Terry motion for looms
United States Patent [191 Nelson TERRY MOTION FOR LOOMS [75] Inventor: Howard I. Nelson, Grafton, Mass.  
 [73] Assignee: Crompton &amp; Knowles Corporation, New York, N.Y.  
  22 Filed: Oct. 23, 1973 21 Appl. No.: 408,702  
 [52] U.S. Cl. 139/26 [51] Int. Cl D03d 39/22 [58] Field of Search 139/25, 26, 27, 188, 190  
 [56] References Cited UNITED STATES PATENTS 3,265,095 Nichols et al. 139/26 Apr. 15, 1975 FOREIGN PATENTS OR APPLICATIONS 1,294,299 4/1969 Germany 139/26 Primary Examiner*I-Ienry S. Jaudon [57] ABSTRACT Mechanism for reciprocating the lay in cycles of partial beat-ups followed by a full beat-up, comprising a movable lay drive assembly which reciprocates the lay and means for altering the position of the assembly so that it will be in a first position for a full beat-up and in a second position for a partial beat-up.  
 12 Claims, 10 Drawing Figures PATENTEDAPR 1 51975 FIG.  
 SHKET 1 BF 5 PATENTEDAPR 1 5 i975 saw u or 5 FIG.7  
 PATENTEUAPR 1 SISYS sumsnr5 FIG.|O  
 TERRY MOTION FOR LOOMS BACKGROUND OF THE INVENTION The present invention relates generally to a lay drive for terry looms including terry looms in which weft is inserted from an outside filling supply source.  
  Terry fabric is woven in cycles of three or more weft insertions or picks. there being the usual. wherein the lay is driven to a point just short of the fell of the fabric for two picks and then to the fell for one pick. The first two picks are called partial beat-ups and the third is referred to as a full beat-up which forms the terry pile loops from the length of terry warp yarn which extends between the two beat-up positions.  
  In conventional terry looms partial beat-ups are produced by pivoting the reed at one end and causing it to swing back a sufficient amount at the time of partial beat-up. Although mechanical means such as cams and the like are used to swing the reed back at the time of partial beat-up. the reed itself is spring loaded towards the full beat-up position. At higher speeds the inertia of the reed causes problems in trying to maintain exact beat-up positions. In addition, if the reed bed is not stiff enough. it tends to bend and cause a variation in terry loop length across the width of the fabric. If the reed bed is made stiffer. weight is added to the lay creating additional inertial problems for the lay driving mechanism.  
  Other types of terry looms provide means for shifting the fell line of the cloth to produce the partial and full beat-ups. The disadvantage of this approach is that the entire take-up has to be rolled back for &#39;a full beat-up. To shift the fell. the cloth and warp yarns all have to be shifted back. This involves the take-up mechanism as well as the letoffmechanism. In addition. there is a sawing action of the warp yarns on the heddles due to the constant reciprocation of the warp yarns. This is likely to produce additional wear within the area of the heddle eyes.  
 SUMMARY OF THE INVENTION It is a principal object of the present invention to provide a simple and reliable beat-up means for weaving terry which will overcome the disadvantages of the conventional terry looms described above.  
  The object of the invention is accomplished by providing a movable lay drive assembly which reciprocates the lay the same amount for every pick. Actuating means are provided for moving the entire lay drive assembly to a first or forward position to provide a full beat-up and a second or rearward position to provide a partial beatup.  
  It is a further object of the invention to include mechanism for disabling the drive for the lay drive assembly wherein the assembly is arrested in its first or forward position for weaving sections of *tlat cloth for a border or pattern effect.  
  The present terry lay drive may be used in looms of any type which utilizes a pivotally mounted reciprocating lay. However, when the invention is applied to outside weft supply looms. additional mechanism is required. In looms where weft is transferred by a weft guide or presenter to a weft inserter for each pick. the position of the guide-with respect to the weft inserter is very critical. During partial beat-up, the weft inserter does not come as far forward as it does during full beatups so that weft will not be transferred from the presenter or guide to the inserter. It is a still further object of the invention to provide a movable weft guide and means for positioning the guide to a first position during full beat-ups and to a second position during partial beat-ups so that weft will be transferred in both beat-up positions. I  
 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front elevation of the preferred embodiment of the invention as applied to a terry loom of the outside weft supply type with portions broken away:  
  FIG. 2 is a vertical section on line 22 of FIG. I. looking in the direction of the arrows and showing the beat up means. with portions broken away:  
  FIG. 3 is a vertical section on line 3-3 of FIG. 2, looking in the direction of the arrows and showing details of the lay drive assembly;  
  FIG. 4 is a vertical section on line 44 of FIG. I. looking in the direction of the arrows and showing the actuating means when the lay drive assembly is in the full beat-up position;  
  FIG. 5 is a view similar to FIG. 4, showing the actuating means when the lay drive assembly is in the partial beat-up position;  
  FIG. 6 is a vertical section on line 66 of FIG. 1. looking in the direction of the arrows and showing the mechanism for positioning the weft guide;  
  FIG. 7 is a view looking in the direction of arrow 7 of FIG. 6;  
  FIG. 8 is a diagramatic perspective of mechanism for disconnecting the actuating means to produce flat cloth;  
  FIG. 9 is a diagrammatic view of a first modification: and  
  FIG. 10 is a diagrammatic view of a second modification.  
 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. I. there is illustrated a terry loom generally indicated by the reference numeral 12. This loom is of the type wherein weft is inserted from outside supply packages, indicated at P. by a weft inserter. The particular loom which is illustrated utilizes a projectile for inserting the weft and which is propelled through the shed alternately from both sides by mechanism disclosed in US. Pat. Nos. 3,315,709, dated Apr. 25. 1967 to Svaty and 3,330,305, dated July 11, 1967 to Svaty. et al. This type of loom is shown only as an example. as the invention may be applied to any type of loom which employs a pivoted reciprocating lay.  
 Loom 12 includes a frame 14, weft inserting mechanism generally indicated at 16, a dobby or pattern control mechanism 18, heddles 20 and connecting means 22 from the dobby 18 to the heddles 20.  
  Referring to FIG. 1-4, the loom also includes a lay 24 which is pivotally mounted on elongated tubular supports 26 mounted to the frame 14. A drive shaft 28 extends through the supports 26 and across the loom. This drive shaft is rotated constantly by conventional loom drive mechanism. not shown. and makes one rotation for every two weft insertions or picks.  
  Located on shaft 28 is a lay drive assembly generally indicated at 30. This assembly includes a housing 32 pivotally mounted on shaft 28 and a gear 34 rotatably mounted to housing 32. One end of a crank connector 36 is pivotally connected at 38 to gear 34 at a point spaced from its center of rotation. The opposite end of connector 36 is pivotally connected at 42 to an intermediate lever 40 which is fixed to the lay. Gear 34, therefore. functions as a crank and reciprocates lever 40 and lay 24 once for each rotation of the gear.  
  A gear 43 is fixed to drive shaft 28 in driving engagement with gear 34 and makes one rotation for each two rotations of gear 34. Since shaft 28 makes one rotation for every two picks. gear 34 will make one rotation for each weft insertion and the lay will be reciprocated once for each pick. Housing and the lay will be reciprocated once for each pick. Housing 32 therefore functions as a lever pivoted about shaft 28 for supporting gear 34 for rotation about gear 43.  
  The actuating means for the lay drive assembly is generally indicated by the reference numeral 44 and comprises a second drive shaft 46 which makes one rotation for every three picks or three reciprocations of the lay. First and second discs 47 and 49, respectively, which form part of first and second eccentrics 48 and 50, respectively. are fixed to shaft 46. A .bell crank lever 52 is pivotally connected by an intermediate pivot 53 to the inner two prongs 54 of a four-pronged lever 56. The outer two prongs 58, of lever 56 each have a slot 60. Lever 56 is pivoted at 62 to the frame 14. A pair of links 64 are pivotally connected at their lower ends by adjustable pivots 65 within slots 60 for adjustment to any point along the slots. The other ends of links 64 are pivotally connected at 66 to a pair of intermediate levers 68 which are, in turn, pivotally connected at 70 to the frame 14. The lower ends of a pair of second links 72 are also pivotally connected at 66 to intermediate levers 68. The opposite ends of links 72 are pivotally connected at points 74 to opposite sides of housing 32. First and second arms 76 and 78, respectively. form part of eccentrics 48 and 50, respectively, and are pivotally connected at 80 and 82, respectively, to opposite ends of bell crank lever 52.  
  Eccentrics 48 and 50 are effective to move the intermediate pivot point 53 of bell crank lever 52 and rock lever 56 which. through links 64 and 72 and lever 68, causes housing 32 and the entire assembly 30 to rock around shaft 28. Since gear 43 is also centered on shaft 28, gear 34 will partially revolve around gear 28. Since lay 24 is operatively connected to the housing 32, it will also be rocked around shaft 28. By shifting the position of lay drive assembly 30, the entire reciprocating path of the lay will be likewise shifted, as will the beat-up position of the lay. The eccentrics 48 and 50 are timed so that the lay drive assembly 30 will be in a first position for one reciprocation of the lay to produce a full beatup and in a second position for two reciprocations of the lay to produce partial beat-ups. FIG. 4 shows the position of actuating means 44 when the lay drive assembly 30 is in its first position at the time of full beatup. FIG. shows the position of actuating means 44 when the lay drive assembly is in its second position at the time of partial beat-up. The timing and positioning of the eccentrics 48 and 50 are such that bell crank lever 52 is rocked around intermediate pivot 53 without appreciably moving the pivot for at least lof rotation of the eccentrics. This dwell occurs when the assembly is in its second position and extends from the first partial beat-up to the second.  
  The center lines of slots 60 in outer prongs 58 follow an arc swung from the center of pivot 66 when assembly, 30 is in its first position so that any adjustment of pivot along slot 60 will not alter the beat-up position of the lay. Any change in position of pivot 65 will. however, change the throw of link 64 and change the partial beat-up position of the lay.  
  It is contemplated that a single link could be connected from pivot 65 directly to pivot 74 in which case the center of slot 60 will extend along an arc swung from pivot 74 when assembly 30 is in its first position. It is also-contemplated that cranks could be used instead of eccentrics; or any other drive means which will drive a portion of arms 76 and 78 in a circle.  
 WEFT GUIDE Referring to FIGS. 6 and 7, there is a weft guide or presenter 34 and means. generally indicated at 86, for positioning the weft guide. This mechanism forms part of the invention when the invention is applied to an outside weft supply loom of the type wherein weft is supplied to a weft inserter by a weft guide or presenter at the beginning of each weft insertion. An example of such a loom is illustrated in US. Pat. 3,335,761 dated Aug. 15, 1967 to Bartosek, et al.  
  Referring to FIG. 6, guide 84 is mounted to a block 88 which is slidably mounted within a casing 90 for movement toward and away from the fell line 92 of the cloth.  
  Guide positioning means 86 includes an eccentric 94 mounted on drive shaft 46. A pair of rods 96 are fixed at their lower ends to eccentric arm 100, which forms part of eccentric 94, and are reciprocated along a nearly vertical line indicated by double headed arrow 102 once for each rootation of shaft 46. The upper.  
  ends of arms 96 are slidably mounted in a bearing block 104 which is pivotally connected at 105 to a bell crank lever 106 mounted to the frame 14 by a pivot 108. A central threaded rod 110 is fixed to bearing block 104 and extends freely through a bracket 1 I2 which is fixed to rods 96 at a position intermediate block 104 and eccentric 94, the lower end of this rod being slidably guided in eccentric arm 100. An upper spring 114 is loosely mounted on the upper portion of central rod 110 and is held in position against bracket 112 by an upper stop 116 threaded on rod 110. A lower spring 118 is loosely mounted on the lower portion of central rod 110 and is held in position against bracket 112 by a lower stop 120 threaded on rod 110. The upper end of bell crank lever 106 has a U shaped opening 122 within which a block 124 is slidably mounted. The lower end of a lever 126 is pivotally connected at 128 to block 124. The upper end of lever 126 is pivotally connected at 130 to block 88. Upward movement of rods 96 causes spring 114 to be compressed by bracket 112 against stop 116. This forces central rod 110 upward thereby rocking bell crank lever in a counterclockwise direction as viewed in FIG. 6. The effect of this motion of bell crank lever 106 is to position weft guide 84 to the partial beat-up position as indicated by dotted lines in FIG. 6. Downward movement of the rods 96 causes spring 118 to be compressed by bracket 112 against stop 120 and force central rod 110 downwardly. Downward motion of rod 110 rocks bell crank lever 106 clockwise to shift weft guide 84 to the full beat-up position to the fell 92 as shown in full lines in FIG. 6. The throw of eccentric 94 is great enough to cause weft guide 84 to move a much greater distance than the distance between the full and partial beat-up positions of the guide. Stops 134 and 135 in casing 90 are positioned to engage the upper end oflever 126 and limit its motion so that guide 84 will be positioned exactly to the full and partial beat-up positions. respectively. The springs 114 and 118 compensate for the additional lost&#34; motion of rods 96.  
  Since eccentric 94 is mounted on shaft 46. arm 100 will be reciprocated once for every three beat-ups. Stops 116 and 120 are positioned on rod 110 so that spring 114 will be compressed during a greater portion of the reciprocation of rods 96 than spring 118 to the extent that weft guide 84 will occupy the partial beatup position for two beat-ups and the full beat-up position for one beat-up during each rotation of shaft 46. In addition. this lost motion&#34; arrangement enables the weft guide to arrive at each of its beat-up positions sooner than would be possible if the full throw of the eccentric were utilized.  
 ONE ROTATION CLUTCH It is common practice in weaving terry cloth for towcls that individual towels include a section of flat weave or border where no terry loops are formed. In order to weave the borders, the lay must be brought to the full beat-up position for a plurality of continuous beat-ups. This is accomplished by disconnecting the shaft 46 from the loom drive while the lay drive assembly is in first or full beat-up position. The mechanism for doing this is illustrated in FIG. 8 and is referred to as a &#34;one rotation clutch.&#34; generally indicated at 136. Clutch 136 includes a driving member or toothed wheel 138 fixed to a constantly rotating input shaft 140 disposed in line with shaft 46 and a disc I42 fixed to shaft 46. Disc 142 has a slot 143 in its periphery for a purpose to be described. A disengageable connector or bell crank lever 144 is pivoted at 146 to disc 142. One end of lever 144 has a tooth 148 for engagement with the tooth of wheel 138 and is held in driving engagement by a spring 150. When lever 144 is in the position shown in FIG. 8, shaft 46 will be rotated at the same rate as shaft 140. The other end of lever 144 has an cxtending finger 152 for a purpose to be described. Detent means 154 are also included as part of the one rotation clutch 136 and include a lug 156 and a projecting finger 158 fixed to pivot 160. During the weaving of terry. detent means 154 are disposed in an inactive position which allows clutch 136 to remain in driving condition. When the pattern control mechanism 18 indicates a change from terry weave to flat weave, this indication will be transmitted to the detent means 154 by connecting means generally indicated by the reference numeral 162. The indication to change from terry weave to flat weave is considered a first indication&#34; and is effective to partially rotate pivot 160 in a clockwise direction as viewed in FIG. 8 and thereby lower lug 156 against the peripheral edge surface 164 of disc 142. Lug 156 will continue riding on surface 164 until slot 143 is reached. At this point. lug 156 drops into slot 143 while. at the same time, projecting finger 158 strikes extending finger 152 to rock bell crank lever 144 clockwise and lift tooth 148 out of engagement with wheel 138. Slot 143 is located so that clutch 136 will be disengaged when the lay drive assembly is in its first position and held in that position because of the lug 156 within the slot 143. When the invention is applied to an outside weft supply loom which includes a weft guide and means located on shaft 46 for positioning the weft guide. the weft guide will be in the full beat-up positionwhen the clutch 136 is disengaged. Flat weaving then occurs for a desired number of continuous beat-ups. When the pattern control mechanism 18 indicates a return to terry weaving, a secondindication is transmitted to detent means 154 through connecting means 162. This second indicationis effective to rock pivot counterclockwise to lift lug 156 out of slot 143 and lift projecting finger 158 out of engagement with extending finger 152. Spring 150 will then rock lever 144 counterclockwise and return tooth 148 into engagement with toothed wheel 138 and cause shaft 46 to again be driven from shaft 140.  
 FIRST MODIFICATION Referring to FIG. 9. there is shown a modified actuating means generally indication at 166 for moving the lay drive assembly 30 to its first and second positions. respectively. Actuating means 166 includes a drive shaft 168 which makes one rotation for every three beat-ups and a crank 170 fixed to shaft 168. A connector 172 is pivotally connected at 174 to crank 170 at one end and pivotally connected at 176 to lay drive assembly 30 at its other end. When the crank 170 is in the position shown in FIG. 9, lay drive assembly 30 is in its first position at the time of beat-up for a full beat-up. The pivot 174 is rotated in a circle indicated by dotted lines 178 and occupies the positions indicated at points 180 and 181 for the next two beat-ups. respectively. These two points are 120 apart and are each 120 from the position of pivot 174 in FIG. 9. When pivot 174 occupies either of the positions indicated at 180 and 181, lay drive assembly 30 will be in its second position at the time of beat-up for a partial beat-up. Although a crank is illustrated in this modification. it is contemplated that an eccentric could also be used.  
 SECOND MODIFICATION Referring to FIG. 10, there is shown a modified beatup means for weaving terry and indicated generally by the reference numeral 182. This modification includes a lay 184 fixed to a shaft 186 which is pivotally mounted on frame 14. A lay drive assembly generally indicated at 188 includes a gear 190 fixed to a shaft 192 which is rotatably mounted on lever 194. A crank 196 is fixed to shaft 192 and pivotally connected at 197 to one end of a connector 198. The other end of connector 198 is pivotally connected at 200 to the lay 184. Lever 194 is pivotally mounted on a drive shaft 202 which is rotatably mounted on frame 14. This shaft is driven by the loom drive mechanism at the rate of one rotation for every two weft insertions. A gear 204 isfixed to drive shaft 202 and also makes one rotation for every two weft insertions. Gear 190 is driven by gear 204 and makes two rotations for each rotation of gear 204 so that crank 196 reciprocates lay 184 once for every weft insertion. The lay drive assembly 188 is positioned by actuating means generally indicated at 206. Actuating means 206 includes a crank 208 fixed to a drive shaft 210 and a connector 212 pivotally connected at one end by a pivot 214 to crank 208 and at its other end by a pivot 216 to lever 194. Shaft 210 makes one rotation for every three beat-ups of the lay. Crank 208 is in the position shown in full lines in FIG. 10 when the lay 184 is at full beat-up position as shown in full lines. Crank 208 drives pivot 2l4 in a circle indicated by dootted lines 218. Following the full beat-up. pivot 214 will occupy positions 220 and 222 at the time of beat-up for the next two succeeding beat-ups. respectively. Points 220 and 222 are l apart and are each 120 from the position of pivot 214 as shown in FIG. 10. When the pivot 214 is at either of the point 220 or 222 lever 194 will be pulled back to the right as viewed in FIG. 10 and gear 190 will be partially rocked on gear 204 so that lay drive assembly 188 will occupy its second position as shown in dotted lines in FIG. 10. When the assembly 188 is in its second or dotted line position. lay 184 will be in its partial beat-up position at the time of beat-up as shown in dotted lines in FIG. 10. It is contemplated that an eccentric could be substituted for the crank 208. It is also contemplated that actuating means 44 of FIGS. 2-5 could be substituted for actuating means 206.  
 Having described my invention. 1 claim:  
  1. In a terry loom having a frame and weft inserting means, beat-up means comprising:  
 a. a lay pivotally mounted to said frame about a stationary axis;  
 b. a lay drive assembly for reciprocating said lay about said axis;  
 c. means for movably mounting said lay drive assembly on said frame for altering the beat-up position of the lay; and  
 d. actuating means for moving said lay drive assembly to a first position for a full beat-up and to a second position for a partial beat-up.  
 2. In a terry loom as described in claim 1 wherein said actuating means comprises:  
 a. a crank which makes one rotation for every three reciprocations of the lay; and  
 b. a connector. one end of which is connected to said lay drive assembly and the other end of which is connected to said crank. wherein said assembly will be in said first position for every third reciprocation of the lay and in said second position for the remaining reciprocations of the lay.  
 3. in a terry loom as described in claim 1 wherein said actuating means comprises:  
 a. connecting means. one end of which is pivotally connected to said lay drive assembly;  
 b. a bell crank lever pivotally connected at an intermediate point to the opposite end of said connecting means;  
 c. a first arm pivotally connected to one end of said bell crank lever;  
 d. a second arm pivotally connected to the opposite end of said bell crank lever; and  
 c. drive means for rotating a portion of the opposite ends of said first and second arms in separate circles, once for every three reciprocations of said lay so that said lay drive assembly is moved to said first position for every third reciprocation of the lay and to said second position for the remaining reciprocations of the lay.  
  4. In a terry loom as described in claim 3 wherein the means for moving said lay drive assembly are arranged so that said lay drive assembly substantially dwells in said second position for at least 120 of each rotation of the portions of said first and second arms which are rotated in a circle.  
  5. The terry loom as described in claim 3 wherein the means for operatively connecting the pivot of said bell crank lever to said lay drive assembly comprises:  
 a. an adjusting lever, one end of which is pivotally connected to said frame and the other end of which is pivotally connected to said bell crank lever at said intermediate pivot; and b. linkage means, one end of which is pivotally connected to said lay drive assembly and the other end 5 of which is adjustably connected to said adjusting lever along a path which changes the amount of motion transmitted from said adjusting lever to said lay drive assembly without changing the full beatup position of said lay. 6. In a terry loom as described in claim 1. beat-up control means comprising:  
 a. a pattern control mechanism; b. a one rotation clutch mechanism for driving said actuating means continuously and which. upon receiving a first indication, remains in driving en gagement until a specific point of its rotation is reached whereupon it becomes disengaged. and whereupon it becomes engaged upon receiving a second indication, said clutch mechanism being ef- 2O fective when disengaged to maintain said lay drive assembly in its first position for continuous full beat-ups; and  
 c. connecting means for providing first and second indications from said pattern control mechanism to said one rotation clutch mechanism. 7. In a terry loom as described in claim 6, wherein said one rotation clutch mechanism comprises:  
 a. a constantly rotating driving member; b. a driven member attached to said actuating means;  
  c. a disengageable connector for transmitting the rotation motion of said drive member to said driven member; and  
 d. detent means attached to said connecting means for disengaging said connector from its motion transmitting function and for locking said driven member at a point where said lay drive assembly is in its first position.  
 8. In a terry loom as described in claim 6, wherein said one rotation clutch mechanism comprises:  
 a. a continuously rotating input shaft;  
 b. a toothed wheel attached to said input shaft for rotation therewith;  
 c. an output shaft connected to said actuating means;  
 d. a disc attached to said output shaft, said disc having a slot in its outer periphery;  
 e. a bell crank lever pivoted to said disc one end of said lever being an extending finger and the opposite end having a tooth for engagement with said toothed wheel, wherein said disc will be rotated by said toothed wheel; and  
 f. detent means attached to said connecting means and controlled by said pattern control mechanism, said detent means having an inactive position which permits said input shaft to drive said output shaft and an active position which allows said detent means to engage the outer periphery of said disc and to drop into said slot for locking said lay drive assembly in its first position and for striking and extending finger to disengage said tooth from said toothed wheel.  
 9. In a terry loom having a frame and weft inserting means. beat-up means comprising:  
 a. a lay pivotally mounted to said frame;  
 b. a drive shaft;  
 c. a first gear fixed to said shaft for rotation therewith.  
 d. a lever. one end of which is rotatably mounted on said drive shaft;  
 e. a second gear rotatably mounted to the other end of said lever and in driving engagement with said first gear so that said second gear makes one rotation for each reciprocation of the lay, wherein movement of said lever causes partial rotation of said second gear about said first gear;  
 f. means for operatively connecting said lay to said second gear so that said lay is reciprocated once for each rotation fo said second gear; and  
 g. means for moving said lever to a first position for a full beat-up and to a second position for a partial beat-up.  
 10. In a terry loom as described in claim 9 wherein said means for operatively connecting said lay to said second gear comprises:  
 a. a crank connected to said second gear; and  
 b. a link, one end of which is pivotally connected to said crank and the other end of which is pivotally connected to said lay.  
 1]. A terry loom comprising:  
 a. means for forming a warp shed;  
 b. a lay which operates in cycles of partial beat-up followed by a full beat-up to the fell of the cloth;  
 c. a weft carrier which travels through the shed for inserting weft lengths from an outside supply source;  
 d. a movable weft guide for presenting weft to said carrier; and  
 e. means operating in timed relation with the movement of said lay for moving said weft guide to a first or second position wherein weft will be presented to said carrier in the first position during a full beatup and in the second position during a partial beatup.  
 12. The terry loom as described in claim 11 comprising:  
 a. a pattern control mechanism;  
 b. means under control said pattern control mechanism for causing said lay to be operated for a plurality of continuous full beat-ups;  
 c. a one rotation clutch mechanism for continuously driving the means for moving said weft guide and which. upon receiving a first indication remains in driving engagement until a specific point of its rotation is reached whereupon it becomes disengaged. and whereupon it becomes engaged upon receiving a second indication. saidclutch mechanism being effective when disengaged to maintain said weft guide in its first position; and  
 d. connecting means for providing first and second indications from said pattern control mechanism to said one rotation clutch mechanism in synchronism with the means for causing said lay to be operated for a plurality of full beat-ups.  
  UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION t PATENT NO. 1 3,877,492 DATED April 15, 1975 lNvENTOR(St Howard 1. Nelson It is certified that error appears it&#34;; the above-identified patent and that saw Letters Patent are hereby corrected as shown below.  
 Column 8, line 60, the word &#34;and&#34; should read --said--.  
 Column 9, line 11, the Word &#34;f0&#34; should read --of--.  
 Signed and Sealed this twenty-second D3) of July 1975 [SEAL] Allesl:  
 RUTH C. MASON C. MARSHALL DANN Arlvslmg Officer Commissioner of Parents and Trademarks