Classifications

• • 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
  • D03D47/34—Handling the weft between bulk storage and weft-inserting means

Definitions

• the invention relates to a device for feeding and regulating a thread for a textile machine, in particular a weaving machine, according to the preamble of claim 1.
• the thread control device described there has a leg spring which contains a thread guide eyelet which releases the thread in a first position and in a second position in a clamping device introduces which is formed by a resilient element which forms a tapering gap with a fixed machine part. It is very disadvantageous here that the thread clamped in the tapering gap can be damaged by the scraping of the thread in the gap both during the clamping and during the loosening at the beginning of the thread transport.
• the device for both exemplary embodiments has a thread tensioning device which is connected upstream of the thread transport roller.
• the object of the invention is to design a device of the type mentioned at the outset such that on the one hand jerk-free thread transport is possible and on the other hand the device has a simple structure.
• the thread control device effects the transport of the thread solely on the basis of the position of the thread guide eyelet and the friction behavior in the thread control device or on the thread transport roller
• active thread braking devices can be dispensed with and the thread control device can be connected directly to the thread transport roller. This results in a much simpler structure of the device.
• this training enables in particular a very gentle control of the thread transport, which adapts directly to the needs and in which no voltage fluctuations occur, as would be caused by an additional active braking device. This results in a thread transport that adapts optimally to the needs of the weaving machine.
• Advantageous refinements of the device for feeding and regulating a thread are described in claims 2 to 5 and 7 to 16.
• the thread control device can be designed according to claim 2, but an embodiment according to claim 3 is more advantageous, since here the thread must always be guided through two movable guide eyes, whereby a correspondingly greater frictional resistance arises.
• the two loops which are formed by the fixed thread guide and the two thread guide eyelets, allow a larger thread supply to be produced in the smallest space.
• this design enables the arrangement of additional fixed thread guides in a simple manner, as a result of which the frictional resistance can be changed further.
• Claim 4 describes a very simple arrangement and guidance of the thread guide eyelets.
• An embodiment according to claim 5 and / or 10 is also advantageous, since the additional fixed thread guide or thread guide eyelet, which is used in the second position of the movable thread guide eyelet, but not in the first position, can generate additional frictional resistance is desired in the second position of the thread guide eyelet. However, in the first position of the thread guide eyelet, in which the thread is to be transported, this additional frictional resistance does not exist.
• the fixed thread guide eyelet according to claim 10 can preferably be arranged according to claim 15.
• the advantageous effects of the thread guide eyelet can also be achieved with an arrangement according to claim 16.
• Figure 1 shows a thread transport device with a thread control device which has two moving thread guide eyes
• Figure 2 shows a thread transport device with a thread control device which has a moving thread guide eyelet
• FIG. 3 shows a thread transport device with a thread control device, the thread guide eyelet of which influences the wrap angle on the thread transport roller;
• FIG. 4 shows the thread transport device according to FIG. 1 with a second thread guide eyelet, which influences the wrap angle on the thread transport roller;
• Figure 5 shows the thread transport device of Figure 1 with an additional fixed thread guide eyelet
• Figure 6 shows the fixed thread guide eye of Figure 5 in plan view
• Figure 7 shows the thread guide eyelet of Figure 6 with an additional friction lining
• Figure 8 shows another fixed thread guide eyelet with a twisted eye part in plan view
• FIG. 1 shows a first type of thread guide in a textile machine, preferably an indicated ribbon loom.
• a thread 4 runs from a supply spool 2 to a thread transport roller 6 which is continuously driven.
• the Fadent transport roller 6 has a circumferential groove 8 in which the thread 4 loops around the Fadent transport roller 6.
• a downstream thread control device 10 takes over the thread 4 from the thread transport roller 6.
• the thread expensive device 10 contains two thread guide eyelets 12, 14 which on one Leg spring 16 are arranged so that they are held resiliently. Between the thread guide eyes 12, 14, the thread 4 is placed over a fixed thread guide 18.
• the thread coming out of the thread guide eyelet 14 is guided to a weft thread insertion member 20, which inserts weft thread loops 22 into the warp pocket of a ribbon loom formed by warp threads 24.
• the thread guide eyes 12, 14 are at a small distance from the fixed thread guide 18.
• the biasing force of the leg spring 16 is greater than in the second position II, which is indicated by dashed lines and in which the thread guide eyes 12, 14 are at a greater distance from the thread guide 18.
• the thread control device 10 forms a thread supply 26 and the outgoing thread lies against an additional fixed thread guide 28, which can be provided with a friction lining.
• the weft insertion element enters a weft loop 22 into the warp compartment, as a result of which greater thread tension acts on the thread control device 10, so that the leg spring 16 is tensioned and the thread guide eyes 12, 14 assume the first position I.
• This increased thread tension continues to the thread transport roller 6, so that the thread 4 is brought into abutment against it and the thread transport roller 6 pulls the thread from the supply spool 2 by the frictional engagement of the thread 4 and feeds it to the thread control device 10.
• the weft thread loop 22 is tied in a known manner on the fabric edge and the weft thread insertion member 20 moves back out of the warp compartment, with no thread transport.
• the thread supply 26 is formed in the thread control device and the leg spring 16 is relieved to the second position II, in which the pretension is so low that it is no longer sufficient to carry one on the thread transport roller 6 for thread transport to effect necessary frictional intervention.
• the thread trans po rt roll 6 spins empty. If the weft insertion element 20 moves again in the direction of the warp compartment, the thread supply 26 is used up and the leg spring 16 is stretched again until a new thread transport takes place. Since the transitions of the individual thread transport phases are fluent, there is also a very gentle and gentle thread transport, which nevertheless provides the tension required for the insertion of the weft thread loop.
• the thread transport device shown in FIG. 2 differs only in a modified thread control device 30, so that the same parts are provided with the same reference numerals as in FIG. 1.
• the thread control device 30 contains only a thread guide eyelet 32 on a leg spring 34 which guides the thread 4 between two fixed thread guides 36, 38 and forms the thread supply 40.
• a first position I of the leg spring 34 with the thread guide eyelet 32 is shown in solid line and the second position II is indicated by dashed lines.
• the mode of operation of the thread transport device in FIG. 2 corresponds to that in FIG. 1, so that reference is made to the statements there.
• the thread transport device of FIG. 3 differs from the previous thread transport devices of FIGS. 1 and 2 by a further modified thread control device 42.
• the latter has only one thread guide eyelet 44 on a leg spring 46.
• the thread guide eyelet 44 assumes a position in which a large wrap angle ⁇ 1 for thread transport on the thread transport roller 6 is achieved.
• the yarn guide eyelet 44 forms a yarn reserve 48, and reduces the angle of wrap to a smaller value ⁇ 2, connected ransportrolle in which the lower thread tension of the frictional engagement of the thread 4 on the Fadent 6 is insufficient more to form a thread transport to cause.
• Figure 4 shows a development of the thread transport device of Figure 1, wherein the thread control device 10 in addition to the first thread guide eyes 12, 14 has a second thread guide eye 50, which is arranged on the side of the thread transport roller 6 facing away from the first thread guide eyes 12, 14.
• This second thread guide eyelet is attached to a leg spring 52, by means of which the second thread guide eyelet 50 is biased away from the thread transport roller 6.
• the second thread guide eye 50 In the first position I of the first thread guide eyes 12, 14, the second thread guide eye 50 also takes a first one Position IA in which it is close to the circumference of the thread transport roller 6 and thus forms the largest wrap angle ⁇ 3 and ⁇ 4 .
• the second thread guide eye 50 moves under the influence of the leg spring 52 to form a further thread supply 54 in the second position IIA.
• the looping angle is reduced by the values ⁇ 5 and ⁇ 6 , so that the frictional engagement on the thread transport roller 6 is reduced to such an extent that the thread transport is interrupted.
• the functioning of the second thread guide eyelet 50 is facilitated if it is arranged closer to the drain point 56 than to the run-on point 58 of the thread 4 on the thread transport roller 6.
• This additional equipment of the thread control device with a second thread guide eyelet according to the exemplary embodiment of FIG. 4 can also be used in the thread transport devices according to FIGS. 2 and 3.
• FIG. 5 shows a further developed thread transport device of FIG. 1.
• the thread transport device contains an additional fixed thread guide eyelet 60 which is arranged between the thread transport roller 6 and the movable thread guide eyelet 12 on the machine frame 62.
• the thread guide eyelet 60 contains two guide areas F1 and F2 with different friction properties. In the first position I of the movable thread guide eyelet 12, the thread 4 is in the guide area F1 with lower friction properties and in the second position II of the movable thread guide eyelet 12 in the guide area F2 higher friction properties.
• the thread guide eyelet 12 guides the thread 4 from the guide area F1 into the guide area F2, which makes the thread transport at the fixed thread guide eyelet 60 more difficult and the further rotating thread transport roller 6 from the Thread tension is relieved.
• the fixed thread guide eyelet 60 tapers against the guide area F2 of the guide opening 64 and thereby forms an opening angle ⁇ of preferably less than 20.
• the fixed thread guide eyelet 60 is inclined in the transport direction of the thread 4 at an angle of inclination ⁇ against the guide region F2 of higher friction properties, as can be seen from FIG. 5.
• the fixed thread guide eyelet 60 preferably consists of a bent wire 66.
• the thread guide eyelet 60 contains a fastening eyelet 68, by means of which it is fastened to the machine frame 62 by means of a screw 60.
• a tab 72 holds the free wire end 74, which has formed the guide opening 64.
• Figure 7 shows the fixed thread guide eyelet of the figure
• FIGS. 8, 8a and 8b show a further thread guide eyelet 78, made of a wire 66, which forms the guide opening 80.
• the wire 66 is twisted by 180 at the transition point F3 between the guide areas F1 and F2 with different friction properties.
• the thread 4 is simply guided, as can be seen from the section in FIG. 8a.
• the thread is guided in an S-shape due to the twisting, as can be seen from FIG. 8b, which results in an increase in the frictional resistance.
• a fixed thread guide eyelet with guide areas of different friction properties of the aforementioned type can also be arranged in the other exemplary embodiments, as is indicated, for example, for the thread guide eyelet 82 in the example in FIG. 3 and the thread guide eyelet 84 in the example in FIG. 4.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Looms (AREA)
• Tension Adjustment In Filamentary Materials (AREA)
• Guides For Winding Or Rewinding, Or Guides For Filamentary Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4268915

Family Applications (1)

Country Status (7)

Families Citing this family (8)

Family Cites Families (13)

• 1983
  • 1983-11-12 DE DE19833341042 patent/DE3341042A1/de not_active Withdrawn
• 1984
  • 1984-07-23 ES ES534552A patent/ES534552A0/es active Granted
  • 1984-07-24 WO PCT/CH1984/000116 patent/WO1985000625A1/de not_active Application Discontinuation
  • 1984-07-24 EP EP84902776A patent/EP0151156A1/de not_active Withdrawn
  • 1984-07-24 JP JP59502777A patent/JPS60501907A/ja active Pending
  • 1984-07-24 US US06/720,413 patent/US4646792A/en not_active Expired - Lifetime
  • 1984-07-25 IT IT22051/84A patent/IT1176479B/it active

Non-Patent Citations (1)

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