DE1479205C

DE1479205C - Forming tool for the production of coils consisting of a sleeve and end walls

Info

Publication number: DE1479205C
Application number: DE19641479205
Authority: DE
Inventors: Der Anmelder Ist
Original assignee: Franck, Jules, Brasschaat (Belgien)
Priority date: 1963-10-16
Filing date: 1964-10-15
Publication date: 1973-04-26

Description

Fig. 2 eine Seitenansicht der Spule nach Fig. 1, gesehen in Richtung des Pfeiles A, Fig. 2 is a side view of the spool according to Fig. 1, seen in the direction of arrow A,

F i g. 3 eine Seitenansicht der Spule nach F i g. 1, gesehen in Richtung des Pfeiles B, F i g. 3 is a side view of the spool of FIG. 1, seen in the direction of arrow B,

F i g. 4 eine Schnittansicht längs der Linie C-C in Fig.l,F i g. 4 a sectional view along the line CC in Fig.l,

F i g. 5, 6, 7 und 8 Darstellungen entsprechen den F i g. 1 bis 4 einer weiteren, mittels eines erfindungsgemäßen Formwerkzeuges hergestellten Spule, deren Stirnwandungen unterschiedliche Durchbrechungen aufweisen.F i g. 5, 6, 7 and 8 representations correspond to FIGS. 1 to 4 of another, by means of an inventive Form tool produced coil, the end walls of which have different openings exhibit.

In F i g. 1 bis 4 sind für ein erstes Beispiel eine mittels des Formwerkzeugs gefertigte Spule die hohle Nabe 1 und die beiden parallelen Stirnwandungen 2, die scheibenförmig ausgebildet sind und deren Durchmesser je nach Verwendungszweck der Spule verschieden ist, dargestellt. Die Durchbrechungen in den Stirnwandungen bzw. die Rippen 10 werden mittels zweier Kerne 3-4 und 6 ausgebildet. Der mit dem Formteil fest verbundene Kern 3-4 besteht aus einem Zapfen 3 mit zwei diametral gegenüberliegenden Segmenten 4. Der mit dem anderen Formteil fest verbundene Kern 6 weist zwei diametral gegenüberliegende Segmente auf, die auf dem Zapfen 3 zwischen den Segmenten 4 des ersten Kerns verschieblich angeordnet sind. Zwischen den Segmenten der beiden Kerne befinden sich Zwischenräume, die zur Herstellung der Rippen 10 dienen. Die freien Enden der Kernteile 4 und 6 liegen inIn Fig. 1 to 4 show a first example of a coil manufactured by means of the molding tool, the hollow hub 1 and the two parallel end walls 2, which are disc-shaped and whose diameter is different depending on the intended use of the coil. The openings in the end walls or the ribs 10 are formed by means of two cores 3-4 and 6 . The core 3-4 firmly connected to the molded part consists of a pin 3 with two diametrically opposed segments 4. The core 6 firmly connected to the other molded part has two diametrically opposed segments on the pin 3 between the segments 4 of the first core are arranged displaceably. Between the segments of the two cores there are spaces which are used to produce the ribs 10. The free ends of the core parts 4 and 6 are in

ίο der Ebene der Innenfläche der jeweiligen Stirnwandung 2.ίο the level of the inner surface of the respective end wall 2.

In der Ausführungsform nach F i g. 5 bis 8 weist der eine Kern einen Zapfen 7 mit drei Segmenten 8 auf, die in gleich großen Winkelabständen voneinander angeordnet sind und mit dem zweiten Kern, der vier Segmente 9 besitzt, zusammenwirkt. In der einen Stirnwandung wird daher eine Durchbrechung mit vier Verzahnungen gebildet, während die Durchbrechung der anderen Stirnwandung drei Verzahnungen aufweist.In the embodiment according to FIG. 5 to 8 points one core has a pin 7 with three segments 8, which are angularly spaced from one another at the same size are arranged and with the second core, which has four segments 9, cooperates. In the an end wall is therefore formed an opening with four teeth, while the opening the other end wall has three teeth.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

Claim:

Forming tool for the production of coils consisting of a sleeve and end walls, the End wall have openings and radial ribs on the sleeves on the inside are provided which end at the same distance from the coil axis, the molding tool has two cores which can be moved relative to one another in the axial direction, characterized in that that the first core consists of a pin (3) lying in the coil axis and arranged radially at intervals around the pin Segments (4), the end faces of which are in the working position with the inner surfaces fold the one end wall, and that the second core has segments (6) which on slide the pin, whose end faces in the working position with the inner surfaces of the opposite End wall coincide and which are kept at a distance from the segments (4) of the first core.

The invention relates to a molding tool for producing from a sleeve and end walls existing coils, the end walls of which have openings and their sleeves on the Inside radial ribs are provided which end at the same distance from the coil axis, wherein the molding tool has two cores which can be moved relative to one another in the axial direction.

It is known to produce coils which consist of a sleeve which has end walls at its ends having. Inside the sleeve, ribs extend in the axial direction, which are equidistant from end of the bobbin axis. In the known coil, there is also a circular cylindrical inside the sleeve Inner jacket is provided, which forms the bearing for the spindle. The openings in the end walls lie between the sleeve and the inner jacket, so they do not form any teeth the ends of the coil. Slipping such a coil onto an axis with radially protruding Drivers, as is common in motion picture cameras, for example, are not possible. The production the coils are made by injection molding in a mold consisting of two mutually movable mold parts Shape. Cores are arranged on each of the two molded parts, which are parallel to the central axis of the Extend the coil. To form the openings in the end walls at the ends of the coils and cores are used to form the interior of the sleeve, which are spaced radially from the Extend the central axis of the coil. Each molded part has a pin coaxial with the center axis of the coil arranged as a core, which is half as long as the length of the coil to be produced. When closed Form, the pins of the two molded parts butt against each other with their free ends. They form a cylindrical core for creating the inner jacket of the coil. At the Injection molding, however, forms a cast seam at the joint between the two pegs, which at the finished, molded coil inside the jacket pulls around its inner circumference. This cast seam reduces the inner diameter of the jacket. To get a snug fit of the coil on one axis ensure that the casting seam must be done by hand, with great effort, for each individual coil removed. If the cast seam is not removed, the diameter of the axle must be less than the inside diameter of the shell of the coil must be maintained. The coil then wobbles on the axis. These coils are therefore also suitable for use in motion picture cameras and for all purposes where it is used a smooth, reliable run of the bobbins and a quick coupling and uncoupling of the bobbins on one Drive axle arrives, not suitable.

The invention is based on the object of providing a molding tool of the type explained at the beginning create, which ensures a simple and economical production of take-up spools, with the winding spools produced are highly resilient and quick and precise on drive axles with drivers are attachable.

According to the invention, this object is achieved in that the first core consists of one in the coil axis lying pin with radially spaced segments around the pin, the front surfaces of which coincide in the working position with the inner surfaces of one front wall, and that the second core has segments which slide on the pin, the end faces of which are in the working position coincide with the inner surfaces of the opposite end wall and the im Distance from the segments of the first core are kept.

The molding tool according to the invention has significant advantages over the prior art. It is made up of a few simply designed parts and allows due to this simple structure also an opening and closing of the mold by means of simple and easy-to-coordinate Movements of the molded parts. As a result of the simple structure and the simple movements is the invention Forming tool particularly suitable and enabled for the mass production of coils a particularly economical production of the coils. With molding tools according to the invention can Coils are produced in which the teeth are not on the two end walls of the coils are limited, but where the teeth are in the form of ribs from one end of the Extend the spool to the other end of the spool. When pushing such a coil on a Axis with radial drivers then the drivers are not only located in the narrowly delimited area the end walls on the coil, but they come at any point along the length the coil to the plant. The driver can then have a length that is only slightly less than the length of the coil. This creates a very symmetrical load and even power transmission reached by a drive shaft on the spool.

In the following, the invention is illustrated by means of exemplary embodiments in conjunction with the drawing explained. Show it

F i g. 1 in axial section a coil produced by means of the molding tool according to the invention, the end walls of which have perforations,