DE1251974B

DE1251974B -

Info

Publication number: DE1251974B
Application number: DENDAT1251974D
Authority: DE
Publication date: 1967-10-12

Description

DEUTSCHES JfflWWl· PATENTAMTGERMAN JfflWWl PATENT OFFICE

AUSLEGESCHRIFTEDITORIAL

Deutsche Kl.: 42 h - 23/22 German class: 42 h - 23/22

Nummer: 1 251 974Number: 1 251 974

Aktenzeichen: E 29408 IX a/42 hFile number: E 29408 IX a / 42 h

1251 9T4 Anmeldetag: 29. Mai 19651251 9T4 filing date: May 29, 1965

Auslegetag: 12. Oktober 1967Open date: October 12, 1967

Die Erfindung betrifft einen elektromechanischen Zeitschalter für Stehbildwerfer, mit dem der Rhythmus des Bildwechsels wahlweise einstellbar· ist, um insbesondere bei längeren Diavorträgen dem Vortragenden die Vorführung zu erleichtern.The invention relates to an electromechanical time switch for still projector, with which the rhythm of the picture change can be set optionally, in order to benefit the presenter, especially in the case of longer slide presentations to facilitate the demonstration.

Es wurden bereits Einrichtungen dieser Art bekannt, bei denen auf einem kontinuierlich umlaufenden Schaltrad Kontaktbahnen mit unterschiedlichem Radius bzw. Nocken angeordnet sind, in deren Durchgangsbereich zwecks Einstellung verschiedener Schaltzeiten mittels einer an dem Projektor angeordneten Handhabe ein Schaltkontakt schwenkbar ist, über den der Stromkreis für den Diawechselmechanismus zu schließen ist. An Stelle dieser und ähnlicher elektromechanischer Einrichtungen wurden auch Arbeitstaktsteuerungen bekannt, bei denen die verschiedenen Bildwechselzeiten durch einen Bimetallschalter gesteuert werden.There are already facilities of this type known in which on a continuously revolving Ratchet wheel contact tracks with different radii or cams are arranged in their passage area for the purpose of setting different switching times by means of an arranged on the projector Handle a switching contact can be pivoted, via which the circuit for the slide changing mechanism is to close. Instead of this and similar electromechanical devices also known work cycle controls in which the various picture change times by a bimetal switch being controlled.

Die Nachteile dieser in mehreren Varianten bekanntgewordenen Zeitschalter bestehen darin, daß sie entweder relativ teuer sind oder einen hohen Raumbedarf bedingen, der bei Kleingeräten wie Stehbildwerfern von besonderer Bedeutung ist bzw. daß die Schaltzeitintervalle nur unmittelbar an dem Bildwerfer einstellbar sind.The disadvantages of this time switch, which has become known in several variants, is that they are either relatively expensive or require a lot of space, which is the case with small devices such as free-standing projectors It is of particular importance that the switching time intervals only occur directly on the projector are adjustable.

Aufgabe der Erfindung ist es, einen elektromechanischen Zeitschalter für Stehbildwerfer zu schaffen, welcher mit minimalem Platzbedarf und nur geringer Verteuerung des Projektors in diesen einbaubar und dennoch fernbedienbar auf unterschiedliche Schaltzeiten einstellbar ist.The object of the invention is to create an electromechanical time switch for still projector, which with minimal space requirements and only a small increase in the cost of the projector can be installed in this and can still be set remotely to different switching times.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß auf einem mit konstanter Geschwindigkeit umlaufenden Träger ein Kontaktstück angeordnet ist, das als Überbrückungsglied für Kontaktstellen fungiert, die in festen Abständen zueinander auf dem Projektorchassis angeordnet, in einer in dem Fernbedienungsteil für den Bildwerfer befindlichen Kontaktbrücke leitungsgebunden zusammengeführt und über die Kontaktbrücke wahlweise in den Stromkreis für den Diawechselmechanismus einbeziehbar sind. Vorzugsweise kann der Träger für das Kontaktstück als Guirimischnur ausgebildet sein, die entsprechend dem im Projektor noch freien Raum verlegbar ist. Zwecks wahlweiser Einbeziehung der Kontaktstellen in den Stromkreis des Diawechselmechanismus ist die Kontaktbrücke als Schleppschalter ausgebildet, so daß sich eine einfache feinsteuerbare Zeilenumschaltung ergibt.According to the invention this object is achieved in that at a constant speed A contact piece is arranged around the circumferential carrier, which acts as a bridging element for contact points, which are arranged at fixed distances from one another on the projector chassis, in one in the remote control part for the projector located contact bridge brought together and wired can optionally be included in the circuit for the slide changing mechanism via the contact bridge. The carrier for the contact piece can preferably be designed as a Guirimi cord, which accordingly which can still be laid in free space in the projector. For the optional inclusion of the contact points In the circuit of the slide changing mechanism, the contact bridge is designed as a drag switch, see above that a simple, finely controllable line shift results.

Die Erfindung wird an Hand dargestellter Ausführungsbeispiele nachstehend näher erläutert. Es zeigtThe invention is explained in more detail below with reference to exemplary embodiments shown. It shows

Elektromechanischer Zeitschalter für
StehbildwerferElectromechanical timer for
Still projector

Anmelder:Applicant:

Elbe-Kamera-Gesellschaft
mit beschränkter Haftung,
Dresden A 16, Blasewitzer Str. 45Elbe Camera Society
with limited liability,
Dresden A 16, Blasewitzer Str. 45

Als Erfinder benannt:
Walter Groß, DresdenNamed as inventor:
Walter Gross, Dresden

F i g. 1 Prinzipdarstellung des Erfindungsgegenstandes, F i g. 1 outline of the subject matter of the invention,

F i g. 2 konstruktive Ausführungsform mit gestreckter Gummischnur,F i g. 2 constructive embodiment with stretched rubber cord,

F i g. 3 Draufsicht zu F i g. 2,F i g. 3 top view of FIG. 2,

F i g. 4 abgewinkelte Verlegung des kontaktträger, F i g. 5 Schnurführung bei minimalstem Raumbedarf. F i g. 4 angled laying of the contact carrier, F i g. 5 Line guidance with minimal space requirements.

Gemäß Fig. 1 ist auf einer mit konstanter Geschwindigkeit von dem Projektormotor angetriebenen Gummischnur 1 als Kontaktstück eine Kontaktöse 2 befestigt, welche bei jedem Umlauf über Schnurlaufrollen 3, 4 zwischen Kontaktstiften 5, 6 und Federkontakten 7, 8, 9 und 10 dieselben elektrisch überbrückend entlanggeführt wird. Die in der dargestellten Weise zusammengeschalteten Kontaktstellen sind über Leitungen 11,12,13 in einer in dieser Ausführungsform als Schleppschalter 14 ausgebildeten und im Fernbedienungsteil des Stehbildwerfers angeordneten Kontaktbrücke zusammengeführt und mit einem den Diawechsel einleitenden Elektromagneten oder elektromagnetischer Kupplung 15 wahlweise verbindbar, so daß bei entsprechender Stellung der Kontaktöse 2 der Stromkreis für die Spannungsquelle 16 geschlossen ist.According to Fig. 1, a contact eyelet 2 is attached to a rubber cord 1 driven at constant speed by the projector motor as a contact piece, which leads along the same electrically bridging with each revolution over cord rollers 3, 4 between contact pins 5, 6 and spring contacts 7, 8, 9 and 10 will. The contact points interconnected in the manner shown are brought together via lines 11, 12, 13 in a contact bridge designed in this embodiment as a drag switch 14 and arranged in the remote control part of the still projector and optionally connectable to an electromagnet or electromagnetic clutch 15 that initiates the slide change, so that when appropriate Position of the contact lug 2, the circuit for the voltage source 16 is closed.

In F i g. 2 und 3 ist eine Ausführungsform des mechanischen Teiles des Zeitschalters dargestellt. Der Antrieb der Gummischnur 1 erfolgt über ein auf der Welle 17 der SchnuiIaufiOlle 4 angeordnetes Laufrad 18, das mit einer Welle geringster Drehzahl des Stehbildwerfers, z. B. mittels einer Peese 19, in Verbindung steht. Die Kontaktstifte 5, 6 sind auf dem geerdeten Projektorchassis 23 unisoliert gegenüber diesem angeordnet. Dies ist dadurch möglich, daß gleichzeitig die Nullseite der Sekundärwicklung des im Projektor verwendeten Niederspan nungstransfor-In Fig. 2 and 3 an embodiment of the mechanical part of the timer is shown. The rubber cord 1 is driven via an impeller 18 which is arranged on the shaft 17 of the SchnuiIaufiOlle 4. B. by means of a Peese 19, in connection. The contact pins 5, 6 are arranged on the grounded projector chassis 23 without being isolated from the latter. This is possible because at the same time the zero side of the secondary winding of the low-voltage transformer used in the projector

709 677/172709 677/172

Claims

mators is connected to ground. In this way, the assembly and the wiring of the illustrated time switch is simplified. An embodiment in which the rubber cord was arranged at an angle for reasons of space is shown in FIG. 4 shown. Two deflection rollers 20 arranged one below the other appear as new components compared to the previous representations, which are loosely rotatably arranged on the shaft 21. Only the upper one can be seen in the drawing. In Fig. 5 shows another space-saving embodiment of the mechanical part of the time switch according to the invention. The cord wheels 3 and 4 are arranged on a common shaft 22 in such a way that the drive cord wheel 4 is firmly pinned to the driven shaft 22 and the cord wheel 3 is freely rotatable. Such an arrangement is possible due to the extremely low speed of the shaft 22. Here, too, the two deflection rollers 20 are again arranged one below the other on a common shaft 21. Of the four spring contacts, only the spring contacts 7 and 9 can be seen in the drawing, since these too, as in FIG. 2 and 4 are below each other. The mode of operation of the timer is illustrated below with reference to FIG. 1 explains: The cord 1, driven at constant speed, guides the contact eyelet 2 past the four contact points during one complete cycle, which corresponds to the greatest possible switching time, and connects the contact pins 5, 6 with the spring contacts 7, 8, 9 and 10. The freely selectable position of the drag switch 14 now depends on the time intervals in which the circuit of the voltage source 16 is closed and thus the electromagnet or the like 15 that initiates the slide change is fed. If the tow switch 14 is connected, for example, to the line 13, only the spring contact 8 is effective for switching, ie. That is, the electromagnet 15 is only fed when it is bridged with the contact pin 6. All other contact points remain ineffective for the slide change. In this way, the longest possible switching time interval of 60 seconds, for example, is set. With this switch position, the slide change would be initiated automatically every minute. If the tow switch 14 makes the connection to the line 11, the above-mentioned switching time interval is halved, because now the spring contacts 7 and 10 are activated. When all lines 11, 12 and 13 are bridged, the switching time is halved again, so that in this case a slide change takes place every 15 seconds. If the drag switch 14 does not connect any of the designated lines, then all bridges of the contact piece 2 remain ineffective, and the slide change can be initiated manually via the switch 22. The switching times can therefore be selected without any mechanical adjustments having to be made on the projector as before. At the same time, the described mechanism can be installed in the smallest of spaces in the projector. This is particularly advantageous when this time switch is to be retrofitted to the projector. Patent claims:

1. Electromechanical time switch for still projector, with the help of which the circuit of the slide changing mechanism can be periodically closed in preselectable time intervals, characterized in that a contact piece (2) is arranged on a carrier (1) rotating at constant speed, which acts as a bridging element for contact points (6 , 7, 8; 5, 9, 10) acts, which are arranged at fixed distances from each other on the projector chassis (23), merged into one located in the remote controller for the projectors contact bridge (14) by wire and via the contact bridge (14) optionally, can be included in the circuit for the slide changing mechanism.

2. Time switch according to claim 1, characterized in that the carrier rotating at constant speed is designed as a rubber cord (1) which can be relocated according to the free space in the projector.

3. Time switch according to claim 1, characterized in that the contact pins (5; 6) of the contact points are in direct electrically conductive connection with the grounded projector chassis (23) .

4. Time switch according to claim 1, characterized in that it is easily replaceable Unit is formed.

5. Time switch according to claim 1, characterized in that the contact bridge in the remote control part of the projector is designed in the form of a drag switch (14).

6. Time switch according to claim 1, characterized in that the time switch in its function can be switched off and the slide change must be initiated manually.

1 sheet of drawings