DD139376B1 - DEVICE FOR CONNECTING COILS - Google Patents

Description

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a) Title of the invention

Device for incorporating ¹ coil

b) Field of application of the invention

The invention relates to a device for incorporating coils for electrical machines and apparatus, in particular for isolating so-called needle-shaped coils, in which the two parallel coil sides are close to each other.

c) Characteristic of the known technical solutions

For incorporating such needle-shaped coils, it is known according to the WP 41 478 to use devices with a ring magazine, wherein the coil to be incorporated is guided with a leg through the a lockable opening having annular magazine.

From a stationary supply roll, the tape is withdrawn by means of the rotating ring magazine and incorporated the coil. At the same time, a supply of tape is stored in the ring magazine.

After pulling the ring magazine, the tape is separated on the supply roll, after which the wound in the ring magazine tape supply can be processed from the inside. In this process

• 25 of the filling and emptying, the ring magazine occurs between the ring magazine and the tape and between the individual layers of the tape relative movement and thus a highly dependent on the degree of filling of the ring magazine friction. The stability of the strip tension is a decisive factor for the quality of the insulation.

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Therefore, a large number of proposals have been made for reducing the strip friction and keeping the strip tension constant.

A measure to WP 33 474 is the equipment of Ringmagazingrundes with cylindrical rollers and according to DE-AS 16 60 012 the arrangement of an adjustable, acting on the located in the ring magazine tape winding leaf spring. While arranged in Ringmagazingrund. Cylindrical rollers, especially their bearings, easily pollute and then cause interference by increased friction, the leaf spring assembly according to DE-AS 16 60 012 has the disadvantage that the belt tension increases with the magazine filling.

The proposal in DE-PS 923,018 and in US-PS 31 00 089, after which the ring magazine filled with pleated folded ribbon and only the expiring band is braked or guided, allows for an approximately constant strip tension.

But since the filling of the ring magazine is very cumbersome, requires separate preparatory work and does not allow large lengths of tape with a comparatively same magazine cross-section, the achievable labor productivity is low.

Clamping devices for ring magazines with constant spring force, which are arranged between the last pulley and the coil, as described in VVP 41 478, lead due to the different natural friction of the magazine tape to different tensile stresses and thus to uneven bandages. This effect becomes stronger the more insulating tape is to be stored in the ring magazine.

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Solutions for almost constant strip tension, as for the Itabändeleinrichtungen according to DE-OS 25 17 249, 25 17 250 and 25 17 251 are provided, consist of two acting on a brake disc, controlled by the Bandwickeldurchmeaser brake springs. For reasons of space, they can not be transferred to devices with a ring magazine, since in these cases the limited largest possible cross-section is largely required for the magazine space.

Although the solution for a ring magazine a binding machine according to the DR-PS 314 876 also allows a constant strip tension, but requires to fill the magazine an additional operation. Another disadvantage is to be appreciated that are favored by the multiple deflection of the band Palten- and Tlitenbildüngen. The circulating rollers outside the magazine also require additional space. This disadvantage becomes particularly serious when a Llagazinquerschnitt is required due to the length of the needle forming coils to be incorporated in a train whose diagonal almost corresponds to the leg distance of the needle-shaped coil.

d) Object of the invention

The object of the invention is to increase the productivity and quality of the machine incorporation of needle forming coils.

e) Presentation of the essence of the invention

The invention is based on the technical object to provide a device for incorporating coils of electrical machines, in particular of needle-shaped coils, with the use of a mounted in a housing ring magazine as large as possible uninterrupted tape lengths, largely constant tape tension

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and a high reliability, especially insensitivity to contamination, can be achieved.

According to the invention, the technical object is achieved in that the known with a removable segment provided, having a U-shaped cross-section rotatable ring magazine such recessed side walls that the clear width of the ring magazine only at its extreme extent approximately equal to the bandwidth that the reason of the ring magazine and arranged in this slot-shaped passage opening polished surfaces and that a pressure mechanism is provided which consists of a tangent to Magazinerund lever arranged between its pivot point and the support point in the ring magazine on a spring or a weighted cable approximately perpendicular to its axis is loaded and is able to roll on a in the housing on the side facing away from the ring magazine lever side convex curve, wherein the positive connection between the lever and the curve by two intersecting Federstahlbä is made.

In an advantageous embodiment, the axis of the lead-through opening in Magazinerund is arranged on a helical line whose pitch angle is supplemented with the Bandabiaufwinkel to 90 °. By this measure, a good tape guide is achieved when binding the coils and prevents the turning and bag making.

The device according to the invention has the following mode of action: from one outside the device to the other.

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the supply roll located by coils of electric machines, the tape is pulled through .the Durchfhrung opening of the ring magazine and mounted on the previously inserted coil legs. With startup of the device, the ring magazine begins to rotate in the housing around the coil legs, wherein the tape is wrapped on the coil legs and at the same time a tape supply in the magazine room. If the entire supply of tape magaziert, the tape is separated on the supply roll and the tape located in the magazine space wound on the spool legs. The strip bias is kept almost constant during this process by the device according to the invention.

The means provided for this purpose have the following mode of action;

The edge formed on the outermost circumference by the recess of the side walls ensures that the tape roll lies in the middle of the magazine space and thus there is no friction on the side walls.

The resulting at Magazinerund and in the passage opening friction, which has been reduced in the prior art by the arrangement of susceptible rollers is reduced by polished surfaces according to the invention. In order to compensate for the frictional forces which change as a function of the stored tape supply, the pressure mechanism produces a high pressure force at a small supply of tape, as occurs at the beginning and at the end of the winding process, and a small pressure force at a large supply of tape, ie the pressure mechanism has a negative action Force-displacement characteristic. This negative characteristic curve is achieved in that with increasing supply of tape in the ring magazine, the lever of the pressure mechanism

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the tensile force of the spring or the cable is deflected, wherein the pivot point of the lever shifts the rolling on the convex curve in the direction of the point of application of the spring or the weight-loaded cable pull and thus the effective lever length is shortened.

The convex curved curve and the spring must be designed so that the product of spring force χ lever arm is smaller despite increasing spring tension or constant cable with increasing deflection of the lever. The intersecting spring steel bands ensure the rolling of the lever on the curve.

f) embodiment

The invention will be explained below using an exemplary embodiment.

In the accompanying drawing, Fig. 1 shows a side view and Fig. 2 shows a cross section through the device for incorporating coils.

The device has a rotatably mounted in a housing not shown ring magazine 1. iäs consists of a U-shaped cross-section ring which is open to the outside and a removable segment 2 for inserting the coil leg 3. The side walls 4 and 4 are provided with recesses 5 and 5 ', so that from the band. 6 forming V / ickel 7 is not applied to the side walls and 4 ^f .. At the outermost diameter of the side walls 4 and 4 ¹ extending over the entire circumference approaches 8 and 8 ^f are present. The clear width of the U-shaped cross section of the annular magazine 1 corresponds between the lugs 8 and 8 'approximately the width of

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Bandes 6. The Guuxidflache 9 of the ring magazine 1 and the slot-shaped passage opening Ю have polished surfaces. To generate the pressing force, a lever 11 is provided, which is fixed with two parallel intersecting spring bands 12 and 12 'to a fixed housing, convex curve 13 that it can roll on the curve 13 when deflecting de3 lever 11. For this purpose, the spring band 12 is attached at one end to the lever 11 and at the other end to the curve 13. The spring band 12 'is fixed at its ends to the lever 11 on the curve 13 so that · it intersects with the spring band 12 in parallel planes. The lever 11 about vertically arranged tension spring 14 is supported in the housing and engages the lever 11 between the Abwälzpunkt on the curve 13 and the support point on the ring magazine 1 at.

To avoid wrinkles when incorporating the bobbin coil 3 with the band 6, the axis 15 of the slot-shaped passage opening 10 is arranged on a base 9 of the Ringmagazines 1.verlaufenden helical whose slope angle is supplemented with the Bandabi on v / inkel to 90 °.

Claims (2)

- 8 - 2087 80 Invention claim: 1. A device for incorporating coils of electrical machines, in particular of needle-shaped coils, which has a housing mounted in a U-shaped cross-section exhibiting rotatable ring magazine with a removable segment, characterized in that the side walls of the ring magazine are recessed so that its clear width only at the outermost circumference approximately equal to the bandwidth that the base of the annular magazine and arranged in this, elongated hole Durcnführungsöffnung polished surfaces and that a Andruckmecnanismus is provided which consists of a tangentially arranged to Magazinerund lever with a spring or a Weight-loaded cable is loaded approximately perpendicular to his Achae and is able to roll on a, located in the housing on the side facing away from the ring magazine lever side convex curve, the positive connection between the lever and the curve durGh two cross end spring steel strips is made. 2. Device according to item 1, characterized in that the axis of the ilagazingrund arranged through opening is located on a helix whose pitch angle added to the tape outlet angle to 90 °.