing means adapted to open a drive member connected to the said gears, a said circuit after a predetermined interval, main source of power, and means to connect and 6. In a loom in combination with means for redisconnect said main source of power and said versing the pattern control means and the cloth member, a second source of power, and means roll drive, and the warp beam, means for driving operable simultaneously with the disconnecting said warp beam forwardly and in reverse, control from said member of said first source of power to means for the forward drive of said warp beam, condition means for connecting said second control means for the reverse drive of said warp source of power to said member, means for combeam, and means operable simultaneously with pleting the connection between said second source a said pattern and cloth roll reversing means to cut of power and said member and means serving to out said control means for the forward drive of limit the duration of the said connection between said warp beam, and to actuate said control said member and said second source of power. means for the reverse drive of the warp beam,

' 3. In combination with the head motion or a and timing means adapted to disconnect said. re loom, and drive means, therefor, a main source versing means and to condition said warp beam 1 of loom power, clutch means for interconnecting drive for forward drive after the warp in said said head motion drive means and said main loom has moved backward a desired distance. source of power. for forward drive of the loom, 7, In a loom in combination with the cloth roll, a second source of power, and a second clutch the warp beam, and the head motion,-means in means for interconnecting said head motion with dependent of the main loom drive for driving said said second source of power for reverse drive 01' 5 head motion, means operative when said indethe loom, control means for. engaging and dis: pendent means is operative to reverse the rotaengaging said second clutch means, and means I tion of the cloth roll to cause it to let off the operative when said first clutch means is disencloth, means independent of the mainloom drive gaged to condition the said control means to enfor driving said warp beam, control means,

, gage said second clutch means upon the actuation means operable upon actuation of said control of a manual control, manual control means for means for-interconnecting said head motion and completing the actuation of said control means, its said independent drivin'g means, and for conand timing means adapted to actuate said second ditioning said warp beam for reverse drive, and clutch control means to disengage said second other means actuated by said control means for clutch means after a predetermined interval of cutting out said warpbeam conditioning means time, a warp beam, reversible eans for drivi g and for disconnecting the headmotion and its e warp bea d eans operat ve su stant al y said independent drive means after a timed insimultaneously with the engaging of said second t rva i clutch means to reverse the warp beam drive. 8. In a loom in combination with a head m0- In combination w a 1 m av a head 40 tion, means ior'disengaging said head motion motion including pattern control means and cloth from a mai source of power, a, warp beam and p roll driven during forward drive of the reversible means for driving said warp beam, a 100111 y a main source of power, and means o 'second source of power for driving said head mo... disconnecting said head motion and said take-up. t n, means operative upon' disengagement of said roll from said main source of power, a second head motion from said main source of power to Source Of P w clutch means for interconnecting condition. means to engage said head motion'with said second power source and said head motion s se ond source of powerupon the operation for driving said head motion during reverse drive of ma a control means, and manual control 01 he 100m. mea pe a ve upon disconnectin means therefor, said means being so related to said head motion from said main source of power id warp beam drive means that the latter is to connect said head motion to the cloth take-up reversed upon actuation of said means.

roll for'let-ofi of said roll during drive of the 9. Inaloom, in combination with the head mohead motion y Said second sour e of power, tion including the pattern control means, means means o r s t pattern control means d for reversing the pattern control means, the cloth ing reverse drive of the loom, an electric circuit roll and the warp beam, means for driving said including a first switch, a second switch so related head motion durin forward drive of the ,loom, to said means for disconnecting the head motion driving means for said warp beam having reversfrom the main source of power that it is closed ing means for reversing the direction of drive of when said disconnecting means is actuated, the warp beam and having means for varying the means actuated upon the closing of said first speed of drive of the warp beam, means responswitch o engage s clutch means P o d d sive to changes in tension of the warp for consecond switch is also closed, and timing means trolling said speed varying means to vary the dap d to open said first switch after a iven speed of drive of said warp beam .in warp let-off interval and thus to disengage said clutch and direction, other means for driving the head moterminate the reverse drive or the loom. i 5 tion to back' up the cloth roll and the pattern 5. In a loom in combination with the head m0- control means, means to efiect actuation of said tion the cloth roll and the warp beam, and means 7 war drive reversing means to drive the warp f d vi e warp e m forwar ly or in r vers beam in tape-up direction, and means operable a main loom source of power for forward drive to make saidspeed varying means inefi'ectual to including drive of the head motion, means for respond to changes intension of the wa p threads disconnecting the head motion drive from the during backward drive of said cloth roll and patmain loom source of power and simultaneously tern chain and said warpbeam.

connecting it to the cloth take-up roll for actua 10; In a loom, in combination with the head tion of the cloth roll in let-off direction, means motion and the warp beam, means for driving independent of the main loom drive for driving said head motion for forward weaving action,

, sion of the warp the speed of drive of said warp means for driving said head motion to reverse the weaving action, means for automatically timing the reverse drive and automatically stopping the reverse drive at a predetermined point in the weaving cycle, means for driving said warp beam direction, and means making said the extent of the in take-up. warp beam drive effective for reverse weaving action. Y 11. In a loom, in combination with the pattern chain, the cloth -roll and the warp beam,. means for driving said pattern chain and cloth roll and operable to drive them in either forward or reverse direction, means for driving said warp beam and operable to drive it in either let-off or'takeup direction, means responsive to-changes in tenthreads during forward drive of the pattern chain and cloth roll for changing beam by said drive means in let-off direction, and means mak-' ing said tension-responsive means ineffective during concurrent drive by their respective drive means of said pattern chain and cloth roll in reverse direction and said warp beam in take-up direction.

12. In a loom, in combination with the pattern chain, the cloth roll and the warp beam, means for driving said pattern chain and cloth roll and operable to drive them in either forward or remeans for drivin said warp beam and operable to drive it in either let-off or takeup direction, means operating during forward drive of said pattern chain and cloth roll, and during drive of the to effect drive of verse direction,

the warp beam by its drive means in take-up direction in response to increase in the reach of the warp threads from the warp beam to the cloth roll and operable to halt saidtake-up drive in response to restoration of the desired reach, and means making said reachresponsive means ineffective during concurrent drive by their respective drive means of said pattern chain and cloth roll in reverse direction and of said warp beam in take-up direction.

13. In a loom, in combination with the pattern chain, the cloth roll and the warp beam, a source of power for driving said pattern chain and cloth roll in forward direction, a source of power for driving said pattern chain and cloth roll in reverse direction, means for driving said warp beam in warp take-up direction, interdependent control means for said sources of power whereby only one of them is effective at a time to drive said pattern chain and cloth roll, and means making said-warp beam driving means effective for takeup concurrently with, and continuously for the extent of, the drive of said pattern chain and cloth roll in reverse direction by said second source of power.

14. In a loom in combination with a pattern chain, the cloth roll and the warp beam, means motion, drive means warp beam in let-off direction,

for driving said pattern chain and cloth roll and operable to drive them in either forward or reverse direction, means for drivingsaid warp beam and operable to drive it in either let-off or take-up direction, means operating during re-, verse drive of said pattern. and during drive of the warp beam direction to effect a change in the direction of drive of the warp beam by its drive means and cause it to the be driven in let-off direction in response to decrease in the reach of the warp threads from the warp beam to the cloth roll and operable to halt said let-off drive in response to increase in the reach of the warp threads beyond a given extent.

chain'and cloth roll in take-up verse direction,

15. In a loom in combination with a, pattern chain, the cloth roll, and the warp beam, means for driving said pattern chain and cloth roll and operable to drive them in either forward or reverse direction, means for driving said warp beam in either let-off or take-up direction including means responsive to changes in tension of the warp threads during forward drive of the pattern chain and cloth roll for changing the speed of drive of said warp beam in let-off direction, and means operable during reversedrive of said pattern chain and cloth roll to reverse the drive of said warp for the extent necessary to restore the tension within said permissible range of variation.

16. In a loom, in combination with the head for the head motion and including selectively operable control means for effecting forward'or reverse drive of the head motion, a warp beam, drive means for said warp beam adapted to drive it either in take-up or letoff direction, control means for the warp beam drive means having means interlocking it with said selectively operable control means so that the warp beam drive is in take-up direction during reverse drive of the head motion and is in let-off direction during drive of the head motion in forward direction, means responsive to changes in tension of the warp during drive of the warp beam in let-off direction to control the speed of drive of the warp beam; and means for controlling the speed of drive of the warp beam in take-up direction during reverse drive of said head motion.

17. In a loom, the combination with the head motion and a main lqom power drive therefor including clutch means for connecting or disconnecting the head motion and the drive, an electric motor for driving the head motion in reverse direction, a'warp beam, means for driving said warp beam comprising an electric motor, a re-- off or warp take-up direction, an electric circuit including a switch for controlling said first motor and including timing means for actuating said switch to halt its drive of the head motion in remeans responsive to changes in the length of the reach of warp from the warp beam to the head motion for actuating said reversing switch to maintain the length of the reach within limits during forward drive of the head motion, means for actuating said clutch in a direction to disconnect the head motion drive from said loom drive and for shifting said reversing switch to a position to effect reversing drive of said second motor, and means responsive to actuation of said last-mentioned means to make ineffective said reach-responsive means and to condition the circuit and controls of said first motor for drive of the head motion in reverse under control of said timing means.

18. In a loom, the combination with the head motion of, drive means for the head motion including selectively operable control means for effecting forward or reverse drive of the head motion, said control means including electro-responsive actuating means, a warp beam, drive means for said warp beam adapted to drive it in either take-up or let-off direction and including control means therefor for determining the direction of drive and for halting the drive of the warp beam, an electric relay circuit havin therein an electro-responsive relay switch with a starting switch therein and a stopping switch therein, means responsive to actuation of said relay switch to make said electro-responsive actuating means effective to actuate said selectively operable control means forlreverse drive of the head motion, timing means made effective in response to reverse drive of the head motion and adapted to actuate said stopping switch after the lapse of a time interval, means responsive to actuation of said stopping switch for operating upon said warp beam drive control means to halt the drive of the warp beam, and means dependent upon said warp beam drive means control for preventing actuation of said relay switch under the control of said starting switch except when said warp beam drive 'control means is set for reverse drive of the warp beam.

19., In a loom, the combination with the head motion of, drive means for the head motion including selectively operable control means for effecting forward or reverse drive of the head motion, said control means including electro-responsive actuating means, a warp beam, a reversible electric motor for driving said warp beam, a reversing switch for said motor, an electro-responsive switch for starting and stopping said motor, a relay switch and an energizing circuit therefor including a start switch and a stop switch, means responsive to actuation of said relay switch for making said electro-responsive actuating means effective upon said selectively operable control means to eifect reverse drive of the head motion and to actuate said electro-responsive start and stop motorswitch into starting position, and

means responsive to the position ofsaid reversing switch for preventing actuation of said relay switch under the control of said starting switch except when said reversing switch is in position for reverse drive of the warp beam by its motor.

20. In a loom, the combination with motion of, drive means for the head motion inclucling selectively operable control means for effecting forward or reverse drive of the head motion, said control means including electro-responsive actuating means, a, warp beam, a reversible electric motor for driving said warp beam, a reversing switch for said motor, an elecltro-respom siveswitch for starting and stopping said motor, a relay switch and an energizing circuit therefor including a start switchand a stop switch, means responsive to actuation of said relay switch for the head making said electro-responsive actuating means effective upon said selectively operable control means to eiTect reverse drive of the head motion and to actuate said electro-responsive start and stop motor switch into starting position, means including a switch in the circuit of said electroresponsive motor start and stop switch for halting the drive of the head motion in forward direction and through said motor switch halt the forward drive ofthe warp beam byif means controlled by said relay switch for our ing actuation of said electro-responsive motor switch into motor starting position, and means interlocking said reversing switch and said clectric'al relay circuit whereby actuation of said relay switch under the control of said starting switch to effect reverse drive of the headmotion and to effect actuation of said electro-responsive motor switch into starting position is accomplished by reverse drive of the warp beam motor.

21. The method of operating a loom to replace a broken pick which comprises driving the pattern chain and the cloth roll in reverse, positively driving the warp roll in reverse continuously for the duration of the reverse weaving action, and interrelating both drives to control their duration and render them coextensive, timing the reverse drive of said pattern chain and cloth roll and stopping said reverse drive automatically at a predetermined point in the cycle of the pick.

FARRELL V. CLARKE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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