JP2020203793A - Friction disc for thread coupler - Google Patents

Abstract

To provide a method for manufacturing a friction disc for a thread coupler.SOLUTION: Friction discs 16 for a thread coupler for coupling two yarn ends without a nodal point and include: respective support bodies which are relatively rotatably supported for each other so as to add mechanical friction action to the yarn ends to couple; and friction linings arranged on the support body. One of friction discs is formed by multi-parts and has a center member, an inner ring and an outer ring supported movably in an axial direction; the other friction disc has at least a center member and a ring. At least one friction disc includes a friction lining manufactured by foamed plastic.SELECTED DRAWING: Figure 2

Description

The present invention relates to a friction disc for a yarn binding device, a yarn binding device including such a friction disc, and a textile machine for manufacturing a take-up package including such a yarn binding device. Furthermore, the present invention relates to a method of manufacturing such a friction disc for a yarn coupling device.

In the textile industry, yarn binding devices have long belonged to the prior art and are described in detail in numerous patent applications. The yarn binding device forms a yarn binding portion substantially the same as the yarn by entwining or twisting the two yarn end portions. Such a yarn joint is an important criterion for yarn quality, and it is desired that the yarn not only has strength similar to that of yarn but also has the same appearance as that of yarn as much as possible.

During the manufacturing process, if a yarn break occurs in the textile machine that manufactures the take-up package, or in one of the multiple working units of the textile machine, a clearing cut defined based on the yarn anomaly is performed. When so, the thread ends of the separated threads are first returned to the area of the thread coupling or splicing device by a dedicated pneumatic device. In this case, the suction nozzle returns the so-called needle thread from the twill-wound package and inserts the needle thread into the thread coupling device after clearing the thread abnormality in some cases, that is, after removing it. Correspondingly, so-called bobbin yarn coming from, for example, one coarse yarn bobbin positioned at the feeding position is also inserted into the yarn coupling device by a gripper tube capable of supplying negative pressure.

The principle of mechanical splicing or splicing is that the needle and bobbin yarns are first untwisted by reverse rotation of the friction disc and then twisted / twisted again. After untwisting, the yarn ends are cut short so that they overlap only within the restricted area and can be spliced with each other.

According to European Patent Application Publication No. 0120523, a yarn coupling device including two friction discs that can be driven in opposite directions to apply mechanical friction to the two yarn ends is disclosed. The yarn end is first positioned, untwisted and torn between the two friction discs at the start of the yarn binding process. The thread ends are now bundled by so-called combs to locally limit and bundle the brush-like thread ends, which no longer have twists and the fibers are present approximately parallel to each other. They are then spliced together, that is, twisted together.

The yarn coupling device according to European Patent Application Publication No. 0120523 has two friction discs, each with one untwisting and twisting ring means, which cooperates with the twisting means at least temporarily, and tears or tears the yarn. It includes a means of plucking, a means of clamping the yarn in areas where the yarn is not torn to retain the twist, and an internal tightening means that acts on the yarn for at least a short time. Further, a yarn connecting means which comprises a guide means and a hollow chamber accommodating the guide means and which are close to each other for at least a short time, a twist compensating means which acts on the yarn end at least temporarily, and a fiber at the yarn end There are guiding means that bring the yarn end close to the adjacent complete yarn, and at least temporarily a plucking and / or tearing means that acts directly along the axis of the yarn end. ing.

The friction disc has a support and a friction lining. In practice, friction linings made of rubber-coated material with ridges or grooves are known. To ensure reliable untwisting and / twisting of the yarn, on the one hand a lot of friction can be applied to the yarn and on the other hand between friction discs or friction linings against each other. A friction lining that generates less friction is required. Further, the friction discs are used only within the limited angular regions corresponding to the angular regions in which the friction discs are rotated in opposite directions. Friction lining wear occurs exclusively in this area. The result is simply a short service life for friction discs.

Therefore, the first aspect of the present invention relates to a friction disc for a yarn coupling device for joining two yarn ends without a knot, and the friction disc has a mechanical friction action on the yarn end to be bonded. They are rotatably supported relative to each other to add, each containing one support and a friction lining placed on the support.

The friction disc has a central member, an inner ring and an outer ring in which one of these friction discs is formed from multiple parts and is supported so as to be movable in the axial direction, and the other. Friction discs have at least a central member and a ring, and at least one friction disc contains a friction lining made from foamed plastic.

When one of the friction discs is formed from multiple parts and the individual members are supported so as to be movable in the axial direction, the untwisting of the yarn end and the twisting / twisting of the yarn are trusted. It can be guaranteed sexually. The axially movable center member of the friction disc can further ensure a secure clamp of the thread in tearing. With such a configuration of at least one friction disc, the individual members can be fed individually, or at least partially together, to the second friction disc or in contact with the second friction disc. Can be done. The second friction disc has at least a central member and a ring. The friction disc may be formed in one piece, i.e. integrally or from multiple parts. Within the framework of the present invention, it is similarly possible that both friction discs are movably formed from multiple parts and / or axially.

During the take-up or spinning process, the friction discs are positioned apart from each other in the open position. When the thread binding process is started, both the needle thread and the bobbin thread are inserted into the thread binding device. For untwisting and twisting the yarn, and for clamping, at least a plurality of members of at least one friction disc are brought into contact with or act-bonded to the second friction disc. To this end, both friction discs have regions of symmetry that correspond to each other. Within the framework of the present invention, the friction disc may be configured with a so-called notch or may be configured without a notch. In friction discs that include such notches, the notches are usually provided for engagement of guide means for bundling the fibers at the end of the cut brush-like thread.

On the one hand, the yarn must be sufficiently clamped between the friction discs to ensure reliable untwisting and / twisting of the yarn, which can also cause the yarn to slip. Without deviation, on the other hand the yarn is not over-compressed or crushed, which allows it to be untwisted or twisted. In this case, the friction lining is subject to special requirements. The friction lining, which is made from foamed plastic, offers the advantage that the material, due to its high elasticity, can successfully embed threads with very little pressing force. Further, each thread is easily untwisted and twisted by a minute shape bond. Foaming of plastics is a method known per se for forming closed-cell, open-cell or mixed-cell foams. A friction lining made of foamed plastic makes it possible to manufacture a friction lining at a low cost.

Depending on the materials used and the manufacturing method, foaming materials having a special required shape (profile) can be manufactured. In conventional manufacturing processes, foaming is often obtained from polymer melts and gaseous foaming agents. However, for example, it is also possible to use a microscopically small mold to give the foam a particular structure. Basically, the processing and processing of foaming materials is easily possible with a small tool cost.

The foamed friction lining can sufficiently apply friction to each yarn for untwisting and twisting. Foamed friction linings, on the one hand, apply as much friction as possible to each thread, and on the other hand, adapt both of the two main conflicting requirements of reducing friction between friction linings to each other as needed. be able to. The friction lining can be attached to the support by known bonding techniques such as bonding or vulcanization.

In the prior art, a high friction value (friction force) and a high pressing force of the friction lining are required so that the reverse rotation of the friction disc can be reliably transmitted to the thread. High drive torque would be required to drive the friction disc in this way and high wear of the friction lining would have to be considered. In the prior art, friction discs include so-called spacing means to reduce drive torque and wear. This spacing means holds the surface of the friction disc, and thus the friction lining, at least temporarily at the desired spacing. This spacing means is usually made of hardened steel and is supported on the opposite side of the support's abutment surface (Spur) to hold the friction linings at minimal spacing to each other. .. The metal-to-metal frictional force is significantly smaller than the frictional force between the friction linings. The spacing must be adjusted from zero to at least less than the yarn diameter. As a result, the yarn can be reliably untwisted or twisted. Based on this interval, friction discs are subject to extremely high precision requirements and are relatively costly to manufacture. Experiments have shown that the spacing means can be omitted when using foamed plastic. This is because the material, due to its high elasticity, optimally embeds the yarn between the friction linings even with very little pressing force. Since the accuracy requirement at the time of manufacturing the friction disc is low when there is no space holding means, the friction disc according to the present invention can be manufactured at an extremely low cost.

In particular, at least one friction disc includes a friction lining having at least two friction regions.

A locally restricted region in which the yarn is inserted, untwisted and twisted is understood as the friction region. Since these threads are needle threads and bobbin threads, each friction disc or friction region on each friction lining is formed by two areas located facing each other.

If the foamed friction lining has at least two friction regions, i.e. two or four friction regions, the useful life of the friction disc can be at least doubled. Previously, the friction disc had to be completely replaced due to wear on the friction lining, but now it can be reused with a new installation that has been displaced.

In an advantageous configuration, at least one friction disc includes a friction lining whose entire surface is formed as a friction region.

Within the framework of the present invention, the entire friction lining can be used as the friction region to further extend the useful life of the friction disc. If the friction disc contains a notch for engaging the guide means for bundling the fibers at the cut brush-like thread end, the cut brush after untwisting and tearing the thread end. The notch must extend approximately across the annular surface of the friction disc to ensure that the guiding means for bundling the shaped thread ends engage within the notch of the friction disc. .. Therefore, since the friction discs consist mostly of multiple concentric rings that are connected to each other via the web, the individual components of the friction discs, such as rings, outer rings or inner rings, are still present. Each can be considered as one. The advantage of this configuration is that the entire annular surface of the friction disc can be used as the friction region.

Preferably, at least one friction disc has two functional surfaces. The surface of the friction disc with the friction lining forms the functional surface. Further extension of the service life of the friction disc can be achieved if the friction disc is structurally configured to have two functional surfaces each. For this purpose, the support of the friction disc has a friction lining made of foamed plastic on both sides. When the friction disc needs to be replaced, the friction disc can be taken out, flipped over and inserted again.

Therefore, the second aspect of the present invention is a thread coupling device provided with a friction disc for joining two yarn ends without a knot, and the friction disc is mechanically attached to the yarn end to be bonded. The present invention relates to a thread coupling device, which is rotatably supported relative to each other to add a frictional action, each including one support and a friction lining disposed on the support.

The thread binding device is superior because the thread binding device comprises at least one friction disc formed as in one of the above embodiments. This allows the benefits and effects described in relation to friction discs to be achieved.

Such a configuration of the thread binding device, on the one hand, simplifies the production of the friction lining and makes the production cheaper, and on the other hand, to operate the thread binding device by significantly extending the useful life of the friction disc. It brings the advantage of being able to reduce the overall cost of. In terms of manufacturing technology, it is more advantageous to manufacture a friction disc having a plurality of friction regions and / or two functional surfaces than a plurality of friction discs each having one friction region. In addition, the foamed plastic allows the use of different materials with different structures and / or strengths. An advantageous configuration of a thread binding device with at least one friction disc thus constructed is easy to implement and always guarantees a reliable and high quality thread binding.

Therefore, a third aspect of the present invention relates to a textile machine for producing a take-up package, which comprises a yarn binding device for binding two yarn ends without a knot.

Textile machines that manufacture take-up packages are superior because at least one yarn binding device is formed as in one of the above embodiments.

Such a configuration of the yarn binding device allows the production of high quality yarn bindings on the one hand, thus forming overall high quality yarns and the cost of operating the textile machine on the other hand. Can be reduced. Because the friction disc can be used longer due to the corresponding configuration and new positioning within the thread coupling device, the quality to the splicing part (joint part) due to the longer use of the friction disc. This is because no damage occurs.

The present invention also relates to a method of manufacturing a friction disc according to one of the above embodiments.

In the proposed method, one of the friction discs is configured to include a central member, an inner ring and an outer ring that are axially movably supported, and the other friction disc is at least. It is better configured to include a central member and a ring, with at least one friction disc having a friction lining made from foamed plastic.

This form allows the production of friction linings with the desired and defined structure and / or strength. Within the framework of the present invention, different structures and / or strengths are possible. The corresponding foaming material can be selected depending on the material to be treated.

Another feature and advantage of the invention is apparent from the following description and claims of preferred embodiments of the invention with respect to the drawings and drawings showing important details for the invention. Each individual feature may be realized individually in one advantageous embodiment of the invention, or in any combination of plurals.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

It is a side view which shows the working unit of the winder equipped with the thread coupling device. It is the schematic of the thread coupling apparatus provided with the friction disc formed by this invention. It is a schematic diagram of a friction disc set provided with two friction regions and two functional surfaces. It is the schematic of the friction disc which the whole surface is formed as a friction region.

In FIG. 1, a textile machine for manufacturing a take-up package, which is generally indicated by reference numeral 1, a take-up machine in this embodiment is schematically shown in a side view.

Such a winder 1 usually has a plurality of working units 2 of the same type between its (not shown) end positions. In this working unit 2, since it is known, it will not be described in detail, but for example, a spinning cup 9 manufactured in a ring spinning machine is rewound into a large-capacity twill winding package 15.

The twill-wound package 15 is delivered to the twill-wound package transfer device 21 over the machine length by a service unit that automatically works after manufacturing, preferably by a twill-wound package changer (not shown), and ends at the end of the machine. It is transported to a package loading station or the like located on the side.

Such a winder 1 usually further has a distribution device in the form of a bobbin / winding tube transport system 3. In this bobbin / winding tube transport system, the spinning cup 9 or the empty tube circulates in the vertical direction on the transport pan 8. Of the bobbin / winding tube transport system 3, FIG. 1 shows one of a cup supply section 4, a storage section 5 that can be driven in the opposite direction, and a lateral transport section 6 that is guided toward the work unit 2. Only the lateral transport section and the winding tube return section 7 are shown.

Further, such a winder 1 usually has a central control unit (not shown). This central control unit is connected to the work unit computer 29 of the individual work unit 2 and the control device of the service unit via a mechanical bus.

As suggested above, the supplied spinning cups 9 are rewound into the large capacity twill winding package 15 at the feeding position ASs located in the regions of the lateral transport sections 6 in the working unit 2, respectively.

The individual working units 2 have a variety of different devices for this purpose, as simply suggested as they are known. These devices ensure that the working unit operates as specified. These devices are, for example, a suction nozzle 12 for operating the needle thread 31 which is restricted and rotatable about the first swivel axis 13, and a bobbin thread which is rotatable around the second swivel axis 20. A thread binding device 10 in which a gripper tube 25 for operating 32 and a needle thread 31 and a bobbin thread 32 are inserted to carry out a thread binding step.

Such a working unit 2 usually further includes other devices (not shown) such as a thread tensioner, a thread clearer, an oil coating device, a thread cutting device, a thread tension sensor and a bobbin thread sensor.

The winding of the twill winding package 15 is performed by the winding device 24. Such a winding device 24 has, in particular, a package frame 28 movably supported around a third swivel axis 22 and a device for rotatably holding the twill-wound package winding tube. .. During the take-up process, the surface of the twill-wound package 15 rotatably supported within the package frame 28 is placed on the package drive drum 14 and driven by the package drive drum 14 via friction stir welding. ..

FIG. 2 schematically shows a thread coupling device 10 provided with a casing 11, one of the friction discs 16, the region between the friction discs 16, and the upper and lower sides of the friction discs 16. Area can be confirmed.

In order to connect the two thread ends, that is, to connect the needle thread 31 and the bobbin thread 32, the needle thread 31 is positioned between the friction discs 16 by the suction nozzle 12 and the bobbin thread 32 is positioned by the gripper tube 25. Will be done. To this end, the yarn is guided via a yarn guiding means 30 for ensuring the prescribed insertion of the yarn end into the yarn coupling device 10 and a yarn separating means 33 for later cutting the yarn. Will be done.

In the simplest configuration of the thread coupling device 10, only a part of the friction disc 16 formed from many parts is supported so as to be movable in the axial direction, whereas the other friction disc 16 is fixedly supported. Has been done. However, basically, both friction discs 16 may be supported so as to be movable in the axial direction. In this embodiment, the central member 17, the inner ring 18, and the outer ring 19 of the friction disc 16 formed from the plurality of portions can be individually moved in the axial direction.

After positioning the needle thread 31 and the bobbin thread 32 between the friction discs 16, the outer ring 19 is fed to the ring 23 of the friction disc 16 located on the opposite side, so that both threads are directly between the friction discs 16. Is located in contact with. Both friction discs 16 are driven in opposite directions of rotation in order to untwist or untwist the needle thread 31 and the bobbin thread 32.

Following this, a movable center member 17 is fed to the center member 17 of the friction disc 16 located on the opposite side in order to clamp the needle thread 31 and the bobbin thread 32. The outer ring 19 is brought into contact with the ring 23 for a short period of time, during which the thread separating means 33 tears or cuts the needle thread 31 and the bobbin thread 32. The residual yarn located in the yarn separating means 33 is sucked up by the suction nozzle 12 and the gripper pipe 25 and removed. The thread ends of the needle thread 31 and the bobbin thread 32 remain between the friction discs 16. These thread ends do not have twists, thereby forming brush-shaped thread ends, respectively. Individualized fibers are present in the brush-shaped thread end.

After cutting, both the inner ring 18 and the outer ring 19 are axially moved and fed to the central member 17 and ring 23 of the friction disc 16 located on opposite sides. Both friction discs 16 have a notch 26. The guide means 27 can be engaged in the notch 26. The guide means 27 maintains a substantially parallel orientation of the fibers after removal of the yarn twist and cutting of the needle yarn 31 and the bobbin yarn 32 so that the brush-like yarn ends are centered or bundled. As it works, the fibers at the end of the yarn can be twisted together by a new reverse rotation of the friction disc 16.

The central member 17 is opposed to the central member 17 before the friction disc 16 is driven again in the opposite direction of rotation to twist or twist the yarn ends of the needle thread 31 and the bobbin thread 32. It is moved in the axial direction so as not to come into contact with the central member 17 located on the side.

FIG. 3 shows a set of friction discs 16. Of the friction discs 16, the friction disc 16 on the right side in FIG. 3 is formed from a large number of parts and has a central member 17, an inner ring 18, and an outer ring 19. A friction lining 35 is applied onto the support 34. The surface of the friction disc 16 having the friction lining 35 coincides with the functional surface 37. As can be seen for the friction disc 16 illustrated on the left side, the support 34 is provided with friction linings 35 on both sides, so there are two functional surfaces 37 in this embodiment. Further, the friction disc 16 has a central member 17 and a ring 23.

Each friction disc 16 illustrated in FIG. 3 has two friction regions 36. One friction region 36 is formed by two regions located on opposite sides of the friction disc. Within this region, the needle thread 31 and the bobbin thread 32 are overlapped and positioned between the friction discs 16.

FIG. 4 illustrates an alternative configuration of the friction disc 16. Illustratively, only the friction disc 16 formed from multiple parts having a central member 17, an inner ring 18 and an outer ring 19 is shown. The support 34 is coated with a friction lining 35 made of foamed plastic.

Therefore, the friction disc 16 has a friction region 36 extending over the entire surface of the functional surface 37. The notch 26 of the friction disc 16 is formed almost consistently in the radial direction and is divided only by the web 38.

1 Textile machine that manufactures take-up packages 2 Work unit 3 Bobbin / winding tube transfer system 4 Cup supply section 5 Storage section 6 Lateral transfer section 7 Winding tube return section 8 Transport dish 9 Spinning cup 10 Thread coupling device 11 Casing 12 suction Nozzle 13 1st swivel axis 14 Package drive drum 15 Twill winding package 16 Friction disk 17 Center member 18 Inner ring 19 Outer ring 20 2nd swivel axis 21 Twill winding package transfer device 22 3rd swivel axis 23 Ring 24 Winding Equipment 25 Gripper tube 26 Notch 27 Guide means 28 Package frame 29 Work unit Computer 30 Thread guide means 31 Upper thread 32 Lower thread 33 Thread separation means 34 Support 35 Friction lining 36 Friction area 37 Functional surface 38 Web

Claims (7)

A friction disc (16) for a yarn coupling device (10) for joining two yarn ends without a knot, and the friction disc (16) mechanically rubs against the yarn end to be bonded. They are rotatably supported relative to each other to add action, each containing one support (34) and a friction lining (35) disposed on the support (34). , In the friction disc (16)
One of the friction discs (16), the friction disc (16), is composed of a large number of parts and is supported so as to be movable in the axial direction. A central member (17), an inner ring (18) and an outer ring. Has (19)
The other friction disc (16) has at least a central member (17) and a ring (23).
A friction disc (16), characterized in that at least one friction disc (16) includes a friction lining (35) made of foamed plastic. The friction disc (16) according to claim 1, wherein at least one friction disc (16) includes a friction lining (35) having at least two friction regions (36). The friction disc (16) according to claim 1, wherein at least one friction disc (16) includes a friction lining (35) whose entire surface is formed as a friction region (36). The surface of the friction disc (16) having the friction lining (35) constitutes the functional surface (37), and at least one friction disc (16) has two functional surfaces (37). The friction disc (16) according to claim 1. A thread coupling device (10) provided with a friction disc (16) for joining two yarn ends without nodal points, wherein the friction disc (16) is mechanically attached to the yarn end to be bonded. A support (34) and a friction lining (35) arranged on the support (34), which are rotatably supported relative to each other in order to apply a frictional action. In the thread coupling device (10), which includes
The thread binding device (10) comprises at least one friction disc (10) according to any one of claims 1 to 4. A textile machine (1) for manufacturing a take-up package, provided with a yarn binding device (10) for joining two yarn ends without a knot.
A textile machine (1), wherein at least one yarn binding device (10) is the binding device according to claim 5. The method for manufacturing the friction disc (16) according to claim 1.
One of the friction discs (16) is often such that it has a central member (17), an inner ring (18) and an outer ring (19) that are pivotally supported. Composed of parts,
The other friction disc (16) is configured to have at least a central member (17) and a ring (23).
A method, characterized in that at least one friction disc (16) is provided with a friction lining (35) made of foamed plastic.