DE205887C

DE205887C -

Info

Publication number: DE205887C
Application number: DENDAT205887D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

PATENTSCHRIFTPATENT LETTERING

-M 205887-KLASSE 42g·. GRUPPE -M 205887-CLASS 42g ·. GROUP

MAX HELLMANN in RIXDORF b. BERLIN.MAX HELLMANN in RIXDORF b. BERLIN.

Patentiert im Deutschen Reiche vom 11. Juli 1906 ab.Patented in the German Empire on July 11, 1906.

Es ist bekannt, zwei von Elektromotoren betriebene Apparate dadurch in synchronem Gang zu erhalten, daß man in dem Motor des zu langsam laufenden den Strom verstärkt 5 oder in dem des zu rasch laufenden ihn schwächt. Auch ist es bekannt, den zu rasch laufenden durch Reibung zu bremsen. Diese Regelungsvorrichtungen, welche unmittelbar an dem verhältnismäßig trägen Motor wirken, gestatten nun nicht, die Bremsung in rascher zeitlicher Folge ein- und auszuschalten. Es kann so leicht eintreten, daß die Bremsung länger dauert als bis zu jenem Zeitpunkt, an dem beide Apparate sich eingeholt haben, so daß in diesem Falle der anfangs voreilende Apparat nunmehr zurückbleibt. Dies ist besonders dort störend, wo es sich darum handelt, Kinematographen und Sprechmaschinen gegeneinander abzustimmen. Da es hier weniger nötig ist, daß beide Apparate in jedem kleinen Zeitintervall genau die gleiche Tourenzahl haben, als vielmehr, daß keine dauernde Verschiebung der einander zugeordneten Phasen beider Apparate auftritt, so kann die Regelung in der Weise erfolgen, daß man den einen, und zwar zweckmäßig den Kinematographen, mit einem Motor mit für den synchronen Gang beider Apparate zu großer Tourenzahl betreibt. Sowie dieser Apparat nun um einen bestimmten kleinen Betrag vorgeeilt ist, wirkt auf ihn eine Bremse so lange, bis diese Voreilung aufgehoben ist, alsdann wird die Bremsung ausgeschaltet, man gestattet ihm, wieder so lange mit größerer Tourenzahl zu laufen, bis ein Voreilen abermals eingetreten ist, worauf sich das Spiel wiederholt. Würde man nun die Bremsung unmittelbar am Motor wirken lassen, so könnten sich die einzelnen Bremsungen nicht hinreichend rasch folgen, da ja jede Bremsung,,etwas verzögert beginnt und aufhört, und diese Verzögerung unter übrigens gleichen Umständen um so größer ist, je größer das Trägheitsmoment der bewegten zu bremsenden Massen ist. Man läßt deshalb die Bremsung in ihrer vollen Stärke nur auf den verhältnismäßig leichten Kinematographen wirken, während sie sich auf den immerhin viel schwereren Motoranker in einem sehr geringen Maß überträgt. Zu diesem Zweck ist der Motoranker?, mit dem . Kinematographen nicht starr, sondern durch eine der bekannten Reibungskupplungen verbunden, und an der Achse des Kinematographen befindet sich eine Eisenscheibe, die vor einem Elektromagneten sich dreht. Durch eine teils mit dem Kinematographen, teils mit der Sprechmaschine starr verbundene Schaltvorrichtung wird nun, sowie der erste der beiden Apparate um einen bestimmten Betrag vorgeeilt ist, in dem Elektromagneten der Strom geschlossen, t· Der Elektromagnet übt eine starke Bremswirkung auf die Eisenscheibe aus und der Kinematograph bleibt, da er mit seinem Motor ja nur durch Reibung gekuppelt ist, hinter diesem und damit auch hinter der Sprechmaschine zurück. Hierdurch werden die beiden Teile der genannten Schaltvorrichtung so gegenein-. ander verdreht, daß der Strom wieder unter-It is known that two apparatuses operated by electric motors operate synchronously To get gear that one amplifies the current in the motor of the too slow running 5 or that of running too quickly weakens him. It is also known to run too quickly running to brake through friction. These regulating devices, which immediately Act on the relatively sluggish engine, now not allow the braking in faster time sequence on and off. It can happen so easily that braking takes longer than until the point in time when both devices have caught up with each other, so that in this case the initially leading apparatus now remains behind. This is special where it is a problem, cinematographs and speaking machines against each other to vote. Since it is less necessary here that both apparatuses in each small one Time interval have exactly the same number of tours, rather that no permanent shift of the associated phases of both apparatuses occurs, the regulation can be carried out in such a way that one, and specifically the cinematograph, with a motor for the synchronous one Both sets are running too high a number of revolutions. As well as this apparatus now by one a certain small amount has advanced, a brake acts on him until this advance is canceled, then the braking is switched off, he is allowed to go again to run with a larger number of revolutions until a lead has occurred again, whereupon the game repeats itself. If you would now brake directly on the engine let it take effect, the individual braking operations could not follow each other sufficiently quickly, because every braking, begins and ends with a slight delay, and this delay is below Incidentally, under the same circumstances, the greater the moment of inertia of the moving is to be braked masses. Therefore, the braking is only left to its full strength the relatively light cinematograph act while they are on the after all transfers much heavier motor armature to a very small extent. To that end is the motor anchor ?, with the. Cinematograph not rigid, but connected by one of the known friction clutches, and on the The axis of the cinematograph is an iron disk that is in front of an electromagnet turns. Partly with the cinematograph, partly with the speaking machine rigidly connected switching device is now, as well as the first of the two apparatus to one a certain amount is advanced, in the electromagnet the current is closed, t · The Electromagnet exerts a strong braking effect on the iron disk and the cinematograph remains, since it is only coupled to its engine by friction, behind it and thus also behind the speaking machine. This will make the two parts the said switching device so against one another. other twisted so that the current falls again

Claims

is broken. Since the braking process runs very quickly, the drive motor of the cinematograph is only. very little energy is withdrawn, so that it continues to run with almost the same number of revolutions, i.e. it can immediately give the cinematograph the required high number of revolutions again. If both parts were inevitably coupled to one another, a much larger amount of energy would have to be braked away before the cinematograph would have lagged behind by the same amount, which with the means available here could not be done in as short a time as with a friction clutch is possible. In the drawing, g represents the pulley of a line, which receives its drive from the motor, not shown; f is the spring of a friction clutch, d and c the apparatus to be controlled, in this case the cinematograph, on whose axis b the iron disk α sits, which rotates in front of the legs of the electromagnet h, k, I, m represent the switching device. k and I are two metal disks, of which the first is inevitably connected to any axis of the cinematograph and the second is also inevitably connected to a slightly slower axis of the speaking machine. Both disks are conductively connected to the power source i and the electromagnet h. The side of the disk I facing the disk k is partially covered by an insulator. A contact strip m which touches k is attached to the disk k. In order to oversee the movement processes which coordinate the operation of the two apparatuses against one another, it is assumed that at a certain point in time both motors run without braking and that the spring m touches an insulator part of the disk I. The drive motor of the cinematograph now moves at a speed that is greater than the speed required for synchronous gear, so that the cinematograph leads. As soon as this advance has reached a certain amount, the spring m of the disk I reaches a contact piece of the disk k, whereby the current is closed and the electrical braking is excited, which then brakes the rotating disk α or the cinematograph c, so that he is held back. . As soon as the cinematograph is held back so far that the spring m steps back on the insulator piece, the braking current is interrupted and the cinematograph begins to advance again. With a suitable choice of the drive speeds of both motors, the spring m will automatically move back and forth on the disk I between two positions that are a little on this side and on the other side of the boundary between a certain conductor and insulator piece. The two disks will therefore always remain in almost the same position with respect to one another and consequently the mutually associated phases of both apparatuses will always occur at the same time. The present brake requires only a very small amount of force and has almost no spark. Ρλ τ ε ν τ - A ν s ρ r ü c η ε:

1. Procedure for synchronizing the running of cinematographs and speaking machines, which are operated at different speeds, characterized in that the too fast running Apparatus with the drive motor. connected by a friction clutch and, as well as it has advanced by a certain amount, automatically braked magnetically in rapid succession, and then is released again.

2. Apparatus for carrying out the method according to claim 1, characterized by two disks (I, k) through which the electrical current of a power source flows and

, which are inevitably connected to one of the apparatuses, one (k) being provided with insulating pieces, on which the contact spring fm) of the other disc (I) stands when the apparatus to be controlled is in advance of the isolated one when running synchronously to enter a contact field, so that the current for the brake is closed.

1 sheet of drawings.

"Berlin. 'CEüiiudkT IN THE iimcitSDiUjCKEKEt.