US3425457A - Let-off for terry - Google Patents
Let-off for terry Download PDFInfo
- Publication number
- US3425457A US3425457A US635145A US3425457DA US3425457A US 3425457 A US3425457 A US 3425457A US 635145 A US635145 A US 635145A US 3425457D A US3425457D A US 3425457DA US 3425457 A US3425457 A US 3425457A
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- United States
- Prior art keywords
- terry
- pawl
- shaft
- warp
- drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D27/00—Woven pile fabrics
- D03D27/02—Woven pile fabrics wherein the pile is formed by warp or weft
- D03D27/06—Warp pile fabrics
- D03D27/08—Terry fabrics
Definitions
- the present invention relates to warp let-ofl and particularly for warps which have to be drawn off intermittently due to periodic usage such as warps for making terry loops in a terry towel loom.
- Looms of this type operate on a multiple pick sequence as for example, three pick terry in which the lay makes two partial beat-ups while the reed is swung back relative to the lay at a slight angle from normal and then one full beat-up while the reed is in normal position.
- the terry loops are formed and require an excess of terry warp at this time. For this reason the exact amount of terry warp has to be drawn off from a separate beam from that of the ground warp.
- the terry warp is usually drawn around a feed roll which is driven at the appropriate time through a pawl and ratchet wheel arrangement and an idler roll which is driven frictionally by the feed roll or through gearing.
- a brake is usually provided on the feed roll to prevent the ratchet wheel and feed roll from turning when the drive pawl moves through a return stroke.
- the ratchet wheel and feed roll have a tendency to rotate in the direction of feeding due to the constant tension created by the cloth take-up. This feature is very critical, for if the feed roll is not prevented from rotating while the pawl makes its return stroke, additional terry warp yarn may be drawn off.
- the present invention solves the above problem by providing a positive holding means for the roll such as a second ratchet wheel having teeth which are oriented in the opposite direction from the teeth of the drive ratchet and a hold pawl which can engage the second ratchet ice wheel to prevent the feed roll from turning.
- Means are provided to lift the hold pawl out of engagement with its respective ratchet wheel when the drive pawl moves through its driving stroke.
- Means are also provided to disconnect both pawls when a plain section of cloth is woven as for example, the border of a towel.
- FIGURE 1 is a side elevation of a terry loom with the invention applied thereto;
- FIGURE 2 is a fragmentary elevation on an enlarged scale of a portion of the warp feed device shown in FIGURE 1;
- FIGURE 3 is a plan view of the warp feed device shown in FIGURE 2.
- FIGURE 4 is a fragmentary view looking in the direction of arrow 4, FIGURE 1.
- the loom framework has loomsides 1 and 2, a lay L mounted to rock about a rocker shaft 3 by means of connectors, one of which is shown at 4.
- the connectors are reciprocated by a crankshaft or top shaft 5 which is connected by gearing 6, indicated diagrammatically, to a bottom shaft 7.
- the crankshaft 5 turns twice as fast as the bottom shaft, and turns in a counterclockwise direction as viewed in FIGURE 1.
- the loom is also equipped with a beam 8 containing terry warp W, a beam 9 containing ground warp W and a pattern mechanism which in this case is a dobby designated by the reference character D, but it is to be understood that other pattern means can be used.
- the let-off mechanism for the terry warp is indicated by the reference character 11 and includes a feed roll 13 and an idler roll 15 fixed to shafts 14 and 14' respectively which are supported by loomsides 1 and 2. Idler roll 15 can be driven by feed roll 13 through frictional engagement or by equal gearing, not shown.
- a pair of ratchet wheels 10 and 12 are fixed to a portion of shaft '14 which extends outside of the loom side 1.
- a bell-crank lever generally indicated at 16 ' has a pair of arms 19 and 28 and is freely mounted on shaft .14.
- a drive pawl 17 is pivotally attached to arm 19 by a pin 18 in driving relationship with the teeth of ratchet 10.
- a hold pawl 20 is attached to a lever 21 keyed about a stub shaft 23 which is supported by a bearing member 23. Hold pawl 20 is normally engaged with the teeth of ratchet 12 in holding relation.
- a second bell-crank lever generally indicated at 22 is pivoted on a stub shaft 24 and 'has a pair of arms 26 and 45. Arm 26 is connected to arm 28 of bell-crank lever 16 by an elongated rod 30.
- a cam 32 is fixed to a stub shaft 34 which is driven by a gear 36 which is in turn driven by a gear 38 fixed to bottom shaft 7. Gear 38 makes three rotations for every two rotations of gear 36. Since bottom shaft 7 makes one rotation for every two reciprocations of lay L, cam 32 makes one rotation for every three reciprocations of lay L or once for every three weft insertions.
- Cam 32 has a high portion 42 and a low portion 44. Attached to arm 45 of bell-crank lever 22 is a cam follower 46 which rides along the surface of cam 32 as it rotates in a counterclockwise direction as seen in FIG- URE 1.
- Follower 46 is held in contact with cam 32 by a tension spring 47.
- bell-crank lever 22 is rotated counterclockwise and causes bell-crank lever 16 to rotate clockwise. This motion causes the drive pawl 17 to rock back along drive sprocket to engage a different tooth.
- a link 54 is attached at one end to the upper portion of arm 19 and is slidingly connected at its other end to arm 48 which is keyed to stub shaft 23.
- a projection 50 on arm 48 fits into a slot 52 in link 54 so that when lever 16 is rocked clockwise to rock the drive pawl to the right (as viewed in FIGURE 2) in preparation for a drive stroke, projection 50 rides in slot 52 until it reaches the end. This will occur as drive pawl 17 falls into engagement with the next tooth to be engaged and a slight additional motion of lever '16 will cause link 54 to rock stub shaft 23. When this happens, lever 21 will be rocked counterclockwise, thereby pulling hold pawl 20 out of engagement with ratchet wheel '12 against the action of a spring 53.
- the mechanism for operating the drive pawl 17 is of known construction and operates in known manner with the exception of the timing of the stroke of pawl 17 as controlled by cam 32.
- the usual timing is such that the drive pawl is given a driving stroke which is immediately followed by a return stroke and then made to dwell until the next driving stroke.
- the drive pawl begins with a return stroke which is immediately followed by a driving stroke and then dwells until the next return stroke.
- drive pawl 17 and hold pawl 20 are both in tooth engaging positions so that feed roll is locked in both directions. This timing is also necessary because it is during the return motion of drive pawl 17 that hold pawl 20 is lifted out of engagement with ratchet 12.
- pawl 17 drives feed roll for a short distance once every three picks and at a time in the terry cycle when terry yarn is needed to form pile loops.
- warp W is drawn from terry warp beam 8 around a slack take-up roll 59, to the left around feed roll 13, then between feed roll 13 and idler roll 15. It is then drawn around idler roll 15 and down around a roll 58 where it joins the ground warp W. From roll 58, warps W and W are drawn into a shed and incorporated into the cloth to be woven.
- drive pawl 17 is pivoted on the upper end of arm 19, it is held in engagement with a tooth on ratchet wheel 10 by a compression spring 60. Pawl 17 is attached to arm 19 in this way for a purpose to be described.
- terry warp has to be drawn through continuously with the ground warp.
- the pattern of the towel and length are controlled by pattern mechanism or dobby D, see FIGURE 1.
- a stub shaft 61 which is pivoted by one of the dobby jacks and controls the swing reed which is responsible for forming the terry loops, for instance, in a manner similar to that of stud 121 shown in US. Patent 2,799,297.
- Attached to shaft 61 is a rod 62 and a spring 64 which are connected to pawls 20 and 17 respectively.
- shaft 61 is partially pivoted to operate the swing reed, not shown, and at the same time to disconnect the pawls 17 and 20 from ratchet wheels 10 and 12 respectively.
- Pawl 20 is pulled directly upward around shaft 23 and pawl 17 is pulled up around pin 18 against the action of spring 60.
- a let-off mechanism for controlling the amount of terry warp being letoif from a supply source comprising:
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Description
C. P. BERGSTROM LET-OFF FOR TERRY Feb. 4; 1969 Filed May 1, 1967 ll hl Sheet L of 2 INVENTOR CARL P. BERGSTROM v ATTORNEY Feb. 4, 1969 c BERGSTROM 3,425,457
LET-OFF FOR TERRY Sheet Q of 2 Filed May 1, 1967 INVENTOR CARL P. BERGSTROM BYMMM ATTORNEY United States Patent 3,425,457 LET-OFF FOR TERRY Carl P. Bcrgstrom, Millbury, Mass., assignor to Crompton & Knowles Corporation, Worcester, Mass., a corporation of Massachusetts Filed May 1, 1967, Ser. No. 635,145
US. Cl. 139--25 Int. Cl. D03d 39/22, 41/00; D03c 49/06 6 Claims ABSTRACT OF THE DISCLOSURE The present invention relates to warp let-ofl and particularly for warps which have to be drawn off intermittently due to periodic usage such as warps for making terry loops in a terry towel loom.
Looms of this type operate on a multiple pick sequence as for example, three pick terry in which the lay makes two partial beat-ups while the reed is swung back relative to the lay at a slight angle from normal and then one full beat-up while the reed is in normal position. During the full beat-up, the terry loops are formed and require an excess of terry warp at this time. For this reason the exact amount of terry warp has to be drawn off from a separate beam from that of the ground warp.
The terry warp is usually drawn around a feed roll which is driven at the appropriate time through a pawl and ratchet wheel arrangement and an idler roll which is driven frictionally by the feed roll or through gearing. A brake is usually provided on the feed roll to prevent the ratchet wheel and feed roll from turning when the drive pawl moves through a return stroke. The ratchet wheel and feed roll have a tendency to rotate in the direction of feeding due to the constant tension created by the cloth take-up. This feature is very critical, for if the feed roll is not prevented from rotating while the pawl makes its return stroke, additional terry warp yarn may be drawn off. This additional amount, together with the usual amount drawn off by the action of the drive pawl will be more than the desired amount of terry warp. If the amount of terry warp being drawn off is not controlled there will be variations in the length of terry loops to produce a non-uniform terry fabric.
The use of a brake has never been completely satisfactory. It has to be strong enough to hold the feed roll against rotation in opposition to the tension created in the cloth take-up mechanism and yet be weak enough to allow the drive pawl to rotate the ratchet wheel and feed roll forward. This requires that the brake has to be accurately set for various conditions and has to be frequently adjusted during weaving. The problem becomes even more acute with unusually wide terry looms.
The present invention solves the above problem by providing a positive holding means for the roll such as a second ratchet wheel having teeth which are oriented in the opposite direction from the teeth of the drive ratchet and a hold pawl which can engage the second ratchet ice wheel to prevent the feed roll from turning. Means are provided to lift the hold pawl out of engagement with its respective ratchet wheel when the drive pawl moves through its driving stroke. Means are also provided to disconnect both pawls when a plain section of cloth is woven as for example, the border of a towel.
It is therefore an object of the present invention to provide a positive feeding and holding mechanism for intermittently releasing terry warp yarn and preventing any further release of terry yarn between periods of positive feeding.
It is a further object of the invention to provide means for disengaging the positive feeding and holding mechanism to weave plain fabric.
Other objects and the details of that which is believed to be novel will be clear from the following descriptions and claims taken with the accompanying drawings in which:
FIGURE 1 is a side elevation of a terry loom with the invention applied thereto;
FIGURE 2 is a fragmentary elevation on an enlarged scale of a portion of the warp feed device shown in FIGURE 1;
FIGURE 3 is a plan view of the warp feed device shown in FIGURE 2; and
FIGURE 4 is a fragmentary view looking in the direction of arrow 4, FIGURE 1.
Referring to FIGURE 1, the loom framework has loomsides 1 and 2, a lay L mounted to rock about a rocker shaft 3 by means of connectors, one of which is shown at 4. The connectors are reciprocated by a crankshaft or top shaft 5 which is connected by gearing 6, indicated diagrammatically, to a bottom shaft 7. As shown herein, the crankshaft 5 turns twice as fast as the bottom shaft, and turns in a counterclockwise direction as viewed in FIGURE 1. The loom is also equipped with a beam 8 containing terry warp W, a beam 9 containing ground warp W and a pattern mechanism which in this case is a dobby designated by the reference character D, but it is to be understood that other pattern means can be used.
The let-off mechanism for the terry warp is indicated by the reference character 11 and includes a feed roll 13 and an idler roll 15 fixed to shafts 14 and 14' respectively which are supported by loomsides 1 and 2. Idler roll 15 can be driven by feed roll 13 through frictional engagement or by equal gearing, not shown. A pair of ratchet wheels 10 and 12 are fixed to a portion of shaft '14 which extends outside of the loom side 1. A bell-crank lever generally indicated at 16 'has a pair of arms 19 and 28 and is freely mounted on shaft .14. A drive pawl 17 is pivotally attached to arm 19 by a pin 18 in driving relationship with the teeth of ratchet 10. A hold pawl 20 is attached to a lever 21 keyed about a stub shaft 23 which is supported by a bearing member 23. Hold pawl 20 is normally engaged with the teeth of ratchet 12 in holding relation. A second bell-crank lever generally indicated at 22 is pivoted on a stub shaft 24 and 'has a pair of arms 26 and 45. Arm 26 is connected to arm 28 of bell-crank lever 16 by an elongated rod 30. A cam 32 is fixed to a stub shaft 34 which is driven by a gear 36 which is in turn driven by a gear 38 fixed to bottom shaft 7. Gear 38 makes three rotations for every two rotations of gear 36. Since bottom shaft 7 makes one rotation for every two reciprocations of lay L, cam 32 makes one rotation for every three reciprocations of lay L or once for every three weft insertions.
Cam 32 has a high portion 42 and a low portion 44. Attached to arm 45 of bell-crank lever 22 is a cam follower 46 which rides along the surface of cam 32 as it rotates in a counterclockwise direction as seen in FIG- URE 1. Follower 46 is held in contact with cam 32 by a tension spring 47. As follower 46 goes from the high portion 42 to the low portion 44, bell-crank lever 22 is rotated counterclockwise and causes bell-crank lever 16 to rotate clockwise. This motion causes the drive pawl 17 to rock back along drive sprocket to engage a different tooth. A link 54 is attached at one end to the upper portion of arm 19 and is slidingly connected at its other end to arm 48 which is keyed to stub shaft 23. A projection 50 on arm 48 fits into a slot 52 in link 54 so that when lever 16 is rocked clockwise to rock the drive pawl to the right (as viewed in FIGURE 2) in preparation for a drive stroke, projection 50 rides in slot 52 until it reaches the end. This will occur as drive pawl 17 falls into engagement with the next tooth to be engaged and a slight additional motion of lever '16 will cause link 54 to rock stub shaft 23. When this happens, lever 21 will be rocked counterclockwise, thereby pulling hold pawl 20 out of engagement with ratchet wheel '12 against the action of a spring 53. As soon as the hold pawl is released, the cloth tension will start to pull the drive ratchet ahead (counterclockwise in FIGURE 2), but this will occur at a time in the terry cloth cycle when it is desired to let off terry warp. At this time follower 46 will be moving from the low point 44 back to the high portion 42 of cam 32 to cause lever 16 to rock in a counterclockwise direction against the action of spring 47. When this happens, drive pawl 17 will advance the drive ratchet a distance of one tooth. At the same time, hold pawl 20 is allowed to drop on the tooth previously being held and rides thereon until it encounters the next tooth on ratchet wheel 12. The mechanism for operating the drive pawl 17 is of known construction and operates in known manner with the exception of the timing of the stroke of pawl 17 as controlled by cam 32. The usual timing is such that the drive pawl is given a driving stroke which is immediately followed by a return stroke and then made to dwell until the next driving stroke. In the present invention, the drive pawl begins with a return stroke which is immediately followed by a driving stroke and then dwells until the next return stroke. In this way, drive pawl 17 and hold pawl 20 are both in tooth engaging positions so that feed roll is locked in both directions. This timing is also necessary because it is during the return motion of drive pawl 17 that hold pawl 20 is lifted out of engagement with ratchet 12. As described, the lifting of the hold pawl must occur just prior to feeding of terry yarn. The timing is such that pawl 17 drives feed roll for a short distance once every three picks and at a time in the terry cycle when terry yarn is needed to form pile loops. As viewed in FIGURE 1, when rolls 13 and 15 advance, warp W is drawn from terry warp beam 8 around a slack take-up roll 59, to the left around feed roll 13, then between feed roll 13 and idler roll 15. It is then drawn around idler roll 15 and down around a roll 58 where it joins the ground warp W. From roll 58, warps W and W are drawn into a shed and incorporated into the cloth to be woven.
Although drive pawl 17 is pivoted on the upper end of arm 19, it is held in engagement with a tooth on ratchet wheel 10 by a compression spring 60. Pawl 17 is attached to arm 19 in this way for a purpose to be described.
After the body of a terry towel has been woven it is usually desirable to weave a section of plain cloth where no loops are needed for a border or separation between towel bodies. To do this, the terry warp has to be drawn through continuously with the ground warp. The pattern of the towel and length are controlled by pattern mechanism or dobby D, see FIGURE 1. A stub shaft 61 which is pivoted by one of the dobby jacks and controls the swing reed which is responsible for forming the terry loops, for instance, in a manner similar to that of stud 121 shown in US. Patent 2,799,297.
Attached to shaft 61 is a rod 62 and a spring 64 which are connected to pawls 20 and 17 respectively. When the pattern in the dobby calls for plain cloth to be woven,
Having now particularly described and ascertained the nature of the invention and in what manner the same is to be performed, what is claimed is:
1. In a loom for weaving terry cloth, a let-off mechanism for controlling the amount of terry warp being letoif from a supply source comprising:
(a) a shaft mounted for rotation on said loom;
(b) a feed roll fixed to said shaft, around which said terry warp is trained;
(c) a drive ratchet wheel fixed to said shaft for driving said shaft in one direction;
((1) means to lock said shaft against rotation in said one direction;
(e) a drive pawl arranged in driving relation to said drive ratchet wheel for intermittently driving same in said one direction; and
(f) actuating means operated by the loom to release said locking means while causing said drive pawl to advance said drive ratchet wheel and said feed roll to let-off a predetermined amount of terry warp and to lock said shaft against rotation while moving said driving pawl in a return stroke preparatory to a driving stroke so that said feed roll will be held against further feeding of warp until the next driving stroke of said drive pawl.
2. The let-off mechanism as described in claim 1 wherein said locking means comprises:
(a) a holding ratchet wheel fixed to said shaft and having teeth which are oriented in the opposite directions from the teeth on said drive ratchet wheel; and
(b) a hold pawl arranged in holding relation with respect to said holding ratchet wheel.
3. The let-off mechanism as described in claim 2 wherein said hold pawl is pivoted on a stationary part of the loom and wherein said actuating means comprises:
(a) a constantly rotating shaft on said loom;
(b) a cam fixed to said shaft;
(c) a cam follower which is moved by said cam;
(d) a pivoted lever operatively connected to said cam follower and pivotally supporting said drive pawl for oscillating same in alternate driving and reciprocating strokes; and
(e) a link attached at one end to said lever and operatively connected at its other end to said hold pawl for lifting said hold pawl out of engagement with said holding ratchet wheel prior to a driving stroke of said drive pawl.
4. The let-off mechanism as described in claim 3 wherein said constantly rotating shaft is an auxiliary shaft mounted in stationary bearings and which makes one revolution for every three weft insertions.
5. The let-off mechanism as described in claim 2 wherein said loom has a pattern mechanism and auxiliary means operatively connected to said pattern mechanism and said pawls to lift both of said pawls out of engagement with their respective wheels so that terry warp can be drawn freely when a pattern calls for the loom to weave plain cloth without terry loops.
6. The let-off mechanism as described in claim 1 wherein said locking means comprises:
(a) an extension of said drive ratchet wheel on which there is a set of circumferential teeth which are oriented in the opposite direction from the teeth of said drive ratchet; and
(b) a hold pawl arranged in holding relation with respect to the teeth on said extension.
(References on following page) 5 6 References Cited FOREIGN PATENTS UNITED STATES PATENTS 202,718 8/ 1923 Great Britain. 547,864 9/ 1942 Great Britain. 785,595 3/1905 Crowley 13925 1,249,899 12/ 1917 Carpenter 13925 5 JAMES KEE CHI, Primary Examiner. 1,949,579 3/1934 Parker 13925 US Cl XR 2,250,833 7/1941 Hill 13925
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US63514567A | 1967-05-01 | 1967-05-01 |
Publications (1)
Publication Number | Publication Date |
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US3425457A true US3425457A (en) | 1969-02-04 |
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ID=24546627
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Application Number | Title | Priority Date | Filing Date |
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US635145A Expired - Lifetime US3425457A (en) | 1967-05-01 | 1967-05-01 | Let-off for terry |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3746052A (en) * | 1971-07-16 | 1973-07-17 | Cannon Mills Co | Method and apparatus for feeding terry warps in looms |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US785595A (en) * | 1904-01-20 | 1905-03-21 | John H Crowley | Terry-loom. |
US1249899A (en) * | 1916-12-26 | 1917-12-11 | James Franklin Carpenter | Let-off motion. |
GB202718A (en) * | 1922-05-23 | 1923-08-23 | John Tattersall | A new or improved positive let off motion for the pile warps in terry looms |
US1949579A (en) * | 1931-12-09 | 1934-03-06 | Parker Samuel Pinkney | Weaving terry fabrics |
US2250833A (en) * | 1939-12-18 | 1941-07-29 | Albert H Hill | Letoff mechanism for looms |
GB547864A (en) * | 1941-07-08 | 1942-09-15 | Calico Printers Ass Ltd | Improvements relating to looms for weaving |
-
1967
- 1967-05-01 US US635145A patent/US3425457A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US785595A (en) * | 1904-01-20 | 1905-03-21 | John H Crowley | Terry-loom. |
US1249899A (en) * | 1916-12-26 | 1917-12-11 | James Franklin Carpenter | Let-off motion. |
GB202718A (en) * | 1922-05-23 | 1923-08-23 | John Tattersall | A new or improved positive let off motion for the pile warps in terry looms |
US1949579A (en) * | 1931-12-09 | 1934-03-06 | Parker Samuel Pinkney | Weaving terry fabrics |
US2250833A (en) * | 1939-12-18 | 1941-07-29 | Albert H Hill | Letoff mechanism for looms |
GB547864A (en) * | 1941-07-08 | 1942-09-15 | Calico Printers Ass Ltd | Improvements relating to looms for weaving |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3746052A (en) * | 1971-07-16 | 1973-07-17 | Cannon Mills Co | Method and apparatus for feeding terry warps in looms |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: LEESONA CORPORATION, A CORP. OF, RHODE ISLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CROMPTON & KNOWLES CORPORATION;REEL/FRAME:004045/0129 Effective date: 19820324 Owner name: LEESONA CORPORATION, 333 STRAWBERRY FIELD RD. WARW Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CROMPTON & KNOWLES CORPORATION;REEL/FRAME:004045/0129 Effective date: 19820324 |