Workstation of a double wire twisting or cabling machine for the production of carpet yarn

Abstract

Workstation (2) of a double-wire twisting or cabling machine (1) for the production of carpet yarn, comprising a winding device (11) comprising a spool frame (17) with two frame arms for rotatably supporting an empty spool (18) or twisted spool (16), a spool drive roller (19) for frictionally driving the twisted spool (16), a thread changing device (20) for alternately laying a thread onto the twisted spool (16), a pre-roller (23) for regulating thread tension, and a cover (21) in the area of ​​the pre-roller (23) with a recess (22) for the thread guided by the thread changing device (20) to the twisted spool (16), characterized by that the coil frame (17) has at least one movable frame arm mounted with limited rotatability and is designed in such a way that an empty sleeve (18) with a length of at least 315 mm can be inserted, that the spool drive roller (19) has a length of at least 286 mm, that the thread changing device (20) performs a changing stroke of at least 279.4 mm (11 inches), and that the recess (22) in the cover (21) corresponds to the thread path created by the changing stroke.

Description

[0001] The invention relates to a working station of a double-wire twisting or cabling machine for the production of carpet yarn, a double-wire twisting or cabling machine with such a working station, and a method for operating a double-wire twisting or cabling machine.

[0002] Twisting, cabling, or cording are mechanical yarn finishing processes used to create specific performance characteristics in the yarn. While in the double-wire twisting process two or more yarns are twisted together to form a single strand, cabling is a special twisting process in which two threads are twisted together without the individual threads themselves being twisted. The advantage of twisted yarns lies in their higher tensile strength.

[0003] For the purposes of this application, the term "thread" is intended to encompass all linear structures, such as yarns, foil strips, tubular and ribbon-shaped textiles, and the like. For the sake of simplicity, the term "thread" is used synonymously with the possible alternatives within the scope of this application.

[0004] A cabling machine, for example, typically has a number of workstations arranged side by side along the machine's length. Each workstation comprises a spindle onto which a feed spool is mounted, and a mounting device attached to the machine frame that holds a second feed spool. The threads are unwound from the feed spools, their tension is kept constant by thread brakes, they are cabling, and then wound onto a yarn spool in a winding unit.

[0005] During operation of the cabling spindle, the first feed spool is arranged in a spool holder on the rotating spindle. The spool holder and feed spool itself are secured against rotation. From this first feed spool, an inner thread is drawn axially upwards and guided by an inner thread brake on its way to the cabling or joining point with the outer thread.

[0006] The second feed spool, from which the outer thread is taken, is arranged in a creel. After the outer thread passes an outer thread brake and, if necessary, a deflection device, it enters the hollow spindle axially from below and exits the spindle at the circumference of a storage disk. Forming a thread balloon, the outer thread rotates around the spool housing and is guided to the balloon thread guide. At this point, the outer thread winds around the inner thread, which is why this is also called the cabling point.

[0007] Above the cabling point, a take-off device is arranged by means of which the yarn, also called cord thread, is taken off and fed via a compensating element, such as a dancer, to a winding device. The winding device comprises a drive roller, a yarn changing device, and the yarn or lead-in spool, which is driven by the drive roller via frictional engagement.

[0008] Carpet yarns are typically manufactured using starter spools with a predetermined maximum diameter of approximately 400 mm. This standard size of starter spools, which become feeder spools in subsequent processes and are therefore still referred to as yarn spools, results from the maximum diameters that can be processed in the following processing steps, such as heatsetters, weaving, or tufting. The feeders in the feeder screens for further processing of the yarn spools are designed for a maximum diameter of approximately 400 mm.

[0009] The cylindrical blanks used to manufacture the thread spools are also standardized, with an inner diameter of 73 mm and a length of 290 mm. They are wound with a standard oscillation stroke of 254 mm (10 inches). The oscillation stroke refers to the extent of the oscillation, that is, the movement between two extreme positions.

[0010] This means that the weight and, consequently, the running length of the thread spools, apart from the material-related density parameters which can be disregarded here, can essentially only be influenced by the spool diameter.

[0011] The standardized empty cores and yarn spools limit the length of the yarn spools in subsequent processing steps. Increasing the yarn spool diameter is not practical, as the creels used in downstream processing are limited to a maximum diameter of approximately 400 mm. Increasing the winding density of the yarn spools to increase the length is also impractical for quality reasons, as increasing the winding density negatively affects not only the yarn properties, such as the crimp of the wound thread, but also the unwinding behavior of the thread from the spool.

[0012] This means that the demand of the processing industry for longer running lengths of the twisted yarn spools cannot be met without costly design and conversion measures within the processing machines.

[0013] From publication DE 10 2007 043 352 A1, a method for operating a cabling machine is known in which the feed spool mounted on the spindle has half the weight of the winding spool to be produced. The aim here is to reduce residual yarn, but not to increase the running length by increasing the changeover stroke.

[0014] DE 42 20 188 A1 discloses a spooling process in which the changing width of a changing roller can be varied by means of a limiting guide in order to produce coils with different winding widths. Adjusting the coil length or the changing stroke to maximize the running length for a given coil diameter is not addressed here.

[0015] The subject of DE 30 28 316 A1 is a special feed roller that reduces the thread tension force during winding in order to produce loose thread windings that are particularly suitable for winding dyeing.

[0016] DE 10 2015 014 299 A1 describes an external thread brake that is coupled to the thread guide channel to securely hold the thread in the event of a thread breakage and to prevent it from being pulled out of the spindle area.

[0017] German patent application DE 10 2014 002 882 A1 discloses a working station of a double-wire twisting machine. For winding onto the take-up bobbin, the yarn is guided over a wrapping roller to a leading roller. At the leading roller, the yarn tension is reduced to a level suitable for winding. The yarn then runs into a yarn changing device, designed here as a changing yarn guide, which guides the yarn transversely to a take-up bobbin or twisting bobbin to be wound onto, specifically a cross-wound bobbin. The cross-wound bobbin is driven by friction via a friction roller. The leading rollers and the friction rollers of the working stations are each arranged on a separate, machine-length drive shaft.

[0018] A first aspect of the invention therefore relates to a working station of a double-wire twisting or cabling machine for the production of carpet yarn, comprising a winding device which has a spool frame with two frame arms for rotatably supporting an empty spool or twisted spool, a spool drive roller for frictionally driving the twisted spool, a thread changing device for alternately laying a thread onto the twisted spool, a pre-lead roller for regulating thread tension and a cover in the area of ​​the pre-lead roller with a recess for the thread guided by the thread changing device to the twisted spool.

[0019] The proposed workstation is characterized by the fact that the spool frame has at least one movable frame arm with limited rotatability and is designed in such a way that an empty sleeve with a length of at least 315 mm can be inserted, that the spool drive roller has a length of at least 286 mm, that the thread changing device performs a changing stroke of at least 279.4 mm (11 inches), and that the recess in the cover corresponds to the thread path created by the changing stroke.

[0020] A workstation trained in this way enables the production of yarn spools for carpet yarns with increased running length. Increased spool length not only means longer processing times for the wiring and twisting processes themselves, but also longer processing times in subsequent finishing processes. This reduces the need for interruptions, such as those required for yarn change intervals.

[0021] While maintaining the standardized inner diameter of the empty spools for carpet yarn and the maximum possible twisted spool diameter, the twisted spools in the carpet yarn production process chain and their further processing are significantly increased in terms of setup format and setup quantity, without having to make technical and / or design changes in the process stages following the double-wire twisting or cabling machine.

[0022] To enable the rotatable mounting of longer empty cores, both the spool frame of the double-wire twisting or cabling machine and the spool drive roller must be modified accordingly. The recess in the cover, through which the thread to be wound is guided to the changing thread guide, is adapted to the changing stroke so that the thread is guided to the cover in a changing motion without contact. The recess must not be too large, as this would negatively affect, for example, the contamination of the machine parts located under the cover. Therefore, the recess must be adapted accordingly for a specific changing stroke. If the thread is laid onto the twisting spool with a changing stroke of 279.4 mm (11 inches), this results in a 10% increase in running length for subsequent processes.

[0023] Within the scope of the invention, it is conceivable that a conventional spool pot or a so-called energy-saving pot, also known, is used at such a workstation. In such an energy-saving pot, compared to cylindrical spool pots, the lower part of the pot approximates the natural curve of the thread balloon, and the thread balloon rotates closer to the spool pot. This results in an overall smaller thread balloon diameter, which translates into a significantly reduced energy consumption for operating the workstation.

[0024] In an advantageous embodiment, an empty sleeve with a length of at least 340 mm can be stored in the coil frame and the changeover stroke is 304.8 mm (12 inches).

[0025] By using a changing stroke of 304.8 mm (12 inches) on an empty core of at least 340 mm length, 20% more thread can be wound onto the thread spool than was previously possible on the standard empty cores and a changing stroke of 254 mm (10 inches) while adhering to the maximum diameter for the thread spool of 400 mm.

[0026] Alternatively, an empty sleeve with a length of at least 365 mm can be stored in the coil frame and the changing stroke is 330.2 mm (13 inches).

[0027] On such an empty tube, a changeover stroke of 330.2 mm (13 inches) can increase the running length of the thread on the thread spool by 30%.

[0028] A second aspect of the invention therefore relates to a double-wire twisting or cabling machine comprising a winding device, which has a spool frame with two frame arms for rotatably holding an empty sleeve or thread spool, a spool drive roller for frictionally driving the thread spool, a thread changing device for alternately laying a thread onto the thread spool, a pre-roller for regulating thread tension, and a cover in the area of ​​the pre-roller with a recess for the thread guided by the thread changing device to the thread spool.

[0029] The proposed double-wire twisting or cabling machine is characterized in that the double-wire twisting or cabling machine has at least one working station which is designed according to one of the embodiments described above.

[0030] With a double-wire twisting or cabling machine designed in this way, yarn spools can be produced that contain more yarn compared to conventional and standardized yarn spools. The resulting longer process times for the double-wire twisting or cabling processes not only increase efficiency but also have a positive impact on the energy balance of the machine, due to the less frequent necessary changes of the feed spools and the yarn spool. This means the machine needs to be started up from standstill less often.

[0031] The increased running length on the yarn spools also has a particularly positive effect on subsequent processing steps, whose processing times are also increased. Longer running times also mean fewer interruptions for manual spool changes, ultimately reducing the workload for the operating personnel.

[0032] A third aspect of the invention relates to a method for operating a double-wire twisting or cabling machine comprising a winding device, with a spool frame having two frame arms for rotatably holding an empty sleeve or thread spool, a spool drive roller for frictionally driving the thread spool, a thread changing device for alternately laying a thread onto the thread spool, a pre-roller for regulating thread tension, and a cover in the area of ​​the pre-roller with a recess for the thread guided by the thread changing device to the thread spool.

[0033] To increase the thread bobbin length by 10%, the thread changer must be capable of a change stroke of 279.4 mm (11 inches). For a 20% increase, a change stroke of 304.8 mm (12 inches) is required, and for a 30% increase, a change stroke of 330.2 mm (13 inches) is necessary. The length of the spool must be selected according to the change stroke. In addition to the thread changer, the bobbin frame, the bobbin drive roller, and the cover with the recess for the changing thread must be designed to allow for rotatable mounting, driving, and thread routing of this length format.

[0034] To further optimize the double-wire twisting and cabling process on a double-wire twisting or cabling machine for producing a yarn spool, it is conceivable within the scope of the invention to combine the increased changeover stroke with a processing ratio of 1:1 between the two feed spools. This means that, in the cabling process, both the feed spool mounted in the creel and the feed spool positioned in the spool pot are coordinated so that they have the same running length. In the case of the double-wire twisting process, both feed spools can also be arranged in the spool pot. The essential point is that one or more complete yarn spools are produced by completely processing the feed spools.

[0035] The lengths of the feed spools correspond either to half or to an integer multiple of the yarn spool to be produced. This reduces manual intervention, further optimizes process run times, and prevents the formation of leftover spools.

[0036] Another possible option is to combine the increased changeover stroke with a spool pot whose dimensions are optimized for the diameter of the feed spool to ensure the best possible volume utilization. This allows the corresponding machine elements, such as the spindle and the spool pot, to be designed to minimize energy consumption. This can be achieved, for example, with a so-called energy-saving spool pot, whose lower section is tapered, thus enabling the use of a spindle with a smaller diameter.

[0037] These methods enable the production of yarn spools with increased running length. This has a positive effect not only on the double-wire twisting and cabling process itself, but also on subsequent processing steps. This is particularly true because the advantages of longer processing times in downstream processing can be achieved without complex machine modifications. Both the mounting templates and the actual processing textile machines can continue to be used with the standardized dimensions for the new yarn spools.

[0038] Further features and advantages of the invention will become apparent from the following description of preferred embodiments of the invention, with reference to the figures and drawings that show essential details of the invention, and from the claims. The individual features can be implemented individually or in any combination in a preferred embodiment of the invention.

[0039] Preferred embodiments of the invention are explained in more detail below with reference to the accompanying drawings. Fig. 1 a schematic cross-sectional view of a cabling machine; Fig. 2 a schematic view of a winding device.

[0040] In Fig. Figure 1 shows a schematic cross-sectional view of a cabling machine 1, which has a plurality of work stations 2 arranged side by side in the longitudinal direction of the machine. Each work station 2 comprises a cabling spindle 3 with a bobbin case 8 and a driven thread storage disk 9 arranged below the bobbin case 8. A thread brake 4 and a balloon guide 5 are arranged above the cabling spindle 3. The bobbin case 8 serves to hold a first feed bobbin 6, from which an inner thread 7 is unwound overhead. The inner thread 7 of the first feed bobbin 6 is guided via the thread brake 4 to the balloon guide 5.

[0041] Each work station 2 has a mounting device for feed coils, a so-called coil gate 12, located outside the coil pot 8, which is designed to accommodate at least one second feed coil 13.

[0042] For this purpose, the creel 12 in this embodiment has several mandrels 14. An outer thread 15 is drawn off from a second feed spool 13 located on the creel 12 and guided axially from below through the hollow axis of the winding spindle 3. The outer thread 15 coming from the second feed spool 13 is deflected radially and exits the hollow axis of the winding spindle 3 at the thread storage disk 9 below the first feed spool 6. The thread storage disk 9 is set into rotation by the winding spindle 3. The outer thread 15 exiting the thread storage disk 9 rotates around the bobbin case 8 and is guided through the balloon guide 5. The inner thread 7 and outer thread 15, joined in the balloon guide 5, form a wound double thread, as the outer thread 15 coming from the second feed spool 13 winds around the inner thread 7 drawn off from the first feed spool 6.The resulting double thread is fed to a winding device 11 and wound onto a winding or twisting spool 16.

[0043] To produce a thread bobbin 16 with a diameter of 400 mm, two feed bobbins 6 and 13 are used. The first feed bobbin 6 is placed in the bobbin case 8, and the second feed bobbin 13 is placed on a mandrel 14 of the creel 12. The unwinding process of the two feed bobbins 6 and 13 ends when the predetermined finished diameter of the thread bobbin 16 is reached.

[0044] At the time of completion, yarn has been unwound equally from the two feed bobbins 6 and 13, so that in this embodiment both feed bobbins are approximately half unwound. The thread bobbin 16 is removed and a new empty spool is clamped in place. For this, the bobbin frame 17 must be manually lifted so that the thread bobbin 16 is lifted from the bobbin drive roller 19. To allow for greater ease of movement, the bobbin frame 17 can be gripped on both sides, i.e., on each frame arm, and pivoted into an upper locking position. A new thread bobbin 16 is then produced.

[0045] The feed spools can alternatively contain half the amount of thread required for the yarn spool 16 to be produced. Such alternative feed spools are marked with reference numbers 13.1 and 13.2. In this case, at the time yarn spool 16 is completed, both feed spools 6 and 13.1 or 13.2 are completely unwound, except for a small amount of thread. The unwound feed spools 6 and 13.1 or 13.2 are then replaced with new ones.

[0046] Fig.Figure 2 schematically shows the winding device 11 of a workstation 2. The movably spring-mounted spool frame 17 is designed such that an empty core 18 with a length of 340 mm can be rotatably mounted. The calibrated thread is wound onto the empty core 18 to produce the thread spool 16. For this purpose, the empty core 18 is driven by friction via a spool drive roller 19. The thread changer 20, designed in this embodiment as a thread guide 24, is configured to perform a change stroke of 304.8 mm (12 inches).

[0047] A pre-roller 23, concealed by the cover 21, regulates the thread tension of the thread to be wound onto the spool 16. The thread is guided to the thread guide 24 through the cover 21, which has a recess 22 for this purpose.

[0048] The dashed line represents the idealized, straight path of the thread to the thread guide 24 in its far right position. Similarly, the equally idealized path of the thread to the thread guide 24 in its far left position is also shown. This means that the two thread guides depicted are not separate components; rather, the same thread guide 24 is shown in its two extreme positions, completing a changeover stroke of 304.8 mm (12 inches) between them to produce a thread spool 16 with a 20% greater running length. Reference symbol list 1 cabling machine 2 jobs 3 cable spindles 4 thread brake 5 balloon pilots 6 First feed spool 7 inner thread 8 coil pot 9 Thread storage disc 11 Winding device 12 coil gates 13 Second feed spool 13.1 Alternative feed spool 13.2 Alternative feed spool 14 Dorn 15 Outer thread 16 thread spools 17 spool frames 18 Empty sleeve 19 Spool drive roller 20 Thread changing device 21 Cover 22 recess 23 Advantage roll 24 thread guides

Claims

[1] Working station (2) of a double-wire twisting or cabling machine (1) for the production of carpet yarn, comprising a winding device (11) comprising a spool frame (17) with two frame arms for rotatably supporting an empty spool (18) or twisted spool (16), a spool drive roller (19) for frictionally driving the twisted spool (16), a thread changing device (20) for alternately laying a thread onto the twisted spool (16), a pre-roller (23) for regulating thread tension, and a cover (21) in the area of ​​the pre-roller (23) with a recess (22) for the thread guided by the thread changing device (20) to the twisted spool (16), characterized by , that the coil frame (17) has at least one movable frame arm mounted with limited rotatability and is designed in such a way that an empty sleeve (18) with a length of at least 315 mm can be inserted, that the spool drive roller (19) has a length of at least 286 mm, that the thread changing device (20) performs a changing stroke of at least 279.4 mm (11 inches), and that the recess (22) in the cover (21) corresponds to the thread path created by the changing stroke. [2] Workplace (2) of a double wire twisting or cabling machine (1) according to claim 1, characterized by , that an empty sleeve (18) with a length of at least 340 mm can be stored in the coil frame (17) and the changeover stroke is 304.8 mm (12 inches). [3] Workplace (2) of a double wire twisting or cabling machine (1) according to claim 1, characterized by , that an empty sleeve (18) with a length of at least 365 mm can be stored in the coil frame (17) and the changeover stroke is 330.2 mm (13 inches). [4] Double-wire twisting or cabling machine (1) comprising a winding device (11) comprising a spool frame (17) with two frame arms for rotatably supporting an empty core (18) or thread spool (16), a spool drive roller (19) for frictionally driving the thread spool (16), a thread changing device (20) for alternately laying a thread onto the thread spool (16), a pre-roller (23) for regulating thread tension, and a cover (21) in the area of ​​the pre-roller (23) with a recess (22) for the thread guided by the thread changing device (20) to the thread spool (16), characterized by , that the double wire twisting or cabling machine (1) has at least one working station (2) which is designed according to one of the preceding claims. [5] Method for operating a double-wire twisting or cabling machine (1) comprising a winding device (11) with a spool frame (17) having two frame arms for rotatably supporting an empty core (18) or thread spool (16), a spool drive roller (19) for frictionally driving the thread spool (16), a thread changing device (20) for alternately laying a thread onto the thread spool (16), a lead roller (23) for regulating thread tension, and a cover (21) in the area of ​​the lead roller (23) with a recess (22) for the thread guided by the thread changing device (20) to the thread spool (16), characterized by , that an empty sleeve (18) with a length of at least 315 mm is inserted into the coil frame (17), and the thread is laid with a changeover stroke of at least 279.4 mm (11 inches).

Images