JPH0138563B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire withdrawal brake device for a high-speed stranded wire machine that is disposed inside a rotating member of a bobbin frame and operates depending on the tension of the wire.

In its simplest form, the known bobbin brake consists of a brake disc which is non-rotatably connected to the drawer bobbin, either by a brake band or by a shoe brake. It is adapted to be braked to the extent that a certain defined force has to be applied to the withdrawal of the rolled article. However, this embodiment has the disadvantage that as the diameter of the winding becomes smaller, the pull-out force required to overcome the braking moment becomes increasingly large. For drawer bobbins of tubeless stranded wire machines, this type of brake is not sufficient. This is because in this case the stranded article must be drawn out with a drawing force that remains approximately constant in order to produce a stranded article of adequate quality.

Braking devices for unwinding bobbins of stranding machines are also known, in which the braking moment is influenced by the tension acting in each case in the stranded articles. This braking device consists of a strategic arrangement of a fixed deflection roll and a movable deflection roll, over which the twisted articles are guided. In this case, the movable deflection roll is arranged on a spring-loaded brake lever, via which the return bobbin can be made stronger or weaker depending on the respective tension in the stranded article. Braked. With such a braking device it is possible to reduce the excess of the set braking moment to less than 30%.

In modern high-power, high-speed stranding machines of tubeless construction, the stranded article drawn from the drawer bobbin, in operating conditions, usually
It is guided through the rotor in the form of a sinusoidal flight curve. In this case, the article must move almost frictionlessly through the wire guiding elements that are present. However, this means that the braking force on the drawer bobbin required to maintain the flight curve remains approximately constant over the entire twisting process, independent of its filling degree in each case. Sometimes it's just possible.

A braking device for a drawer bobbin of a tubeless stranding machine which substantially satisfies this requirement is known from DE 21 64 131. The wire control device is shown in Figures 8A, B and C thereof, and is described on pages 13-16. It consists of an assembly fixed to the bobbin frame, which extends in front of the bobbin and whose ends are curved so as to be generally centered in the width of the bobbin. A one-armed control lever is pivotably mounted on the assembly part, the free end of which is split into two arms. A wire guide bush is arranged in the arm of the control lever facing the drawer bobbin, and a guide roll is arranged in the other arm lying behind it in the drawer direction. A coil spring applies force to the control lever in the pulling direction, and when the machine is in operation,
It presses the assembly part elastically. In the assembly part, lying slightly deeper than the guide roll, another wire guide roll is journalled on the control lever. A brake disc is non-rotatably connected to the drawer bobbin, and a brake wire is placed on the brake disc. One end of the brake wire is secured to the control lever and the other end to the assembly part. The fixation of the ends of the brake wires is adapted to allow coarse and fine adjustment of the braking force. This wire tension adjustment device must ensure a constant braking force that corresponds to the adjustment value. This wire tension control device takes into account the wire tension immediately behind the drawer bobbin, but it has little effect on other magnitudes of tension in the course of the wire guide through the entire length of the rotor. I don't have it. A special feature of high-power, high-speed stranding machines of tubeless construction, in particular those with a higher number of bobbins, is that, in the starting phase or braking phase, a higher number of draw-out bobbins is As a result, friction-free guidance of the stranded article is not possible when frequent and significant turning of the stranded article takes place. However, on the other hand, in driving conditions relatively high braking forces are used for the maintenance of the required flight curve, which must not exceed a certain flight circle, so that the previously explained Integration of a wire tension control device is not possible. This is because this device either causes the flight circle of the twisted article to grow beyond the allowable amount or increases the tensile stress within the twisted product.
This is because it can be made too high during the starting and braking phases, thereby causing the stranded article to break.

SUMMARY OF THE INVENTION It is an object of the present invention to ensure proper quality of twisting and to reduce the frequency of wire cutting to a minimum in a high-power, high-speed stranding machine with a tubeless construction and a large number of drawer bobbins. It is.

The problem to be solved by the invention is to provide a brake which only serves to keep the stranded article taut on the small, deflecting rollers during the start and stop phases and prevents the lag of the drawer bobbin. generating a moment such that this braking moment increases with increasing rotational speed and reaches a certain magnitude corresponding to the formation of the desired flight curve of the stranded article when the stranding machine reaches the normal rotational speed. An object of the present invention is to obtain a brake device for a stranded article drawn out from a bobbin in a tubeless high-speed stranding machine.

The present invention addresses this problem by increasing the wire tension in order to generate a small, but constant braking moment in the drawer bobbin and in order to generate a larger, but variable braking moment in the wire of the stranded article. The solution is that the bobbin brake, which is dependent on centrifugal force, is combined with the centrifugal force-related brake into one cooperating brake system.

Furthermore, the invention provides that the bobbin brake belonging to the combined braking device consists in a known manner of a brake lever connected to the brake rod of the pull-out bobbin brake and loaded by a compression spring; has a roll on its free end and is itself journalled on a shaft, which shaft is journalled in a housing fixed to the bobbin frame; In this case, this shaft is non-rotatably connected in the lower part of the housing to a driven body and to a centrifugal weight provided with a brake shoe via two journals fixed therein, and , this weight, in combination with the brake roller and the respective withdrawal speed and the resulting rotation of the brake roller winding the stranded article multiple times, is subject to the centrifugal force of the combined wire brake device. It forms a related part. In this case, it is also possible to replace the centrifugal weight or the centrifugal brake by another brake having the same effect, that is to say to be actuated as a function of the rotational speed of the machine.

Another feature of the invention is that the centrifugal brake can also be installed in the brake frame of a tubeless double-stroke stranded wire machine.
The reason is that it can be assembled as an additional brake.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings showing embodiments thereof.

As shown in FIGS. 1 to 4, the combination braking device according to the invention comprises an adjustable bobbin brake, known per se, and a wire withdrawal speed which is independent of the bobbin brake in terms of the generation of the braking moment. It consists of a related centrifugal brake. The bobbin brake consists of left and right brake levers 9 arranged laterally in front of the return bobbin 1 in the pull-out direction. It is rotatably supported on a shaft 12 which is supported on the shaft 12 . On one end of the brake lever 9 a roller 10 is journalled, while at the other end of the lever arm it is connected to a threaded pull rod 14 . A force is applied to the bobbin 1 by the compression spring 16 so that a braking force is generated on the bobbin 1. For this purpose, a compression spring 16
On the other hand, the metal fitting 1 fixed to the bobbin frame 7
3, and on the other hand by a knurled nut 15 movable on the thread of the drawbar 14. On the other end of the brake lever 9, a brake rod 18 of a bobbin brake (not shown) is supported on a pin 17 between the roller 10 and the shaft 12. This bobbin brake acts as a counterbalance in conjunction with the wire tension acting in response to a constant braking moment set via the compression spring 16.

This combination brake device is further equipped with a so-called centrifugal brake. This brake consists of the above-mentioned housing 20, in which the shaft 12 is supported via a bearing 19. A brake roller 11 is non-rotatably mounted on the upper part of the shaft 12. A driven body 21 is connected to the shaft 12 in the lower part of the housing 20 . This driven body 21 is provided with a brake shoe 24 by means of two journals 22.
Two centrifugal weights 23, provided with ing.

This combination brake device operates as follows.

The stranded article 6 drawn out of the drawer bobbin 1 is first guided over a turning roller 8 which is rotatably journalled in the bobbin frame 7 and extends over the entire width of the bobbin 1, from where it is guided over the roller 10 and It is wound over the brake roller 11 in a number of intersecting turns. Finally, twisted article 6
is guided to the twisting point by a sinusoidal flight curve. The drawer bobbin 1 supported on the shaft 4 is
It is connected to a brake disc 2 via a bush 3 and a driven body 5, and the brake disc 2 further includes:
Braking is performed via the brake rod 18 by the braking force set on the brake lever 9. If the braking moment on the brake disc 2 is too large, then the brake lever 9 rotates about its axis of rotation 12 and shortens the distance between the deflection roller 8 and the roller 10. The brake is therefore released and the brake is again set to the pregiven braking moment. This braking moment is only of such a magnitude that the drawer bobbin 1 is not delayed and the stranded article just remains taut. During the starting process of the stranding machine and after stopping, ie when the withdrawal speed is "zero", only this brake of the combination brake system is active. As the rotational speed of the stranding machine increases, the withdrawal speed also increases. Therefore, the brake roller 11 and therefore also the shaft 12 non-rotatably connected thereto are rotated more quickly together with the centrifugal weight 23 connected thereto. Therefore, the brake shoe 24 of the centrifugal weight 23 attached to the lower end of the shaft 12 is
An increasingly large force contacts the inner wall surface of the housing 20 and generates a braking moment, which grows approximately to the fourth power with the rotational speed and which increases the required magnitude within the twisted article. generates a tensile force that creates a flight curve of the twisted article along the rotor corresponding to .

This combined braking device has decisive advantages over conventionally used devices, in part because a small but, however, constant braking moment can be applied to the drawer bobbin. is generated, on the other hand, by the brake roller at all rotational speeds of the twisting motor,
A strong braking moment is generated for the required configuration of the flight curve of the twisted article.

[Brief explanation of drawings]

FIG. 1 is a side view showing a bobbin frame of a tubeless high-speed stranding machine equipped with an embodiment of the combination brake device according to the present invention, FIG. 2 is a plan view thereof, and FIG.
The figure is an enlarged sectional view of a part of the bobbin frame shown in FIG. 1, and FIG. 4 is a front view of FIG. 3 seen from below. 7... Bobbin frame; 9... Brake lever; 10...
Roller; 11... Brake roller; 12... Shaft; 20
...housing; 21...follower; 22...journal; 23...weight; 24...brake shoe.

Claims (1)

[Claims] 1 A high-speed stranded wire machine with a structure without tubes has a bobbin brake that is disposed inside the rotating member of the bobbin frame 7 and operates in relation to the tension of the wire, and the bobbin brake is fixed to the bobbin frame 7. a brake lever 9 rotatably journalled in a housing 20, a roller 10 and a tension bar 14 for wires attached to each end thereof, and a compression mechanism for applying a force to the tension bar 14; In a wire pull-out brake device that has a bobbin brake consisting of a spring 16 and a brake rod 18 supported on a pin 17 attached to the brake lever 9, the wire pull-out brake device has a function that is related to the tension of the wire. In addition to the bobbin brake, which is actuated as a function of the speed of the wire, a centrifugal brake is also provided, which is actuated as a function of the speed of the wire, and which brake roller 11 on the wire is non-rotatably mounted on the shaft 12. and a driven body 21 integrally mounted on the shaft 12,
It consists of a centrifugal weight 23 that is connected to this driven body 21 and has a brake shoe 24 attached thereto, so that the braking surface of the brake shoe 24 comes into contact with the cylindrical inner surface of the housing 20. A combination type wire draw-out brake device for high-speed stranded wire machine, which is characterized by: