JPS60228364A - Device for giving wire tension - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire tensioning device for a winding machine, which is disposed between a supply reel and a core for supplying wire from the supply reel to the core or jig on which the wire is to be wound.

A wire tensioning device of this type is described in German Patent Application No. 2318884. There are some listed in the issue. This known device has a rotatably mounted lever machine +M,
This lever mechanism cooperates with a spring and has a pulley for the wire to be wound.

It is common to use a tensioning device in a winding machine to wind a coil around a core with a non-circular cross section. Such winding machines are used, for example, for the production of toroidal deflection coils for cathode ray tubes or rectangular rotors for electric motors. Furthermore, a tensioning device is also used in the winding machine when winding the deflection coil in a saddle shape around an irregularly shaped jig.

Due to the asymmetrical shape of the core or jig, the wire consumption per unit time varies during winding. That is, the speed at which the wire is wound around the core or jig varies. The tension in the wire also varies, and therefore, when winding at high speeds, there is a risk that the wire will sag or break. Furthermore, variations in wire tension lead to non-uniform winding distribution, which is particularly undesirable in the case of cathode ray tube deflection coils.

To reduce wire tension fluctuations in the winding machine, a wire tensioning device is disposed between the supply reel and the core or jig. Such a wire tensioning device must satisfy at least two conditions. First, it is necessary to be able to wind the wire as quickly as possible to remove any slack that may occur in the wire, and to maintain a certain tension in the wire being wound.1. Second, the wire tension must be kept as constant as possible to avoid over-tensioning.

When a wire tensioning device of the type described in DE 28 18 884, mentioned above, is used in a winding machine, the wire passing through the boo is subject to C depending on the acceleration or deceleration of the wire.
Produces smaller or thicker wire loops. Reduce fluctuations in wire tension, avoid wire loops that are too large,
In order to avoid being too small, this known wire tensioning device must be provided with a separate wire braking device. Such braking devices are known per se, and include a rotatable cylindrical roller, which applies an adjustable braking force, and which guides the wire.

However, the fire point of this known wire tensioning dipping 1d is 1
Due to the comparatively large size and mechanism, the lever mechanism does not respond relatively sluggishly to deceleration of the wire, and still causes large displacement fluctuations. However, known wire tensioning devices must be used in conjunction with separate wire braking devices, which increases the manufacturing costs of the winding machine. Furthermore, the lever 48R has a limited ability to absorb slack in the wire.

Accordingly, it is an object of the present invention to provide a wire tensioning device that has a high slack absorbing ability and does not require a separate wire braking device.

To achieve this objective, the wire tensioning device of the present invention comprises a tensioning wheel that is connected to a drive unit, is rotatable, and has a wire support surface on its periphery that supports the wire, and a tensioning wheel that rotates together with the tensioning wheel. is free,
The wheel is characterized by a wire guide that guides the wire to a specific position on the wire support surface of the wheel.

When a wire tensioning device according to the present invention is used in winding 11411, the winding wire is routed from the supply reel to the tensioning wheel and the wire guide is brought to the wire support surface of the tensioning wheel. The wire is wound over at least a portion of the supporting surface before reaching the core or jig to be wound. A drive unit applies a moment to the tensioning wheel in a direction opposite to the direction of wire passage through the wire support surface of the wheel. At this time, due to the friction that occurs between the wire and the wheel, the drive unit applies a specific tensile force to the wire section located between the wheel and the core or jig, and this tensile force creates a specific tension on the wire. . When producing a uniform wire wrap, the wheel is stationary and the wire slides over the wire support surface of the wheel.

This wire support surface always supports a fixed length of wire. However, as the winding of the wire changes, the wheel rotates in response to the acceleration or deceleration of the wire moment, changing the length of the wire in contact with the wire support surface, feeding or winding more wire. . In any case, the wire tensioning device according to the present invention can maintain a high tension of ->n in the winding wire fed to the core or jig.

Preferably, the drive unit is controllable so that the moment on the tensioning wheel) and therefore the required wire tension can be adjusted quickly and effectively.

The advantage of the wire tensioning device according to the invention is its small size and the ability to quickly respond to variations in wire winding. In this way variations in wire tension are reduced to acceptable levels. Preferably, the tensioning wheel is made of a material of low specific gravity, such as aluminium, or plastic (
For example, it is made of polycarbonate. Very satisfactory results are obtained when the tensioning wheel has a plurality of spokes between the hub and the wire support surface.

Another advantage of the wire tensioning device according to the invention is that a separate braking device is not required. This is because the friction exerted on the winding wire by the tensioning wheel is based on the length of the wire in contact with the wire support surface of this wheel, and this friction provides an adequate damping force for the wire. According to the device of the invention, changes in the coefficient of friction between the wire and the wire support surface do not affect the wire tension. Furthermore, the device according to the invention allows wires with different cross sections to be accommodated without any modifications.

To prevent the wire support surface of the tensioning wheel from wearing out prematurely, this surface can be provided with a wear-resistant or hardened layer.

In a preferred embodiment of the invention, the twist guide extends from the axis of the tensioning wheel to the wire support surface of this wheel.

The advantage of this configuration is that it can produce smooth movement of the wire even when the tension wheel rotates at high speeds. This is because uncontrollable movements, such as vibrations, cannot occur in the wire section between the supply reel and the wheel.

Different configurations of wire guides can also be used. For example, two pulleys are placed side by side. easy,
An effective and efficient wire guide is as follows: The wire guide is constituted by a tube bent at both ends, one end of the tube is an open end extending along the axis of the tensioning wheel, and the other end is an open end extending along the axial direction of the tensioning wheel. The end portion is obtained by an open end extending l'C in the annular direction of the wire support surface of the wheel. This wire guide also has the advantage that it can be made extremely lightweight by appropriately selecting the material for forming it. This material can be, for example, a plastic such as polyvinyl chloride. ) Furthermore, according to the present invention, in a winding machine that supplies wire from a supply reel to a core or jig on which the wire is to be wound, ζ1. -: a tensioning wheel that is rotatable in connection with the m-movement unit and has a wire support surface on its periphery that supports the wire, and a tensioning wheel that is rotatable together with the tensioning wheel and that It is possible to obtain a winding machine equipped with four wire tensioning devices including a wire guide for guiding the wire.

Next, the present invention will be explained in detail with reference to the drawings.

The winding machine has a winding jig 3 disposed on a rotatable shaft l, and this winding jig 3 is driven by an electric motor 5 (first
(See figure) The wire 9 with 11 windings is pulled out from the supply le/luer and supplied to the winding jig 3. Supply □ Pass the C wire 9 between the reel and the winding jig 3 through the wire tensioning device fftt according to the invention. To avoid contaminating the wire tensioning device 11, the wire 9 is first passed through a cleaning element 13. This cleaning element 1
3 is constituted by two felt pads which are pressed together, for example by a spring load. These felt pads provide the wire 9 with a predetermined pretension. This pretensioning force has a positive influence on the operation of the wire tensioning device 11.

The wire tensioning device 11 has a force applying wheel (hereinafter referred to as "wheel") 15 attached to a freely rotatable shaft 17 of a controllable DC motor (hereinafter referred to as "motor") 19. This wheel 15 includes a hub 21 that is locked to the shaft 17 and rotates together with the shaft 17, and a hub 21 that is locked to the shaft 17 and rotates together with the shaft 17.
ni spoke j! 5 (see FIG. 2). Two radially projecting flanges 27 are provided on the outer circumferential edge of the rim 2a, and between these seven rungs a cylindrical wire support surface 29 is formed for supporting each turn or part of a turn of the wire.

A nylon tube 31 is attached to the side of the wheel 15 far from the motor 19. This tube guides the wire. The tube (wire guide) 81 has its end bent,
two open ends 8 forming an inlet and an outlet for the wire;
1A and 31B. End 81A is disposed coaxially with wheel 15, and end 81B is disposed coaxially with wire support surface 2.
9 and extending in a direction tangent to the wire support surface 29 at a location . This shape of the tube 31 ensures that the wire is guided onto the wire support surface 29 without twisting. If guided in a tangled manner, unacceptable deformation will occur.

The action of the winding machine is as follows. When the winding jig 8 rotates, the wire 9 is wound up. The jig 3 has an irregular, non-circular shape, so that the speed of the wire 9 varies significantly periodically as a function of the angle of rotation. Therefore, unless a special groove configuration is provided for C1, the tension when wound on the winding jig 3 will vary greatly.

This results in a coil that is poorly wound.

To prevent this, a wire tensioning device according to the invention is provided, in which the wire 9 is wound around a tensioning wheel 15 and guided onto the wire support surface 29 of this wheel.

The motor 19 exerts a constant moment M on the wheel in a direction opposite to the direction in which the wire 9 wraps around the wire support surface 29 of the wheel 15 from the wire guiding tube 81 . Due to the friction between the wire 9 and the wire support surface 29, this moment) M exerts a tensile force on the wire fed to the winding jig 8, thus creating a certain tension in the wire.

If the winding of the wire is uniform, the moment applied to the wheel 15 causes this wheel 15 to come to rest. The wire 9 then slides on the wire support surface 29 and the wire fed to the winding jig 8 has a constant tension δ. The wrap angle α of the wire 9 with respect to the wheel 15 is centered by the friction coefficient μ between the wire 9 and the wire support surface 29 and the wire tension δ7 applied to the wire support surface. These parameters δ, δ7. The relationship between μ and α is expressed by the equation δ−δ7·ettcl, which is shortened in mechanical engineering.

The tension δ7 is determined by the frictional forces to which the wire 9 is subjected, in particular in the wire guiding tube 31 and in the tarnishing element 13. This tension δ7 is extremely small compared to the required wire tension δ. The friction coefficient μ is selected such that the wire 9 is wrapped around the wheel 15 two to eight times when uniform winding is performed.

However, as mentioned above, the winding jig 8 winds the wire 9 at varying speeds. When this winding speed becomes slower, the wheel 15 rotates in the direction of the moment M, and the winding angle α
increases. Therefore, the term e" increases, and as a result, the force applied to the wire 9 unreeled from the supply reel decreases,
The speed of the wire 9 being withdrawn from the supply reel is also reduced. The opposite occurs as the speed of the wire 9 being wound onto the winding jig 3 increases. That is, the length of the wire wound around the wheel is reduced, and the amount of wire fed out from the supply reel per unit time is increased. Therefore, in any case, the tension δ of the wire 9 supplied to the winding jig 8 is subject to extremely small fluctuations.

According to the invention, the length of the wire supported by the tensioning wheel remains approximately equal to a preselected average value. Furthermore, the approximately constant tension of the wire supplied to the winding jig is independent of changes in the wire cross section and changes in the coefficient of friction.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a winding machine equipped with a wire tensioning device according to the present invention, and FIG. 2 is a side view of M-Ti@,f in FIG. 1. 1... Axis 3... Winding jig 5... Electric motor 7... Supply +J-ru 9...
Wire 11...Wire tension applying device 18...Cleaning element 15...'J wheel (wheel) 17
・・：kl+ 19 ・・Direct sales motor (motor〕2】・
...Hub 23.Rim 25..Spokes 27..Flange 29..Wire support surface 31..Tube ThTF Applicant N.B.Philips Fluiran Penfapriken 162

Claims (1)

[Claims] t. A wire tensioning device of a winding machine disposed between a supply reel and a core for supplying wire from a supply reel to a core or jig on which the wire is to be wound, connected to a drive unit. a tensioning wheel that is rotatable and has a wire support surface on its periphery that supports the wire;
A wire tensioning device comprising a wire guide that is rotatable together with the tensioning wheel and guides the wire to a specific position on the wire support surface of the wheel. 2. The wire tensioning device of claim 1, wherein the wire guide extends from a line of the tensioning wheel to a wire support surface of the wheel. & said wire guide is constituted by a tube bent at both ends, one end of said tube being an open end extending 3°C in the axis of the tensioning wheel, and the other end being a wire support of said wheel. Claim 2 characterized in that the open end extends ω degrees C in the tangential direction of the surface.
Wire tension applying device t, as described in . Table 1. A winding machine that supplies wire from a supply reel to a core or jig on which the wire is to be wound; 1. A winding machine comprising a wire tensioning device rotatable together with a tensioning wheel and comprising a wire guide for guiding the wire to a specific position on the wire support surface of the wheel.