Twisting machine with replaceable spool carrier

Abstract

The invention provides a twisting machine with internal pay-off of metal filaments (preferably steel wires). The twisting machine is provided with a spool carrier which can be replaced as a whole without having to load full spools or separately remove empty spools. The carrier has all auxiliary means on a plate for appropriate wire path control, wire shaft axes, and tension control systems. The carrier is mounted on a bridge that remains stationary between the first rotor and the second rotor. The carrier is provided with a lock which ensures safe removal and locking of the carrier. The invention also extends to a working method for an operator. According to the invention, the working condition of an operator is greatly improved by enabling the operator to easily get close to the bobbin from the outside of the twisting machine main body.

Description

Technical Field

[0001] The invention relates to a twisting machine with an internal pay-off bobbin, more specifically to a cable-forming machine, more specifically to a machine for twisting steel wires with each other. The machine is particularly used for producing steel cords. The machine has an easily replaceable bobbin carrier. The carrier replaces the traditional bobbin holder. Background Art

[0002] Twisting machines such as beamers or cabling machines are used to twist the filaments with each other to produce a cord. In order to do this in an efficient manner, the bobbins with the filaments are mounted on one or more fixed supports and the wires are rotatably guided on the bobbins by means of drums or flywheel rings, while the twisted filaments are pulled by means of capstans.

[0003] In the case of cabling, one turn of the drum or flywheel ring combines with drawing the filaments to produce a single twist of the desired lay length. The lay length in meters is the ratio of the linear speed (in meters per minute) to the angular speed (in turns per minute). The filaments are not twisted during the cabling process.

[0004] In the case of bundling, the filaments are twisted twice per rotation of the drum or flywheel ring, and the filaments themselves also twist once per twist pitch. Therefore, the bundling process is the preferred process because the productivity is in principle twice that of the cabling process.

[0005] Therefore, the cord manufacturing process includes a lot of bobbin handling and threading the filaments through the twisting machine. When the machine is already loaded, the threading work can be reduced by connecting (for example by tying a knot) the end of the previously loaded filament to the beginning of the newly loaded full bobbin. Only if the machine must be threaded for the first time, the filaments must be threaded through the entire machine.

[0006] For example, for producing a 3+9+15 type cord, the cord is made by the following steps:

[0007] First the three spools are loaded into the twisting machine and then the resulting 3x1 core spool is dropped.

[0008] Next, the 3×1 core bobbin is loaded into the outer position of the subsequent twisting machine, which is loaded with 9 inner bobbins and 9 filaments are wound around the 3×1 core bobbin.

[0009] Twist, thus producing 3+9 wound on the core bobbin;

[0010] Next the 3+9 core bobbin is loaded into the outer position of the subsequent twisting machine which is loaded with 15 inner bobbins and twists the 15 filaments around the 3+9 core bobbin to obtain a 3+9+15 cord.

[0011] In this simple example, 29 spool loadings and 3 spool drop actions are already required.

[0012] Since the spools are heavy and large, threading and loading the machine is a tedious and laborious action. Furthermore, care is required when threading the machine, as the wire path must be fully observed in order to avoid getting a defective product, for example by exchanging filaments. Furthermore, in order to save space for the filament spools - larger filament spools run longer and are therefore more efficient - the remaining space for the wire path is reduced, and it becomes more difficult to thread the filament through the narrow passage between the spools.

[0013] Publication GB 1343471 describes a system for increasing the productivity of loading by mounting two or more spools on a carrier that is locked to a stand. The proposed device is simple and straightforward, but lacks essential features and is also unsafe in use.

[0014] The inventors have further developed this basic concept which has resulted in a functioning and safe twisting machine which will be described hereinafter. Summary of the invention

[0015] The main purpose of the present invention is to improve the ergonomics and safety of the bobbin loading of a twisting machine. To this end, the present invention discloses an apparatus (twisting machine) and a method for operating the twisting machine. Another purpose of the apparatus is to improve the productivity and normal operation time of the twisting machine.

[0016] According to a first aspect of the present invention, a twisting machine as claimed in the preamble of claim 1 is provided.

[0017] The twisting machine has an internal payoff of the filaments, which means that the filament bobbins are stored in a space defined by the drum, flywheel ring or filaments, and the filaments are moved outside this space during the cord production process. The cord is wound on a bobbin outside this space. This is in contrast to an outside-in or inside buncher, in which the cord is wound on an internal take-up bobbin inside the space defined by the rotating filaments of the flywheel ring.

[0018] The twisting machine includes a bridge rotatably mounted between the first rotor and the second rotor. The first rotor and the second rotor are coaxially mounted and driven by a motor in the same direction and at the same speed, and define a rotor axis. The first rotor and the second rotor may be connected by a drum or flywheel ring, which is used to guide the filament from the first rotor to the second rotor. Alternatively, also referred to as a twisting machine without a flywheel ring, the first rotor and the second rotor may include a filament guide that keeps the filament away from the bridge when the filament rotates and moves from the first rotor to the second rotor unsupported. The bridge is connected between the first rotor and the second rotor, but since the bridge is rotatably mounted to the first rotor and the second rotor, the bridge remains stationary during the operation of the twisting machine. The bridge is heavy enough to remain in a lower position by gravity when the rotors rotate.

[0019] The twisting machine also includes a carrier for mounting the pay-off bobbin thereon. The carrier can be mounted on and detached from the bridge. The bridge holds and supports the carrier.

[0020] The carrier is provided with all necessary auxiliary devices to dynamically unwind the spool and guide and handle the filaments. Therefore, the carrier is provided with a spool mandrel or axle rod for unwinding the spool, a path control device for guiding the wire through the carrier, and a tension control system for controlling the tension of the filaments delivered from the spool. As required, the carrier can be equipped with two or more (e.g., three, four, possibly up to fifteen or more) mandrels. Alternatively, the carrier can be equipped with a single mandrel. A single mandrel carrying a spool of filaments with two or more parallel windings can produce cords.

[0021] The wire path control device may be, for example but not exclusively, a pay-off roller, a deflection pulley, a brake pulley, a wire separating pulley, a distribution disc, a preformer or equivalent.

[0022] The pay-off roller is a roller mounted parallel to the spool axis and extending over at least a portion of the winding width of the filament or the entire winding width. It is used to unwind the wire uniformly from the spool.

[0023] A deflection pulley can be used to guide the filament wire through the carrier. A brake pulley is also present on the tensioning arm of the pendulum brake, where it interacts with the deflection pulley to actuate the pendulum-actuated brake. The deflection pulley remains fixed to the carrier and the brake pulley is mounted on and moves with the brake lever. When using a spool carrying two or more filaments wound in parallel, a wire separation pulley can be introduced into the wire path. The wire separation pulley is used to separate tightly wound filaments.

[0024] The distribution plate helps to position the individual filaments before they enter the assembly point. The preformer is a device that applies a degree of curvature to the filaments. Combined with rotating the filaments, this results in the filaments having the correct helical shape before entering the cabling die. The cabling die is the assembly point where all the filaments meet and are held together before being twisted together.

[0025] The tension control system includes a pendulum-actuated brake, a brake disc, a brake rod, a tension spring, a brake band or a brake chain. The brake disc can rotate and is fixedly connected to the rotating wire spool. The brake band or brake chain is tensioned on the brake disc by a tension spring. The brake band has a single contact area shared with the brake disc, and the brake chain has a periodically spaced brake block including multiple areas in contact with the brake disc. The other end of the brake band or brake chain is connected to the shorter arm of the rod. The rod rotates around the fulcrum attached to the carrier. The longer arm of the rod is connected to the brake pulley. The pendulum-actuated brake adjusts the braking torque applied to the brake disc by sensing the tension on the filament loop, which is wound from the deflection pulley to the brake pulley by applying more or less tension on the brake band or brake chain. It is possible that one, two or more loops can be formed between the brake pulley and the deflection pulley, thereby increasing the braking torque by utilizing the pulley block effect.

[0026] According to a preferred embodiment of the invention, the number of spool spindles on the carrier below the horizontal plane including the axis of the rotor is one or more greater than the number of spool spindles on the carrier above the horizontal plane. For example, there may be 2 spindles above the horizontal plane and 3 spindles below the horizontal plane, or there may be 2 spindles above the horizontal plane and 4 spindles below the horizontal plane. This is independent of whether the carrier is oriented horizontally or vertically during operation: it is not important. This arrangement ensures that the carrier has a sufficiently low center of gravity so that a safe positioning of a fully loaded carrier or a safe removal of an empty carrier always has a sufficiently low center of gravity. However, for ease of transport, loading and unloading, the carrier is preferably mounted vertically.

[0027] According to another preferred embodiment of the present invention, the carrier is composed of a base plate and a first auxiliary plate and a second auxiliary plate, and the first auxiliary plate and the second auxiliary plate are used to mount at least a part of the path control device or the tension device thereon. These plates are symmetrically mounted to the sides (left and right) of the base plate and cover a part of the base plate. Preferably, the carrier is mounted vertically, and the first auxiliary plate and the second auxiliary plate help to maintain a low center of gravity.

[0028] According to another preferred embodiment of the present invention, the carrier is provided with a first shoulder and a second shoulder. The shoulders are located in the peripheral area of ​​the carrier. The bridge is provided with a first recess and a second recess, wherein when the carrier is installed in the twisting device, the associated first shoulder and second shoulder cooperate, are received, are carried, and are held. The first recess and the second recess are positioned close to the first rotor and the second rotor. The centers of the first rotor and the second rotor share the same axis. The distance from the first rotor to the second rotor along the axis will be referred to as the 'bridge span'. In case of dispute: the bridge span is taken between the races of the bearings of the first rotor and the second rotor that are closest to each other. The races of these closest bearings are the reference points for any distance along the axis hereinafter.

[0029] The axial distance between the first rotor and the first recess, i.e. the distance perpendicular to the rotor axis, must be less than one third of the span of the bridge. More preferably, this axial distance is less than one quarter, one fifth or even one tenth of the span of the bridge. For reference, the axial distance between the second rotor and the second recess must be less than one third, one quarter, one fifth or even one tenth of the span of the bridge. For the avoidance of doubt: the axial distance between the first rotor and the first recess does not necessarily have to be equal to the axial distance between the second rotor and the second recess, although equality is more preferred for reasons of symmetry. For the avoidance of doubt: since the recess will of course have some axial extension, the shortest possible axial distance between the reference point of the rotor and the recess will be considered.

[0030] The inventors have found that by placing the carrier at these recesses, the bearing loads on the rotor are lower. Counterintuitively, a person skilled in the art would carry the carrier in the middle of the bridge. However, the latter option is not the optimal position.

[0031] In another preferred embodiment, the first and second recesses receive the first and second shoulders in the form of a slope, the slope or ramp being oriented towards the first rotor or the second rotor. In other words: the bottom of the recess rises towards the rotor. The angle of the slope or ramp is between 15° and 75°, or even between 20° and 70°, for example 45°. The inclined surface has the advantageous feature that the shoulders exert a force outward from the machine, towards the rotor. This force helps to compensate for the force exerted on the rotor by, for example, a flywheel ring tending to pull the rotors towards each other. In addition, the slope helps to center the carrier when it is loaded into the twisting machine.

[0032] In another preferred embodiment, the carrier comprises one, two or more locks, the lock comprising a lock body and a locking bolt having a corresponding key rod. The locking bolt slides in the lock body. The locking bolt engages, slides into, and locks into a locking bolt receiving hole or a lock hole on the bridge. When the twister is working, the locking bolt locks the carrier to the bridge. When the carrier is not locked to the bridge, the key rod must be in the locking bolt. The presence of the key rod is a clear indication to the operator that the carrier is in its unlocked position. When the key rod is present, the flywheel ring, drum or filament balloon cannot pass because the key rod obstructs the path of the flywheel ring, drum or filament balloon. The key rod can only be removed when the carrier is locked to the bridge.

[0033] It is preferred to have two locks: one on either side of the carrier. This adds extra redundancy as the carrier will not easily disengage from the bridge. Possibly, there could be three or four locks.

[0034] In a preferred embodiment, when the locking bolt is in the first position, the key bar is received by the locking bolt. Only in this way can the locking bolt be moved to the second position by the key bar. When the locking bolt is in the second position, the key bar cannot be removed. Only when the key bar is put back in the first position can it be removed. In the second position, the locking bolt is held in place by the key bar. The first position of the locking bolt corresponds to the situation where the carrier is locked to the bridge. The second position of the locking bolt is the situation where the carrier is released, unlocked from the bridge. The carrier can then be removed from the twisting machine.

[0035] When the twisting machine is working, the locking bolt must be firmly held, engaged in the keyhole, i.e. in the first position. That is, when the key bar is removed. This can be achieved in a variety of ways. The locking bolt can be pushed into place by a mechanical spring, which pushes the locking bolt into the keyhole. In an alternative embodiment, the locking bolt can be pushed into place by an air spring. In another embodiment, it is possible that, in combination with a mechanical or pneumatic spring, the locking bolt can be held in place by a magnet located at the bottom of the keyhole.

[0036] In another preferred embodiment, the carrier is provided with hooks or lifting eyes to lift the carrier off the machine.

[0037] The particularly preferred embodiment of the twisting device is a steel wire twisting machine. In the steel wire twisting machine, the bobbin itself is very heavy. Therefore, these bobbin can not be operated by hand, and a lifting device is required. Especially in such machines, the method provided by the invention can help reduce the loading time and improve ergonomics.

[0038] The twisting machine is preferably a bundler. A bundler twists all the wires together by twisting. Alternatively, the twisting machine can be a cabling machine. Here, the filaments from the spools will form a bundle of untwisted filaments.

[0039] According to a second aspect of the present invention, there is provided a method for loading and unloading a twisting machine as described above. The method uses the carrier described above.

[0040] First, an empty carrier is provided outside the twisting machine. The carrier may be in a waiting position or may be taken from an empty twisting machine. The empty carrier may be a carrier without a wire spool or may be a carrier with an empty spool, i.e., there may be a small amount of residual wire filaments on the spool. The carrier may be positioned on a suitable stand in a vertical or horizontal position or any angle therebetween (for easy access).

[0041] Full bobbins are loaded on the carrier. This is easy when the carrier has no bobbins. When there is still an empty bobbin on the mandrel, the empty bobbin must be removed. Possibly, the filament end from the empty bobbin can be connected to the filament end of the full bobbin. A full bobbin may contain one filament. Alternatively, a full bobbin may contain two, three, four or more filaments wound in parallel. Therefore, for one single bobbin, multiple filament lengths can be loaded. Subsequently, the filaments are threaded through the wire path of the carrier, following the wire path control device. When all the filaments are correctly threaded, they are collected at an assembly point (i.e., a cabling mold). The filament bundle leaves the cabling mold. The key rod is placed in the locking bolt and set to the second position. This all occurs outside the twisting machine.

[0042] The threaded carrier can be transported (possibly by an automatic transport vehicle) to the vicinity of the twisting machine. It is then installed in the empty twisting machine. The carrier is locked to the bridge by means of a locking bolt set in a first position before the key bars can be removed. The key bars are stored in a dedicated location on the machine. An additional safety feature is that the twisting machine cannot be started unless all the key bars are identified, detected, sensed as present.

[0043] The filament bundle leaving the cabling die is connected to the remaining cord ends previously loaded. Alternatively, the filament bundle is threaded through the filament path as follows: through a drum or flywheel ring, and / or through a rotor. The splice is slowly moved through the twister. Once the splice is on the take-up spool, the splice is cut and the twister can be started.

[0044] The proposed method allows the carrier to be loaded and threaded in the best possible way:

[0045] The operator has free access to the carrier. In fact, the operator does not have to reach the machine

[0046] in and can simply walk around the carrier to thread;

[0047] It is easier for the operator to thread the machine because there is no flywheel ring or drum to further reduce the space for threading the machine. More space is available for hand threading of fine filaments;

[0049] Loading and unloading of spools can be done more efficiently with better lifting equipment. Less lifting equipment is needed because the carrier can be loaded in a concentrated space under suitable working conditions. Not every machine must have a hoist.

[0050] The pay-off tension can be adjusted outside the twisting machine, which increases the machine's uptime and the accuracy of the adjustment.

[0051] Full spools can be supplied more easily as they arrive in a centralized area and do not have to be brought to the machine. Empty spools are also collected in a centralized space.

[0052] The threaded carriers can be queued and delivered to the machine in a just-in-time manner.

[0053] The carrier can replace the many shipping pallets that are needed to transport the spools.

[0054] With this new way of working, intermediate transports can be reduced, the normal operation time of the twisting machine can be increased, but especially the working conditions for the operators can be greatly improved.

[0055] Preferably, the 'threading area' is located in a dedicated area between the area for stretching the filaments and the area where the twisting machines are present. This dedicated area can be easily air-conditioned, can be quiet, have good lighting, in short: better for working. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 An overview of a twisting machine according to the invention is shown.

[0057] Figure 2 A carrier and a bridge according to the invention are shown.

[0058] Figure 3 A perspective view of the locking bolt and key rod is shown.

[0059] Figure 4a , Figure 4b , Figure 4c Shows how the locking bolt works.

[0060] The hundreds digits of the reference numerals refer to the reference numerals. The same ones and tens digits in the various figures refer to the same elements. DETAILED DESCRIPTION

[0061] Figure 1A perspective view of a twisting machine 100 (in this case a cable bundle machine with a flywheel ring) in which the present invention is implemented is shown. The twisting machine has a housing 102 and two rotors 104, 104', which are connected by two symmetrically mounted flywheel rings 106 (one flywheel ring is not visible), and the flywheel ring 106 guides the filaments or cords from one rotor to another. The rotors 104, 104' are rotatably driven by a motor (not shown) and are carried by external bearings (not shown) in a manner known to those skilled in the art. A bridge (not shown) is rotatably mounted between the rotors 104, 104' by an internal bearing (not shown) located in the rotors 104, 104'. The twisting machine 100 has a filament bobbin 190 (only one is indicated) mounted inside, that is, the bobbin is located in the space defined by the rotating flywheel ring 106. Six bobbins can be accommodated in the machine: three in front of the carrier and three behind the carrier. The number of spindles below the horizontal plane passing through the rotor axis is 4, while the number of spindles above the horizontal plane is 2. This ensures that the center of gravity remains sufficiently low and the carrier remains stable during loading and unloading. The twisting machine is provided with known features, such as winding unit, control unit, motor, etc. These features are known to the person skilled in the art and are not described in detail in the drawings.

[0062] exist Figure 2 In the figure, an empty carrier 201 is shown in the upper part and a bridge 250 for receiving the carrier 201 is shown in the lower part. The carrier is provided with three mandrels 202, 202', 202" on one side. Since the plane of the carrier is vertical in this embodiment, three other mandrels (not visible) can be arranged in a mirror arrangement on the other side. There are therefore a total of six mandrels on which six spools can be mounted. If each of the six spools contains two filaments, the carrier allows unwinding twelve filaments in one load.

[0063] Obviously, this amount of filaments must be guided through the associated wire path control device. To this end, the carrier comprises six pay-off rollers, of which three pay-off rollers 208, 208', 208" are visible and three are located on the rear side of the carrier. These pay-off rollers 208, 208', 208" will ensure proper unwinding of the filaments over the width of the spool. The filaments travel over a plurality of deflection pulleys, one of which is indicated by 210, and form one or more loops between the deflection pulley 210 and the brake pulley 212.

[0064] Focus on the mandrel 202 at the front lower right, which is fixed to a brake disc 216, on which a brake chain 218 runs. The brake chain 218 is tensioned by a tension spring (not visible) and a rod 214 pulled by a tension pulley 212. The brake disc 216 rotates fixedly with the spool and applies tension on the filament as it is unwound. These elements form a tension control system that is integrally attached to the carrier. The system is constructed in the same manner for each other spool position on the carrier 201.

[0065] Finally, after being properly arranged by the distributor disk 220 and one or more preformers (not shown), the filament bundles converge into a cabling die held in a cabling die holder 222. The cabling die provides a fixed cabling point.

[0066] All these elements are fixed to a base plate 224 and to a first auxiliary plate 226 and a second auxiliary plate 226'. The first auxiliary plate 226 and the second auxiliary plate 226' are used to mount some diverting pulleys. These auxiliary plates 226, 226' also ensure that the carrier remains vertical during use. The base plate 224 of the carrier is also provided with a first shoulder 228 and a second shoulder. Only the first shoulder 228 is Figure 2 The carrier 201 is also provided with a lock 240 with an associated key bar. This will be discussed in further detail. The carrier 201 is also provided with two eyebolts 230, 230' for lifting the carrier away from the twisting machine 100.

[0067] The bridge 250 has two holes 252, 252' in which the internal bearings (not shown) are held. The bridge 250 has two legs 254, 254' and a heavy platform portion 256 for maintaining a low center of gravity. A first recess 258 and a second recess 258' are provided on the legs 254, 254' facing the holes 252, 252'. The first shoulder 228 engages with the first recess 258 and the second shoulder engages with the second recess 258'. 260 shows that the axis of the rotors 104, 104' is centered through the holes 252, 252'. The distance between the two rotors 104, 104' taken from the races of the internal bearings is the bridge span denoted as 'L'. The axial distance from the second recess 258' to the second rotor 104' denoted as 'M' is about 1 / 15 of the bridge span 'L'. The bridge 250 is also provided with two guides 262, 262' for guiding the carrier during installation.

[0068] Figure 3 The lock 340 is shown in detail. Figure 2, 240). Two such locks 240 are present on the carrier 201, one on each side of the carrier. The lock includes a locking bolt (not visible) that slides in a lock body 344 and engages with a locking bolt receiving hole 343. The locking bolt can be moved by a key rod 342, which will be referred to as Figure 4a , Figure 4b and Figure 4c Provide explanation.

[0069] When the carrier is mounted inside the twister, the locking bolt 446 is in the first position. The locking bolt 446 engages with the locking bolt receiving hole 443 in the side of the guide 462. The locking bolt 446 is held in its position by a coil spring 448 that pushes into the receiving hole. Alternatively, the spring 448 can be a pneumatic spring. Alternatively or even in addition to a mechanical spring, a pneumatic spring can be used. It is also helpful to provide a counter magnet in the guide 462 that pulls the locking bolt 446 into the receiving hole 443.

[0070] To remove the carrier, the operator must first remove the key rod 442 held in the holder of the twisting machine. The key rod 442 is inserted into the hole 450 in the locking bolt 446: Figure 4a The operator then pulls the locking bolt 446 out of the receiving hole 443 by overcoming the force of the spring 448: Figure 4b When the locking bolt 446 is in the second position 'open position', the key rod 442 is pushed further into the hole 449 in the lock body 444: Figure 4c The necking 447 in the key bar 442 passing in the narrowed slot 445 ensures that when the carrier is removed from the twister, the key bar cannot be accidentally removed from the lock 440. In order to place a new carrier into the twister, the actions must be performed in the reverse order.

[0071] The loading of the twisting machine is greatly simplified by using the removable carrier described herein. Instead of arranging the shuttle rack between the filament delivery section and the twisting section, the full filament bobbin can be directly installed, loaded on the carrier. Therefore, the present invention avoids loading the shuttle rack in the filament delivery section and unloading the shuttle rack in the twisting section. The carrier is then transported (possibly on an autonomous guided vehicle) to the threading area.

[0072] In the threading area, the operator threads the filaments through the carrier's wire path, toward and through the cabling die. The wires are connected together by knotting, swaging, welding, fusing, etc. This threading can be done in an air-conditioned environment, when the operator can walk around the carrier with enough room to reach all the spools.

[0073] The threaded carrier (possibly on an automated vehicle) is then placed in the twisting area close to the twister, from which the previously run empty carriers have been removed and stored in a waiting position. The threaded carrier is lifted and installed into the twister. The carrier is then locked in place. The threaded wire end is either further passed through the machine or connected to the remaining cord end. Once the cord is on the take-up spool, the splice is slowly moved through the machine and cut. The machine is started. The empty carrier from the previous load is then placed on the carrier and heads to the filament delivery area to collect the new load.

Claims

1. A twisting machine with internal payoff of filaments, the twisting machine comprising a bridge rotatably mounted between a first rotor and a second rotor, the first rotor and the second rotor defining a rotor axis, the twisting machine further comprising a carrier on which a payoff bobbin is mounted, the carrier being mountable on and removable from the bridge, wherein: The carrier includes a spool mandrel, a wire path control device and a tension control system integral to the carrier.

2. The yarn twisting machine according to claim 1, wherein: The wire path control device includes one or more selected from the group consisting of a pay-off roller, a deflection pulley, a brake pulley, a distribution disk, a preformer and a cabling mold, and the tension control system includes one or more selected from the group consisting of a pendulum-actuated brake, a brake disc, a brake rod, a tension spring, a brake band or a brake chain.

3. The yarn twisting machine according to claim 1 or 2, wherein: The number of bobbin mandrels on the carrier below a horizontal plane including the rotor axis is one or more greater than the number of bobbin mandrels on the carrier above the horizontal plane including the rotor axis.

4. The twisting machine according to any one of claims 1 to 3, wherein The carrier is provided with a first shoulder and a second shoulder, and the bridge is provided with a first recess and a second recess, wherein the first recess and the second recess are used to receive the first shoulder and the second shoulder when the carrier is installed in the twisting machine, wherein the axial distance between the first recess and the first rotor and the axial distance between the second recess and the second rotor are both less than one-third of the span of the bridge, and the span of the bridge is the axial distance from the first rotor to the second rotor.

5. The yarn twisting machine according to claim 4, wherein: The first recess and the second recess receive the first shoulder and the second shoulder in an inclined manner, and the inclined surface faces the first rotor or the second rotor.

6. The twisting machine according to any one of claims 1 to 5, wherein The carrier further comprises one, two or more locks with corresponding key bars, the lock comprising a lock body and a locking bolt sliding in the lock body, the locking bolt being adapted to engage in a locking bolt receiving hole on the bridge, wherein the key bars are present when the carrier is unlocked from the bridge, and wherein the key bars are removed when the carrier is locked to the bridge.

7. The yarn twisting machine according to claim 6, wherein: The key rod is received by the locking bolt when the locking bolt is in a first position, and the locking bolt can be moved to a second position by the key rod, in which the key rod cannot be removed from the locking bolt, the first position corresponding to the carrier being locked to the bridge, and the second position corresponding to the carrier being unlocked from the bridge.

8. The yarn twisting machine according to claim 5 or 7, wherein: The locking bolt is held in the first position by a mechanical, magnetic or pneumatic spring.

9. The twisting machine according to any one of claims 1 to 8, wherein The twisting machine is a steel wire twisting machine.

10. The yarn twisting machine according to claim 9, wherein: The twisting machine is a cable-bundling machine or a cabling machine.

11. A method for loading a twisting machine according to any one of claims 1 to 10, comprising the following steps: a) providing an empty vector; b) loading full bobbins onto the empty carrier, each of the full bobbins comprising one or more filaments; c) threading the filaments through a wire path of the carrier to obtain a threaded carrier, wherein all filaments terminate at one assembly point; d) installing the threading carrier into the twisting machine; e) locking the carrier to the bridge; f) continuing to thread the twisting machine from the assembly point; in The steps b) and c) are carried out outside the twisting machine.

12. The method according to claim 11, wherein: In the case where the twisting machine is pre-threaded, step f) is replaced by f') Connecting the filaments at an assembly point to the remaining cord ends previously loaded.

13. The method according to claim 11 or 12, wherein: The twisting machine is a bundled machine and at least one of the spools comprises two or more filaments.

14. The method according to any one of claims 11 to 13, wherein: The steps a), b) and c) are carried out in a dedicated area, which is away from the area of ​​the twisting machine.

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