[go: up one dir, main page]

US3615991A - Method for uniting thread ends - Google Patents

Method for uniting thread ends Download PDF

Info

Publication number
US3615991A
US3615991A US800049A US3615991DA US3615991A US 3615991 A US3615991 A US 3615991A US 800049 A US800049 A US 800049A US 3615991D A US3615991D A US 3615991DA US 3615991 A US3615991 A US 3615991A
Authority
US
United States
Prior art keywords
threads
twisted
length
thread
clamping
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.)
Expired - Lifetime
Application number
US800049A
Other languages
English (en)
Inventor
Richard Munzner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Glanzstoff AG
Original Assignee
Glanzstoff AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Glanzstoff AG filed Critical Glanzstoff AG
Application granted granted Critical
Publication of US3615991A publication Critical patent/US3615991A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/69—General aspects of joining filaments 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H69/00—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device
    • B65H69/08—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8324—Joining or pressing tools pivoting around one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • Shurtleff ABSTRACT Method of uniting the ends of thermoplastic threads or yarns by twisting the ends over a short length with the twisted length being clamped and held under tension and applying heat to a relatively small area of the twisted length so as to melt and bond the threads together as they are simultaneously caused to untwist under the release of tension.
  • the method essentially includes two clamping means adapted to receive and hold the twisted length of threads, and a heating element preferably positioned immediately adjacent one of the clamping means and adapted to melt and bond the ends of the thread.
  • This invention generally relates to a method and an apparatus for uniting or melt-bonding the ends of yarns or threads composed of a thennoplastic filamentary material.
  • a textile product i.e. fabric or the like
  • This connection of one yarn end to another must be strong enough to withstand the stresses or tension which occurs during any further processing of the continuous thread or yarn.
  • the connection of the yarn ends must also be easily and quickly produced and should not have any deleterious effect, either during the processing or in the finished textile pattern.
  • This known apparatus essentially includes a device for moistening the threads, an electrically heated clamping device in which the threads are welded or bonded together, and a severing device in order to cut off the ends which have become free after the welding operation is concluded.
  • the two thread ends to be welded are first of all wetted by hand in the moistening arrangement and thereafter are pressed between the clamping jaws and welded. While the welded thread is held in the clamping device, the ends of the thread are cut of? by means of the cutter or severing device, whereupon the welded or bonded thread can then be extracted from the clamping device.
  • this known apparatus and procedure has the disadvantage that the quality of the bonded union depends to a high degree on the period of time during which the threads to be united are held in the clamping device. Individual connections in different lengths of thread consequently show great differences in quality and appearance. Furthermore, experience has shown that the severing device cannot completely eliminate projecting thread ends which then remain and have a deleterious effect during the further processing of the thread into textile fabrics and in the finished pattern of these fabrics. This same objection arises where the thread ends are simply knotted or spliced.
  • One object of the present invention is to provide a method and apparatus for the rapid and efiective welding or meltbonding of thread ends which avoids prior difficulties and yet can be carried out in a relatively simple manner.
  • Another object of the invention is to melt-bond thread ends with a minimum of waste material and a substantially complete absence of projecting or free ends at the point of union.
  • the ends of individual yarns or threads can be effectively united to one another by the steps which comprise: placing the ends of the threads to be united together in parallel relationship with the ends extending in the same direction; twisting the threads over a short length adjacent the ends thereof with an amount or degree of twist sufficient to cause the threads to untwist under the release of longitudinal tension; clamping the twisted short length of threads at either end thereof under longitudinal tension; and applying heat to a selected intermediate area or portion of the twisted length sufficient to temporarily melt the individual threads and simultaneously cause them to untwist under the resulting release of tension.
  • the melt-bonding of the thread ends is accomplished as the twisted threads rotate and unwind under the torsional stress imparted by the original twisting of the juxtaposed threads and held in place by clamping the short twisted length. Since heat is most easily applied only to one side of the twisted threads, preferably in direct contact with a suitable heating element, the melt-bonding operation actually has the effect of melting through the twisted threads so as to release the longitudinal tension thereon and cause them to untwist under the influence of the torsional stress. Since the individual threads are in contact during this rotation, they become welded together as soon as they resolidify at a short distance from the heating element.
  • the clamped length of the twisted threads, the amount of twist and the specific area over which heat is applied will naturally vary to some extent depending upon the size or denier of the individual thread or yarn ends being united, the number of individual filaments in the thread or yarn and similar factors.
  • the method of the invention is generally applicable to a wide range of thermoplastic threads or yarns especially those composed of continuous monofilaments or multifilaments but also staple fiber threads and yarns and even composite yarns.
  • the intermediate area or portion of the twisted length at which heat is applied should normally be maintained within limits of about 0.5 to 4 mm. and preferably about 2 mm. or less. Heating of an overly extended portion of the twisted length should be avoided and the minimum length to which heat is applied will depend for the most part on the size and construction of the heating element. Although this heating element may be in direct contact with the twisted length of threads, it should not in itself cause a clamping or restriction on the threads which would interfere with their unwinding or untwisting at the point of heat application.
  • the heating zone or area of heat application is preferably about 1 cm. or less from this remote clamping position.
  • the ends are bonded together when a relatively short length of the two severed portions, each containing the two threads. drop downwardly and thus move completely away from the heat supply so as to rapidly solidify.
  • the bonding occurs only a very short distance along the united threads. This does not cause any significant projection of these melted and reunited thread ends outside of the normal linear path of the threads although it may impart a slightly crimped appearance at the point of union which can hardly be observed, if at all, in subsequent operations or in completed fabric products.
  • Such apparatus includes a pair of clamping means spaced from each other and adapted to receive and hold a length of twisted threads under tension, each clamping means comprising two jaw members of which at least one is pivotally mounted and resiliently urged toward the other to tightly hold the twisted strand of threads therebetween.
  • the apparatus further includes an electrical resistance heating element arranged or positioned immediately adjacent one of the clamping means at a point in close proximity thereto at which it will heat and melt a short length, e.g. up to about 4 mm. and preferably 0.5 to 2 mm., of the twisted threads when held under tension between the two clamping means.
  • the heating element is preferably adjustably mounted so that it can be moved toward and into direct contact with the length of twisted threads, thereby permitting a rapid local heating and melt-bonding of the twisted threads.
  • FIG. 1 is a side elevational view of the apparatus with an enclosure or housing shown in broken lines and certain elements being schematically represented;
  • HO. 2 is a top plan view of the same apparatus with the housing omitted;
  • FIG. 3 is an enlarged partial side elevational view of one clamping means illustrating a thread groove therein which holds the twisted threads.
  • a base plate or supporting frame 1 carries two identical clamping devices 2, each of which is made up of the jaw members 3 and 4.
  • Both jaws are constructed of a plurality of sheet metal plates 3a, 3b, 3c and 4a, 4b, respectively, separated by similar base shims 5 and 6.
  • the jaw 3 has three plates and the jaw 4 has two plates which are interconnected with their base shims 5 and 6, respectively, by means of suitable rivets or bolts 7.
  • the upper portion of these plates are likewise preferably separated and interconnected by the top shims 8 and 9 and the rivets 10 (as shown by dotted lines and rivet positions in FIG. 1 but intentionally omitted in FIG. 2).
  • the plates of the jaw 4 project into the slots formed by the shims 5 of jaw 3, and conversely, the intermediate plate 3b of jaw 3 projects into the slot formed by shim 6 of jaw 4.
  • the jaws 4 are provided with an extended arm 1! which carries a downwardly projecting stud 12 which together with the stud 13 on the base plate 1 holds in place a helical spring 14.
  • the resilient clamping force of the jaws or clamping means is furnished by this helical spring 14.
  • the jaw members 3 are tightly screwed or bolted to the base frame 1, e.g. by means of bolts 15.
  • the jaw members 4 are pivotally mounted to the base frame 1 by means of a pin 16, so that the jaw will rotate or reciprocate in the direction indicated by the double-headed arrow.
  • the helical spring 14 then urges jaw 4 into a closed clamping position against jaw 3 as indicated in all of the figures of the drawing.
  • the jaws not only permits a secure clamping of a length of twisted threads T therebetween but also provides a rapid and simple means of inserting two parallel and twisted threads or yarns into the device so as to be immediately clamped under tension.
  • the jaw members 3 and 4 are so constructed as to present oppositely disposed thread contacting surfaces or facing edges 17 and 18, respectively, which are displaced at an acute angle from each other, thereby providing a V-shaped slot capable of being resiliently enlarged as a length of twisted threads is manually wedged or received therebetween.
  • the length of twisted threads T is thus clamped directly within the opposing slots or grooves 19 and 20 so as to always fall in the same linear path extending directly through the heating zone of the apparatus. Also, once held in this groove, there is no tendency for the threads to become dislodged.
  • the heating element for welding together the two threads or yam-ends T and T is best provided by an electrical resistance element or wire 21, which is preferably composed of a platinum alloy characterized by a relatively long life in the welding or heat-bonding process.
  • the heating wire 21 is held by two hollow pins 22 and 23 through which lead wires 24 and 25 provide the necessary electrical current.
  • the pin 22 and/or the pin 23 can be movably clamped in a supporting block 26, for example, by means of the tightening screw 27 so as to move the wire into close proximity or direct contact with the linear path of the threads T.
  • the heating wire should be located within l-2 mm. of the twisted threads, but preferably contacts the outer surface of the threads tangentially.
  • the pin holder or block 26 can be securely mounted on the base 1 by means of screws or bolts 28 (see FIG. 2).
  • the heating element or wire 21 is positioned adjacent to one of the clamping members, preferably at a distance of about 1 cm. or less, and thus provides a localized heating zone which covers only a very short area close to one end of the twisted and clamped length of threads. It is also desirable to arrange the heating wire in such a manner that it cannot be disturbed when the twisted threads are inserted into the clamping device, i.e. directly below the thread position or to one side at an angle as shown in the drawing. in this way, the heating wire 21 and twisted threads T can be very accurately positioned with reference to each other.
  • the clamping apparatus is advantageously arranged within a protective housing or shell 29 which completely encloses the clamping means and the heating element with its supporting structure except for a thread-insertion slot 30 which generally corresponds to the open or thread-receiving position of the clamping jaws 3 and 4.
  • a protective housing or shell 29 which completely encloses the clamping means and the heating element with its supporting structure except for a thread-insertion slot 30 which generally corresponds to the open or thread-receiving position of the clamping jaws 3 and 4.
  • the thread end from a depleted spool or similar thread package and the thread end from a fresh spool can be brought together in a parallel or juxtaposed position and twisted together by hand, the terminal or free ends of both threads pointing in the same direction.
  • This manual twisting of the threads takes place over a length which is somewhat greater than the distance between the two clamping positions so that the twisted threads can be held under tension as they are introduced into the clamping jaws so as to become engaged and clamped in the thread grooves 19 and 20.
  • the individual threads T and T extend from their individual spool positions and run into the apparatus through one pair of jaws.
  • a terminal length of the ends of the threads projects a short distance out of the jaws at the other side of the apparatus, and the length of thread from the heating element to these terminal ends is eventually melted off or severed and then discarded.
  • the threads are then twisted and tensioned in a path which extends through the heating zone of the electrical resistance heating wire 21, and as heat is supplied by turning on the current of the heating element, the outer surface of the twisted threads closest to the heating wire begins to melt first. There is a resulting reduction in tension on the threads caused by this melting which in turn results in the unwinding of the threads under torsional stress with further melting around the entire circumference until the originally twisted length of thread is severed. During this untwisting and melting operation the two distinct threads T and T, become joined at the point of melting, i.e. in the heated zone, and quickly fuse together and solidify as the two separated portions drop down out of the heating zone. The two joined threads are then easily removed laterally from the clamping device, and the shorter scrap length is also removed and discarded.
  • the two thread ends to be joined were held parallel between the thumb and forefinger of both hands and then twisted together until the resulting strand exhibits a twist of about 2 to 3 turns per centimeter.
  • the two twisted threads are fastened between the clamping jaws while held under tension and then released from the hands.
  • the heating wire is then turned on.
  • the two stranded threads turn back again on account of the original twist imparted thereto, whereby the ends of the thread being melted come into mutual contact and are connected after cooling below their melting point.
  • thermoplastic filamentary material which comprises:
  • a method as claimed in claim 2 wherein the twisted length of threads between clamping positions is about 4 to 8 cm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US800049A 1968-02-24 1969-02-18 Method for uniting thread ends Expired - Lifetime US3615991A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1710460A DE1710460C3 (de) 1968-02-24 1968-02-24 Verfahren und Vorrichtung zum Verschweißen der Enden von Garnen und Fäden aus thermoplastischen Kunststoffen

Publications (1)

Publication Number Publication Date
US3615991A true US3615991A (en) 1971-10-26

Family

ID=7130258

Family Applications (1)

Application Number Title Priority Date Filing Date
US800049A Expired - Lifetime US3615991A (en) 1968-02-24 1969-02-18 Method for uniting thread ends

Country Status (9)

Country Link
US (1) US3615991A (de)
AT (1) AT308597B (de)
BE (1) BE727818A (de)
CH (1) CH477584A (de)
DE (1) DE1710460C3 (de)
FR (1) FR2002562A1 (de)
GB (1) GB1218881A (de)
NL (1) NL6902254A (de)
SE (1) SE350541B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160159608A1 (en) * 2014-12-09 2016-06-09 Xyzprinting, Inc. Filament fusing apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD254170A1 (de) * 1986-12-02 1988-02-17 Dresden Elektromaschinenbau Verfahren zum thermischen verbinden von faden- bzw. bandenden aus synthetischen, schmelzbaren materialien
WO1996012112A1 (en) * 1994-10-13 1996-04-25 Eastman Chemical Company Method and apparatus for forming splices in flexible, fusible material and material spliced accordingly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160159608A1 (en) * 2014-12-09 2016-06-09 Xyzprinting, Inc. Filament fusing apparatus
US9481545B2 (en) * 2014-12-09 2016-11-01 Xyzprinting, Inc. Filament fusing apparatus

Also Published As

Publication number Publication date
CH477584A (de) 1969-08-31
AT308597B (de) 1973-05-15
NL6902254A (de) 1969-08-26
GB1218881A (en) 1971-01-13
DE1710460A1 (de) 1971-10-28
BE727818A (de) 1969-07-16
DE1710460B2 (de) 1977-07-21
FR2002562A1 (de) 1969-10-17
DE1710460C3 (de) 1978-04-06
SE350541B (de) 1972-10-30

Similar Documents

Publication Publication Date Title
US4560427A (en) Ultrasonic seal and cut method and apparatus
US4430139A (en) Apparatus for manufacturing cable
US2535029A (en) Method and apparatus for cutting fusible fabrics
CN211866458U (zh) 钢帘线切割端制备装置和用于焊接钢帘线的焊接机
US3615991A (en) Method for uniting thread ends
US3055786A (en) Filament handling process and apparatus
CN112553771A (zh) 接纱装置和具有接纱装置的经编机
JPH07207543A (ja) たて糸ストリップの巻き取り装置及びその方法
US5598694A (en) Apparatus and method for forming alternate twist-plied yarns and product
JPH04100956A (ja) 経糸継ぎ方法
US5356498A (en) Method and apparatus for forming splices in flexible, fusible material and material spliced accordingly
JP2006241667A (ja) テープ、特に柄入りラベルテープの製造のための方法及び設備
US6554930B1 (en) Method and apparatus for connecting cords/filaments
SU1183328A1 (ru) Автомат для сварки термопар
JPH0999918A (ja) 包材用フィルムの溶断溶着方法及びその装置
WO1989009730A1 (en) Method and apparatus for bonding tear-open system to packaging film in tape form
JPH084222Y2 (ja) コード熔断装置
JPH0747104Y2 (ja) ミシンの上糸保持装置
KR820000236Y1 (ko) 합성수지접합 나이론 재봉사
JPS6063821A (ja) 絶縁電線の連続製造方法
JPH1179559A (ja) 弾性糸の接合方法および接合装置および接合された弾性糸
JPH04146243A (ja) 捨耳緯糸脱落防止装置
WO2000037722A1 (en) Method and apparatus for connecting cords/filaments
KR790001151B1 (ko) 합섬포지 절단방법
JPH0113042Y2 (de)