DE203688C

DE203688C -

Info

Publication number: DE203688C
Application number: DENDAT203688D
Authority: DE

Description

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PATENTAMT.PATENT OFFICE.

PATENTSCHRIFTPATENT LETTERING

KLASSE 42 gv GRUPPECLASS 42 gv GROUP

Patentiert im Deutschen Reiche vom 11. Mai 1907 ab.Patented in the German Empire on May 11, 1907.

In dem Patent 203686 ist ein Verfahren und eine Vorrichtung zur Herstellung von Schalldiagrammträgern, oder kurz ausgedrückt zur Herstellung von Phonographenwalzen, beschrieben worden, wobei eine beheizte Form mit großer Geschwindigkeit gedreht wird, in in welche geschmolzenes Material eingeführt wird, so daß das letztere gleichförmig durch die Wirkang der Zentrifugalkraft in der Höhlung der Form verteilt wird, wobei Luft- und Gasblasen in radialer Richtung nach innen getrieben werden.In the patent 203686 is a method and an apparatus for the production of Sound diagram carriers, or to put it briefly, for the production of phonograph cylinders while rotating a heated mold at high speed into which molten material is introduced so that the latter becomes uniform by the action of centrifugal force in the cavity the mold is distributed, with air and gas bubbles in a radial direction inwards to be driven.

Das in jenem Patent beschriebene Verfahren findet dann seinen Abschluß damit, daß die Form schließlich bei fortgesetzter Drehung abgekühlt wird, so daß das Material in der Formhöhlung zu erhärten vermag. Bei der Herstellung von Phonographenwalzen nach den Angaben des genannten Patentes werden Formen der auch sonst gegenwärtig üblichen Art benutzt, welche etwa 7 mm dick sind und eine Metallmasse enthalten, die etwas größer ist als die Masse der herzustellenden Phonographenwalzen. Wenn man bei Anwendung von Formen der genannten Art Phbnographenwalzen herstellen wollte, indem man das geschmolzene Material in eine kalte Form einführt, so' würde die Formfüllung sehr rasch an der das Schalldiagramm tragenden.The process described in that patent then ends with that the mold is eventually cooled with continued rotation, so that the material able to harden in the cavity. In the manufacture of phonograph cylinders according to the details of the patent mentioned are forms of those that are otherwise currently customary Art used, which are about 7 mm thick and contain a metal mass that something is greater than the mass of the phonograph cylinders to be produced. When you apply Wanted to manufacture molds of the type mentioned Phbnographenwalzen by turning the molten material into a cold one Introduces the shape, so 'the filling of the shape would very quickly reach the one carrying the sound diagram.

Fläche der Form erkalten, was zum Entstehen von Luftblasen führen und eine gleichmäßige Verteilung des Materials verhindern würde, wie sie stattfindet, wenn man die Form erhitzt; wodurch dem geschmolzenen Material ermöglicht wird, in dem flüssigen Zustande zu verharren, während es durch die Wirkung der Zentrifugalkraft gleichförmig über die Wandfläche der Form verteilt wird.The surface of the mold will cool down, which will lead to the formation of air bubbles and become even It would prevent distribution of the material as it takes place when you change the shape heated; thereby allowing the molten material to be in the liquid state to pause while it is uniform over the by the action of centrifugal force Wall surface of the form is distributed.

Vorliegende Erfindung bezieht sich nun auf ein Verfahren zur Herstellung von Phonographenwalzen unter Benutzung von kalten Formen. Dieses Verfahren beruht auf der Anwendung von Formen mit sehr dünnen Wänden, in deren Höhlung das geschmolzene Material bei hoher Temperatur eingeführt wird. Die Wandstärke der Form muß dabei jedenfalls dünner genommen werden, als die Stärke der zu formenden Walze betragen soll. Wenn auf diese Weise gearbeitet wird, so vermag die Hitze des in die Form eingeführten geschmolzenen Materials die Temperatur der Form bis zum Schmelzpunkt des Materials oder über den Schmelzpunkt hinaus zu erhöhen, so daß die Formfüllung im flüssigen Zustande verharrt und auf diese Weise die Möglichkeit bietet, daß die Luft- und Gasblasen in radialer Richtung nach innen getrieben werden, wie es bei dem Ver-The present invention now relates to a method of making phonograph rolls using cold molds. This method is based on the application of shapes with very thin Walls, in the cavity of which the molten material is introduced at high temperature will. The wall thickness of the mold must in any case be made thinner than the thickness of the roller to be molded target. When worked in this way, the heat of that which is introduced into the mold can molten material, the temperature of the mold up to or above the melting point of the material to increase, so that the mold filling remains in the liquid state and in this way offers the possibility that the air and gas bubbles are driven inward in the radial direction, as is the case with the

Claims

drive the simultaneous patent referred to above is the case.

The material for making the phonograph rollers can have any suitable composition and, for example, consist of substances similar to the hard wax that is now widely used for the production of phonograph rollers. The temperature to which the molten material which is to be used according to the invention is heated depends, of course, on the nature of this material and on the heat capacity of the mold; However, experience has shown that in a mold with a wall thickness of about i ^x / ₂ mm, a temperature of the molten material to be introduced into the mold of 38 ° C. above the melting point is amply sufficient for the intended purpose. The decisive aspect for determining the material temperature to be used is that the heat content of the material to be introduced into the mold. molten mass is sufficiently large to heat the mold to the melting point of the material or above before so much heat is removed from the mass poured into the mold that the mass is thereby cooled to the solidification point. It is therefore important to maintain the material in a liquid state while it is being distributed over the wall of the mold to allow the air or gas bubbles to escape in a radial inward direction, as described in the referenced patent. After the material has been uniformly distributed in the mold cavity in the manner indicated, it can be artificially cooled in some rapid manner; for example through the use of cooling pads, as indicated in the patent mentioned several times. When the mold filling has been solidified in the manner described, the finished phonograph roller, after it has been released from the mold surface by contraction, can be removed from the mold cavity, whereupon the cavity of the roller can be trimmed in a suitable known manner.

Godfather τ-Α ν saying:

Process for the production of sound diagram carriers by introducing the Molding material in a rapidly rotating mold, characterized in that as rotating Form one of a very small size, only a fraction of the wall thickness of the rolls to be produced Wall thickness is used, and that the molding material in this shape with a . Temperature is introduced, which is sufficiently high above its melting point to the shape up above the melting point to be heated by giving off heat.