US3066704A - Variable cloth take-up for looms - Google Patents

Description

Dec. 4, 1962 1. o. MOBERG VARIABLE CLOTH TAKE-UP FOR LOOMS Filed May 11, 1961 3 Sheets-Sheet 1 INYENTOR: IVAR O. MOEERG Bynnwahm g PATTERN MECHANISM 106 Ball; w

ATTORNEYS Dec. 4, 1962 0. MOBERG 3,066,704

VARIABLE CLOTH TAKE-UP FOR LOOMS Filed May 11, 1961 -3 Sheets-Sheet 2 INVENTOR. I AR MOBEEG ATTORNEYS Dec. 4, 1962 o. MOBERG VARIABLE CLOTH TAKE-UP FOR LOOMS 3 Sheets-Sheet 3 Filed May 11, 1961 INVENTORI I AR O. Moss-2G xtmbQL-flfiklmgl ATTORNEYS United States Patent ()fifice 3,066,704 VARIABLE CLQTH TAKE-UP FOR LO'UMES Ivar (l). Moberg, Spray, NC, assignor to Fieldcrest Mills, Inc, Spra N.C., a corporation of Delaware Filed May 11, 1961, Ser. No. 199,411 8 Claims. 3 139304) This invention relates to cloth take-ups for looms and is particularly devised for use with terry looms. This application is a continuation-in-part of my copending application Serial No. 80,867, filed January 5, 1961, and entitled Terry Motion for Looms.

The terry motion disclosed in said copending application is embodied in the conversion of a so-called Warner & Swasey-Sulzer weaving machine to a loom for Weaving terry cloth, such as towels, bedspreads and the like. Such looms are equipped with a cloth take-up mechanism having a take-up roll which is positively driven through a clutch means interposed in driving connections between the cloth take-up roll and the main drive.

As is well known, terry cloth of the type used for towels is generally woven in the form of spaced terry portions which are usually separated by relatively narrow bands or portions which are devoid of terry loops and which are generically known as cross borders, plain portions or drop-terry portions. When going into terry weaving from plain weaving, when weaving a plain portion or cross border of finer filling than that used in the terry portions, or in weaving fancy dobby or jacquard cross boarders, it is necessary to increase the number of picks per inch as compared to the picks per inch in the terry portions or" the cloth in order to avoid the occurrence of an undesirable crack or thin stripe between the two weaves when going into terry weaving from plain weaving and to insure the desired density of cross boarders of the character described.

It is therefore an object of this invention to provide novel means for intermittently momentarily stopping movement of a positively or directly driven cloth take-up roll of a loom of the character described at certain intervals during weaving.

It is another object of this invention to provide an improved pattern controlled means permitting continuous rotation of a positively driven cloth take-up roll during the weaving of substantial portions of cloth, and wherein the pattern controlled means is operable during weaving of other portions of cloth to intermittently stop rotation of the take-up roll at spaced intervals of relatively short duration so that said other portions of the cloth are more dense; i.e., they include a greater number of picks per inch than said substantial portions of the cloth.

It is a more specific object of this invention to provide a cloth take-up mechanism for a loom which includes a take-up roll, a gear operatively connected to the take-up roll, and a constantly driven shaft with an overriding clutch interposed between the shaft and the gear. The overriding clutch comprises a first means or feed dog carrier rotatable in fixed relation with the gear and a second means or starwheel rotatable relative to and driven by said shaft, but wherein the first and second means are normally releasably interconnected so the second means normally transmits rotation to the first means. A ratchet Wheel is normally yieldably maintained in a predetermined relationship to the first means, and a pattern controlled hold-back pawl is movable into engagement with and thus restrains movement of said ratchet wheel at predetermined intervals. Means are provided for repeatedly momentarily releasing or breaking the connection between the first and second means upon said first means moving a relatively short partial revolution relative to the thus restrained ratchet wheel so the second means rotates relative to the first means. Thereafter, upon said pawl being moved out of engagement with the ratchet wheel by the pattern mechanism, the ratchet wheel resumes rotating with the first means and restores the connection between the first and second means. It is apparent, therefore, that the driven shaft rotates relative to the gear whenever said hold-back pawl restrains move ment of the ratchet wheel and breaks the connection be tween said first and second means so as to stop rotation of said take-up roll at said predetermined intervals and thereby increase the density of the cloth being woven.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds, when taken in connection with the accompanying drawings, in which- FIGURE 1 is a somewhat schematic perspective View showing the connections between a cloth. take-up roll of a loom and a constantly driven shaft, with the overriding clutch means interposed therein, and also showing the improved pattern controlled means for stopping rotation of the take-up roll at predetermined spaced intervals;

FIGURE 2 is an enlarged elevation of the structure shown in the upper left-hand portion of FIGURE 1, with portions broken away and in cross-section;

FIGURE 3 is a fragmentary vertical sectional View, mostly in elevation, taken substantially along line 3-3 in FIGURE 2, wherein the parts of the clutch mechanism occupy that position in which rotation is transmitted from the constantly driven shaft to the take-up roll;

FIGURE 4 is a view similar to FIGURE 3, but wherein the parts of the clutch mechanism occupy a position in which the driving connection between the constantly driven shaft and the take-up roll is interrupted;

FIGURE 5 is a schematic view showing how ground and pile warps may be directed through harness and a reed to form cloth and showing how the cloth is trained about the take-up roll.

Referring more specifically to FIGURES 1 and 2 of the drawings, the numeral it broadly designates the frame of a loom of the type disclosed in my said copending application, of which a portion of one of the loom side frames is shown in phantom lines in FIGURES 1 and 2 designated at 11. The loom frame also includes a stationary frame member of girt 12 which is located adjacent the front upper portion of side frame 11.

The main drive of the loom, not shown, transmits continuous rotation to a take-up drive shaft 13 which extends forwardly and rearwardly and whose front portion is journaled in a bearing 14 carried by side frame 11. The front end of take-up drive shaft 13 has a worm 15 fixed thereon which meshes with a worm gear 16, a portion of whose teeth are represented by dash-and-dot lines in FIGURE 3.

Worm gear 16 is connected to one element of an overriding clutch or slip clutch broadly designated at 17, to be later described in detail, and which normally transmits continuous positive rotation from drive shaft 13 to a conventional cloth sand roll or take-up roll 20 through a train of gears 21-31. As is well known, the take-up roll 20 takes up the fabric or cloth C, as it is woven.

By referring to FIGURE 5, it will be observed that the cloth C passes forwardly from the beat-up point of the conventional reed 35, over and partially around a guide roll 36, from whence it passes rearwardly and down- Wardly substantially around the take-up roll 20, then over a press roll 37 and then downwardly about a cloth roll 40. In this instance, the idler roll 36 cooperates with a roll 41 in a manner fully disclosed in said copending application, for shifting the fell of the cloth C forwardly and rearwardly relatively to the beat-up point of reed 35 2% during terry weaving. Thus, rolls 36, 41 may be termed as fell shifter rolls.

The cloth C is formed of ground warps W and pile or terry warps P which are drawn from respective sources 43, 4d. The pile warps P pass downwardly from the source 44, substantially around an intermittently driven pile feed roll '45, over and partially around a press roll 46, forwardly of and past an idler roll 47, and beneath a whip roll 48. The ground warps W pass upwardly from the source 43 and over the rear shifter roll 41 and then forwardly in substantially parallel relation to the pile warps P. The warps W and P then pass through the usual harnesses or shed-forming heddles 53, from whence they pass through the oscillatable reed 35 to the fell of the cloth C. The loom is only shown schematically in FIG- URE 5, since it is fully disclosed in said copending application and a detailed disclosure thereof is deemed unnecessary in the present application.

Referring again to FIGURES 1 and 2, it will be observed that gear 21, which is connected to a second element of the overriding clutch 17, is journaled on a shaft 55 which may be fixed in side frame 11 and on which the corresponding end of take-up roll 29 is also journaled. The take-up roll has a hub 56 integral there with, or suitably secured thereto, through which shaft 55 extends, and on which gear 31 is fixedly mounted.

Gear 22 is journaled on a stub shaft of Gears 23, 24 and 25, 26 are journaled on respective stub shafts 61, 62, and serve as change gears. Stub shafts 6d, 61 and 62 are suitably secured to and project outwardly from side frame 11.

The gear 27, which is engaged by gear 26, is fixed on a shaft 63 journaled in and extending through side frame 11. The gear 28 is fixed on the inner end of shaft 63. Gear 28 meshes with gear 29 which is integral with or suitably secured to gear 30, and both of the gears 29, 30 are journaled on a stub shaft 64 suitably secured to and projecting inwardly from side frame 11. The gears 23, 24 are suitably interconnected or integral with each other and the gears 25, 26 are also suitably interconnected or integral with each other.

As heretofore stated, the overriding clutch 17 normally transmits continuous rotation from the constantly or continuously driven shaft 13 through the train of gears 21-31 to take-up roll 20. It is well known that the gears 21-31 are of such relative sizes as to impart rotation to the take-up roll 20 at a speed such as to normally produce a predetermined number of picks per inch in the cloth C as it is woven.

The overriding clutch 17 is provided so that reverse rotation may be imparted to the take-up roll 2d by manually rotating a hand wheel 66 whenever a defect in the cloth requires that a substantial number of picks be removed therefrom and that the cloth be let back. The overriding clutch 17 also serves another purpose and will now be described in detail.

As best shown in FIGURE 2, the hub of gear 21 is in the form of an elongate sleeve '70 on which the worm gear 16 is loosely mounted; that is, worm gear 16 may rotate freely on the hub 70 of gear 21. The hub of worm gear 16 projects outwardly and has a starwheel 71 integral therewith or suitably secured thereto, which is similar to a ratchet wheel and has circularly spaced tapered teeth on the periphery thereof generally designated at '72 (FIG- URES 3 and 4).

A segmental take-up dog carrier 73 is suitably secured to or formed integral with the hub "I'll of gear 21 and is disposed in close proximity to or in sliding engagement with the outer end surface of starwheel 71. Carrier 73 comprises a first means rotatable in fixed relation to the gear 21, and the starwheel 71 and worm gear 16 comprise second means continuously driven by shaft 13. A medial outer portion of take-up dog carrier 73 has a pivot pin 74 journaled therein on an axis spaced from and parallel to the axis of shaft 55. The inner end of pivot pin 74 has a medial portion of a double take-up dog 75 fixed thereon, and the outer end of pivot pin '74 has the outer portion of a cam lever or arm 76 fixed thereon.

The rear and front radially inward portions of take-up dog 75, with respect to the direction of rotation of worm gear 16, are provided with respective inwardly projecting prongs 8th, 81 whose rear surfaces are spaced apart a distance slightly greater than the distance between the distal surfaces of alternately spaced teeth 72 on the periphery of starwheel '71. Thus, take-up dog 75 embodies releasable means normally maintaining a driving connection between the starwheel 71 and the take-up dog carrier 73. Starwheel 71 generally advances one tooth 72 during one or more picks of the loom, depending upon the ratio be' tween worm 15 and worm gear 16.

During take-up of the cloth C with normal operation of the loom, the rear prong 89 is in engagement with the front surface of one of the teeth 72 of the starwheel 71. In this instance, the tooth engaged by prong lift is specifically designated at 72a and other adjacent teeth are designated at 72b, 72c, 72d and 722, in order that the operation of clutch 17 may be clearly described here inafter.

Rear prong 84B is yieldably held in engagement with tooth 72a, as shown in FIGURE 3, by a tension spring 82, one end of which is connected to a medial portion of cam arm 76 and the other end of which is connected to a spring anchor 84 projecting outwardly from take-up dog carrier '73. It will be noted that spring anchor 34 is located forwardly of cam arm '76 with respect to the direction of rotation of worm gear 16. The free end of cam arm '76 normally extends between the proximal surfaces of carrier 73 and a hub 85 of hand wheel 66, which hub is also loosely mounted or journaled on the outer portion of shaft 55.

A stop pin 36, projecting outwardly from the outer surface of take-up dog carrier 75 closely adjacent the periphery of shaft 55, is normally urged into engagement with the front surface of a segmental abutment 87 by a tension spring 96, one end of which is connected to a spring anchor 91 projecting outwardly from a rear radially outward portion of take-up dog carrier 73. The other end of spring 9% is connected to a spring post 92 project ing substantially radially outwardly from and being suitably secured to the hub 85 of hand wheel 66. Segmental abutment 87 is integral with and projects axially inwardly from the hub 85. Thus, hub 85 and carrier 73 are yieldably interconnected by spring as.

Since the gear 16 of overriding clutch 17 rotates continuously in a counterclockwise direction in FIG- URES 3 and 4 during operation of the loom, and starwheel 71 is fixed with respect to gear 16, it follows that, as long as prong is in engagement with any one of the teeth '72 on starwheel 71, dog 75 imparts rotation to take-up dog carrier in unison with rotation of worm gear 16. Spring 90 maintains the front surface of segmental abutment 87 in engagement with stop pin 86 and, thus, hub and hand wheel 66 are also normally rotated in a counterclockwise direction in FIGURES 3 and 4.

Now, if hand wheel 66 and its hub 35' are restrained from rotation, by means to be later described, during counterclockwise, forward, rotation of worm gear 16 and starwheel 71, carrier 73 rotates with starwheel 71 to move a cam surface a on the inner portion of cam arm 76 into engagement with the rear or trailing end of segmental abutment 87, thus causing carn arm 76, pivot pin '74 and take-up dog 75 to move in a counterclockwise direction relative to carrier 73 so as to move prong 80 out of engagement with the front surface of the corresponding tooth 72a of starwheel 71 as the free end of cam arm 76 engages the periphery of segmental abutment 87. In so doing, the other prong 81 of take-up dog 75 moves into the path of the second tooth 72c spaced forwardly from that tooth 72a previously engaged by prong 80.

It should be noted that, at the instant prong 8! moves free of tooth 72a, spring 90 imparts a quick snap-action reverse movement to carrier 73 in a clockwise direction, thus imparting like reverse movement to dog 75, stop pin 86, hub 70 and gear 21. This also turns back takeup roll a proportional amount determined by the intervening gears 2231. It should be noted, however, that the take-up roll 20 turns back such a slight amount that it cannot be detected or the clearance between the teeth of gears 21-31 may be such as to absorb the slight reverse movement imparted to gear 21 so that take-up roll 21) is simply stopped with each reverse snap-action of take-up dog carrier 73.

As heretofore stated, the prongs 8t 81 of feed dog 75 are spaced apart a distance slightly greater than the distance between distal surfaces of alternately spaced teeth 72 on the starwheel 71. This distance is such that, by the time prong 81 contacts tooth 720 under the influence of spring 90, the leading or front surface of prong 80 will then be disposed rearwardly of or to the right of the tooth 72a with which it had previously been in engagement.

Since take-up dog carrier 73 moves reversely very quickly whenever prong 80 moves clear of a tooth, such as tooth 72a, subsequent contact of the front surface of tooth 720 by prong 81 (FIGURE 4) throws prong 81 outwardly; i.e., prong 81 overrides tooth 720, thus insuring that prong St) is moved inwardly so as to come to rest against the leading surface of the next succeeding tooth 71e on starwheel 71. It should be noted that during said snap-action reverse movement of carrier 73, cam surface a of cam arm 76 moves away from the trailing or rear end of segmental abutment 37 so that tooth 72c may throw prong 81 outwardly, in the aforementioned manner, assisted by spring 32.

By the time stop pin 86 engages the front end of segmental abutment 87, prong 80 will have engaged the said succeeding tooth 72a on starwheel 71. It is thus seen that take-up dog carrier 73, hub 70 and gear 21 will have moved backward an angular distance approximately equal to the angular distance between the crowns of an adjacent pair of the teeth 72 relative to starwheel 71 and worm gear 16, with the result that, in effect, the cloth take-up roll 26) is stopped momentarily. If the hand wheel is still restrained from rotation, the cycle of reverse or backward movement of carrier 73, hub 70 and gear 21 is repeated as soon as starwheel 71 and carrier 73 have again rotated suificiently relative to hand wheel 66 and segmental abutment 87 to cause prong 80 to clear the corresponding tooth 72 on starwheel 71.

It should be noted that, during initial counterclockwise movement of carrier 73 relative to hub 85, the tension in spring 90 is increased until carrier 73 has moved far enough to cause prong 80 of dog 75 to clear the corresponding tooth.

Now, in order to intermittently restrain hub 85 from rotation during certain intervals of weaving, such as in forming cross borders or plain woven portions of relatively fine filling between adjacent terry loop portions of cloth, or when going into terry weaving from plain weaving, hub 35 has a ratchet wheel or cog wheel 100 fixed thereon which is preferably provided with forwardly inclined teeth with respect to the normal direction of rotation of form gear 16 (FIGURE 1). The teeth of ratchet wheel 100 are adapted to be intermittently engaged by a pattern controlled restraining element in the form of a hold-back pawl 101 suitably secured to a pivoted arm 1%2. Arm 102 is pivotally mounted, as at 103, on a bracket 104 carried by girt 12.

A medial portion of the shank of hold-back pawl 101 has one end of a cable or link 1115 pivotally connected thereto, which, as shown in FIGURE 1, extends to a suitable pattern mechanism 196. The pattern mechanism is shown schematically in the form of a legended block, since there are various types of pattern mechanisms which may be used for controlling the operation of hold-back pawl 101. For example, the pattern mechanism may be in the form of a jacquard or dobby driven by the loom, and is shown in the form of a dobby in said copending application, Serial N 0. 80,867.

During the weaving of terry portions of the cloth C, the pattern mechanism 106 holds hold-back pawl 191 out of engagement with ratchet wheel 1hr? so that worm gear 16 and gear 21, along with all the other parts of the overriding clutch 17 heretofore described, and the ratchet wheel 109, rotate in fixed relationship about shaft 55.

Now, in order to weave plain portions of cloth between adjacent terry portions of cloth of greater density than the terry portions and/ or to prevent the occurrence of thin stripes or cracks in the cloth at the junctures of terry woven and plain Woven portions thereof, the pattern mechanism 196 releases and permits pawl 1&1 to move downwardly into engagement with ratchet wheel 1% at predetermined spaced intervals where the pawl 1131 dwells during the formation of one or more picks, as desired. In so doing, ratchet wheel 1%, hand wheel 66 and hub d5 are restrained from rotation while worm gear 16, starwheel 71 and take-up dog carrier 73 continue to rotate until the trailing surface of segmental abutment 87 engages and moves outwardly the cam arm 76. As heretofore stated, prong 39 of take-up dog 75 then moves out of engagement with the corresponding tooth 72a, and spring 9@ moves take-up dog carrier 73 and gear 21 in the opposite direction relative to worm gear 16 and starwheel 71 until prong 86 engages the succeeding tooth 722, at which instant the relative positions of carrier 73 and hub 85 are substantially as shown in FIGURE 3 with prong against the front surface of tooth 72a.

Hold-back pawl 161 may remain in engagement with ratchet wheel 1% during a single reverse action of takeup dog carrier '73 or for any desired number of such reverse actions of carrier 73, according to a predetermined pattern. Thereupon, pattern mechanism 1% lifts pawl 191 out of engagement with ratchet wheel 1% and, since prong 80 of take-up dog '75 is then in engagement with the front surface of one of the teeth 72. (FEGURES 3 and 4) on starwheel 71, gear 21 then rotates in unison with Worm gear 16. Several picks of the loom may occur from the time ratchet wheel 1% is initially engaged and restrained by hold-back pawl 191 until a cycle in reverse movement of carrier 75 is effected and during any repeated cycles thereof, depending upon the ratio between worm 15 and gear 16. However, it is apparent that the stopping of the cloth take-up roll 2t may be readily predetermined by proper patterning of the pattern mechanism 1%.

In weaving a three-pick terry, for example, it has been found desirable to insert an extra pick of weft per inch of cloth when goin from drop-terry or plain weaving into terry weaving. This is also the case throughout the weaving of fancy cross borders and/ or cross borders hav ing a finer filling than the terry portions of the cloth. Accordingly, during the weaving of the latter portions of fabric, the pattern mechanism 1% permits hold-back pawl 181 to momentarily move into engagement with ratchet wheel 1% at regular or irregular intervals in operation of the loom, during which ratchet wheel 1% is restrained sufficiently to effect one reverse snap-action of dog 75 and its carrier 73. Of course, pawl 161 may remain in engagement with ratchet wheel 1% during two or more reverse snap-actions of dog 75 and carrier 73 during each interval in which pattern mechanism 1th) permits pawl 101 to engage ratchet wheel 16-3 depending upon'the desired density of the cloth. It is apparent that pattern mechanism 166 operates to raise and maintain pawl 101 out of engagement with ratchet wheel 1% so that normal weaving may be resumed for any predetermined number of picks until the pattern mechanism 1% again releases pawl 161.

The operation of clutch mechanism 17 has been given thus far with respect to stopping cloth take-up roll 2% predetermined amounts at pattern controlled intervals. If so desired, the cloth take-up roll 2%} may be advanced relative to the main drive of the loom simply by manually rotating hand wheel 66 in a counterclockwise direction in FEGURE 1, during which segmental abutment 87 (FIGURE 3) will engage pin 36 and rotate carrier '73 and gear 21 therewith relative to or faster than, and in the same direction as, arwheel '71 may be rotating. In so doing, prong 55% will contact and ride over any teeth 72 past which it may be moved. Spring 94 will subsequently urge prong btl against the front or leading surface of an adjacent tooth 72 when hand wheel 66 is released.

it is thus seen that l have provided a loom which takes up cloth at a predetermined number of picks per inch, through a positively driven take-up, with means for intermittently, at predetermined intervals, efiecting relative rotation between the drive and the take-up roll by intermittently stopping the tal-:eup of the cloth to thereby increase the density of the cloth during the weaving of selected portions thereof.

In the drawings and specification there has been set forth a preferred embodiment of the invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1. A loom having a cloth takeup mechanism including a gear and a constantly driven shaft, in combination with an overriding clutch interposed between and normally maintaining a fixed driving connection between said gear and said shaft, 21 wheel, yieldable means interconnecting said wheel and said clutch mechanism and causing said wheel to normally rotate in predetermined relationship with said gear, pattern controlled means for intermittently restraining said wheel from rotation with said gear at predetermined intervals of predetermined duration, means responsive to rotative movement of said gear relative to said wheel for breaking the driving connection between said gear and said shaft whereby said gear is free to rotate in a reverse direction relative to said shaft and said wheel under influence of said yieldable means, and means to restore the driving connection between said gear and said shaft when said gear is reversely rotated into said predetermined relationship to said wheel.

2. A structure according to claim 1 in which said wheel is a ratchet wheel, said pattern controlled means comprises a hold-back pawl normally disposed out of engagement with and being intermittently movable into engagement with said ratchet wheel to restrain the ratchet wheel from rotation with said gear.

3. A loom having a cloth take-up mechanism including a gear and a constantly driven shaft, in combination with an overriding clutch having first means rotatable in fixed relation with said gear, second means continuously driven by said shaft, means normally maintaining a driving connection between said first and second means, pattern controlled means for momentarily restraining said first means from rotation with said second means and for then releasing said first means at selected spaced intervals, and means responsive to restraining said first mean for breaking the driving connection between said first and second means whereby said second means rotates relative to said first means and then the second means transmits rotation to the first means upon said first means being released.

4. A loorn having a cloth take-up mechanism including a gear and a constantly driven shaft, in combination with an overriding clutch including a take-up dog carrier mounted to rotate with said gear, a take-up dog on said carrier, at starwheel having spaced teeth thereon and continuously driven by said shaft and being free to rotate relative to said gear, said take-up dog normally engaging said starwheel whereby forward rotation is transmitted from said starwheel to said gear, pattern controlled means for momentarily restraining said carrier from rotation and for then releasing said carrier at predetermined spaced intervals, means responsive to restraining said carrier for moving said take-up dog out of engagement with said starwheel, means yieldably moving said carrier in a reverse direction upon said take-up dog being moved out of engagement with said starwheel whereby said gear rotates in a reverse direction relative to said starwheel, and means to return said dog into engagement with said starwheel during rotation of said carrier in the reverse direction whereby said starwheel again transmits forward rotation from the shaft to the gear.

5. A structure according to claim 4 wherein said pattern controlled means comprises a ratchet wheel axially arranged with res ect to said carrier, said yieldable means consisting of spring means interconnecting said ratchet wheel and said take-up dog carrier, a pattern controlled hold-back pawl normally spaced from said ratchet Wheel and being operable to move into engagement with and restrain movement of said ratchet wheel, means operable automatically upon restraining rotation of said ratchet wheel relative to said starwheel for moving said take-up dog out of engagement with a corresponding tooth on said starwheel, said spring means being so arranged as to rotate said carrier in said reverse direction relative to said starwheel, and said means to return said dog into engagement with said starwheel being operable to move the dog into engagement with a succeeding tooth on said starwheel whereby said take-up dog resumes transmitting rotation from the starwheel to the take-up dog carrier and the gear.

6. A loom having a cloth take-up mechanism including a gear and a constantly driven shaft, in combination with an overriding clutch comprising first means rotatable in fixed relation with said gear, second means continuously driven by said shaft, a ratchet wheel coaXially arranged adjacent said first means, yieldable means interconnecting and normally maintaining a predetermined relationship between said ratchet wheel and said first means, releasable means normally maintaining a forward driving connection between said first and second means, a hold-back pawl adjacent said ratchet wheel, a pattern mechanism operatively connected to said pawl for controlling movement of said pawl into and out of engagement with said ratchet wheel and whereby engagement of the pawl with said ratchet wheel restrains the ratchet wheel from rotation so the first and second means rotate relative to the ratchet wheel, means responsive to rotation of said first means relative to the ratchet wheel for breaking said connection between the first and second means, said yieldable means serving to move said first means in a reverse direction relative to said second means upon breaking of the connection therebetween and to restore said predetermined relationship between said ratchet wheel and said first means, and means to thereby restore said driving connection between said first and second means when said yieldable means restores said predetermined relationship between said ratchet wheel and said first means.

7. In a loom having means for weaving cloth, a cloth take-up roll, a constantly driven shaft, and a train of gears connected to said take-u roll; clutch means interposed between one of the gears of said train and the constantly driven shaft, said clutch means comprising a starwheel driven by said shaft, said starwheel having spaced teeth thereon, a rotatable take-up dog canrier fixed to said one of the gears, a take-up dog eccentrically pivotally mounted on said carrier and having a prong thereon, means yieldably maintaining said prong in engagement with one of the teeth on said starwheel, pattern controlled means for rocking said take-up dog relative to said carrier during weaving of selected picks of the loom to move said prong out of engagement with said one of the teeth and into the path of another of said teeth whereby the starwheel may rotate relative to said carrier, and said pattern controlled means being operable to release said take-up dog so the prong may remain in the path of said other tooth on said starwheel whereby the starwheel is advanced one tooth relative to said one of the gears fro-m the time that said prong moves out of engagement with said one of the teeth until it is engaged by said other tooth.

8. In a loom having means for weaving cloth, a cloth take-up roll, a constantly driven shaft, and a train of gears connected to said take-up roll; clutch means normally maintaining a fixed driving connection between one of the gears of said train and the constantly driven shaft, said one of the gears of said train including a hub, said clutch means comprising a starwheel journaled on said hub, a fixed driving connection between the starwheel and the constantly driven shaft, said starwheel having a plurality of spaced teeth on the periphery thereof, a take-up dog carrier fixedly connected with said hub, a take-up dog eccentrically pivotally mounted on said carrier and normally engaging one of the teeth on said starwheel whereby the starwheel transmits rotation to the hub and its gear through the medium of said take-up dog and said carrier, a ratchet wheel axially arranged with respect to said hub, means yieldably interconnecting said ratchet wheel and said take-up dog carrier and urging said carrier in a reverse direction relative to said ratchet wheel, a pattern controlled hold-back pawl normally spaced from said ratchet wheel and being operable to move into engagement with and restrain movement of said ratchet wheel, means operable automatically upon restraining r0- tation of said ratchet wheel relative to said starwheel for moving said take-up dog out of engagement with the corresponding tooth on said starwheel whereby said carrier, said hub and its gear are moved reversely relative to said st-arwheel by said yieldable interconnetcing means, means to return said dog into engagement with a succeeding tooth on said starwheel during said reverse movement of said carrier whereby said starwheel resumes the imparting of rotation to the take-up dog, the take-up dog carrier, the hub, the train of gears and the take-up roll, and said pattern mechanism being operable to move said holdback pawl out of engagement with said ratchet wheel following a predetermined number of said reverse movements of said carrier whereby said ratchet wheel resumes rotation with said carrier.

References Cited in the file of this patent UNITED STATES PATENTS 1,322,715 Merrill NOV. 25, 1919 1,652,998 Bartholomew Dec. 20, 1927 1,963,808 Robertson June 19, 1934 2,611,396 Rinne et a1. Sept. 23, 1952

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