US3870088A - Apparatus for withdrawing and storing filling yarn in stationary filling supply weaving machines - Google Patents

Apparatus for withdrawing and storing filling yarn in stationary filling supply weaving machines Download PDF

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Publication number
US3870088A
US3870088A US363138A US36313873A US3870088A US 3870088 A US3870088 A US 3870088A US 363138 A US363138 A US 363138A US 36313873 A US36313873 A US 36313873A US 3870088 A US3870088 A US 3870088A
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Prior art keywords
filling yarn
filling
cylinder
drum
yarn
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Expired - Lifetime
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US363138A
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English (en)
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Walter Scheffel
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Individual
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Individual
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Publication date
Priority claimed from DE2224933A external-priority patent/DE2224933A1/de
Priority claimed from DE2249393A external-priority patent/DE2249393A1/de
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms

Definitions

  • ABSTRACT A system whereby a low and uniform withdrawal velocity is obtained at the filling yarn supply unit and a low and uniform withdrawal resistance exists in the filling yarn storage.
  • a cylinder is provided with partitions extending helic ally around drum means. The cylinder has a perimeter matching the length of filling yarn to be stored around the drum means.
  • the filling supply is storable and releasable under influence of a fluid relative to chambers formed by the partitions.
  • This invention relatesto apparatus for withdrawing and storing the filling yarn in machines for making weblike fabrics, such as weaving machines having the filling yarn supply unit outside the shed of warp threads, etc., said apparatus being arranged in the path of the filling yarn-between the filling yarn supply unit and the weaving machine and incorporating at least one mechanicaldrive drum to withdraw the filling yarn from the filling yarn supply unit around which drum the filling yarn is storable and releasable under the effect of a fluid.
  • mechanical conveying means are predominantly used having grippers or carriers for the filling yarn and, depending on the method of propulsion, convey the filling yarn across the full width of the woven material or web-like fabric to be made or over a certain distance after which the filling yarn is picked up by another gripper or carrier to complete the pick.
  • the conveying means pick up and insert the filling yarn in the shed of warp threads carefully, the instantaneous pulling moment is liable to cause considerable tension stresses in the filling yarn which, if the filling yarn supply unit fails to yield sufficiently, in particular if the filling yarn is stuck or otherwise fails to unwind, results in the filling yarn breaking.
  • the present invention has for its object to provide a system whereby a low and uniform withdrawal velocity is obtained at the filling yarn supply unit and a low and uniform withdrawal resistance in the filling yarn storage.
  • this invention is intended to solve the problem of withdrawing and storing the filling yarn without ballooning taking place.
  • This object according to the invention is achieved in a system of the type referred to initially by having a cylinder with a perimeter matching the length of filling yarn to be stored disposed around a drum or drums, the cylinder being provided with partitions extending helically around the drum or drums and the shell of the cylinder being formed with surfaces for the stored filling yarn and ports allowing fluid to escape from the chambers formed in the cylinder by the partitions.
  • S is the thread tension existing at the outlet side in the storage device at the point where the filling yarn just lifts off the rotating drum.
  • S is the thread tension existing at the inlet of the storage device at the point where the filling yarn winds tangentially onto the drum.
  • e is the basis of the natural logarithms and u is the friction coefficient for the friction between the filling yarn and the drum. The are measure for the thread length lying on the drum is given by a.
  • the tension S is greater than the withdrawal resistance at the filling yarn supply unit, then the filling yarn is withdrawn from the filling yarn supply and conveyed into the storage device or system.
  • the increase in the amount of thread contained in the storage device causes an increased length of thread to be lifted off under the effect of the fluid and taken towards the envelope of the chamber. Simultaneously, the are a shortens, causing the tension S to be reduced until the filling yarn at the inlet of the storage device soon becomes stationary again.
  • the storage action resides in the fact that the length of filling yarn entering causes the diameter of the'thread coils already contained in the storage device to increase.
  • filling yarn will come out of the storage device, whereby the diameter of the outlet-side thread coils in the storage device will decrease, resulting in a longer thread length contacting the drum than before.
  • the increase in the are a of contact between the thread and the rotating drum or drums produces a higher thread tension 5,.
  • This initiates the cycle of conveying and storing already described so that the initial state is soon restored.
  • the filling yarn in the system according to the invention is not withdrawn against the moment of the filling yarn supply unit but withdrawn from the storage practically without the resistance of an opposing force.
  • the chambers provided around the drum or drums may be disposed helically adjacent to each other.
  • each partition is formed with at least one radial slot for the threading of the filling yarn.
  • the fluid which, as a rule, will be a gaseous medium
  • a plurality of fluid supply pipes may be disposed between the drums with their radial outlet ports directed towards the inner surface of the cylinder.
  • FIG. 1 shows a cylinder with two drums arranged inside it for a filling yarn to be stored having chambers arranged helically around the drums inside the cylinder,
  • FIG. 2 is a cross section through FIG. I including a section through one drum.
  • FIG. 3 is a plan view of the system illustrated in FIG.
  • FIG. 4 shows a system having only one drum arranged inside the cylinder and chambers disposed in parallel around this drum for the filling yarn
  • FIG. 5 is a cross section through the system illustrated in FIG. 4,
  • FIG. 6 is a plan view of the system illustrated in FIG. 4, and
  • FIG. 7 shows a weaving machine with a storage sys tem and filling yarn supply unit arranged at its side.
  • the system according to the invention is explained and described as applied to the example of a weaving machine it being arranged between a shed of threads 23, a weaving machine 24 and a filling yarn supply unit 25.
  • the weaving machine is provided with insertion means 28 for inserting a filling yarn 26 through the shed of a plurality of warp threads 27.
  • the insertion means 28, which, for example, may be of the mechanical type are shown in the form of tapes arranged on drivable pulleys 29.
  • Each tape end of the insertion means in the embodiment shown here is provided with a gripper or carrier 30 and 31 for the end of the filling yarn 26, one of the carriers, say 30, being so designed as to not only pick up the end of the filling yarn, but also to transfer it to the other carrier 31.
  • Cutting means 34 for instance, scissors or similar systems, are provided on the weaving machine 24 to cut the filling yarn 26 to length after insertion through the warp threads 27 or a picking at the entry side of the filling yarn into the shed 23. Furthermore, a thread clamp 32 is provided there serving to keep the cutt off filling yarn ready for the insertion of the next pick.
  • FIGS. 1, 2 and 3 The embodiment of the invention illustrated in FIGS. 1, 2 and 3 is characterized by two rotating drums l and 2 and, arranged helically around these, stationary partitions 3 of a cylinder 33 containing all these elements.
  • the strand 4 of the filling yarn 26 coming from the filling yarn supply unit 25 enters the system at the inlet edge 5.
  • the filling yarn 26, the strand of which inside the cylinder 33 is designated by 6, runs helically around the drums l and 2.
  • the strand 7 of the filling 26 running to the weaving machine 24 leaves the storage system at the outlet edge 8. It is implied that the strand 4 as well as the strand 7 can also enter and leave the individual chambers 13 through openings in the envelope surface 14 of the cylinder 33.
  • the two drums 1 and 2 rotate in the same sense and are operated by a drive 9.
  • the surface velocity of the individual drums is equal and at least as high as the velocity of the yarn occurring in the strand 7.
  • a fluid in this case air at above atmospheric pressure, is admitted through an inlet 11 into the drums'to'flow through passages 12 formed as radial holes in the drums into the chambers 13.
  • the air is discharged to atmosphere through the passages 15.
  • the shell of the cylinder 33, Le. its envelope 14, is detachable in order that the filling yarn 26 can be inserted into the storage system before starting operation.
  • the partitions 3 of the chambers 13 surround the drums 1, 2 with a relatively small clearance, a free gap 16 being left free between the partitions and the drums.
  • the filling yarn 26 is pulled into the cylinder by rotating drums l, 2 on the one hand and the admission of the fluid, the filling yarn gradually running onto the inner perimeter of the cylinder.
  • each coil of the filling yarn 26 lies in a separate chamber 13 so that there is no possibility of the filling yarn tangling inside the cylinder 33.
  • the storage system has been simplified somewhat inasmuch as there is only a single drum 1 instead of two drums l, 2.
  • This embodiment also has the partitions 17, 18 and 19 of the chambers 13a and 13b straight around the drum 1 instead of helically.
  • the strand 4 enters through a radial slot 20 provided in the first partition 17 into the chamber 13a.
  • the filling yarn 6 wraps around the drum 1 once and then passes through another slot 21 into the next chamber 13b.
  • the outlet-side strand 7 leaves the chamber 13b through another slot 22 to run on to the weaving machine 24.
  • the inlet and outlet of the strands 4 and 7 may be through openings in the shell of the cylinder 33.
  • a pressurized fluid such as air in this case, is admitted through an inlet 11 in the bearing system of the drum 1 to the passages 12 in the drum to flow through these radial passages into the chambers 13a and 13b which it again leaves through the ports 15 in the shell or envelope 14 of the cylinder 33.
  • the coils formed by the filling yarn 6 around the drum 1 increase in diameter under the influence of the radial flow of the fluid to lie against the inner surface ofthe shell 14.
  • the surface velocity of the drum is constant and at least as high as the maximum velocity of the strand 7 occurring.
  • the supply of a fluid is represented as being through the individual drums 1 and 2 formed with radial ports 12.
  • the supply pipes are arranged outside the drums, as exemplified by the dashdot line in FIG. 1.
  • the fluid supply pipes are disposed in parallel to the rotating axes of the drums, but they are outside the drums and have their radial ports directed towards the inner surface of the cylinder.
  • the use of such fluid supply pipes can be an advantage especially where radial ports in the drums 1, 2 are to be avoided, or where sealing is a special problem in taking the fluid supply through the drums.
  • the helical coils of yarn are separated by partitions. This means that a new partition follows after every 360 arc of the yarn winding.
  • Two typical alternatives are described and represented in the embodiments referred to above, namely a parallel arrangement and a helical arrangement of the individual partitions.
  • the parallel partitions are disposed perpendicularly to the axis of the rotating drum and are formed each with a slot shaped radial penetra: tion serving to transfer the filling yarn into the next chamber. If the partition or separating surface is formed as a helical surface, these penetrations are not needed because the partition will then follow the helical yarn coil at a uniform spacing.
  • each partition and the next there is an outer envelope, i.e., the shell of the cylinder which connects the outer perimeter of the chamber.
  • This envelope is permeable and permits the fluid to-escape outwards, while controlling the size of the yarn coils as the filling yarn is laid onto the inside of this envelope.
  • this envelope forms the chambers referred to earlier of which each accommodates one coil of yarn.
  • the number of chambers can be chosen at will. It is thus possible to have a group of adjacent chambers handle one yarn and the subsequent chambers another yarn. This results in a storage system according to the invention for multicolour weaving machines. Compared to the storage system according to the invention for storing and conveying one yarn, the multiple version is bigger, but not more complex.
  • Apparatus for weaving machines having a warp shed including means to define a path'and a system for withdrawing and storing of filling yarn in machines for making web-like fabrics with a filling yarn supply being outside the warp shed, said withdrawing and storing system being located in the path of the filling yarn between the filling yarn supply and the weaving machine and incorporating at least one mechanically-driven drum means for withdrawing the filling yarn from the filling yarn supply, the filling yarn being controlled about said drum to be alternately stored and released under the influence of fluid, means including portions having edges arranged to form chambers collectively around the drum means and a cylinder having a shell defining a perimeter matching the length of the filling yarn to be stored around said drum means, siad shell having surfaces to deposit the stored filling yarn and having openings for the discharge of fluid from the chambers formed by the partitions of the cylinder.
  • each partition has at least one radial cut-out for the threading of the filling yarn.
  • Apparatus as in claim 1 characterized in that said cylinder has openings in its shell for the entry and exit of the filling yarn.
  • Apparatus as in claim 1 further characterized in that the cylinder has radial cut-outs in its outermost partitions of which one is formed as an inlet edge and the other as an outlet edge for the entry and exit of the filling yarn.
  • Apparatus as in claim 8 further characterized in that said fluid supply pipe passes through said drum means when only one drum means is used.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US363138A 1972-05-23 1973-05-23 Apparatus for withdrawing and storing filling yarn in stationary filling supply weaving machines Expired - Lifetime US3870088A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2224933A DE2224933A1 (de) 1972-05-23 1972-05-23 Vorrichtung zum abziehen und speichern des schussfadens bei webmaschinen mit schussvorratsspule ausserhalb des webfaches
DE2249393A DE2249393A1 (de) 1972-10-09 1972-10-09 Vorrichtung zum abziehen und speichern des schussfadens bei webmaschinen mit schussvorratsspule ausserhalb des webfaches

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US3870088A true US3870088A (en) 1975-03-11

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US (1) US3870088A (enExample)
CH (1) CH562342A5 (enExample)
FR (1) FR2185704B3 (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033384A (en) * 1974-08-26 1977-07-05 Crompton & Knowles Corporation Means for and method of supplying weft yarn to an outside filling supply loom
US4108216A (en) * 1974-11-11 1978-08-22 Wueger Karl W Yarn dispensing apparatus for a loom and the method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303857A (en) * 1963-08-09 1967-02-14 Scheffel Walter Loom with pneumatic picking means
US3353732A (en) * 1965-07-02 1967-11-21 Sperry Rand Corp Bulk storage tape feed
US3477476A (en) * 1968-02-26 1969-11-11 Leesona Corp Storage device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303857A (en) * 1963-08-09 1967-02-14 Scheffel Walter Loom with pneumatic picking means
US3353732A (en) * 1965-07-02 1967-11-21 Sperry Rand Corp Bulk storage tape feed
US3477476A (en) * 1968-02-26 1969-11-11 Leesona Corp Storage device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033384A (en) * 1974-08-26 1977-07-05 Crompton & Knowles Corporation Means for and method of supplying weft yarn to an outside filling supply loom
US4108216A (en) * 1974-11-11 1978-08-22 Wueger Karl W Yarn dispensing apparatus for a loom and the method thereof

Also Published As

Publication number Publication date
FR2185704B3 (enExample) 1976-05-14
FR2185704A1 (enExample) 1974-01-04
CH562342A5 (enExample) 1975-05-30

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