EP1870364A1 - Thread tightener and device and method for operating a creel - Google Patents

Abstract

The yarn tensioning device comprises a rotating body (18), which is partially wound round by threads (5). An electric motor (19) is connected to the rotating body. The electric motor is equipped with one brake transistor (20) for discharging excess energy produced when the generator of the motor is operated. The brake transistor is able to convert generator energy into heat, which arises when the generator is operated. Independent claims are also included for the following: (1) an arrangement for the operation of a creel for a winding system (2) a method for operating a creel for a winding system involves producing a thread course with the help of winding points.

Description

The invention relates to a thread tensioner according to the preamble of claim 1. The invention further relates to an arrangement for operating a creel for a winding system with inventive thread tensioners. The invention then relates to a method for operating a creel for a winding installation according to the preamble of claim 12.

Thread tensioner with a looped by a thread rotating body, which is connected to set a specific thread train with a drive motor, have long been known and in use. For this purpose used electric motors can also be operated as generators. The FR-2 145 056 For example, shows a thread tensioner with a generator and associated with this yarn. As a result of the rotational movement of the yarn wheel as a result of the action of the yarn, a current drawn by an electrical load resistor is generated in the generator, whereby a counter-torque is effected. This creates a braking effect, which reacts on the threadline of the thread. In practice, it has been found that the handling of the current generated in the generator mode can be difficult.

It is therefore an object of the present invention to avoid the disadvantages of the known, in particular to provide a thread tensioner of the type mentioned, which is easy to handle in all possible operating conditions. Next he should be easy to produce and are characterized by cost advantages.

These objects are achieved according to the invention with a thread tensioner having the features in claim 1. To brake the thread or to generate the thread train, the engine is usually in generator mode. The excess energy that arises in the generator mode in the form of generator current can be dissipated with the help of the brake transistor in a simple manner. Such brake transistors, which can convert electrical energy into heat, are known to those skilled in other fields of application. To simplify the mounting of the brake transistors, it may be advantageous to use commercially available transistors with insulated housing. To generate a certain thread train, the motor can of course also be operated as a drive motor in certain cases (for example when starting up the winding body), which would then actively drive the rotary body. As motors that are also operable as generators, various types of electric motors can be used. Such a motor may be, for example, a stepping motor or a DC motor. However, it is advantageous if the motor is a brushless DC motor ("BLDC" for short). This engine is characterized by a particularly wide range of applications.

In a first embodiment, the brake transistor may be arranged in the region of the side of the motor facing the rotary body. This arrangement has the advantage that the heat generated by the braking transistor can be efficiently led away from the thread tensioner. By high rotational speeds of the rotating body, the removal of heat by convection can be significantly improved.

It may be advantageous if the motor has a motor housing with an end face through which a motor shaft is guided. It can be on the outside of the front side of the motor shaft fixed rotating body and be arranged on the inside of the front side of the brake transistor.

The brake transistor may be mounted on a printed circuit board which is fixed to the inside of the front side of the motor housing, wherein the braking transistor may lie between the printed circuit board and the inside of the front side of the motor housing. Such a printed circuit board can consist of an electrically insulating carrier material on which, at least in some regions, electrically conductive layers (for example copper layers) are applied. Preferably, the circuit board is disk-shaped.

The brake transistor may have an upper side, which forms a contact surface to the inside of the front side of the motor housing, whereby the heat transfer between the brake transistor and the motor housing can be improved. The brake transistor upper side facing the inside preferably runs plane-parallel to the inside of the front side of the motor housing. To compensate for tolerances in the region of the contact surface between the brake transistor and the motor housing, a thermally conductive paste may be provided, whereby the heat transfer is further improved. It would also be conceivable to arrange the brake transistor at a smaller distance from the inside of the end face. In this case, the thermally conductive paste would bridge the distance between the brake transistor and the motor housing.

The brake transistor may be mounted on an upper surface of the circuit board. From the brake transistor electrically conductive conductor means such as conductor tracks or conductor rails can go out, for the production of an electrical operative connection between the brake transistor and motor through the circuit board led to the back of the circuit board. For this purpose, corresponding holes can be provided in the circuit board, through which the conductor means can be performed.

The free ends of the conductor means on the back of the circuit board can form Kontaktfüsse, which can be in electrical contact with a circuit board for the motor control or with the motor control. The control of the brake transistors can be controlled with the help of the motor control.

Advantageously, it may be further if at least two brake transistors are provided in the thread tensioner. Of course, a variety of braking transistors could be used. The choice of the number of transistors depends essentially on the heating power of the transistor.

The rotary body may be formed as a yarn wheel, in the peripheral region of which an approximately V-shaped groove for receiving the yarn is provided. Such a yarn wheel is for example in the FR 2 145 056 shown.

The yarn wheel can be configured in two parts from Garnradscheiben composable, wherein the groove can be formed by assembling the Garnradscheiben. To prevent slippage of the thread on the rotary body distributed over the circumference profiling may be provided. Such profiling is for example from the US 4,413,981 known.

To improve the cooling effect by the rotating rotary body, the rotary body may have on the motor-facing underside at least one wing element for cooling. For a reinforcement of the air swirling for cooling, the rotary body may preferably have a plurality of wing elements, which are distributed approximately radially on the inside of the rotating body.

Another aspect of the invention relates to an arrangement for operating a creel for a winding system. Such an arrangement is for example from the EP 1 162 295 known. Such arrangements may still have a very large number of winding stations and corresponding thread tensioners. By using the thread tensioner according to the invention, the investment costs for such an arrangement, in particular a sewage treatment plant, can be considerably reduced. The thread tensioners also have advantages in terms of maintenance of the assembly.

A further aspect of the invention then relates to a method according to claim 12.

The use of brake transistors has several advantages. Brake transistors are comparatively inexpensive, for example compared to the use of resistors to heat excess energy. The use of brake transistors may also be advantageous in terms of taxation. Thread tensioners can be operated safely, incidents caused by overheated or burning thread tensioners are practically impossible.

Figur 1

Eine schematische Seitenansicht auf eine Wickelanlage mit einem Spulengatter,

Figur 2

Eine Draufsicht auf eine einzelne Spulstelle mit einem Fadenspanner und einem Fadensensor,

Figur 3

Eine Seitenansicht des Fadenspanners und des Fadensensors gemäss Figur 2,

Figur 4

Eine perspektivische Darstellung eines Fadenspanners,

Figur 5

Eine Seitenansicht des Fadenspanners gemäss Figur 4,

Figur 6

Einen Querschnitt durch den Fadenspanner gemäss Figur 4 (Schnitt A-A gemäss Figur 5),

Figur 7

Eine Draufsicht auf den Fadenspanner gemäss Figur 4,

Figur 8

Einen Schnitt durch den Fadenspanner entlang der Schnittlinie B-B gemäss Figur 7,

Figur 9

Einen Schnitt durch den Fadenspanner entlang der Schnittlinie C-C gemäss Figur 7,

Figur 10

Einen Schnitt durch den Fadenspanner gemäss Schnittlinie D-D gemäss Figur 7,

Figur 11

Eine perspektivische Darstellung auf eine Leiterplatte mit zwei Bremstransistoren für den Fadenspanner gemäss Figur 4,

Figur 12

Eine perspektivische Darstellung der Leiterplatte gemäss Figur 11 aus einem anderen Betrachtungswinkel,

Figur 13

Eine Seitenansicht auf die Leiterplatte gemäss Figur 11,

Figur 14

Eine Draufsicht auf die Rückseite der Leiterplatte gemäss Figur 11,

Figur 15

Eine Draufsicht auf die Vorderseite der Leiterplatte gemäss Figur 11,

Figur 16

Eine vergrösserte Darstellung eines Details E aus Figur 14.

Further advantages and individual features of the invention will become apparent from the following description of exemplary embodiments and from the drawings. Show it:

FIG. 1

A schematic side view of a winding system with a creel,

FIG. 2

A top view of a single winding unit with a thread tensioner and a thread sensor,

FIG. 3

A side view of the thread tensioner and the thread sensor according to Figure 2,

FIG. 4

A perspective view of a thread tensioner,

FIG. 5

A side view of the thread tensioner according to FIG. 4,

FIG. 6

A cross section through the thread tensioner according to FIG. 4 (section AA according to FIG. 5),

FIG. 7

A top view of the thread tensioner according to FIG. 4,

FIG. 8

A section through the thread tensioner along the section line BB according to FIG. 7,

FIG. 9

A section through the thread tensioner along the section line CC according to FIG. 7,

FIG. 10

A section through the thread tensioner according to section line DD according to FIG. 7,

FIG. 11

A perspective view of a printed circuit board with two brake transistors for the thread tensioner according to Figure 4,

FIG. 12

A perspective view of the printed circuit board according to FIG. 11 from a different viewing angle,

FIG. 13

A side view of the printed circuit board according to FIG. 11,

FIG. 14

A plan view of the back side of the printed circuit board according to FIG. 11,

FIG. 15

A plan view of the front side of the printed circuit board according to FIG. 11,

FIG. 16

An enlarged view of a detail E from FIG. 14.

Figure 1 shows a designated 1 winding system, such as a sewage treatment plant with a creel 2 and a winding machine 3, z. B. a cone warping machine. Of course, but also paper or Bäummaschinen are conceivable as winding machines. The individual thread bobbins 4 are attached to winding units 7 of the creel and the jointly withdrawn threads 5 pass at least one thread tensioner (or thread brake) 6 to maintain a predetermined thread tension. The example according to FIG. 1 shows a parallel gate. The coils thereby form vertical and horizontal rows, wherein each vertical row forms a thread group on each gate side, the yarn running length of the winding unit to the winding machine is the same size. However, the same principle can also be applied to any other type of gate, e.g. in a V-gate.

On the gate coils of different types, for example, different yarn qualities or different thread colors can be plugged regardless of the thread running length at different locations. Independently of the so-called gate length compensation, the threads of different types can each be exposed to an individual braking force.

In the region of the gate side 8, which is closest to the winding machine 3, the thread tension sensors 9 are preferably arranged for each single thread. However, the arrangement of the thread tension sensors at this point is not mandatory. In principle, it would be advantageous to introduce the thread tension sensors as close as possible to the winding point of the winding machine.

After leaving the creel, the threads pass into the area of the winding machine 3 where they first pass through a flushing sheet 10, in which the threads are given their correct sequence. Subsequently, the threads are fed to the warper blade 11, in which they are brought together to be subsequently wound as a thread assembly 12 via a deflection and / or measuring roller 13 on the winding 15 and on the winding beam 14.

For the operation of the creel 2 for the winding system 1, a control and regulating arrangement 17 is provided. This arrangement 17 is connected to a rotary encoder 16 for the rotation of the winding machine 3. In the highly schematic representation according to FIG. 1, the arrangement 17 receives on the input side a signal from the rotary encoder 16 as well as signals from the voltage sensors 9. On the output side, the arrangement 17 is connected to the thread tensioners 6, which are controlled and regulated by a manipulated variable. As an input signal, for example, a signal for the angular velocity ω can be provided. Particularly suitable as an input signal is a signal for the yarn speed v, which can be calculated, for example, from the angular velocity ω and the measured thickness of the roll 15. However, the thread speed v could also be measured directly with the aid of the deflection roller 13.

In a sharpening process, it is important that threads with a constant length of thread can be pulled off a creel. This requirement is met by so-called dynamic thread tensioners in an optimal way. Particularly suitable for this purpose have thread tensioner proven, which consist essentially of a motor and an associated rotary body. Such thread tensioner are for example from the FR 2 145 056 or even from the DE 43 420 412 A1 known. The basic structure of such a thread tensioner 6, which can be used in a creel for a winding system, in particular a sewage treatment plant, is shown in FIGS. 2 and 3. The rotary body 18 may be configured as a roller or roller, which is at least partially wrapped by the thread. In FIG. 2, for example, the thread 5 is looped around the rotary body 18 at a wrap angle of approximately 270 °. However, as indicated in FIG. 3, the thread 5 can also be looped around the rotating body 18 several times. In addition, a thread sensor 9 can be seen.

The rotary body 18 is connected via an engine shaft 21 to an electric motor 19 (FIG. 3). This can drive the rotary body 18 in one of the two possible directions of rotation depending on the operating state. In general, however, the motor 19 can be operated as a generator. In such a generator mode, the motor acts like an electromagnetic brake. According to the invention, the generator current generated in generator operation is converted by means of brake transistors 20 into heat, whereby this excess energy can be dissipated. Evidently, the brake transistor 20 is arranged in the region of the rotary body 18 facing side. In this way, the rotary body can be used for cooling, because the air swirling formed when the rotary body rotates increases the convection, whereby the routing of the heat generated by the brake transistor can be significantly improved.

In the following figures 4 to 16 various structural details of a preferred thread tensioner can be seen. As can be seen in FIGS. 4 and 5, the engine 19 is one Motor housing 22 surrounded. The rotary body 18 for a thread has an approximately V-shaped groove 24 (Figure 5), in which a thread is receivable. Furthermore, a profiling can be seen, which serves to ensure that the thread without slip from the yarn wheel 18 can be accommodated. This profiling is evidently created by depressions and elevations distributed in an alternating manner over the circumference. A yarn wheel with such a profiling is for example from the US 4,413,981 known.

FIG. 6 shows that the motor 19 has a rotor 34 and a stator 35 with stator windings 36 arranged concentrically around it. The rotor 34 is obviously rotatably mounted on both sides in the motor housing 22 by means of ball bearings (in particular deep groove ball bearings). Furthermore, O-rings 38 are provided to seal the engine in the ball bearings.

Particularly suitable for use in a thread tensioner for a creel of a winding system, a brushless DC motor (short: "BLDC") has been found. Of course, other motors would be, for example, in particular direct current motors with brushes or asynchronous motors.

On the motor shaft 21, the yarn wheel 18 is fixed by a positive and / or non-positive connection. The yarn wheel 18 is constructed in two parts and consists of two Garnradscheiben 41 and 42. The yarn wheel 18 is sunk in a circular recess 47 of the end face 32 of the motor housing 22 partially. Such a depression serves to prevent possible entanglement of a thread with the motor shaft. In FIG. 6, it can further be seen that 18 wing elements 30 are arranged on the underside of the yarn wheel. By such wing elements, the air flow / Luftverwirbelung be greatly enhanced by the yarn wheel (rotating body).

The motor housing consists of an upper housing part 31, a lower housing part 32 and a housing cover 33, which closes the motor housing by means of a central fastening screw. The housing parts are preferably made of aluminum or another material with high thermal conductivity. Through the housing cover 33, a printed circuit board is fixed with a connection 28 for electrical and / or electronic connection to the outside in the housing. Furthermore, 6 screws are indicated in Figure 6, with which the circuit board 25 are fixed to the housing part 31. (See Figures 12-14).

The mounted on a printed circuit board 25 brake transistor 20 is connected via conductor means with contact feet 27 in electrical contact with the printed circuit board 29, on which the motor control is arranged. As Figure 6 shows, the brake transistor 20 contacts the inside of the end face 23 of the motor housing 22 (housing part 31). To bridge any tolerances in the area of the contact surface, a heat-conducting paste designated 37 is provided. Thanks to the thermally conductive paste, the heat generated in the generator operation can be performed by the brake transistor 20 efficiently to the outside.

FIGS. 8 to 9 show further sections through the thread tensioner 6. In FIG. 8, a wing element 30 can be seen in section. Figure 10 shows a cable channel 48, in which cable to the circuit board 29 are feasible. Then, FIGS. 9 and 10 show that the housing parts 31 and 32 are connected to one another by means of screws.

FIGS. 11 to 15 show the printed circuit board 29 equipped with brake transistors 20. The screws 43 and 44 shown in FIGS. 11 and 12 and 13 and 14 serve to secure the circuit board PCB to the motor housing. As is apparent from FIG. 12, the fastening screw 43 is guided by a brake transistor 20. For this purpose, a corresponding hole is provided in the brake transistor. From the brake transistor 20 lead designed as rails conductor means 26 away, which are guided by the circuit board 29. The free ends of the conductor means form contact feet 27 for making electrical contact with the electric motor.

Evidently, two brake transistors 20 are provided on the printed circuit board 29, which are identified by 20 'and 20 "in FIG. 12 (compare FIG. 11/12, which show the associated contact feet 27' and 27", respectively).

FIG. 15 shows a connection surface 45 for the connection of the printed circuit board. Furthermore, a marked with 46 area recognizable, which indicates a bearing surface to the inside of the motor housing. The printed circuit board 29 is thus connected directly to the housing only in the area of this bearing surface 46.

Claims (12)

Thread tensioner for generating a specific thread tension on a thread (5) which is withdrawn from a winding station (7) of a creel (2) and fed to a winding installation (1), in particular a sewage treatment plant, with a rotary body (18) which is separated from the thread ( 5) is at least partially umschlingbar and connected to the rotary body electric motor (19), by means of which the rotary body is driven, characterized in that the motor (19) for discharging excess energy in the generator mode of the engine equipped with at least one brake transistor (20) is, with which of the generator current generator power is converted into heat. Thread tensioner according to claim 1, characterized in that the braking transistor (20) in the region of the rotary body (18) facing side of the motor (19) is arranged. Thread tensioner according to claim 1 or 2, characterized in that the motor (19) has a motor housing (22) with an end face (23) through which a motor shaft (21) is performed, wherein on the outside of the end face (23) of the motor shaft (21) fixed rotating body (18) and on the inside of the end face (23) of the brake transistor (20) is arranged. Thread tensioner according to one of claims 1 to 3, characterized in that the braking transistor (20) on a disc-shaped printed circuit board (25) is mounted, which is fixed to the inside of the end face (23) of the motor housing (22). Thread tensioner according to one of claims 1 to 4, characterized in that the brake transistor (20) has an upper side (49) which forms a contact surface to the inside of the end face (23) of the motor housing (22) and that to compensate for tolerances in the Contact surface between the brake transistor (20) and the motor housing (22) is provided a thermally conductive paste. Thread tensioner according to one of claims 1 to 4, characterized in that the braking transistor (20) is mounted on an upper side of the printed circuit board (25) and that from the braking transistor conductor means (26) go out, for establishing an electrical operative connection between the braking transistor (20) and Motor (19) in the generator mode by the circuit board (25) to the back of the circuit board (25) are guided. Thread tensioner according to claim 6, characterized in that the free ends of the conductor means (26) on the back of the circuit board (25) contact feet (25) which are in electrical contact with a circuit board (29) for the motor control of the motor (19) , Thread tensioner according to one of claims 1 to 4, characterized in that two brake transistors (20) are provided. Thread tensioner according to one of claims 1 to 4, characterized in that the rotary body (18) is designed as a yarn wheel, in the peripheral region of an approximately V-shaped groove (40) for receiving the thread (5) is provided. Thread tensioner according to one of claims 1 to 4, characterized in that the rotary body (18) on the motor-facing underside has at least one wing element (30) for cooling in the generator mode. Arrangement for operating a creel (2) for a winding installation (1), in particular a sewage treatment plant, having a creel (2) with several winding stations (7) and a winding machine (3) for jointly winding a plurality of threads (5) of the same or different type, which are withdrawn from the winding units, and at least one thread tensioner (6) associated with each winding unit according to one of claims 1 to 10, to which the yarn can be acted upon by a braking force to maintain a preferably constant thread tension of each thread. Method for operating a creel (2) for a winding installation (1), in particular a sewage treatment plant, having a plurality of winding stations (7), in which a plurality of threads (5) of the same or different type are withdrawn from the winding stations together with a rotating winding machine (3) be applied, wherein at each winding unit the thread for generating a specific thread tension by means of at least one thread tensioner (6) is subjected to a variable braking force, wherein the thread tensioner is activated by a motor associated therewith (19), characterized in that the motor (19 ) In the generator mode for dissipating excess energy of the motor by means of at least one brake transistor (20) in particular according to one of claims 1 to 10 generator current is converted into heat.

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