US2357448A - Pattern mechanism for looms - Google Patents

Description

5 1 1944- c. P. BERGSTROM 2,357,448

PATTERN MECHANISM FOR LOOMS Filed July 27, 1942 ZSheets-Sheet 1 FIE.1

INVENTOR.

' CARL P. Bane smut-4 Sept 5, 1944.

r c. P. BERGSTROM PATTERN MECHANISM FOR LOOMS Filed July 27; 1942 2 Sheefs-Sheet 2 FIE-1E INVENT'O R CH FLL "P. 'BzFaesTR M HTTORN-EY Patented Sept. 5, 1944 2,357,448 PATTERN MECHANISM FOR LOOMS Carl P. Berg'strom,

Millbury, Mass, assignor to Crompton & Knowles Loom Works, Worcester, Mass., a corporation of Massachusetts Application July 27, 1942, Serial No. 452,435

14 Claims.

This invention relates to improvements in pattern mechanisms for looms and it is the general object of the invention to provide means for repeating a warp shed for the introduction of two successive picks of a decorative weft.

In the weaving of certain fabrics such as neckerchiefs, scarves etc. it is desirable to introduce a heavy corded decorative stripe at the border of the fabric. When such a fabric is woven on an automatic loom the shuttle laying the decorative stripe will have two successive flights and in order that both picks may be laid in the same shed it is necessary to interrupt the sequence of shed movements so that the second shed corresponding to the second pick shall be a repetition of the first shed. 'It is an important object of my present invention to provide the loom with a harness pattern chain the bars of which are moved every pick of the loom but are so formed that they can control shedding operations from two rows of indicating members. The rows are identical but during the weaving of the body of the fabric one row only of each bar will control the loom harnesses. When the decorative shuttle comes into action both rows of indicating elements of the chain bar then in indicating position are used, thus repeating the shed.

Loom dobbies operate with oppositely reciprocating lifter knives the bottom of which has a working stroke on one pick and the top knife of which has a working stroke on the next pick. In the usual double index dobby the pattern chain moves every other pick and each chain bar has its two rows of indicating elements pegged differently so that successive sheds are different from each other. It is another object of my present invention to use the type of pattern chain used on a double index dobby but move the chain every pick of the loom so that the first row of indicators of one bar will control the hooks for the bottom knife on one pick and the second row of indicators of the next bar will control the hooks for the top knife on the next pick. Means are provided for periodically arresting advance movement of the pattern chain for one pick so that the top and bottom sets of hooks will be given the same indication for two successive picks of the loom from the same chain bar, thereby permitting the decorative shuttle to make two flights through the same shed.

The pattern cylinder'of dobbychains is ordinarily driven by a mechanism including an intermittently moving Worm wheel connected to the cylinder shaft by a clutch. It is another object of my present invention to construct the clutch so that preferably the driven part is shiftable with respect to the driving part on the drive wheel and cause a one-pick loss in the movement of the cylinder'due to the shift. This result may be accomplished by providing the driving clutch member with a number of lugs which is one-half the number of successive step by step movements of the cylinder needed to complete a rotation thereof, and provide the driven clutch member with a single lug which moves to a midposition withrespect to two driving lugs, thereby requiring a one-pick lapse before the clutch members are in driving relation. 7

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

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

Fig. l is a side elevation of a pattern mechanism made according to my present invention, Fig. 2 is an enlarged side elevation of the clutch and cylinder driveshown in Fig. 1,

Fig. 3 is a horizontal section on line 3-3 of Fig.2,

Fig. 4 is a vertical section on line 44 of Fig. 2,

Fig. 5 is a vertical section on line 5-5 of Fig. 3,

Fig. 6 is a vertical section on line 66 of Fig. 2,

Fig. 7 is a view similar to Fig. 1 but showing the clutch shifted from its position in Fig. 1,

Fig. 8 is a front elevation of one end of a dobby loom having my invention applied thereto,

Figs. 9 and 9A show diagrammatically two parts of the shuttle box controlling pattern chain and the relative positions of the clutch members for the different parts of the chain,

Fig. 10 shows a draft of the dobby harness pattern chain for producing a twill weave,

Fig. 11 is a view similar to Fig. 10 but suggesting a chain to produce a plain weave, and

Fig. 12 indicates a series of consecutive neckerchiefs or the like to be woven by my invention.

Referring particularly to Fig. 8, I have shown a loom frame l0 having a lay -'ll mounted on lay swords, one of which is indicated at I2. The

left end of the lay is provided with an upper shuttle box B for the plain or body weaving shuttle SB and a lower shuttle box B2 for the border or decorative weft shuttle SD. These shuttle boxes are shifted vertically by a lifter rod l3 connected to a lifter link M. A box operating mechanism designated generally at I5 is connected to a link I4 and may be of the conventional type. The mechanism I5 is under control of a box pattern chain l6 and is capable of moving the lifter rod l3 to cause either of the boxes B or B2 to be in active position, box B being indicated active in Fig. 8. Shuttle box B is active throughout the weaving of the fabric except on those picks when the border or decorative stripes are being woven, at which time the mechanism l5 raises the shuttle boxes to place box B2 in active position.

The shuttle in active position will beactuated by the picker stick I8 operated through mechanism designated conventionally at E9 every second pick of the loom, and it is to be understood that the shuttle in active position at the left hand side of the loom will be picked to the opposite or right hand side on one pick and will be returned to the left side on the next pick, thereby permitting the use of weft replenishing mechanism at the right hand side of the loom.

The loom is provided with a dobby D having top and bottom knives 20 and 2|, respectively, which operate on a two-pick cycle, the bottom knife having a working stroke to the left, Fig. 8, on one pick of the loom while the top knife has a return stroke, and a top knife having a working stroke to the left on the next pick of the loom while the bottom knife has its return stroke.

' Top and bottom sets of lifter hooks 22 and 23 are provided for actuation or non-actuation by their corresponding lifter knives. Jack levers 25 pivoted each to a harness jack 26 and each jack is attached by connections 21 to a harness frame 28. Each jack lever has a top and a bottom hook pivoted thereto and can therefore be actuated by either lifter knife.

The dobby includes two sets of hook position-'- ing fingers, fingers 30 acting through lifter wires 3| to position the top hooks 22 either in or out of the path of the top knife, and similarly fingers 33, by acting directly on the lower hooks 23, position the latter relatively to the bottom knife. The fingers are positioned by the harness pattern chain to be described in detail hereinafter. Depending upon the positions of the fingers 30 and 33 as determined by chain 35 the corresponding hooks will either raise or lower their harness frames to form the sequence of warp sheds desired for the particular pattern being woven.

The dobby frame supports a cylinder which in the present instance is given six step by step angular movements to complete a rotation thereof. This cylinder is secured to a shaft 4| journaled at 42 in the dobby frame and is driven by mechanism to be described so that the chain 35 is advanced one step or bar at a time to exert successive controls over the fingers and the harnesses.

A stand 45 is secured on the dobby frame and supports a shaft 46 carrying a cylinder 41 for the chain IS. A stud 48 on the stand has pivoted thereon a lever 49 which extends over the cylinder 4'! for actuation by chain 16 and is attached to a rod 50 which controls the box operating mechanism [5. When lever 49 is down mechanism 15 will lower the shuttle boxes so that shuttle SB is active, but when lever 49 is raised it acts through rod 50 to cause a, mechanism l5 to lift the shuttle boxes and place shuttle SD in active position. Mounted on stand 45 is an upright shaft which is given a complete rotation during each two succeeding picks of theloom by a driving mechanism not shown but well under stood. The upper end of shaft 55 has secured thereto a worm wheel 56 which meshes with a worm gear 51 on shaft 46 and in the present instance the latter shaft has an angular motion corresponding to the distance between adjacent bars on chain l6 during each two succeeding picks of the loom. In actual practice it is convenient to employ so-called multiplier mechanisms to control the operation of chain l6, but in order to simplify the description of my invention I have omitted the multiplier and have shown the chain l6 as having a movement every second pick of the loom.

The matter thus far described, except as noted hereinafter, is of usual construction and operates in the ordinary manner.

In order that the application of my invention may be understood I will describe one form of fabric which can be woven by it. In Fig. 12 I show successive square neckerchiefs N separated by dividing lines d and having marginal decorative corded stripes M, one near each selvage. The border stripes C, one on each side of each line d, are similar to stripes M and are made of double picks of decorative weft. The description to follow will be given in connection with the fabric shown in Fig. 12 but it is to be understood that the fabric set forth is merely illustrative and that additional selvage and cross stripes can be used if desired. In order to weave the fabric shown in Fig. 12 I provide a clutch drive for the shaft 4| which is controlled by the box pattern chain I6 and operated by upright shaft 55. Also, I modify the harness pattern chains 35 to permit the formation of two successive identical warp sheds when the chain l6 calls shuttle SD into action.

The cylinder 40 is driven by the mechanism shown in Figs. 2 to 6 to advance one step every pick of the loom except on those picks when shuttle SD is returning to box B2. The upright shaft 55 has secured thereto a worm wheel 60 which meshes with a worm gear 6| freely rotatable on a tube or sleeve 62 slidable on shaft 4!. The Worm 60 makes one complete rotation during each two succeeding picks of the loom and gives a one-sixth rotation to worm gear 6| each pick of the loom by means of two diametrically opposite actuating portions 63 and 64 which are connected by dwells 65. Worm gear Bl has a tubular extension 6! received by a bearing 68 secured to the stand 45. Bearing 68 prevents longitudinal motion of gear 6| along sleeve 62 by engaging the gear and a flange 69 integral with the sleeve 61. The flange has three equally spaced driving lugs 10, H and 12 as shown in Fig. 4. The right hand face of the worm gear as viewed in Figs. 2 and 3 is similarly provided with three driving lugs 15, 16 and 11, see Fig. 5. The lugs on the flange and the worm gear are spaced apart 120, but the lugs of the flange are displaced angularly with respect to the lugs of the gear by 60.

Secured to the left end of sleeve 62, as viewed in Fig. 2, is a collar 86 having a single driven lug 8|. The collar has a split hub to receive a screw 82 by which. the collar is clamped in fixed position on the sleeves 62, as shown in Fig. 6. The right hand end of the sleeve has secured thereto a second collar 85 which has a single driven lug 86 for engagement with the driving lugs on the right face of the worm gear. Collar 85 is split and clamped tightly to the sleeve by screw 81. The driven lugs are in longitudinal alignment, but could be displaced by if desired.

Collar 85 has a peripheral groove 88 to receive the upper end of an arm 89 secured to a small rocking shaft .90 mounted for oscillation on the stand 45. 'A second arm 9| also secured to shaft 90 is connected by rod92 to a lever 93 pivoted on stud 49 and extending over cylinder 41 and the box pattern chain I6. When lever 93 is down through action of spring 95 the sleeve will be moved to the left as shown in Figs. 1,2 and 3 to cause engagement of driven lug 86 with one or another of the driving lugs I5, I6 or 11. When lever "-93 is raised shaft/90 is rocked and sleeve 62 moves to the right to the position shown in Fig. .7 to cause engagement of the driven lug 8| with one or another of the driving lugs I0, II or I2.

Shaft 4| is provided with longitudinal slot 91 which receives a key 96 secured to the sleeve 62. The slot and key require the sleeve and shaft 4| to rotate together but permit-sthe sleeve to slide along the shaft so that it may be in either of the positions shown in Fig. lor '7.

Referring to Figs. '7 and 10 I have indicated the harness pattern chain 3.5 as composed of a series T to T of chain bars somewhat similar to the bars used in a double index dobby. Each bar has a row of primary indicators I00 including dark Xs representing pegs, and also another row of secondary indicators |0| including light Xs representing pegs. These indicators control the position of the fingers and 33, and on each bar the primary and secondary indicators are the same. 10 is a 2 and 2 twill.

Assuming the parts are in the position of Fig. l and the shaft 4| is rotating in a clockwise direction as viewed from the right-hand end of Figs. 2 and 3, the cylinder 40 will be given a forward movement of one-sixth of a rotation thereof every beat of the loom to move the pattern chain upwardly as seen in Figs. '7 and 10 by engagement of lug 86 with a lug on gear 6|. Re-

ferring to Fig. 10 it may be assumed that bar T moves to'controlling position under the dobby fingers when knife 2| is at the start of a workingstroke thereof so that the primary indicators I00 of bar T, the upper row, will be in control of the bottom lifter hooks 23.

On the next advanced movement of cylinder 40 on the following pick bar T2 will move to indicating position and its primary indicators, the lower row, will posit on the top hooks 22 immediately prior to the working stroke of the top knife 20. On the third pick cylinder 40 will again move forward and the third bar T3 will move to indicating position with its primary indicators, the upper row. positioning the bottom hooks 23. This operation with the primary indicators controlling the shedding continues during the weaving of the body of the fabric until chain I6 moves a roll I05 under lever 49 to effect movement of shuttle SD to active position. At this time a roll I06 on chain I6 moves under lever 93 'to rock arm 89 and move the sleeve 62 to the right, or to the position shown in Fig. 7. It is assumed that this lifting of the levers 49 and 93 occurs soon after bar TI moves under the fingers. The primary indicators at the top of bar T'I will therefore have given indication to the bottom hooks to produce a given warp shed and the bottom knife starts on its working stroke. Dur ng this pick and some time prior to the start of the working stroke of the top knife, the sleeve 62 will have been shiftedby lever 89 and lug 6| will move to a mid position between two Of the lugs on the flange 69 while shaft 4| is at rest. The next occurring movement of the worm gear 6| and flange 69 closes the gap between The draft of the chain shown in Fig. i

driven lug 8Iland one of the driving lugs I0 and H or "I2 without, however, rocking the sleeve 62 or the shaft 4|. It is for this reason that cylinder 40 remains at rest temporarily and the secondary bottom-indicators of bar TI indicate the top hooks. These last named indicators are identical with the other indicators of bar TI, hence the top hooks repeat the shed which was formed one pick earlier by the bottom hooks and the primary indicators of bar TI. This one pick interruption occurs during the two pick activity of shuttle SD and both of its picks are therefore laidin the same shed.

Thereafter, and considering that the chain shown in Fig. 9 moves upwardly, other rolls I06 continue to move under lever 93 as the box pattern chain 16 moves at two-pick intervals, thus holding the clutch mechanism in the position shown in Fig. 7 with the sleeve 62 to the right,

ling the shedding until the last of the rolls I06 has arrived under lever 93. On the next movement of the pattern box chain I6 that part of it shown in Fig. 9A starts to control levers 49 and 93, and a roll I01, similar to roll I05, moves under lever 49 to cause a second shifting of the shuttle boxes to render the decorative shuttle active again. Due to absence of rolls I06 from the chain shown in Fig 9A, however, the lever 93 falls under the action of spring 95 with attendantreturn of the clutch mechanism to the position of Fig. 1. Upon this return movement sleeve 62 moves to the left, see Fig. 9A, and lug 86 moves to a mid position between two of the lugs on the worm gear 6|, and as was described in the first instance, cylinder 40 again remains stationary during a one pick interruption until one of the driving lugs on the worm wheel engages driven lug 86. Cylinder 40 will then resume its step by step feed.

The" second interruption to the normal movement of cylinder 40 returns control of the shedding tothe primary indicators of chain 35 and this control is continued due to absence of rolls I06 on the remainder of the box pattern chain I6. The dobby is now in the condition it was at the start of operations except that lug BI is opposite a different space on the flange and lug 86 engages a different lug on the worm wheel 6 Weaving continues until another border is reached, whereupon the operations already described are repeated.

Referring further to Figs. 9 and 12, the number of picks between stripes C of adjacent fabric sections Nisdetermined by the number of rolls I06 between rolls I05 and I0! on chain I6, sixteen picks in the present instance. The line d of Fig. 9 corresponds to line (1 of Fig, 12 representing the division between two neckerchiefs.

The invention has been described in connection with a scarf or neckerchief having a single decorative stripe at one of its borders, but the invention is not thus limited inasmuch'as two adjacent borders will always have an even number of decorative stripes and the operations will be substantially the same as'already described in connection with two border stripes, the smallest even number possible.- Where more border 'stripes are used there will be additional sections of the box pattern chain l6 provided with the rolls I66, but the principle of operation will be the same as that already described.

The draft shown in Fig. 10 is for the usual twill weave. The invention is equally applicable, however, to other weaves. In Fig. 11 the draft represents chain bars P to P with their indicators in position to produce a plain weave. As in Fig. 10, the primary indicators of Fig. 11 include heavy Xs and the secondary indicators include light Xs. As in the case with the twill weave, weaving of the plain fabric can continue unde control of the primary indicators to any selected bar, after which an interruption in the movement of the bar for one pick will be caused by movement of lever 93 and weaving will then continue under control of the secondary indicators. When the second border stripe is called by the box pattern chain there will be another one-pick interruption after which the primary indicators will again be in control.

Since two successive picks are in the same shed, some means is needed at the right hand side of the loom opposite the structure shown in Fig. 8 to hold the first pick laid by the shuttle SD while the second pick is being laid on the return stroke of the shuttle. Such mechanisms are well known in the art and may take the form of catch cords or selvage hooks but are not illustrated herein.

From the foregoing it will be seen that I have provided simple means for repeating a shed when the shuttle carrying the decorative weft is active so that both of its picks will be beaten up in one shed to produce a corded effect. It Will further be seen that this result-is accomplished by means of a harness pattern chain each bar of which carries two rows of identical indicators and that the chain is moved at one-pick intervals so that ordinarily only one row of each bar will control the dobby. When the decorative shuttle is called by the box pattern chain, however, there is a one-pick interruption in the movement of the harness pattern chain and control of the harnesses passes to the other and Previously idle rows of indicators. It will also be seen that the loss of one pick is due to the fact that the lugs which are rigid with the sleeve 6| shift to a mid position between their driving lugs and thus require one rocking'of the worm gear 6| before driving of the cylinder 40 can be resumed. Furthermore, the control for the clutch mechanism which drives the harness pattern chain is derived from the box pattern chain which calls the decorative shuttle into active position.

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

1. In pattern mechanism to control loom harnesses to produce a given weave with difierent warp sheds on successive picks of the loom followed by successive similar sheds after which production of the given weave is resumed, arness actuating mechanism to produce warp sheds. a pattern chain to control the harness actuating mechanism comprising bars each having primary and secondary rows of indicators, the successive rows of primary and secondary indicators arranged to produce said given weave, the primary and secondary rows of any bar arranged to cause the harness actuating mechanism to produce the same shed, means normally acting to move the chain to caus the bars to move one at a time at one-pick intervals to controlling position with respect to the harness actuating mechanism during the production of said given weave, and mechanism to interrupt movement of the pattern chain by said means to hold a selected chain bar in indicating position for successive picks when said similar successive sheds are to be formed.

2. A pattern mechanism to control the harnesses of a loom to produce a given weave wherein warp sheds on successive picks are normally different but wherein the weave is interrupted to produce two similar successive warp sheds, harness actuating mechanism to produce said warp sheds, a pattern chain having bars each with primary and secondary rows of indicators, the primary and secondary rows of indi cators of any given bar being arranged to produce similar sheds, and the primary and secondary rows of successive bars arranged to produce different sheds, means to advance the chain so that the bars move successively at one-pick intervals to controlling position with respect to said harness actuated mechanism to cause the latter normally to produce different sheds on successive picks, and mechanism to interrupt the operation of said means for one pick to retain a given bar in indicating position for two successive picks so that the primary and secondary rows of indicators of said given bar will cause said harness actuating mechanism to interrupt said given weave and produce two successive similar sheds.

3. In pattern mechanism to control loom harnesses to produce a given weave by formation of different warp sheds on successive picks which are interrupted to produce two similar successive sheds, a dobby mechanism including upper and lower sets of lifter hooks and their lifter knives operative to produce warp sheds, a pattern chain to control the hooks comprising a series of bars each having primary indicators for one set of hooks and secondary indicators for the other set of hooks, the primary and secondary indicators of any given bar effective to position the hooks of the two sets similarly to produce similar sheds and the indicators of successivebars arranged to effect diiTerent successive settings of the sets of hooks relatively to their knives to produce different successive sheds, means to move the bars one at a time at onepick intervals to indicating position to control said hooks, one bar on one pick to control one set of hooks and the next bar on the next pick to control the other set of hooks, and mechanism to interrupt the operation of said means for one pick of the loom and thereby maintain one bar in indicating position for two successive picks when said given weave is to be interrupted to cause the primary and secondary indicators of said one bar to cause said set of hooks to effect pr0dllcti0n of two successive similar sheds.

4. In pattern mechanism to control loom harnesses to produce a given sequence of diiferent sheds on successive picks interrupted by two successive similar sheds, dobby mechanism to produce the warp sheds including upper and lower sets of lifter hooks and their lifter knives, a pattern chain comprising bars to control said hooks, each bar having primary indicators for one set of hooks and secondary indicators for the other set of hooks, the primary and secondary indicators of any bar arranged to efiecti similar setting of their corresponding sets of hooks, means normally to move the bars. one at a time at. onepick intervals to indicating position. to cause the primary indicators of successive bars to control said sets of hooks alternately to effect the production of said different sheds, and mechanism to interrupt the operation of said means for one pick of the loom after a selected bar has moved to indicating position to cause both the primary and the secondary indicators of said selected bar to control both of said: sets of hooks to produce two similar successive sheds when said interruption in the weave occurs, said means effective after said interruption to cause the secondary indicators on bars moving successively to indicating position to control said sets of hooks alternately.

5. In pattern mechanism for a loom having shifting shuttle boxes and operating with harness frames to produce a given sequence of different warp sheds on successive picks interrupted by two successive similar sheds, harness actuating mechanism for the harnesses to cause the latter to produce sheds, a pattern chain for said harness'actuating mechanism comprising a series of bars each having primary and secondary indicators, means normally operative to move the bars one at a time at one pick intervals to indicating position to cause the primary indicators of successive bars to efiect the productionof the different successive sheds in said sequence, and mechanism controlled by the shuttle boXes when the latter shift to interrupt the operation of said means for one pick and thereby maintain one of the bars in indicating position for two successive picks, the secondary indicators of said one bar being similar to the primary indicators of said bar and acting to cause repetition of the shed'corresponding to the primary indicators of said one bar.

6. In pattern mechanism for aloom having shifting shuttle boxes and operating with harnesses normally operative to produce a given sequence of different warp sheds on successive picks, a dobby mechanism including two lifter knives and two sets of hooks therefor, pattern-mechanism comprising a series of bars having primary and secondary indicators each capable of effecting control of said sets of hooks, means normally operative to move the bars one by'one at one pick intervals to indicating position and cause the primary indicators of successive bars to be normally effective to cause the hooks to produce the different successive sheds of said sequence while the secondary indicators are ineffective to control the hooks, the secondary set of indicators of each bar being similar to the primary set of indicators of the same bar, and mechanism operating when the shuttle boxes shift to interrupt the operation of said means for one pick and thereby maintain one bar in indicating position for two successive picks so that the primary and secondary indicators of said one bar will exert the same control over the two sets of hooks to cause the production of two successive similar sheds, said means thereafter operative to move the bars one by one at one pick intervals to indicating position and cause the secondary indicators of successive bars to be effective to cause the hooks to continue production of the different sheds of said sequence.

'7. In pattern mechanism for loom harnesses to produce a given sequence of different warp sheds on successive picks followed by an interruption of two successive similar warp sheds after which said sequence is resumed, harness actuating mechanism for the harnesses to cause the latter to produce warp sheds, a pattern chain for said actuating mechanism comprising bars each having a set of primary and a similar set of secondary indicators, means to move said bars one at a time at one-pickintervals to controlling position with respect to said actuating mechanism and cause the latter to effect formation of sheds in said sequence prior to the interruptionunder control of the primary sets of indicators, and mechanism operating when the shuttle boxes shift to interrupt the operation of said means for one pick and thereby maintain one bar in controlling position for two successive picks, the secondary set of indicators of said one bar effective to cause the actuating mechanism to form the shed correspondingto the second of said two successive picks similarly to the precedingshed, said means thereafter operative to move the bars one at a time at one-pick intervals to controlling position to effect resumption of said sequence under control of the secondary sets of indicators;

8. In pattern mechanism for a loom having warp harnesses, actuating mechanism for the warp harnesses to cause the latter to produce successive sheds, a pattern chain to control the actuating mechanism comprising a series of bars each having primary and secondary sets of indicators, means normally operative to move the bars one at a time at one-pick intervals to indicating position with the primary sets of indicators effective to cause said actuating mechanism to produce a given sequence of warp sheds, the primary and secondary sets of indicators-of successive bars each capable of causing the actuating mechanism to produce said given sequence of warp sheds, and the primary and secondary sets of indicators of each bar being capable of causing the actuating mechanism to produce the same warp shed, and mechanism to interrupt the operation of said means for one pick of the loom after the primary set of indicators thereof have controlled the actuating mechanism to produce a given shed and maintain said bar in control position for the following pick so that the sec ondary set of indicators thereof will cause the actuating mechanism to effect production of the same shed, said means thereafter moving the bars one at a time and at one pick intervals to indicating position with the secondary sets of in-' dicators effective to cause the actuating mechanism to continue said sequence.

9. In a loom dobby having a pattern chain cylinder with a shaft secured thereto, a sleeve slidable along but held against angular relative movement with respect to the shaft, a gear surround-' ing the sleeve, driving lugs formed c-nthe gear, a member having a driven lug secured to the sleeve, means to move the sleeve along the shaft to move the driven lug into and out of driving relation with respect to said drivin lugs, said shaft, sleeve and gear being in supporting relation with each other, and a bearing for said gear to prevent longitudinal movement thereof along the shaft when the sleeve moves longitudinally.

10. In a loom dobby having a pattern chain cylinder with a shaft secured thereto, a sleeve surrounding said shaft and slidable therealong but held against relative angular movement with respect to the shaft, a driving gear loosely mounted on the sleeve, two sets of driving lugs rotating with and on opposite sides of said gear,

driven means on said sleeve having a driven lug on each side of said sets of lugs, a bearing for said gear between said sets of lugs to prevent movement of the gear longitudinally of the shaft, said shaft, sleeve and gear being in supporting relation with each other, and means to shift said sleeve to move one driven lug into engagement with one set of driving lugs and the other driven lug out of driving relation with respect to the other set of driving lugs.

11. In a loom dobby having a pattern chain cylinder with a haft secured thereto, a sleeve surrounding said shaft and slidable therealong but held against relative angular movement with respect to the shaft, a pair of driven lugs fixed with respect to the sleeve and moving longitudinally therewith along the shaft, an actuating gear surrounding and loosely mounted on the sleeve, a set of lugs on said gear to drive one of the driven lugs, a flange rigid with and rotating with the gear, a second set of driving lugs on said flange for engagement with the other driven lug, said shaft, sleeve and gear being in supporting relation with each other, a bearing between said gear and said flange to support the gear and prevent longitudinal movement thereof relatively to the sleeve, and means to move the sleeve along the shaft to move one of said driven lugs out of engagement with the corresponding set of driving lugs and move the other driven lug into engagement with the other set of driving lug corresponding thereto.

12. In a loom having shifting shuttle boxes and a harness pattern chain cylinder driven normally at one-pick intervals by a clutch which is shiftable from one position to another position to effect a one-pick interruption in the movement of said pattern chain cylinder, a box chain having bars which move successively to indicating position at regularly recurring intervals to control the shuttle boxes, one bar of said box chain having a box indicator roll aligned with parts of other bars of the box chain formed without box indicator rolls, means controlled by said box chain to shift the shuttle boxes to move one of said boxes into active position when said one bar having said box indicator roll is in indicating position and effect a second shifting of the shuttle boxes to move said one shuttle box out of active position when one of said other bars formed without a box indicator roll is in indicating position, mechanism to move the clutch from, one of said positions to the other of said positions thereof, and a row of clutch indicators on said box chain starting with said one bar having said box indicator roll and extending along said other bars and effective when said one bar moves to indicating position to cause said mechanism to move the clutch from one position to the other position thereof and maintain said clutch in said other position as said other bars moves to indicating position.

13. In a loom having shifting mechanism for two shifting shuttle boxes one of which is normally active and the other of which is normally inactive, the loom having a harness pattern chain cylinder normally given a step by step movement at one-pick intervals by a clutch when the latter is in one position and sustaining a one pick interruption in the drive thereof when the clutch moves to another position, a box chain having bars moving regularly and progressively at two pick intervals to indicating position to control the shuttle box shifting mechanism, a box indicator roll on one bar of said box chainrwhich when in indicating position causes said shiftin mechanism to shift said normally inactive shuttle box into active position, shifting means for the clutch, clutch indicator means on said one bar of said box chain operative when in indicating position to cause said shifting means to move the clutch to the other of said positions and thereby effect a onepick interruption in the step by step movement of the pattern cylinder by said clutch, the next bar of said box chain to move to indicating position being formed without a box indicator roll and causing said shifting mechanism to move said normally inactive shuttle box back to inactive position, and a clutch indicator on said next bar of said box chain similar to the first clutch indicator and cooperating with said shifting means to maintain said clutch in said other position upon return of said normally inactive huttle box to inactive position.

14. In a loom having shifting mechanism for shifting shuttle boxes and having a harness cylinder and pattern chain therefor provided with harness bars, driving mechanism for the cylinder shiftable to either of two positions in either of which said driving mechanism normally advances said pattern chain each pick of the loom to place the harness bars successively in indicating position, said driving mechanism when shifting from one position to the other position thereof effecting a one-pick interruption in the movement of said pattern chain to maintain a harness bar in indicating position for two successive picks of therloom, a box chain having box bars moving successively and at two pick interval to indicating position, shifting means to move said cylinder driving mechanism from one of said positions to the other position thereof, one of said box bars when in indicating position cooperating with said shifting mechanism to shift said shuttle boxes and place a given box in active position, said box bar also causing said shifting means to shift said cylinder driving mechanism from one position thereof to the other position thereof, and the next box bar to reach indicating position causing said shifting mechanism to shift said given shuttle box to inactive position and cause said shifting means to maintain said cylinder driving mechanism in said other position.

CARL P. BERGSTROM.

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