US2219771A - Drive for jacquards for terry looms - Google Patents

Description

Oct. 29, 1940. H. v. FOSTER DRIVE FOE JACQUARDS FOR TERRY LOOMS Filed June 17, 1939 4 Sheets-Sheet l INVENTOR HERBERT V. FOsTER $36. 2 A-rroauev 029,19 0. H. V.FO$TER 2,219,771

DRIVE. FOR JACQUARDS FOR TERRY LOOKS Filed June 17, 1939 4 Sheets-Sh eet 2 o- O FIE] o Q o 55 I 0 G 62 o H W! I I05 0 5 t {-13- IO 75 I. O l a O 8 I06 0 F- 95 W 0 I 1 6 I 8 I W /-57 q qb so 1 l"|||l |l lll|'|| l 72 s 6 I r, O 4

x -0 q, I I I, (F I 75 1 H' Y I] I II luvzu'ron HERBERT V Fos'rm ATTORNEY Oct. 29, 1940. .H v ER 2,219,771

DRIVEFOR JACQUARDS FOR TERRY'LOOMS Filed June 17, 1939 4 Sheets-Sheet 3 FIG .5

ATTORNEY '0ct.29, 1940;- M H. v. FOSTER DRIVEFDR JACQUARDS FOR TERRY LOOMS Filed June 17, 1939 4 Sheets-Sheet 4 INVENTQR HERBERT \A FOSTER fie fi ATTORNEY Patented Oct. 29, 1940 2,219,771 7 q DRIVE FOR JACQUARDS FOR TERRYLOOMS 1 Herbert V. Foster, Providence, R. L, assignor to Crompton & Knowles Jacquard & Supply Company, Pawtucket, R. 1., a corporation of Massa chusetts Application June 17, 1939, Serial No. 279,698

8 Claims.

This invention relates to improvements in jacquard mechanism for looms and it is the general object of the invention to provide a jacquard more particularly adapted for the weaving of terry fabrics having figured patterns.

In weaving so-called three pick terry fabrics three beats of the lay are required to complete one row of tufts across the cloth. The weft is held in a rearward position for the first two picks and then is given a full forward motion with the third pick, the pile warp lying between the picks and the preceding row of tufts being looped when all three picks are beaten up. The loom therefore operates on a three-pick cycle.

When the pile warps and the loops formed from them are controlled so as to produce a fancy pattern it has been customary heretofore to have a separate card on the jacquard for each pick of the loom, necessitating three cards for one row of terry tufts. It is an important object of my present invention to economize on the cards by providing a jacquard so constructed and operated that one card will suflice for the three picks for each row of tufts.

In my co-pending application Serial No. 222,184 I set forth a jacquard which accomplishes the foregoing results by the use of cams for raising the knives of the jacquard in such an order that at any instant in the jacquard operation one knife will be rising, the second knife will be descending, and the third knife will be dwelling in low position, each knife in its turn at threepick intervals rising for one pick, then falling for one pick, and thereafter remaining down for one pick. In my aforesaid application I- claim broadly means for giving the knives the sequence of movements just described, but I have found that under some conditions of jacquard operation a set of cranks possesses certain advantages over the cams, such for instance as speed of operation, and it is a further object of my present invention to efiect the advantages set forth in that application by means of cranks instead of cams. The cranks give a continuous motion to certain jacquard parts and this I believe contributes to the higher speed attainable by their use.

In the description which follows I have set forth certain parts of my invention as disclosed in the aforesaid application together with the group of cranks which effect the knife movements.

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 accompanyingdrawings, wherein a convenient embodiment of my invention is set forth,

Fig. 1 is a side elevation of the upper part of a loom having attached thereto a jacquard made according to my present invention,

Fig. 2 is an enlargement of a portion of the upper part of Fig. 1, showing the cylinder operating mechanism,

Fig. 3 is an enlarged side elevation of the upper part of Fig. 1, with the sprocket wheel removed,

Fig. 4 is a detailed section on line 4-4 of Fig. 3,

Fig. 5 is an end view taken in the direction of arrow 5, Fig. 3, v

Fig. 6 is a plan View taken in the direction of arrow 6, Fig. 3, I

Fig. 7 is a horizontal section on lineVl-l, Fig. 3, v

Fig. 8 is a diagrammatic view of a weave when the pattern effect is obtained by reversing the location of colored tuft warps from one side to the other side of the fabric, a

Fig. 9 is a diagrammatic cross section of the fabric made according to the weave set forth in Fig. 8 after the tufts have been beaten up,

Fig. 10 is a diagrammatic'view of a weave in which the patterned effect is obtained bythrowing all of the figured terry warps onone side of the cloth,

Fig. 11 is a view similar to Fig. 9 but showing the fabric made according to the weave set forth in Fig. 10, i y Figs. 12 to 15 are diagrammatic views showing the-successive steps informing a row of terry tufts,

Figs. 16 and 1'7 show two sets of cards punched to produce the weaves shown in Figs. 8 and 10, respectively,

Fig. 18 is a diagrammatic view showing the relation of the knives, pairs of jacks, jacquard cylinder and cards, and the lifter cords, two needles entering holes in a card and two being pushed back by blank places on the card, and

Fig. 19-is a graph showing the relation of the crank motions and the support for the warp lifter jacks. I

In order that the invention may be more readily understood I will first describe the types of patterned terry fabrics set forth in Figs. 8 and 10. .For convenience in illustrating the weave I have shown the picks of filling separated in groups of three, the groups being indicated at I 75. weaving of the pattern, being the same for both to VII, inclusive, and the picks of each group being indicated ata, b, and c, in the order in which they are laid by the shuttle. It is to be understood that there are two different sets of warp threads in terry fabrics, the first of which forms the ground weave and is tight throughout the weaving of. the fabric, while the second set is slackened periodically at three-pick intervals to permit the formation of tuft piles. Each of these sets of warp threads .is interwoven with the picks of filling, the ground warps having always the same relation with respect to the filling and undergoing no change when the pattern is formed, while the terry'set will also sustain the same relationship to the picks of filling while unpatterned terry is being woven, but the terry warps change their relationship with respect to the picks of filling at the beginning and ending of a patterned figure. The relation of the terry warps with respect to the picks of filling will be unchanged throughout the weaving of the figures. The jacquard to be described hereinafter controls the terry warps and the usual cam harnessi mechanism not shown is employed for the weaving of the ground warps.

"Referring to Fig. 8, the terry warps 25 and 26 are represented at the left hand of the figure as atthe top and bottom, respectively, of the shot of fillingIa. In this type of weave the terry warps may be of different colors, the warp 25 passing undershot Ib and over shot Ic. The lower warp 26"has the opposite relation with respect to these shots and leaves the group Iunder the warp 25. The "spaceib'etween shots Icfand 1111 represents the length of terry warp which is to make the tufts pile. That part of the weave already described constitutes a normal non-p'atterned part of the fabric before the patterned area is reached. When the location of the terry warps is to be reversed the relation will be that shown in group III. The relation of terrywarps in this groupwill be the reverse of that shown in group I, the upper-warp 25' passing under shot IIIa, after whichits "relationship with respect to the shots of filling in group III will be as indicated, the lengthof terry warp 25 between shot IIIc and IVd' from which the terry tuft is formed being now on the under side of the fabric. In a similar manner theterry warp 28 is on the top of the '.fabric. The interweaving of the groups IV and V- will be similar to that of group "III, and it is to be understoodthat there will be as many groups similar to IV and V as are required by the figure being woven.

When the terry 25 is to be returned to the top .of filling and'the two sets of terry warps will be -.the next upper three reading to the right being formed of warp26, while the remainder of the upper tufts are again formed of the set25. The

reverse pattern effect appears on the bottom of the cloth. V

f Referring to Fi 10, the upper and lower terry warp threads 2] and, 28 at the left hand end sustain the same-relation to theshots of group I and Has in the previous weave, but in this instance.

the set 28 remainsunchanged throughout the the body and pattern, the warp 28 passing over the center shot of each group and under the other two. The warp 28 is therefore not necessarily controlled by the jacquard since it has a simple invariable three-shot cycle, and a three pick cycle cam harness mechanism as commonly used may be employed.

The other warp 21, however, is changed so that at times it is on the upper part of the fabric, as suggested at the left and right hand ends of Fig. 10, and at other times parallels the warp 28 to form the pattern as suggested in the intermediate part of Fig. 10. Under these conditions warp 2! will be controlled as is warp 25.

The fabric produced by the weave shown in Fig. 10 is set forth in Fig. 11 where the right and left hand ends of the fabric have piles on both sides, whereas the intermediate portion has all of the piles thrown to the under side, the upper part being blank to form the pattern.

It will be seen by referring to Figs. 8 and 10 that the upper set of warps starting at the left hand end indicated at 25 and 21 undergo a change when the pattern is reached and also when it is concluded and that in Fig. 8 the lower warp 26 has a similar but opposite relationship. In order to simplify the description the mechanism will be described as though it were to weave the fabric shown in Fig. 10, but it will be understood that the jacquard cards can be punched to produce the weave of Fig. 8, as will be set mechanism is well known and is thought to need no further description other than tosay that the first two picks of a cycle are beaten up to a position' behind the fell, as in Fig. 13, while the third pick is beaten up to the first two as in Fig. 14, and then on the same beat all three shots are beaten to the fell of a cloth, thereby bending the terry warps to form tufts as in Fig. 15. The lay may be driven by the usual connector 33 actuated by the top or crank shaft 34 of the loom.

I The jacquard J comprises cross timbers 35 mounted on uprights 36 supported from the floor and has a frame 31. I provide three sets of vertically reciprocating knives indicated at 4|, 42 and 43, each set comprising several knives which move together. The knives 4| are carried by a rack 45 which is raised and lowered by links adjustably connected to a vertically rocking lever 6|.

The'lever 6| is connected by rod 14 to a crank rotated by shaft 46 journaled in an auxiliary frame 42 on the timbers. Knives 42 are carried by a'rack 41 connected'by links 52 to lever 62 which is connected by rod 15 to a second crank 12 also rotated by shaft 46. The third set of knives 43 is mounted on the third rack which is Vertically reciprocated by links 53 connected to driving lever 63 which in turn is connected by rod 16 to a third crank 13 also rotated by shaft 46. The cranks will be described in more detail presently in connection with Figs. 3 and 5. Vertical guide rods 49, are provided for the several racks and supported by frame 31 to require the knives to move vertically in fixed paths as the cranks rotate.

,The cranks H, 12 and 13 are all driven by shaft 46 in equiangular relationship, adjacent cranks being spaced apart by an angle of around the 5 axis of shaft 46. Crank I3 is set-screwed to shaft 46, see Fig. 5, and has a. wrist pin 13a,

see Fig. 3, for adjustable head 56 on rod I6. Se-

cured to the pin TM is a plate 13b"which is fastened to a second plate 12b carrying'a wrist pin 72a for the adjustable head or rod I5 and similar to head 56. Pin 12a is secured to a plate 12c attached to plate 'IIb, and the latter carries a third wrist pin II a for the adjustable head at the bottom of rod I4. Pin Ila is secured toa crank II set-screwed on a stub shaft 460. carried by an auxiliary bearing 46b, see Fig. 5. Plates.

12b and 120 may be considered as forming cranks I2, while the parts set-screwed to shafts 46 and 46a constitute the crank I3 and II, respectively. Stub shaft 46a is coaxial with shaft46, and all the cranks turn about the axis common. to these two shafts. Slots 69 in the cranks and plates permit variation of the amount of motion tobe.

imparted to levers 6|, 62 and 63.

Rotation of shaft 46 is accomplished by the mechanism shown in Fig. 1 which includes a sprocket gear 65 fastened to the shaft 46 and driven by a chain 66 trained around a sprocket 'I'I fast on crank or top shaft 34. Sprocket 65 is three times the diameter of sprocket 11, so that shaft 46 is given one complete rotation for each three rotations of the shaft 34, or picks of the loom.

The card cylinder is operated by a cam 96 secured to shaft 46 and having a groove 6| to receive roll 62 on lever 93 fulcrumed at 56. A bell crank lever 65 moving about a fixed axis 66 has driving connection with lever 63 through an adjustable link 97 and in turn is connected by a second link 98 to a driving head 96 adjustably secured to a rod I66 slidable horizontally on the jacquard frame. The outer end of the rod I66 has secured thereto a cylinder support indicated generally at I6| for supporting rotatably thereon the jacquard cylinder I62. An operating pawl I63, Fig. 3, pivoted at I64 to the jacquard frame has a hooked head I65 to engage successively the several pins I66 formed in the corners of the cylinder at one end. The matter just described is of common construction .and'except for the cam 96 may be made according to accepted practice.

As shown in Fig. 2 cam 66 has two low points H6 and III with a high intermediate run 2 connecting these points on one side of the shaft 46 and a still higher run II3 on the opposite side of the shaft. When the roll 62 approaches one of the low points the parts are rocked in such a direction as to move the cylinder I62 to the left or in toward the needles H5 and when run H2 is occupied by the roll 62 the cylinder is moved away from the needles a slight amount not suflicient however to cause engagement of the pawl I63 with one of the pins I66. As the cam' moves in the direction of the arrow Fig. 2, the other low point then operates to move the cylinder back toward the needles, after which the high run I|3 comes into play to move the cylinder at its maximum distance away from the needles .and cause turning of the cylinder by the pawl I63 in well-known manner to present a new pattern surface.

The cylinder has trained thereover a series of jacquard cards C, C2, G3, etc., which are presented to the needles one at a time every third pick of the loom by the mechanism just described and shown in Fig. 2. These cards are shown in more detail in Figs. 16 and 1'7.

Fig. 18 shows-four needles each controlling a pair-of jacks together with four sets of knives.

It will be understood that the jacquard will have a number of needles and pairs. of jacks depending upon the number of terry warps to be controlled, but this description will be limited tothe needle and'jacks which control the terry warps of one longitudinal row of terry tufts, it being understood that the remaining needles and jacks will operate in a similar manner.

As shown in Fig. v18 each group of three knives is associated with two upright jacks II 8 and N9, the first jack having a hook |2| for engagement with knife 4| while the second jack 9 has hooks I22 and I23 for engagement with knives 42 and 43 respectively. The hooks I 22 and I23 point in opposite directions and are so related that when one of them lies in the path of the knife corresponding thereto the other hook will be out of the path of its knife so that but 7 but when both jacks are down the lifter cord and terry warp controlled thereby are in lowposition.

Each needle I|5 has a pair of loops I36 by which it controls the pair of jacks H8 and H9 and has the usual spring |3I to hold the needle in normal out position with the hooks I2I and I23 in the paths of their knives 4| and 43, respectively, while hook I22 will be out of the path of its knife 42. This relation is shown at the right hand pair of jacks in Fig. 18. When the needle is pushed in or moved to the left as viewed in Fig. 18 both jacks controlled thereby change their relative position with respect to the associated knife, hooks |2I and I23 moving clear of their knives while hook I 22 is placed over its knife 42. This relation is shown in the left hand pair of jacks H6 and Ill, Fig. 18.

Before continuing the description of Fig. 18 I will describe the nature of the knife motions and'the jacks H6 and H6. The graph shown in Fig. 19 represents the character and time of motions of the knives and thelifter jacks and the part played by the support I26 in maintaining the jacks in low position for one pick of the cycle. In Fig. 19 the three sinusoidal curves L, M and N represent the rising and falling motions of the knives 4|, 42 and 43, respectively, and the mid-line RS represents time or degrees of loom crank shaft motion. The knives are moved by the cranks shown in Fig. 3 and because of the fact that these three cranks are spaced equally around the shaft '6 the curves L, M and N will be separated by one pick or 366 of loom time. the reversal effected by the levers 6|, 62 and 63 means that an up motion of the knives and the curves in Fig. 19 correspond to a down motion of the cranks.

Considering curve L and knife 4| to which it corresponds, the knife will rise on one pick of a loom to reach a high positionindicated at 262 in Fig. 19, after which it will descend to low point 263. Since it is necessary to have a dwell of the jacks in low position for one pick it is necessary to-provide for an'idle motion of knife 4| It should be'borne in mind that loom time.

way down, or in the bottom shed, the hook I25 will engage the support I26 to preventfurther descent of the jack. In Fig. 19 the dashed line |26a corresponds to the location of the support- I26 and the points of crossing between curve L and line I26a, indicated at 204 and 205 are approximately one pick apart. From this it will be seen that although knife 4| continues to move in the lower part of its range of motion, it does so while out of supporting relation with respect to the jacks and it is for this reason that the dwell of the jack in low position for one pick is accomplished.

In a similar manner, knife 42 will have a motion as indicated by curve M, and since it is one pick later than curve L, knife 42 when descending will deposit a jack on support I26 at about the same time that ascending knife 4| can start to lift the jack previously held in low position by the support I26. Likewise curve N corresponds to the motion of knife 43.

It will be seen from Fig. 19 that each of th three curves L, M and N has a portion thereof which dips below the line |26a and that the dippings below this line are approximately one pick apart, and further that each curve remains below line I26a. for approximately a pick of the.

loom. By the relation shown in Fig. 19 knife 4| and any jack held thereby will have reached the high point 202 and will start down at approximately the same time that knife 42 in its up motion can engage another jack to start lifting the same, this point being represented at 206 in the graph. This same relation exists also between knives 42 and 43 and later between knife 43 and knife 4| for the beginning of another cycle.

In my previously mentioned co-pending application the down motion of the jacks was accomplished by holding the knives temporarily stationary for one pick by means of dwells in the cams. This same dwell of the jacks is accomplished herein by means of the support I26 and the fact that the knives continue to move in the lower part of their range While out of engaging position with the jack for one pick of the loom. I have found that the cranks permit a higher speed of the jacquard than was possible with the cam due in part at least I believe to the fact that the knife motions as set forth herein are continuous instead of intermittent as in my earlier case.

Returning now to Fig. 18 it will be convenient to bear in mind that a punched hole in the cardhas the same effect on needle 5 as though the card were not in indicating position, such as,

would be the case if the cylinder were moved out to be operated by the pawl I03, and itis also convenient to remember that after knife 42 has engaged hook I22 when rising the position of hook one pick and falls during the next pick, and the outward card feeding and return motions of the cylinder occur during the greater part of two.

picks or beats of the loom.

Considering first the weave shown in Fig. 10

for a period of approximately one pick :or 360 of This dwell of the jacks in low posi-: tion is caused'by the support I26 showninFign 18. This support is fixed on. the jacquard and, so located that when the warp thread is all the and assuming that a card is presenting a punched hole 21a to needle I I5, a knife 4| will rise to lift hook I2I during the vdescent of knife 43 and thereby raise terry' warp 21 for the laying thereunder of shot Ia. Knife 4| then starts down and a knife 42 starts up without engaging hook I22 so that warp 2'! will be down and shot Ib can pass over it. As soon as the normal time for engagement of hook I22 by knife 42 is passed in the ascent of knife 42 the cylinder is moved out by decline II3 of cam 90 to be given a quarter turn by the pawl I03.

As knife 42 starts down a knife 43 will start up and will engage hook I23, since the latter is normally positioned over knife 43 by the corresponding spring I3I, this condition existing when the card is away from indicating position. Warp 21 therefore is raised again for the passage thereunder of filling shot 10. This sequence continues so long as unfigured terry warps are to be woven by warp 21 and the latter will form terry tufts on the top surface of the fabric. As many unfigured rows of tufts as are needed will be thus formed, one additional row being provided and formed by unit or group II as shown in Fig. 10.

During the manipulation of warp 21 just described an opposite control will be exercised for terry warp 28. A blank space 28a on all the cards shown in Fig. 17, corresponding to the weave of Fig. 10, controls a needle 4 which positions a second pair of jacks H6 and III corresponding respectively to jacks H0 and. H9. In the sequence for warp 28 a knife 4| will rise without lifting jack II6, a knife 42 will then lift jack II! and a knife 43 will then rise without lifting jack III despite the fact that the cylinder is out because jack III is stillhooked on a knife 42. Warp 28 forms the terry tufts on the bottom of the fabric throughout the weave shown in Fig. 10, and a further understanding of the manipulation of warp 28 will be gotten by the description to follow of the manipulation of warp 21 by which the latter is placed in the bottom of the fabric.

At each complete out motion of the cylinder a new card will be placed in controlling position facing the needles. Cards C, C2 shown in Fig. 17 are punched with holes 2111 and left blank at 28a to produce the manipulations of warps 21 and 28, respectively, as shown in groups I and II, Fig. 10.

It is assumed that the figured pattern will start at group of shots III, Fig. 10, in which case card C3, Fig, 1'7, will have that part thereof controlling needle H5 left blank at 21b, and as low point N0 of cam 90 moves the cylinder in to place this card in indicating position, hook I21 will be moved out of the path of knife 4|. Knife 4| therefore riseswithout lifting warp 2'! and the latter will be under shot IIIa. During up motion of knife 4|, however, knife 43 is descending and in engagement with hook I23 from the previous cycle, and jack H9 is therefore under a strain from needle I I5 tending tobend it to the left as viewed in Fig. 18. In order to relieve this bending strain the cylinder is backed off slightly by run II2 of cam 90 as soon as the normal time for engagement of hook I2I by knife 4| during ascent of the latter has been passed. This backing off of the cylinder, which occurs once for each three pick cycle of the loom, is not enoughto cause turning of the cylinder by pawl I03. When descending, knife 43'loses control of hook I23 by reason of support I26 before knife 42 rises to a pointwhere it can pick up a jack. LoW

point II I of cam 90 now returns the cylinder and card to the left as viewed in Fig. 3 to give an indication for hook I22 just before the ascending knife 42 reaches a level corresponding to line I26a. Fig. 19. Knife 42 will then raise hook I22 and warp 21 will be above shot IIIb'. The cylinder is moved all the way out by incline II3 of cam 90 to cause turning by pawl I03 to place the next card in controlling position.

Knife 42 now holds both hooks I22 and I23, and as previously described, this will determine the position of hook I23 on the next pick. As knife 43 ascends hook I23 will be held out of its path because hook I22 is on knife 42, and warp 21 will therefore be down at the end of the up motion of knife 43 so that shot 1110 can pass over warp 21. This places warp 21 in the bottom shed and its tuft loops will be on the underside of the fabric along with those of warp 28 to form the pattern. As many such cycles are repeated as the pattern demands, units or groups IV and V being shown as similar to group III in Fig. 10.

When the figure is completed, as at group VI, card C6 then in control will present a hole 21a to needle H5, and the relation of warp 21 to the shots Wu and VII) and VIc will be as described in connection with group I. Warp 21 is thereafter restored to the top shed to form tufts on the upper side of the cloth, and the figure, so far as warp'21 is concerned, is completed. An additional card 01 is shown to form group VII which with group VI, continues the weaving of unpatterned fabric.

Fig. 11 shows the tufting of the fabric woven as indicated in Fig. 10 and suggests that the pattern is formed by the production of a blank space on one side of the cloth, the tufts on the opposite sides of the blanks being of double density. When the pattern is to-be formed as suggested in Figs. 10 and 11, therefore, there will be no change in the several cards with respect to their control of the lower tuft forming warp 28, and the variation in the punching of the cards will come only with respect to the control exercised by the cards on warp 21.

Turning now to the fabrics set forth in Figs. 8 and 9 it will be seen that warp 25 is controlled in a manner similar to that already described for warp 21. Warp 26 normally forming the bottom tufts, however, is controlled the same as that of warp 25 except in reverse direction, and wherever the cards have a hole punched for the lifting of warp 25 there will be a corresponding blank for lowering the warp 26, inasmuch as these two warps 25 and 26 are always on opposite sides of any given shot of filling. In this instance the pattern is produced by a color change, warp 25 being one color while warp 26 is of a different color, and there will be tuft loops on both sides of the fabric throughout the length of the pattern.

Fig. 16 shows a series of cards which will produce the weaves found in Fig. 8. In'these cards it is assumed that the upper left hand corner of each card is reserved for the control of the warp thread which normally provides the top tufts in an unfigured part of the cloth and that the lower left corner controls the warp threads normally forming the bottom tufts. In Fig. 16 card K corresponds to the group I of weft shots, Fig. 8, and the perforation 250. causes lifting of warp 25 over shot Ia, lowering under shot Ib, and lifting over shot Ic, as did hole 210; for warp 21 "in'the previous description; Cards K, K2, K6

and K1 have punched holes 250. in their upper left corners, while cards K3, K4 and K5 are blank in that corner, these cards being the same in this respect as the corresponding cards of Fig. 1'7, and therefore causing warp 25 to be like warp 21.

Warp 26 is disposed as is warp 28 in groups I, II, VI and VII and the corresponding cards K, K2, K6 and K1 are therefore blank in their'lower left corners, as are cards C, C2, C6 and C1. In

the three shot groups III, IV and V,however,

warp 26 is disposed oppositely to the arrangement of warp 28 in the corresponding groups of Fig. 10, and therefore where cards C3, C4 and C5 are blank in their lower left corners, cards K3, K4 and K5 are perforated, see Fig. 16, to cause warp 26 to lie under shots b of groups III, IV and V and over shots 0. and c of these groups. This arrangement of holes and blanks means that the warps 25 and 25 are always on opposite sides of any given shot'of filling, a condition already pointed out as essential to the weave shown in Fig. 8.

All three of the cranks 1!, 12 and 13 and also cam are capable of rotation in opposite directions, the cam 90 being symmetrical to permit this reversal. Because of this fact the jacquard may be driven either in the sequence already described or in the reverse sequence, the cranks having their settings altered on their driving shafts to produce results similar to those already described. 5

From the foregoing it will be seen that Ihave provided a jacquard for a terry loom having three knives each of which rises for one pick, falls for one pick, and has an idle motion for the third pick permitting a one pick dwell of the jacks in low position, and'that the three knives have these motions one pick apart so that one knife'is always rising on one pick, another is always falling'and another is always having the idle motion represented by that part of the graph in Fig. 19 below the line I26a. It will further be seen that the character of motion set forth hereinbefore is derived from three cranks which are equally spaced angularly around a shaft requiring three picks of the loom fora revolution and that'the continuous motion caused by the cranks contributespartly at least to the fact that the jacquard equipped with a crank motion for the knives can operate at a high speed.

The broad features of the structure set forth herein. are claimed in the previously mentioned co-pending application, while this application is limited to the structural advantages growing out of the continuous drive for the knives such as supplied by the cranks 1|, 12 and 13. I

Having thus describedv my invention it will be seen that changes and modifications may be made therein by those skilled inthe art 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 a jacquard mechanism for a loom to weave a terry fabric having successive three pick groups of weft, each' group being formed in a cycle and the last weft of one cycle being in the same shed arms, said crank arms to raise said knives one at a time and lift each knife during a pick of the loom to cause said terry warp to be in said given position at the conclusion of the rising of the first and third knives and be in said opposite position at the conclusion of the rising motion of the second knife.

2. In a jacquard mechanism for a loom to weave a terry fabric having successive three pick groups of weft, each group being formed in a cycle and the last weft of one cycle being in the same shed as the first weft in the succeeding cycle, and having a warp to be in a given position on one pick of the cycle, in the opposite position on the second pick of the cycle, andagain in said given position on the third pick of the cycle, a card to control the position of said terry warp for the three successive picks of a cycle,a shaft having a complete rotation for each cycle, three angularly spaced crank arms secured to and rotating with the shaft, and means cooperating with said card and including three knives each of which is connected to one of the crank arms the latter to lift one knife for the first pick of the loom and "lift the second knife for the second pick of the loom and lift the third knife for the third pick of the loom, any two knives being moved to down position with respect to the means cooperating with the card by the crank arms corresponding thereto when the other knife is in high position, said crank arms and the knives driven thereby causing the warp to be in said given position at the'con'clusion of the rising motion of the first knife, to be in said opposite position at the conclusion of the rising motion of the second knife, and to be again in said given position at the conclusion of the rising motion of the third knife.

3. In a jacquard mechanism for a loom to weave a terry fabric having successive three pick groups of weft, each group being formed in a cycle and the last weft of one cycle being in the same shed as the first weft in the succeeding cycle, and having a warp to be given two weaving positions, three separately movable knives, three crank arms having a complete rotation'for each cycle and said crank arms being spaced angularly, connections between the crank arms and the knives to give the latter a cycle of movement to be completed in three picks of the loom and during which cycle each knife rises for one pick of the loom, a card cylinder carrying a card, means to present the cylinder and card to indicating position for every cycle of the loom, and means controlled by the card when in indicating position and actuated by the knives to .the warp to the first position at the end of the rising motion of the third knife.

4. In a terry mechanism for a loom having a warp to be in a given position on the first pick of the loom, in the opposite position on the second pick of the loom, and again in the given position on the third pick of the loom, a card to control the position of the terry warp, three angularly spaced crank arms having a complete rotation every third pick of the loom, and means cooperating with the card and including two lifting jacks one with the single hook and the other with a double hook and three independently moving knives, one knife connected to each crank arm, there being one knife for each hook, to place three knives each connected to one of the crank Tsaidwarp inisaid given position when one of the kniveshas completed its lifting motion and to 'place said warp in the opposite position when the second knife has completed its rising motion and again place the warp in said given position "when the third knife has completed its rising movements extending through three successive picks of the loom and each knife to be moving up while another knife is descending and a third knife is dwelling in low position, a pair of terry controlling jacks one having one hook for one knife and the other jack having two hooks one for each of the remaining knives, a needle to position the jacks, a card to position the needle,

one of the crank arms to move the knife corresponding thereto up for the first pick and in engagement with one of the jacks to elevate the 1 same, the second crank arm to move the knife corresponding thereto up as the first knife descends and out of engagement with any hook to permitthe first knife to lower the jack in engagement therewith for the second pick of the loom,.and the third crank arm to raise the knife corresponding thereto to engage one of the hooks of the other jack to raise the same for the third pick of the loom, and means by which said jacks jointly control a terry warp thread.

6. In a jacquard mechanism for a loom'having a warp to be raised one pick, lowered the next pick and raised thethird pick, three lifting hooks for the warpgmeans to cause the warp to be raised when any hook is lifted, the warp being down when no hook is lifted, three lifting knives,

one for each hook, three angularly spaced crank arms having a rotation every third pick of the loom, each knife connected to a crank and the latter lifting the knives in consecutive order a during a cycle of three consecutive picks of the loom, said cranks effective to lift a knife for each pick of the loom, a .card to control'the hooks, means to move the card to controlling position relatively to the hooks every third pick of the loom, and means cooperating with the card and controlling the hooksto place two of the hooks in position to be lifted by the'first and third knives to rise during the cycle to raise the warp for the first and third picks of the 100m,: and said last named means placing the second hook out of the path of the second knife to rise in the cycle and thereby leave said warp in' low 'position for the second pick 'of the loom.

'7. In a jacquard mechanism for a loom having :warp to be raised for thefirst and third of three successive picks of the loom and to be in' low position for 'thesecond of said three successive picks, a pair of warp lifting jacks one of which has one hook and the other of which has two hooks, three hook engaging jack lifting knives, three angularly spaced crank arms having a complete rotation every third pick of the loom, each knife being connected to a crank arm and each crank arm connected to a knife, said crank arms to raise one knife and lower the other knife. and maintain the third knife in a substantially idle down position during a pick of the loom, the crank arms to raise the knives successively one at a-time so that three picks of the loom are required for a complete cycle of operations thereof, means to raise the warp when either jack is lifted, the warp to be down when both jacks are in low position, a needle to determine the position of the jacks with respect to their respective knives, a card to control the position of the needle preparatory to rising of the first and second knives, said cards and means cooperating to place the hook of the first jack out of the path of the first knife when the latter rises and acting to place one of the hooks of the second jack in the path of the second knife when the latter rises, means to move the card away from indicating position with respect to the needle subsequent to engagement by the second knife of the hook therefor, and said second knife and first hook of said second jack cooperating to hold the second hook of said second jack out of the path of the third knife when the latter rises while the card is out of indicating position with respect to the needle.

8. In a jacquard mechanism for a terry loom, three independently movable knives, each having a cycle of movements extending through three successive picks of the loom, three angularly spaced crank arms having a rotation every third pick of the loom, means to connect each knife with a separate crank arm, each crank arm moving the knife connected thereto up while another crank arm moves the knife connected thereto down and while the third crank arm gives the knife connected thereto an idle motion, a pair of terry warp controlling jacks one having one hook for one knifeand the other jack having two hooks one for each of the remaining knives, a support for the jacks to hold the latter in low position when said hooks are out of engagement with the knives and the latter have idle motions, a needle to position the jacks, a card to position the needle, one of said cranks to move the knife corresponding thereto up for the first pick of the loom and in engagement with one of the jacks to elevate the same, the second crank moving the knife connected thereto up as the first knife descends and out of engagement with any hook to permit the knife to lower the jack in engagement therewith to the low position determined by said supporting means for the second pick of the loom, and the third crank to raise the knife corresponding thereto to engage one of the hooks of the other jack to raise the same from the low position determined by said supporting means for the third pick of the loom, and means by which said jacks jointly control a terry warpthread.

HERBERT V. FOSTER.

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